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/smp.h>
   50 
   51 #include <machine/resource.h>
   52 #include <machine/bus.h>
   53 #include <sys/rman.h>
   54 #include <isa/isavar.h>
   55 #include <isa/pnpvar.h>
   56 
   57 #include <contrib/dev/acpica/acpi.h>
   58 #include <dev/acpica/acpivar.h>
   59 #include <dev/acpica/acpiio.h>
   60 #include <contrib/dev/acpica/achware.h>
   61 #include <contrib/dev/acpica/acnamesp.h>
   62 
   63 #include "pci_if.h"
   64 #include <dev/pci/pcivar.h>
   65 #include <dev/pci/pci_private.h>
   66 
   67 #include <vm/vm_param.h>
   68 
   69 MALLOC_DEFINE(M_ACPIDEV, "acpidev", "ACPI devices");
   70 
   71 /* Hooks for the ACPI CA debugging infrastructure */
   72 #define _COMPONENT      ACPI_BUS
   73 ACPI_MODULE_NAME("ACPI")
   74 
   75 static d_open_t         acpiopen;
   76 static d_close_t        acpiclose;
   77 static d_ioctl_t        acpiioctl;
   78 
   79 static struct cdevsw acpi_cdevsw = {
   80         .d_version =    D_VERSION,
   81         .d_open =       acpiopen,
   82         .d_close =      acpiclose,
   83         .d_ioctl =      acpiioctl,
   84         .d_name =       "acpi",
   85 };
   86 
   87 /* Global mutex for locking access to the ACPI subsystem. */
   88 struct mtx      acpi_mutex;
   89 
   90 /* Bitmap of device quirks. */
   91 int             acpi_quirks;
   92 
   93 static int      acpi_modevent(struct module *mod, int event, void *junk);
   94 static void     acpi_identify(driver_t *driver, device_t parent);
   95 static int      acpi_probe(device_t dev);
   96 static int      acpi_attach(device_t dev);
   97 static int      acpi_suspend(device_t dev);
   98 static int      acpi_resume(device_t dev);
   99 static int      acpi_shutdown(device_t dev);
  100 static device_t acpi_add_child(device_t bus, int order, const char *name,
  101                         int unit);
  102 static int      acpi_print_child(device_t bus, device_t child);
  103 static void     acpi_probe_nomatch(device_t bus, device_t child);
  104 static void     acpi_driver_added(device_t dev, driver_t *driver);
  105 static int      acpi_read_ivar(device_t dev, device_t child, int index,
  106                         uintptr_t *result);
  107 static int      acpi_write_ivar(device_t dev, device_t child, int index,
  108                         uintptr_t value);
  109 static struct resource_list *acpi_get_rlist(device_t dev, device_t child);
  110 static int      acpi_sysres_alloc(device_t dev);
  111 static struct resource *acpi_alloc_resource(device_t bus, device_t child,
  112                         int type, int *rid, u_long start, u_long end,
  113                         u_long count, u_int flags);
  114 static int      acpi_release_resource(device_t bus, device_t child, int type,
  115                         int rid, struct resource *r);
  116 static void     acpi_delete_resource(device_t bus, device_t child, int type,
  117                     int rid);
  118 static uint32_t acpi_isa_get_logicalid(device_t dev);
  119 static int      acpi_isa_get_compatid(device_t dev, uint32_t *cids, int count);
  120 static char     *acpi_device_id_probe(device_t bus, device_t dev, char **ids);
  121 static ACPI_STATUS acpi_device_eval_obj(device_t bus, device_t dev,
  122                     ACPI_STRING pathname, ACPI_OBJECT_LIST *parameters,
  123                     ACPI_BUFFER *ret);
  124 static int      acpi_device_pwr_for_sleep(device_t bus, device_t dev,
  125                     int *dstate);
  126 static ACPI_STATUS acpi_device_scan_cb(ACPI_HANDLE h, UINT32 level,
  127                     void *context, void **retval);
  128 static ACPI_STATUS acpi_device_scan_children(device_t bus, device_t dev,
  129                     int max_depth, acpi_scan_cb_t user_fn, void *arg);
  130 static int      acpi_set_powerstate_method(device_t bus, device_t child,
  131                     int state);
  132 static int      acpi_isa_pnp_probe(device_t bus, device_t child,
  133                     struct isa_pnp_id *ids);
  134 static void     acpi_probe_children(device_t bus);
  135 static void     acpi_probe_order(ACPI_HANDLE handle, int *order);
  136 static ACPI_STATUS acpi_probe_child(ACPI_HANDLE handle, UINT32 level,
  137                     void *context, void **status);
  138 static BOOLEAN  acpi_MatchHid(ACPI_HANDLE h, const char *hid);
  139 static ACPI_STATUS acpi_EnterSleepState(struct acpi_softc *sc, int state);
  140 static void     acpi_shutdown_final(void *arg, int howto);
  141 static void     acpi_enable_fixed_events(struct acpi_softc *sc);
  142 static int      acpi_wake_sleep_prep(ACPI_HANDLE handle, int sstate);
  143 static int      acpi_wake_run_prep(ACPI_HANDLE handle, int sstate);
  144 static int      acpi_wake_prep_walk(int sstate);
  145 static int      acpi_wake_sysctl_walk(device_t dev);
  146 static int      acpi_wake_set_sysctl(SYSCTL_HANDLER_ARGS);
  147 static void     acpi_system_eventhandler_sleep(void *arg, int state);
  148 static void     acpi_system_eventhandler_wakeup(void *arg, int state);
  149 static int      acpi_supported_sleep_state_sysctl(SYSCTL_HANDLER_ARGS);
  150 static int      acpi_sleep_state_sysctl(SYSCTL_HANDLER_ARGS);
  151 static int      acpi_pm_func(u_long cmd, void *arg, ...);
  152 static int      acpi_child_location_str_method(device_t acdev, device_t child,
  153                                                char *buf, size_t buflen);
  154 static int      acpi_child_pnpinfo_str_method(device_t acdev, device_t child,
  155                                               char *buf, size_t buflen);
  156 
  157 static device_method_t acpi_methods[] = {
  158     /* Device interface */
  159     DEVMETHOD(device_identify,          acpi_identify),
  160     DEVMETHOD(device_probe,             acpi_probe),
  161     DEVMETHOD(device_attach,            acpi_attach),
  162     DEVMETHOD(device_shutdown,          acpi_shutdown),
  163     DEVMETHOD(device_detach,            bus_generic_detach),
  164     DEVMETHOD(device_suspend,           acpi_suspend),
  165     DEVMETHOD(device_resume,            acpi_resume),
  166 
  167     /* Bus interface */
  168     DEVMETHOD(bus_add_child,            acpi_add_child),
  169     DEVMETHOD(bus_print_child,          acpi_print_child),
  170     DEVMETHOD(bus_probe_nomatch,        acpi_probe_nomatch),
  171     DEVMETHOD(bus_driver_added,         acpi_driver_added),
  172     DEVMETHOD(bus_read_ivar,            acpi_read_ivar),
  173     DEVMETHOD(bus_write_ivar,           acpi_write_ivar),
  174     DEVMETHOD(bus_get_resource_list,    acpi_get_rlist),
  175     DEVMETHOD(bus_set_resource,         bus_generic_rl_set_resource),
  176     DEVMETHOD(bus_get_resource,         bus_generic_rl_get_resource),
  177     DEVMETHOD(bus_alloc_resource,       acpi_alloc_resource),
  178     DEVMETHOD(bus_release_resource,     acpi_release_resource),
  179     DEVMETHOD(bus_delete_resource,      acpi_delete_resource),
  180     DEVMETHOD(bus_child_pnpinfo_str,    acpi_child_pnpinfo_str_method),
  181     DEVMETHOD(bus_child_location_str,   acpi_child_location_str_method),
  182     DEVMETHOD(bus_activate_resource,    bus_generic_activate_resource),
  183     DEVMETHOD(bus_deactivate_resource,  bus_generic_deactivate_resource),
  184     DEVMETHOD(bus_setup_intr,           bus_generic_setup_intr),
  185     DEVMETHOD(bus_teardown_intr,        bus_generic_teardown_intr),
  186 
  187     /* ACPI bus */
  188     DEVMETHOD(acpi_id_probe,            acpi_device_id_probe),
  189     DEVMETHOD(acpi_evaluate_object,     acpi_device_eval_obj),
  190     DEVMETHOD(acpi_pwr_for_sleep,       acpi_device_pwr_for_sleep),
  191     DEVMETHOD(acpi_scan_children,       acpi_device_scan_children),
  192 
  193     /* PCI emulation */
  194     DEVMETHOD(pci_set_powerstate,       acpi_set_powerstate_method),
  195 
  196     /* ISA emulation */
  197     DEVMETHOD(isa_pnp_probe,            acpi_isa_pnp_probe),
  198 
  199     {0, 0}
  200 };
  201 
  202 static driver_t acpi_driver = {
  203     "acpi",
  204     acpi_methods,
  205     sizeof(struct acpi_softc),
  206 };
  207 
  208 static devclass_t acpi_devclass;
  209 DRIVER_MODULE(acpi, nexus, acpi_driver, acpi_devclass, acpi_modevent, 0);
  210 MODULE_VERSION(acpi, 1);
  211 
  212 ACPI_SERIAL_DECL(acpi, "ACPI root bus");
  213 
  214 /* Local pools for managing system resources for ACPI child devices. */
  215 static struct rman acpi_rman_io, acpi_rman_mem;
  216 
  217 #define ACPI_MINIMUM_AWAKETIME  5
  218 
  219 static const char* sleep_state_names[] = {
  220     "S0", "S1", "S2", "S3", "S4", "S5", "NONE"};
  221 
  222 SYSCTL_NODE(_debug, OID_AUTO, acpi, CTLFLAG_RD, NULL, "ACPI debugging");
  223 static char acpi_ca_version[12];
  224 SYSCTL_STRING(_debug_acpi, OID_AUTO, acpi_ca_version, CTLFLAG_RD,
  225               acpi_ca_version, 0, "Version of Intel ACPI-CA");
  226 
  227 /*
  228  * Allow override of whether methods execute in parallel or not.
  229  * Enable this for serial behavior, which fixes "AE_ALREADY_EXISTS"
  230  * errors for AML that really can't handle parallel method execution.
  231  * It is off by default since this breaks recursive methods and
  232  * some IBMs use such code.
  233  */
  234 static int acpi_serialize_methods;
  235 TUNABLE_INT("hw.acpi.serialize_methods", &acpi_serialize_methods);
  236 
  237 /* Power devices off and on in suspend and resume.  XXX Remove once tested. */
  238 static int acpi_do_powerstate = 1;
  239 TUNABLE_INT("debug.acpi.do_powerstate", &acpi_do_powerstate);
  240 SYSCTL_INT(_debug_acpi, OID_AUTO, do_powerstate, CTLFLAG_RW,
  241     &acpi_do_powerstate, 1, "Turn off devices when suspending.");
  242 
  243 /* Allow users to override quirks. */
  244 TUNABLE_INT("debug.acpi.quirks", &acpi_quirks);
  245 
  246 static int acpi_susp_bounce;
  247 SYSCTL_INT(_debug_acpi, OID_AUTO, suspend_bounce, CTLFLAG_RW,
  248     &acpi_susp_bounce, 0, "Don't actually suspend, just test devices.");
  249 
  250 /*
  251  * ACPI can only be loaded as a module by the loader; activating it after
  252  * system bootstrap time is not useful, and can be fatal to the system.
  253  * It also cannot be unloaded, since the entire system bus heirarchy hangs
  254  * off it.
  255  */
  256 static int
  257 acpi_modevent(struct module *mod, int event, void *junk)
  258 {
  259     switch (event) {
  260     case MOD_LOAD:
  261         if (!cold) {
  262             printf("The ACPI driver cannot be loaded after boot.\n");
  263             return (EPERM);
  264         }
  265         break;
  266     case MOD_UNLOAD:
  267         if (!cold && power_pm_get_type() == POWER_PM_TYPE_ACPI)
  268             return (EBUSY);
  269         break;
  270     default:
  271         break;
  272     }
  273     return (0);
  274 }
  275 
  276 /*
  277  * Perform early initialization.
  278  */
  279 ACPI_STATUS
  280 acpi_Startup(void)
  281 {
  282     static int started = 0;
  283     ACPI_STATUS status;
  284     int val;
  285 
  286     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  287 
  288     /* Only run the startup code once.  The MADT driver also calls this. */
  289     if (started)
  290         return_VALUE (AE_OK);
  291     started = 1;
  292 
  293     /*
  294      * Pre-allocate space for RSDT/XSDT and DSDT tables and allow resizing
  295      * if more tables exist.
  296      */
  297     if (ACPI_FAILURE(status = AcpiInitializeTables(NULL, 2, TRUE))) {
  298         printf("ACPI: Table initialisation failed: %s\n",
  299             AcpiFormatException(status));
  300         return_VALUE (status);
  301     }
  302 
  303     /* Set up any quirks we have for this system. */
  304     if (acpi_quirks == ACPI_Q_OK)
  305         acpi_table_quirks(&acpi_quirks);
  306 
  307     /* If the user manually set the disabled hint to 0, force-enable ACPI. */
  308     if (resource_int_value("acpi", 0, "disabled", &val) == 0 && val == 0)
  309         acpi_quirks &= ~ACPI_Q_BROKEN;
  310     if (acpi_quirks & ACPI_Q_BROKEN) {
  311         printf("ACPI disabled by blacklist.  Contact your BIOS vendor.\n");
  312         status = AE_SUPPORT;
  313     }
  314 
  315     return_VALUE (status);
  316 }
  317 
  318 /*
  319  * Detect ACPI, perform early initialisation
  320  */
  321 static void
  322 acpi_identify(driver_t *driver, device_t parent)
  323 {
  324     device_t    child;
  325 
  326     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  327 
  328     if (!cold)
  329         return_VOID;
  330 
  331     /* Check that we haven't been disabled with a hint. */
  332     if (resource_disabled("acpi", 0))
  333         return_VOID;
  334 
  335     /* Make sure we're not being doubly invoked. */
  336     if (device_find_child(parent, "acpi", 0) != NULL)
  337         return_VOID;
  338 
  339     snprintf(acpi_ca_version, sizeof(acpi_ca_version), "%x", ACPI_CA_VERSION);
  340 
  341     /* Initialize root tables. */
  342     if (ACPI_FAILURE(acpi_Startup())) {
  343         printf("ACPI: Try disabling either ACPI or apic support.\n");
  344         return_VOID;
  345     }
  346 
  347     /* Attach the actual ACPI device. */
  348     if ((child = BUS_ADD_CHILD(parent, 10, "acpi", 0)) == NULL) {
  349         device_printf(parent, "device_identify failed\n");
  350         return_VOID;
  351     }
  352 }
  353 
  354 /*
  355  * Fetch some descriptive data from ACPI to put in our attach message.
  356  */
  357 static int
  358 acpi_probe(device_t dev)
  359 {
  360     ACPI_TABLE_RSDP     *rsdp;
  361     ACPI_TABLE_HEADER   *rsdt;
  362     ACPI_PHYSICAL_ADDRESS paddr;
  363     char                buf[ACPI_OEM_ID_SIZE + ACPI_OEM_TABLE_ID_SIZE + 2];
  364     struct sbuf         sb;
  365 
  366     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  367 
  368     if (power_pm_get_type() != POWER_PM_TYPE_NONE &&
  369         power_pm_get_type() != POWER_PM_TYPE_ACPI) {
  370         device_printf(dev, "probe failed, other PM system enabled.\n");
  371         return_VALUE (ENXIO);
  372     }
  373 
  374     if ((paddr = AcpiOsGetRootPointer()) == 0 ||
  375         (rsdp = AcpiOsMapMemory(paddr, sizeof(ACPI_TABLE_RSDP))) == NULL)
  376         return_VALUE (ENXIO);
  377     if (rsdp->Revision > 1 && rsdp->XsdtPhysicalAddress != 0)
  378         paddr = (ACPI_PHYSICAL_ADDRESS)rsdp->XsdtPhysicalAddress;
  379     else
  380         paddr = (ACPI_PHYSICAL_ADDRESS)rsdp->RsdtPhysicalAddress;
  381     AcpiOsUnmapMemory(rsdp, sizeof(ACPI_TABLE_RSDP));
  382 
  383     if ((rsdt = AcpiOsMapMemory(paddr, sizeof(ACPI_TABLE_HEADER))) == NULL)
  384         return_VALUE (ENXIO);
  385     sbuf_new(&sb, buf, sizeof(buf), SBUF_FIXEDLEN);
  386     sbuf_bcat(&sb, rsdt->OemId, ACPI_OEM_ID_SIZE);
  387     sbuf_trim(&sb);
  388     sbuf_putc(&sb, ' ');
  389     sbuf_bcat(&sb, rsdt->OemTableId, ACPI_OEM_TABLE_ID_SIZE);
  390     sbuf_trim(&sb);
  391     sbuf_finish(&sb);
  392     device_set_desc_copy(dev, sbuf_data(&sb));
  393     sbuf_delete(&sb);
  394     AcpiOsUnmapMemory(rsdt, sizeof(ACPI_TABLE_HEADER));
  395 
  396     return_VALUE (0);
  397 }
  398 
  399 static int
  400 acpi_attach(device_t dev)
  401 {
  402     struct acpi_softc   *sc;
  403     ACPI_TABLE_FACS     *facs;
  404     ACPI_STATUS         status;
  405     int                 error, state;
  406     UINT32              flags;
  407     UINT8               TypeA, TypeB;
  408     char                *env;
  409 
  410     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  411 
  412     sc = device_get_softc(dev);
  413     sc->acpi_dev = dev;
  414     callout_init(&sc->susp_force_to, TRUE);
  415 
  416     error = ENXIO;
  417 
  418     /* Initialize resource manager. */
  419     acpi_rman_io.rm_type = RMAN_ARRAY;
  420     acpi_rman_io.rm_start = 0;
  421     acpi_rman_io.rm_end = 0xffff;
  422     acpi_rman_io.rm_descr = "ACPI I/O ports";
  423     if (rman_init(&acpi_rman_io) != 0)
  424         panic("acpi rman_init IO ports failed");
  425     acpi_rman_mem.rm_type = RMAN_ARRAY;
  426     acpi_rman_mem.rm_start = 0;
  427     acpi_rman_mem.rm_end = ~0ul;
  428     acpi_rman_mem.rm_descr = "ACPI I/O memory addresses";
  429     if (rman_init(&acpi_rman_mem) != 0)
  430         panic("acpi rman_init memory failed");
  431 
  432     /* Initialise the ACPI mutex */
  433     mtx_init(&acpi_mutex, "ACPI global lock", NULL, MTX_DEF);
  434 
  435     /*
  436      * Set the globals from our tunables.  This is needed because ACPI-CA
  437      * uses UINT8 for some values and we have no tunable_byte.
