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: releng/6.0/sys/dev/acpica/acpi.c 151673 2005-10-25 20:51:58Z njl $");
   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/clock.h>
   52 #include <machine/resource.h>
   53 #include <machine/bus.h>
   54 #include <sys/rman.h>
   55 #include <isa/isavar.h>
   56 #include <isa/pnpvar.h>
   57 
   58 #include "acpi.h"
   59 #include <dev/acpica/acpivar.h>
   60 #include <dev/acpica/acpiio.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 MALLOC_DEFINE(M_ACPIDEV, "acpidev", "ACPI devices");
   68 
   69 /* Hooks for the ACPI CA debugging infrastructure */
   70 #define _COMPONENT      ACPI_BUS
   71 ACPI_MODULE_NAME("ACPI")
   72 
   73 static d_open_t         acpiopen;
   74 static d_close_t        acpiclose;
   75 static d_ioctl_t        acpiioctl;
   76 
   77 static struct cdevsw acpi_cdevsw = {
   78         .d_version =    D_VERSION,
   79         .d_open =       acpiopen,
   80         .d_close =      acpiclose,
   81         .d_ioctl =      acpiioctl,
   82         .d_name =       "acpi",
   83 };
   84 
   85 /* Global mutex for locking access to the ACPI subsystem. */
   86 struct mtx      acpi_mutex;
   87 
   88 /* Bitmap of device quirks. */
   89 int             acpi_quirks;
   90 
   91 static int      acpi_modevent(struct module *mod, int event, void *junk);
   92 static void     acpi_identify(driver_t *driver, device_t parent);
   93 static int      acpi_probe(device_t dev);
   94 static int      acpi_attach(device_t dev);
   95 static int      acpi_suspend(device_t dev);
   96 static int      acpi_resume(device_t dev);
   97 static int      acpi_shutdown(device_t dev);
   98 static device_t acpi_add_child(device_t bus, int order, const char *name,
   99                         int unit);
  100 static int      acpi_print_child(device_t bus, device_t child);
  101 static void     acpi_probe_nomatch(device_t bus, device_t child);
  102 static void     acpi_driver_added(device_t dev, driver_t *driver);
  103 static int      acpi_read_ivar(device_t dev, device_t child, int index,
  104                         uintptr_t *result);
  105 static int      acpi_write_ivar(device_t dev, device_t child, int index,
  106                         uintptr_t value);
  107 static struct resource_list *acpi_get_rlist(device_t dev, device_t child);
  108 static int      acpi_sysres_alloc(device_t dev);
  109 static struct resource_list_entry *acpi_sysres_find(device_t dev, int type,
  110                     u_long addr);
  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 int      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 void     acpi_shutdown_final(void *arg, int howto);
  140 static void     acpi_enable_fixed_events(struct acpi_softc *sc);
  141 static int      acpi_wake_sleep_prep(ACPI_HANDLE handle, int sstate);
  142 static int      acpi_wake_run_prep(ACPI_HANDLE handle, int sstate);
  143 static int      acpi_wake_prep_walk(int sstate);
  144 static int      acpi_wake_sysctl_walk(device_t dev);
  145 static int      acpi_wake_set_sysctl(SYSCTL_HANDLER_ARGS);
  146 static void     acpi_system_eventhandler_sleep(void *arg, int state);
  147 static void     acpi_system_eventhandler_wakeup(void *arg, int state);
  148 static int      acpi_supported_sleep_state_sysctl(SYSCTL_HANDLER_ARGS);
  149 static int      acpi_sleep_state_sysctl(SYSCTL_HANDLER_ARGS);
  150 static int      acpi_pm_func(u_long cmd, void *arg, ...);
  151 static int      acpi_child_location_str_method(device_t acdev, device_t child,
  152                                                char *buf, size_t buflen);
  153 static int      acpi_child_pnpinfo_str_method(device_t acdev, device_t child,
  154                                               char *buf, size_t buflen);
  155 
  156 static device_method_t acpi_methods[] = {
  157     /* Device interface */
  158     DEVMETHOD(device_identify,          acpi_identify),
  159     DEVMETHOD(device_probe,             acpi_probe),
  160     DEVMETHOD(device_attach,            acpi_attach),
  161     DEVMETHOD(device_shutdown,          acpi_shutdown),
  162     DEVMETHOD(device_detach,            bus_generic_detach),
  163     DEVMETHOD(device_suspend,           acpi_suspend),
  164     DEVMETHOD(device_resume,            acpi_resume),
  165 
  166     /* Bus interface */
  167     DEVMETHOD(bus_add_child,            acpi_add_child),
  168     DEVMETHOD(bus_print_child,          acpi_print_child),
  169     DEVMETHOD(bus_probe_nomatch,        acpi_probe_nomatch),
  170     DEVMETHOD(bus_driver_added,         acpi_driver_added),
  171     DEVMETHOD(bus_read_ivar,            acpi_read_ivar),
  172     DEVMETHOD(bus_write_ivar,           acpi_write_ivar),
  173     DEVMETHOD(bus_get_resource_list,    acpi_get_rlist),
  174     DEVMETHOD(bus_set_resource,         bus_generic_rl_set_resource),
  175     DEVMETHOD(bus_get_resource,         bus_generic_rl_get_resource),
  176     DEVMETHOD(bus_alloc_resource,       acpi_alloc_resource),
  177     DEVMETHOD(bus_release_resource,     acpi_release_resource),
  178     DEVMETHOD(bus_delete_resource,      acpi_delete_resource),
  179     DEVMETHOD(bus_child_pnpinfo_str,    acpi_child_pnpinfo_str_method),
  180     DEVMETHOD(bus_child_location_str,   acpi_child_location_str_method),
  181     DEVMETHOD(bus_activate_resource,    bus_generic_activate_resource),
  182     DEVMETHOD(bus_deactivate_resource,  bus_generic_deactivate_resource),
  183     DEVMETHOD(bus_setup_intr,           bus_generic_setup_intr),
  184     DEVMETHOD(bus_teardown_intr,        bus_generic_teardown_intr),
  185 
  186     /* ACPI bus */
  187     DEVMETHOD(acpi_id_probe,            acpi_device_id_probe),
  188     DEVMETHOD(acpi_evaluate_object,     acpi_device_eval_obj),
  189     DEVMETHOD(acpi_pwr_for_sleep,       acpi_device_pwr_for_sleep),
  190     DEVMETHOD(acpi_scan_children,       acpi_device_scan_children),
  191 
  192     /* PCI emulation */
  193     DEVMETHOD(pci_set_powerstate,       acpi_set_powerstate_method),
  194 
  195     /* ISA emulation */
  196     DEVMETHOD(isa_pnp_probe,            acpi_isa_pnp_probe),
  197 
  198     {0, 0}
  199 };
  200 
  201 static driver_t acpi_driver = {
  202     "acpi",
  203     acpi_methods,
  204     sizeof(struct acpi_softc),
  205 };
  206 
  207 static devclass_t acpi_devclass;
  208 DRIVER_MODULE(acpi, nexus, acpi_driver, acpi_devclass, acpi_modevent, 0);
  209 MODULE_VERSION(acpi, 1);
  210 
  211 ACPI_SERIAL_DECL(acpi, "ACPI root bus");
  212 
  213 /* Local pools for managing system resources for ACPI child devices. */
  214 static struct rman acpi_rman_io, acpi_rman_mem;
  215 
  216 #define ACPI_MINIMUM_AWAKETIME  5
  217 
  218 static const char* sleep_state_names[] = {
  219     "S0", "S1", "S2", "S3", "S4", "S5", "NONE"};
  220 
  221 SYSCTL_NODE(_debug, OID_AUTO, acpi, CTLFLAG_RW, NULL, "ACPI debugging");
  222 static char acpi_ca_version[12];
  223 SYSCTL_STRING(_debug_acpi, OID_AUTO, acpi_ca_version, CTLFLAG_RD,
  224               acpi_ca_version, 0, "Version of Intel ACPI-CA");
  225 
  226 /*
  227  * Allow override of whether methods execute in parallel or not.
  228  * Enable this for serial behavior, which fixes "AE_ALREADY_EXISTS"
  229  * errors for AML that really can't handle parallel method execution.
  230  * It is off by default since this breaks recursive methods and
  231  * some IBMs use such code.
  232  */
  233 static int acpi_serialize_methods;
  234 TUNABLE_INT("hw.acpi.serialize_methods", &acpi_serialize_methods);
  235 
  236 /* Power devices off and on in suspend and resume.  XXX Remove once tested. */
  237 static int acpi_do_powerstate = 1;
  238 TUNABLE_INT("debug.acpi.do_powerstate", &acpi_do_powerstate);
  239 SYSCTL_INT(_debug_acpi, OID_AUTO, do_powerstate, CTLFLAG_RW,
  240     &acpi_do_powerstate, 1, "Turn off devices when suspending.");
  241 
  242 /* Allow users to override quirks. */
  243 TUNABLE_INT("debug.acpi.quirks", &acpi_quirks);
  244 
  245 /*
  246  * ACPI can only be loaded as a module by the loader; activating it after
  247  * system bootstrap time is not useful, and can be fatal to the system.
  248  * It also cannot be unloaded, since the entire system bus heirarchy hangs
  249  * off it.
  250  */
  251 static int
  252 acpi_modevent(struct module *mod, int event, void *junk)
  253 {
  254     switch (event) {
  255     case MOD_LOAD:
  256         if (!cold) {
  257             printf("The ACPI driver cannot be loaded after boot.\n");
  258             return (EPERM);
  259         }
  260         break;
  261     case MOD_UNLOAD:
  262         if (!cold && power_pm_get_type() == POWER_PM_TYPE_ACPI)
  263             return (EBUSY);
  264         break;
  265     default:
  266         break;
  267     }
  268     return (0);
  269 }
  270 
  271 /*
  272  * Perform early initialization.
  273  */
  274 ACPI_STATUS
  275 acpi_Startup(void)
  276 {
  277     static int started = 0;
  278     int error, val;
  279 
  280     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  281 
  282     /* Only run the startup code once.  The MADT driver also calls this. */
  283     if (started)
  284         return_VALUE (0);
  285     started = 1;
  286 
  287     /* Initialise the ACPI mutex */
  288     mtx_init(&acpi_mutex, "ACPI global lock", NULL, MTX_DEF);
  289 
  290     /*
  291      * Set the globals from our tunables.  This is needed because ACPI-CA
  292      * uses UINT8 for some values and we have no tunable_byte.
  293      */
  294     AcpiGbl_AllMethodsSerialized = acpi_serialize_methods;
  295     AcpiGbl_EnableInterpreterSlack = TRUE;
  296 
  297     /* Start up the ACPI CA subsystem. */
  298     if (ACPI_FAILURE(error = AcpiInitializeSubsystem())) {
  299         printf("ACPI: initialisation failed: %s\n", AcpiFormatException(error));
  300         return_VALUE (error);
  301     }
  302 
  303     if (ACPI_FAILURE(error = AcpiLoadTables())) {
  304         printf("ACPI: table load failed: %s\n", AcpiFormatException(error));
  305         AcpiTerminate();
  306         return_VALUE (error);
  307     }
  308 
  309     /* Set up any quirks we have for this system. */
  310     if (acpi_quirks == 0)
  311         acpi_table_quirks(&acpi_quirks);
  312 
  313     /* If the user manually set the disabled hint to 0, force-enable ACPI. */
  314     if (resource_int_value("acpi", 0, "disabled", &val) == 0 && val == 0)
  315         acpi_quirks &= ~ACPI_Q_BROKEN;
  316     if (acpi_quirks & ACPI_Q_BROKEN) {
  317         printf("ACPI disabled by blacklist.  Contact your BIOS vendor.\n");
  318         AcpiTerminate();
  319         return_VALUE (AE_ERROR);
  320     }
  321 
  322     return_VALUE (AE_OK);
  323 }
  324 
  325 /*
  326  * Detect ACPI, perform early initialisation
  327  */
  328 static void
  329 acpi_identify(driver_t *driver, device_t parent)
  330 {
  331     device_t    child;
  332 
  333     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  334 
  335     if (!cold)
  336         return_VOID;
  337 
  338     /* Check that we haven't been disabled with a hint. */
  339     if (resource_disabled("acpi", 0))
  340         return_VOID;
  341 
  342     /* Make sure we're not being doubly invoked. */
  343     if (device_find_child(parent, "acpi", 0) != NULL)
  344         return_VOID;
  345 
  346     /* Initialize ACPI-CA. */
  347     if (ACPI_FAILURE(acpi_Startup()))
  348         return_VOID;
  349 
  350     snprintf(acpi_ca_version, sizeof(acpi_ca_version), "%#x", ACPI_CA_VERSION);
  351 
  352     /* Attach the actual ACPI device. */
  353     if ((child = BUS_ADD_CHILD(parent, 0, "acpi", 0)) == NULL) {
  354         device_printf(parent, "device_identify failed\n");
  355         return_VOID;
  356     }
  357 }
  358 
  359 /*
  360  * Fetch some descriptive data from ACPI to put in our attach message.
  361  */
  362 static int
  363 acpi_probe(device_t dev)
  364 {
  365     ACPI_TABLE_HEADER   th;
  366     char                buf[20];
  367     int                 error;
  368     struct sbuf         sb;
  369     ACPI_STATUS         status;
  370 
  371     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  372 
  373     if (power_pm_get_type() != POWER_PM_TYPE_NONE &&
  374         power_pm_get_type() != POWER_PM_TYPE_ACPI) {
  375         device_printf(dev, "probe failed, other PM system enabled.\n");
  376         return_VALUE (ENXIO);
  377     }
  378 
  379     if (ACPI_FAILURE(status = AcpiGetTableHeader(ACPI_TABLE_XSDT, 1, &th))) {
  380         device_printf(dev, "couldn't get XSDT header: %s\n",
  381                       AcpiFormatException(status));
  382         error = ENXIO;
  383     } else {
  384         sbuf_new(&sb, buf, sizeof(buf), SBUF_FIXEDLEN);
  385         sbuf_bcat(&sb, th.OemId, 6);
  386         sbuf_trim(&sb);
  387         sbuf_putc(&sb, ' ');
  388         sbuf_bcat(&sb, th.OemTableId, 8);
  389         sbuf_trim(&sb);
  390         sbuf_finish(&sb);
  391         device_set_desc_copy(dev, sbuf_data(&sb));
  392         sbuf_delete(&sb);
  393         error = 0;
  394     }
  395 
  396     return_VALUE (error);
  397 }
  398 
  399 static int
  400 acpi_attach(device_t dev)
  401 {
  402     struct acpi_softc   *sc;
  403     ACPI_STATUS         status;
  404     int                 error, state;
  405     UINT32              flags;
  406     UINT8               TypeA, TypeB;
  407     char                *env;
  408 
  409     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  410 
  411     sc = device_get_softc(dev);
  412     sc->acpi_dev = dev;
  413 
  414     /* Initialize resource manager. */
  415     acpi_rman_io.rm_type = RMAN_ARRAY;
  416     acpi_rman_io.rm_start = 0;
  417     acpi_rman_io.rm_end = 0xffff;
  418     acpi_rman_io.rm_descr = "I/O ports";
  419     if (rman_init(&acpi_rman_io) != 0)
  420         panic("acpi rman_init IO ports failed");
  421     acpi_rman_mem.rm_type = RMAN_ARRAY;
  422     acpi_rman_mem.rm_start = 0;
  423     acpi_rman_mem.rm_end = ~0ul;
  424     acpi_rman_mem.rm_descr = "I/O memory addresses";
  425     if (rman_init(&acpi_rman_mem) != 0)
  426         panic("acpi rman_init memory failed");
  427 
  428     /* Install the default address space handlers. */
  429     error = ENXIO;
  430     status = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
  431                 ACPI_ADR_SPACE_SYSTEM_MEMORY, ACPI_DEFAULT_HANDLER, NULL, NULL);
  432     if (ACPI_FAILURE(status)) {
  433         device_printf(dev, "Could not initialise SystemMemory handler: %s\n",
  434                       AcpiFormatException(status));
  435         goto out;
  436     }
  437     status = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
  438                 ACPI_ADR_SPACE_SYSTEM_IO, ACPI_DEFAULT_HANDLER, NULL, NULL);
  439     if (ACPI_FAILURE(status)) {
  440         device_printf(dev, "Could not initialise SystemIO handler: %s\n",
  441                       AcpiFormatException(status));
  442         goto out;
  443     }
  444     status = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
  445                 ACPI_ADR_SPACE_PCI_CONFIG, ACPI_DEFAULT_HANDLER, NULL, NULL);
  446     if (ACPI_FAILURE(status)) {
  447         device_printf(dev, "could not initialise PciConfig handler: %s\n",
  448                       AcpiFormatException(status));
  449         goto out;
  450     }
  451 
  452     /*
  453      * Note that some systems (specifically, those with namespace evaluation
  454      * issues that require the avoidance of parts of the namespace) must
  455      * avoid running _INI and _STA on everything, as well as dodging the final
  456      * object init pass.
  457      *
  458      * For these devices, we set ACPI_NO_DEVICE_INIT and ACPI_NO_OBJECT_INIT).
  459      *
  460      * XXX We should arrange for the object init pass after we have attached
  461      *     all our child devices, but on many systems it works here.
  462      */
  463     flags = 0;
  464     if (testenv("debug.acpi.avoid"))
  465         flags = ACPI_NO_DEVICE_INIT | ACPI_NO_OBJECT_INIT;
  466 
  467     /* Bring the hardware and basic handlers online. */
  468     if (ACPI_FAILURE(status = AcpiEnableSubsystem(flags))) {
  469         device_printf(dev, "Could not enable ACPI: %s\n",
  470                       AcpiFormatException(status));
  471         goto out;
  472     }
  473 
  474     /*
  475      * Call the ECDT probe function to provide EC functionality before
  476      * the namespace has been evaluated.
  477      */
  478     acpi_ec_ecdt_probe(dev);
  479 
  480     /* Bring device objects and regions online. */
  481     if (ACPI_FAILURE(status = AcpiInitializeObjects(flags))) {
  482         device_printf(dev, "Could not initialize ACPI objects: %s\n",
  483                       AcpiFormatException(status));
  484         goto out;
  485     }
  486 
  487     /*
  488      * Setup our sysctl tree.
  489      *
  490      * XXX: This doesn't check to make sure that none of these fail.
  491      */
  492     sysctl_ctx_init(&sc->acpi_sysctl_ctx);
  493     sc->acpi_sysctl_tree = SYSCTL_ADD_NODE(&sc->acpi_sysctl_ctx,
  494                                SYSCTL_STATIC_CHILDREN(_hw), OID_AUTO,
  495                                device_get_name(dev), CTLFLAG_RD, 0, "");
  496     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  497         OID_AUTO, "supported_sleep_state", CTLTYPE_STRING | CTLFLAG_RD,
  498         0, 0, acpi_supported_sleep_state_sysctl, "A", "");
  499     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  500         OID_AUTO, "power_button_state", CTLTYPE_STRING | CTLFLAG_RW,
  501         &sc->acpi_power_button_sx, 0, acpi_sleep_state_sysctl, "A", "");
  502     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  503         OID_AUTO, "sleep_button_state", CTLTYPE_STRING | CTLFLAG_RW,
  504         &sc->acpi_sleep_button_sx, 0, acpi_sleep_state_sysctl, "A", "");
  505     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  506         OID_AUTO, "lid_switch_state", CTLTYPE_STRING | CTLFLAG_RW,
  507         &sc->acpi_lid_switch_sx, 0, acpi_sleep_state_sysctl, "A", "");
  508     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  509         OID_AUTO, "standby_state", CTLTYPE_STRING | CTLFLAG_RW,
  510         &sc->acpi_standby_sx, 0, acpi_sleep_state_sysctl, "A", "");
  511     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  512         OID_AUTO, "suspend_state", CTLTYPE_STRING | CTLFLAG_RW,
  513         &sc->acpi_suspend_sx, 0, acpi_sleep_state_sysctl, "A", "");
  514     SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  515         OID_AUTO, "sleep_delay", CTLFLAG_RD | CTLFLAG_RW,
  516         &sc->acpi_sleep_delay, 0, "sleep delay");
  517     SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  518         OID_AUTO, "s4bios", CTLFLAG_RD | CTLFLAG_RW,
  519         &sc->acpi_s4bios, 0, "S4BIOS mode");
  520     SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
  521         OID_AUTO, "verbose", CTLFLAG_RD | CTLFLAG_RW,
  522         &sc->acpi_verbose, 0, "verbose mode");
  523 
  524     /*
  525      * Default to 1 second before sleeping to give some machines time to
  526      * stabilize.
  527      */
  528     sc->acpi_sleep_delay = 1;
  529     if (bootverbose)
  530         sc->acpi_verbose = 1;
  531     if ((env = getenv("hw.acpi.verbose")) != NULL) {
  532         if (strcmp(env, "") != 0)
  533             sc->acpi_verbose = 1;
  534         freeenv(env);
  535     }
  536 
  537     /* Only enable S4BIOS by default if the FACS says it is available. */
  538     if (AcpiGbl_FACS->S4Bios_f != 0)
  539         sc->acpi_s4bios = 1;
  540 
  541     /*
  542      * Dispatch the default sleep state to devices.  The lid switch is set
  543      * to NONE by default to avoid surprising users.
  544      */
  545     sc->acpi_power_button_sx = ACPI_STATE_S5;
  546     sc->acpi_lid_switch_sx = ACPI_S_STATES_MAX + 1;
  547     sc->acpi_standby_sx = ACPI_STATE_S1;
  548     sc->acpi_suspend_sx = ACPI_STATE_S3;
  549 
  550     /* Pick the first valid sleep state for the sleep button default. */
  551     sc->acpi_sleep_button_sx = ACPI_S_STATES_MAX + 1;
  552     for (state = ACPI_STATE_S1; state < ACPI_STATE_S5; state++)
  553         if (ACPI_SUCCESS(AcpiGetSleepTypeData(state, &TypeA, &TypeB))) {
  554             sc->acpi_sleep_button_sx = state;
  555             break;
  556         }
  557 
  558     acpi_enable_fixed_events(sc);
  559 
  560     /*
  561      * Scan the namespace and attach/initialise children.
  562      */
  563 
  564     /* Register our shutdown handler. */
  565     EVENTHANDLER_REGISTER(shutdown_final, acpi_shutdown_final, sc,
  566         SHUTDOWN_PRI_LAST);
  567 
  568     /*
  569      * Register our acpi event handlers.
  570      * XXX should be configurable eg. via userland policy manager.
  571      */
  572     EVENTHANDLER_REGISTER(acpi_sleep_event, acpi_system_eventhandler_sleep,
  573         sc, ACPI_EVENT_PRI_LAST);
  574     EVENTHANDLER_REGISTER(acpi_wakeup_event, acpi_system_eventhandler_wakeup,
  575         sc, ACPI_EVENT_PRI_LAST);
  576 
  577     /* Flag our initial states. */
  578     sc->acpi_enabled = 1;
  579     sc->acpi_sstate = ACPI_STATE_S0;
  580     sc->acpi_sleep_disabled = 0;
  581 
  582     /* Create the control device */
  583     sc->acpi_dev_t = make_dev(&acpi_cdevsw, 0, UID_ROOT, GID_WHEEL, 0644,
  584                               "acpi");
  585     sc->acpi_dev_t->si_drv1 = sc;
  586 
  587     if ((error = acpi_machdep_init(dev)))
  588         goto out;
  589 
  590     /* Register ACPI again to pass the correct argument of pm_func. */
  591     power_pm_register(POWER_PM_TYPE_ACPI, acpi_pm_func, sc);
  592 
  593     if (!acpi_disabled("bus"))
  594         acpi_probe_children(dev);
  595 
  596     error = 0;
  597 
  598  out:
  599     return_VALUE (error);
  600 }
  601 
  602 static int
  603 acpi_suspend(device_t dev)
  604 {
  605     device_t child, *devlist;
  606     int error, i, numdevs, pstate;
  607 
  608     GIANT_REQUIRED;
  609 
  610     /* First give child devices a chance to suspend. */
  611     error = bus_generic_suspend(dev);
  612     if (error)
  613         return (error);
  614 
  615     /*
  616      * Now, set them into the appropriate power state, usually D3.  If the
  617      * device has an _SxD method for the next sleep state, use that power
  618      * state instead.
  619      */
  620     device_get_children(dev, &devlist, &numdevs);
  621     for (i = 0; i < numdevs; i++) {
  622         /* If the device is not attached, we've powered it down elsewhere. */
  623         child = devlist[i];
  624         if (!device_is_attached(child))
  625             continue;
  626 
  627         /*
  628          * Default to D3 for all sleep states.  The _SxD method is optional
  629          * so set the powerstate even if it's absent.
  630          */
  631         pstate = PCI_POWERSTATE_D3;
  632         error = acpi_device_pwr_for_sleep(device_get_parent(child),
  633             child, &pstate);
  634         if ((error == 0 || error == ESRCH) && acpi_do_powerstate)
  635             pci_set_powerstate(child, pstate);
  636     }
  637     free(devlist, M_TEMP);
  638     error = 0;
  639 
  640     return (error);
  641 }
  642 
  643 static int
  644 acpi_resume(device_t dev)
  645 {
  646     ACPI_HANDLE handle;
  647     int i, numdevs;
  648     device_t child, *devlist;
  649 
  650     GIANT_REQUIRED;
  651 
  652     /*
  653      * Put all devices in D0 before resuming them.  Call _S0D on each one
  654      * since some systems expect this.
  655      */
  656     device_get_children(dev, &devlist, &numdevs);
  657     for (i = 0; i < numdevs; i++) {
  658         child = devlist[i];
  659         handle = acpi_get_handle(child);
  660         if (handle)
  661             AcpiEvaluateObject(handle, "_S0D", NULL, NULL);
  662         if (device_is_attached(child) && acpi_do_powerstate)
  663             pci_set_powerstate(child, PCI_POWERSTATE_D0);
  664     }
  665     free(devlist, M_TEMP);
  666 
  667     return (bus_generic_resume(dev));
  668 }
  669 
  670 static int
  671 acpi_shutdown(device_t dev)
  672 {
  673 
  674     GIANT_REQUIRED;
  675 
  676     /* Allow children to shutdown first. */
  677     bus_generic_shutdown(dev);
  678 
  679     /*
  680      * Enable any GPEs that are able to power-on the system (i.e., RTC).
  681      * Also, disable any that are not valid for this state (most).
  682      */
  683     acpi_wake_prep_walk(ACPI_STATE_S5);
  684 
  685     return (0);
  686 }
  687 
  688 /*
  689  * Handle a new device being added
  690  */
  691 static device_t
  692 acpi_add_child(device_t bus, int order, const char *name, int unit)
  693 {
  694     struct acpi_device  *ad;
  695     device_t            child;
  696 
  697     if ((ad = malloc(sizeof(*ad), M_ACPIDEV, M_NOWAIT | M_ZERO)) == NULL)
  698         return (NULL);
  699 
  700     resource_list_init(&ad->ad_rl);
  701 
  702     child = device_add_child_ordered(bus, order, name, unit);
  703     if (child != NULL)
  704         device_set_ivars(child, ad);
  705     else
  706         free(ad, M_ACPIDEV);
  707     return (child);
  708 }
  709 
  710 static int
  711 acpi_print_child(device_t bus, device_t child)
  712 {
  713     struct acpi_device   *adev = device_get_ivars(child);
  714     struct resource_list *rl = &adev->ad_rl;
  715     int retval = 0;
  716 
  717     retval += bus_print_child_header(bus, child);
  718     retval += resource_list_print_type(rl, "port",  SYS_RES_IOPORT, "%#lx");
  719     retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
  720     retval += resource_list_print_type(rl, "irq",   SYS_RES_IRQ,    "%ld");
  721     retval += resource_list_print_type(rl, "drq",   SYS_RES_DRQ,    "%ld");
  722     if (device_get_flags(child))
  723         retval += printf(" flags %#x", device_get_flags(child));
  724     retval += bus_print_child_footer(bus, child);
  725 
  726     return (retval);
  727 }
  728 
  729 /*
  730  * If this device is an ACPI child but no one claimed it, attempt
  731  * to power it off.  We'll power it back up when a driver is added.
  732  *
  733  * XXX Disabled for now since many necessary devices (like fdc and
  734  * ATA) don't claim the devices we created for them but still expect
  735  * them to be powered up.
  736  */
  737 static void
  738 acpi_probe_nomatch(device_t bus, device_t child)
  739 {
  740 
  741     /* pci_set_powerstate(child, PCI_POWERSTATE_D3); */
  742 }
  743 
  744 /*
  745  * If a new driver has a chance to probe a child, first power it up.
  746  *
  747  * XXX Disabled for now (see acpi_probe_nomatch for details).
  748  */
  749 static void
  750 acpi_driver_added(device_t dev, driver_t *driver)
  751 {
  752     device_t child, *devlist;
  753     int i, numdevs;
  754 
  755     DEVICE_IDENTIFY(driver, dev);
  756     device_get_children(dev, &devlist, &numdevs);
  757     for (i = 0; i < numdevs; i++) {
  758         child = devlist[i];
  759         if (device_get_state(child) == DS_NOTPRESENT) {
  760             /* pci_set_powerstate(child, PCI_POWERSTATE_D0); */
  761             if (device_probe_and_attach(child) != 0)
  762                 ; /* pci_set_powerstate(child, PCI_POWERSTATE_D3); */
  763         }
  764     }
  765     free(devlist, M_TEMP);
  766 }
  767 
  768 /* Location hint for devctl(8) */
  769 static int
  770 acpi_child_location_str_method(device_t cbdev, device_t child, char *buf,
  771     size_t buflen)
  772 {
  773     struct acpi_device *dinfo = device_get_ivars(child);
  774 
  775     if (dinfo->ad_handle)
  776         snprintf(buf, buflen, "handle=%s", acpi_name(dinfo->ad_handle));
  777     else
  778         snprintf(buf, buflen, "unknown");
  779     return (0);
  780 }
  781 
  782 /* PnP information for devctl(8) */
  783 static int
  784 acpi_child_pnpinfo_str_method(device_t cbdev, device_t child, char *buf,
  785     size_t buflen)
  786 {
  787     ACPI_BUFFER adbuf = {ACPI_ALLOCATE_BUFFER, NULL}; 
  788     ACPI_DEVICE_INFO *adinfo;
  789     struct acpi_device *dinfo = device_get_ivars(child);
  790     char *end;
  791     int error;
  792 
  793     error = AcpiGetObjectInfo(dinfo->ad_handle, &adbuf);
  794     adinfo = (ACPI_DEVICE_INFO *) adbuf.Pointer;
  795     if (error)
  796         snprintf(buf, buflen, "unknown");
  797     else
  798         snprintf(buf, buflen, "_HID=%s _UID=%lu",
  799                  (adinfo->Valid & ACPI_VALID_HID) ?
  800                  adinfo->HardwareId.Value : "none",
  801                  (adinfo->Valid & ACPI_VALID_UID) ?
  802                  strtoul(adinfo->UniqueId.Value, &end, 10) : 0);
  803     if (adinfo)
  804         AcpiOsFree(adinfo);
  805 
  806     return (0);
  807 }
  808 
  809 /*
  810  * Handle per-device ivars
  811  */
  812 static int
  813 acpi_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
  814 {
  815     struct acpi_device  *ad;
  816 
  817     if ((ad = device_get_ivars(child)) == NULL) {
  818         printf("device has no ivars\n");
  819         return (ENOENT);
  820     }
  821 
  822     /* ACPI and ISA compatibility ivars */
  823     switch(index) {
  824     case ACPI_IVAR_HANDLE:
  825         *(ACPI_HANDLE *)result = ad->ad_handle;
  826         break;
  827     case ACPI_IVAR_MAGIC:
  828         *(int *)result = ad->ad_magic;
  829         break;
  830     case ACPI_IVAR_PRIVATE:
  831         *(void **)result = ad->ad_private;
  832         break;
  833     case ACPI_IVAR_FLAGS:
  834         *(int *)result = ad->ad_flags;
  835         break;
  836     case ISA_IVAR_VENDORID:
  837     case ISA_IVAR_SERIAL:
  838     case ISA_IVAR_COMPATID:
  839         *(int *)result = -1;
  840         break;
  841     case ISA_IVAR_LOGICALID:
  842         *(int *)result = acpi_isa_get_logicalid(child);
  843         break;
  844     default:
  845         return (ENOENT);
  846     }
  847 
  848     return (0);
  849 }
  850 
  851 static int
  852 acpi_write_ivar(device_t dev, device_t child, int index, uintptr_t value)
  853 {
  854     struct acpi_device  *ad;
  855 
  856     if ((ad = device_get_ivars(child)) == NULL) {
  857         printf("device has no ivars\n");
  858         return (ENOENT);
  859     }
  860 
  861     switch(index) {
  862     case ACPI_IVAR_HANDLE:
  863         ad->ad_handle = (ACPI_HANDLE)value;
  864         break;
  865     case ACPI_IVAR_MAGIC:
  866         ad->ad_magic = (int)value;
  867         break;
  868     case ACPI_IVAR_PRIVATE:
  869         ad->ad_private = (void *)value;
  870         break;
  871     case ACPI_IVAR_FLAGS:
  872         ad->ad_flags = (int)value;
  873         break;
  874     default:
  875         panic("bad ivar write request (%d)", index);
  876         return (ENOENT);
  877     }
  878 
  879     return (0);
  880 }
  881 
  882 /*
  883  * Handle child resource allocation/removal
  884  */
  885 static struct resource_list *
  886 acpi_get_rlist(device_t dev, device_t child)
  887 {
  888     struct acpi_device          *ad;
  889 
  890     ad = device_get_ivars(child);
  891     return (&ad->ad_rl);
  892 }
  893 
  894 /*
  895  * Pre-allocate/manage all memory and IO resources.  Since rman can't handle
  896  * duplicates, we merge any in the sysresource attach routine.
  897  */
  898 static int
  899 acpi_sysres_alloc(device_t dev)
  900 {
  901     struct resource *res;
  902     struct resource_list *rl;
  903     struct resource_list_entry *rle;
  904     struct rman *rm;
  905 
  906     rl = BUS_GET_RESOURCE_LIST(device_get_parent(dev), dev);
  907     STAILQ_FOREACH(rle, rl, link) {
  908         if (rle->res != NULL) {
  909             device_printf(dev, "duplicate resource for %lx\n", rle->start);
  910             continue;
  911         }
  912 
  913         /* Only memory and IO resources are valid here. */
  914         switch (rle->type) {
  915         case SYS_RES_IOPORT:
  916             rm = &acpi_rman_io;
  917             break;
  918         case SYS_RES_MEMORY:
  919             rm = &acpi_rman_mem;
  920             break;
  921         default:
  922             continue;
  923         }
  924 
  925         /* Pre-allocate resource and add to our rman pool. */
  926         res = BUS_ALLOC_RESOURCE(device_get_parent(dev), dev, rle->type,
  927             &rle->rid, rle->start, rle->start + rle->count - 1, rle->count, 0);
  928         if (res != NULL) {
  929             rman_manage_region(rm, rman_get_start(res), rman_get_end(res));
  930             rle->res = res;
  931         } else
  932             device_printf(dev, "reservation of %lx, %lx (%d) failed\n",
  933                 rle->start, rle->count, rle->type);
  934     }
  935     return (0);
  936 }
  937 
  938 /* Find if we manage a given resource. */
  939 static struct resource_list_entry *
  940 acpi_sysres_find(device_t dev, int type, u_long addr)
  941 {
  942     struct resource_list *rl;
  943     struct resource_list_entry *rle;
  944 
  945     ACPI_SERIAL_ASSERT(acpi);
  946 
  947     /* We only consider IO and memory resources for our pool. */
  948     rle = NULL;
  949     if (type != SYS_RES_IOPORT && type != SYS_RES_MEMORY)
  950         goto out;
  951 
  952     rl = BUS_GET_RESOURCE_LIST(device_get_parent(dev), dev);
  953     STAILQ_FOREACH(rle, rl, link) {
  954         if (type == rle->type && addr >= rle->start &&
  955             addr < rle->start + rle->count)
  956             break;
  957     }
  958 
  959 out:
  960     return (rle);
  961 }
  962 
  963 static struct resource *
  964 acpi_alloc_resource(device_t bus, device_t child, int type, int *rid,
  965     u_long start, u_long end, u_long count, u_int flags)
  966 {
  967     ACPI_RESOURCE ares;
  968     struct acpi_device *ad = device_get_ivars(child);
  969     struct resource_list *rl = &ad->ad_rl;
  970     struct resource_list_entry *rle;
  971     struct resource *res;
  972     struct rman *rm;
  973 
  974     res = NULL;
  975     ACPI_SERIAL_BEGIN(acpi);
  976 
  977     /*
  978      * If this is an allocation of the "default" range for a given RID, and
  979      * we know what the resources for this device are (i.e., they're on the
  980      * child's resource list), use those start/end values.
  981      */
  982     if (bus == device_get_parent(child) && start == 0UL && end == ~0UL) {
  983         rle = resource_list_find(rl, type, *rid);
  984         if (rle == NULL)
  985             goto out;
  986         start = rle->start;
  987         end = rle->end;
  988         count = rle->count;
  989     }
  990 
  991     /* If we don't manage this address, pass the request up to the parent. */
  992     rle = acpi_sysres_find(bus, type, start);
  993     if (rle == NULL) {
  994         res = BUS_ALLOC_RESOURCE(device_get_parent(bus), child, type, rid,
  995             start, end, count, flags);
  996     } else {
  997 
  998         /* We only handle memory and IO resources through rman. */
  999         switch (type) {
 1000         case SYS_RES_IOPORT:
 1001             rm = &acpi_rman_io;
 1002             break;
 1003         case SYS_RES_MEMORY:
 1004             rm = &acpi_rman_mem;
 1005             break;
 1006         default:
 1007             panic("acpi_alloc_resource: invalid res type %d", type);
 1008         }
 1009 
 1010         /* If we do know it, allocate it from the local pool. */
 1011         res = rman_reserve_resource(rm, start, end, count, flags & ~RF_ACTIVE,
 1012             child);
 1013         if (res == NULL)
 1014             goto out;
 1015 
 1016         /* Copy the bus tag and handle from the pre-allocated resource. */
 1017         rman_set_bustag(res, rman_get_bustag(rle->res));
 1018         rman_set_bushandle(res, rman_get_start(res));
 1019 
 1020         /* If requested, activate the resource using the parent's method. */
 1021         if (flags & RF_ACTIVE)
 1022             if (bus_activate_resource(child, type, *rid, res) != 0) {
 1023                 rman_release_resource(res);
 1024                 res = NULL;
 1025                 goto out;
 1026             }
 1027     }
 1028 
 1029     if (res != NULL && device_get_parent(child) == bus)
 1030         switch (type) {
 1031         case SYS_RES_IRQ:
 1032             /*
 1033              * Since bus_config_intr() takes immediate effect, we cannot
 1034              * configure the interrupt associated with a device when we
 1035              * parse the resources but have to defer it until a driver
 1036              * actually allocates the interrupt via bus_alloc_resource().
 1037              *
 1038              * XXX: Should we handle the lookup failing?
 1039              */
 1040             if (ACPI_SUCCESS(acpi_lookup_irq_resource(child, *rid, res, &ares)))
 1041                 acpi_config_intr(child, &ares);
 1042             break;
 1043         }
 1044 
 1045 out:
 1046     ACPI_SERIAL_END(acpi);
 1047     return (res);
 1048 }
 1049 
 1050 static int
 1051 acpi_release_resource(device_t bus, device_t child, int type, int rid,
 1052     struct resource *r)
 1053 {
 1054     int ret;
 1055 
 1056     ACPI_SERIAL_BEGIN(acpi);
 1057 
 1058     /*
 1059      * If we know about this address, deactivate it and release it to the
 1060      * local pool.  If we don't, pass this request up to the parent.
 1061      */
 1062     if (acpi_sysres_find(bus, type, rman_get_start(r)) == NULL) {
 1063         if (rman_get_flags(r) & RF_ACTIVE) {
 1064             ret = bus_deactivate_resource(child, type, rid, r);
 1065             if (ret != 0)
 1066                 goto out;
 1067         }
 1068         ret = rman_release_resource(r);
 1069     } else
 1070         ret = BUS_RELEASE_RESOURCE(device_get_parent(bus), child, type, rid, r);
 1071 
 1072 out:
 1073     ACPI_SERIAL_END(acpi);
 1074     return (ret);
 1075 }
 1076 
 1077 static void
 1078 acpi_delete_resource(device_t bus, device_t child, int type, int rid)
 1079 {
 1080     struct resource_list *rl;
 1081 
 1082     rl = acpi_get_rlist(bus, child);
 1083     resource_list_delete(rl, type, rid);
 1084 }
 1085 
 1086 /* Allocate an IO port or memory resource, given its GAS. */
 1087 int
 1088 acpi_bus_alloc_gas(device_t dev, int *type, int *rid, ACPI_GENERIC_ADDRESS *gas,
 1089     struct resource **res)
 1090 {
 1091     int error, res_type;
 1092 
 1093     error = ENOMEM;
 1094     if (type == NULL || rid == NULL || gas == NULL || res == NULL)
 1095         return (EINVAL);
 1096 
 1097     /* We only support memory and IO spaces. */
 1098     switch (gas->AddressSpaceId) {
 1099     case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 1100         res_type = SYS_RES_MEMORY;
 1101         break;
 1102     case ACPI_ADR_SPACE_SYSTEM_IO:
 1103         res_type = SYS_RES_IOPORT;
 1104         break;
 1105     default:
 1106         return (EOPNOTSUPP);
 1107     }
 1108 
 1109     /*
 1110      * If the register width is less than 8, assume the BIOS author means
 1111      * it is a bit field and just allocate a byte.
 1112      */
 1113     if (gas->RegisterBitWidth && gas->RegisterBitWidth < 8)
 1114         gas->RegisterBitWidth = 8;
 1115 
 1116     /* Validate the address after we're sure we support the space. */
 1117     if (!ACPI_VALID_ADDRESS(gas->Address) || gas->RegisterBitWidth == 0)
 1118         return (EINVAL);
 1119 
 1120     bus_set_resource(dev, res_type, *rid, gas->Address,
 1121         gas->RegisterBitWidth / 8);
 1122     *res = bus_alloc_resource_any(dev, res_type, rid, RF_ACTIVE);
 1123     if (*res != NULL) {
 1124         *type = res_type;
 1125         error = 0;
 1126     } else
 1127         bus_delete_resource(dev, res_type, *rid);
 1128 
 1129     return (error);
 1130 }
 1131 
 1132 /* Probe _HID and _CID for compatible ISA PNP ids. */
 1133 static uint32_t
 1134 acpi_isa_get_logicalid(device_t dev)
 1135 {
 1136     ACPI_DEVICE_INFO    *devinfo;
 1137     ACPI_BUFFER         buf;
 1138     ACPI_HANDLE         h;
 1139     ACPI_STATUS         error;
 1140     u_int32_t           pnpid;
 1141 
 1142     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 1143 
 1144     pnpid = 0;
 1145     buf.Pointer = NULL;
 1146     buf.Length = ACPI_ALLOCATE_BUFFER;
 1147 
 1148     /* Fetch and validate the HID. */
 1149     if ((h = acpi_get_handle(dev)) == NULL)
 1150         goto out;
 1151     error = AcpiGetObjectInfo(h, &buf);
 1152     if (ACPI_FAILURE(error))
 1153         goto out;
 1154     devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;
 1155 
 1156     if ((devinfo->Valid & ACPI_VALID_HID) != 0)
 1157         pnpid = PNP_EISAID(devinfo->HardwareId.Value);
 1158 
 1159 out:
 1160     if (buf.Pointer != NULL)
 1161         AcpiOsFree(buf.Pointer);
 1162     return_VALUE (pnpid);
 1163 }
 1164 
 1165 static int
 1166 acpi_isa_get_compatid(device_t dev, uint32_t *cids, int count)
 1167 {
 1168     ACPI_DEVICE_INFO    *devinfo;
 1169     ACPI_BUFFER         buf;
 1170     ACPI_HANDLE         h;
 1171     ACPI_STATUS         error;
 1172     uint32_t            *pnpid;
 1173     int                 valid, i;
 1174 
 1175     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 1176 
 1177     pnpid = cids;
 1178     valid = 0;
 1179     buf.Pointer = NULL;
 1180     buf.Length = ACPI_ALLOCATE_BUFFER;
 1181 
 1182     /* Fetch and validate the CID */
 1183     if ((h = acpi_get_handle(dev)) == NULL)
 1184         goto out;
 1185     error = AcpiGetObjectInfo(h, &buf);
 1186     if (ACPI_FAILURE(error))
 1187         goto out;
 1188     devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;
 1189     if ((devinfo->Valid & ACPI_VALID_CID) == 0)
 1190         goto out;
 1191 
 1192     if (devinfo->CompatibilityId.Count < count)
 1193         count = devinfo->CompatibilityId.Count;
 1194     for (i = 0; i < count; i++) {
 1195         if (strncmp(devinfo->CompatibilityId.Id[i].Value, "PNP", 3) != 0)
 1196             continue;
 1197         *pnpid++ = PNP_EISAID(devinfo->CompatibilityId.Id[i].Value);
 1198         valid++;
 1199     }
 1200 
 1201 out:
 1202     if (buf.Pointer != NULL)
 1203         AcpiOsFree(buf.Pointer);
 1204     return_VALUE (valid);
 1205 }
 1206 
 1207 static char *
 1208 acpi_device_id_probe(device_t bus, device_t dev, char **ids) 
 1209 {
 1210     ACPI_HANDLE h;
 1211     int i;
 1212 
 1213     h = acpi_get_handle(dev);
 1214     if (ids == NULL || h == NULL || acpi_get_type(dev) != ACPI_TYPE_DEVICE)
 1215         return (NULL);
 1216 
 1217     /* Try to match one of the array of IDs with a HID or CID. */
 1218     for (i = 0; ids[i] != NULL; i++) {
 1219         if (acpi_MatchHid(h, ids[i]))
 1220             return (ids[i]);
 1221     }
 1222     return (NULL);
 1223 }
 1224 
 1225 static ACPI_STATUS
 1226 acpi_device_eval_obj(device_t bus, device_t dev, ACPI_STRING pathname,
 1227     ACPI_OBJECT_LIST *parameters, ACPI_BUFFER *ret)
 1228 {
 1229     ACPI_HANDLE h;
 1230 
 1231     if (dev == NULL)
 1232         h = ACPI_ROOT_OBJECT;
 1233     else if ((h = acpi_get_handle(dev)) == NULL)
 1234         return (AE_BAD_PARAMETER);
 1235     return (AcpiEvaluateObject(h, pathname, parameters, ret));
 1236 }
 1237 
 1238 static int
 1239 acpi_device_pwr_for_sleep(device_t bus, device_t dev, int *dstate)
 1240 {
 1241     struct acpi_softc *sc;
 1242     ACPI_HANDLE handle;
 1243     ACPI_STATUS status;
 1244     char sxd[8];
 1245     int error;
 1246 
 1247     sc = device_get_softc(bus);
 1248     handle = acpi_get_handle(dev);
 1249 
 1250     /*
 1251      * XXX If we find these devices, don't try to power them down.
 1252      * The serial and IRDA ports on my T23 hang the system when
 1253      * set to D3 and it appears that such legacy devices may
 1254      * need special handling in their drivers.
 1255      */
 1256     if (handle == NULL ||
 1257         acpi_MatchHid(handle, "PNP0500") ||
 1258         acpi_MatchHid(handle, "PNP0501") ||
 1259         acpi_MatchHid(handle, "PNP0502") ||
 1260         acpi_MatchHid(handle, "PNP0510") ||
 1261         acpi_MatchHid(handle, "PNP0511"))
 1262         return (ENXIO);
 1263 
 1264     /*
 1265      * Override next state with the value from _SxD, if present.  If no
 1266      * dstate argument was provided, don't fetch the return value.
 1267      */
 1268     snprintf(sxd, sizeof(sxd), "_S%dD", sc->acpi_sstate);
 1269     if (dstate)
 1270         status = acpi_GetInteger(handle, sxd, dstate);
 1271     else
 1272         status = AcpiEvaluateObject(handle, sxd, NULL, NULL);
 1273 
 1274     switch (status) {
 1275     case AE_OK:
 1276         error = 0;
 1277         break;
 1278     case AE_NOT_FOUND:
 1279         error = ESRCH;
 1280         break;
 1281     default:
 1282         error = ENXIO;
 1283         break;
 1284     }
 1285 
 1286     return (error);
 1287 }
 1288 
 1289 /* Callback arg for our implementation of walking the namespace. */
 1290 struct acpi_device_scan_ctx {
 1291     acpi_scan_cb_t      user_fn;
 1292     void                *arg;
 1293     ACPI_HANDLE         parent;
 1294 };
 1295 
 1296 static ACPI_STATUS
 1297 acpi_device_scan_cb(ACPI_HANDLE h, UINT32 level, void *arg, void **retval)
 1298 {
 1299     struct acpi_device_scan_ctx *ctx;
 1300     device_t dev, old_dev;
 1301     ACPI_STATUS status;
 1302     ACPI_OBJECT_TYPE type;
 1303 
 1304     /*
 1305      * Skip this device if we think we'll have trouble with it or it is
 1306      * the parent where the scan began.
 1307      */
 1308     ctx = (struct acpi_device_scan_ctx *)arg;
 1309     if (acpi_avoid(h) || h == ctx->parent)
 1310         return (AE_OK);
 1311 
 1312     /* If this is not a valid device type (e.g., a method), skip it. */
 1313     if (ACPI_FAILURE(AcpiGetType(h, &type)))
 1314         return (AE_OK);
 1315     if (type != ACPI_TYPE_DEVICE && type != ACPI_TYPE_PROCESSOR &&
 1316         type != ACPI_TYPE_THERMAL && type != ACPI_TYPE_POWER)
 1317         return (AE_OK);
 1318 
 1319     /*
 1320      * Call the user function with the current device.  If it is unchanged
 1321      * afterwards, return.  Otherwise, we update the handle to the new dev.
 1322      */
 1323     old_dev = acpi_get_device(h);
 1324     dev = old_dev;
 1325     status = ctx->user_fn(h, &dev, level, ctx->arg);
 1326     if (ACPI_FAILURE(status) || old_dev == dev)
 1327         return (status);
 1328 
 1329     /* Remove the old child and its connection to the handle. */
 1330     if (old_dev != NULL) {
 1331         device_delete_child(device_get_parent(old_dev), old_dev);
 1332         AcpiDetachData(h, acpi_fake_objhandler);
 1333     }
 1334 
 1335     /* Recreate the handle association if the user created a device. */
 1336     if (dev != NULL)
 1337         AcpiAttachData(h, acpi_fake_objhandler, dev);
 1338 
 1339     return (AE_OK);
 1340 }
 1341 
 1342 static ACPI_STATUS
 1343 acpi_device_scan_children(device_t bus, device_t dev, int max_depth,
 1344     acpi_scan_cb_t user_fn, void *arg)
 1345 {
 1346     ACPI_HANDLE h;
 1347     struct acpi_device_scan_ctx ctx;
 1348 
 1349     if (acpi_disabled("children"))
 1350         return (AE_OK);
 1351 
 1352     if (dev == NULL)
 1353         h = ACPI_ROOT_OBJECT;
 1354     else if ((h = acpi_get_handle(dev)) == NULL)
 1355         return (AE_BAD_PARAMETER);
 1356     ctx.user_fn = user_fn;
 1357     ctx.arg = arg;
 1358     ctx.parent = h;
 1359     return (AcpiWalkNamespace(ACPI_TYPE_ANY, h, max_depth,
 1360         acpi_device_scan_cb, &ctx, NULL));
 1361 }
 1362 
 1363 /*
 1364  * Even though ACPI devices are not PCI, we use the PCI approach for setting
 1365  * device power states since it's close enough to ACPI.
 1366  */
 1367 static int
 1368 acpi_set_powerstate_method(device_t bus, device_t child, int state)
 1369 {
 1370     ACPI_HANDLE h;
 1371     ACPI_STATUS status;
 1372     int error;
 1373 
 1374     error = 0;
 1375     h = acpi_get_handle(child);
 1376     if (state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
 1377         return (EINVAL);
 1378     if (h == NULL)
 1379         return (0);
 1380 
 1381     /* Ignore errors if the power methods aren't present. */
 1382     status = acpi_pwr_switch_consumer(h, state);
 1383     if (ACPI_FAILURE(status) && status != AE_NOT_FOUND
 1384         && status != AE_BAD_PARAMETER)
 1385         device_printf(bus, "failed to set ACPI power state D%d on %s: %s\n",
 1386             state, acpi_name(h), AcpiFormatException(status));
 1387 
 1388     return (error);
 1389 }
 1390 
 1391 static int
 1392 acpi_isa_pnp_probe(device_t bus, device_t child, struct isa_pnp_id *ids)
 1393 {
 1394     int                 result, cid_count, i;
 1395     uint32_t            lid, cids[8];
 1396 
 1397     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 1398 
 1399     /*
 1400      * ISA-style drivers attached to ACPI may persist and
 1401      * probe manually if we return ENOENT.  We never want
 1402      * that to happen, so don't ever return it.
 1403      */
 1404     result = ENXIO;
 1405 
 1406     /* Scan the supplied IDs for a match */
 1407     lid = acpi_isa_get_logicalid(child);
 1408     cid_count = acpi_isa_get_compatid(child, cids, 8);
 1409     while (ids && ids->ip_id) {
 1410         if (lid == ids->ip_id) {
 1411             result = 0;
 1412             goto out;
 1413         }
 1414         for (i = 0; i < cid_count; i++) {
 1415             if (cids[i] == ids->ip_id) {
 1416                 result = 0;
 1417                 goto out;
 1418             }
 1419         }
 1420         ids++;
 1421     }
 1422 
 1423  out:
 1424     if (result == 0 && ids->ip_desc)
 1425         device_set_desc(child, ids->ip_desc);
 1426 
 1427     return_VALUE (result);
 1428 }
 1429 
 1430 /*
 1431  * Scan all of the ACPI namespace and attach child devices.
 1432  *
 1433  * We should only expect to find devices in the \_PR, \_TZ, \_SI, and
 1434  * \_SB scopes, and \_PR and \_TZ became obsolete in the ACPI 2.0 spec.
 1435  * However, in violation of the spec, some systems place their PCI link
 1436  * devices in \, so we have to walk the whole namespace.  We check the
 1437  * type of namespace nodes, so this should be ok.
 1438  */
 1439 static void
 1440 acpi_probe_children(device_t bus)
 1441 {
 1442 
 1443     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 1444 
 1445     /*
 1446      * Scan the namespace and insert placeholders for all the devices that
 1447      * we find.  We also probe/attach any early devices.
 1448      *
 1449      * Note that we use AcpiWalkNamespace rather than AcpiGetDevices because
 1450      * we want to create nodes for all devices, not just those that are
 1451      * currently present. (This assumes that we don't want to create/remove
 1452      * devices as they appear, which might be smarter.)
 1453      */
 1454     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "namespace scan\n"));
 1455     AcpiWalkNamespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, 100, acpi_probe_child,
 1456         bus, NULL);
 1457 
 1458     /* Pre-allocate resources for our rman from any sysresource devices. */
 1459     acpi_sysres_alloc(bus);
 1460 
 1461     /* Create any static children by calling device identify methods. */
 1462     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "device identify routines\n"));
 1463     bus_generic_probe(bus);
 1464 
 1465     /* Probe/attach all children, created staticly and from the namespace. */
 1466     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "first bus_generic_attach\n"));
 1467     bus_generic_attach(bus);
 1468 
 1469     /*
 1470      * Some of these children may have attached others as part of their attach
 1471      * process (eg. the root PCI bus driver), so rescan.
 1472      */
 1473     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "second bus_generic_attach\n"));
 1474     bus_generic_attach(bus);
 1475 
 1476     /* Attach wake sysctls. */
 1477     acpi_wake_sysctl_walk(bus);
 1478 
 1479     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "done attaching children\n"));
 1480     return_VOID;
 1481 }
 1482 
 1483 /*
 1484  * Determine the probe order for a given device and return non-zero if it
 1485  * should be attached immediately.
 1486  */
 1487 static int
 1488 acpi_probe_order(ACPI_HANDLE handle, int *order)
 1489 {
 1490     int ret;
 1491 
 1492     /*
 1493      * 1. I/O port and memory system resource holders
 1494      * 2. Embedded controllers (to handle early accesses)
 1495      * 3. PCI Link Devices
 1496      */
 1497     ret = 0;
 1498     if (acpi_MatchHid(handle, "PNP0C01") || acpi_MatchHid(handle, "PNP0C02")) {
 1499         *order = 1;
 1500         ret = 1;
 1501     } else if (acpi_MatchHid(handle, "PNP0C09")) {
 1502         *order = 2;
 1503         ret = 1;
 1504     } else if (acpi_MatchHid(handle, "PNP0C0F")) {
 1505         *order = 3;
 1506         ret = 1;
 1507     }
 1508 
 1509     return (ret);
 1510 }
 1511 
 1512 /*
 1513  * Evaluate a child device and determine whether we might attach a device to
 1514  * it.
 1515  */
 1516 static ACPI_STATUS
 1517 acpi_probe_child(ACPI_HANDLE handle, UINT32 level, void *context, void **status)
 1518 {
 1519     ACPI_OBJECT_TYPE type;
 1520     device_t bus, child;
 1521     int order, probe_now;
 1522     char *handle_str, **search;
 1523     static char *scopes[] = {"\\_PR_", "\\_TZ_", "\\_SI_", "\\_SB_", NULL};
 1524 
 1525     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 1526 
 1527     /* Skip this device if we think we'll have trouble with it. */
 1528     if (acpi_avoid(handle))
 1529         return_ACPI_STATUS (AE_OK);
 1530 
 1531     bus = (device_t)context;
 1532     if (ACPI_SUCCESS(AcpiGetType(handle, &type))) {
 1533         switch (type) {
 1534         case ACPI_TYPE_DEVICE:
 1535         case ACPI_TYPE_PROCESSOR:
 1536         case ACPI_TYPE_THERMAL:
 1537         case ACPI_TYPE_POWER:
 1538             if (acpi_disabled("children"))
 1539                 break;
 1540 
 1541             /*
 1542              * Since we scan from \, be sure to skip system scope objects.
 1543              * At least \_SB and \_TZ are detected as devices (ACPI-CA bug?)
 1544              */
 1545             handle_str = acpi_name(handle);
 1546             for (search = scopes; *search != NULL; search++) {
 1547                 if (strcmp(handle_str, *search) == 0)
 1548                     break;
 1549             }
 1550             if (*search != NULL)
 1551                 break;
 1552 
 1553             /* 
 1554              * Create a placeholder device for this node.  Sort the placeholder
 1555              * so that the probe/attach passes will run breadth-first.  Orders
 1556              * less than 10 are reserved for special objects (i.e., system
 1557              * resources).  Larger values are used for all other devices.
 1558              */
 1559             ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "scanning '%s'\n", handle_str));
 1560             order = (level + 1) * 10;
 1561             probe_now = acpi_probe_order(handle, &order);
 1562             child = BUS_ADD_CHILD(bus, order, NULL, -1);
 1563             if (child == NULL)
 1564                 break;
 1565 
 1566             /* Associate the handle with the device_t and vice versa. */
 1567             acpi_set_handle(child, handle);
 1568             AcpiAttachData(handle, acpi_fake_objhandler, child);
 1569 
 1570             /*
 1571              * Check that the device is present.  If it's not present,
 1572              * leave it disabled (so that we have a device_t attached to
 1573              * the handle, but we don't probe it).
 1574              *
 1575              * XXX PCI link devices sometimes report "present" but not
 1576              * "functional" (i.e. if disabled).  Go ahead and probe them
 1577              * anyway since we may enable them later.
 1578              */
 1579             if (type == ACPI_TYPE_DEVICE && !acpi_DeviceIsPresent(child) &&
 1580                 !acpi_MatchHid(handle, "PNP0C0F")) {
 1581                 device_disable(child);
 1582                 break;
 1583             }
 1584 
 1585             /*
 1586              * Get the device's resource settings and attach them.
 1587              * Note that if the device has _PRS but no _CRS, we need
 1588              * to decide when it's appropriate to try to configure the
 1589              * device.  Ignore the return value here; it's OK for the
 1590              * device not to have any resources.
 1591              */
 1592             acpi_parse_resources(child, handle, &acpi_res_parse_set, NULL);
 1593 
 1594             /* If order was overridden, probe/attach now rather than later. */
 1595             if (probe_now)
 1596                 device_probe_and_attach(child);
 1597             break;
 1598         }
 1599     }
 1600 
 1601     return_ACPI_STATUS (AE_OK);
 1602 }
 1603 
 1604 /*
 1605  * AcpiAttachData() requires an object handler but never uses it.  This is a
 1606  * placeholder object handler so we can store a device_t in an ACPI_HANDLE.
 1607  */
 1608 void
 1609 acpi_fake_objhandler(ACPI_HANDLE h, UINT32 fn, void *data)
 1610 {
 1611 }
 1612 
 1613 static void
 1614 acpi_shutdown_final(void *arg, int howto)
 1615 {
 1616     ACPI_STATUS status;
 1617 
 1618     /*
 1619      * XXX Shutdown code should only run on the BSP (cpuid 0).
 1620      * Some chipsets do not power off the system correctly if called from
 1621      * an AP.
 1622      */
 1623     if ((howto & RB_POWEROFF) != 0) {
 1624         status = AcpiEnterSleepStatePrep(ACPI_STATE_S5);
 1625         if (ACPI_FAILURE(status)) {
 1626             printf("AcpiEnterSleepStatePrep failed - %s\n",
 1627                    AcpiFormatException(status));
 1628             return;
 1629         }
 1630         printf("Powering system off using ACPI\n");
 1631         ACPI_DISABLE_IRQS();
 1632         status = AcpiEnterSleepState(ACPI_STATE_S5);
 1633         if (ACPI_FAILURE(status)) {
 1634             printf("ACPI power-off failed - %s\n", AcpiFormatException(status));
 1635         } else {
 1636             DELAY(1000000);
 1637             printf("ACPI power-off failed - timeout\n");
 1638         }
 1639     } else if (panicstr == NULL) {
 1640         printf("Shutting down ACPI\n");
 1641         AcpiTerminate();
 1642     }
 1643 }
 1644 
 1645 static void
 1646 acpi_enable_fixed_events(struct acpi_softc *sc)
 1647 {
 1648     static int  first_time = 1;
 1649 
 1650     /* Enable and clear fixed events and install handlers. */
 1651     if (AcpiGbl_FADT != NULL && AcpiGbl_FADT->PwrButton == 0) {
 1652         AcpiClearEvent(ACPI_EVENT_POWER_BUTTON);
 1653         AcpiInstallFixedEventHandler(ACPI_EVENT_POWER_BUTTON,
 1654                                      acpi_event_power_button_sleep, sc);
 1655         if (first_time)
 1656             device_printf(sc->acpi_dev, "Power Button (fixed)\n");
 1657     }
 1658     if (AcpiGbl_FADT != NULL && AcpiGbl_FADT->SleepButton == 0) {
 1659         AcpiClearEvent(ACPI_EVENT_SLEEP_BUTTON);
 1660         AcpiInstallFixedEventHandler(ACPI_EVENT_SLEEP_BUTTON,
 1661                                      acpi_event_sleep_button_sleep, sc);
 1662         if (first_time)
 1663             device_printf(sc->acpi_dev, "Sleep Button (fixed)\n");
 1664     }
 1665 
 1666     first_time = 0;
 1667 }
 1668 
 1669 /*
 1670  * Returns true if the device is actually present and should
 1671  * be attached to.  This requires the present, enabled, UI-visible 
 1672  * and diagnostics-passed bits to be set.
 1673  */
 1674 BOOLEAN
 1675 acpi_DeviceIsPresent(device_t dev)
 1676 {
 1677     ACPI_DEVICE_INFO    *devinfo;
 1678     ACPI_HANDLE         h;
 1679     ACPI_BUFFER         buf;
 1680     ACPI_STATUS         error;
 1681     int                 ret;
 1682 
 1683     ret = FALSE;
 1684     if ((h = acpi_get_handle(dev)) == NULL)
 1685         return (FALSE);
 1686     buf.Pointer = NULL;
 1687     buf.Length = ACPI_ALLOCATE_BUFFER;
 1688     error = AcpiGetObjectInfo(h, &buf);
 1689     if (ACPI_FAILURE(error))
 1690         return (FALSE);
 1691     devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;
 1692 
 1693     /* If no _STA method, must be present */
 1694     if ((devinfo->Valid & ACPI_VALID_STA) == 0)
 1695         ret = TRUE;
 1696 
 1697     /* Return true for 'present' and 'functioning' */
 1698     if (ACPI_DEVICE_PRESENT(devinfo->CurrentStatus))
 1699         ret = TRUE;
 1700 
 1701     AcpiOsFree(buf.Pointer);
 1702     return (ret);
 1703 }
 1704 
 1705 /*
 1706  * Returns true if the battery is actually present and inserted.
 1707  */
 1708 BOOLEAN
 1709 acpi_BatteryIsPresent(device_t dev)
 1710 {
 1711     ACPI_DEVICE_INFO    *devinfo;
 1712     ACPI_HANDLE         h;
 1713     ACPI_BUFFER         buf;
 1714     ACPI_STATUS         error;
 1715     int                 ret;
 1716 
 1717     ret = FALSE;
 1718     if ((h = acpi_get_handle(dev)) == NULL)
 1719         return (FALSE);
 1720     buf.Pointer = NULL;
 1721     buf.Length = ACPI_ALLOCATE_BUFFER;
 1722     error = AcpiGetObjectInfo(h, &buf);
 1723     if (ACPI_FAILURE(error))
 1724         return (FALSE);
 1725     devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;
 1726 
 1727     /* If no _STA method, must be present */
 1728     if ((devinfo->Valid & ACPI_VALID_STA) == 0)
 1729         ret = TRUE;
 1730 
 1731     /* Return true for 'present', 'battery present', and 'functioning' */
 1732     if (ACPI_BATTERY_PRESENT(devinfo->CurrentStatus))
 1733         ret = TRUE;
 1734 
 1735     AcpiOsFree(buf.Pointer);
 1736     return (ret);
 1737 }
 1738 
 1739 /*
 1740  * Match a HID string against a handle
 1741  */
 1742 static BOOLEAN
 1743 acpi_MatchHid(ACPI_HANDLE h, const char *hid) 
 1744 {
 1745     ACPI_DEVICE_INFO    *devinfo;
 1746     ACPI_BUFFER         buf;
 1747     ACPI_STATUS         error;
 1748     int                 ret, i;
 1749 
 1750     ret = FALSE;
 1751     if (hid == NULL || h == NULL)
 1752         return (ret);
 1753     buf.Pointer = NULL;
 1754     buf.Length = ACPI_ALLOCATE_BUFFER;
 1755     error = AcpiGetObjectInfo(h, &buf);
 1756     if (ACPI_FAILURE(error))
 1757         return (ret);
 1758     devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;
 1759 
 1760     if ((devinfo->Valid & ACPI_VALID_HID) != 0 &&
 1761         strcmp(hid, devinfo->HardwareId.Value) == 0)
 1762             ret = TRUE;
 1763     else if ((devinfo->Valid & ACPI_VALID_CID) != 0) {
 1764         for (i = 0; i < devinfo->CompatibilityId.Count; i++) {
 1765             if (strcmp(hid, devinfo->CompatibilityId.Id[i].Value) == 0) {
 1766                 ret = TRUE;
 1767                 break;
 1768             }
 1769         }
 1770     }
 1771 
 1772     AcpiOsFree(buf.Pointer);
 1773     return (ret);
 1774 }
 1775 
 1776 /*
 1777  * Return the handle of a named object within our scope, ie. that of (parent)
 1778  * or one if its parents.
 1779  */
 1780 ACPI_STATUS
 1781 acpi_GetHandleInScope(ACPI_HANDLE parent, char *path, ACPI_HANDLE *result)
 1782 {
 1783     ACPI_HANDLE         r;
 1784     ACPI_STATUS         status;
 1785 
 1786     /* Walk back up the tree to the root */
 1787     for (;;) {
 1788         status = AcpiGetHandle(parent, path, &r);
 1789         if (ACPI_SUCCESS(status)) {
 1790             *result = r;
 1791             return (AE_OK);
 1792         }
 1793         /* XXX Return error here? */
 1794         if (status != AE_NOT_FOUND)
 1795             return (AE_OK);
 1796         if (ACPI_FAILURE(AcpiGetParent(parent, &r)))
 1797             return (AE_NOT_FOUND);
 1798         parent = r;
 1799     }
 1800 }
 1801 
 1802 /* Find the difference between two PM tick counts. */
 1803 uint32_t
 1804 acpi_TimerDelta(uint32_t end, uint32_t start)
 1805 {
 1806     uint32_t delta;
 1807 
 1808     if (end >= start)
 1809         delta = end - start;
 1810     else if (AcpiGbl_FADT->TmrValExt == 0)
 1811         delta = ((0x00FFFFFF - start) + end + 1) & 0x00FFFFFF;
 1812     else
 1813         delta = ((0xFFFFFFFF - start) + end + 1);
 1814     return (delta);
 1815 }
 1816 
 1817 /*
 1818  * Allocate a buffer with a preset data size.
 1819  */
 1820 ACPI_BUFFER *
 1821 acpi_AllocBuffer(int size)
 1822 {
 1823     ACPI_BUFFER *buf;
 1824 
 1825     if ((buf = malloc(size + sizeof(*buf), M_ACPIDEV, M_NOWAIT)) == NULL)
 1826         return (NULL);
 1827     buf->Length = size;
 1828     buf->Pointer = (void *)(buf + 1);
 1829     return (buf);
 1830 }
 1831 
 1832 ACPI_STATUS
 1833 acpi_SetInteger(ACPI_HANDLE handle, char *path, UINT32 number)
 1834 {
 1835     ACPI_OBJECT arg1;
 1836     ACPI_OBJECT_LIST args;
 1837 
 1838     arg1.Type = ACPI_TYPE_INTEGER;
 1839     arg1.Integer.Value = number;
 1840     args.Count = 1;
 1841     args.Pointer = &arg1;
 1842 
 1843     return (AcpiEvaluateObject(handle, path, &args, NULL));
 1844 }
 1845 
 1846 /*
 1847  * Evaluate a path that should return an integer.
 1848  */
 1849 ACPI_STATUS
 1850 acpi_GetInteger(ACPI_HANDLE handle, char *path, UINT32 *number)
 1851 {
 1852     ACPI_STATUS status;
 1853     ACPI_BUFFER buf;
 1854     ACPI_OBJECT param;
 1855 
 1856     if (handle == NULL)
 1857         handle = ACPI_ROOT_OBJECT;
 1858 
 1859     /*
 1860      * Assume that what we've been pointed at is an Integer object, or
 1861      * a method that will return an Integer.
 1862      */
 1863     buf.Pointer = &param;
 1864     buf.Length = sizeof(param);
 1865     status = AcpiEvaluateObject(handle, path, NULL, &buf);
 1866     if (ACPI_SUCCESS(status)) {
 1867         if (param.Type == ACPI_TYPE_INTEGER)
 1868             *number = param.Integer.Value;
 1869         else
 1870             status = AE_TYPE;
 1871     }
 1872 
 1873     /* 
 1874      * In some applications, a method that's expected to return an Integer
 1875      * may instead return a Buffer (probably to simplify some internal
 1876      * arithmetic).  We'll try to fetch whatever it is, and if it's a Buffer,
 1877      * convert it into an Integer as best we can.
 1878      *
 1879      * This is a hack.
 1880      */
 1881     if (status == AE_BUFFER_OVERFLOW) {
 1882         if ((buf.Pointer = AcpiOsAllocate(buf.Length)) == NULL) {
 1883             status = AE_NO_MEMORY;
 1884         } else {
 1885             status = AcpiEvaluateObject(handle, path, NULL, &buf);
 1886             if (ACPI_SUCCESS(status))
 1887                 status = acpi_ConvertBufferToInteger(&buf, number);
 1888             AcpiOsFree(buf.Pointer);
 1889         }
 1890     }
 1891     return (status);
 1892 }
 1893 
 1894 ACPI_STATUS
 1895 acpi_ConvertBufferToInteger(ACPI_BUFFER *bufp, UINT32 *number)
 1896 {
 1897     ACPI_OBJECT *p;
 1898     UINT8       *val;
 1899     int         i;
 1900 
 1901     p = (ACPI_OBJECT *)bufp->Pointer;
 1902     if (p->Type == ACPI_TYPE_INTEGER) {
 1903         *number = p->Integer.Value;
 1904         return (AE_OK);
 1905     }
 1906     if (p->Type != ACPI_TYPE_BUFFER)
 1907         return (AE_TYPE);
 1908     if (p->Buffer.Length > sizeof(int))
 1909         return (AE_BAD_DATA);
 1910 
 1911     *number = 0;
 1912     val = p->Buffer.Pointer;
 1913     for (i = 0; i < p->Buffer.Length; i++)
 1914         *number += val[i] << (i * 8);
 1915     return (AE_OK);
 1916 }
 1917 
 1918 /*
 1919  * Iterate over the elements of an a package object, calling the supplied
 1920  * function for each element.
 1921  *
 1922  * XXX possible enhancement might be to abort traversal on error.
 1923  */
 1924 ACPI_STATUS
 1925 acpi_ForeachPackageObject(ACPI_OBJECT *pkg,
 1926         void (*func)(ACPI_OBJECT *comp, void *arg), void *arg)
 1927 {
 1928     ACPI_OBJECT *comp;
 1929     int         i;
 1930 
 1931     if (pkg == NULL || pkg->Type != ACPI_TYPE_PACKAGE)
 1932         return (AE_BAD_PARAMETER);
 1933 
 1934     /* Iterate over components */
 1935     i = 0;
 1936     comp = pkg->Package.Elements;
 1937     for (; i < pkg->Package.Count; i++, comp++)
 1938         func(comp, arg);
 1939 
 1940     return (AE_OK);
 1941 }
 1942 
 1943 /*
 1944  * Find the (index)th resource object in a set.
 1945  */
 1946 ACPI_STATUS
 1947 acpi_FindIndexedResource(ACPI_BUFFER *buf, int index, ACPI_RESOURCE **resp)
 1948 {
 1949     ACPI_RESOURCE       *rp;
 1950     int                 i;
 1951 
 1952     rp = (ACPI_RESOURCE *)buf->Pointer;
 1953     i = index;
 1954     while (i-- > 0) {
 1955         /* Range check */
 1956         if (rp > (ACPI_RESOURCE *)((u_int8_t *)buf->Pointer + buf->Length))
 1957             return (AE_BAD_PARAMETER);
 1958 
 1959         /* Check for terminator */
 1960         if (rp->Id == ACPI_RSTYPE_END_TAG || rp->Length == 0)
 1961             return (AE_NOT_FOUND);
 1962         rp = ACPI_NEXT_RESOURCE(rp);
 1963     }
 1964     if (resp != NULL)
 1965         *resp = rp;
 1966 
 1967     return (AE_OK);
 1968 }
 1969 
 1970 /*
 1971  * Append an ACPI_RESOURCE to an ACPI_BUFFER.
 1972  *
 1973  * Given a pointer to an ACPI_RESOURCE structure, expand the ACPI_BUFFER
 1974  * provided to contain it.  If the ACPI_BUFFER is empty, allocate a sensible
 1975  * backing block.  If the ACPI_RESOURCE is NULL, return an empty set of
 1976  * resources.
 1977  */
 1978 #define ACPI_INITIAL_RESOURCE_BUFFER_SIZE       512
 1979 
 1980 ACPI_STATUS
 1981 acpi_AppendBufferResource(ACPI_BUFFER *buf, ACPI_RESOURCE *res)
 1982 {
 1983     ACPI_RESOURCE       *rp;
 1984     void                *newp;
 1985 
 1986     /* Initialise the buffer if necessary. */
 1987     if (buf->Pointer == NULL) {
 1988         buf->Length = ACPI_INITIAL_RESOURCE_BUFFER_SIZE;
 1989         if ((buf->Pointer = AcpiOsAllocate(buf->Length)) == NULL)
 1990             return (AE_NO_MEMORY);
 1991         rp = (ACPI_RESOURCE *)buf->Pointer;
 1992         rp->Id = ACPI_RSTYPE_END_TAG;
 1993         rp->Length = 0;
 1994     }
 1995     if (res == NULL)
 1996         return (AE_OK);
 1997 
 1998     /*
 1999      * Scan the current buffer looking for the terminator.
 2000      * This will either find the terminator or hit the end
 2001      * of the buffer and return an error.
 2002      */
 2003     rp = (ACPI_RESOURCE *)buf->Pointer;
 2004     for (;;) {
 2005         /* Range check, don't go outside the buffer */
 2006         if (rp >= (ACPI_RESOURCE *)((u_int8_t *)buf->Pointer + buf->Length))
 2007             return (AE_BAD_PARAMETER);
 2008         if (rp->Id == ACPI_RSTYPE_END_TAG || rp->Length == 0)
 2009             break;
 2010         rp = ACPI_NEXT_RESOURCE(rp);
 2011     }
 2012 
 2013     /*
 2014      * Check the size of the buffer and expand if required.
 2015      *
 2016      * Required size is:
 2017      *  size of existing resources before terminator + 
 2018      *  size of new resource and header +
 2019      *  size of terminator.
 2020      *
 2021      * Note that this loop should really only run once, unless
 2022      * for some reason we are stuffing a *really* huge resource.
 2023      */
 2024     while ((((u_int8_t *)rp - (u_int8_t *)buf->Pointer) + 
 2025             res->Length + ACPI_RESOURCE_LENGTH_NO_DATA +
 2026             ACPI_RESOURCE_LENGTH) >= buf->Length) {
 2027         if ((newp = AcpiOsAllocate(buf->Length * 2)) == NULL)
 2028             return (AE_NO_MEMORY);
 2029         bcopy(buf->Pointer, newp, buf->Length);
 2030         rp = (ACPI_RESOURCE *)((u_int8_t *)newp +
 2031                                ((u_int8_t *)rp - (u_int8_t *)buf->Pointer));
 2032         AcpiOsFree(buf->Pointer);
 2033         buf->Pointer = newp;
 2034         buf->Length += buf->Length;
 2035     }
 2036 
 2037     /* Insert the new resource. */
 2038     bcopy(res, rp, res->Length + ACPI_RESOURCE_LENGTH_NO_DATA);
 2039 
 2040     /* And add the terminator. */
 2041     rp = ACPI_NEXT_RESOURCE(rp);
 2042     rp->Id = ACPI_RSTYPE_END_TAG;
 2043     rp->Length = 0;
 2044 
 2045     return (AE_OK);
 2046 }
 2047 
 2048 /*
 2049  * Set interrupt model.
 2050  */
 2051 ACPI_STATUS
 2052 acpi_SetIntrModel(int model)
 2053 {
 2054 
 2055     return (acpi_SetInteger(ACPI_ROOT_OBJECT, "_PIC", model));
 2056 }
 2057 
 2058 static void
 2059 acpi_sleep_enable(void *arg)
 2060 {
 2061 
 2062     ((struct acpi_softc *)arg)->acpi_sleep_disabled = 0;
 2063 }
 2064 
 2065 enum acpi_sleep_state {
 2066     ACPI_SS_NONE,
 2067     ACPI_SS_GPE_SET,
 2068     ACPI_SS_DEV_SUSPEND,
 2069     ACPI_SS_SLP_PREP,
 2070     ACPI_SS_SLEPT,
 2071 };
 2072 
 2073 /*
 2074  * Set the system sleep state
 2075  *
 2076  * Currently we support S1-S5 but S4 is only S4BIOS
 2077  */
 2078 ACPI_STATUS
 2079 acpi_SetSleepState(struct acpi_softc *sc, int state)
 2080 {
 2081     ACPI_STATUS status;
 2082     UINT8       TypeA;
 2083     UINT8       TypeB;
 2084     enum acpi_sleep_state slp_state;
 2085 
 2086     ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, state);
 2087 
 2088     status = AE_OK;
 2089     ACPI_LOCK(acpi);
 2090     if (sc->acpi_sleep_disabled) {
 2091         if (sc->acpi_sstate != ACPI_STATE_S0)
 2092             status = AE_ERROR;
 2093         ACPI_UNLOCK(acpi);
 2094         printf("acpi: suspend request ignored (not ready yet)\n");
 2095         return (status);
 2096     }
 2097     sc->acpi_sleep_disabled = 1;
 2098     ACPI_UNLOCK(acpi);
 2099 
 2100     /*
 2101      * Be sure to hold Giant across DEVICE_SUSPEND/RESUME since non-MPSAFE
 2102      * drivers need this.
 2103      */
 2104     mtx_lock(&Giant);
 2105     slp_state = ACPI_SS_NONE;
 2106     switch (state) {
 2107     case ACPI_STATE_S1:
 2108     case ACPI_STATE_S2:
 2109     case ACPI_STATE_S3:
 2110     case ACPI_STATE_S4:
 2111         status = AcpiGetSleepTypeData(state, &TypeA, &TypeB);
 2112         if (status == AE_NOT_FOUND) {
 2113             device_printf(sc->acpi_dev,
 2114                           "Sleep state S%d not supported by BIOS\n", state);
 2115             break;
 2116         } else if (ACPI_FAILURE(status)) {
 2117             device_printf(sc->acpi_dev, "AcpiGetSleepTypeData failed - %s\n",
 2118                           AcpiFormatException(status));
 2119             break;
 2120         }
 2121 
 2122         sc->acpi_sstate = state;
 2123 
 2124         /* