The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpi.c

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    1 /*-
    2  * Copyright (c) 2000 Takanori Watanabe <takawata@jp.freebsd.org>
    3  * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@jp.freebsd.org>
    4  * Copyright (c) 2000, 2001 Michael Smith
    5  * Copyright (c) 2000 BSDi
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   32 
   33 #include "opt_acpi.h"
   34 #include <sys/param.h>
   35 #include <sys/kernel.h>
   36 #include <sys/proc.h>
   37 #include <sys/fcntl.h>
   38 #include <sys/malloc.h>
   39 #include <sys/module.h>
   40 #include <sys/bus.h>
   41 #include <sys/conf.h>
   42 #include <sys/ioccom.h>
   43 #include <sys/reboot.h>
   44 #include <sys/sysctl.h>
   45 #include <sys/ctype.h>
   46 #include <sys/linker.h>
   47 #include <sys/power.h>
   48 #include <sys/sbuf.h>
   49 #include <sys/sched.h>
   50 #include <sys/smp.h>
   51 #include <sys/timetc.h>
   52 
   53 #if defined(__i386__) || defined(__amd64__)
   54 #include <machine/pci_cfgreg.h>
   55 #endif
   56 #include <machine/resource.h>
   57 #include <machine/bus.h>
   58 #include <sys/rman.h>
   59 #include <isa/isavar.h>
   60 #include <isa/pnpvar.h>
   61 
   62 #include <contrib/dev/acpica/include/acpi.h>
   63 #include <contrib/dev/acpica/include/accommon.h>
   64 #include <contrib/dev/acpica/include/acnamesp.h>
   65 
   66 #include <dev/acpica/acpivar.h>
   67 #include <dev/acpica/acpiio.h>
   68 
   69 #include <vm/vm_param.h>
   70 
   71 static MALLOC_DEFINE(M_ACPIDEV, "acpidev", "ACPI devices");
   72 
   73 /* Hooks for the ACPI CA debugging infrastructure */
   74 #define _COMPONENT      ACPI_BUS
   75 ACPI_MODULE_NAME("ACPI")
   76 
   77 static d_open_t         acpiopen;
   78 static d_close_t        acpiclose;
   79 static d_ioctl_t        acpiioctl;
   80 
   81 static struct cdevsw acpi_cdevsw = {
   82         .d_version =    D_VERSION,
   83         .d_open =       acpiopen,
   84         .d_close =      acpiclose,
   85         .d_ioctl =      acpiioctl,
   86         .d_name =       "acpi",
   87 };
   88 
   89 struct acpi_interface {
   90         ACPI_STRING     *data;
   91         int             num;
   92 };
   93 
   94 /* Global mutex for locking access to the ACPI subsystem. */
   95 struct mtx      acpi_mutex;
   96 
   97 /* Bitmap of device quirks. */
   98 int             acpi_quirks;
   99 
  100 /* Supported sleep states. */
  101 static BOOLEAN  acpi_sleep_states[ACPI_S_STATE_COUNT];
  102 
  103 static void     acpi_lookup(void *arg, const char *name, device_t *dev);
  104 static int      acpi_modevent(struct module *mod, int event, void *junk);
  105 static int      acpi_probe(device_t dev);
  106 static int      acpi_attach(device_t dev);
  107 static int      acpi_suspend(device_t dev);
  108 static int      acpi_resume(device_t dev);
  109 static int      acpi_shutdown(device_t dev);
  110 static device_t acpi_add_child(device_t bus, u_int order, const char *name,
  111                         int unit);
  112 static int      acpi_print_child(device_t bus, device_t child);
  113 static void     acpi_probe_nomatch(device_t bus, device_t child);
  114 static void     acpi_driver_added(device_t dev, driver_t *driver);
  115 static int      acpi_read_ivar(device_t dev, device_t child, int index,
  116                         uintptr_t *result);
  117 static int      acpi_write_ivar(device_t dev, device_t child, int index,
  118                         uintptr_t value);
  119 static struct resource_list *acpi_get_rlist(device_t dev, device_t child);
  120 static void     acpi_reserve_resources(device_t dev);
  121 static int      acpi_sysres_alloc(device_t dev);
  122 static int      acpi_set_resource(device_t dev, device_t child, int type,
  123                         int rid, u_long start, u_long count);
  124 static struct resource *acpi_alloc_resource(device_t bus, device_t child,
  125                         int type, int *rid, u_long start, u_long end,
  126                         u_long count, u_int flags);
  127 static int      acpi_adjust_resource(device_t bus, device_t child, int type,
  128                         struct resource *r, u_long start, u_long end);
  129 static int      acpi_release_resource(device_t bus, device_t child, int type,
  130                         int rid, struct resource *r);
  131 static void     acpi_delete_resource(device_t bus, device_t child, int type,
  132                     int rid);
  133 static uint32_t acpi_isa_get_logicalid(device_t dev);
  134 static int      acpi_isa_get_compatid(device_t dev, uint32_t *cids, int count);
  135 static char     *acpi_device_id_probe(device_t bus, device_t dev, char **ids);
  136 static ACPI_STATUS acpi_device_eval_obj(device_t bus, device_t dev,
  137                     ACPI_STRING pathname, ACPI_OBJECT_LIST *parameters,
  138                     ACPI_BUFFER *ret);
  139 static ACPI_STATUS acpi_device_scan_cb(ACPI_HANDLE h, UINT32 level,
  140                     void *context, void **retval);
  141 static ACPI_STATUS acpi_device_scan_children(device_t bus, device_t dev,
  142                     int max_depth, acpi_scan_cb_t user_fn, void *arg);
  143 static int      acpi_set_powerstate(device_t child, int state);
  144 static int      acpi_isa_pnp_probe(device_t bus, device_t child,
  145                     struct isa_pnp_id *ids);
  146 static void     acpi_probe_children(device_t bus);
  147 static void     acpi_probe_order(ACPI_HANDLE handle, int *order);
  148 static ACPI_STATUS acpi_probe_child(ACPI_HANDLE handle, UINT32 level,
  149                     void *context, void **status);
  150 static void     acpi_sleep_enable(void *arg);
  151 static ACPI_STATUS acpi_sleep_disable(struct acpi_softc *sc);
  152 static ACPI_STATUS acpi_EnterSleepState(struct acpi_softc *sc, int state);
  153 static void     acpi_shutdown_final(void *arg, int howto);
  154 static void     acpi_enable_fixed_events(struct acpi_softc *sc);
  155 static BOOLEAN  acpi_has_hid(ACPI_HANDLE handle);
  156 static void     acpi_resync_clock(struct acpi_softc *sc);
  157 static int      acpi_wake_sleep_prep(ACPI_HANDLE handle, int sstate);
  158 static int      acpi_wake_run_prep(ACPI_HANDLE handle, int sstate);
  159 static int      acpi_wake_prep_walk(int sstate);
  160 static int      acpi_wake_sysctl_walk(device_t dev);
  161 static int      acpi_wake_set_sysctl(SYSCTL_HANDLER_ARGS);
  162 static void     acpi_system_eventhandler_sleep(void *arg, int state);
  163 static void     acpi_system_eventhandler_wakeup(void *arg, int state);
  164 static int      acpi_sname2sstate(const char *sname);
  165 static const char *acpi_sstate2sname(int sstate);
  166 static int      acpi_supported_sleep_state_sysctl(SYSCTL_HANDLER_ARGS);
  167 static int      acpi_sleep_state_sysctl(SYSCTL_HANDLER_ARGS);
  168 static int      acpi_debug_objects_sysctl(SYSCTL_HANDLER_ARGS);
  169 static int      acpi_pm_func(u_long cmd, void *arg, ...);
  170 static int      acpi_child_location_str_method(device_t acdev, device_t child,
  171                                                char *buf, size_t buflen);
  172 static int      acpi_child_pnpinfo_str_method(device_t acdev, device_t child,
  173                                               char *buf, size_t buflen);
  174 #if defined(__i386__) || defined(__amd64__)
  175 static void     acpi_enable_pcie(void);
  176 #endif
  177 static void     acpi_hint_device_unit(device_t acdev, device_t child,
  178                     const char *name, int *unitp);
  179 static void     acpi_reset_interfaces(device_t dev);
  180 
  181 static device_method_t acpi_methods[] = {
  182     /* Device interface */
  183     DEVMETHOD(device_probe,             acpi_probe),
  184     DEVMETHOD(device_attach,            acpi_attach),
  185     DEVMETHOD(device_shutdown,          acpi_shutdown),
  186     DEVMETHOD(device_detach,            bus_generic_detach),
  187     DEVMETHOD(device_suspend,           acpi_suspend),
  188     DEVMETHOD(device_resume,            acpi_resume),
  189 
  190     /* Bus interface */
  191     DEVMETHOD(bus_add_child,            acpi_add_child),
  192     DEVMETHOD(bus_print_child,          acpi_print_child),
  193     DEVMETHOD(bus_probe_nomatch,        acpi_probe_nomatch),
  194     DEVMETHOD(bus_driver_added,         acpi_driver_added),
  195     DEVMETHOD(bus_read_ivar,            acpi_read_ivar),
  196     DEVMETHOD(bus_write_ivar,           acpi_write_ivar),
  197     DEVMETHOD(bus_get_resource_list,    acpi_get_rlist),
  198     DEVMETHOD(bus_set_resource,         acpi_set_resource),
  199     DEVMETHOD(bus_get_resource,         bus_generic_rl_get_resource),
  200     DEVMETHOD(bus_alloc_resource,       acpi_alloc_resource),
  201     DEVMETHOD(bus_adjust_resource,      acpi_adjust_resource),
  202     DEVMETHOD(bus_release_resource,     acpi_release_resource),
  203     DEVMETHOD(bus_delete_resource,      acpi_delete_resource),
  204     DEVMETHOD(bus_child_pnpinfo_str,    acpi_child_pnpinfo_str_method),
  205     DEVMETHOD(bus_child_location_str,   acpi_child_location_str_method),
  206     DEVMETHOD(bus_activate_resource,    bus_generic_activate_resource),
  207     DEVMETHOD(bus_deactivate_resource,  bus_generic_deactivate_resource),
  208     DEVMETHOD(bus_setup_intr,           bus_generic_setup_intr),
  209     DEVMETHOD(bus_teardown_intr,        bus_generic_teardown_intr),
  210     DEVMETHOD(bus_hint_device_unit,     acpi_hint_device_unit),
  211     DEVMETHOD(bus_get_domain,           acpi_get_domain),
  212 
  213     /* ACPI bus */
  214     DEVMETHOD(acpi_id_probe,            acpi_device_id_probe),
  215     DEVMETHOD(acpi_evaluate_object,     acpi_device_eval_obj),
  216     DEVMETHOD(acpi_pwr_for_sleep,       acpi_device_pwr_for_sleep),
  217     DEVMETHOD(acpi_scan_children,       acpi_device_scan_children),
  218 
  219     /* ISA emulation */
  220     DEVMETHOD(isa_pnp_probe,            acpi_isa_pnp_probe),
  221 
  222     DEVMETHOD_END
  223 };
  224 
  225 static driver_t acpi_driver = {
  226     "acpi",
  227     acpi_methods,
  228     sizeof(struct acpi_softc),
  229 };
  230 
  231 static devclass_t acpi_devclass;
  232 DRIVER_MODULE(acpi, nexus, acpi_driver, acpi_devclass, acpi_modevent, 0);
  233 MODULE_VERSION(acpi, 1);
  234 
  235 ACPI_SERIAL_DECL(acpi, "ACPI root bus");
  236 
  237 /* Local pools for managing system resources for ACPI child devices. */
  238 static struct rman acpi_rman_io, acpi_rman_mem;
  239 
  240 #define ACPI_MINIMUM_AWAKETIME  5
  241 
  242 /* Holds the description of the acpi0 device. */
  243 static char acpi_desc[ACPI_OEM_ID_SIZE + ACPI_OEM_TABLE_ID_SIZE + 2];
  244 
  245 SYSCTL_NODE(_debug, OID_AUTO, acpi, CTLFLAG_RD, NULL, "ACPI debugging");
  246 static char acpi_ca_version[12];
  247 SYSCTL_STRING(_debug_acpi, OID_AUTO, acpi_ca_version, CTLFLAG_RD,
  248               acpi_ca_version, 0, "Version of Intel ACPI-CA");
  249 
  250 /*
  251  * Allow overriding _OSI methods.
  252  */
  253 static char acpi_install_interface[256];
  254 TUNABLE_STR("hw.acpi.install_interface", acpi_install_interface,
  255     sizeof(acpi_install_interface));
  256 static char acpi_remove_interface[256];
  257 TUNABLE_STR("hw.acpi.remove_interface", acpi_remove_interface,
  258     sizeof(acpi_remove_interface));
  259 
  260 /* Allow users to dump Debug objects without ACPI debugger. */
  261 static int acpi_debug_objects;
  262 TUNABLE_INT("debug.acpi.enable_debug_objects", &acpi_debug_objects);
  263 SYSCTL_PROC(_debug_acpi, OID_AUTO, enable_debug_objects,
  264     CTLFLAG_RW | CTLTYPE_INT, NULL, 0, acpi_debug_objects_sysctl, "I",
  265     "Enable Debug objects");
  266 
  267 /* Allow the interpreter to ignore common mistakes in BIOS. */
  268 static int acpi_interpreter_slack = 1;
  269 TUNABLE_INT("debug.acpi.interpreter_slack", &acpi_interpreter_slack);
  270 SYSCTL_INT(_debug_acpi, OID_AUTO, interpreter_slack, CTLFLAG_RDTUN,
  271     &acpi_interpreter_slack, 1, "Turn on interpreter slack mode.");
  272 
  273 /* Ignore register widths set by FADT and use default widths instead. */
  274 static int acpi_ignore_reg_width = 1;
  275 TUNABLE_INT("debug.acpi.default_register_width", &acpi_ignore_reg_width);
  276 SYSCTL_INT(_debug_acpi, OID_AUTO, default_register_width, CTLFLAG_RDTUN,
  277     &acpi_ignore_reg_width, 1, "Ignore register widths set by FADT");
  278 
  279 #ifdef __amd64__
  280 /* Reset system clock while resuming.  XXX Remove once tested. */
  281 static int acpi_reset_clock = 1;
  282 TUNABLE_INT("debug.acpi.reset_clock", &acpi_reset_clock);
  283 SYSCTL_INT(_debug_acpi, OID_AUTO, reset_clock, CTLFLAG_RW,
  284     &acpi_reset_clock, 1, "Reset system clock while resuming.");
  285 #endif
  286 
  287 /* Allow users to override quirks. */
  288 TUNABLE_INT("debug.acpi.quirks", &acpi_quirks);
  289 
  290 static int acpi_susp_bounce;
  291 SYSCTL_INT(_debug_acpi, OID_AUTO, suspend_bounce, CTLFLAG_RW,
  292     &acpi_susp_bounce, 0, "Don't actually suspend, just test devices.");
  293 
  294 /*
  295  * ACPI can only be loaded as a module by the loader; activating it after
  296  * system bootstrap time is not useful, and can be fatal to the system.
  297  * It also cannot be unloaded, since the entire system bus hierarchy hangs
  298  * off it.
  299  */
  300 static int
  301 acpi_modevent(struct module *mod, int event, void *junk)
  302 {
  303     switch (event) {
  304     case MOD_LOAD:
  305         if (!cold) {
  306             printf("The ACPI driver cannot be loaded after boot.\n");
  307             return (EPERM);
  308         }
  309         break;
  310     case MOD_UNLOAD:
  311         if (!cold && power_pm_get_type() == POWER_PM_TYPE_ACPI)
  312             return (EBUSY);
  313         break;
  314     default:
  315         break;
  316     }
  317     return (0);
  318 }
  319 
  320 /*
  321  * Perform early initialization.
  322  */
  323 ACPI_STATUS
  324 acpi_Startup(void)
  325 {
  326     static int started = 0;
  327     ACPI_STATUS status;
  328     int val;
  329 
  330     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  331 
  332     /* Only run the startup code once.  The MADT driver also calls this. */
  333     if (started)
  334         return_VALUE (AE_OK);
  335     started = 1;
  336 
  337     /*
  338      * Pre-allocate space for RSDT/XSDT and DSDT tables and allow resizing
  339      * if more tables exist.
  340      */
  341     if (ACPI_FAILURE(status = AcpiInitializeTables(NULL, 2, TRUE))) {
  342         printf("ACPI: Table initialisation failed: %s\n",
  343             AcpiFormatException(status));
  344         return_VALUE (status);
  345     }
  346 
  347     /* Set up any quirks we have for this system. */
  348     if (acpi_quirks == ACPI_Q_OK)
  349         acpi_table_quirks(&acpi_quirks);
  350 
  351     /* If the user manually set the disabled hint to 0, force-enable ACPI. */
  352     if (resource_int_value("acpi", 0, "disabled", &val) == 0 && val == 0)
  353         acpi_quirks &= ~ACPI_Q_BROKEN;
  354     if (acpi_quirks & ACPI_Q_BROKEN) {
  355         printf("ACPI disabled by blacklist.  Contact your BIOS vendor.\n");
  356         status = AE_SUPPORT;
  357     }
  358 
  359     return_VALUE (status);
  360 }
  361 
  362 /*
  363  * Detect ACPI and perform early initialisation.
  364  */
  365 int
  366 acpi_identify(void)
  367 {
  368     ACPI_TABLE_RSDP     *rsdp;
  369     ACPI_TABLE_HEADER   *rsdt;
  370     ACPI_PHYSICAL_ADDRESS paddr;
  371     struct sbuf         sb;
  372 
  373     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  374 
  375     if (!cold)
  376         return (ENXIO);
  377 
  378     /* Check that we haven't been disabled with a hint. */
  379     if (resource_disabled("acpi", 0))
  380         return (ENXIO);
  381 
  382     /* Check for other PM systems. */
  383     if (power_pm_get_type() != POWER_PM_TYPE_NONE &&
  384         power_pm_get_type() != POWER_PM_TYPE_ACPI) {
  385         printf("ACPI identify failed, other PM system enabled.\n");
  386         return (ENXIO);
  387     }
  388 
  389     /* Initialize root tables. */
  390     if (ACPI_FAILURE(acpi_Startup())) {
  391         printf("ACPI: Try disabling either ACPI or apic support.\n");
  392         return (ENXIO);
  393     }
  394 
  395     if ((paddr = AcpiOsGetRootPointer()) == 0 ||
  396         (rsdp = AcpiOsMapMemory(paddr, sizeof(ACPI_TABLE_RSDP))) == NULL)
  397         return (ENXIO);
  398     if (rsdp->Revision > 1 && rsdp->XsdtPhysicalAddress != 0)
  399         paddr = (ACPI_PHYSICAL_ADDRESS)rsdp->XsdtPhysicalAddress;
  400     else
  401         paddr = (ACPI_PHYSICAL_ADDRESS)rsdp->RsdtPhysicalAddress;
  402     AcpiOsUnmapMemory(rsdp, sizeof(ACPI_TABLE_RSDP));
  403 
  404     if ((rsdt = AcpiOsMapMemory(paddr, sizeof(ACPI_TABLE_HEADER))) == NULL)
  405         return (ENXIO);
  406     sbuf_new(&sb, acpi_desc, sizeof(acpi_desc), SBUF_FIXEDLEN);
  407     sbuf_bcat(&sb, rsdt->OemId, ACPI_OEM_ID_SIZE);
  408     sbuf_trim(&sb);
  409     sbuf_putc(&sb, ' ');
  410     sbuf_bcat(&sb, rsdt->OemTableId, ACPI_OEM_TABLE_ID_SIZE);
  411     sbuf_trim(&sb);
  412     sbuf_finish(&sb);
  413     sbuf_delete(&sb);
  414     AcpiOsUnmapMemory(rsdt, sizeof(ACPI_TABLE_HEADER));
  415 
  416     snprintf(acpi_ca_version, sizeof(acpi_ca_version), "%x", ACPI_CA_VERSION);
  417 
  418     return (0);
  419 }
  420 
  421 /*
  422  * Fetch some descriptive data from ACPI to put in our attach message.
  423  */
  424 static int
  425 acpi_probe(device_t dev)
  426 {
  427 
  428     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  429 
  430     device_set_desc(dev, acpi_desc);
  431 
  432     return_VALUE (BUS_PROBE_NOWILDCARD);
  433 }
  434 
  435 static int
  436 acpi_attach(device_t dev)
  437 {
  438     struct acpi_softc   *sc;
  439     ACPI_STATUS         status;
  440     int                 error, state;
  441     UINT32              flags;
  442     UINT8               TypeA, TypeB;
  443     char                *env;
  444 
  445     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  446 
  447     sc = device_get_softc(dev);
  448     sc->acpi_dev = dev;
  449     callout_init(&sc->susp_force_to, TRUE);
  450 
  451     error = ENXIO;
  452 
  453     /* Initialize resource manager. */
  454     acpi_rman_io.rm_type = RMAN_ARRAY;
  455     acpi_rman_io.rm_start = 0;
  456     acpi_rman_io.rm_end = 0xffff;
  457     acpi_rman_io.rm_descr = "ACPI I/O ports";
  458     if (rman_init(&acpi_rman_io) != 0)
  459         panic("acpi rman_init IO ports failed");
  460     acpi_rman_mem.rm_type = RMAN_ARRAY;
  461     acpi_rman_mem.rm_start = 0;
  462     acpi_rman_mem.rm_end = ~0ul;
  463     acpi_rman_mem.rm_descr = "ACPI I/O memory addresses";
  464     if (rman_init(&acpi_rman_mem) != 0)
  465         panic("acpi rman_init memory failed");
  466 
  467     /* Initialise the ACPI mutex */
  468     mtx_init(&acpi_mutex, "ACPI global lock", NULL, MTX_DEF);
  469 
  470     /*
  471      * Set the globals from our tunables.  This is needed because ACPI-CA
  472      * uses UINT8 for some values and we have no tunable_byte.
  473      */
  474     AcpiGbl_EnableInterpreterSlack = acpi_interpreter_slack ? TRUE : FALSE;
  475     AcpiGbl_EnableAmlDebugObject = acpi_debug_objects ? TRUE : FALSE;
  476     AcpiGbl_UseDefaultRegisterWidths = acpi_ignore_reg_width ? TRUE : FALSE;
  477 
  478 #ifndef ACPI_DEBUG
  479     /*
  480      * Disable all debugging layers and levels.
  481      */
  482     AcpiDbgLayer = 0;
  483     AcpiDbgLevel = 0;
  484 #endif
  485 
  486     /* Start up the ACPI CA subsystem. */
  487     status = AcpiInitializeSubsystem();
  488     if (ACPI_FAILURE(status)) {
  489         device_printf(dev, "Could not initialize Subsystem: %s\n",
  490                       AcpiFormatException(status));
  491         goto out;
  492     }
  493 
  494     /* Override OS interfaces if the user requested. */
  495     acpi_reset_interfaces(dev);
  496 
  497     /* Load ACPI name space. */
  498     status = AcpiLoadTables();
  499     if (ACPI_FAILURE(status)) {
  500         device_printf(dev, "Could not load Namespace: %s\n",
  501                       AcpiFormatException(status));
  502         goto out;
  503     }
  504 
  505 #if defined(__i386__) || defined(__amd64__)
  506     /* Handle MCFG table if present. */
  507     acpi_enable_pcie();
  508 #endif
  509 
  510     /*
  511      * Note that some systems (specifically, those with namespace evaluation
  512      * issues that require the avoidance of parts of the namespace) must
  513      * avoid running _INI and _STA on everything, as well as dodging the final
  514      * object init pass.
  515      *
  516      * For these devices, we set ACPI_NO_DEVICE_INIT and ACPI_NO_OBJECT_INIT).
  517      *
  518      * XXX We should arrange for the object init pass after we have attached
  519      *     all our child devices, but on many systems it works here.
  520      */
  521     flags = 0;
  522     if (testenv("debug.acpi.avoid"))
  523         flags = ACPI_NO_DEVICE_INIT | ACPI_NO_OBJECT_INIT;
  524 
  525     /* Bring the hardware and basic handlers online. */
  526     if (ACPI_FAILURE(status = AcpiEnableSubsystem(flags))) {
  527         device_printf(dev, "Could not enable ACPI: %s\n",
  528                       AcpiFormatException(status));
  529         goto out;
  530     }
  531 
  532     /*
  533      * Call the ECDT probe function to provide EC functionality before
  534      * the namespace has been evaluated.
  535      *
  536      * XXX This happens before the sysresource devices have been probed and
  537      * attached so its resources come from nexus0.  In practice, this isn't
  538      * a problem but should be addressed eventually.
  539      */
  540     acpi_ec_ecdt_probe(dev);
  541 
  542     /* Bring device objects and regions online. */
  543     if (ACPI_FAILURE(status = AcpiInitializeObjects(flags))) {
  544         device_printf(dev, "Could not initialize ACPI objects: %s\n",
  545                       AcpiFormatException(status));
  546         goto out;
  547     }
  548 
  549     /*
  550      * Setup our sysctl tree.
  551      *
  552      * XXX: This doesn't check to make sure that none of these fail.
  553      */
  554     sysctl_ctx_init(&sc->acpi_sysctl_ctx);
  555     sc->acpi_sysctl_tree = SYSCTL_ADD_NODE(&sc->acpi_sysctl_ctx,
  556                                SYSCTL_STATIC_CHILDREN(_hw), OID_AUTO,
  557                                device_get_name(dev), CTLFLAG_RD, 0, "");
  558     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  559         OID_AUTO, "supported_sleep_state", CTLTYPE_STRING | CTLFLAG_RD,
  560         0, 0, acpi_supported_sleep_state_sysctl, "A", "");
  561     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  562         OID_AUTO, "power_button_state", CTLTYPE_STRING | CTLFLAG_RW,
  563         &sc->acpi_power_button_sx, 0, acpi_sleep_state_sysctl, "A", "");
  564     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  565         OID_AUTO, "sleep_button_state", CTLTYPE_STRING | CTLFLAG_RW,
  566         &sc->acpi_sleep_button_sx, 0, acpi_sleep_state_sysctl, "A", "");
  567     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  568         OID_AUTO, "lid_switch_state", CTLTYPE_STRING | CTLFLAG_RW,
  569         &sc->acpi_lid_switch_sx, 0, acpi_sleep_state_sysctl, "A", "");
  570     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  571         OID_AUTO, "standby_state", CTLTYPE_STRING | CTLFLAG_RW,
  572         &sc->acpi_standby_sx, 0, acpi_sleep_state_sysctl, "A", "");
  573     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  574         OID_AUTO, "suspend_state", CTLTYPE_STRING | CTLFLAG_RW,
  575         &sc->acpi_suspend_sx, 0, acpi_sleep_state_sysctl, "A", "");
  576     SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  577         OID_AUTO, "sleep_delay", CTLFLAG_RW, &sc->acpi_sleep_delay, 0,
  578         "sleep delay in seconds");
  579     SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  580         OID_AUTO, "s4bios", CTLFLAG_RW, &sc->acpi_s4bios, 0, "S4BIOS mode");
  581     SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  582         OID_AUTO, "verbose", CTLFLAG_RW, &sc->acpi_verbose, 0, "verbose mode");
  583     SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  584         OID_AUTO, "disable_on_reboot", CTLFLAG_RW,
  585         &sc->acpi_do_disable, 0, "Disable ACPI when rebooting/halting system");
  586     SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  587         OID_AUTO, "handle_reboot", CTLFLAG_RW,
  588         &sc->acpi_handle_reboot, 0, "Use ACPI Reset Register to reboot");
  589 
  590     /*
  591      * Default to 1 second before sleeping to give some machines time to
  592      * stabilize.
  593      */
  594     sc->acpi_sleep_delay = 1;
  595     if (bootverbose)
  596         sc->acpi_verbose = 1;
  597     if ((env = getenv("hw.acpi.verbose")) != NULL) {
  598         if (strcmp(env, "") != 0)
  599             sc->acpi_verbose = 1;
  600         freeenv(env);
  601     }
  602 
  603     /* Only enable reboot by default if the FADT says it is available. */
  604     if (AcpiGbl_FADT.Flags & ACPI_FADT_RESET_REGISTER)
  605         sc->acpi_handle_reboot = 1;
  606 
  607     /* Only enable S4BIOS by default if the FACS says it is available. */
  608     if (AcpiGbl_FACS->Flags & ACPI_FACS_S4_BIOS_PRESENT)
  609         sc->acpi_s4bios = 1;
  610 
  611     /* Probe all supported sleep states. */
  612     acpi_sleep_states[ACPI_STATE_S0] = TRUE;
  613     for (state = ACPI_STATE_S1; state < ACPI_S_STATE_COUNT; state++)
  614         if (ACPI_SUCCESS(AcpiEvaluateObject(ACPI_ROOT_OBJECT,
  615             __DECONST(char *, AcpiGbl_SleepStateNames[state]), NULL, NULL)) &&
  616             ACPI_SUCCESS(AcpiGetSleepTypeData(state, &TypeA, &TypeB)))
  617             acpi_sleep_states[state] = TRUE;
  618 
  619     /*
  620      * Dispatch the default sleep state to devices.  The lid switch is set
  621      * to UNKNOWN by default to avoid surprising users.
  622      */
  623     sc->acpi_power_button_sx = acpi_sleep_states[ACPI_STATE_S5] ?
  624         ACPI_STATE_S5 : ACPI_STATE_UNKNOWN;
  625     sc->acpi_lid_switch_sx = ACPI_STATE_UNKNOWN;
  626     sc->acpi_standby_sx = acpi_sleep_states[ACPI_STATE_S1] ?
  627         ACPI_STATE_S1 : ACPI_STATE_UNKNOWN;
  628     sc->acpi_suspend_sx = acpi_sleep_states[ACPI_STATE_S3] ?
  629         ACPI_STATE_S3 : ACPI_STATE_UNKNOWN;
  630 
  631     /* Pick the first valid sleep state for the sleep button default. */
  632     sc->acpi_sleep_button_sx = ACPI_STATE_UNKNOWN;
  633     for (state = ACPI_STATE_S1; state <= ACPI_STATE_S4; state++)
  634         if (acpi_sleep_states[state]) {
  635             sc->acpi_sleep_button_sx = state;
  636             break;
  637         }
  638 
  639     acpi_enable_fixed_events(sc);
  640 
  641     /*
  642      * Scan the namespace and attach/initialise children.
  643      */
  644 
  645     /* Register our shutdown handler. */
  646     EVENTHANDLER_REGISTER(shutdown_final, acpi_shutdown_final, sc,
  647         SHUTDOWN_PRI_LAST);
  648 
  649     /*
  650      * Register our acpi event handlers.
  651      * XXX should be configurable eg. via userland policy manager.
  652      */
  653     EVENTHANDLER_REGISTER(acpi_sleep_event, acpi_system_eventhandler_sleep,
  654         sc, ACPI_EVENT_PRI_LAST);
  655     EVENTHANDLER_REGISTER(acpi_wakeup_event, acpi_system_eventhandler_wakeup,
  656         sc, ACPI_EVENT_PRI_LAST);
  657 
  658     /* Flag our initial states. */
  659     sc->acpi_enabled = TRUE;
  660     sc->acpi_sstate = ACPI_STATE_S0;
  661     sc->acpi_sleep_disabled = TRUE;
  662 
  663     /* Create the control device */
  664     sc->acpi_dev_t = make_dev(&acpi_cdevsw, 0, UID_ROOT, GID_WHEEL, 0644,
  665                               "acpi");
  666     sc->acpi_dev_t->si_drv1 = sc;
  667 
  668     if ((error = acpi_machdep_init(dev)))
  669         goto out;
  670 
  671     /* Register ACPI again to pass the correct argument of pm_func. */
  672     power_pm_register(POWER_PM_TYPE_ACPI, acpi_pm_func, sc);
  673 
  674     if (!acpi_disabled("bus")) {
  675         EVENTHANDLER_REGISTER(dev_lookup, acpi_lookup, NULL, 1000);
  676         acpi_probe_children(dev);
  677     }
  678 
  679     /* Update all GPEs and enable runtime GPEs. */
  680     status = AcpiUpdateAllGpes();
  681     if (ACPI_FAILURE(status))
  682         device_printf(dev, "Could not update all GPEs: %s\n",
  683             AcpiFormatException(status));
  684 
  685     /* Allow sleep request after a while. */
  686     timeout(acpi_sleep_enable, sc, hz * ACPI_MINIMUM_AWAKETIME);
  687 
  688     error = 0;
  689 
  690  out:
  691     return_VALUE (error);
  692 }
  693 
  694 static void
  695 acpi_set_power_children(device_t dev, int state)
  696 {
  697         device_t child, parent;
  698         device_t *devlist;
  699         struct pci_devinfo *dinfo;
  700         int dstate, i, numdevs;
  701 
  702         if (device_get_children(dev, &devlist, &numdevs) != 0)
  703                 return;
  704 
  705         /*
  706          * Retrieve and set D-state for the sleep state if _SxD is present.
  707          * Skip children who aren't attached since they are handled separately.
  708          */
  709         parent = device_get_parent(dev);
  710         for (i = 0; i < numdevs; i++) {
  711                 child = devlist[i];
  712                 dinfo = device_get_ivars(child);
  713                 dstate = state;
  714                 if (device_is_attached(child) &&
  715                     acpi_device_pwr_for_sleep(parent, dev, &dstate) == 0)
  716                         acpi_set_powerstate(child, dstate);
  717         }
  718         free(devlist, M_TEMP);
  719 }
  720 
  721 static int
  722 acpi_suspend(device_t dev)
  723 {
  724     int error;
  725 
  726     GIANT_REQUIRED;
  727 
  728     error = bus_generic_suspend(dev);
  729     if (error == 0)
  730         acpi_set_power_children(dev, ACPI_STATE_D3);
  731 
  732     return (error);
  733 }
  734 
  735 static int
  736 acpi_resume(device_t dev)
  737 {
  738 
  739     GIANT_REQUIRED;
  740 
  741     acpi_set_power_children(dev, ACPI_STATE_D0);
  742 
  743     return (bus_generic_resume(dev));
  744 }
  745 
  746 static int
  747 acpi_shutdown(device_t dev)
  748 {
  749 
  750     GIANT_REQUIRED;
  751 
  752     /* Allow children to shutdown first. */
  753     bus_generic_shutdown(dev);
  754 
  755     /*
  756      * Enable any GPEs that are able to power-on the system (i.e., RTC).
  757      * Also, disable any that are not valid for this state (most).
  758      */
  759     acpi_wake_prep_walk(ACPI_STATE_S5);
  760 
  761     return (0);
  762 }
  763 
  764 /*
  765  * Handle a new device being added
  766  */
  767 static device_t
  768 acpi_add_child(device_t bus, u_int order, const char *name, int unit)
  769 {
  770     struct acpi_device  *ad;
  771     device_t            child;
  772 
  773     if ((ad = malloc(sizeof(*ad), M_ACPIDEV, M_NOWAIT | M_ZERO)) == NULL)
  774         return (NULL);
  775 
  776     resource_list_init(&ad->ad_rl);
  777 
  778     child = device_add_child_ordered(bus, order, name, unit);
  779     if (child != NULL)
  780         device_set_ivars(child, ad);
  781     else
  782         free(ad, M_ACPIDEV);
  783     return (child);
  784 }
  785 
  786 static int
  787 acpi_print_child(device_t bus, device_t child)
  788 {
  789     struct acpi_device   *adev = device_get_ivars(child);
  790     struct resource_list *rl = &adev->ad_rl;
  791     int retval = 0;
  792 
  793     retval += bus_print_child_header(bus, child);
  794     retval += resource_list_print_type(rl, "port",  SYS_RES_IOPORT, "%#lx");
  795     retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
  796     retval += resource_list_print_type(rl, "irq",   SYS_RES_IRQ,    "%ld");
  797     retval += resource_list_print_type(rl, "drq",   SYS_RES_DRQ,    "%ld");
  798     if (device_get_flags(child))
  799         retval += printf(" flags %#x", device_get_flags(child));
  800     retval += bus_print_child_domain(bus, child);
  801     retval += bus_print_child_footer(bus, child);
  802 
  803     return (retval);
  804 }
  805 
  806 /*
  807  * If this device is an ACPI child but no one claimed it, attempt
  808  * to power it off.  We'll power it back up when a driver is added.
  809  *
  810  * XXX Disabled for now since many necessary devices (like fdc and
  811  * ATA) don't claim the devices we created for them but still expect
  812  * them to be powered up.
  813  */
  814 static void
  815 acpi_probe_nomatch(device_t bus, device_t child)
  816 {
  817 #ifdef ACPI_ENABLE_POWERDOWN_NODRIVER
  818     acpi_set_powerstate(child, ACPI_STATE_D3);
  819 #endif
  820 }
  821 
  822 /*
  823  * If a new driver has a chance to probe a child, first power it up.
  824  *
  825  * XXX Disabled for now (see acpi_probe_nomatch for details).
  826  */
  827 static void
  828 acpi_driver_added(device_t dev, driver_t *driver)
  829 {
  830     device_t child, *devlist;
  831     int i, numdevs;
  832 
  833     DEVICE_IDENTIFY(driver, dev);
  834     if (device_get_children(dev, &devlist, &numdevs))
  835             return;
  836     for (i = 0; i < numdevs; i++) {
  837         child = devlist[i];
  838         if (device_get_state(child) == DS_NOTPRESENT) {
  839 #ifdef ACPI_ENABLE_POWERDOWN_NODRIVER
  840             acpi_set_powerstate(child, ACPI_STATE_D0);
  841             if (device_probe_and_attach(child) != 0)
  842                 acpi_set_powerstate(child, ACPI_STATE_D3);
  843 #else
  844             device_probe_and_attach(child);
  845 #endif
  846         }
  847     }
  848     free(devlist, M_TEMP);
  849 }
  850 
  851 /* Location hint for devctl(8) */
  852 static int
  853 acpi_child_location_str_method(device_t cbdev, device_t child, char *buf,
  854     size_t buflen)
  855 {
  856     struct acpi_device *dinfo = device_get_ivars(child);
  857     char buf2[32];
  858     int pxm;
  859 
  860     if (dinfo->ad_handle) {
  861         snprintf(buf, buflen, "handle=%s", acpi_name(dinfo->ad_handle));
  862         if (ACPI_SUCCESS(acpi_GetInteger(dinfo->ad_handle, "_PXM", &pxm))) {
  863                 snprintf(buf2, 32, " _PXM=%d", pxm);
  864                 strlcat(buf, buf2, buflen);
  865         }
  866     } else {
  867         snprintf(buf, buflen, "unknown");
  868     }
  869     return (0);
  870 }
  871 
  872 /* PnP information for devctl(8) */
  873 static int
  874 acpi_child_pnpinfo_str_method(device_t cbdev, device_t child, char *buf,
  875     size_t buflen)
  876 {
  877     struct acpi_device *dinfo = device_get_ivars(child);
  878     ACPI_DEVICE_INFO *adinfo;
  879 
  880     if (ACPI_FAILURE(AcpiGetObjectInfo(dinfo->ad_handle, &adinfo))) {
  881         snprintf(buf, buflen, "unknown");
  882         return (0);
  883     }
  884 
  885     snprintf(buf, buflen, "_HID=%s _UID=%lu",
  886         (adinfo->Valid & ACPI_VALID_HID) ?
  887         adinfo->HardwareId.String : "none",
  888         (adinfo->Valid & ACPI_VALID_UID) ?
  889         strtoul(adinfo->UniqueId.String, NULL, 10) : 0UL);
  890     AcpiOsFree(adinfo);
  891 
  892     return (0);
  893 }
  894 
  895 /*
  896  * Handle per-device ivars
  897  */
  898 static int
  899 acpi_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
  900 {
  901     struct acpi_device  *ad;
  902 
  903     if ((ad = device_get_ivars(child)) == NULL) {
  904         device_printf(child, "device has no ivars\n");
  905         return (ENOENT);
  906     }
  907 
  908     /* ACPI and ISA compatibility ivars */
  909     switch(index) {
  910     case ACPI_IVAR_HANDLE:
  911         *(ACPI_HANDLE *)result = ad->ad_handle;
  912         break;
  913     case ACPI_IVAR_PRIVATE:
  914         *(void **)result = ad->ad_private;
  915         break;
  916     case ACPI_IVAR_FLAGS:
  917         *(int *)result = ad->ad_flags;
  918         break;
  919     case ISA_IVAR_VENDORID:
  920     case ISA_IVAR_SERIAL:
  921     case ISA_IVAR_COMPATID:
  922         *(int *)result = -1;
  923         break;
  924     case ISA_IVAR_LOGICALID:
  925         *(int *)result = acpi_isa_get_logicalid(child);
  926         break;
  927     default:
  928         return (ENOENT);
  929     }
  930 
  931     return (0);
  932 }
  933 
  934 static int
  935 acpi_write_ivar(device_t dev, device_t child, int index, uintptr_t value)
  936 {
  937     struct acpi_device  *ad;
  938 
  939     if ((ad = device_get_ivars(child)) == NULL) {
  940         device_printf(child, "device has no ivars\n");
  941         return (ENOENT);
  942     }
  943 
  944     switch(index) {
  945     case ACPI_IVAR_HANDLE:
  946         ad->ad_handle = (ACPI_HANDLE)value;
  947         break;
  948     case ACPI_IVAR_PRIVATE:
  949         ad->ad_private = (void *)value;
  950         break;
  951     case ACPI_IVAR_FLAGS:
  952         ad->ad_flags = (int)value;
  953         break;
  954     default:
  955         panic("bad ivar write request (%d)", index);
  956         return (ENOENT);
  957     }
  958 
  959     return (0);
  960 }
  961 
  962 /*
  963  * Handle child resource allocation/removal
  964  */
  965 static struct resource_list *
  966 acpi_get_rlist(device_t dev, device_t child)
  967 {
  968     struct acpi_device          *ad;
  969 
  970     ad = device_get_ivars(child);
  971     return (&ad->ad_rl);
  972 }
  973 
  974 static int
  975 acpi_match_resource_hint(device_t dev, int type, long value)
  976 {
  977     struct acpi_device *ad = device_get_ivars(dev);
  978     struct resource_list *rl = &ad->ad_rl;
  979     struct resource_list_entry *rle;
  980 
  981     STAILQ_FOREACH(rle, rl, link) {
  982         if (rle->type != type)
  983             continue;
  984         if (rle->start <= value && rle->end >= value)
  985             return (1);
  986     }
  987     return (0);
  988 }
  989 
  990 /*
  991  * Wire device unit numbers based on resource matches in hints.
  992  */
  993 static void
  994 acpi_hint_device_unit(device_t acdev, device_t child, const char *name,
  995     int *unitp)
  996 {
  997     const char *s;
  998     long value;
  999     int line, matches, unit;
 1000 
 1001     /*
 1002      * Iterate over all the hints for the devices with the specified
 1003      * name to see if one's resources are a subset of this device.
 1004      */
 1005     line = 0;
 1006     for (;;) {
 1007         if (resource_find_dev(&line, name, &unit, "at", NULL) != 0)
 1008             break;
 1009 
 1010         /* Must have an "at" for acpi or isa. */
 1011         resource_string_value(name, unit, "at", &s);
 1012         if (!(strcmp(s, "acpi0") == 0 || strcmp(s, "acpi") == 0 ||
 1013             strcmp(s, "isa0") == 0 || strcmp(s, "isa") == 0))
 1014             continue;
 1015 
 1016         /*
 1017          * Check for matching resources.  We must have at least one match.
 1018          * Since I/O and memory resources cannot be shared, if we get a
 1019          * match on either of those, ignore any mismatches in IRQs or DRQs.
 1020          *
 1021          * XXX: We may want to revisit this to be more lenient and wire
 1022          * as long as it gets one match.
 1023          */
 1024         matches = 0;
 1025         if (resource_long_value(name, unit, "port", &value) == 0) {
 1026             /*
 1027              * Floppy drive controllers are notorious for having a
 1028              * wide variety of resources not all of which include the
 1029              * first port that is specified by the hint (typically
 1030              * 0x3f0) (see the comment above fdc_isa_alloc_resources()
 1031              * in fdc_isa.c).  However, they do all seem to include
 1032              * port + 2 (e.g. 0x3f2) so for a floppy device, look for
 1033              * 'value + 2' in the port resources instead of the hint
 1034              * value.
 1035              */
 1036             if (strcmp(name, "fdc") == 0)
 1037                 value += 2;
 1038             if (acpi_match_resource_hint(child, SYS_RES_IOPORT, value))
 1039                 matches++;
 1040             else
 1041                 continue;
 1042         }
 1043         if (resource_long_value(name, unit, "maddr", &value) == 0) {
 1044             if (acpi_match_resource_hint(child, SYS_RES_MEMORY, value))
 1045                 matches++;
 1046             else
 1047                 continue;
 1048         }
 1049         if (matches > 0)
 1050             goto matched;
 1051         if (resource_long_value(name, unit, "irq", &value) == 0) {
 1052             if (acpi_match_resource_hint(child, SYS_RES_IRQ, value))
 1053                 matches++;
 1054             else
 1055                 continue;
 1056         }
 1057         if (resource_long_value(name, unit, "drq", &value) == 0) {
 1058             if (acpi_match_resource_hint(child, SYS_RES_DRQ, value))
 1059                 matches++;
 1060             else
 1061                 continue;
 1062         }
 1063 
 1064     matched:
 1065         if (matches > 0) {
 1066             /* We have a winner! */
 1067             *unitp = unit;
 1068             break;
 1069         }
 1070     }
 1071 }
 1072 
 1073 /*
 1074  * Fech the NUMA domain for the given device.
 1075  *
 1076  * If a device has a _PXM method, map that to a NUMA domain.
 1077  *
 1078  * If none is found, then it'll call the parent method.
 1079  * If there's no domain, return ENOENT.
 1080  */
 1081 int
 1082 acpi_get_domain(device_t dev, device_t child, int *domain)
 1083 {
 1084 #if MAXMEMDOM > 1
 1085         ACPI_HANDLE h;
 1086         int d, pxm;
 1087 
 1088         h = acpi_get_handle(child);
 1089         if ((h != NULL) &&
 1090             ACPI_SUCCESS(acpi_GetInteger(h, "_PXM", &pxm))) {
 1091                 d = acpi_map_pxm_to_vm_domainid(pxm);
 1092                 if (d < 0)
 1093                         return (ENOENT);
 1094                 *domain = d;
 1095                 return (0);
 1096         }
 1097 #endif
 1098         /* No _PXM node; go up a level */
 1099         return (bus_generic_get_domain(dev, child, domain));
 1100 }
 1101 
 1102 /*
 1103  * Pre-allocate/manage all memory and IO resources.  Since rman can't handle
 1104  * duplicates, we merge any in the sysresource attach routine.
 1105  */
 1106 static int
 1107 acpi_sysres_alloc(device_t dev)
 1108 {
 1109     struct resource *res;
 1110     struct resource_list *rl;
 1111     struct resource_list_entry *rle;
 1112     struct rman *rm;
 1113     char *sysres_ids[] = { "PNP0C01", "PNP0C02", NULL };
 1114     device_t *children;
 1115     int child_count, i;
 1116 
 1117     /*
 1118      * Probe/attach any sysresource devices.  This would be unnecessary if we
 1119      * had multi-pass probe/attach.
 1120      */
 1121     if (device_get_children(dev, &children, &child_count) != 0)
 1122         return (ENXIO);
 1123     for (i = 0; i < child_count; i++) {
 1124         if (ACPI_ID_PROBE(dev, children[i], sysres_ids) != NULL)
 1125             device_probe_and_attach(children[i]);
 1126     }
 1127     free(children, M_TEMP);
 1128 
 1129     rl = BUS_GET_RESOURCE_LIST(device_get_parent(dev), dev);
 1130     STAILQ_FOREACH(rle, rl, link) {
 1131         if (rle->res != NULL) {
 1132             device_printf(dev, "duplicate resource for %lx\n", rle->start);
 1133             continue;
 1134         }
 1135 
 1136         /* Only memory and IO resources are valid here. */
 1137         switch (rle->type) {
 1138         case SYS_RES_IOPORT:
 1139             rm = &acpi_rman_io;
 1140             break;
 1141         case SYS_RES_MEMORY:
 1142             rm = &acpi_rman_mem;
 1143             break;
 1144         default:
 1145             continue;
 1146         }
 1147 
 1148         /* Pre-allocate resource and add to our rman pool. */
 1149         res = BUS_ALLOC_RESOURCE(device_get_parent(dev), dev, rle->type,
 1150             &rle->rid, rle->start, rle->start + rle->count - 1, rle->count, 0);
 1151         if (res != NULL) {
 1152             rman_manage_region(rm, rman_get_start(res), rman_get_end(res));
 1153             rle->res = res;
 1154         } else if (bootverbose)
 1155             device_printf(dev, "reservation of %lx, %lx (%d) failed\n",
 1156                 rle->start, rle->count, rle->type);
 1157     }
 1158     return (0);
 1159 }
 1160 
 1161 static char *pcilink_ids[] = { "PNP0C0F", NULL };
 1162 static char *sysres_ids[] = { "PNP0C01", "PNP0C02", NULL };
 1163 
 1164 /*
 1165  * Reserve declared resources for devices found during attach once system
 1166  * resources have been allocated.
 1167  */
 1168 static void
 1169 acpi_reserve_resources(device_t dev)
 1170 {
 1171     struct resource_list_entry *rle;
 1172     struct resource_list *rl;
 1173     struct acpi_device *ad;
 1174     struct acpi_softc *sc;
 1175     device_t *children;
 1176     int child_count, i;
 1177 
 1178     sc = device_get_softc(dev);
 1179     if (device_get_children(dev, &children, &child_count) != 0)
 1180         return;
 1181     for (i = 0; i < child_count; i++) {
 1182         ad = device_get_ivars(children[i]);
 1183         rl = &ad->ad_rl;
 1184 
 1185         /* Don't reserve system resources. */
 1186         if (ACPI_ID_PROBE(dev, children[i], sysres_ids) != NULL)
 1187             continue;
 1188 
 1189         STAILQ_FOREACH(rle, rl, link) {
 1190             /*
 1191              * Don't reserve IRQ resources.  There are many sticky things
 1192              * to get right otherwise (e.g. IRQs for psm, atkbd, and HPET
 1193              * when using legacy routing).
 1194              */
 1195             if (rle->type == SYS_RES_IRQ)
 1196                 continue;
 1197 
 1198             /*
 1199              * Don't reserve the resource if it is already allocated.
 1200              * The acpi_ec(4) driver can allocate its resources early
 1201              * if ECDT is present.
 1202              */
 1203             if (rle->res != NULL)
 1204                 continue;
 1205 
 1206             /*
 1207              * Try to reserve the resource from our parent.  If this
 1208              * fails because the resource is a system resource, just
 1209              * let it be.  The resource range is already reserved so
 1210              * that other devices will not use it.  If the driver
 1211              * needs to allocate the resource, then
 1212              * acpi_alloc_resource() will sub-alloc from the system
 1213              * resource.
 1214              */
 1215             resource_list_reserve(rl, dev, children[i], rle->type, &rle->rid,
 1216                 rle->start, rle->end, rle->count, 0);
 1217         }
 1218     }
 1219     free(children, M_TEMP);
 1220     sc->acpi_resources_reserved = 1;
 1221 }
 1222 
 1223 static int
 1224 acpi_set_resource(device_t dev, device_t child, int type, int rid,
 1225     u_long start, u_long count)
 1226 {
 1227     struct acpi_softc *sc = device_get_softc(dev);
 1228     struct acpi_device *ad = device_get_ivars(child);
 1229     struct resource_list *rl = &ad->ad_rl;
 1230     ACPI_DEVICE_INFO *devinfo;
 1231     u_long end;
 1232     
 1233     /* Ignore IRQ resources for PCI link devices. */
 1234     if (type == SYS_RES_IRQ && ACPI_ID_PROBE(dev, child, pcilink_ids) != NULL)
 1235         return (0);
 1236 
 1237     /*
 1238      * Ignore most resources for PCI root bridges.  Some BIOSes
 1239      * incorrectly enumerate the memory ranges they decode as plain
 1240      * memory resources instead of as ResourceProducer ranges.  Other
 1241      * BIOSes incorrectly list system resource entries for I/O ranges
 1242      * under the PCI bridge.  Do allow the one known-correct case on
 1243      * x86 of a PCI bridge claiming the I/O ports used for PCI config
 1244      * access.
 1245      */
 1246     if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
 1247         if (ACPI_SUCCESS(AcpiGetObjectInfo(ad->ad_handle, &devinfo))) {
 1248             if ((devinfo->Flags & ACPI_PCI_ROOT_BRIDGE) != 0) {
 1249 #if defined(__i386__) || defined(__amd64__)
 1250                 if (!(type == SYS_RES_IOPORT && start == CONF1_ADDR_PORT))
 1251 #endif
 1252                 {
 1253                     AcpiOsFree(devinfo);
 1254                     return (0);
 1255                 }
 1256             }
 1257             AcpiOsFree(devinfo);
 1258         }
 1259     }
 1260 
 1261     /* If the resource is already allocated, fail. */
 1262     if (resource_list_busy(rl, type, rid))
 1263         return (EBUSY);
 1264 
 1265     /* If the resource is already reserved, release it. */
 1266     if (resource_list_reserved(rl, type, rid))
 1267         resource_list_unreserve(rl, dev, child, type, rid);
 1268 
 1269     /* Add the resource. */
 1270     end = (start + count - 1);
 1271     resource_list_add(rl, type, rid, start, end, count);
 1272 
 1273     /* Don't reserve resources until the system resources are allocated. */
 1274     if (!sc->acpi_resources_reserved)
 1275         return (0);
 1276 
 1277     /* Don't reserve system resources. */
 1278     if (ACPI_ID_PROBE(dev, child, sysres_ids) != NULL)
 1279         return (0);
 1280 
 1281     /*
 1282      * Don't reserve IRQ resources.  There are many sticky things to
 1283      * get right otherwise (e.g. IRQs for psm, atkbd, and HPET when
 1284      * using legacy routing).
 1285      */
 1286     if (type == SYS_RES_IRQ)
 1287         return (0);
 1288 
 1289     /*
 1290      * Reserve the resource.
 1291      *
 1292      * XXX: Ignores failure for now.  Failure here is probably a
 1293      * BIOS/firmware bug?
 1294      */
 1295     resource_list_reserve(rl, dev, child, type, &rid, start, end, count, 0);
 1296     return (0);
 1297 }
 1298 
 1299 static struct resource *
 1300 acpi_alloc_resource(device_t bus, device_t child, int type, int *rid,
 1301     u_long start, u_long end, u_long count, u_int flags)
 1302 {
 1303     ACPI_RESOURCE ares;
 1304     struct acpi_device *ad;
 1305     struct resource_list_entry *rle;
 1306     struct resource_list *rl;
 1307     struct resource *res;
 1308     int isdefault = (start == 0UL && end == ~0UL);
 1309 
 1310     /*
 1311      * First attempt at allocating the resource.  For direct children,
 1312      * use resource_list_alloc() to handle reserved resources.  For
 1313      * other devices, pass the request up to our parent.
 1314      */
 1315     if (bus == device_get_parent(child)) {
 1316         ad = device_get_ivars(child);
 1317         rl = &ad->ad_rl;
 1318 
 1319         /*
 1320          * Simulate the behavior of the ISA bus for direct children
 1321          * devices.  That is, if a non-default range is specified for
 1322          * a resource that doesn't exist, use bus_set_resource() to
 1323          * add the resource before allocating it.  Note that these
 1324          * resources will not be reserved.
 1325          */
 1326         if (!isdefault && resource_list_find(rl, type, *rid) == NULL)
 1327                 resource_list_add(rl, type, *rid, start, end, count);
 1328         res = resource_list_alloc(rl, bus, child, type, rid, start, end, count,
 1329             flags);
 1330         if (res != NULL && type == SYS_RES_IRQ) {
 1331             /*
 1332              * Since bus_config_intr() takes immediate effect, we cannot
 1333              * configure the interrupt associated with a device when we
 1334              * parse the resources but have to defer it until a driver
 1335              * actually allocates the interrupt via bus_alloc_resource().
 1336              *
 1337              * XXX: Should we handle the lookup failing?
 1338              */
 1339             if (ACPI_SUCCESS(acpi_lookup_irq_resource(child, *rid, res, &ares)))
 1340                 acpi_config_intr(child, &ares);
 1341         }
 1342 
 1343         /*
 1344          * If this is an allocation of the "default" range for a given
 1345          * RID, fetch the exact bounds for this resource from the
 1346          * resource list entry to try to allocate the range from the
 1347          * system resource regions.
 1348          */
 1349         if (res == NULL && isdefault) {
 1350             rle = resource_list_find(rl, type, *rid);
 1351             if (rle != NULL) {
 1352                 start = rle->start;
 1353                 end = rle->end;
 1354                 count = rle->count;
 1355             }
 1356         }
 1357     } else
 1358         res = BUS_ALLOC_RESOURCE(device_get_parent(bus), child, type, rid,
 1359             start, end, count, flags);
 1360 
 1361     /*
 1362      * If the first attempt failed and this is an allocation of a
 1363      * specific range, try to satisfy the request via a suballocation
 1364      * from our system resource regions.
 1365      */
 1366     if (res == NULL && start + count - 1 == end)
 1367         res = acpi_alloc_sysres(child, type, rid, start, end, count, flags);
 1368     return (res);
 1369 }
 1370 
 1371 /*
 1372  * Attempt to allocate a specific resource range from the system
 1373  * resource ranges.  Note that we only handle memory and I/O port
 1374  * system resources.
 1375  */
 1376 struct resource *
 1377 acpi_alloc_sysres(device_t child, int type, int *rid, u_long start, u_long end,
 1378     u_long count, u_int flags)
 1379 {
 1380     struct rman *rm;
 1381     struct resource *res;
 1382 
 1383     switch (type) {
 1384     case SYS_RES_IOPORT:
 1385         rm = &acpi_rman_io;
 1386         break;
 1387     case SYS_RES_MEMORY:
 1388         rm = &acpi_rman_mem;
 1389         break;
 1390     default:
 1391         return (NULL);
 1392     }
 1393 
 1394     KASSERT(start + count - 1 == end, ("wildcard resource range"));
 1395     res = rman_reserve_resource(rm, start, end, count, flags & ~RF_ACTIVE,
 1396         child);
 1397     if (res == NULL)
 1398         return (NULL);
 1399 
 1400     rman_set_rid(res, *rid);
 1401 
 1402     /* If requested, activate the resource using the parent's method. */
 1403     if (flags & RF_ACTIVE)
 1404         if (bus_activate_resource(child, type, *rid, res) != 0) {
 1405             rman_release_resource(res);
 1406             return (NULL);
 1407         }
 1408 
 1409     return (res);
 1410 }
 1411 
 1412 static int
 1413 acpi_is_resource_managed(int type, struct resource *r)
 1414 {
 1415 
 1416     /* We only handle memory and IO resources through rman. */
 1417     switch (type) {
 1418     case SYS_RES_IOPORT:
 1419         return (rman_is_region_manager(r, &acpi_rman_io));
 1420     case SYS_RES_MEMORY:
 1421         return (rman_is_region_manager(r, &acpi_rman_mem));
 1422     }
 1423     return (0);
 1424 }
 1425 
 1426 static int
 1427 acpi_adjust_resource(device_t bus, device_t child, int type, struct resource *r,
 1428     u_long start, u_long end)
 1429 {
 1430 
 1431     if (acpi_is_resource_managed(type, r))
 1432         return (rman_adjust_resource(r, start, end));
 1433     return (bus_generic_adjust_resource(bus, child, type, r, start, end));
 1434 }
 1435 
 1436 static int
 1437 acpi_release_resource(device_t bus, device_t child, int type, int rid,
 1438     struct resource *r)
 1439 {
 1440     int ret;
 1441 
 1442     /*
 1443      * If this resource belongs to one of our internal managers,
 1444      * deactivate it and release it to the local pool.
 1445      */
 1446     if (acpi_is_resource_managed(type, r)) {
 1447         if (rman_get_flags(r) & RF_ACTIVE) {
 1448             ret = bus_deactivate_resource(child, type, rid, r);
 1449             if (ret != 0)
 1450                 return (ret);
 1451         }
 1452         return (rman_release_resource(r));
 1453     }
 1454 
 1455     return (bus_generic_rl_release_resource(bus, child, type, rid, r));
 1456 }
 1457 
 1458 static void
 1459 acpi_delete_resource(device_t bus, device_t child, int type, int rid)
 1460 {
 1461     struct resource_list *rl;
 1462 
 1463     rl = acpi_get_rlist(bus, child);
 1464     if (resource_list_busy(rl, type, rid)) {
 1465         device_printf(bus, "delete_resource: Resource still owned by child"
 1466             " (type=%d, rid=%d)\n", type, rid);
 1467         return;
 1468     }
 1469     resource_list_unreserve(rl, bus, child, type, rid);
 1470     resource_list_delete(rl, type, rid);
 1471 }
 1472 
 1473 /* Allocate an IO port or memory resource, given its GAS. */
 1474 int
 1475 acpi_bus_alloc_gas(device_t dev, int *type, int *rid, ACPI_GENERIC_ADDRESS *gas,
 1476     struct resource **res, u_int flags)
 1477 {
 1478     int error, res_type;
 1479 
 1480     error = ENOMEM;
 1481     if (type == NULL || rid == NULL || gas == NULL || res == NULL)
 1482         return (EINVAL);
 1483 
 1484     /* We only support memory and IO spaces. */
 1485     switch (gas->SpaceId) {
 1486     case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 1487         res_type = SYS_RES_MEMORY;
 1488         break;
 1489     case ACPI_ADR_SPACE_SYSTEM_IO:
 1490         res_type = SYS_RES_IOPORT;
 1491         break;
 1492     default:
 1493         return (EOPNOTSUPP);
 1494     }
 1495 
 1496     /*
 1497      * If the register width is less than 8, assume the BIOS author means
 1498      * it is a bit field and just allocate a byte.
 1499      */
 1500     if (gas->BitWidth && gas->BitWidth < 8)
 1501         gas->BitWidth = 8;
 1502 
 1503     /* Validate the address after we're sure we support the space. */
 1504     if (gas->Address == 0 || gas->BitWidth == 0)
 1505         return (EINVAL);
 1506 
 1507     bus_set_resource(dev, res_type, *rid, gas->Address,
 1508         gas->BitWidth / 8);
 1509     *res = bus_alloc_resource_any(dev, res_type, rid, RF_ACTIVE | flags);
 1510     if (*res != NULL) {
 1511         *type = res_type;
 1512         error = 0;
 1513     } else
 1514         bus_delete_resource(dev, res_type, *rid);
 1515 
 1516     return (error);
 1517 }
 1518 
 1519 /* Probe _HID and _CID for compatible ISA PNP ids. */
 1520 static uint32_t
 1521 acpi_isa_get_logicalid(device_t dev)
 1522 {
 1523     ACPI_DEVICE_INFO    *devinfo;
 1524     ACPI_HANDLE         h;
 1525     uint32_t            pnpid;
 1526 
 1527     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 1528 
 1529     /* Fetch and validate the HID. */
 1530     if ((h = acpi_get_handle(dev)) == NULL ||
 1531         ACPI_FAILURE(AcpiGetObjectInfo(h, &devinfo)))
 1532         return_VALUE (0);
 1533 
 1534     pnpid = (devinfo->Valid & ACPI_VALID_HID) != 0 &&
 1535         devinfo->HardwareId.Length >= ACPI_EISAID_STRING_SIZE ?
 1536         PNP_EISAID(devinfo->HardwareId.String) : 0;
 1537     AcpiOsFree(devinfo);
 1538 
 1539     return_VALUE (pnpid);
 1540 }
 1541 
 1542 static int
 1543 acpi_isa_get_compatid(device_t dev, uint32_t *cids, int count)
 1544 {
 1545     ACPI_DEVICE_INFO    *devinfo;
 1546     ACPI_PNP_DEVICE_ID  *ids;
 1547     ACPI_HANDLE         h;
 1548     uint32_t            *pnpid;
 1549     int                 i, valid;
 1550 
 1551     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 1552 
 1553     pnpid = cids;
 1554 
 1555     /* Fetch and validate the CID */
 1556     if ((h = acpi_get_handle(dev)) == NULL ||
 1557         ACPI_FAILURE(AcpiGetObjectInfo(h, &devinfo)))
 1558         return_VALUE (0);
 1559 
 1560     if ((devinfo->Valid & ACPI_VALID_CID) == 0) {
 1561         AcpiOsFree(devinfo);
 1562         return_VALUE (0);
 1563     }
 1564 
 1565     if (devinfo->CompatibleIdList.Count < count)
 1566         count = devinfo->CompatibleIdList.Count;
 1567     ids = devinfo->CompatibleIdList.Ids;
 1568     for (i = 0, valid = 0; i < count; i++)
 1569         if (ids[i].Length >= ACPI_EISAID_STRING_SIZE &&
 1570             strncmp(ids[i].String, "PNP", 3) == 0) {
 1571             *pnpid++ = PNP_EISAID(ids[i].String);
 1572             valid++;
 1573         }
 1574     AcpiOsFree(devinfo);
 1575 
 1576     return_VALUE (valid);
 1577 }
 1578 
 1579 static char *
 1580 acpi_device_id_probe(device_t bus, device_t dev, char **ids) 
 1581 {
 1582     ACPI_HANDLE h;
 1583     ACPI_OBJECT_TYPE t;
 1584     int i;
 1585 
 1586     h = acpi_get_handle(dev);
 1587     if (ids == NULL || h == NULL)
 1588         return (NULL);
 1589     t = acpi_get_type(dev);
 1590     if (t != ACPI_TYPE_DEVICE && t != ACPI_TYPE_PROCESSOR)
 1591         return (NULL);
 1592 
 1593     /* Try to match one of the array of IDs with a HID or CID. */
 1594     for (i = 0; ids[i] != NULL; i++) {
 1595         if (acpi_MatchHid(h, ids[i]))
 1596             return (ids[i]);
 1597     }
 1598     return (NULL);
 1599 }
 1600 
 1601 static ACPI_STATUS
 1602 acpi_device_eval_obj(device_t bus, device_t dev, ACPI_STRING pathname,
 1603     ACPI_OBJECT_LIST *parameters, ACPI_BUFFER *ret)
 1604 {
 1605     ACPI_HANDLE h;
 1606 
 1607     if (dev == NULL)
 1608         h = ACPI_ROOT_OBJECT;
 1609     else if ((h = acpi_get_handle(dev)) == NULL)
 1610         return (AE_BAD_PARAMETER);
 1611     return (AcpiEvaluateObject(h, pathname, parameters, ret));
 1612 }
 1613 
 1614 int
 1615 acpi_device_pwr_for_sleep(device_t bus, device_t dev, int *dstate)
 1616 {
 1617     struct acpi_softc *sc;
 1618     ACPI_HANDLE handle;
 1619     ACPI_STATUS status;
 1620     char sxd[8];
 1621 
 1622     handle = acpi_get_handle(dev);
 1623 
 1624     /*
 1625      * XXX If we find these devices, don't try to power them down.
 1626      * The serial and IRDA ports on my T23 hang the system when
 1627      * set to D3 and it appears that such legacy devices may
 1628      * need special handling in their drivers.
 1629      */
 1630     if (dstate == NULL || handle == NULL ||
 1631         acpi_MatchHid(handle, "PNP0500") ||
 1632         acpi_MatchHid(handle, "PNP0501") ||
 1633         acpi_MatchHid(handle, "PNP0502") ||
 1634         acpi_MatchHid(handle, "PNP0510") ||
 1635         acpi_MatchHid(handle, "PNP0511"))
 1636         return (ENXIO);
 1637 
 1638     /*
 1639      * Override next state with the value from _SxD, if present.
 1640      * Note illegal _S0D is evaluated because some systems expect this.
 1641      */
 1642     sc = device_get_softc(bus);
 1643     snprintf(sxd, sizeof(sxd), "_S%dD", sc->acpi_sstate);
 1644     status = acpi_GetInteger(handle, sxd, dstate);
 1645     if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 1646             device_printf(dev, "failed to get %s on %s: %s\n", sxd,
 1647                 acpi_name(handle), AcpiFormatException(status));
 1648             return (ENXIO);
 1649     }
 1650 
 1651     return (0);
 1652 }
 1653 
 1654 /* Callback arg for our implementation of walking the namespace. */
 1655 struct acpi_device_scan_ctx {
 1656     acpi_scan_cb_t      user_fn;
 1657     void                *arg;
 1658     ACPI_HANDLE         parent;
 1659 };
 1660 
 1661 static ACPI_STATUS
 1662 acpi_device_scan_cb(ACPI_HANDLE h, UINT32 level, void *arg, void **retval)
 1663 {
 1664     struct acpi_device_scan_ctx *ctx;
 1665     device_t dev, old_dev;
 1666     ACPI_STATUS status;
 1667     ACPI_OBJECT_TYPE type;
 1668 
 1669     /*
 1670      * Skip this device if we think we'll have trouble with it or it is
 1671      * the parent where the scan began.
 1672      */
 1673     ctx = (struct acpi_device_scan_ctx *)arg;
 1674     if (acpi_avoid(h) || h == ctx->parent)
 1675         return (AE_OK);
 1676 
 1677     /* If this is not a valid device type (e.g., a method), skip it. */
 1678     if (ACPI_FAILURE(AcpiGetType(h, &type)))
 1679         return (AE_OK);
 1680     if (type != ACPI_TYPE_DEVICE && type != ACPI_TYPE_PROCESSOR &&
 1681         type != ACPI_TYPE_THERMAL && type != ACPI_TYPE_POWER)
 1682         return (AE_OK);
 1683 
 1684     /*
 1685      * Call the user function with the current device.  If it is unchanged
 1686      * afterwards, return.  Otherwise, we update the handle to the new dev.
 1687      */
 1688     old_dev = acpi_get_device(h);
 1689     dev = old_dev;
 1690     status = ctx->user_fn(h, &dev, level, ctx->arg);
 1691     if (ACPI_FAILURE(status) || old_dev == dev)
 1692         return (status);
 1693 
 1694     /* Remove the old child and its connection to the handle. */
 1695     if (old_dev != NULL) {
 1696         device_delete_child(device_get_parent(old_dev), old_dev);
 1697         AcpiDetachData(h, acpi_fake_objhandler);
 1698     }
 1699 
 1700     /* Recreate the handle association if the user created a device. */
 1701     if (dev != NULL)
 1702         AcpiAttachData(h, acpi_fake_objhandler, dev);
 1703 
 1704     return (AE_OK);
 1705 }
 1706 
 1707 static ACPI_STATUS
 1708 acpi_device_scan_children(device_t bus, device_t dev, int max_depth,
 1709     acpi_scan_cb_t user_fn, void *arg)
 1710 {
 1711     ACPI_HANDLE h;
 1712     struct acpi_device_scan_ctx ctx;
 1713 
 1714     if (acpi_disabled("children"))
 1715         return (AE_OK);
 1716 
 1717     if (dev == NULL)
 1718         h = ACPI_ROOT_OBJECT;
 1719     else if ((h = acpi_get_handle(dev)) == NULL)
 1720         return (AE_BAD_PARAMETER);
 1721     ctx.user_fn = user_fn;
 1722     ctx.arg = arg;
 1723     ctx.parent = h;
 1724     return (AcpiWalkNamespace(ACPI_TYPE_ANY, h, max_depth,
 1725         acpi_device_scan_cb, NULL, &ctx, NULL));
 1726 }
 1727 
 1728 /*
 1729  * Even though ACPI devices are not PCI, we use the PCI approach for setting
 1730  * device power states since it's close enough to ACPI.
 1731  */
 1732 static int
 1733 acpi_set_powerstate(device_t child, int state)
 1734 {
 1735     ACPI_HANDLE h;
 1736     ACPI_STATUS status;
 1737 
 1738     h = acpi_get_handle(child);
 1739     if (state < ACPI_STATE_D0 || state > ACPI_D_STATES_MAX)
 1740         return (EINVAL);
 1741     if (h == NULL)
 1742         return (0);
 1743 
 1744     /* Ignore errors if the power methods aren't present. */
 1745     status = acpi_pwr_switch_consumer(h, state);
 1746     if (ACPI_SUCCESS(status)) {
 1747         if (bootverbose)
 1748             device_printf(child, "set ACPI power state D%d on %s\n",
 1749                 state, acpi_name(h));
 1750     } else if (status != AE_NOT_FOUND)
 1751         device_printf(child,
 1752             "failed to set ACPI power state D%d on %s: %s\n", state,
 1753             acpi_name(h), AcpiFormatException(status));
 1754 
 1755     return (0);
 1756 }
 1757 
 1758 static int
 1759 acpi_isa_pnp_probe(device_t bus, device_t child, struct isa_pnp_id *ids)
 1760 {
 1761     int                 result, cid_count, i;
 1762     uint32_t            lid, cids[8];
 1763 
 1764     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 1765 
 1766     /*
 1767      * ISA-style drivers attached to ACPI may persist and
 1768      * probe manually if we return ENOENT.  We never want
 1769      * that to happen, so don't ever return it.
 1770      */
 1771     result = ENXIO;
 1772 
 1773     /* Scan the supplied IDs for a match */
 1774     lid = acpi_isa_get_logicalid(child);
 1775     cid_count = acpi_isa_get_compatid(child, cids, 8);
 1776     while (ids && ids->ip_id) {
 1777         if (lid == ids->ip_id) {
 1778             result = 0;
 1779             goto out;
 1780         }
 1781         for (i = 0; i < cid_count; i++) {
 1782             if (cids[i] == ids->ip_id) {
 1783                 result = 0;
 1784                 goto out;
 1785             }
 1786         }
 1787         ids++;
 1788     }
 1789 
 1790  out:
 1791     if (result == 0 && ids->ip_desc)
 1792         device_set_desc(child, ids->ip_desc);
 1793 
 1794     return_VALUE (result);
 1795 }
 1796 
 1797 #if defined(__i386__) || defined(__amd64__)
 1798 /*
 1799  * Look for a MCFG table.  If it is present, use the settings for
 1800  * domain (segment) 0 to setup PCI config space access via the memory
 1801  * map.
 1802  */
 1803 static void
 1804 acpi_enable_pcie(void)
 1805 {
 1806         ACPI_TABLE_HEADER *hdr;
 1807         ACPI_MCFG_ALLOCATION *alloc, *end;
 1808         ACPI_STATUS status;
 1809 
 1810         status = AcpiGetTable(ACPI_SIG_MCFG, 1, &hdr);
 1811         if (ACPI_FAILURE(status))
 1812                 return;
 1813 
 1814         end = (ACPI_MCFG_ALLOCATION *)((char *)hdr + hdr->Length);
 1815         alloc = (ACPI_MCFG_ALLOCATION *)((ACPI_TABLE_MCFG *)hdr + 1);
 1816         while (alloc < end) {
 1817                 if (alloc->PciSegment == 0) {
 1818                         pcie_cfgregopen(alloc->Address, alloc->StartBusNumber,
 1819                             alloc->EndBusNumber);
 1820                         return;
 1821                 }
 1822                 alloc++;
 1823         }
 1824 }
 1825 #endif
 1826 
 1827 /*
 1828  * Scan all of the ACPI namespace and attach child devices.
 1829  *
 1830  * We should only expect to find devices in the \_PR, \_TZ, \_SI, and
 1831  * \_SB scopes, and \_PR and \_TZ became obsolete in the ACPI 2.0 spec.
 1832  * However, in violation of the spec, some systems place their PCI link
 1833  * devices in \, so we have to walk the whole namespace.  We check the
 1834  * type of namespace nodes, so this should be ok.
 1835  */
 1836 static void
 1837 acpi_probe_children(device_t bus)
 1838 {
 1839 
 1840     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 1841 
 1842     /*
 1843      * Scan the namespace and insert placeholders for all the devices that
 1844      * we find.  We also probe/attach any early devices.
 1845      *
 1846      * Note that we use AcpiWalkNamespace rather than AcpiGetDevices because
 1847      * we want to create nodes for all devices, not just those that are
 1848      * currently present. (This assumes that we don't want to create/remove
 1849      * devices as they appear, which might be smarter.)
 1850      */
 1851     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "namespace scan\n"));
 1852     AcpiWalkNamespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, 100, acpi_probe_child,
 1853         NULL, bus, NULL);
 1854 
 1855     /* Pre-allocate resources for our rman from any sysresource devices. */
 1856     acpi_sysres_alloc(bus);
 1857 
 1858     /* Reserve resources already allocated to children. */
 1859     acpi_reserve_resources(bus);
 1860 
 1861     /* Create any static children by calling device identify methods. */
 1862     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "device identify routines\n"));
 1863     bus_generic_probe(bus);
 1864 
 1865     /* Probe/attach all children, created statically and from the namespace. */
 1866     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "acpi bus_generic_attach\n"));
 1867     bus_generic_attach(bus);
 1868 
 1869     /* Attach wake sysctls. */
 1870     acpi_wake_sysctl_walk(bus);
 1871 
 1872     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "done attaching children\n"));
 1873     return_VOID;
 1874 }
 1875 
 1876 /*
 1877  * Determine the probe order for a given device.
 1878  */
 1879 static void
 1880 acpi_probe_order(ACPI_HANDLE handle, int *order)
 1881 {
 1882         ACPI_OBJECT_TYPE type;
 1883 
 1884         /*
 1885          * 0. CPUs
 1886          * 1. I/O port and memory system resource holders
 1887          * 2. Clocks and timers (to handle early accesses)
 1888          * 3. Embedded controllers (to handle early accesses)
 1889          * 4. PCI Link Devices
 1890          */
 1891         AcpiGetType(handle, &type);
 1892         if (type == ACPI_TYPE_PROCESSOR)
 1893                 *order = 0;
 1894         else if (acpi_MatchHid(handle, "PNP0C01") ||
 1895             acpi_MatchHid(handle, "PNP0C02"))
 1896                 *order = 1;
 1897         else if (acpi_MatchHid(handle, "PNP0100") ||
 1898             acpi_MatchHid(handle, "PNP0103") ||
 1899             acpi_MatchHid(handle, "PNP0B00"))
 1900                 *order = 2;
 1901         else if (acpi_MatchHid(handle, "PNP0C09"))
 1902                 *order = 3;
 1903         else if (acpi_MatchHid(handle, "PNP0C0F"))
 1904                 *order = 4;
 1905 }
 1906 
 1907 /*
 1908  * Evaluate a child device and determine whether we might attach a device to
 1909  * it.
 1910  */
 1911 static ACPI_STATUS
 1912 acpi_probe_child(ACPI_HANDLE handle, UINT32 level, void *context, void **status)
 1913 {
 1914     struct acpi_prw_data prw;
 1915     ACPI_OBJECT_TYPE type;
 1916     ACPI_HANDLE h;
 1917     device_t bus, child;
 1918     char *handle_str;
 1919     int order;
 1920 
 1921     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 1922 
 1923     if (acpi_disabled("children"))
 1924         return_ACPI_STATUS (AE_OK);
 1925 
 1926     /* Skip this device if we think we'll have trouble with it. */
 1927     if (acpi_avoid(handle))
 1928         return_ACPI_STATUS (AE_OK);
 1929 
 1930     bus = (device_t)context;
 1931     if (ACPI_SUCCESS(AcpiGetType(handle, &type))) {
 1932         handle_str = acpi_name(handle);
 1933         switch (type) {
 1934         case ACPI_TYPE_DEVICE:
 1935             /*
 1936              * Since we scan from \, be sure to skip system scope objects.
 1937              * \_SB_ and \_TZ_ are defined in ACPICA as devices to work around
 1938              * BIOS bugs.  For example, \_SB_ is to allow \_SB_._INI to be run
 1939              * during the intialization and \_TZ_ is to support Notify() on it.
 1940              */
 1941             if (strcmp(handle_str, "\\_SB_") == 0 ||
 1942                 strcmp(handle_str, "\\_TZ_") == 0)
 1943                 break;
 1944             if (acpi_parse_prw(handle, &prw) == 0)
 1945                 AcpiSetupGpeForWake(handle, prw.gpe_handle, prw.gpe_bit);
 1946 
 1947             /*
 1948              * Ignore devices that do not have a _HID or _CID.  They should
 1949              * be discovered by other buses (e.g. the PCI bus driver).
 1950              */
 1951             if (!acpi_has_hid(handle))
 1952                 break;
 1953             /* FALLTHROUGH */
 1954         case ACPI_TYPE_PROCESSOR:
 1955         case ACPI_TYPE_THERMAL:
 1956         case ACPI_TYPE_POWER:
 1957             /* 
 1958              * Create a placeholder device for this node.  Sort the
 1959              * placeholder so that the probe/attach passes will run
 1960              * breadth-first.  Orders less than ACPI_DEV_BASE_ORDER
 1961              * are reserved for special objects (i.e., system
 1962              * resources).
 1963              */
 1964             ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "scanning '%s'\n", handle_str));
 1965             order = level * 10 + ACPI_DEV_BASE_ORDER;
 1966             acpi_probe_order(handle, &order);
 1967             child = BUS_ADD_CHILD(bus, order, NULL, -1);
 1968             if (child == NULL)
 1969                 break;
 1970 
 1971             /* Associate the handle with the device_t and vice versa. */
 1972             acpi_set_handle(child, handle);
 1973             AcpiAttachData(handle, acpi_fake_objhandler, child);
 1974 
 1975             /*
 1976              * Check that the device is present.  If it's not present,
 1977              * leave it disabled (so that we have a device_t attached to
 1978              * the handle, but we don't probe it).
 1979              *
 1980              * XXX PCI link devices sometimes report "present" but not
 1981              * "functional" (i.e. if disabled).  Go ahead and probe them
 1982              * anyway since we may enable them later.
 1983              */
 1984             if (type == ACPI_TYPE_DEVICE && !acpi_DeviceIsPresent(child)) {
 1985                 /* Never disable PCI link devices. */
 1986                 if (acpi_MatchHid(handle, "PNP0C0F"))
 1987                     break;
 1988                 /*
 1989                  * Docking stations should remain enabled since the system
 1990                  * may be undocked at boot.
 1991                  */
 1992                 if (ACPI_SUCCESS(AcpiGetHandle(handle, "_DCK", &h)))
 1993                     break;
 1994 
 1995                 device_disable(child);
 1996                 break;
 1997             }
 1998 
 1999             /*
 2000              * Get the device's resource settings and attach them.
 2001              * Note that if the device has _PRS but no _CRS, we need
 2002              * to decide when it's appropriate to try to configure the
 2003              * device.  Ignore the return value here; it's OK for the
 2004              * device not to have any resources.
 2005              */
 2006             acpi_parse_resources(child, handle, &acpi_res_parse_set, NULL);
 2007             break;
 2008         }
 2009     }
 2010 
 2011     return_ACPI_STATUS (AE_OK);
 2012 }
 2013 
 2014 /*
 2015  * AcpiAttachData() requires an object handler but never uses it.  This is a
 2016  * placeholder object handler so we can store a device_t in an ACPI_HANDLE.
 2017  */
 2018 void
 2019 acpi_fake_objhandler(ACPI_HANDLE h, void *data)
 2020 {
 2021 }
 2022 
 2023 static void
 2024 acpi_shutdown_final(void *arg, int howto)
 2025 {
 2026     struct acpi_softc *sc = (struct acpi_softc *)arg;
 2027     register_t intr;
 2028     ACPI_STATUS status;
 2029 
 2030     /*
 2031      * XXX Shutdown code should only run on the BSP (cpuid 0).
 2032      * Some chipsets do not power off the system correctly if called from
 2033      * an AP.
 2034      */
 2035     if ((howto & RB_POWEROFF) != 0) {
 2036         status = AcpiEnterSleepStatePrep(ACPI_STATE_S5);
 2037         if (ACPI_FAILURE(status)) {
 2038             device_printf(sc->acpi_dev, "AcpiEnterSleepStatePrep failed - %s\n",
 2039                 AcpiFormatException(status));
 2040             return;
 2041         }
 2042         device_printf(sc->acpi_dev, "Powering system off\n");
 2043         intr = intr_disable();
 2044         status = AcpiEnterSleepState(ACPI_STATE_S5);
 2045         if (ACPI_FAILURE(status)) {
 2046             intr_restore(intr);
 2047             device_printf(sc->acpi_dev, "power-off failed - %s\n",
 2048                 AcpiFormatException(status));
 2049         } else {
 2050             DELAY(1000000);
 2051             intr_restore(intr);
 2052             device_printf(sc->acpi_dev, "power-off failed - timeout\n");
 2053         }
 2054     } else if ((howto & RB_HALT) == 0 && sc->acpi_handle_reboot) {
 2055         /* Reboot using the reset register. */
 2056         status = AcpiReset();
 2057         if (ACPI_SUCCESS(status)) {
 2058             DELAY(1000000);
 2059             device_printf(sc->acpi_dev, "reset failed - timeout\n");
 2060         } else if (status != AE_NOT_EXIST)
 2061             device_printf(sc->acpi_dev, "reset failed - %s\n",
 2062                 AcpiFormatException(status));
 2063     } else if (sc->acpi_do_disable && panicstr == NULL) {
 2064         /*
 2065          * Only disable ACPI if the user requested.  On some systems, writing
 2066          * the disable value to SMI_CMD hangs the system.
 2067          */
 2068         device_printf(sc->acpi_dev, "Shutting down\n");
 2069         AcpiTerminate();
 2070     }
 2071 }
 2072 
 2073 static void
 2074 acpi_enable_fixed_events(struct acpi_softc *sc)
 2075 {
 2076     static int  first_time = 1;
 2077 
 2078     /* Enable and clear fixed events and install handlers. */
 2079     if ((AcpiGbl_FADT.Flags & ACPI_FADT_POWER_BUTTON) == 0) {
 2080         AcpiClearEvent(ACPI_EVENT_POWER_BUTTON);
 2081         AcpiInstallFixedEventHandler(ACPI_EVENT_POWER_BUTTON,
 2082                                      acpi_event_power_button_sleep, sc);
 2083         if (first_time)
 2084             device_printf(sc->acpi_dev, "Power Button (fixed)\n");
 2085     }
 2086     if ((AcpiGbl_FADT.Flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
 2087         AcpiClearEvent(ACPI_EVENT_SLEEP_BUTTON);
 2088         AcpiInstallFixedEventHandler(ACPI_EVENT_SLEEP_BUTTON,
 2089                                      acpi_event_sleep_button_sleep, sc);
 2090         if (first_time)
 2091             device_printf(sc->acpi_dev, "Sleep Button (fixed)\n");
 2092     }
 2093 
 2094     first_time = 0;
 2095 }
 2096 
 2097 /*
 2098  * Returns true if the device is actually present and should
 2099  * be attached to.  This requires the present, enabled, UI-visible 
 2100  * and diagnostics-passed bits to be set.
 2101  */
 2102 BOOLEAN
 2103 acpi_DeviceIsPresent(device_t dev)
 2104 {
 2105     ACPI_DEVICE_INFO    *devinfo;
 2106     ACPI_HANDLE         h;
 2107     BOOLEAN             present;
 2108 
 2109     if ((h = acpi_get_handle(dev)) == NULL ||
 2110         ACPI_FAILURE(AcpiGetObjectInfo(h, &devinfo)))
 2111         return (FALSE);
 2112 
 2113     /* If no _STA method, must be present */
 2114     present = (devinfo->Valid & ACPI_VALID_STA) == 0 ||
 2115         ACPI_DEVICE_PRESENT(devinfo->CurrentStatus) ? TRUE : FALSE;
 2116 
 2117     AcpiOsFree(devinfo);
 2118     return (present);
 2119 }
 2120 
 2121 /*
 2122  * Returns true if the battery is actually present and inserted.
 2123  */
 2124 BOOLEAN
 2125 acpi_BatteryIsPresent(device_t dev)
 2126 {
 2127     ACPI_DEVICE_INFO    *devinfo;
 2128     ACPI_HANDLE         h;
 2129     BOOLEAN             present;
 2130 
 2131     if ((h = acpi_get_handle(dev)) == NULL ||
 2132         ACPI_FAILURE(AcpiGetObjectInfo(h, &devinfo)))
 2133         return (FALSE);
 2134 
 2135     /* If no _STA method, must be present */
 2136     present = (devinfo->Valid & ACPI_VALID_STA) == 0 ||
 2137         ACPI_BATTERY_PRESENT(devinfo->CurrentStatus) ? TRUE : FALSE;
 2138 
 2139     AcpiOsFree(devinfo);
 2140     return (present);
 2141 }
 2142 
 2143 /*
 2144  * Returns true if a device has at least one valid device ID.
 2145  */
 2146 static BOOLEAN
 2147 acpi_has_hid(ACPI_HANDLE h)
 2148 {
 2149     ACPI_DEVICE_INFO    *devinfo;
 2150     BOOLEAN             ret;
 2151 
 2152     if (h == NULL ||
 2153         ACPI_FAILURE(AcpiGetObjectInfo(h, &devinfo)))
 2154         return (FALSE);
 2155 
 2156     ret = FALSE;
 2157     if ((devinfo->Valid & ACPI_VALID_HID) != 0)
 2158         ret = TRUE;
 2159     else if ((devinfo->Valid & ACPI_VALID_CID) != 0)
 2160         if (devinfo->CompatibleIdList.Count > 0)
 2161             ret = TRUE;
 2162 
 2163     AcpiOsFree(devinfo);
 2164     return (ret);
 2165 }
 2166 
 2167 /*
 2168  * Match a HID string against a handle
 2169  */
 2170 BOOLEAN
 2171 acpi_MatchHid(ACPI_HANDLE h, const char *hid) 
 2172 {
 2173     ACPI_DEVICE_INFO    *devinfo;
 2174     BOOLEAN             ret;
 2175     int                 i;
 2176 
 2177     if (hid == NULL || h == NULL ||
 2178         ACPI_FAILURE(AcpiGetObjectInfo(h, &devinfo)))
 2179         return (FALSE);
 2180 
 2181     ret = FALSE;
 2182     if ((devinfo->Valid & ACPI_VALID_HID) != 0 &&
 2183         strcmp(hid, devinfo->HardwareId.String) == 0)
 2184             ret = TRUE;
 2185     else if ((devinfo->Valid & ACPI_VALID_CID) != 0)
 2186         for (i = 0; i < devinfo->CompatibleIdList.Count; i++) {
 2187             if (strcmp(hid, devinfo->CompatibleIdList.Ids[i].String) == 0) {
 2188                 ret = TRUE;
 2189                 break;
 2190             }
 2191         }
 2192 
 2193     AcpiOsFree(devinfo);
 2194     return (ret);
 2195 }
 2196 
 2197 /*
 2198  * Return the handle of a named object within our scope, ie. that of (parent)
 2199  * or one if its parents.
 2200  */
 2201 ACPI_STATUS
 2202 acpi_GetHandleInScope(ACPI_HANDLE parent, char *path, ACPI_HANDLE *result)
 2203 {
 2204     ACPI_HANDLE         r;
 2205     ACPI_STATUS         status;
 2206 
 2207     /* Walk back up the tree to the root */
 2208     for (;;) {
 2209         status = AcpiGetHandle(parent, path, &r);
 2210         if (ACPI_SUCCESS(status)) {
 2211             *result = r;
 2212             return (AE_OK);
 2213         }
 2214         /* XXX Return error here? */
 2215         if (status != AE_NOT_FOUND)
 2216             return (AE_OK);
 2217         if (ACPI_FAILURE(AcpiGetParent(parent, &r)))
 2218             return (AE_NOT_FOUND);
 2219         parent = r;
 2220     }
 2221 }
 2222 
 2223 /*
 2224  * Allocate a buffer with a preset data size.
 2225  */
 2226 ACPI_BUFFER *
 2227 acpi_AllocBuffer(int size)
 2228 {
 2229     ACPI_BUFFER *buf;
 2230 
 2231     if ((buf = malloc(size + sizeof(*buf), M_ACPIDEV, M_NOWAIT)) == NULL)
 2232         return (NULL);
 2233     buf->Length = size;
 2234     buf->Pointer = (void *)(buf + 1);
 2235     return (buf);
 2236 }
 2237 
 2238 ACPI_STATUS
 2239 acpi_SetInteger(ACPI_HANDLE handle, char *path, UINT32 number)
 2240 {
 2241     ACPI_OBJECT arg1;
 2242     ACPI_OBJECT_LIST args;
 2243 
 2244     arg1.Type = ACPI_TYPE_INTEGER;
 2245     arg1.Integer.Value = number;
 2246     args.Count = 1;
 2247     args.Pointer = &arg1;
 2248 
 2249     return (AcpiEvaluateObject(handle, path, &args, NULL));
 2250 }
 2251 
 2252 /*
 2253  * Evaluate a path that should return an integer.
 2254  */
 2255 ACPI_STATUS
 2256 acpi_GetInteger(ACPI_HANDLE handle, char *path, UINT32 *number)
 2257 {
 2258     ACPI_STATUS status;
 2259     ACPI_BUFFER buf;
 2260     ACPI_OBJECT param;
 2261 
 2262     if (handle == NULL)
 2263         handle = ACPI_ROOT_OBJECT;
 2264 
 2265     /*
 2266      * Assume that what we've been pointed at is an Integer object, or
 2267      * a method that will return an Integer.
 2268      */
 2269     buf.Pointer = &param;
 2270     buf.Length = sizeof(param);
 2271     status = AcpiEvaluateObject(handle, path, NULL, &buf);
 2272     if (ACPI_SUCCESS(status)) {
 2273         if (param.Type == ACPI_TYPE_INTEGER)
 2274             *number = param.Integer.Value;
 2275         else
 2276             status = AE_TYPE;
 2277     }
 2278 
 2279     /* 
 2280      * In some applications, a method that's expected to return an Integer
 2281      * may instead return a Buffer (probably to simplify some internal
 2282      * arithmetic).  We'll try to fetch whatever it is, and if it's a Buffer,
 2283      * convert it into an Integer as best we can.
 2284      *
 2285      * This is a hack.
 2286      */
 2287     if (status == AE_BUFFER_OVERFLOW) {
 2288         if ((buf.Pointer = AcpiOsAllocate(buf.Length)) == NULL) {
 2289             status = AE_NO_MEMORY;
 2290         } else {
 2291             status = AcpiEvaluateObject(handle, path, NULL, &buf);
 2292             if (ACPI_SUCCESS(status))
 2293                 status = acpi_ConvertBufferToInteger(&buf, number);
 2294             AcpiOsFree(buf.Pointer);
 2295         }
 2296     }
 2297     return (status);
 2298 }
 2299 
 2300 ACPI_STATUS
 2301 acpi_ConvertBufferToInteger(ACPI_BUFFER *bufp, UINT32 *number)
 2302 {
 2303     ACPI_OBJECT *p;
 2304     UINT8       *val;
 2305     int         i;
 2306 
 2307     p = (ACPI_OBJECT *)bufp->Pointer;
 2308     if (p->Type == ACPI_TYPE_INTEGER) {
 2309         *number = p->Integer.Value;
 2310         return (AE_OK);
 2311     }
 2312     if (p->Type != ACPI_TYPE_BUFFER)
 2313         return (AE_TYPE);
 2314     if (p->Buffer.Length > sizeof(int))
 2315         return (AE_BAD_DATA);
 2316 
 2317     *number = 0;
 2318     val = p->Buffer.Pointer;
 2319     for (i = 0; i < p->Buffer.Length; i++)
 2320         *number += val[i] << (i * 8);
 2321     return (AE_OK);
 2322 }
 2323 
 2324 /*
 2325  * Iterate over the elements of an a package object, calling the supplied
 2326  * function for each element.
 2327  *
 2328  * XXX possible enhancement might be to abort traversal on error.
 2329  */
 2330 ACPI_STATUS
 2331 acpi_ForeachPackageObject(ACPI_OBJECT *pkg,
 2332         void (*func)(ACPI_OBJECT *comp, void *arg), void *arg)
 2333 {
 2334     ACPI_OBJECT *comp;
 2335     int         i;
 2336 
 2337     if (pkg == NULL || pkg->Type != ACPI_TYPE_PACKAGE)
 2338         return (AE_BAD_PARAMETER);
 2339 
 2340     /* Iterate over components */
 2341     i = 0;
 2342     comp = pkg->Package.Elements;
 2343     for (; i < pkg->Package.Count; i++, comp++)
 2344         func(comp, arg);
 2345 
 2346     return (AE_OK);
 2347 }
 2348 
 2349 /*
 2350  * Find the (index)th resource object in a set.
 2351  */
 2352 ACPI_STATUS
 2353 acpi_FindIndexedResource(ACPI_BUFFER *buf, int index, ACPI_RESOURCE **resp)
 2354 {
 2355     ACPI_RESOURCE       *rp;
 2356     int                 i;
 2357 
 2358     rp = (ACPI_RESOURCE *)buf->Pointer;
 2359     i = index;
 2360     while (i-- > 0) {
 2361         /* Range check */
 2362         if (rp > (ACPI_RESOURCE *)((u_int8_t *)buf->Pointer + buf->Length))
 2363             return (AE_BAD_PARAMETER);
 2364 
 2365         /* Check for terminator */
 2366         if (rp->Type == ACPI_RESOURCE_TYPE_END_TAG || rp->Length == 0)
 2367             return (AE_NOT_FOUND);
 2368         rp = ACPI_NEXT_RESOURCE(rp);
 2369     }
 2370     if (resp != NULL)
 2371         *resp = rp;
 2372 
 2373     return (AE_OK);
 2374 }
 2375 
 2376 /*
 2377  * Append an ACPI_RESOURCE to an ACPI_BUFFER.
 2378  *
 2379  * Given a pointer to an ACPI_RESOURCE structure, expand the ACPI_BUFFER
 2380  * provided to contain it.  If the ACPI_BUFFER is empty, allocate a sensible
 2381  * backing block.  If the ACPI_RESOURCE is NULL, return an empty set of
 2382  * resources.
 2383  */
 2384 #define ACPI_INITIAL_RESOURCE_BUFFER_SIZE       512
 2385 
 2386 ACPI_STATUS
 2387 acpi_AppendBufferResource(ACPI_BUFFER *buf, ACPI_RESOURCE *res)
 2388 {
 2389     ACPI_RESOURCE       *rp;
 2390     void                *newp;
 2391 
 2392     /* Initialise the buffer if necessary. */
 2393     if (buf->Pointer == NULL) {
 2394         buf->Length = ACPI_INITIAL_RESOURCE_BUFFER_SIZE;
 2395         if ((buf->Pointer = AcpiOsAllocate(buf->Length)) == NULL)
 2396             return (AE_NO_MEMORY);
 2397         rp = (ACPI_RESOURCE *)buf->Pointer;
 2398         rp->Type = ACPI_RESOURCE_TYPE_END_TAG;
 2399         rp->Length = ACPI_RS_SIZE_MIN;
 2400     }
 2401     if (res == NULL)
 2402         return (AE_OK);
 2403 
 2404     /*
 2405      * Scan the current buffer looking for the terminator.
 2406      * This will either find the terminator or hit the end
 2407      * of the buffer and return an error.
 2408      */
 2409     rp = (ACPI_RESOURCE *)buf->Pointer;
 2410     for (;;) {
 2411         /* Range check, don't go outside the buffer */
 2412         if (rp >= (ACPI_RESOURCE *)((u_int8_t *)buf->Pointer + buf->Length))
 2413             return (AE_BAD_PARAMETER);
 2414         if (rp->Type == ACPI_RESOURCE_TYPE_END_TAG || rp->Length == 0)
 2415             break;
 2416         rp = ACPI_NEXT_RESOURCE(rp);
 2417     }
 2418 
 2419     /*
 2420      * Check the size of the buffer and expand if required.
 2421      *
 2422      * Required size is:
 2423      *  size of existing resources before terminator + 
 2424      *  size of new resource and header +
 2425      *  size of terminator.
 2426      *
 2427      * Note that this loop should really only run once, unless
 2428      * for some reason we are stuffing a *really* huge resource.
 2429      */
 2430     while ((((u_int8_t *)rp - (u_int8_t *)buf->Pointer) + 
 2431             res->Length + ACPI_RS_SIZE_NO_DATA +
 2432             ACPI_RS_SIZE_MIN) >= buf->Length) {
 2433         if ((newp = AcpiOsAllocate(buf->Length * 2)) == NULL)
 2434             return (AE_NO_MEMORY);
 2435         bcopy(buf->Pointer, newp, buf->Length);
 2436         rp = (ACPI_RESOURCE *)((u_int8_t *)newp +
 2437                                ((u_int8_t *)rp - (u_int8_t *)buf->Pointer));
 2438         AcpiOsFree(buf->Pointer);
 2439         buf->Pointer = newp;
 2440         buf->Length += buf->Length;
 2441     }
 2442 
 2443     /* Insert the new resource. */
 2444     bcopy(res, rp, res->Length + ACPI_RS_SIZE_NO_DATA);
 2445 
 2446     /* And add the terminator. */
 2447     rp = ACPI_NEXT_RESOURCE(rp);
 2448     rp->Type = ACPI_RESOURCE_TYPE_END_TAG;
 2449     rp->Length = ACPI_RS_SIZE_MIN;
 2450 
 2451     return (AE_OK);
 2452 }
 2453 
 2454 ACPI_STATUS
 2455 acpi_EvaluateOSC(ACPI_HANDLE handle, uint8_t *uuid, int revision, int count,
 2456     uint32_t *caps_in, uint32_t *caps_out, bool query)
 2457 {
 2458         ACPI_OBJECT arg[4], *ret;
 2459         ACPI_OBJECT_LIST arglist;
 2460         ACPI_BUFFER buf;
 2461         ACPI_STATUS status;
 2462 
 2463         arglist.Pointer = arg;
 2464         arglist.Count = 4;
 2465         arg[0].Type = ACPI_TYPE_BUFFER;
 2466         arg[0].Buffer.Length = ACPI_UUID_LENGTH;
 2467         arg[0].Buffer.Pointer = uuid;
 2468         arg[1].Type = ACPI_TYPE_INTEGER;
 2469         arg[1].Integer.Value = revision;
 2470         arg[2].Type = ACPI_TYPE_INTEGER;
 2471         arg[2].Integer.Value = count;
 2472         arg[3].Type = ACPI_TYPE_BUFFER;
 2473         arg[3].Buffer.Length = count * sizeof(*caps_in);
 2474         arg[3].Buffer.Pointer = (uint8_t *)caps_in;
 2475         caps_in[0] = query ? 1 : 0;
 2476         buf.Pointer = NULL;
 2477         buf.Length = ACPI_ALLOCATE_BUFFER;
 2478         status = AcpiEvaluateObjectTyped(handle, "_OSC", &arglist, &buf,
 2479             ACPI_TYPE_BUFFER);
 2480         if (ACPI_FAILURE(status))
 2481                 return (status);
 2482         if (caps_out != NULL) {
 2483                 ret = buf.Pointer;
 2484                 if (ret->Buffer.Length != count * sizeof(*caps_out)) {
 2485                         AcpiOsFree(buf.Pointer);
 2486                         return (AE_BUFFER_OVERFLOW);
 2487                 }
 2488                 bcopy(ret->Buffer.Pointer, caps_out, ret->Buffer.Length);
 2489         }
 2490         AcpiOsFree(buf.Pointer);
 2491         return (status);
 2492 }
 2493 
 2494 /*
 2495  * Set interrupt model.
 2496  */
 2497 ACPI_STATUS
 2498 acpi_SetIntrModel(int model)
 2499 {
 2500 
 2501     return (acpi_SetInteger(ACPI_ROOT_OBJECT, "_PIC", model));
 2502 }
 2503 
 2504 /*
 2505  * Walk subtables of a table and call a callback routine for each
 2506  * subtable.  The caller should provide the first subtable and a
 2507  * pointer to the end of the table.  This can be used to walk tables
 2508  * such as MADT and SRAT that use subtable entries.
 2509  */
 2510 void
 2511 acpi_walk_subtables(void *first, void *end, acpi_subtable_handler *handler,
 2512     void *arg)
 2513 {
 2514     ACPI_SUBTABLE_HEADER *entry;
 2515 
 2516     for (entry = first; (void *)entry < end; ) {
 2517         /* Avoid an infinite loop if we hit a bogus entry. */
 2518         if (entry->Length < sizeof(ACPI_SUBTABLE_HEADER))
 2519             return;
 2520 
 2521         handler(entry, arg);
 2522         entry = ACPI_ADD_PTR(ACPI_SUBTABLE_HEADER, entry, entry->Length);
 2523     }
 2524 }
 2525 
 2526 /*
 2527  * DEPRECATED.  This interface has serious deficiencies and will be
 2528  * removed.
 2529  *
 2530  * Immediately enter the sleep state.  In the old model, acpiconf(8) ran
 2531  * rc.suspend and rc.resume so we don't have to notify devd(8) to do this.
 2532  */
 2533 ACPI_STATUS
 2534 acpi_SetSleepState(struct acpi_softc *sc, int state)
 2535 {
 2536     static int once;
 2537 
 2538     if (!once) {
 2539         device_printf(sc->acpi_dev,
 2540 "warning: acpi_SetSleepState() deprecated, need to update your software\n");
 2541         once = 1;
 2542     }
 2543     return (acpi_EnterSleepState(sc, state));
 2544 }
 2545 
 2546 #if defined(__amd64__) || defined(__i386__)
 2547 static void
 2548 acpi_sleep_force_task(void *context)
 2549 {
 2550     struct acpi_softc *sc = (struct acpi_softc *)context;
 2551 
 2552     if (ACPI_FAILURE(acpi_EnterSleepState(sc, sc->acpi_next_sstate)))
 2553         device_printf(sc->acpi_dev, "force sleep state S%d failed\n",
 2554             sc->acpi_next_sstate);
 2555 }
 2556 
 2557 static void
 2558 acpi_sleep_force(void *arg)
 2559 {
 2560     struct acpi_softc *sc = (struct acpi_softc *)arg;
 2561 
 2562     device_printf(sc->acpi_dev,
 2563         "suspend request timed out, forcing sleep now\n");
 2564     /*
 2565      * XXX Suspending from callout cause the freeze in DEVICE_SUSPEND().
 2566      * Suspend from acpi_task thread in stead.
 2567      */
 2568     if (ACPI_FAILURE(AcpiOsExecute(OSL_NOTIFY_HANDLER,
 2569         acpi_sleep_force_task, sc)))
 2570         device_printf(sc->acpi_dev, "AcpiOsExecute() for sleeping failed\n");
 2571 }
 2572 #endif
 2573 
 2574 /*
 2575  * Request that the system enter the given suspend state.  All /dev/apm
 2576  * devices and devd(8) will be notified.  Userland then has a chance to
 2577  * save state and acknowledge the request.  The system sleeps once all
 2578  * acks are in.
 2579  */
 2580 int
 2581 acpi_ReqSleepState(struct acpi_softc *sc, int state)
 2582 {
 2583 #if defined(__amd64__) || defined(__i386__)
 2584     struct apm_clone_data *clone;
 2585     ACPI_STATUS status;
 2586 
 2587     if (state < ACPI_STATE_S1 || state > ACPI_S_STATES_MAX)
 2588         return (EINVAL);
 2589     if (!acpi_sleep_states[state])
 2590         return (EOPNOTSUPP);
 2591 
 2592     /*
 2593      * If a reboot/shutdown/suspend request is already in progress or
 2594      * suspend is blocked due to an upcoming shutdown, just return.
 2595      */
 2596     if (rebooting || sc->acpi_next_sstate != 0 || suspend_blocked) {
 2597         return (0);
 2598     }
 2599 
 2600     /* Wait until sleep is enabled. */
 2601     while (sc->acpi_sleep_disabled) {
 2602         AcpiOsSleep(1000);
 2603     }
 2604 
 2605     ACPI_LOCK(acpi);
 2606 
 2607     sc->acpi_next_sstate = state;
 2608 
 2609     /* S5 (soft-off) should be entered directly with no waiting. */
 2610     if (state == ACPI_STATE_S5) {
 2611         ACPI_UNLOCK(acpi);
 2612         status = acpi_EnterSleepState(sc, state);
 2613         return (ACPI_SUCCESS(status) ? 0 : ENXIO);
 2614     }
 2615 
 2616     /* Record the pending state and notify all apm devices. */
 2617     STAILQ_FOREACH(clone, &sc->apm_cdevs, entries) {
 2618         clone->notify_status = APM_EV_NONE;
 2619         if ((clone->flags & ACPI_EVF_DEVD) == 0) {
 2620             selwakeuppri(&clone->sel_read, PZERO);
 2621             KNOTE_LOCKED(&clone->sel_read.si_note, 0);
 2622         }
 2623     }
 2624 
 2625     /* If devd(8) is not running, immediately enter the sleep state. */
 2626     if (!devctl_process_running()) {
 2627         ACPI_UNLOCK(acpi);
 2628         status = acpi_EnterSleepState(sc, state);
 2629         return (ACPI_SUCCESS(status) ? 0 : ENXIO);
 2630     }
 2631 
 2632     /*
 2633      * Set a timeout to fire if userland doesn't ack the suspend request
 2634      * in time.  This way we still eventually go to sleep if we were
 2635      * overheating or running low on battery, even if userland is hung.
 2636      * We cancel this timeout once all userland acks are in or the
 2637      * suspend request is aborted.
 2638      */
 2639     callout_reset(&sc->susp_force_to, 10 * hz, acpi_sleep_force, sc);
 2640     ACPI_UNLOCK(acpi);
 2641 
 2642     /* Now notify devd(8) also. */
 2643     acpi_UserNotify("Suspend", ACPI_ROOT_OBJECT, state);
 2644 
 2645     return (0);
 2646 #else
 2647     /* This platform does not support acpi suspend/resume. */
 2648     return (EOPNOTSUPP);
 2649 #endif
 2650 }
 2651 
 2652 /*
 2653  * Acknowledge (or reject) a pending sleep state.  The caller has
 2654  * prepared for suspend and is now ready for it to proceed.  If the
 2655  * error argument is non-zero, it indicates suspend should be cancelled
 2656  * and gives an errno value describing why.  Once all votes are in,
 2657  * we suspend the system.
 2658  */
 2659 int
 2660 acpi_AckSleepState(struct apm_clone_data *clone, int error)
 2661 {
 2662 #if defined(__amd64__) || defined(__i386__)
 2663     struct acpi_softc *sc;
 2664     int ret, sleeping;
 2665 
 2666     /* If no pending sleep state, return an error. */
 2667     ACPI_LOCK(acpi);
 2668     sc = clone->acpi_sc;
 2669     if (sc->acpi_next_sstate == 0) {
 2670         ACPI_UNLOCK(acpi);
 2671         return (ENXIO);
 2672     }
 2673 
 2674     /* Caller wants to abort suspend process. */
 2675     if (error) {
 2676         sc->acpi_next_sstate = 0;
 2677         callout_stop(&sc->susp_force_to);
 2678         device_printf(sc->acpi_dev,
 2679             "listener on %s cancelled the pending suspend\n",
 2680             devtoname(clone->cdev));
 2681         ACPI_UNLOCK(acpi);
 2682         return (0);
 2683     }
 2684 
 2685     /*
 2686      * Mark this device as acking the suspend request.  Then, walk through
 2687      * all devices, seeing if they agree yet.  We only count devices that
 2688      * are writable since read-only devices couldn't ack the request.
 2689      */
 2690     sleeping = TRUE;
 2691     clone->notify_status = APM_EV_ACKED;
 2692     STAILQ_FOREACH(clone, &sc->apm_cdevs, entries) {
 2693         if ((clone->flags & ACPI_EVF_WRITE) != 0 &&
 2694             clone->notify_status != APM_EV_ACKED) {
 2695             sleeping = FALSE;
 2696             break;
 2697         }
 2698     }
 2699 
 2700     /* If all devices have voted "yes", we will suspend now. */
 2701     if (sleeping)
 2702         callout_stop(&sc->susp_force_to);
 2703     ACPI_UNLOCK(acpi);
 2704     ret = 0;
 2705     if (sleeping) {
 2706         if (ACPI_FAILURE(acpi_EnterSleepState(sc, sc->acpi_next_sstate)))
 2707                 ret = ENODEV;
 2708     }
 2709     return (ret);
 2710 #else
 2711     /* This platform does not support acpi suspend/resume. */
 2712     return (EOPNOTSUPP);
 2713 #endif
 2714 }
 2715 
 2716 static void
 2717 acpi_sleep_enable(void *arg)
 2718 {
 2719     struct acpi_softc   *sc = (struct acpi_softc *)arg;
 2720 
 2721     /* Reschedule if the system is not fully up and running. */
 2722     if (!AcpiGbl_SystemAwakeAndRunning) {
 2723         timeout(acpi_sleep_enable, sc, hz * ACPI_MINIMUM_AWAKETIME);
 2724         return;
 2725     }
 2726 
 2727     ACPI_LOCK(acpi);
 2728     sc->acpi_sleep_disabled = FALSE;
 2729     ACPI_UNLOCK(acpi);
 2730 }
 2731 
 2732 static ACPI_STATUS
 2733 acpi_sleep_disable(struct acpi_softc *sc)
 2734 {
 2735     ACPI_STATUS         status;
 2736 
 2737     /* Fail if the system is not fully up and running. */
 2738     if (!AcpiGbl_SystemAwakeAndRunning)
 2739         return (AE_ERROR);
 2740 
 2741     ACPI_LOCK(acpi);
 2742     status = sc->acpi_sleep_disabled ? AE_ERROR : AE_OK;
 2743     sc->acpi_sleep_disabled = TRUE;
 2744     ACPI_UNLOCK(acpi);
 2745 
 2746     return (status);
 2747 }
 2748 
 2749 enum acpi_sleep_state {
 2750     ACPI_SS_NONE,
 2751     ACPI_SS_GPE_SET,
 2752     ACPI_SS_DEV_SUSPEND,
 2753     ACPI_SS_SLP_PREP,
 2754     ACPI_SS_SLEPT,
 2755 };
 2756 
 2757 /*
 2758  * Enter the desired system sleep state.
 2759  *
 2760  * Currently we support S1-S5 but S4 is only S4BIOS
 2761  */
 2762 static ACPI_STATUS
 2763 acpi_EnterSleepState(struct acpi_softc *sc, int state)
 2764 {
 2765     register_t intr;
 2766     ACPI_STATUS status;
 2767     ACPI_EVENT_STATUS power_button_status;
 2768     enum acpi_sleep_state slp_state;
 2769     int sleep_result;
 2770 
 2771     ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, state);
 2772 
 2773     if (state < ACPI_STATE_S1 || state > ACPI_S_STATES_MAX)
 2774         return_ACPI_STATUS (AE_BAD_PARAMETER);
 2775     if (!acpi_sleep_states[state]) {
 2776         device_printf(sc->acpi_dev, "Sleep state S%d not supported by BIOS\n",
 2777             state);
 2778         return (AE_SUPPORT);
 2779     }
 2780 
 2781     /* Re-entry once we're suspending is not allowed. */
 2782     status = acpi_sleep_disable(sc);
 2783     if (ACPI_FAILURE(status)) {
 2784         device_printf(sc->acpi_dev,
 2785             "suspend request ignored (not ready yet)\n");
 2786         return (status);
 2787     }
 2788 
 2789     if (state == ACPI_STATE_S5) {
 2790         /*
 2791          * Shut down cleanly and power off.  This will call us back through the
 2792          * shutdown handlers.
 2793          */
 2794         shutdown_nice(RB_POWEROFF);
 2795         return_ACPI_STATUS (AE_OK);
 2796     }
 2797 
 2798     EVENTHANDLER_INVOKE(power_suspend_early);
 2799     stop_all_proc();
 2800     EVENTHANDLER_INVOKE(power_suspend);
 2801 
 2802     if (smp_started) {
 2803         thread_lock(curthread);
 2804         sched_bind(curthread, 0);
 2805         thread_unlock(curthread);
 2806     }
 2807 
 2808     /*
 2809      * Be sure to hold Giant across DEVICE_SUSPEND/RESUME since non-MPSAFE
 2810      * drivers need this.
 2811      */
 2812     mtx_lock(&Giant);
 2813 
 2814     slp_state = ACPI_SS_NONE;
 2815 
 2816     sc->acpi_sstate = state;
 2817 
 2818     /* Enable any GPEs as appropriate and requested by the user. */
 2819     acpi_wake_prep_walk(state);
 2820     slp_state = ACPI_SS_GPE_SET;
 2821 
 2822     /*
 2823      * Inform all devices that we are going to sleep.  If at least one
 2824      * device fails, DEVICE_SUSPEND() automatically resumes the tree.
 2825      *
 2826      * XXX Note that a better two-pass approach with a 'veto' pass
 2827      * followed by a "real thing" pass would be better, but the current
 2828      * bus interface does not provide for this.
 2829      */
 2830     if (DEVICE_SUSPEND(root_bus) != 0) {
 2831         device_printf(sc->acpi_dev, "device_suspend failed\n");
 2832         goto backout;
 2833     }
 2834     slp_state = ACPI_SS_DEV_SUSPEND;
 2835 
 2836     /* If testing device suspend only, back out of everything here. */
 2837     if (acpi_susp_bounce)
 2838         goto backout;
 2839 
 2840     status = AcpiEnterSleepStatePrep(state);
 2841     if (ACPI_FAILURE(status)) {
 2842         device_printf(sc->acpi_dev, "AcpiEnterSleepStatePrep failed - %s\n",
 2843                       AcpiFormatException(status));
 2844         goto backout;
 2845     }
 2846     slp_state = ACPI_SS_SLP_PREP;
 2847 
 2848     if (sc->acpi_sleep_delay > 0)
 2849         DELAY(sc->acpi_sleep_delay * 1000000);
 2850 
 2851     intr = intr_disable();
 2852     if (state != ACPI_STATE_S1) {
 2853         sleep_result = acpi_sleep_machdep(sc, state);
 2854         acpi_wakeup_machdep(sc, state, sleep_result, 0);
 2855 
 2856         /*
 2857          * XXX According to ACPI specification SCI_EN bit should be restored
 2858          * by ACPI platform (BIOS, firmware) to its pre-sleep state.
 2859          * Unfortunately some BIOSes fail to do that and that leads to
 2860          * unexpected and serious consequences during wake up like a system
 2861          * getting stuck in SMI handlers.
 2862          * This hack is picked up from Linux, which claims that it follows
 2863          * Windows behavior.
 2864          */
 2865         if (sleep_result == 1 && state != ACPI_STATE_S4)
 2866             AcpiWriteBitRegister(ACPI_BITREG_SCI_ENABLE, ACPI_ENABLE_EVENT);
 2867 
 2868         AcpiLeaveSleepStatePrep(state);
 2869 
 2870         if (sleep_result == 1 && state == ACPI_STATE_S3) {
 2871             /*
 2872              * Prevent mis-interpretation of the wakeup by power button
 2873              * as a request for power off.
 2874              * Ideally we should post an appropriate wakeup event,
 2875              * perhaps using acpi_event_power_button_wake or alike.
 2876              *
 2877              * Clearing of power button status after wakeup is mandated
 2878              * by ACPI specification in section "Fixed Power Button".
 2879              *
 2880              * XXX As of ACPICA 20121114 AcpiGetEventStatus provides
 2881              * status as 0/1 corressponding to inactive/active despite
 2882              * its type being ACPI_EVENT_STATUS.  In other words,
 2883              * we should not test for ACPI_EVENT_FLAG_SET for time being.
 2884              */
 2885             if (ACPI_SUCCESS(AcpiGetEventStatus(ACPI_EVENT_POWER_BUTTON,
 2886                 &power_button_status)) && power_button_status != 0) {
 2887                 AcpiClearEvent(ACPI_EVENT_POWER_BUTTON);
 2888                 device_printf(sc->acpi_dev,
 2889                     "cleared fixed power button status\n");
 2890             }
 2891         }
 2892 
 2893         intr_restore(intr);
 2894 
 2895         /* call acpi_wakeup_machdep() again with interrupt enabled */
 2896         acpi_wakeup_machdep(sc, state, sleep_result, 1);
 2897 
 2898         if (sleep_result == -1)
 2899                 goto backout;
 2900 
 2901         /* Re-enable ACPI hardware on wakeup from sleep state 4. */
 2902         if (state == ACPI_STATE_S4)
 2903             AcpiEnable();
 2904     } else {
 2905         status = AcpiEnterSleepState(state);
 2906         AcpiLeaveSleepStatePrep(state);
 2907         intr_restore(intr);
 2908         if (ACPI_FAILURE(status)) {
 2909             device_printf(sc->acpi_dev, "AcpiEnterSleepState failed - %s\n",
 2910                           AcpiFormatException(status));
 2911             goto backout;
 2912         }
 2913     }
 2914     slp_state = ACPI_SS_SLEPT;
 2915 
 2916     /*
 2917      * Back out state according to how far along we got in the suspend
 2918      * process.  This handles both the error and success cases.
 2919      */
 2920 backout:
 2921     if (slp_state >= ACPI_SS_GPE_SET) {
 2922         acpi_wake_prep_walk(state);
 2923         sc->acpi_sstate = ACPI_STATE_S0;
 2924     }
 2925     if (slp_state >= ACPI_SS_DEV_SUSPEND)
 2926         DEVICE_RESUME(root_bus);
 2927     if (slp_state >= ACPI_SS_SLP_PREP)
 2928         AcpiLeaveSleepState(state);
 2929     if (slp_state >= ACPI_SS_SLEPT) {
 2930         acpi_resync_clock(sc);
 2931         acpi_enable_fixed_events(sc);
 2932     }
 2933     sc->acpi_next_sstate = 0;
 2934 
 2935     mtx_unlock(&Giant);
 2936 
 2937     if (smp_started) {
 2938         thread_lock(curthread);
 2939         sched_unbind(curthread);
 2940         thread_unlock(curthread);
 2941     }
 2942 
 2943     resume_all_proc();
 2944 
 2945     EVENTHANDLER_INVOKE(power_resume);
 2946 
 2947     /* Allow another sleep request after a while. */
 2948     timeout(acpi_sleep_enable, sc, hz * ACPI_MINIMUM_AWAKETIME);
 2949 
 2950     /* Run /etc/rc.resume after we are back. */
 2951     if (devctl_process_running())
 2952         acpi_UserNotify("Resume", ACPI_ROOT_OBJECT, state);
 2953 
 2954     return_ACPI_STATUS (status);
 2955 }
 2956 
 2957 static void
 2958 acpi_resync_clock(struct acpi_softc *sc)
 2959 {
 2960 #ifdef __amd64__
 2961     if (!acpi_reset_clock)
 2962         return;
 2963 
 2964     /*
 2965      * Warm up timecounter again and reset system clock.
 2966      */
 2967     (void)timecounter->tc_get_timecount(timecounter);
 2968     (void)timecounter->tc_get_timecount(timecounter);
 2969     inittodr(time_second + sc->acpi_sleep_delay);
 2970 #endif
 2971 }
 2972 
 2973 /* Enable or disable the device's wake GPE. */
 2974 int
 2975 acpi_wake_set_enable(device_t dev, int enable)
 2976 {
 2977     struct acpi_prw_data prw;
 2978     ACPI_STATUS status;
 2979     int flags;
 2980 
 2981     /* Make sure the device supports waking the system and get the GPE. */
 2982     if (acpi_parse_prw(acpi_get_handle(dev), &prw) != 0)
 2983         return (ENXIO);
 2984 
 2985     flags = acpi_get_flags(dev);
 2986     if (enable) {
 2987         status = AcpiSetGpeWakeMask(prw.gpe_handle, prw.gpe_bit,
 2988             ACPI_GPE_ENABLE);
 2989         if (ACPI_FAILURE(status)) {
 2990             device_printf(dev, "enable wake failed\n");
 2991             return (ENXIO);
 2992         }
 2993         acpi_set_flags(dev, flags | ACPI_FLAG_WAKE_ENABLED);
 2994     } else {
 2995         status = AcpiSetGpeWakeMask(prw.gpe_handle, prw.gpe_bit,
 2996             ACPI_GPE_DISABLE);
 2997         if (ACPI_FAILURE(status)) {
 2998             device_printf(dev, "disable wake failed\n");
 2999             return (ENXIO);
 3000         }
 3001         acpi_set_flags(dev, flags & ~ACPI_FLAG_WAKE_ENABLED);
 3002     }
 3003 
 3004     return (0);
 3005 }
 3006 
 3007 static int
 3008 acpi_wake_sleep_prep(ACPI_HANDLE handle, int sstate)
 3009 {
 3010     struct acpi_prw_data prw;
 3011     device_t dev;
 3012 
 3013     /* Check that this is a wake-capable device and get its GPE. */
 3014     if (acpi_parse_prw(handle, &prw) != 0)
 3015         return (ENXIO);
 3016     dev = acpi_get_device(handle);
 3017 
 3018     /*
 3019      * The destination sleep state must be less than (i.e., higher power)
 3020      * or equal to the value specified by _PRW.  If this GPE cannot be
 3021      * enabled for the next sleep state, then disable it.  If it can and
 3022      * the user requested it be enabled, turn on any required power resources
 3023      * and set _PSW.
 3024      */
 3025     if (sstate > prw.lowest_wake) {
 3026         AcpiSetGpeWakeMask(prw.gpe_handle, prw.gpe_bit, ACPI_GPE_DISABLE);
 3027         if (bootverbose)
 3028             device_printf(dev, "wake_prep disabled wake for %s (S%d)\n",
 3029                 acpi_name(handle), sstate);
 3030     } else if (dev && (acpi_get_flags(dev) & ACPI_FLAG_WAKE_ENABLED) != 0) {
 3031         acpi_pwr_wake_enable(handle, 1);
 3032         acpi_SetInteger(handle, "_PSW", 1);
 3033         if (bootverbose)
 3034             device_printf(dev, "wake_prep enabled for %s (S%d)\n",
 3035                 acpi_name(handle), sstate);
 3036     }
 3037 
 3038     return (0);
 3039 }
 3040 
 3041 static int
 3042 acpi_wake_run_prep(ACPI_HANDLE handle, int sstate)
 3043 {
 3044     struct acpi_prw_data prw;
 3045     device_t dev;
 3046 
 3047     /*
 3048      * Check that this is a wake-capable device and get its GPE.  Return
 3049      * now if the user didn't enable this device for wake.
 3050      */
 3051     if (acpi_parse_prw(handle, &prw) != 0)
 3052         return (ENXIO);
 3053     dev = acpi_get_device(handle);
 3054     if (dev == NULL || (acpi_get_flags(dev) & ACPI_FLAG_WAKE_ENABLED) == 0)
 3055         return (0);
 3056 
 3057     /*
 3058      * If this GPE couldn't be enabled for the previous sleep state, it was
 3059      * disabled before going to sleep so re-enable it.  If it was enabled,
 3060      * clear _PSW and turn off any power resources it used.
 3061      */
 3062     if (sstate > prw.lowest_wake) {
 3063         AcpiSetGpeWakeMask(prw.gpe_handle, prw.gpe_bit, ACPI_GPE_ENABLE);
 3064         if (bootverbose)
 3065             device_printf(dev, "run_prep re-enabled %s\n", acpi_name(handle));
 3066     } else {
 3067         acpi_SetInteger(handle, "_PSW", 0);
 3068         acpi_pwr_wake_enable(handle, 0);
 3069         if (bootverbose)
 3070             device_printf(dev, "run_prep cleaned up for %s\n",
 3071                 acpi_name(handle));
 3072     }
 3073 
 3074     return (0);
 3075 }
 3076 
 3077 static ACPI_STATUS
 3078 acpi_wake_prep(ACPI_HANDLE handle, UINT32 level, void *context, void **status)
 3079 {
 3080     int sstate;
 3081 
 3082     /* If suspending, run the sleep prep function, otherwise wake. */
 3083     sstate = *(int *)context;
 3084     if (AcpiGbl_SystemAwakeAndRunning)
 3085         acpi_wake_sleep_prep(handle, sstate);
 3086     else
 3087         acpi_wake_run_prep(handle, sstate);
 3088     return (AE_OK);
 3089 }
 3090 
 3091 /* Walk the tree rooted at acpi0 to prep devices for suspend/resume. */
 3092 static int
 3093 acpi_wake_prep_walk(int sstate)
 3094 {
 3095     ACPI_HANDLE sb_handle;
 3096 
 3097     if (ACPI_SUCCESS(AcpiGetHandle(ACPI_ROOT_OBJECT, "\\_SB_", &sb_handle)))
 3098         AcpiWalkNamespace(ACPI_TYPE_DEVICE, sb_handle, 100,
 3099             acpi_wake_prep, NULL, &sstate, NULL);
 3100     return (0);
 3101 }
 3102 
 3103 /* Walk the tree rooted at acpi0 to attach per-device wake sysctls. */
 3104 static int
 3105 acpi_wake_sysctl_walk(device_t dev)
 3106 {
 3107     int error, i, numdevs;
 3108     device_t *devlist;
 3109     device_t child;
 3110     ACPI_STATUS status;
 3111 
 3112     error = device_get_children(dev, &devlist, &numdevs);
 3113     if (error != 0 || numdevs == 0) {
 3114         if (numdevs == 0)
 3115             free(devlist, M_TEMP);
 3116         return (error);
 3117     }
 3118     for (i = 0; i < numdevs; i++) {
 3119         child = devlist[i];
 3120         acpi_wake_sysctl_walk(child);
 3121         if (!device_is_attached(child))
 3122             continue;
 3123         status = AcpiEvaluateObject(acpi_get_handle(child), "_PRW", NULL, NULL);
 3124         if (ACPI_SUCCESS(status)) {
 3125             SYSCTL_ADD_PROC(device_get_sysctl_ctx(child),
 3126                 SYSCTL_CHILDREN(device_get_sysctl_tree(child)), OID_AUTO,
 3127                 "wake", CTLTYPE_INT | CTLFLAG_RW, child, 0,
 3128                 acpi_wake_set_sysctl, "I", "Device set to wake the system");
 3129         }
 3130     }
 3131     free(devlist, M_TEMP);
 3132 
 3133     return (0);
 3134 }
 3135 
 3136 /* Enable or disable wake from userland. */
 3137 static int
 3138 acpi_wake_set_sysctl(SYSCTL_HANDLER_ARGS)
 3139 {
 3140     int enable, error;
 3141     device_t dev;
 3142 
 3143     dev = (device_t)arg1;
 3144     enable = (acpi_get_flags(dev) & ACPI_FLAG_WAKE_ENABLED) ? 1 : 0;
 3145 
 3146     error = sysctl_handle_int(oidp, &enable, 0, req);
 3147     if (error != 0 || req->newptr == NULL)
 3148         return (error);
 3149     if (enable != 0 && enable != 1)
 3150         return (EINVAL);
 3151 
 3152     return (acpi_wake_set_enable(dev, enable));
 3153 }
 3154 
 3155 /* Parse a device's _PRW into a structure. */
 3156 int
 3157 acpi_parse_prw(ACPI_HANDLE h, struct acpi_prw_data *prw)
 3158 {
 3159     ACPI_STATUS                 status;
 3160     ACPI_BUFFER                 prw_buffer;
 3161     ACPI_OBJECT                 *res, *res2;
 3162     int                         error, i, power_count;
 3163 
 3164     if (h == NULL || prw == NULL)
 3165         return (EINVAL);
 3166 
 3167     /*
 3168      * The _PRW object (7.2.9) is only required for devices that have the
 3169      * ability to wake the system from a sleeping state.
 3170      */
 3171     error = EINVAL;
 3172     prw_buffer.Pointer = NULL;
 3173     prw_buffer.Length = ACPI_ALLOCATE_BUFFER;
 3174     status = AcpiEvaluateObject(h, "_PRW", NULL, &prw_buffer);
 3175     if (ACPI_FAILURE(status))
 3176         return (ENOENT);
 3177     res = (ACPI_OBJECT *)prw_buffer.Pointer;
 3178     if (res == NULL)
 3179         return (ENOENT);
 3180     if (!ACPI_PKG_VALID(res, 2))
 3181         goto out;
 3182 
 3183     /*
 3184      * Element 1 of the _PRW object:
 3185      * The lowest power system sleeping state that can be entered while still
 3186      * providing wake functionality.  The sleeping state being entered must
 3187      * be less than (i.e., higher power) or equal to this value.
 3188      */
 3189     if (acpi_PkgInt32(res, 1, &prw->lowest_wake) != 0)
 3190         goto out;
 3191 
 3192     /*
 3193      * Element 0 of the _PRW object:
 3194      */
 3195     switch (res->Package.Elements[0].Type) {
 3196     case ACPI_TYPE_INTEGER:
 3197         /*
 3198          * If the data type of this package element is numeric, then this
 3199          * _PRW package element is the bit index in the GPEx_EN, in the
 3200          * GPE blocks described in the FADT, of the enable bit that is
 3201          * enabled for the wake event.
 3202          */
 3203         prw->gpe_handle = NULL;
 3204         prw->gpe_bit = res->Package.Elements[0].Integer.Value;
 3205         error = 0;
 3206         break;
 3207     case ACPI_TYPE_PACKAGE:
 3208         /*
 3209          * If the data type of this package element is a package, then this
 3210          * _PRW package element is itself a package containing two
 3211          * elements.  The first is an object reference to the GPE Block
 3212          * device that contains the GPE that will be triggered by the wake
 3213          * event.  The second element is numeric and it contains the bit
 3214          * index in the GPEx_EN, in the GPE Block referenced by the
 3215          * first element in the package, of the enable bit that is enabled for
 3216          * the wake event.
 3217          *
 3218          * For example, if this field is a package then it is of the form:
 3219          * Package() {\_SB.PCI0.ISA.GPE, 2}
 3220          */
 3221         res2 = &res->Package.Elements[0];
 3222         if (!ACPI_PKG_VALID(res2, 2))
 3223             goto out;
 3224         prw->gpe_handle = acpi_GetReference(NULL, &res2->Package.Elements[0]);
 3225         if (prw->gpe_handle == NULL)
 3226             goto out;
 3227         if (acpi_PkgInt32(res2, 1, &prw->gpe_bit) != 0)
 3228             goto out;
 3229         error = 0;
 3230         break;
 3231     default:
 3232         goto out;
 3233     }
 3234 
 3235     /* Elements 2 to N of the _PRW object are power resources. */
 3236     power_count = res->Package.Count - 2;
 3237     if (power_count > ACPI_PRW_MAX_POWERRES) {
 3238         printf("ACPI device %s has too many power resources\n", acpi_name(h));
 3239         power_count = 0;
 3240     }
 3241     prw->power_res_count = power_count;
 3242     for (i = 0; i < power_count; i++)
 3243         prw->power_res[i] = res->Package.Elements[i];
 3244 
 3245 out:
 3246     if (prw_buffer.Pointer != NULL)
 3247         AcpiOsFree(prw_buffer.Pointer);
 3248     return (error);
 3249 }
 3250 
 3251 /*
 3252  * ACPI Event Handlers
 3253  */
 3254 
 3255 /* System Event Handlers (registered by EVENTHANDLER_REGISTER) */
 3256 
 3257 static void
 3258 acpi_system_eventhandler_sleep(void *arg, int state)
 3259 {
 3260     struct acpi_softc *sc = (struct acpi_softc *)arg;
 3261     int ret;
 3262 
 3263     ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, state);
 3264 
 3265     /* Check if button action is disabled or unknown. */
 3266     if (state == ACPI_STATE_UNKNOWN)
 3267         return;
 3268 
 3269     /* Request that the system prepare to enter the given suspend state. */
 3270     ret = acpi_ReqSleepState(sc, state);
 3271     if (ret != 0)
 3272         device_printf(sc->acpi_dev,
 3273             "request to enter state S%d failed (err %d)\n", state, ret);
 3274 
 3275     return_VOID;
 3276 }
 3277 
 3278 static void
 3279 acpi_system_eventhandler_wakeup(void *arg, int state)
 3280 {
 3281 
 3282     ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, state);
 3283 
 3284     /* Currently, nothing to do for wakeup. */
 3285 
 3286     return_VOID;
 3287 }
 3288 
 3289 /* 
 3290  * ACPICA Event Handlers (FixedEvent, also called from button notify handler)
 3291  */
 3292 static void
 3293 acpi_invoke_sleep_eventhandler(void *context)
 3294 {
 3295 
 3296     EVENTHANDLER_INVOKE(acpi_sleep_event, *(int *)context);
 3297 }
 3298 
 3299 static void
 3300 acpi_invoke_wake_eventhandler(void *context)
 3301 {
 3302 
 3303     EVENTHANDLER_INVOKE(acpi_wakeup_event, *(int *)context);
 3304 }
 3305 
 3306 UINT32
 3307 acpi_event_power_button_sleep(void *context)
 3308 {
 3309     struct acpi_softc   *sc = (struct acpi_softc *)context;
 3310 
 3311     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 3312 
 3313     if (ACPI_FAILURE(AcpiOsExecute(OSL_NOTIFY_HANDLER,
 3314         acpi_invoke_sleep_eventhandler, &sc->acpi_power_button_sx)))
 3315         return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
 3316     return_VALUE (ACPI_INTERRUPT_HANDLED);
 3317 }
 3318 
 3319 UINT32
 3320 acpi_event_power_button_wake(void *context)
 3321 {
 3322     struct acpi_softc   *sc = (struct acpi_softc *)context;
 3323 
 3324     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 3325 
 3326     if (ACPI_FAILURE(AcpiOsExecute(OSL_NOTIFY_HANDLER,
 3327         acpi_invoke_wake_eventhandler, &sc->acpi_power_button_sx)))
 3328         return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
 3329     return_VALUE (ACPI_INTERRUPT_HANDLED);
 3330 }
 3331 
 3332 UINT32
 3333 acpi_event_sleep_button_sleep(void *context)
 3334 {
 3335     struct acpi_softc   *sc = (struct acpi_softc *)context;
 3336 
 3337     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 3338 
 3339     if (ACPI_FAILURE(AcpiOsExecute(OSL_NOTIFY_HANDLER,
 3340         acpi_invoke_sleep_eventhandler, &sc->acpi_sleep_button_sx)))
 3341         return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
 3342     return_VALUE (ACPI_INTERRUPT_HANDLED);
 3343 }
 3344 
 3345 UINT32
 3346 acpi_event_sleep_button_wake(void *context)
 3347 {
 3348     struct acpi_softc   *sc = (struct acpi_softc *)context;
 3349 
 3350     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 3351 
 3352     if (ACPI_FAILURE(AcpiOsExecute(OSL_NOTIFY_HANDLER,
 3353         acpi_invoke_wake_eventhandler, &sc->acpi_sleep_button_sx)))
 3354         return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
 3355     return_VALUE (ACPI_INTERRUPT_HANDLED);
 3356 }
 3357 
 3358 /*
 3359  * XXX This static buffer is suboptimal.  There is no locking so only
 3360  * use this for single-threaded callers.
 3361  */
 3362 char *
 3363 acpi_name(ACPI_HANDLE handle)
 3364 {
 3365     ACPI_BUFFER buf;
 3366     static char data[256];
 3367 
 3368     buf.Length = sizeof(data);
 3369     buf.Pointer = data;
 3370 
 3371     if (handle && ACPI_SUCCESS(AcpiGetName(handle, ACPI_FULL_PATHNAME, &buf)))
 3372         return (data);
 3373     return ("(unknown)");
 3374 }
 3375 
 3376 /*
 3377  * Debugging/bug-avoidance.  Avoid trying to fetch info on various
 3378  * parts of the namespace.
 3379  */
 3380 int
 3381 acpi_avoid(ACPI_HANDLE handle)
 3382 {
 3383     char        *cp, *env, *np;
 3384     int         len;
 3385 
 3386     np = acpi_name(handle);
 3387     if (*np == '\\')
 3388         np++;
 3389     if ((env = getenv("debug.acpi.avoid")) == NULL)
 3390         return (0);
 3391 
 3392     /* Scan the avoid list checking for a match */
 3393     cp = env;
 3394     for (;;) {
 3395         while (*cp != 0 && isspace(*cp))
 3396             cp++;
 3397         if (*cp == 0)
 3398             break;
 3399         len = 0;
 3400         while (cp[len] != 0 && !isspace(cp[len]))
 3401             len++;
 3402         if (!strncmp(cp, np, len)) {
 3403             freeenv(env);
 3404             return(1);
 3405         }
 3406         cp += len;
 3407     }
 3408     freeenv(env);
 3409 
 3410     return (0);
 3411 }
 3412 
 3413 /*
 3414  * Debugging/bug-avoidance.  Disable ACPI subsystem components.
 3415  */
 3416 int
 3417 acpi_disabled(char *subsys)
 3418 {
 3419     char        *cp, *env;
 3420     int         len;
 3421 
 3422     if ((env = getenv("debug.acpi.disabled")) == NULL)
 3423         return (0);
 3424     if (strcmp(env, "all") == 0) {
 3425         freeenv(env);
 3426         return (1);
 3427     }
 3428 
 3429     /* Scan the disable list, checking for a match. */
 3430     cp = env;
 3431     for (;;) {
 3432         while (*cp != '\0' && isspace(*cp))
 3433             cp++;
 3434         if (*cp == '\0')
 3435             break;
 3436         len = 0;
 3437         while (cp[len] != '\0' && !isspace(cp[len]))
 3438             len++;
 3439         if (strncmp(cp, subsys, len) == 0) {
 3440             freeenv(env);
 3441             return (1);
 3442         }
 3443         cp += len;
 3444     }
 3445     freeenv(env);
 3446 
 3447     return (0);
 3448 }
 3449 
 3450 static void
 3451 acpi_lookup(void *arg, const char *name, device_t *dev)
 3452 {
 3453     ACPI_HANDLE handle;
 3454 
 3455     if (*dev != NULL)
 3456         return;
 3457 
 3458     /*
 3459      * Allow any handle name that is specified as an absolute path and
 3460      * starts with '\'.  We could restrict this to \_SB and friends,
 3461      * but see acpi_probe_children() for notes on why we scan the entire
 3462      * namespace for devices.
 3463      *
 3464      * XXX: The pathname argument to AcpiGetHandle() should be fixed to
 3465      * be const.
 3466      */
 3467     if (name[0] != '\\')
 3468         return;
 3469     if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, __DECONST(char *, name),
 3470         &handle)))
 3471         return;
 3472     *dev = acpi_get_device(handle);
 3473 }
 3474 
 3475 /*
 3476  * Control interface.
 3477  *
 3478  * We multiplex ioctls for all participating ACPI devices here.  Individual 
 3479  * drivers wanting to be accessible via /dev/acpi should use the
 3480  * register/deregister interface to make their handlers visible.
 3481  */
 3482 struct acpi_ioctl_hook
 3483 {
 3484     TAILQ_ENTRY(acpi_ioctl_hook) link;
 3485     u_long                       cmd;
 3486     acpi_ioctl_fn                fn;
 3487     void                         *arg;
 3488 };
 3489 
 3490 static TAILQ_HEAD(,acpi_ioctl_hook)     acpi_ioctl_hooks;
 3491 static int                              acpi_ioctl_hooks_initted;
 3492 
 3493 int
 3494 acpi_register_ioctl(u_long cmd, acpi_ioctl_fn fn, void *arg)
 3495 {
 3496     struct acpi_ioctl_hook      *hp;
 3497 
 3498     if ((hp = malloc(sizeof(*hp), M_ACPIDEV, M_NOWAIT)) == NULL)
 3499         return (ENOMEM);
 3500     hp->cmd = cmd;
 3501     hp->fn = fn;
 3502     hp->arg = arg;
 3503 
 3504     ACPI_LOCK(acpi);
 3505     if (acpi_ioctl_hooks_initted == 0) {
 3506         TAILQ_INIT(&acpi_ioctl_hooks);
 3507         acpi_ioctl_hooks_initted = 1;
 3508     }
 3509     TAILQ_INSERT_TAIL(&acpi_ioctl_hooks, hp, link);
 3510     ACPI_UNLOCK(acpi);
 3511 
 3512     return (0);
 3513 }
 3514 
 3515 void
 3516 acpi_deregister_ioctl(u_long cmd, acpi_ioctl_fn fn)
 3517 {
 3518     struct acpi_ioctl_hook      *hp;
 3519 
 3520     ACPI_LOCK(acpi);
 3521     TAILQ_FOREACH(hp, &acpi_ioctl_hooks, link)
 3522         if (hp->cmd == cmd && hp->fn == fn)
 3523             break;
 3524 
 3525     if (hp != NULL) {
 3526         TAILQ_REMOVE(&acpi_ioctl_hooks, hp, link);
 3527         free(hp, M_ACPIDEV);
 3528     }
 3529     ACPI_UNLOCK(acpi);
 3530 }
 3531 
 3532 static int
 3533 acpiopen(struct cdev *dev, int flag, int fmt, struct thread *td)
 3534 {
 3535     return (0);
 3536 }
 3537 
 3538 static int
 3539 acpiclose(struct cdev *dev, int flag, int fmt, struct thread *td)
 3540 {
 3541     return (0);
 3542 }
 3543 
 3544 static int
 3545 acpiioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
 3546 {
 3547     struct acpi_softc           *sc;
 3548     struct acpi_ioctl_hook      *hp;
 3549     int                         error, state;
 3550 
 3551     error = 0;
 3552     hp = NULL;
 3553     sc = dev->si_drv1;
 3554 
 3555     /*
 3556      * Scan the list of registered ioctls, looking for handlers.
 3557      */
 3558     ACPI_LOCK(acpi);
 3559     if (acpi_ioctl_hooks_initted)
 3560         TAILQ_FOREACH(hp, &acpi_ioctl_hooks, link) {
 3561             if (hp->cmd == cmd)
 3562                 break;
 3563         }
 3564     ACPI_UNLOCK(acpi);
 3565     if (hp)
 3566         return (hp->fn(cmd, addr, hp->arg));
 3567 
 3568     /*
 3569      * Core ioctls are not permitted for non-writable user.
 3570      * Currently, other ioctls just fetch information.
 3571      * Not changing system behavior.
 3572      */
 3573     if ((flag & FWRITE) == 0)
 3574         return (EPERM);
 3575 
 3576     /* Core system ioctls. */
 3577     switch (cmd) {
 3578     case ACPIIO_REQSLPSTATE:
 3579         state = *(int *)addr;
 3580         if (state != ACPI_STATE_S5)
 3581             return (acpi_ReqSleepState(sc, state));
 3582         device_printf(sc->acpi_dev, "power off via acpi ioctl not supported\n");
 3583         error = EOPNOTSUPP;
 3584         break;
 3585     case ACPIIO_ACKSLPSTATE:
 3586         error = *(int *)addr;
 3587         error = acpi_AckSleepState(sc->acpi_clone, error);
 3588         break;
 3589     case ACPIIO_SETSLPSTATE:    /* DEPRECATED */
 3590         state = *(int *)addr;
 3591         if (state < ACPI_STATE_S0 || state > ACPI_S_STATES_MAX)
 3592             return (EINVAL);
 3593         if (!acpi_sleep_states[state])
 3594             return (EOPNOTSUPP);
 3595         if (ACPI_FAILURE(acpi_SetSleepState(sc, state)))
 3596             error = ENXIO;
 3597         break;
 3598     default:
 3599         error = ENXIO;
 3600         break;
 3601     }
 3602 
 3603     return (error);
 3604 }
 3605 
 3606 static int
 3607 acpi_sname2sstate(const char *sname)
 3608 {
 3609     int sstate;
 3610 
 3611     if (toupper(sname[0]) == 'S') {
 3612         sstate = sname[1] - '';
 3613         if (sstate >= ACPI_STATE_S0 && sstate <= ACPI_STATE_S5 &&
 3614             sname[2] == '\0')
 3615             return (sstate);
 3616     } else if (strcasecmp(sname, "NONE") == 0)
 3617         return (ACPI_STATE_UNKNOWN);
 3618     return (-1);
 3619 }
 3620 
 3621 static const char *
 3622 acpi_sstate2sname(int sstate)
 3623 {
 3624     static const char *snames[] = { "S0", "S1", "S2", "S3", "S4", "S5" };
 3625 
 3626     if (sstate >= ACPI_STATE_S0 && sstate <= ACPI_STATE_S5)
 3627         return (snames[sstate]);
 3628     else if (sstate == ACPI_STATE_UNKNOWN)
 3629         return ("NONE");
 3630     return (NULL);
 3631 }
 3632 
 3633 static int
 3634 acpi_supported_sleep_state_sysctl(SYSCTL_HANDLER_ARGS)
 3635 {
 3636     int error;
 3637     struct sbuf sb;
 3638     UINT8 state;
 3639 
 3640     sbuf_new(&sb, NULL, 32, SBUF_AUTOEXTEND);
 3641     for (state = ACPI_STATE_S1; state < ACPI_S_STATE_COUNT; state++)
 3642         if (acpi_sleep_states[state])
 3643             sbuf_printf(&sb, "%s ", acpi_sstate2sname(state));
 3644     sbuf_trim(&sb);
 3645     sbuf_finish(&sb);
 3646     error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req);
 3647     sbuf_delete(&sb);
 3648     return (error);
 3649 }
 3650 
 3651 static int
 3652 acpi_sleep_state_sysctl(SYSCTL_HANDLER_ARGS)
 3653 {
 3654     char sleep_state[10];
 3655     int error, new_state, old_state;
 3656 
 3657     old_state = *(int *)oidp->oid_arg1;
 3658     strlcpy(sleep_state, acpi_sstate2sname(old_state), sizeof(sleep_state));
 3659     error = sysctl_handle_string(oidp, sleep_state, sizeof(sleep_state), req);
 3660     if (error == 0 && req->newptr != NULL) {
 3661         new_state = acpi_sname2sstate(sleep_state);
 3662         if (new_state < ACPI_STATE_S1)
 3663             return (EINVAL);
 3664         if (new_state < ACPI_S_STATE_COUNT && !acpi_sleep_states[new_state])
 3665             return (EOPNOTSUPP);
 3666         if (new_state != old_state)
 3667             *(int *)oidp->oid_arg1 = new_state;
 3668     }
 3669     return (error);
 3670 }
 3671 
 3672 /* Inform devctl(4) when we receive a Notify. */
 3673 void
 3674 acpi_UserNotify(const char *subsystem, ACPI_HANDLE h, uint8_t notify)
 3675 {
 3676     char                notify_buf[16];
 3677     ACPI_BUFFER         handle_buf;
 3678     ACPI_STATUS         status;
 3679 
 3680     if (subsystem == NULL)
 3681         return;
 3682 
 3683     handle_buf.Pointer = NULL;
 3684     handle_buf.Length = ACPI_ALLOCATE_BUFFER;
 3685     status = AcpiNsHandleToPathname(h, &handle_buf, FALSE);
 3686     if (ACPI_FAILURE(status))
 3687         return;
 3688     snprintf(notify_buf, sizeof(notify_buf), "notify=0x%02x", notify);
 3689     devctl_notify("ACPI", subsystem, handle_buf.Pointer, notify_buf);
 3690     AcpiOsFree(handle_buf.Pointer);
 3691 }
 3692 
 3693 #ifdef ACPI_DEBUG
 3694 /*
 3695  * Support for parsing debug options from the kernel environment.
 3696  *
 3697  * Bits may be set in the AcpiDbgLayer and AcpiDbgLevel debug registers
 3698  * by specifying the names of the bits in the debug.acpi.layer and
 3699  * debug.acpi.level environment variables.  Bits may be unset by 
 3700  * prefixing the bit name with !.
 3701  */
 3702 struct debugtag
 3703 {
 3704     char        *name;
 3705     UINT32      value;
 3706 };
 3707 
 3708 static struct debugtag  dbg_layer[] = {
 3709     {"ACPI_UTILITIES",          ACPI_UTILITIES},
 3710     {"ACPI_HARDWARE",           ACPI_HARDWARE},
 3711     {"ACPI_EVENTS",             ACPI_EVENTS},
 3712     {"ACPI_TABLES",             ACPI_TABLES},
 3713     {"ACPI_NAMESPACE",          ACPI_NAMESPACE},
 3714     {"ACPI_PARSER",             ACPI_PARSER},
 3715     {"ACPI_DISPATCHER",         ACPI_DISPATCHER},
 3716     {"ACPI_EXECUTER",           ACPI_EXECUTER},
 3717     {"ACPI_RESOURCES",          ACPI_RESOURCES},
 3718     {"ACPI_CA_DEBUGGER",        ACPI_CA_DEBUGGER},
 3719     {"ACPI_OS_SERVICES",        ACPI_OS_SERVICES},
 3720     {"ACPI_CA_DISASSEMBLER",    ACPI_CA_DISASSEMBLER},
 3721     {"ACPI_ALL_COMPONENTS",     ACPI_ALL_COMPONENTS},
 3722 
 3723     {"ACPI_AC_ADAPTER",         ACPI_AC_ADAPTER},
 3724     {"ACPI_BATTERY",            ACPI_BATTERY},
 3725     {"ACPI_BUS",                ACPI_BUS},
 3726     {"ACPI_BUTTON",             ACPI_BUTTON},
 3727     {"ACPI_EC",                 ACPI_EC},
 3728     {"ACPI_FAN",                ACPI_FAN},
 3729     {"ACPI_POWERRES",           ACPI_POWERRES},
 3730     {"ACPI_PROCESSOR",          ACPI_PROCESSOR},
 3731     {"ACPI_THERMAL",            ACPI_THERMAL},
 3732     {"ACPI_TIMER",              ACPI_TIMER},
 3733     {"ACPI_ALL_DRIVERS",        ACPI_ALL_DRIVERS},
 3734     {NULL, 0}
 3735 };
 3736 
 3737 static struct debugtag dbg_level[] = {
 3738     {"ACPI_LV_INIT",            ACPI_LV_INIT},
 3739     {"ACPI_LV_DEBUG_OBJECT",    ACPI_LV_DEBUG_OBJECT},
 3740     {"ACPI_LV_INFO",            ACPI_LV_INFO},
 3741     {"ACPI_LV_REPAIR",          ACPI_LV_REPAIR},
 3742     {"ACPI_LV_ALL_EXCEPTIONS",  ACPI_LV_ALL_EXCEPTIONS},
 3743 
 3744     /* Trace verbosity level 1 [Standard Trace Level] */
 3745     {"ACPI_LV_INIT_NAMES",      ACPI_LV_INIT_NAMES},
 3746     {"ACPI_LV_PARSE",           ACPI_LV_PARSE},
 3747     {"ACPI_LV_LOAD",            ACPI_LV_LOAD},
 3748     {"ACPI_LV_DISPATCH",        ACPI_LV_DISPATCH},
 3749     {"ACPI_LV_EXEC",            ACPI_LV_EXEC},
 3750     {"ACPI_LV_NAMES",           ACPI_LV_NAMES},
 3751     {"ACPI_LV_OPREGION",        ACPI_LV_OPREGION},
 3752     {"ACPI_LV_BFIELD",          ACPI_LV_BFIELD},
 3753     {"ACPI_LV_TABLES",          ACPI_LV_TABLES},
 3754     {"ACPI_LV_VALUES",          ACPI_LV_VALUES},
 3755     {"ACPI_LV_OBJECTS",         ACPI_LV_OBJECTS},
 3756     {"ACPI_LV_RESOURCES",       ACPI_LV_RESOURCES},
 3757     {"ACPI_LV_USER_REQUESTS",   ACPI_LV_USER_REQUESTS},
 3758     {"ACPI_LV_PACKAGE",         ACPI_LV_PACKAGE},
 3759     {"ACPI_LV_VERBOSITY1",      ACPI_LV_VERBOSITY1},
 3760 
 3761     /* Trace verbosity level 2 [Function tracing and memory allocation] */
 3762     {"ACPI_LV_ALLOCATIONS",     ACPI_LV_ALLOCATIONS},
 3763     {"ACPI_LV_FUNCTIONS",       ACPI_LV_FUNCTIONS},
 3764     {"ACPI_LV_OPTIMIZATIONS",   ACPI_LV_OPTIMIZATIONS},
 3765     {"ACPI_LV_VERBOSITY2",      ACPI_LV_VERBOSITY2},
 3766     {"ACPI_LV_ALL",             ACPI_LV_ALL},
 3767 
 3768     /* Trace verbosity level 3 [Threading, I/O, and Interrupts] */
 3769     {"ACPI_LV_MUTEX",           ACPI_LV_MUTEX},
 3770     {"ACPI_LV_THREADS",         ACPI_LV_THREADS},
 3771     {"ACPI_LV_IO",              ACPI_LV_IO},
 3772     {"ACPI_LV_INTERRUPTS",      ACPI_LV_INTERRUPTS},
 3773     {"ACPI_LV_VERBOSITY3",      ACPI_LV_VERBOSITY3},
 3774 
 3775     /* Exceptionally verbose output -- also used in the global "DebugLevel"  */
 3776     {"ACPI_LV_AML_DISASSEMBLE", ACPI_LV_AML_DISASSEMBLE},
 3777     {"ACPI_LV_VERBOSE_INFO",    ACPI_LV_VERBOSE_INFO},
 3778     {"ACPI_LV_FULL_TABLES",     ACPI_LV_FULL_TABLES},
 3779     {"ACPI_LV_EVENTS",          ACPI_LV_EVENTS},
 3780     {"ACPI_LV_VERBOSE",         ACPI_LV_VERBOSE},
 3781     {NULL, 0}
 3782 };    
 3783 
 3784 static void
 3785 acpi_parse_debug(char *cp, struct debugtag *tag, UINT32 *flag)
 3786 {
 3787     char        *ep;
 3788     int         i, l;
 3789     int         set;
 3790 
 3791     while (*cp) {
 3792         if (isspace(*cp)) {
 3793             cp++;
 3794             continue;
 3795         }
 3796         ep = cp;
 3797         while (*ep && !isspace(*ep))
 3798             ep++;
 3799         if (*cp == '!') {
 3800             set = 0;
 3801             cp++;
 3802             if (cp == ep)
 3803                 continue;
 3804         } else {
 3805             set = 1;
 3806         }
 3807         l = ep - cp;
 3808         for (i = 0; tag[i].name != NULL; i++) {
 3809             if (!strncmp(cp, tag[i].name, l)) {
 3810                 if (set)
 3811                     *flag |= tag[i].value;
 3812                 else
 3813                     *flag &= ~tag[i].value;
 3814             }
 3815         }
 3816         cp = ep;
 3817     }
 3818 }
 3819 
 3820 static void
 3821 acpi_set_debugging(void *junk)
 3822 {
 3823     char        *layer, *level;
 3824 
 3825     if (cold) {
 3826         AcpiDbgLayer = 0;
 3827         AcpiDbgLevel = 0;
 3828     }
 3829 
 3830     layer = getenv("debug.acpi.layer");
 3831     level = getenv("debug.acpi.level");
 3832     if (layer == NULL && level == NULL)
 3833         return;
 3834 
 3835     printf("ACPI set debug");
 3836     if (layer != NULL) {
 3837         if (strcmp("NONE", layer) != 0)
 3838             printf(" layer '%s'", layer);
 3839         acpi_parse_debug(layer, &dbg_layer[0], &AcpiDbgLayer);
 3840         freeenv(layer);
 3841     }
 3842     if (level != NULL) {
 3843         if (strcmp("NONE", level) != 0)
 3844             printf(" level '%s'", level);
 3845         acpi_parse_debug(level, &dbg_level[0], &AcpiDbgLevel);
 3846         freeenv(level);
 3847     }
 3848     printf("\n");
 3849 }
 3850 
 3851 SYSINIT(acpi_debugging, SI_SUB_TUNABLES, SI_ORDER_ANY, acpi_set_debugging,
 3852         NULL);
 3853 
 3854 static int
 3855 acpi_debug_sysctl(SYSCTL_HANDLER_ARGS)
 3856 {
 3857     int          error, *dbg;
 3858     struct       debugtag *tag;
 3859     struct       sbuf sb;
 3860     char         temp[128];
 3861 
 3862     if (sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND) == NULL)
 3863         return (ENOMEM);
 3864     if (strcmp(oidp->oid_arg1, "debug.acpi.layer") == 0) {
 3865         tag = &dbg_layer[0];
 3866         dbg = &AcpiDbgLayer;
 3867     } else {
 3868         tag = &dbg_level[0];
 3869         dbg = &AcpiDbgLevel;
 3870     }
 3871 
 3872     /* Get old values if this is a get request. */
 3873     ACPI_SERIAL_BEGIN(acpi);
 3874     if (*dbg == 0) {
 3875         sbuf_cpy(&sb, "NONE");
 3876     } else if (req->newptr == NULL) {
 3877         for (; tag->name != NULL; tag++) {
 3878             if ((*dbg & tag->value) == tag->value)
 3879                 sbuf_printf(&sb, "%s ", tag->name);
 3880         }
 3881     }
 3882     sbuf_trim(&sb);
 3883     sbuf_finish(&sb);
 3884     strlcpy(temp, sbuf_data(&sb), sizeof(temp));
 3885     sbuf_delete(&sb);
 3886 
 3887     error = sysctl_handle_string(oidp, temp, sizeof(temp), req);
 3888 
 3889     /* Check for error or no change */
 3890     if (error == 0 && req->newptr != NULL) {
 3891         *dbg = 0;
 3892         setenv((char *)oidp->oid_arg1, temp);
 3893         acpi_set_debugging(NULL);
 3894     }
 3895     ACPI_SERIAL_END(acpi);
 3896 
 3897     return (error);
 3898 }
 3899 
 3900 SYSCTL_PROC(_debug_acpi, OID_AUTO, layer, CTLFLAG_RW | CTLTYPE_STRING,
 3901             "debug.acpi.layer", 0, acpi_debug_sysctl, "A", "");
 3902 SYSCTL_PROC(_debug_acpi, OID_AUTO, level, CTLFLAG_RW | CTLTYPE_STRING,
 3903             "debug.acpi.level", 0, acpi_debug_sysctl, "A", "");
 3904 #endif /* ACPI_DEBUG */
 3905 
 3906 static int
 3907 acpi_debug_objects_sysctl(SYSCTL_HANDLER_ARGS)
 3908 {
 3909         int     error;
 3910         int     old;
 3911 
 3912         old = acpi_debug_objects;
 3913         error = sysctl_handle_int(oidp, &acpi_debug_objects, 0, req);
 3914         if (error != 0 || req->newptr == NULL)
 3915                 return (error);
 3916         if (old == acpi_debug_objects || (old && acpi_debug_objects))
 3917                 return (0);
 3918 
 3919         ACPI_SERIAL_BEGIN(acpi);
 3920         AcpiGbl_EnableAmlDebugObject = acpi_debug_objects ? TRUE : FALSE;
 3921         ACPI_SERIAL_END(acpi);
 3922 
 3923         return (0);
 3924 }
 3925 
 3926 static int
 3927 acpi_parse_interfaces(char *str, struct acpi_interface *iface)
 3928 {
 3929         char *p;
 3930         size_t len;
 3931         int i, j;
 3932 
 3933         p = str;
 3934         while (isspace(*p) || *p == ',')
 3935                 p++;
 3936         len = strlen(p);
 3937         if (len == 0)
 3938                 return (0);
 3939         p = strdup(p, M_TEMP);
 3940         for (i = 0; i < len; i++)
 3941                 if (p[i] == ',')
 3942                         p[i] = '\0';
 3943         i = j = 0;
 3944         while (i < len)
 3945                 if (isspace(p[i]) || p[i] == '\0')
 3946                         i++;
 3947                 else {
 3948                         i += strlen(p + i) + 1;
 3949                         j++;
 3950                 }
 3951         if (j == 0) {
 3952                 free(p, M_TEMP);
 3953                 return (0);
 3954         }
 3955         iface->data = malloc(sizeof(*iface->data) * j, M_TEMP, M_WAITOK);
 3956         iface->num = j;
 3957         i = j = 0;
 3958         while (i < len)
 3959                 if (isspace(p[i]) || p[i] == '\0')
 3960                         i++;
 3961                 else {
 3962                         iface->data[j] = p + i;
 3963                         i += strlen(p + i) + 1;
 3964                         j++;
 3965                 }
 3966 
 3967         return (j);
 3968 }
 3969 
 3970 static void
 3971 acpi_free_interfaces(struct acpi_interface *iface)
 3972 {
 3973 
 3974         free(iface->data[0], M_TEMP);
 3975         free(iface->data, M_TEMP);
 3976 }
 3977 
 3978 static void
 3979 acpi_reset_interfaces(device_t dev)
 3980 {
 3981         struct acpi_interface list;
 3982         ACPI_STATUS status;
 3983         int i;
 3984 
 3985         if (acpi_parse_interfaces(acpi_install_interface, &list) > 0) {
 3986                 for (i = 0; i < list.num; i++) {
 3987                         status = AcpiInstallInterface(list.data[i]);
 3988                         if (ACPI_FAILURE(status))
 3989                                 device_printf(dev,
 3990                                     "failed to install _OSI(\"%s\"): %s\n",
 3991                                     list.data[i], AcpiFormatException(status));
 3992                         else if (bootverbose)
 3993                                 device_printf(dev, "installed _OSI(\"%s\")\n",
 3994                                     list.data[i]);
 3995                 }
 3996                 acpi_free_interfaces(&list);
 3997         }
 3998         if (acpi_parse_interfaces(acpi_remove_interface, &list) > 0) {
 3999                 for (i = 0; i < list.num; i++) {
 4000                         status = AcpiRemoveInterface(list.data[i]);
 4001                         if (ACPI_FAILURE(status))
 4002                                 device_printf(dev,
 4003                                     "failed to remove _OSI(\"%s\"): %s\n",
 4004                                     list.data[i], AcpiFormatException(status));
 4005                         else if (bootverbose)
 4006                                 device_printf(dev, "removed _OSI(\"%s\")\n",
 4007                                     list.data[i]);
 4008                 }
 4009                 acpi_free_interfaces(&list);
 4010         }
 4011 }
 4012 
 4013 static int
 4014 acpi_pm_func(u_long cmd, void *arg, ...)
 4015 {
 4016         int     state, acpi_state;
 4017         int     error;
 4018         struct  acpi_softc *sc;
 4019         va_list ap;
 4020 
 4021         error = 0;
 4022         switch (cmd) {
 4023         case POWER_CMD_SUSPEND:
 4024                 sc = (struct acpi_softc *)arg;
 4025                 if (sc == NULL) {
 4026                         error = EINVAL;
 4027                         goto out;
 4028                 }
 4029 
 4030                 va_start(ap, arg);
 4031                 state = va_arg(ap, int);
 4032                 va_end(ap);
 4033 
 4034                 switch (state) {
 4035                 case POWER_SLEEP_STATE_STANDBY:
 4036                         acpi_state = sc->acpi_standby_sx;
 4037                         break;
 4038                 case POWER_SLEEP_STATE_SUSPEND:
 4039                         acpi_state = sc->acpi_suspend_sx;
 4040                         break;
 4041                 case POWER_SLEEP_STATE_HIBERNATE:
 4042                         acpi_state = ACPI_STATE_S4;
 4043                         break;
 4044                 default:
 4045                         error = EINVAL;
 4046                         goto out;
 4047                 }
 4048 
 4049                 if (ACPI_FAILURE(acpi_EnterSleepState(sc, acpi_state)))
 4050                         error = ENXIO;
 4051                 break;
 4052         default:
 4053                 error = EINVAL;
 4054                 goto out;
 4055         }
 4056 
 4057 out:
 4058         return (error);
 4059 }
 4060 
 4061 static void
 4062 acpi_pm_register(void *arg)
 4063 {
 4064     if (!cold || resource_disabled("acpi", 0))
 4065         return;
 4066 
 4067     power_pm_register(POWER_PM_TYPE_ACPI, acpi_pm_func, NULL);
 4068 }
 4069 
 4070 SYSINIT(power, SI_SUB_KLD, SI_ORDER_ANY, acpi_pm_register, 0);

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