  438      */
  439     AcpiGbl_AllMethodsSerialized = acpi_serialize_methods;
  440     AcpiGbl_EnableInterpreterSlack = TRUE;
  441 
  442     /* Start up the ACPI CA subsystem. */
  443     status = AcpiInitializeSubsystem();
  444     if (ACPI_FAILURE(status)) {
  445         device_printf(dev, "Could not initialize Subsystem: %s\n",
  446                       AcpiFormatException(status));
  447         goto out;
  448     }
  449 
  450     /* Load ACPI name space. */
  451     status = AcpiLoadTables();
  452     if (ACPI_FAILURE(status)) {
  453         device_printf(dev, "Could not load Namespace: %s\n",
  454                       AcpiFormatException(status));
  455         goto out;
  456     }
  457 
  458     /* Install the default address space handlers. */
  459     status = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
  460                 ACPI_ADR_SPACE_SYSTEM_MEMORY, ACPI_DEFAULT_HANDLER, NULL, NULL);
  461     if (ACPI_FAILURE(status)) {
  462         device_printf(dev, "Could not initialise SystemMemory handler: %s\n",
  463                       AcpiFormatException(status));
  464         goto out;
  465     }
  466     status = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
  467                 ACPI_ADR_SPACE_SYSTEM_IO, ACPI_DEFAULT_HANDLER, NULL, NULL);
  468     if (ACPI_FAILURE(status)) {
  469         device_printf(dev, "Could not initialise SystemIO handler: %s\n",
  470                       AcpiFormatException(status));
  471         goto out;
  472     }
  473     status = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
  474                 ACPI_ADR_SPACE_PCI_CONFIG, ACPI_DEFAULT_HANDLER, NULL, NULL);
  475     if (ACPI_FAILURE(status)) {
  476         device_printf(dev, "could not initialise PciConfig handler: %s\n",
  477                       AcpiFormatException(status));
  478         goto out;
  479     }
  480 
  481     /*
  482      * Note that some systems (specifically, those with namespace evaluation
  483      * issues that require the avoidance of parts of the namespace) must
  484      * avoid running _INI and _STA on everything, as well as dodging the final
  485      * object init pass.
  486      *
  487      * For these devices, we set ACPI_NO_DEVICE_INIT and ACPI_NO_OBJECT_INIT).
  488      *
  489      * XXX We should arrange for the object init pass after we have attached
  490      *     all our child devices, but on many systems it works here.
  491      */
  492     flags = 0;
  493     if (testenv("debug.acpi.avoid"))
  494         flags = ACPI_NO_DEVICE_INIT | ACPI_NO_OBJECT_INIT;
  495 
  496     /* Bring the hardware and basic handlers online. */
  497     if (ACPI_FAILURE(status = AcpiEnableSubsystem(flags))) {
  498         device_printf(dev, "Could not enable ACPI: %s\n",
  499                       AcpiFormatException(status));
  500         goto out;
  501     }
  502 
  503     /*
  504      * Call the ECDT probe function to provide EC functionality before
  505      * the namespace has been evaluated.
  506      *
  507      * XXX This happens before the sysresource devices have been probed and
  508      * attached so its resources come from nexus0.  In practice, this isn't
  509      * a problem but should be addressed eventually.
  510      */
  511     acpi_ec_ecdt_probe(dev);
  512 
  513     /* Bring device objects and regions online. */
  514     if (ACPI_FAILURE(status = AcpiInitializeObjects(flags))) {
  515         device_printf(dev, "Could not initialize ACPI objects: %s\n",
  516                       AcpiFormatException(status));
  517         goto out;
  518     }
  519 
  520     /*
  521      * Setup our sysctl tree.
  522      *
  523      * XXX: This doesn't check to make sure that none of these fail.
  524      */
  525     sysctl_ctx_init(&sc->acpi_sysctl_ctx);
  526     sc->acpi_sysctl_tree = SYSCTL_ADD_NODE(&sc->acpi_sysctl_ctx,
  527                                SYSCTL_STATIC_CHILDREN(_hw), OID_AUTO,
  528                                device_get_name(dev), CTLFLAG_RD, 0, "");
  529     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  530         OID_AUTO, "supported_sleep_state", CTLTYPE_STRING | CTLFLAG_RD,
  531         0, 0, acpi_supported_sleep_state_sysctl, "A", "");
  532     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  533         OID_AUTO, "power_button_state", CTLTYPE_STRING | CTLFLAG_RW,
  534         &sc->acpi_power_button_sx, 0, acpi_sleep_state_sysctl, "A", "");
  535     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  536         OID_AUTO, "sleep_button_state", CTLTYPE_STRING | CTLFLAG_RW,
  537         &sc->acpi_sleep_button_sx, 0, acpi_sleep_state_sysctl, "A", "");
  538     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  539         OID_AUTO, "lid_switch_state", CTLTYPE_STRING | CTLFLAG_RW,
  540         &sc->acpi_lid_switch_sx, 0, acpi_sleep_state_sysctl, "A", "");
  541     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  542         OID_AUTO, "standby_state", CTLTYPE_STRING | CTLFLAG_RW,
  543         &sc->acpi_standby_sx, 0, acpi_sleep_state_sysctl, "A", "");
  544     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  545         OID_AUTO, "suspend_state", CTLTYPE_STRING | CTLFLAG_RW,
  546         &sc->acpi_suspend_sx, 0, acpi_sleep_state_sysctl, "A", "");
  547     SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  548         OID_AUTO, "sleep_delay", CTLFLAG_RW, &sc->acpi_sleep_delay, 0,
  549         "sleep delay");
  550     SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  551         OID_AUTO, "s4bios", CTLFLAG_RW, &sc->acpi_s4bios, 0, "S4BIOS mode");
  552     SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  553         OID_AUTO, "verbose", CTLFLAG_RW, &sc->acpi_verbose, 0, "verbose mode");
  554     SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  555         OID_AUTO, "disable_on_reboot", CTLFLAG_RW,
  556         &sc->acpi_do_disable, 0, "Disable ACPI when rebooting/halting system");
  557     SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  558         OID_AUTO, "handle_reboot", CTLFLAG_RW,
  559         &sc->acpi_handle_reboot, 0, "Use ACPI Reset Register to reboot");
  560 
  561     /*
  562      * Default to 1 second before sleeping to give some machines time to
  563      * stabilize.
  564      */
  565     sc->acpi_sleep_delay = 1;
  566     if (bootverbose)
  567         sc->acpi_verbose = 1;
  568     if ((env = getenv("hw.acpi.verbose")) != NULL) {
  569         if (strcmp(env, "") != 0)
  570             sc->acpi_verbose = 1;
  571         freeenv(env);
  572     }
  573 
  574     /* Only enable S4BIOS by default if the FACS says it is available. */
  575     status = AcpiGetTable(ACPI_SIG_FACS, 0, (ACPI_TABLE_HEADER **)&facs);
  576     if (ACPI_FAILURE(status)) {
  577         device_printf(dev, "couldn't get FACS: %s\n",
  578                       AcpiFormatException(status));
  579         error = ENXIO;
  580         goto out;
  581     }
  582     if (facs->Flags & ACPI_FACS_S4_BIOS_PRESENT)
  583         sc->acpi_s4bios = 1;
  584 
  585     /*
  586      * Dispatch the default sleep state to devices.  The lid switch is set
  587      * to NONE by default to avoid surprising users.
  588      */
  589     sc->acpi_power_button_sx = ACPI_STATE_S5;
  590     sc->acpi_lid_switch_sx = ACPI_S_STATES_MAX + 1;
  591     sc->acpi_standby_sx = ACPI_STATE_S1;
  592     sc->acpi_suspend_sx = ACPI_STATE_S3;
  593 
  594     /* Pick the first valid sleep state for the sleep button default. */
  595     sc->acpi_sleep_button_sx = ACPI_S_STATES_MAX + 1;
  596     for (state = ACPI_STATE_S1; state <= ACPI_STATE_S4; state++)
  597         if (ACPI_SUCCESS(AcpiGetSleepTypeData(state, &TypeA, &TypeB))) {
  598             sc->acpi_sleep_button_sx = state;
  599             break;
  600         }
  601 
  602     acpi_enable_fixed_events(sc);
  603 
  604     /*
  605      * Scan the namespace and attach/initialise children.
  606      */
  607 
  608     /* Register our shutdown handler. */
  609     EVENTHANDLER_REGISTER(shutdown_final, acpi_shutdown_final, sc,
  610         SHUTDOWN_PRI_LAST);
  611 
  612     /*
  613      * Register our acpi event handlers.
  614      * XXX should be configurable eg. via userland policy manager.
  615      */
  616     EVENTHANDLER_REGISTER(acpi_sleep_event, acpi_system_eventhandler_sleep,
  617         sc, ACPI_EVENT_PRI_LAST);
  618     EVENTHANDLER_REGISTER(acpi_wakeup_event, acpi_system_eventhandler_wakeup,
  619         sc, ACPI_EVENT_PRI_LAST);
  620 
  621     /* Flag our initial states. */
  622     sc->acpi_enabled = 1;
  623     sc->acpi_sstate = ACPI_STATE_S0;
  624     sc->acpi_sleep_disabled = 0;
  625 
  626     /* Create the control device */
  627     sc->acpi_dev_t = make_dev(&acpi_cdevsw, 0, UID_ROOT, GID_WHEEL, 0644,
  628                               "acpi");
  629     sc->acpi_dev_t->si_drv1 = sc;
  630 
  631     if ((error = acpi_machdep_init(dev)))
  632         goto out;
  633 
  634     /* Register ACPI again to pass the correct argument of pm_func. */
  635     power_pm_register(POWER_PM_TYPE_ACPI, acpi_pm_func, sc);
  636 
  637     if (!acpi_disabled("bus"))
  638         acpi_probe_children(dev);
  639 
  640     error = 0;
  641 
  642  out:
  643     return_VALUE (error);
  644 }
  645 
  646 static int
  647 acpi_suspend(device_t dev)
  648 {
  649     device_t child, *devlist;
  650     int error, i, numdevs, pstate;
  651 
  652     GIANT_REQUIRED;
  653 
  654     /* First give child devices a chance to suspend. */
  655     error = bus_generic_suspend(dev);
  656     if (error)
  657         return (error);
  658 
  659     /*
  660      * Now, set them into the appropriate power state, usually D3.  If the
  661      * device has an _SxD method for the next sleep state, use that power
  662      * state instead.
  663      */
  664     device_get_children(dev, &devlist, &numdevs);
  665     for (i = 0; i < numdevs; i++) {
  666         /* If the device is not attached, we've powered it down elsewhere. */
  667         child = devlist[i];
  668         if (!device_is_attached(child))
  669             continue;
  670 
  671         /*
  672          * Default to D3 for all sleep states.  The _SxD method is optional
  673          * so set the powerstate even if it's absent.
  674          */
  675         pstate = PCI_POWERSTATE_D3;
  676         error = acpi_device_pwr_for_sleep(device_get_parent(child),
  677             child, &pstate);
  678         if ((error == 0 || error == ESRCH) && acpi_do_powerstate)
  679             pci_set_powerstate(child, pstate);
  680     }
  681     free(devlist, M_TEMP);
  682     error = 0;
  683 
  684     return (error);
  685 }
  686 
  687 static int
  688 acpi_resume(device_t dev)
  689 {
  690     ACPI_HANDLE handle;
  691     int i, numdevs;
  692     device_t child, *devlist;
  693 
  694     GIANT_REQUIRED;
  695 
  696     /*
  697      * Put all devices in D0 before resuming them.  Call _S0D on each one
  698      * since some systems expect this.
  699      */
  700     device_get_children(dev, &devlist, &numdevs);
  701     for (i = 0; i < numdevs; i++) {
  702         child = devlist[i];
  703         handle = acpi_get_handle(child);
  704         if (handle)
  705             AcpiEvaluateObject(handle, "_S0D", NULL, NULL);
  706         if (device_is_attached(child) && acpi_do_powerstate)
  707             pci_set_powerstate(child, PCI_POWERSTATE_D0);
  708     }
  709     free(devlist, M_TEMP);
  710 
  711     return (bus_generic_resume(dev));
  712 }
  713 
  714 static int
  715 acpi_shutdown(device_t dev)
  716 {
  717 
  718     GIANT_REQUIRED;
  719 
  720     /* Allow children to shutdown first. */
  721     bus_generic_shutdown(dev);
  722 
  723     /*
  724      * Enable any GPEs that are able to power-on the system (i.e., RTC).
  725      * Also, disable any that are not valid for this state (most).
  726      */
  727     acpi_wake_prep_walk(ACPI_STATE_S5);
  728 
  729     return (0);
  730 }
  731 
  732 /*
  733  * Handle a new device being added
  734  */
  735 static device_t
  736 acpi_add_child(device_t bus, int order, const char *name, int unit)
  737 {
  738     struct acpi_device  *ad;
  739     device_t            child;
  740 
  741     if ((ad = malloc(sizeof(*ad), M_ACPIDEV, M_NOWAIT | M_ZERO)) == NULL)
  742         return (NULL);
  743 
  744     resource_list_init(&ad->ad_rl);
  745 
  746     child = device_add_child_ordered(bus, order, name, unit);
  747     if (child != NULL)
  748         device_set_ivars(child, ad);
  749     else
  750         free(ad, M_ACPIDEV);
  751     return (child);
  752 }
  753 
  754 static int
  755 acpi_print_child(device_t bus, device_t child)
  756 {
  757     struct acpi_device   *adev = device_get_ivars(child);
  758     struct resource_list *rl = &adev->ad_rl;
  759     int retval = 0;
  760 
  761     retval += bus_print_child_header(bus, child);
  762     retval += resource_list_print_type(rl, "port",  SYS_RES_IOPORT, "%#lx");
  763     retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
  764     retval += resource_list_print_type(rl, "irq",   SYS_RES_IRQ,    "%ld");
  765     retval += resource_list_print_type(rl, "drq",   SYS_RES_DRQ,    "%ld");
  766     if (device_get_flags(child))
  767         retval += printf(" flags %#x", device_get_flags(child));
  768     retval += bus_print_child_footer(bus, child);
  769 
  770     return (retval);
  771 }
  772 
  773 /*
  774  * If this device is an ACPI child but no one claimed it, attempt
  775  * to power it off.  We'll power it back up when a driver is added.
  776  *
  777  * XXX Disabled for now since many necessary devices (like fdc and
  778  * ATA) don't claim the devices we created for them but still expect
  779  * them to be powered up.
  780  */
  781 static void
  782 acpi_probe_nomatch(device_t bus, device_t child)
  783 {
  784 
  785     /* pci_set_powerstate(child, PCI_POWERSTATE_D3); */
  786 }
  787 
  788 /*
  789  * If a new driver has a chance to probe a child, first power it up.
  790  *
  791  * XXX Disabled for now (see acpi_probe_nomatch for details).
  792  */
  793 static void
  794 acpi_driver_added(device_t dev, driver_t *driver)
  795 {
  796     device_t child, *devlist;
  797     int i, numdevs;
  798 
  799     DEVICE_IDENTIFY(driver, dev);
  800     device_get_children(dev, &devlist, &numdevs);
  801     for (i = 0; i < numdevs; i++) {
  802         child = devlist[i];
  803         if (device_get_state(child) == DS_NOTPRESENT) {
  804             /* pci_set_powerstate(child, PCI_POWERSTATE_D0); */
  805             if (device_probe_and_attach(child) != 0)
  806                 ; /* pci_set_powerstate(child, PCI_POWERSTATE_D3); */
  807         }
  808     }
  809     free(devlist, M_TEMP);
  810 }
  811 
  812 /* Location hint for devctl(8) */
  813 static int
  814 acpi_child_location_str_method(device_t cbdev, device_t child, char *buf,
  815     size_t buflen)
  816 {
  817     struct acpi_device *dinfo = device_get_ivars(child);
  818 
  819     if (dinfo->ad_handle)
  820         snprintf(buf, buflen, "handle=%s", acpi_name(dinfo->ad_handle));
  821     else
  822         snprintf(buf, buflen, "unknown");
  823     return (0);
  824 }
  825 
  826 /* PnP information for devctl(8) */
  827 static int
  828 acpi_child_pnpinfo_str_method(device_t cbdev, device_t child, char *buf,
  829     size_t buflen)
  830 {
  831     ACPI_BUFFER adbuf = {ACPI_ALLOCATE_BUFFER, NULL}; 
  832     ACPI_DEVICE_INFO *adinfo;
  833     struct acpi_device *dinfo = device_get_ivars(child);
  834     char *end;
  835     int error;
  836 
  837     error = AcpiGetObjectInfo(dinfo->ad_handle, &adbuf);
  838     adinfo = (ACPI_DEVICE_INFO *) adbuf.Pointer;
  839     if (error)
  840         snprintf(buf, buflen, "unknown");
  841     else
  842         snprintf(buf, buflen, "_HID=%s _UID=%lu",
  843                  (adinfo->Valid & ACPI_VALID_HID) ?
  844                  adinfo->HardwareId.Value : "none",
  845                  (adinfo->Valid & ACPI_VALID_UID) ?
  846                  strtoul(adinfo->UniqueId.Value, &end, 10) : 0);
  847     if (adinfo)
  848         AcpiOsFree(adinfo);
  849 
  850     return (0);
  851 }
  852 
  853 /*
  854  * Handle per-device ivars
  855  */
  856 static int
  857 acpi_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
  858 {
  859     struct acpi_device  *ad;
  860 
  861     if ((ad = device_get_ivars(child)) == NULL) {
  862         printf("device has no ivars\n");
  863         return (ENOENT);
  864     }
  865 
  866     /* ACPI and ISA compatibility ivars */
  867     switch(index) {
  868     case ACPI_IVAR_HANDLE:
  869         *(ACPI_HANDLE *)result = ad->ad_handle;
  870         break;
  871     case ACPI_IVAR_MAGIC:
  872         *(uintptr_t *)result = ad->ad_magic;
  873         break;
  874     case ACPI_IVAR_PRIVATE:
  875         *(void **)result = ad->ad_private;
  876         break;
  877     case ACPI_IVAR_FLAGS:
  878         *(int *)result = ad->ad_flags;
  879         break;
  880     case ISA_IVAR_VENDORID:
  881     case ISA_IVAR_SERIAL:
  882     case ISA_IVAR_COMPATID:
  883         *(int *)result = -1;
  884         break;
  885     case ISA_IVAR_LOGICALID:
  886         *(int *)result = acpi_isa_get_logicalid(child);
  887         break;
  888     default:
  889         return (ENOENT);
  890     }
  891 
  892     return (0);
  893 }
  894 
  895 static int
  896 acpi_write_ivar(device_t dev, device_t child, int index, uintptr_t value)
  897 {
  898     struct acpi_device  *ad;
  899 
  900     if ((ad = device_get_ivars(child)) == NULL) {
  901         printf("device has no ivars\n");
  902         return (ENOENT);
  903     }
  904 
  905     switch(index) {
  906     case ACPI_IVAR_HANDLE:
  907         ad->ad_handle = (ACPI_HANDLE)value;
  908         break;
  909     case ACPI_IVAR_MAGIC:
  910         ad->ad_magic = (uintptr_t)value;
  911         break;
  912     case ACPI_IVAR_PRIVATE:
  913         ad->ad_private = (void *)value;
  914         break;
  915     case ACPI_IVAR_FLAGS:
  916         ad->ad_flags = (int)value;
  917         break;
  918     default:
  919         panic("bad ivar write request (%d)", index);
  920         return (ENOENT);
  921     }
  922 
  923     return (0);
  924 }
  925 
  926 /*
  927  * Handle child resource allocation/removal
  928  */
  929 static struct resource_list *
  930 acpi_get_rlist(device_t dev, device_t child)
  931 {
  932     struct acpi_device          *ad;
  933 
  934     ad = device_get_ivars(child);
  935     return (&ad->ad_rl);
  936 }
  937 
  938 /*
  939  * Pre-allocate/manage all memory and IO resources.  Since rman can't handle
  940  * duplicates, we merge any in the sysresource attach routine.
  941  */
  942 static int
  943 acpi_sysres_alloc(device_t dev)
  944 {
  945     struct resource *res;
  946     struct resource_list *rl;
  947     struct resource_list_entry *rle;
  948     struct rman *rm;
  949     char *sysres_ids[] = { "PNP0C01", "PNP0C02", NULL };
  950     device_t *children;
  951     int child_count, i;
  952 
  953     /*
  954      * Probe/attach any sysresource devices.  This would be unnecessary if we
  955      * had multi-pass probe/attach.
  956      */
  957     if (device_get_children(dev, &children, &child_count) != 0)
  958         return (ENXIO);
  959     for (i = 0; i < child_count; i++) {
  960         if (ACPI_ID_PROBE(dev, children[i], sysres_ids) != NULL)
  961             device_probe_and_attach(children[i]);
  962     }
  963     free(children, M_TEMP);
  964 
  965     rl = BUS_GET_RESOURCE_LIST(device_get_parent(dev), dev);
  966     STAILQ_FOREACH(rle, rl, link) {
  967         if (rle->res != NULL) {
  968             device_printf(dev, "duplicate resource for %lx\n", rle->start);
  969             continue;
  970         }
  971 
  972         /* Only memory and IO resources are valid here. */
  973         switch (rle->type) {
  974         case SYS_RES_IOPORT:
  975             rm = &acpi_rman_io;
  976             break;
  977         case SYS_RES_MEMORY:
  978             rm = &acpi_rman_mem;
  979             break;
  980         default:
  981             continue;
  982         }
  983 
  984         /* Pre-allocate resource and add to our rman pool. */
  985         res = BUS_ALLOC_RESOURCE(device_get_parent(dev), dev, rle->type,
  986             &rle->rid, rle->start, rle->start + rle->count - 1, rle->count, 0);
  987         if (res != NULL) {
  988             rman_manage_region(rm, rman_get_start(res), rman_get_end(res));
  989             rle->res = res;
  990         } else
  991             device_printf(dev, "reservation of %lx, %lx (%d) failed\n",
  992                 rle->start, rle->count, rle->type);
  993     }
  994     return (0);
  995 }
  996 
  997 static struct resource *
  998 acpi_alloc_resource(device_t bus, device_t child, int type, int *rid,
  999     u_long start, u_long end, u_long count, u_int flags)
 1000 {
 1001     ACPI_RESOURCE ares;
 1002     struct acpi_device *ad = device_get_ivars(child);
 1003     struct resource_list *rl = &ad->ad_rl;
 1004     struct resource_list_entry *rle;
 1005     struct resource *res;
 1006     struct rman *rm;
 1007 
 1008     res = NULL;
 1009 
 1010     /* We only handle memory and IO resources through rman. */
 1011     switch (type) {
 1012     case SYS_RES_IOPORT:
 1013         rm = &acpi_rman_io;
 1014         break;
 1015     case SYS_RES_MEMORY:
 1016         rm = &acpi_rman_mem;
 1017         break;
 1018     default:
 1019         rm = NULL;
 1020     }
 1021             
 1022     ACPI_SERIAL_BEGIN(acpi);
 1023 
 1024     /*
 1025      * If this is an allocation of the "default" range for a given RID, and
 1026      * we know what the resources for this device are (i.e., they're on the
 1027      * child's resource list), use those start/end values.
 1028      */
 1029     if (bus == device_get_parent(child) && start == 0UL && end == ~0UL) {
 1030         rle = resource_list_find(rl, type, *rid);
 1031         if (rle == NULL)
 1032             goto out;
 1033         start = rle->start;
 1034         end = rle->end;
 1035         count = rle->count;
 1036     }
 1037 
 1038     /*
 1039      * If this is an allocation of a specific range, see if we can satisfy
 1040      * the request from our system resource regions.  If we can't, pass the
 1041      * request up to the parent.
 1042      */
 1043     if (start + count - 1 == end && rm != NULL)
 1044         res = rman_reserve_resource(rm, start, end, count, flags & ~RF_ACTIVE,
 1045             child);
 1046     if (res == NULL) {
 1047         res = BUS_ALLOC_RESOURCE(device_get_parent(bus), child, type, rid,
 1048             start, end, count, flags);
 1049     } else {
 1050         rman_set_rid(res, *rid);
 1051 
 1052         /* If requested, activate the resource using the parent's method. */
 1053         if (flags & RF_ACTIVE)
 1054             if (bus_activate_resource(child, type, *rid, res) != 0) {
 1055                 rman_release_resource(res);
 1056                 res = NULL;
 1057                 goto out;
 1058             }
 1059     }
 1060 
 1061     if (res != NULL && device_get_parent(child) == bus)
 1062         switch (type) {
 1063         case SYS_RES_IRQ:
 1064             /*
 1065              * Since bus_config_intr() takes immediate effect, we cannot
 1066              * configure the interrupt associated with a device when we
 1067              * parse the resources but have to defer it until a driver
 1068              * actually allocates the interrupt via bus_alloc_resource().
 1069              *
 1070              * XXX: Should we handle the lookup failing?
 1071              */
 1072             if (ACPI_SUCCESS(acpi_lookup_irq_resource(child, *rid, res, &ares)))
 1073                 acpi_config_intr(child, &ares);
 1074             break;
 1075         }
 1076 
 1077 out:
 1078     ACPI_SERIAL_END(acpi);
 1079     return (res);
 1080 }
 1081 
 1082 static int
 1083 acpi_release_resource(device_t bus, device_t child, int type, int rid,
 1084     struct resource *r)
 1085 {
 1086     struct rman *rm;
 1087     int ret;
 1088 
 1089     /* We only handle memory and IO resources through rman. */
 1090     switch (type) {
 1091     case SYS_RES_IOPORT:
 1092         rm = &acpi_rman_io;
 1093         break;
 1094     case SYS_RES_MEMORY:
 1095         rm = &acpi_rman_mem;
 1096         break;
 1097     default:
 1098         rm = NULL;
 1099     }
 1100 
 1101     ACPI_SERIAL_BEGIN(acpi);
 1102 
 1103     /*
 1104      * If this resource belongs to one of our internal managers,
 1105      * deactivate it and release it to the local pool.  If it doesn't,
 1106      * pass this request up to the parent.
 1107      */
 1108     if (rm != NULL && rman_is_region_manager(r, rm)) {
 1109         if (rman_get_flags(r) & RF_ACTIVE) {
 1110             ret = bus_deactivate_resource(child, type, rid, r);
 1111             if (ret != 0)
 1112                 goto out;
 1113         }
 1114         ret = rman_release_resource(r);
 1115     } else
 1116         ret = BUS_RELEASE_RESOURCE(device_get_parent(bus), child, type, rid, r);
 1117 
 1118 out:
 1119     ACPI_SERIAL_END(acpi);
 1120     return (ret);
 1121 }
 1122 
 1123 static void
 1124 acpi_delete_resource(device_t bus, device_t child, int type, int rid)
 1125 {
 1126     struct resource_list *rl;
 1127 
 1128     rl = acpi_get_rlist(bus, child);
 1129     resource_list_delete(rl, type, rid);
 1130 }
 1131 
 1132 /* Allocate an IO port or memory resource, given its GAS. */
 1133 int
 1134 acpi_bus_alloc_gas(device_t dev, int *type, int *rid, ACPI_GENERIC_ADDRESS *gas,
 1135     struct resource **res, u_int flags)
 1136 {
 1137     int error, res_type;
 1138 
 1139     error = ENOMEM;
 1140     if (type == NULL || rid == NULL || gas == NULL || res == NULL)
 1141         return (EINVAL);
 1142 
 1143     /* We only support memory and IO spaces. */
 1144     switch (gas->SpaceId) {
 1145     case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 1146         res_type = SYS_RES_MEMORY;
 1147         break;
 1148     case ACPI_ADR_SPACE_SYSTEM_IO:
 1149         res_type = SYS_RES_IOPORT;
 1150         break;
 1151     default:
 1152         return (EOPNOTSUPP);
 1153     }
 1154 
 1155     /*
 1156      * If the register width is less than 8, assume the BIOS author means
 1157      * it is a bit field and just allocate a byte.
 1158      */
 1159     if (gas->BitWidth && gas->BitWidth < 8)
 1160         gas->BitWidth = 8;
 1161 
 1162     /* Validate the address after we're sure we support the space. */
 1163     if (gas->Address == 0 || gas->BitWidth == 0)
 1164         return (EINVAL);
 1165 
 1166     bus_set_resource(dev, res_type, *rid, gas->Address,
 1167         gas->BitWidth / 8);
 1168     *res = bus_alloc_resource_any(dev, res_type, rid, RF_ACTIVE | flags);
 1169     if (*res != NULL) {
 1170         *type = res_type;
 1171         error = 0;
 1172     } else
 1173         bus_delete_resource(dev, res_type, *rid);
 1174 
 1175     return (error);
 1176 }
 1177 
 1178 /* Probe _HID and _CID for compatible ISA PNP ids. */
 1179 static uint32_t
 1180 acpi_isa_get_logicalid(device_t dev)
 1181 {
 1182     ACPI_DEVICE_INFO    *devinfo;
 1183     ACPI_BUFFER         buf;
 1184     ACPI_HANDLE         h;
 1185     ACPI_STATUS         error;
 1186     u_int32_t           pnpid;
 1187 
 1188     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 1189 
 1190     pnpid = 0;
 1191     buf.Pointer = NULL;
 1192     buf.Length = ACPI_ALLOCATE_BUFFER;
 1193 
 1194     /* Fetch and validate the HID. */
 1195     if ((h = acpi_get_handle(dev)) == NULL)
 1196         goto out;
 1197     error = AcpiGetObjectInfo(h, &buf);
 1198     if (ACPI_FAILURE(error))
 1199         goto out;
 1200     devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;
 1201 
 1202     if ((devinfo->Valid & ACPI_VALID_HID) != 0)
 1203         pnpid = PNP_EISAID(devinfo->HardwareId.Value);
 1204 
 1205 out:
 1206     if (buf.Pointer != NULL)
 1207         AcpiOsFree(buf.Pointer);
 1208     return_VALUE (pnpid);
 1209 }
 1210 
 1211 static int
 1212 acpi_isa_get_compatid(device_t dev, uint32_t *cids, int count)
 1213 {
 1214     ACPI_DEVICE_INFO    *devinfo;
 1215     ACPI_BUFFER         buf;
 1216     ACPI_HANDLE         h;
 1217     ACPI_STATUS         error;
 1218     uint32_t            *pnpid;
 1219     int                 valid, i;
 1220 
 1221     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 1222 
 1223     pnpid = cids;
 1224     valid = 0;
 1225     buf.Pointer = NULL;
 1226     buf.Length = ACPI_ALLOCATE_BUFFER;
 1227 
 1228     /* Fetch and validate the CID */
 1229     if ((h = acpi_get_handle(dev)) == NULL)
 1230         goto out;
 1231     error = AcpiGetObjectInfo(h, &buf);
 1232     if (ACPI_FAILURE(error))
 1233         goto out;
 1234     devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;
 1235     if ((devinfo->Valid & ACPI_VALID_CID) == 0)
 1236         goto out;
 1237 
 1238     if (devinfo->CompatibilityId.Count < count)
 1239         count = devinfo->CompatibilityId.Count;
 1240     for (i = 0; i < count; i++) {
 1241         if (strncmp(devinfo->CompatibilityId.Id[i].Value, "PNP", 3) != 0)
 1242             continue;
 1243         *pnpid++ = PNP_EISAID(devinfo->CompatibilityId.Id[i].Value);
 1244         valid++;
 1245     }
 1246 
 1247 out:
 1248     if (buf.Pointer != NULL)
 1249         AcpiOsFree(buf.Pointer);
 1250     return_VALUE (valid);
 1251 }
 1252 
 1253 static char *
 1254 acpi_device_id_probe(device_t bus, device_t dev, char **ids) 
 1255 {
 1256     ACPI_HANDLE h;
 1257     int i;
 1258 
 1259     h = acpi_get_handle(dev);
 1260     if (ids == NULL || h == NULL || acpi_get_type(dev) != ACPI_TYPE_DEVICE)
 1261         return (NULL);
 1262 
 1263     /* Try to match one of the array of IDs with a HID or CID. */
 1264     for (i = 0; ids[i] != NULL; i++) {
 1265         if (acpi_MatchHid(h, ids[i]))
 1266             return (ids[i]);
 1267     }
 1268     return (NULL);
 1269 }
 1270 
 1271 static ACPI_STATUS
 1272 acpi_device_eval_obj(device_t bus, device_t dev, ACPI_STRING pathname,
 1273     ACPI_OBJECT_LIST *parameters, ACPI_BUFFER *ret)
 1274 {
 1275     ACPI_HANDLE h;
 1276 
 1277     if (dev == NULL)
 1278         h = ACPI_ROOT_OBJECT;
 1279     else if ((h = acpi_get_handle(dev)) == NULL)
 1280         return (AE_BAD_PARAMETER);
 1281     return (AcpiEvaluateObject(h, pathname, parameters, ret));
 1282 }
 1283 
 1284 static int
 1285 acpi_device_pwr_for_sleep(device_t bus, device_t dev, int *dstate)
 1286 {
 1287     struct acpi_softc *sc;
 1288     ACPI_HANDLE handle;
 1289     ACPI_STATUS status;
 1290     char sxd[8];
 1291     int error;
 1292 
 1293     sc = device_get_softc(bus);
 1294     handle = acpi_get_handle(dev);
 1295 
 1296     /*
 1297      * XXX If we find these devices, don't try to power them down.
 1298      * The serial and IRDA ports on my T23 hang the system when
 1299      * set to D3 and it appears that such legacy devices may
 1300      * need special handling in their drivers.
 1301      */
 1302     if (handle == NULL ||
 1303         acpi_MatchHid(handle, "PNP0500") ||
 1304         acpi_MatchHid(handle, "PNP0501") ||
 1305         acpi_MatchHid(handle, "PNP0502") ||
 1306         acpi_MatchHid(handle, "PNP0510") ||
 1307         acpi_MatchHid(handle, "PNP0511"))
 1308         return (ENXIO);
 1309 
 1310     /*
 1311      * Override next state with the value from _SxD, if present.  If no
 1312      * dstate argument was provided, don't fetch the return value.
 1313      */
 1314     snprintf(sxd, sizeof(sxd), "_S%dD", sc->acpi_sstate);
 1315     if (dstate)
 1316         status = acpi_GetInteger(handle, sxd, dstate);
 1317     else
 1318         status = AcpiEvaluateObject(handle, sxd, NULL, NULL);
 1319 
 1320     switch (status) {
 1321     case AE_OK:
 1322         error = 0;
 1323         break;
 1324     case AE_NOT_FOUND:
 1325         error = ESRCH;
 1326         break;
 1327     default:
 1328         error = ENXIO;
 1329         break;
 1330     }
 1331 
 1332     return (error);
 1333 }
 1334 
 1335 /* Callback arg for our implementation of walking the namespace. */
 1336 struct acpi_device_scan_ctx {
 1337     acpi_scan_cb_t      user_fn;
 1338     void                *arg;
 1339     ACPI_HANDLE         parent;
 1340 };
 1341 
 1342 static ACPI_STATUS
 1343 acpi_device_scan_cb(ACPI_HANDLE h, UINT32 level, void *arg, void **retval)
 1344 {
 1345     struct acpi_device_scan_ctx *ctx;
 1346     device_t dev, old_dev;
 1347     ACPI_STATUS status;
 1348     ACPI_OBJECT_TYPE type;
 1349 
 1350     /*
 1351      * Skip this device if we think we'll have trouble with it or it is
 1352      * the parent where the scan began.
 1353      */
 1354     ctx = (struct acpi_device_scan_ctx *)arg;
 1355     if (acpi_avoid(h) || h == ctx->parent)
 1356         return (AE_OK);
 1357 
 1358     /* If this is not a valid device type (e.g., a method), skip it. */
 1359     if (ACPI_FAILURE(AcpiGetType(h, &type)))
 1360         return (AE_OK);
 1361     if (type != ACPI_TYPE_DEVICE && type != ACPI_TYPE_PROCESSOR &&
 1362         type != ACPI_TYPE_THERMAL && type != ACPI_TYPE_POWER)
 1363         return (AE_OK);
 1364 
 1365     /*
 1366      * Call the user function with the current device.  If it is unchanged
 1367      * afterwards, return.  Otherwise, we update the handle to the new dev.
 1368      */
 1369     old_dev = acpi_get_device(h);
 1370     dev = old_dev;
 1371     status = ctx->user_fn(h, &dev, level, ctx->arg);
 1372     if (ACPI_FAILURE(status) || old_dev == dev)
 1373         return (status);
 1374 
 1375     /* Remove the old child and its connection to the handle. */
 1376     if (old_dev != NULL) {
 1377         device_delete_child(device_get_parent(old_dev), old_dev);
 1378         AcpiDetachData(h, acpi_fake_objhandler);
 1379     }
 1380 
 1381     /* Recreate the handle association if the user created a device. */
 1382     if (dev != NULL)
 1383         AcpiAttachData(h, acpi_fake_objhandler, dev);
 1384 
 1385     return (AE_OK);
 1386 }
 1387 
 1388 static ACPI_STATUS
 1389 acpi_device_scan_children(device_t bus, device_t dev, int max_depth,
 1390     acpi_scan_cb_t user_fn, void *arg)
 1391 {
 1392     ACPI_HANDLE h;
 1393     struct acpi_device_scan_ctx ctx;
 1394 
 1395     if (acpi_disabled("children"))
 1396         return (AE_OK);
 1397 
 1398     if (dev == NULL)
 1399         h = ACPI_ROOT_OBJECT;
 1400     else if ((h = acpi_get_handle(dev)) == NULL)
 1401         return (AE_BAD_PARAMETER);
 1402     ctx.user_fn = user_fn;
 1403     ctx.arg = arg;
 1404     ctx.parent = h;
 1405     return (AcpiWalkNamespace(ACPI_TYPE_ANY, h, max_depth,
 1406         acpi_device_scan_cb, &ctx, NULL));
 1407 }
 1408 
 1409 /*
 1410  * Even though ACPI devices are not PCI, we use the PCI approach for setting
 1411  * device power states since it's close enough to ACPI.
 1412  */
 1413 static int
 1414 acpi_set_powerstate_method(device_t bus, device_t child, int state)
 1415 {
 1416     ACPI_HANDLE h;
 1417     ACPI_STATUS status;
 1418     int error;
 1419 
 1420     error = 0;
 1421     h = acpi_get_handle(child);
 1422     if (state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
 1423         return (EINVAL);
 1424     if (h == NULL)
 1425         return (0);
 1426 
 1427     /* Ignore errors if the power methods aren't present. */
 1428     status = acpi_pwr_switch_consumer(h, state);
 1429     if (ACPI_FAILURE(status) && status != AE_NOT_FOUND
 1430         && status != AE_BAD_PARAMETER)
 1431         device_printf(bus, "failed to set ACPI power state D%d on %s: %s\n",
 1432             state, acpi_name(h), AcpiFormatException(status));
 1433 
 1434     return (error);
 1435 }
 1436 
 1437 static int
 1438 acpi_isa_pnp_probe(device_t bus, device_t child, struct isa_pnp_id *ids)
 1439 {
 1440     int                 result, cid_count, i;
 1441     uint32_t            lid, cids[8];
 1442 
 1443     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 1444 
 1445     /*
 1446      * ISA-style drivers attached to ACPI may persist and
 1447      * probe manually if we return ENOENT.  We never want
 1448      * that to happen, so don't ever return it.
 1449      */
 1450     result = ENXIO;
 1451 
 1452     /* Scan the supplied IDs for a match */
 1453     lid = acpi_isa_get_logicalid(child);
 1454     cid_count = acpi_isa_get_compatid(child, cids, 8);
 1455     while (ids && ids->ip_id) {
 1456         if (lid == ids->ip_id) {
 1457             result = 0;
 1458             goto out;
 1459         }
 1460         for (i = 0; i < cid_count; i++) {
 1461             if (cids[i] == ids->ip_id) {
 1462                 result = 0;
 1463                 goto out;
 1464             }
 1465         }
 1466         ids++;
 1467     }
 1468 
 1469  out:
 1470     if (result == 0 && ids->ip_desc)
 1471         device_set_desc(child, ids->ip_desc);
 1472 
 1473     return_VALUE (result);
 1474 }
 1475 
 1476 /*
 1477  * Scan all of the ACPI namespace and attach child devices.
 1478  *
 1479  * We should only expect to find devices in the \_PR, \_TZ, \_SI, and
 1480  * \_SB scopes, and \_PR and \_TZ became obsolete in the ACPI 2.0 spec.
 1481  * However, in violation of the spec, some systems place their PCI link
 1482  * devices in \, so we have to walk the whole namespace.  We check the
 1483  * type of namespace nodes, so this should be ok.
 1484  */
 1485 static void
 1486 acpi_probe_children(device_t bus)
 1487 {
 1488 
 1489     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 1490 
 1491     /*
 1492      * Scan the namespace and insert placeholders for all the devices that
 1493      * we find.  We also probe/attach any early devices.
 1494      *
 1495      * Note that we use AcpiWalkNamespace rather than AcpiGetDevices because
 1496      * we want to create nodes for all devices, not just those that are
 1497      * currently present. (This assumes that we don't want to create/remove
 1498      * devices as they appear, which might be smarter.)
 1499      */
 1500     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "namespace scan\n"));
 1501     AcpiWalkNamespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, 100, acpi_probe_child,
 1502         bus, NULL);
 1503 
 1504     /* Pre-allocate resources for our rman from any sysresource devices. */
 1505     acpi_sysres_alloc(bus);
 1506 
 1507     /* Create any static children by calling device identify methods. */
 1508     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "device identify routines\n"));
 1509     bus_generic_probe(bus);
 1510 
 1511     /* Probe/attach all children, created staticly and from the namespace. */
 1512     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "first bus_generic_attach\n"));
 1513     bus_generic_attach(bus);
 1514 
 1515     /*
 1516      * Some of these children may have attached others as part of their attach
 1517      * process (eg. the root PCI bus driver), so rescan.
 1518      */
 1519     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "second bus_generic_attach\n"));
 1520     bus_generic_attach(bus);
 1521 
 1522     /* Attach wake sysctls. */
 1523     acpi_wake_sysctl_walk(bus);
 1524 
 1525     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "done attaching children\n"));
 1526     return_VOID;
 1527 }
 1528 
 1529 /*
 1530  * Determine the probe order for a given device.
 1531  */
 1532 static void
 1533 acpi_probe_order(ACPI_HANDLE handle, int *order)
 1534 {
 1535     ACPI_OBJECT_TYPE type;
 1536 
 1537     /*
 1538      * 1. I/O port and memory system resource holders
 1539      * 2. Embedded controllers (to handle early accesses)
 1540      * 3. PCI Link Devices
 1541      * 100000. CPUs
 1542      */
 1543     AcpiGetType(handle, &type);
 1544     if (acpi_MatchHid(handle, "PNP0C01") || acpi_MatchHid(handle, "PNP0C02"))
 1545         *order = 1;
 1546     else if (acpi_MatchHid(handle, "PNP0C09"))
 1547         *order = 2;
 1548     else if (acpi_MatchHid(handle, "PNP0C0F"))
 1549         *order = 3;
 1550     else if (type == ACPI_TYPE_PROCESSOR)
 1551         *order = 100000;
 1552 }
 1553 
 1554 /*
 1555  * Evaluate a child device and determine whether we might attach a device to
 1556  * it.
 1557  */
 1558 static ACPI_STATUS
 1559 acpi_probe_child(ACPI_HANDLE handle, UINT32 level, void *context, void **status)
 1560 {
 1561     ACPI_OBJECT_TYPE type;
 1562     ACPI_HANDLE h;
 1563     device_t bus, child;
 1564     int order;
 1565     char *handle_str, **search;
 1566     static char *scopes[] = {"\\_PR_", "\\_TZ_", "\\_SI_", "\\_SB_", NULL};
 1567 
 1568     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 1569 
 1570     /* Skip this device if we think we'll have trouble with it. */
 1571     if (acpi_avoid(handle))
 1572         return_ACPI_STATUS (AE_OK);
 1573 
 1574     bus = (device_t)context;
 1575     if (ACPI_SUCCESS(AcpiGetType(handle, &type))) {
 1576         switch (type) {
 1577         case ACPI_TYPE_DEVICE:
 1578         case ACPI_TYPE_PROCESSOR:
 1579         case ACPI_TYPE_THERMAL:
 1580         case ACPI_TYPE_POWER:
 1581             if (acpi_disabled("children"))
 1582                 break;
 1583 
 1584             /*
 1585              * Since we scan from \, be sure to skip system scope objects.
 1586              * At least \_SB and \_TZ are detected as devices (ACPI-CA bug?)
 1587              */
 1588             handle_str = acpi_name(handle);
 1589             for (search = scopes; *search != NULL; search++) {
 1590                 if (strcmp(handle_str, *search) == 0)
 1591                     break;
 1592             }
 1593             if (*search != NULL)
 1594                 break;
 1595 
 1596             /* 
 1597              * Create a placeholder device for this node.  Sort the
 1598              * placeholder so that the probe/attach passes will run
 1599              * breadth-first.  Orders less than ACPI_DEV_BASE_ORDER
 1600              * are reserved for special objects (i.e., system
 1601              * resources).  CPU devices have a very high order to
 1602              * ensure they are probed after other devices.
 1603              */
 1604             ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "scanning '%s'\n", handle_str));
 1605             order = level * 10 + 100;
 1606             acpi_probe_order(handle, &order);
 1607             child = BUS_ADD_CHILD(bus, order, NULL, -1);
 1608             if (child == NULL)
 1609                 break;
 1610 
 1611             /* Associate the handle with the device_t and vice versa. */
 1612             acpi_set_handle(child, handle);
 1613             AcpiAttachData(handle, acpi_fake_objhandler, child);
 1614 
 1615             /*
 1616              * Check that the device is present.  If it's not present,
 1617              * leave it disabled (so that we have a device_t attached to
 1618              * the handle, but we don't probe it).
 1619              *
 1620              * XXX PCI link devices sometimes report "present" but not
 1621              * "functional" (i.e. if disabled).  Go ahead and probe them
 1622              * anyway since we may enable them later.
 1623              */
 1624             if (type == ACPI_TYPE_DEVICE && !acpi_DeviceIsPresent(child)) {
 1625                 /* Never disable PCI link devices. */
 1626                 if (acpi_MatchHid(handle, "PNP0C0F"))
 1627                     break;
 1628                 /*
 1629                  * Docking stations should remain enabled since the system
 1630                  * may be undocked at boot.
 1631                  */
 1632                 if (ACPI_SUCCESS(AcpiGetHandle(handle, "_DCK", &h)))
 1633                     break;
 1634 
 1635                 device_disable(child);
 1636                 break;
 1637             }
 1638 
 1639             /*
 1640              * Get the device's resource settings and attach them.
 1641              * Note that if the device has _PRS but no _CRS, we need
 1642              * to decide when it's appropriate to try to configure the
 1643              * device.  Ignore the return value here; it's OK for the
 1644              * device not to have any resources.
 1645              */
 1646             acpi_parse_resources(child, handle, &acpi_res_parse_set, NULL);
 1647             break;
 1648         }
 1649     }
 1650 
 1651     return_ACPI_STATUS (AE_OK);
 1652 }
 1653 
 1654 /*
 1655  * AcpiAttachData() requires an object handler but never uses it.  This is a
 1656  * placeholder object handler so we can store a device_t in an ACPI_HANDLE.
 1657  */
 1658 void
 1659 acpi_fake_objhandler(ACPI_HANDLE h, UINT32 fn, void *data)
 1660 {
 1661 }
 1662 
 1663 static void
 1664 acpi_shutdown_final(void *arg, int howto)
 1665 {
 1666     struct acpi_softc *sc;
 1667     ACPI_STATUS status;
 1668 
 1669     /*
 1670      * XXX Shutdown code should only run on the BSP (cpuid 0).
 1671      * Some chipsets do not power off the system correctly if called from
 1672      * an AP.
 1673      */
 1674     sc = arg;
 1675     if ((howto & RB_POWEROFF) != 0) {
 1676         status = AcpiEnterSleepStatePrep(ACPI_STATE_S5);
 1677         if (ACPI_FAILURE(status)) {
 1678             printf("AcpiEnterSleepStatePrep failed - %s\n",
 1679                    AcpiFormatException(status));
 1680             return;
 1681         }
 1682         printf("Powering system off using ACPI\n");
 1683         ACPI_DISABLE_IRQS();
 1684         status = AcpiEnterSleepState(ACPI_STATE_S5);
 1685         if (ACPI_FAILURE(status)) {
 1686             printf("ACPI power-off failed - %s\n", AcpiFormatException(status));
 1687         } else {
 1688             DELAY(1000000);
 1689             printf("ACPI power-off failed - timeout\n");
 1690         }
 1691     } else if ((howto & RB_HALT) == 0 &&
 1692         (AcpiGbl_FADT.Flags & ACPI_FADT_RESET_REGISTER) &&
 1693         sc->acpi_handle_reboot) {
 1694         /* Reboot using the reset register. */
 1695         status = AcpiHwLowLevelWrite(
 1696             AcpiGbl_FADT.ResetRegister.BitWidth,
 1697             AcpiGbl_FADT.ResetValue, &AcpiGbl_FADT.ResetRegister);
 1698         if (ACPI_FAILURE(status)) {
 1699             printf("ACPI reset failed - %s\n", AcpiFormatException(status));
 1700         } else {
 1701             DELAY(1000000);
 1702             printf("ACPI reset failed - timeout\n");
 1703         }
 1704     } else if (sc->acpi_do_disable && panicstr == NULL) {
 1705         /*
 1706          * Only disable ACPI if the user requested.  On some systems, writing
 1707          * the disable value to SMI_CMD hangs the system.
 1708          */
 1709         printf("Shutting down ACPI\n");
 1710         AcpiTerminate();
 1711     }
 1712 }
 1713 
 1714 static void
 1715 acpi_enable_fixed_events(struct acpi_softc *sc)
 1716 {
 1717     static int  first_time = 1;
 1718 
 1719     /* Enable and clear fixed events and install handlers. */
 1720     if ((AcpiGbl_FADT.Flags & ACPI_FADT_POWER_BUTTON) == 0) {
 1721         AcpiClearEvent(ACPI_EVENT_POWER_BUTTON);
 1722         AcpiInstallFixedEventHandler(ACPI_EVENT_POWER_BUTTON,
 1723                                      acpi_event_power_button_sleep, sc);
 1724         if (first_time)
 1725             device_printf(sc->acpi_dev, "Power Button (fixed)\n");
 1726     }
 1727     if ((AcpiGbl_FADT.Flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
 1728         AcpiClearEvent(ACPI_EVENT_SLEEP_BUTTON);
 1729         AcpiInstallFixedEventHandler(ACPI_EVENT_SLEEP_BUTTON,
 1730                                      acpi_event_sleep_button_sleep, sc);
 1731         if (first_time)
 1732             device_printf(sc->acpi_dev, "Sleep Button (fixed)\n");
 1733     }
 1734 
 1735     first_time = 0;
 1736 }
 1737 
 1738 /*
 1739  * Returns true if the device is actually present and should
 1740  * be attached to.  This requires the present, enabled, UI-visible 
 1741  * and diagnostics-passed bits to be set.
 1742  */
 1743 BOOLEAN
 1744 acpi_DeviceIsPresent(device_t dev)
 1745 {
 1746     ACPI_DEVICE_INFO    *devinfo;
 1747     ACPI_HANDLE         h;
 1748     ACPI_BUFFER         buf;
 1749     ACPI_STATUS         error;
 1750     int                 ret;
 1751 
 1752     ret = FALSE;
 1753     if ((h = acpi_get_handle(dev)) == NULL)
 1754         return (FALSE);
 1755     buf.Pointer = NULL;
 1756     buf.Length = ACPI_ALLOCATE_BUFFER;
 1757     error = AcpiGetObjectInfo(h, &buf);
 1758     if (ACPI_FAILURE(error))
 1759         return (FALSE);
 1760     devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;
 1761 
 1762     /* If no _STA method, must be present */
 1763     if ((devinfo->Valid & ACPI_VALID_STA) == 0)
 1764         ret = TRUE;
 1765 
 1766     /* Return true for 'present' and 'functioning' */
 1767     if (ACPI_DEVICE_PRESENT(devinfo->CurrentStatus))
 1768         ret = TRUE;
 1769 
 1770     AcpiOsFree(buf.Pointer);
 1771     return (ret);
 1772 }
 1773 
 1774 /*
 1775  * Returns true if the battery is actually present and inserted.
 1776  */
 1777 BOOLEAN
 1778 acpi_BatteryIsPresent(device_t dev)
 1779 {
 1780     ACPI_DEVICE_INFO    *devinfo;
 1781     ACPI_HANDLE         h;
 1782     ACPI_BUFFER         buf;
 1783     ACPI_STATUS         error;
 1784     int                 ret;
 1785 
 1786     ret = FALSE;
 1787     if ((h = acpi_get_handle(dev)) == NULL)
 1788         return (FALSE);
 1789     buf.Pointer = NULL;
 1790     buf.Length = ACPI_ALLOCATE_BUFFER;
 1791     error = AcpiGetObjectInfo(h, &buf);
 1792     if (ACPI_FAILURE(error))
 1793         return (FALSE);
 1794     devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;
 1795 
 1796     /* If no _STA method, must be present */
 1797     if ((devinfo->Valid & ACPI_VALID_STA) == 0)
 1798         ret = TRUE;
 1799 
 1800     /* Return true for 'present', 'battery present', and 'functioning' */
 1801     if (ACPI_BATTERY_PRESENT(devinfo->CurrentStatus))
 1802         ret = TRUE;
 1803 
 1804     AcpiOsFree(buf.Pointer);
 1805     return (ret);
 1806 }
 1807 
 1808 /*
 1809  * Match a HID string against a handle
 1810  */
 1811 static BOOLEAN
 1812 acpi_MatchHid(ACPI_HANDLE h, const char *hid) 
 1813 {
 1814     ACPI_DEVICE_INFO    *devinfo;
 1815     ACPI_BUFFER         buf;
 1816     ACPI_STATUS         error;
 1817     int                 ret, i;
 1818 
 1819     ret = FALSE;
 1820     if (hid == NULL || h == NULL)
 1821         return (ret);
 1822     buf.Pointer = NULL;
 1823     buf.Length = ACPI_ALLOCATE_BUFFER;
 1824     error = AcpiGetObjectInfo(h, &buf);
 1825     if (ACPI_FAILURE(error))
 1826         return (ret);
 1827     devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;
 1828 
 1829     if ((devinfo->Valid & ACPI_VALID_HID) != 0 &&
 1830         strcmp(hid, devinfo->HardwareId.Value) == 0)
 1831             ret = TRUE;
 1832     else if ((devinfo->Valid & ACPI_VALID_CID) != 0) {
 1833         for (i = 0; i < devinfo->CompatibilityId.Count; i++) {
 1834             if (strcmp(hid, devinfo->CompatibilityId.Id[i].Value) == 0) {
 1835                 ret = TRUE;
 1836                 break;
 1837             }
 1838         }
 1839     }
 1840 
 1841     AcpiOsFree(buf.Pointer);
 1842     return (ret);
 1843 }
 1844 
 1845 /*
 1846  * Return the handle of a named object within our scope, ie. that of (parent)
 1847  * or one if its parents.
 1848  */
 1849 ACPI_STATUS
 1850 acpi_GetHandleInScope(ACPI_HANDLE parent, char *path, ACPI_HANDLE *result)
 1851 {
 1852     ACPI_HANDLE         r;
 1853     ACPI_STATUS         status;
 1854 
 1855     /* Walk back up the tree to the root */
 1856     for (;;) {
 1857         status = AcpiGetHandle(parent, path, &r);
 1858         if (ACPI_SUCCESS(status)) {
 1859             *result = r;
 1860             return (AE_OK);
 1861         }
 1862         /* XXX Return error here? */
 1863         if (status != AE_NOT_FOUND)
 1864             return (AE_OK);
 1865         if (ACPI_FAILURE(AcpiGetParent(parent, &r)))
 1866             return (AE_NOT_FOUND);
 1867         parent = r;
 1868     }
 1869 }
 1870 
 1871 /* Find the difference between two PM tick counts. */
 1872 uint32_t
 1873 acpi_TimerDelta(uint32_t end, uint32_t start)
 1874 {
 1875     uint32_t delta;
 1876 
 1877     if (end >= start)
 1878         delta = end - start;
 1879     else if (AcpiGbl_FADT.Flags & ACPI_FADT_32BIT_TIMER)
 1880         delta = ((0xFFFFFFFF - start) + end + 1);
 1881     else
 1882         delta = ((0x00FFFFFF - start) + end + 1) & 0x00FFFFFF;
 1883     return (delta);
 1884 }
 1885 
 1886 /*
 1887  * Allocate a buffer with a preset data size.
 1888  */
 1889 ACPI_BUFFER *
 1890 acpi_AllocBuffer(int size)
 1891 {
 1892     ACPI_BUFFER *buf;
 1893 
 1894     if ((buf = malloc(size + sizeof(*buf), M_ACPIDEV, M_NOWAIT)) == NULL)
 1895         return (NULL);
 1896     buf->Length = size;
 1897     buf->Pointer = (void *)(buf + 1);
 1898     return (buf);
 1899 }
 1900 
 1901 ACPI_STATUS
 1902 acpi_SetInteger(ACPI_HANDLE handle, char *path, UINT32 number)
 1903 {
 1904     ACPI_OBJECT arg1;
 1905     ACPI_OBJECT_LIST args;
 1906 
 1907     arg1.Type = ACPI_TYPE_INTEGER;
 1908     arg1.Integer.Value = number;
 1909     args.Count = 1;
 1910     args.Pointer = &arg1;
 1911 
 1912     return (AcpiEvaluateObject(handle, path, &args, NULL));
 1913 }
 1914 
 1915 /*
 1916  * Evaluate a path that should return an integer.
 1917  */
 1918 ACPI_STATUS
 1919 acpi_GetInteger(ACPI_HANDLE handle, char *path, UINT32 *number)
 1920 {
 1921     ACPI_STATUS status;
 1922     ACPI_BUFFER buf;
 1923     ACPI_OBJECT param;
 1924 
 1925     if (handle == NULL)
 1926         handle = ACPI_ROOT_OBJECT;
 1927 
 1928     /*
 1929      * Assume that what we've been pointed at is an Integer object, or
 1930      * a method that will return an Integer.
 1931      */
 1932     buf.Pointer = &param;
 1933     buf.Length = sizeof(param);
 1934     status = AcpiEvaluateObject(handle, path, NULL, &buf);
 1935     if (ACPI_SUCCESS(status)) {
 1936         if (param.Type == ACPI_TYPE_INTEGER)
 1937             *number = param.Integer.Value;
 1938         else
 1939             status = AE_TYPE;
 1940     }
 1941 
 1942     /* 
 1943      * In some applications, a method that's expected to return an Integer
 1944      * may instead return a Buffer (probably to simplify some internal
 1945      * arithmetic).  We'll try to fetch whatever it is, and if it's a Buffer,
 1946      * convert it into an Integer as best we can.
 1947      *
 1948      * This is a hack.
 1949      */
 1950     if (status == AE_BUFFER_OVERFLOW) {
 1951         if ((buf.Pointer = AcpiOsAllocate(buf.Length)) == NULL) {
 1952             status = AE_NO_MEMORY;
 1953         } else {
 1954             status = AcpiEvaluateObject(handle, path, NULL, &buf);
 1955             if (ACPI_SUCCESS(status))
 1956                 status = acpi_ConvertBufferToInteger(&buf, number);
 1957             AcpiOsFree(buf.Pointer);
 1958         }
 1959     }
 1960     return (status);
 1961 }
 1962 
 1963 ACPI_STATUS
 1964 acpi_ConvertBufferToInteger(ACPI_BUFFER *bufp, UINT32 *number)
 1965 {
 1966     ACPI_OBJECT *p;
 1967     UINT8       *val;
 1968     int         i;
 1969 
 1970     p = (ACPI_OBJECT *)bufp->Pointer;
 1971     if (p->Type == ACPI_TYPE_INTEGER) {
 1972         *number = p->Integer.Value;
 1973         return (AE_OK);
 1974     }
 1975     if (p->Type != ACPI_TYPE_BUFFER)
 1976         return (AE_TYPE);
 1977     if (p->Buffer.Length > sizeof(int))
 1978         return (AE_BAD_DATA);
 1979 
 1980     *number = 0;
 1981     val = p->Buffer.Pointer;
 1982     for (i = 0; i < p->Buffer.Length; i++)
 1983         *number += val[i] << (i * 8);
 1984     return (AE_OK);
 1985 }
 1986 
 1987 /*
 1988  * Iterate over the elements of an a package object, calling the supplied
 1989  * function for each element.
 1990  *
 1991  * XXX possible enhancement might be to abort traversal on error.
 1992  */
 1993 ACPI_STATUS
 1994 acpi_ForeachPackageObject(ACPI_OBJECT *pkg,
 1995         void (*func)(ACPI_OBJECT *comp, void *arg), void *arg)
 1996 {
 1997     ACPI_OBJECT *comp;
 1998     int         i;
 1999 
 2000     if (pkg == NULL || pkg->Type != ACPI_TYPE_PACKAGE)
 2001         return (AE_BAD_PARAMETER);
 2002 
 2003     /* Iterate over components */
 2004     i = 0;
 2005     comp = pkg->Package.Elements;
 2006     for (; i < pkg->Package.Count; i++, comp++)
 2007         func(comp, arg);
 2008 
 2009     return (AE_OK);
 2010 }
 2011 
 2012 /*
 2013  * Find the (index)th resource object in a set.
 2014  */
 2015 ACPI_STATUS
 2016 acpi_FindIndexedResource(ACPI_BUFFER *buf, int index, ACPI_RESOURCE **resp)
 2017 {
 2018     ACPI_RESOURCE       *rp;
 2019     int                 i;
 2020 
 2021     rp = (ACPI_RESOURCE *)buf->Pointer;
 2022     i = index;
 2023     while (i-- > 0) {
 2024         /* Range check */
 2025         if (rp > (ACPI_RESOURCE *)((u_int8_t *)buf->Pointer + buf->Length))
 2026             return (AE_BAD_PARAMETER);
 2027 
 2028         /* Check for terminator */
 2029         if (rp->Type == ACPI_RESOURCE_TYPE_END_TAG || rp->Length == 0)
 2030             return (AE_NOT_FOUND);
 2031         rp = ACPI_NEXT_RESOURCE(rp);
 2032     }
 2033     if (resp != NULL)
 2034         *resp = rp;
 2035 
 2036     return (AE_OK);
 2037 }
 2038 
 2039 /*
 2040  * Append an ACPI_RESOURCE to an ACPI_BUFFER.
 2041  *
 2042  * Given a pointer to an ACPI_RESOURCE structure, expand the ACPI_BUFFER
 2043  * provided to contain it.  If the ACPI_BUFFER is empty, allocate a sensible
 2044  * backing block.  If the ACPI_RESOURCE is NULL, return an empty set of
 2045  * resources.
 2046  */
 2047 #define ACPI_INITIAL_RESOURCE_BUFFER_SIZE       512
 2048 
 2049 ACPI_STATUS
 2050 acpi_AppendBufferResource(ACPI_BUFFER *buf, ACPI_RESOURCE *res)
 2051 {
 2052     ACPI_RESOURCE       *rp;
 2053     void                *newp;
 2054 
 2055     /* Initialise the buffer if necessary. */
 2056     if (buf->Pointer == NULL) {
 2057         buf->Length = ACPI_INITIAL_RESOURCE_BUFFER_SIZE;
 2058         if ((buf->Pointer = AcpiOsAllocate(buf->Length)) == NULL)
 2059             return (AE_NO_MEMORY);
 2060         rp = (ACPI_RESOURCE *)buf->Pointer;
 2061         rp->Type = ACPI_RESOURCE_TYPE_END_TAG;
 2062         rp->Length = 0;
 2063     }
 2064     if (res == NULL)
 2065         return (AE_OK);
 2066 
 2067     /*
 2068      * Scan the current buffer looking for the terminator.
 2069      * This will either find the terminator or hit the end
 2070      * of the buffer and return an error.
 2071      */
 2072     rp = (ACPI_RESOURCE *)buf->Pointer;
 2073     for (;;) {
 2074         /* Range check, don't go outside the buffer */
 2075         if (rp >= (ACPI_RESOURCE *)((u_int8_t *)buf->Pointer + buf->Length))
 2076             return (AE_BAD_PARAMETER);
 2077         if (rp->Type == ACPI_RESOURCE_TYPE_END_TAG || rp->Length == 0)
 2078             break;
 2079         rp = ACPI_NEXT_RESOURCE(rp);
 2080     }
 2081 
 2082     /*
 2083      * Check the size of the buffer and expand if required.
 2084      *
 2085      * Required size is:
 2086      *  size of existing resources before terminator + 
 2087      *  size of new resource and header +
 2088      *  size of terminator.
 2089      *
 2090      * Note that this loop should really only run once, unless
 2091      * for some reason we are stuffing a *really* huge resource.
 2092      */
 2093     while ((((u_int8_t *)rp - (u_int8_t *)buf->Pointer) + 
 2094             res->Length + ACPI_RS_SIZE_NO_DATA +
 2095             ACPI_RS_SIZE_MIN) >= buf->Length) {
 2096         if ((newp = AcpiOsAllocate(buf->Length * 2)) == NULL)
 2097             return (AE_NO_MEMORY);
 2098         bcopy(buf->Pointer, newp, buf->Length);
 2099         rp = (ACPI_RESOURCE *)((u_int8_t *)newp +
 2100                                ((u_int8_t *)rp - (u_int8_t *)buf->Pointer));
 2101         AcpiOsFree(buf->Pointer);
 2102         buf->Pointer = newp;
 2103         buf->Length += buf->Length;
 2104     }
 2105 
 2106     /* Insert the new resource. */
 2107     bcopy(res, rp, res->Length + ACPI_RS_SIZE_NO_DATA);
 2108 
 2109     /* And add the terminator. */
 2110     rp = ACPI_NEXT_RESOURCE(rp);
 2111     rp->Type = ACPI_RESOURCE_TYPE_END_TAG;
 2112     rp->Length = 0;
 2113 
 2114     return (AE_OK);
 2115 }
 2116 
 2117 /*
 2118  * Set interrupt model.
 2119  */
 2120 ACPI_STATUS
 2121 acpi_SetIntrModel(int model)
 2122 {
 2123 
 2124     return (acpi_SetInteger(ACPI_ROOT_OBJECT, "_PIC", model));
 2125 }
 2126 
 2127 /*
 2128  * DEPRECATED.  This interface has serious deficiencies and will be
 2129  * removed.
 2130  *
 2131  * Immediately enter the sleep state.  In the old model, acpiconf(8) ran
 2132  * rc.suspend and rc.resume so we don't have to notify devd(8) to do this.
 2133  */
 2134 ACPI_STATUS
 2135 acpi_SetSleepState(struct acpi_softc *sc, int state)
 2136 {
 2137     static int once;
 2138 
 2139     if (!once) {
 2140         printf(
 2141 "warning: acpi_SetSleepState() deprecated, need to update your software\n");
 2142         once = 1;
 2143     }
 2144     return (acpi_EnterSleepState(sc, state));
 2145 }
 2146 
 2147 static void
 2148 acpi_sleep_force(void *arg)
 2149 {
 2150     struct acpi_softc *sc;
 2151 
 2152     printf("acpi: suspend request timed out, forcing sleep now\n");
 2153     sc = arg;
 2154     if (ACPI_FAILURE(acpi_EnterSleepState(sc, sc->acpi_next_sstate)))
 2155         printf("acpi: force sleep state S%d failed\n", sc->acpi_next_sstate);
 2156 }
 2157 
 2158 /*
 2159  * Request that the system enter the given suspend state.  All /dev/apm
 2160  * devices and devd(8) will be notified.  Userland then has a chance to
 2161  * save state and acknowledge the request.  The system sleeps once all
 2162  * acks are in.
 2163  */
 2164 int
 2165 acpi_ReqSleepState(struct acpi_softc *sc, int state)
 2166 {
 2167     struct apm_clone_data *clone;
 2168 
 2169     if (state < ACPI_STATE_S1 || state > ACPI_STATE_S5)
 2170         return (EINVAL);
 2171 
 2172     /* S5 (soft-off) should be entered directly with no waiting. */
 2173     if (state == ACPI_STATE_S5) {
 2174         if (ACPI_SUCCESS(acpi_EnterSleepState(sc, state)))
 2175             return (0);
 2176         else
 2177             return (ENXIO);
 2178     }
 2179 
 2180 #if !defined(__i386__)
 2181     /* This platform does not support acpi suspend/resume. */
 2182     return (EOPNOTSUPP);
 2183 #endif
 2184 
 2185     /* If a suspend request is already in progress, just return. */
 2186     ACPI_LOCK(acpi);
 2187     if (sc->acpi_next_sstate != 0) {
 2188         ACPI_UNLOCK(acpi);
 2189         return (0);
 2190     }
 2191 
 2192     /* Record the pending state and notify all apm devices. */
 2193     sc->acpi_next_sstate = state;
 2194     STAILQ_FOREACH(clone, &sc->apm_cdevs, entries) {
 2195         clone->notify_status = APM_EV_NONE;
 2196         if ((clone->flags & ACPI_EVF_DEVD) == 0) {
 2197             selwakeuppri(&clone->sel_read, PZERO);
 2198             KNOTE_UNLOCKED(&clone->sel_read.si_note, 0);
 2199         }
 2200     }
 2201 
 2202     /* If devd(8) is not running, immediately enter the sleep state. */
 2203     if (devctl_process_running() == FALSE) {
 2204         ACPI_UNLOCK(acpi);
 2205         if (ACPI_SUCCESS(acpi_EnterSleepState(sc, sc->acpi_next_sstate))) {
 2206             return (0);
 2207         } else {
 2208             return (ENXIO);
 2209         }
 2210     }
 2211 
 2212     /* Now notify devd(8) also. */
 2213     acpi_UserNotify("Suspend", ACPI_ROOT_OBJECT, state);
 2214 
 2215     /*
 2216      * Set a timeout to fire if userland doesn't ack the suspend request
 2217      * in time.  This way we still eventually go to sleep if we were
 2218      * overheating or running low on battery, even if userland is hung.
 2219      * We cancel this timeout once all userland acks are in or the
 2220      * suspend request is aborted.
 2221      */
 2222     callout_reset(&sc->susp_force_to, 10 * hz, acpi_sleep_force, sc);
 2223     ACPI_UNLOCK(acpi);
 2224     return (0);
 2225 }
 2226 
 2227 /*
 2228  * Acknowledge (or reject) a pending sleep state.  The caller has
 2229  * prepared for suspend and is now ready for it to proceed.  If the
 2230  * error argument is non-zero, it indicates suspend should be cancelled
 2231  * and gives an errno value describing why.  Once all votes are in,
 2232  * we suspend the system.
 2233  */
 2234 int
 2235 acpi_AckSleepState(struct apm_clone_data *clone, int error)
 2236 {
 2237     struct acpi_softc *sc;
 2238     int ret, sleeping;
 2239 
 2240 #if !defined(__i386__)
 2241     /* This platform does not support acpi suspend/resume. */
 2242     return (EOPNOTSUPP);
 2243 #endif
 2244 
 2245     /* If no pending sleep state, return an error. */
 2246     ACPI_LOCK(acpi);
 2247     sc = clone->acpi_sc;
 2248     if (sc->acpi_next_sstate == 0) {
 2249         ACPI_UNLOCK(acpi);
 2250         return (ENXIO);
 2251     }
 2252 
 2253     /* Caller wants to abort suspend process. */
 2254     if (error) {
 2255         sc->acpi_next_sstate = 0;
 2256         callout_stop(&sc->susp_force_to);
 2257         printf("acpi: listener on %s cancelled the pending suspend\n",
 2258             devtoname(clone->cdev));
 2259         ACPI_UNLOCK(acpi);
 2260         return (0);
 2261     }
 2262 
 2263     /*
 2264      * Mark this device as acking the suspend request.  Then, walk through
 2265      * all devices, seeing if they agree yet.  We only count devices that
 2266      * are writable since read-only devices couldn't ack the request.
 2267      */
 2268     clone->notify_status = APM_EV_ACKED;
 2269     sleeping = TRUE;
 2270     STAILQ_FOREACH(clone, &sc->apm_cdevs, entries) {
 2271         if ((clone->flags & ACPI_EVF_WRITE) != 0 &&
 2272             clone->notify_status != APM_EV_ACKED) {
 2273             sleeping = FALSE;
 2274             break;
 2275         }
 2276     }
 2277 
 2278     /* If all devices have voted "yes", we will suspend now. */
 2279     if (sleeping)
 2280         callout_stop(&sc->susp_force_to);
 2281     ACPI_UNLOCK(acpi);
 2282     ret = 0;
 2283     if (sleeping) {
 2284         if (ACPI_FAILURE(acpi_EnterSleepState(sc, sc->acpi_next_sstate)))
 2285                 ret = ENODEV;
 2286     }
 2287 
 2288     return (ret);
 2289 }
 2290 
 2291 static void
 2292 acpi_sleep_enable(void *arg)
 2293 {
 2294 
 2295     ((struct acpi_softc *)arg)->acpi_sleep_disabled = 0;
 2296 }
 2297 
 2298 enum acpi_sleep_state {
 2299     ACPI_SS_NONE,
 2300     ACPI_SS_GPE_SET,
 2301     ACPI_SS_DEV_SUSPEND,
 2302     ACPI_SS_SLP_PREP,
 2303     ACPI_SS_SLEPT,
 2304 };
 2305 
 2306 /*
 2307  * Enter the desired system sleep state.
 2308  *
 2309  * Currently we support S1-S5 but S4 is only S4BIOS
 2310  */
 2311 static ACPI_STATUS
 2312 acpi_EnterSleepState(struct acpi_softc *sc, int state)
 2313 {
 2314     ACPI_STATUS status;
 2315     UINT8       TypeA;
 2316     UINT8       TypeB;
 2317     enum acpi_sleep_state slp_state;
 2318 
 2319     ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, state);
 2320 
 2321     /* Re-entry once we're suspending is not allowed. */
 2322     status = AE_OK;
 2323     ACPI_LOCK(acpi);
 2324     if (sc->acpi_sleep_disabled) {
 2325         ACPI_UNLOCK(acpi);
 2326         printf("acpi: suspend request ignored (not ready yet)\n");
 2327         return (AE_ERROR);
 2328     }
 2329     sc->acpi_sleep_disabled = 1;
 2330     ACPI_UNLOCK(acpi);
 2331 
 2332     /*
 2333      * Be sure to hold Giant across DEVICE_SUSPEND/RESUME since non-MPSAFE
 2334      * drivers need this.
 2335      */
 2336     mtx_lock(&Giant);
 2337     slp_state = ACPI_SS_NONE;
 2338     switch (state) {
 2339     case ACPI_STATE_S1:
 2340     case ACPI_STATE_S2:
 2341     case ACPI_STATE_S3:
 2342     case ACPI_STATE_S4:
 2343         status = AcpiGetSleepTypeData(state, &TypeA, &TypeB);
 2344         if (status == AE_NOT_FOUND) {
 2345             device_printf(sc->acpi_dev,
 2346                           "Sleep state S%d not supported by BIOS\n", state);
 2347             break;
 2348         } else if (ACPI_FAILURE(status)) {
 2349             device_printf(sc->acpi_dev, "AcpiGetSleepTypeData failed - %s\n",
 2350                           AcpiFormatException(status));
 2351             break;
 2352         }
 2353 
 2354         sc->acpi_sstate = state;
 2355 
 2356         /* Enable any GPEs as appropriate and requested by the user. */
 2357         acpi_wake_prep_walk(state);
 2358         slp_state = ACPI_SS_GPE_SET;
 2359 
 2360         /*
 2361          * Inform all devices that we are going to sleep.  If at least one
 2362          * device fails, DEVICE_SUSPEND() automatically resumes the tree.
 2363          *
 2364          * XXX Note that a better two-pass approach with a 'veto' pass
 2365          * followed by a "real thing" pass would be better, but the current
 2366          * bus interface does not provide for this.
 2367          */
 2368         if (DEVICE_SUSPEND(root_bus) != 0) {
 2369             device_printf(sc->acpi_dev, "device_suspend failed\n");
 2370             break;
 2371         }
 2372         slp_state = ACPI_SS_DEV_SUSPEND;
 2373 
 2374         /* If testing device suspend only, back out of everything here. */
 2375         if (acpi_susp_bounce)
 2376             break;
 2377 
 2378         status = AcpiEnterSleepStatePrep(state);
 2379         if (ACPI_FAILURE(status)) {
 2380             device_printf(sc->acpi_dev, "AcpiEnterSleepStatePrep failed - %s\n",
 2381                           AcpiFormatException(status));
 2382             break;
 2383         }
 2384         slp_state = ACPI_SS_SLP_PREP;
 2385 
 2386         if (sc->acpi_sleep_delay > 0)
 2387             DELAY(sc->acpi_sleep_delay * 1000000);
 2388 
 2389         if (state != ACPI_STATE_S1) {
 2390             acpi_sleep_machdep(sc, state);
 2391 
 2392             /* Re-enable ACPI hardware on wakeup from sleep state 4. */
 2393             if (state == ACPI_STATE_S4)
 2394                 AcpiEnable();
 2395         } else {
 2396             ACPI_DISABLE_IRQS();
 2397             status = AcpiEnterSleepState(state);
 2398             if (ACPI_FAILURE(status)) {
 2399                 device_printf(sc->acpi_dev, "AcpiEnterSleepState failed - %s\n",
 2400                               AcpiFormatException(status));
 2401                 break;
 2402             }
 2403         }
 2404         slp_state = ACPI_SS_SLEPT;
 2405         break;
 2406     case ACPI_STATE_S5:
 2407         /*
 2408          * Shut down cleanly and power off.  This will call us back through the
 2409          * shutdown handlers.
 2410          */
 2411         shutdown_nice(RB_POWEROFF);
 2412         break;
 2413     case ACPI_STATE_S0:
 2414     default:
 2415         status = AE_BAD_PARAMETER;
 2416         break;
 2417     }
 2418 
 2419     /*
 2420      * Back out state according to how far along we got in the suspend
 2421      * process.  This handles both the error and success cases.
 2422      */
 2423     sc->acpi_next_sstate = 0;
 2424     if (slp_state >= ACPI_SS_GPE_SET) {
 2425         acpi_wake_prep_walk(state);
 2426         sc->acpi_sstate = ACPI_STATE_S0;
 2427     }
 2428     if (slp_state >= ACPI_SS_SLP_PREP)
 2429         AcpiLeaveSleepState(state);
 2430     if (slp_state >= ACPI_SS_DEV_SUSPEND)
 2431         DEVICE_RESUME(root_bus);
 2432     if (slp_state >= ACPI_SS_SLEPT)
 2433         acpi_enable_fixed_events(sc);
 2434 
 2435     /* Allow another sleep request after a while. */
 2436     if (state != ACPI_STATE_S5)
 2437         timeout(acpi_sleep_enable, sc, hz * ACPI_MINIMUM_AWAKETIME);
 2438 
 2439     /* Run /etc/rc.resume after we are back. */
 2440     acpi_UserNotify("Resume", ACPI_ROOT_OBJECT, state);
 2441 
 2442     mtx_unlock(&Giant);
 2443     return_ACPI_STATUS (status);
 2444 }
 2445 
 2446 /* Initialize a device's wake GPE. */
 2447 int
 2448 acpi_wake_init(device_t dev, int type)
 2449 {
 2450     struct acpi_prw_data prw;
 2451 
 2452     /* Evaluate _PRW to find the GPE. */
 2453     if (acpi_parse_prw(acpi_get_handle(dev), &prw) != 0)
 2454         return (ENXIO);
 2455 
 2456     /* Set the requested type for the GPE (runtime, wake, or both). */
 2457     if (ACPI_FAILURE(AcpiSetGpeType(prw.gpe_handle, prw.gpe_bit, type))) {
 2458         device_printf(dev, "set GPE type failed\n");
 2459         return (ENXIO);
 2460     }
 2461 
 2462     return (0);
 2463 }
 2464 
 2465 /* Enable or disable the device's wake GPE. */
 2466 int
 2467 acpi_wake_set_enable(device_t dev, int enable)
 2468 {
 2469     struct acpi_prw_data prw;
 2470     ACPI_STATUS status;
 2471     int flags;
 2472 
 2473     /* Make sure the device supports waking the system and get the GPE. */
 2474     if (acpi_parse_prw(acpi_get_handle(dev), &prw) != 0)
 2475         return (ENXIO);
 2476 
 2477     flags = acpi_get_flags(dev);
 2478     if (enable) {
 2479         status = AcpiEnableGpe(prw.gpe_handle, prw.gpe_bit, ACPI_NOT_ISR);
 2480         if (ACPI_FAILURE(status)) {
 2481             device_printf(dev, "enable wake failed\n");
 2482             return (ENXIO);
 2483         }
 2484         acpi_set_flags(dev, flags | ACPI_FLAG_WAKE_ENABLED);
 2485     } else {
 2486         status = AcpiDisableGpe(prw.gpe_handle, prw.gpe_bit, ACPI_NOT_ISR);
 2487         if (ACPI_FAILURE(status)) {
 2488             device_printf(dev, "disable wake failed\n");
 2489             return (ENXIO);
 2490         }
 2491         acpi_set_flags(dev, flags & ~ACPI_FLAG_WAKE_ENABLED);
 2492     }
 2493 
 2494     return (0);
 2495 }
 2496 
 2497 static int
 2498 acpi_wake_sleep_prep(ACPI_HANDLE handle, int sstate)
 2499 {
 2500     struct acpi_prw_data prw;
 2501     device_t dev;
 2502 
 2503     /* Check that this is a wake-capable device and get its GPE. */
 2504     if (acpi_parse_prw(handle, &prw) != 0)
 2505         return (ENXIO);
 2506     dev = acpi_get_device(handle);
 2507 
 2508     /*
 2509      * The destination sleep state must be less than (i.e., higher power)
 2510      * or equal to the value specified by _PRW.  If this GPE cannot be
 2511      * enabled for the next sleep state, then disable it.  If it can and
 2512      * the user requested it be enabled, turn on any required power resources
 2513      * and set _PSW.
 2514      */
 2515     if (sstate > prw.lowest_wake) {
 2516         AcpiDisableGpe(prw.gpe_handle, prw.gpe_bit, ACPI_NOT_ISR);
 2517         if (bootverbose)
 2518             device_printf(dev, "wake_prep disabled wake for %s (S%d)\n",
 2519                 acpi_name(handle), sstate);
 2520     } else if (dev && (acpi_get_flags(dev) & ACPI_FLAG_WAKE_ENABLED) != 0) {
 2521         acpi_pwr_wake_enable(handle, 1);
 2522         acpi_SetInteger(handle, "_PSW", 1);
 2523         if (bootverbose)
 2524             device_printf(dev, "wake_prep enabled for %s (S%d)\n",
 2525                 acpi_name(handle), sstate);
 2526     }
 2527 
 2528     return (0);
 2529 }
 2530 
 2531 static int
 2532 acpi_wake_run_prep(ACPI_HANDLE handle, int sstate)
 2533 {
 2534     struct acpi_prw_data prw;
 2535     device_t dev;
 2536 
 2537     /*
 2538      * Check that this is a wake-capable device and get its GPE.  Return
 2539      * now if the user didn't enable this device for wake.
 2540      */
 2541     if (acpi_parse_prw(handle, &prw) != 0)
 2542         return (ENXIO);
 2543     dev = acpi_get_device(handle);
 2544     if (dev == NULL || (acpi_get_flags(dev) & ACPI_FLAG_WAKE_ENABLED) == 0)
 2545         return (0);
 2546 
 2547     /*
 2548      * If this GPE couldn't be enabled for the previous sleep state, it was
 2549      * disabled before going to sleep so re-enable it.  If it was enabled,
 2550      * clear _PSW and turn off any power resources it used.
 2551      */
 2552     if (sstate > prw.lowest_wake) {
 2553         AcpiEnableGpe(prw.gpe_handle, prw.gpe_bit, ACPI_NOT_ISR);
 2554         if (bootverbose)
 2555             device_printf(dev, "run_prep re-enabled %s\n", acpi_name(handle));
 2556     } else {
 2557         acpi_SetInteger(handle, "_PSW", 0);
 2558         acpi_pwr_wake_enable(handle, 0);
 2559         if (bootverbose)
 2560             device_printf(dev, "run_prep cleaned up for %s\n",
 2561                 acpi_name(handle));
 2562     }
 2563 
 2564     return (0);
 2565 }
 2566 
 2567 static ACPI_STATUS
 2568 acpi_wake_prep(ACPI_HANDLE handle, UINT32 level, void *context, void **status)
 2569 {
 2570     int sstate;
 2571 
 2572     /* If suspending, run the sleep prep function, otherwise wake. */
 2573     sstate = *(int *)context;
 2574     if (AcpiGbl_SystemAwakeAndRunning)
 2575         acpi_wake_sleep_prep(handle, sstate);
 2576     else
 2577         acpi_wake_run_prep(handle, sstate);
 2578     return (AE_OK);
 2579 }
 2580 
 2581 /* Walk the tree rooted at acpi0 to prep devices for suspend/resume. */
 2582 static int
 2583 acpi_wake_prep_walk(int sstate)
 2584 {
 2585     ACPI_HANDLE sb_handle;
 2586 
 2587     if (ACPI_SUCCESS(AcpiGetHandle(ACPI_ROOT_OBJECT, "\\_SB_", &sb_handle)))
 2588         AcpiWalkNamespace(ACPI_TYPE_DEVICE, sb_handle, 100,
 2589             acpi_wake_prep, &sstate, NULL);
 2590     return (0);
 2591 }
 2592 
 2593 /* Walk the tree rooted at acpi0 to attach per-device wake sysctls. */
 2594 static int
 2595 acpi_wake_sysctl_walk(device_t dev)
 2596 {
 2597     int error, i, numdevs;
 2598     device_t *devlist;
 2599     device_t child;
 2600     ACPI_STATUS status;
 2601 
 2602     error = device_get_children(dev, &devlist, &numdevs);
 2603     if (error != 0 || numdevs == 0) {
 2604         if (numdevs == 0)
 2605             free(devlist, M_TEMP);
 2606         return (error);
 2607     }
 2608     for (i = 0; i < numdevs; i++) {
 2609         child = devlist[i];
 2610         acpi_wake_sysctl_walk(child);
 2611         if (!device_is_attached(child))
 2612             continue;
 2613         status = AcpiEvaluateObject(acpi_get_handle(child), "_PRW", NULL, NULL);
 2614         if (ACPI_SUCCESS(status)) {
 2615             SYSCTL_ADD_PROC(device_get_sysctl_ctx(child),
 2616                 SYSCTL_CHILDREN(device_get_sysctl_tree(child)), OID_AUTO,
 2617                 "wake", CTLTYPE_INT | CTLFLAG_RW, child, 0,
 2618                 acpi_wake_set_sysctl, "I", "Device set to wake the system");
 2619         }
 2620     }
 2621     free(devlist, M_TEMP);
 2622 
 2623     return (0);
 2624 }
 2625 
 2626 /* Enable or disable wake from userland. */
 2627 static int
 2628 acpi_wake_set_sysctl(SYSCTL_HANDLER_ARGS)
 2629 {
 2630     int enable, error;
 2631     device_t dev;
 2632 
 2633     dev = (device_t)arg1;
 2634     enable = (acpi_get_flags(dev) & ACPI_FLAG_WAKE_ENABLED) ? 1 : 0;
 2635 
 2636     error = sysctl_handle_int(oidp, &enable, 0, req);
 2637     if (error != 0 || req->newptr == NULL)
 2638         return (error);
 2639     if (enable != 0 && enable != 1)
 2640         return (EINVAL);
 2641 
 2642     return (acpi_wake_set_enable(dev, enable));
 2643 }
 2644 
 2645 /* Parse a device's _PRW into a structure. */
 2646 int
 2647 acpi_parse_prw(ACPI_HANDLE h, struct acpi_prw_data *prw)
 2648 {
 2649     ACPI_STATUS                 status;
 2650     ACPI_BUFFER                 prw_buffer;
 2651     ACPI_OBJECT                 *res, *res2;
 2652     int                         error, i, power_count;
 2653 
 2654     if (h == NULL || prw == NULL)
 2655         return (EINVAL);
 2656 
 2657     /*
 2658      * The _PRW object (7.2.9) is only required for devices that have the
 2659      * ability to wake the system from a sleeping state.
 2660      */
 2661     error = EINVAL;
 2662     prw_buffer.Pointer = NULL;
 2663     prw_buffer.Length = ACPI_ALLOCATE_BUFFER;
 2664     status = AcpiEvaluateObject(h, "_PRW", NULL, &prw_buffer);
 2665     if (ACPI_FAILURE(status))
 2666         return (ENOENT);
 2667     res = (ACPI_OBJECT *)prw_buffer.Pointer;
 2668     if (res == NULL)
 2669         return (ENOENT);
 2670     if (!ACPI_PKG_VALID(res, 2))
 2671         goto out;
 2672 
 2673     /*
 2674      * Element 1 of the _PRW object:
 2675      * The lowest power system sleeping state that can be entered while still
 2676      * providing wake functionality.  The sleeping state being entered must
 2677      * be less than (i.e., higher power) or equal to this value.
 2678      */
 2679     if (acpi_PkgInt32(res, 1, &prw->lowest_wake) != 0)
 2680         goto out;
 2681 
 2682     /*
 2683      * Element 0 of the _PRW object:
 2684      */
 2685     switch (res->Package.Elements[0].Type) {
 2686     case ACPI_TYPE_INTEGER:
 2687         /*
 2688          * If the data type of this package element is numeric, then this
 2689          * _PRW package element is the bit index in the GPEx_EN, in the
 2690          * GPE blocks described in the FADT, of the enable bit that is
 2691          * enabled for the wake event.
 2692          */
 2693         prw->gpe_handle = NULL;
 2694         prw->gpe_bit = res->Package.Elements[0].Integer.Value;
 2695         error = 0;
 2696         break;
 2697     case ACPI_TYPE_PACKAGE:
 2698         /*
 2699          * If the data type of this package element is a package, then this
 2700          * _PRW package element is itself a package containing two
 2701          * elements.  The first is an object reference to the GPE Block
 2702          * device that contains the GPE that will be triggered by the wake
 2703          * event.  The second element is numeric and it contains the bit
 2704          * index in the GPEx_EN, in the GPE Block referenced by the
 2705          * first element in the package, of the enable bit that is enabled for
 2706          * the wake event.
 2707          *
 2708          * For example, if this field is a package then it is of the form:
 2709          * Package() {\_SB.PCI0.ISA.GPE, 2}
 2710          */
 2711         res2 = &res->Package.Elements[0];
 2712         if (!ACPI_PKG_VALID(res2, 2))
 2713             goto out;
 2714         prw->gpe_handle = acpi_GetReference(NULL, &res2->Package.Elements[0]);
 2715         if (prw->gpe_handle == NULL)
 2716             goto out;
 2717         if (acpi_PkgInt32(res2, 1, &prw->gpe_bit) != 0)
 2718             goto out;
 2719         error = 0;
 2720         break;
 2721     default:
 2722         goto out;
 2723     }
 2724 
 2725     /* Elements 2 to N of the _PRW object are power resources. */
 2726     power_count = res->Package.Count - 2;
 2727     if (power_count > ACPI_PRW_MAX_POWERRES) {
 2728         printf("ACPI device %s has too many power resources\n", acpi_name(h));
 2729         power_count = 0;
 2730     }
 2731     prw->power_res_count = power_count;
 2732     for (i = 0; i < power_count; i++)
 2733         prw->power_res[i] = res->Package.Elements[i];
 2734 
 2735 out:
 2736     if (prw_buffer.Pointer != NULL)
 2737         AcpiOsFree(prw_buffer.Pointer);
 2738     return (error);
 2739 }
 2740 
 2741 /*
 2742  * ACPI Event Handlers
 2743  */
 2744 
 2745 /* System Event Handlers (registered by EVENTHANDLER_REGISTER) */
 2746 
 2747 static void
 2748 acpi_system_eventhandler_sleep(void *arg, int state)
 2749 {
 2750     int ret;
 2751 
 2752     ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, state);
 2753 
 2754     /* Check if button action is disabled. */
 2755     if (state == ACPI_S_STATES_MAX + 1)
 2756         return;
 2757 
 2758     /* Request that the system prepare to enter the given suspend state. */
 2759     ret = acpi_ReqSleepState((struct acpi_softc *)arg, state);
 2760     if (ret != 0)
 2761         printf("acpi: request to enter state S%d failed (err %d)\n",
 2762             state, ret);
 2763 
 2764     return_VOID;
 2765 }
 2766 
 2767 static void
 2768 acpi_system_eventhandler_wakeup(void *arg, int state)
 2769 {
 2770 
 2771     ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, state);
 2772 
 2773     /* Currently, nothing to do for wakeup. */
 2774 
 2775     return_VOID;
 2776 }
 2777 
 2778 /* 
 2779  * ACPICA Event Handlers (FixedEvent, also called from button notify handler)
 2780  */
 2781 UINT32
 2782 acpi_event_power_button_sleep(void *context)
 2783 {
 2784     struct acpi_softc   *sc = (struct acpi_softc *)context;
 2785 
 2786     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 2787 
 2788     EVENTHANDLER_INVOKE(acpi_sleep_event, sc->acpi_power_button_sx);
 2789 
 2790     return_VALUE (ACPI_INTERRUPT_HANDLED);
 2791 }
 2792 
 2793 UINT32
 2794 acpi_event_power_button_wake(void *context)
 2795 {
 2796     struct acpi_softc   *sc = (struct acpi_softc *)context;
 2797 
 2798     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 2799 
 2800     EVENTHANDLER_INVOKE(acpi_wakeup_event, sc->acpi_power_button_sx);
 2801 
 2802     return_VALUE (ACPI_INTERRUPT_HANDLED);
 2803 }
 2804 
 2805 UINT32
 2806 acpi_event_sleep_button_sleep(void *context)
 2807 {
 2808     struct acpi_softc   *sc = (struct acpi_softc *)context;
 2809 
 2810     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 2811 
 2812     EVENTHANDLER_INVOKE(acpi_sleep_event, sc->acpi_sleep_button_sx);
 2813 
 2814     return_VALUE (ACPI_INTERRUPT_HANDLED);
 2815 }
 2816 
 2817 UINT32
 2818 acpi_event_sleep_button_wake(void *context)
 2819 {
 2820     struct acpi_softc   *sc = (struct acpi_softc *)context;
 2821 
 2822     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 2823 
 2824     EVENTHANDLER_INVOKE(acpi_wakeup_event, sc->acpi_sleep_button_sx);
 2825 
 2826     return_VALUE (ACPI_INTERRUPT_HANDLED);
 2827 }
 2828 
 2829 /*
 2830  * XXX This static buffer is suboptimal.  There is no locking so only
 2831  * use this for single-threaded callers.
 2832  */
 2833 char *
 2834 acpi_name(ACPI_HANDLE handle)
 2835 {
 2836     ACPI_BUFFER buf;
 2837     static char data[256];
 2838 
 2839     buf.Length = sizeof(data);
 2840     buf.Pointer = data;
 2841 
 2842     if (handle && ACPI_SUCCESS(AcpiGetName(handle, ACPI_FULL_PATHNAME, &buf)))
 2843         return (data);
 2844     return ("(unknown)");
 2845 }
 2846 
 2847 /*
 2848  * Debugging/bug-avoidance.  Avoid trying to fetch info on various
 2849  * parts of the namespace.
 2850  */
 2851 int
 2852 acpi_avoid(ACPI_HANDLE handle)
 2853 {
 2854     char        *cp, *env, *np;
 2855     int         len;
 2856 
 2857     np = acpi_name(handle);
 2858     if (*np == '\\')
 2859         np++;
 2860     if ((env = getenv("debug.acpi.avoid")) == NULL)
 2861         return (0);
 2862 
 2863     /* Scan the avoid list checking for a match */
 2864     cp = env;
 2865     for (;;) {
 2866         while (*cp != 0 && isspace(*cp))
 2867             cp++;
 2868         if (*cp == 0)
 2869             break;
 2870         len = 0;
 2871         while (cp[len] != 0 && !isspace(cp[len]))
 2872             len++;
 2873         if (!strncmp(cp, np, len)) {
 2874             freeenv(env);
 2875             return(1);
 2876         }
 2877         cp += len;
 2878     }
 2879     freeenv(env);
 2880 
 2881     return (0);
 2882 }
 2883 
 2884 /*
 2885  * Debugging/bug-avoidance.  Disable ACPI subsystem components.
 2886  */
 2887 int
 2888 acpi_disabled(char *subsys)
 2889 {
 2890     char        *cp, *env;
 2891     int         len;
 2892 
 2893     if ((env = getenv("debug.acpi.disabled")) == NULL)
 2894         return (0);
 2895     if (strcmp(env, "all") == 0) {
 2896         freeenv(env);
 2897         return (1);
 2898     }
 2899 
 2900     /* Scan the disable list, checking for a match. */
 2901     cp = env;
 2902     for (;;) {
 2903         while (*cp != '\0' && isspace(*cp))
 2904             cp++;
 2905         if (*cp == '\0')
 2906             break;
 2907         len = 0;
 2908         while (cp[len] != '\0' && !isspace(cp[len]))
 2909             len++;
 2910         if (strncmp(cp, subsys, len) == 0) {
 2911             freeenv(env);
 2912             return (1);
 2913         }
 2914         cp += len;
 2915     }
 2916     freeenv(env);
 2917 
 2918     return (0);
 2919 }
 2920 
 2921 /*
 2922  * Control interface.
 2923  *
 2924  * We multiplex ioctls for all participating ACPI devices here.  Individual 
 2925  * drivers wanting to be accessible via /dev/acpi should use the
 2926  * register/deregister interface to make their handlers visible.
 2927  */
 2928 struct acpi_ioctl_hook
 2929 {
 2930     TAILQ_ENTRY(acpi_ioctl_hook) link;
 2931     u_long                       cmd;
 2932     acpi_ioctl_fn                fn;
 2933     void                         *arg;
 2934 };
 2935 
 2936 static TAILQ_HEAD(,acpi_ioctl_hook)     acpi_ioctl_hooks;
 2937 static int                              acpi_ioctl_hooks_initted;
 2938 
 2939 int
 2940 acpi_register_ioctl(u_long cmd, acpi_ioctl_fn fn, void *arg)
 2941 {
 2942     struct acpi_ioctl_hook      *hp;
 2943 
 2944     if ((hp = malloc(sizeof(*hp), M_ACPIDEV, M_NOWAIT)) == NULL)
 2945         return (ENOMEM);
 2946     hp->cmd = cmd;
 2947     hp->fn = fn;
 2948     hp->arg = arg;
 2949 
 2950     ACPI_LOCK(acpi);
 2951     if (acpi_ioctl_hooks_initted == 0) {
 2952         TAILQ_INIT(&acpi_ioctl_hooks);
 2953         acpi_ioctl_hooks_initted = 1;
 2954     }
 2955     TAILQ_INSERT_TAIL(&acpi_ioctl_hooks, hp, link);
 2956     ACPI_UNLOCK(acpi);
 2957 
 2958     return (0);
 2959 }
 2960 
 2961 void
 2962 acpi_deregister_ioctl(u_long cmd, acpi_ioctl_fn fn)
 2963 {
 2964     struct acpi_ioctl_hook      *hp;
 2965 
 2966     ACPI_LOCK(acpi);
 2967     TAILQ_FOREACH(hp, &acpi_ioctl_hooks, link)
 2968         if (hp->cmd == cmd && hp->fn == fn)
 2969             break;
 2970 
 2971     if (hp != NULL) {
 2972         TAILQ_REMOVE(&acpi_ioctl_hooks, hp, link);
 2973         free(hp, M_ACPIDEV);
 2974     }
 2975     ACPI_UNLOCK(acpi);
 2976 }
 2977 
 2978 static int
 2979 acpiopen(struct cdev *dev, int flag, int fmt, d_thread_t *td)
 2980 {
 2981     return (0);
 2982 }
 2983 
 2984 static int
 2985 acpiclose(struct cdev *dev, int flag, int fmt, d_thread_t *td)
 2986 {
 2987     return (0);
 2988 }
 2989 
 2990 static int
 2991 acpiioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, d_thread_t *td)
 2992 {
 2993     struct acpi_softc           *sc;
 2994     struct acpi_ioctl_hook      *hp;
 2995     int                         error, state;
 2996 
 2997     error = 0;
 2998     hp = NULL;
 2999     sc = dev->si_drv1;
 3000 
 3001     /*
 3002      * Scan the list of registered ioctls, looking for handlers.
 3003      */
 3004     ACPI_LOCK(acpi);
 3005     if (acpi_ioctl_hooks_initted)
 3006         TAILQ_FOREACH(hp, &acpi_ioctl_hooks, link) {
 3007             if (hp->cmd == cmd)
 3008                 break;
 3009         }
 3010     ACPI_UNLOCK(acpi);
 3011     if (hp)
 3012         return (hp->fn(cmd, addr, hp->arg));
 3013 
 3014     /*
 3015      * Core ioctls are not permitted for non-writable user.
 3016      * Currently, other ioctls just fetch information.
 3017      * Not changing system behavior.
 3018      */
 3019     if ((flag & FWRITE) == 0)
 3020         return (EPERM);
 3021 
 3022     /* Core system ioctls. */
 3023     switch (cmd) {
 3024     case ACPIIO_REQSLPSTATE:
 3025         state = *(int *)addr;
 3026         if (state != ACPI_STATE_S5)
 3027             error = acpi_ReqSleepState(sc, state);
 3028         else {
 3029             printf("power off via acpi ioctl not supported\n");
 3030             error = ENXIO;
 3031         }
 3032         break;
 3033     case ACPIIO_ACKSLPSTATE:
 3034         error = *(int *)addr;
 3035         error = acpi_AckSleepState(sc->acpi_clone, error);
 3036         break;
 3037     case ACPIIO_SETSLPSTATE:    /* DEPRECATED */
 3038         error = EINVAL;
 3039         state = *(int *)addr;
 3040         if (state >= ACPI_STATE_S0 && state <= ACPI_S_STATES_MAX)
 3041             if (ACPI_SUCCESS(acpi_SetSleepState(sc, state)))
 3042                 error = 0;
 3043         break;
 3044     default:
 3045         error = ENXIO;
 3046         break;
 3047     }
 3048 
 3049     return (error);
 3050 }
 3051 
 3052 static int
 3053 acpi_supported_sleep_state_sysctl(SYSCTL_HANDLER_ARGS)
 3054 {
 3055     int error;
 3056     struct sbuf sb;
 3057     UINT8 state, TypeA, TypeB;
 3058 
 3059     sbuf_new(&sb, NULL, 32, SBUF_AUTOEXTEND);
 3060     for (state = ACPI_STATE_S1; state < ACPI_S_STATES_MAX + 1; state++)
 3061         if (ACPI_SUCCESS(AcpiGetSleepTypeData(state, &TypeA, &TypeB)))
 3062             sbuf_printf(&sb, "S%d ", state);
 3063     sbuf_trim(&sb);
 3064     sbuf_finish(&sb);
 3065     error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req);
 3066     sbuf_delete(&sb);
 3067     return (error);
 3068 }
 3069 
 3070 static int
 3071 acpi_sleep_state_sysctl(SYSCTL_HANDLER_ARGS)
 3072 {
 3073     char sleep_state[10];
 3074     int error;
 3075     u_int new_state, old_state;
 3076 
 3077     old_state = *(u_int *)oidp->oid_arg1;
 3078     if (old_state > ACPI_S_STATES_MAX + 1)
 3079         strlcpy(sleep_state, "unknown", sizeof(sleep_state));
 3080     else
 3081         strlcpy(sleep_state, sleep_state_names[old_state], sizeof(sleep_state));
 3082     error = sysctl_handle_string(oidp, sleep_state, sizeof(sleep_state), req);
 3083     if (error == 0 && req->newptr != NULL) {
 3084         new_state = ACPI_STATE_S0;
 3085         for (; new_state <= ACPI_S_STATES_MAX + 1; new_state++)
 3086             if (strcmp(sleep_state, sleep_state_names[new_state]) == 0)
 3087                 break;
 3088         if (new_state <= ACPI_S_STATES_MAX + 1) {
 3089             if (new_state != old_state)
 3090                 *(u_int *)oidp->oid_arg1 = new_state;
 3091         } else
 3092             error = EINVAL;
 3093     }
 3094 
 3095     return (error);
 3096 }
 3097 
 3098 /* Inform devctl(4) when we receive a Notify. */
 3099 void
 3100 acpi_UserNotify(const char *subsystem, ACPI_HANDLE h, uint8_t notify)
 3101 {
 3102     char                notify_buf[16];
 3103     ACPI_BUFFER         handle_buf;
 3104     ACPI_STATUS         status;
 3105 
 3106     if (subsystem == NULL)
 3107         return;
 3108 
 3109     handle_buf.Pointer = NULL;
 3110     handle_buf.Length = ACPI_ALLOCATE_BUFFER;
 3111     status = AcpiNsHandleToPathname(h, &handle_buf);
 3112     if (ACPI_FAILURE(status))
 3113         return;
 3114     snprintf(notify_buf, sizeof(notify_buf), "notify=0x%02x", notify);
 3115     devctl_notify("ACPI", subsystem, handle_buf.Pointer, notify_buf);
 3116     AcpiOsFree(handle_buf.Pointer);
 3117 }
 3118 
 3119 #ifdef ACPI_DEBUG
 3120 /*
 3121  * Support for parsing debug options from the kernel environment.
 3122  *
 3123  * Bits may be set in the AcpiDbgLayer and AcpiDbgLevel debug registers
 3124  * by specifying the names of the bits in the debug.acpi.layer and
 3125  * debug.acpi.level environment variables.  Bits may be unset by 
 3126  * prefixing the bit name with !.
 3127  */
 3128 struct debugtag
 3129 {
 3130     char        *name;
 3131     UINT32      value;
 3132 };
 3133 
 3134 static struct debugtag  dbg_layer[] = {
 3135     {"ACPI_UTILITIES",          ACPI_UTILITIES},
 3136     {"ACPI_HARDWARE",           ACPI_HARDWARE},
 3137     {"ACPI_EVENTS",             ACPI_EVENTS},
 3138     {"ACPI_TABLES",             ACPI_TABLES},
 3139     {"ACPI_NAMESPACE",          ACPI_NAMESPACE},
 3140     {"ACPI_PARSER",             ACPI_PARSER},
 3141     {"ACPI_DISPATCHER",         ACPI_DISPATCHER},
 3142     {"ACPI_EXECUTER",           ACPI_EXECUTER},
 3143     {"ACPI_RESOURCES",          ACPI_RESOURCES},
 3144     {"ACPI_CA_DEBUGGER",        ACPI_CA_DEBUGGER},
 3145     {"ACPI_OS_SERVICES",        ACPI_OS_SERVICES},
 3146     {"ACPI_CA_DISASSEMBLER",    ACPI_CA_DISASSEMBLER},
 3147     {"ACPI_ALL_COMPONENTS",     ACPI_ALL_COMPONENTS},
 3148 
 3149     {"ACPI_AC_ADAPTER",         ACPI_AC_ADAPTER},
 3150     {"ACPI_BATTERY",            ACPI_BATTERY},
 3151     {"ACPI_BUS",                ACPI_BUS},
 3152     {"ACPI_BUTTON",             ACPI_BUTTON},
 3153     {"ACPI_EC",                 ACPI_EC},
 3154     {"ACPI_FAN",                ACPI_FAN},
 3155     {"ACPI_POWERRES",           ACPI_POWERRES},
 3156     {"ACPI_PROCESSOR",          ACPI_PROCESSOR},
 3157     {"ACPI_THERMAL",            ACPI_THERMAL},
 3158     {"ACPI_TIMER",              ACPI_TIMER},
 3159     {"ACPI_ALL_DRIVERS",        ACPI_ALL_DRIVERS},
 3160     {NULL, 0}
 3161 };
 3162 
 3163 static struct debugtag dbg_level[] = {
 3164     {"ACPI_LV_ERROR",           ACPI_LV_ERROR},
 3165     {"ACPI_LV_WARN",            ACPI_LV_WARN},
 3166     {"ACPI_LV_INIT",            ACPI_LV_INIT},
 3167     {"ACPI_LV_DEBUG_OBJECT",    ACPI_LV_DEBUG_OBJECT},
 3168     {"ACPI_LV_INFO",            ACPI_LV_INFO},
 3169     {"ACPI_LV_ALL_EXCEPTIONS",  ACPI_LV_ALL_EXCEPTIONS},
 3170 
 3171     /* Trace verbosity level 1 [Standard Trace Level] */
 3172     {"ACPI_LV_INIT_NAMES",      ACPI_LV_INIT_NAMES},
 3173     {"ACPI_LV_PARSE",           ACPI_LV_PARSE},
 3174     {"ACPI_LV_LOAD",            ACPI_LV_LOAD},
 3175     {"ACPI_LV_DISPATCH",        ACPI_LV_DISPATCH},
 3176     {"ACPI_LV_EXEC",            ACPI_LV_EXEC},
 3177     {"ACPI_LV_NAMES",           ACPI_LV_NAMES},
 3178     {"ACPI_LV_OPREGION",        ACPI_LV_OPREGION},
 3179     {"ACPI_LV_BFIELD",          ACPI_LV_BFIELD},
 3180     {"ACPI_LV_TABLES",          ACPI_LV_TABLES},
 3181     {"ACPI_LV_VALUES",          ACPI_LV_VALUES},
 3182     {"ACPI_LV_OBJECTS",         ACPI_LV_OBJECTS},
 3183     {"ACPI_LV_RESOURCES",       ACPI_LV_RESOURCES},
 3184     {"ACPI_LV_USER_REQUESTS",   ACPI_LV_USER_REQUESTS},
 3185     {"ACPI_LV_PACKAGE",         ACPI_LV_PACKAGE},
 3186     {"ACPI_LV_VERBOSITY1",      ACPI_LV_VERBOSITY1},
 3187 
 3188     /* Trace verbosity level 2 [Function tracing and memory allocation] */
 3189     {"ACPI_LV_ALLOCATIONS",     ACPI_LV_ALLOCATIONS},
 3190     {"ACPI_LV_FUNCTIONS",       ACPI_LV_FUNCTIONS},
 3191     {"ACPI_LV_OPTIMIZATIONS",   ACPI_LV_OPTIMIZATIONS},
 3192     {"ACPI_LV_VERBOSITY2",      ACPI_LV_VERBOSITY2},
 3193     {"ACPI_LV_ALL",             ACPI_LV_ALL},
 3194 
 3195     /* Trace verbosity level 3 [Threading, I/O, and Interrupts] */
 3196     {"ACPI_LV_MUTEX",           ACPI_LV_MUTEX},
 3197     {"ACPI_LV_THREADS",         ACPI_LV_THREADS},
 3198     {"ACPI_LV_IO",              ACPI_LV_IO},
 3199     {"ACPI_LV_INTERRUPTS",      ACPI_LV_INTERRUPTS},
 3200     {"ACPI_LV_VERBOSITY3",      ACPI_LV_VERBOSITY3},
 3201 
 3202     /* Exceptionally verbose output -- also used in the global "DebugLevel"  */
 3203     {"ACPI_LV_AML_DISASSEMBLE", ACPI_LV_AML_DISASSEMBLE},
 3204     {"ACPI_LV_VERBOSE_INFO",    ACPI_LV_VERBOSE_INFO},
 3205     {"ACPI_LV_FULL_TABLES",     ACPI_LV_FULL_TABLES},
 3206     {"ACPI_LV_EVENTS",          ACPI_LV_EVENTS},
 3207     {"ACPI_LV_VERBOSE",         ACPI_LV_VERBOSE},
 3208     {NULL, 0}
 3209 };    
 3210 
 3211 static void
 3212 acpi_parse_debug(char *cp, struct debugtag *tag, UINT32 *flag)
 3213 {
 3214     char        *ep;
 3215     int         i, l;
 3216     int         set;
 3217 
 3218     while (*cp) {
 3219         if (isspace(*cp)) {
 3220             cp++;
 3221             continue;
 3222         }
 3223         ep = cp;
 3224         while (*ep && !isspace(*ep))
 3225             ep++;
 3226         if (*cp == '!') {
 3227             set = 0;
 3228             cp++;
 3229             if (cp == ep)
 3230                 continue;
 3231         } else {
 3232             set = 1;
 3233         }
 3234         l = ep - cp;
 3235         for (i = 0; tag[i].name != NULL; i++) {
 3236             if (!strncmp(cp, tag[i].name, l)) {
 3237                 if (set)
 3238                     *flag |= tag[i].value;
 3239                 else
 3240                     *flag &= ~tag[i].value;
 3241             }
 3242         }
 3243         cp = ep;
 3244     }
 3245 }
 3246 
 3247 static void
 3248 acpi_set_debugging(void *junk)
 3249 {
 3250     char        *layer, *level;
 3251 
 3252     if (cold) {
 3253         AcpiDbgLayer = 0;
 3254         AcpiDbgLevel = 0;
 3255     }
 3256 
 3257     layer = getenv("debug.acpi.layer");
 3258     level = getenv("debug.acpi.level");
 3259     if (layer == NULL && level == NULL)
 3260         return;
 3261 
 3262     printf("ACPI set debug");
 3263     if (layer != NULL) {
 3264         if (strcmp("NONE", layer) != 0)
 3265             printf(" layer '%s'", layer);
 3266         acpi_parse_debug(layer, &dbg_layer[0], &AcpiDbgLayer);
 3267         freeenv(layer);
 3268     }
 3269     if (level != NULL) {
 3270         if (strcmp("NONE", level) != 0)
 3271             printf(" level '%s'", level);
 3272         acpi_parse_debug(level, &dbg_level[0], &AcpiDbgLevel);
 3273         freeenv(level);
 3274     }
 3275     printf("\n");
 3276 }
 3277 
 3278 SYSINIT(acpi_debugging, SI_SUB_TUNABLES, SI_ORDER_ANY, acpi_set_debugging,
 3279         NULL);
 3280 
 3281 static int
 3282 acpi_debug_sysctl(SYSCTL_HANDLER_ARGS)
 3283 {
 3284     int          error, *dbg;
 3285     struct       debugtag *tag;
 3286     struct       sbuf sb;
 3287 
 3288     if (sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND) == NULL)
 3289         return (ENOMEM);
 3290     if (strcmp(oidp->oid_arg1, "debug.acpi.layer") == 0) {
 3291         tag = &dbg_layer[0];
 3292         dbg = &AcpiDbgLayer;
 3293     } else {
 3294         tag = &dbg_level[0];
 3295         dbg = &AcpiDbgLevel;
 3296     }
 3297 
 3298     /* Get old values if this is a get request. */
 3299     ACPI_SERIAL_BEGIN(acpi);
 3300     if (*dbg == 0) {
 3301         sbuf_cpy(&sb, "NONE");
 3302     } else if (req->newptr == NULL) {
 3303         for (; tag->name != NULL; tag++) {
 3304             if ((*dbg & tag->value) == tag->value)
 3305                 sbuf_printf(&sb, "%s ", tag->name);
 3306         }
 3307     }
 3308     sbuf_trim(&sb);
 3309     sbuf_finish(&sb);
 3310 
 3311     /* Copy out the old values to the user. */
 3312     error = SYSCTL_OUT(req, sbuf_data(&sb), sbuf_len(&sb));
 3313     sbuf_delete(&sb);
 3314 
 3315     /* If the user is setting a string, parse it. */
 3316     if (error == 0 && req->newptr != NULL) {
 3317         *dbg = 0;
 3318         setenv((char *)oidp->oid_arg1, (char *)req->newptr);
 3319         acpi_set_debugging(NULL);
 3320     }
 3321     ACPI_SERIAL_END(acpi);
 3322 
 3323     return (error);
 3324 }
 3325 
 3326 SYSCTL_PROC(_debug_acpi, OID_AUTO, layer, CTLFLAG_RW | CTLTYPE_STRING,
 3327             "debug.acpi.layer", 0, acpi_debug_sysctl, "A", "");
 3328 SYSCTL_PROC(_debug_acpi, OID_AUTO, level, CTLFLAG_RW | CTLTYPE_STRING,
 3329             "debug.acpi.level", 0, acpi_debug_sysctl, "A", "");
 3330 #endif /* ACPI_DEBUG */
 3331 
 3332 static int
 3333 acpi_pm_func(u_long cmd, void *arg, ...)
 3334 {
 3335         int     state, acpi_state;
 3336         int     error;
 3337         struct  acpi_softc *sc;
 3338         va_list ap;
 3339 
 3340         error = 0;
 3341         switch (cmd) {
 3342         case POWER_CMD_SUSPEND:
 3343                 sc = (struct acpi_softc *)arg;
 3344                 if (sc == NULL) {
 3345                         error = EINVAL;
 3346                         goto out;
 3347                 }
 3348 
 3349                 va_start(ap, arg);
 3350                 state = va_arg(ap, int);
 3351                 va_end(ap);
 3352 
 3353                 switch (state) {
 3354                 case POWER_SLEEP_STATE_STANDBY:
 3355                         acpi_state = sc->acpi_standby_sx;
 3356                         break;
 3357                 case POWER_SLEEP_STATE_SUSPEND:
 3358                         acpi_state = sc->acpi_suspend_sx;
 3359                         break;
 3360                 case POWER_SLEEP_STATE_HIBERNATE:
 3361                         acpi_state = ACPI_STATE_S4;
 3362                         break;
 3363                 default:
 3364                         error = EINVAL;
 3365                         goto out;
 3366                 }
 3367 
 3368                 if (ACPI_FAILURE(acpi_EnterSleepState(sc, acpi_state)))
 3369                         error = ENXIO;
 3370                 break;
 3371         default:
 3372                 error = EINVAL;
 3373                 goto out;
 3374         }
 3375 
 3376 out:
 3377         return (error);
 3378 }
 3379 
 3380 static void
 3381 acpi_pm_register(void *arg)
 3382 {
 3383     if (!cold || resource_disabled("acpi", 0))
 3384         return;
 3385 
 3386     power_pm_register(POWER_PM_TYPE_ACPI, acpi_pm_func, NULL);
 3387 }
 3388 
 3389 SYSINIT(power, SI_SUB_KLD, SI_ORDER_ANY, acpi_pm_register, 0);

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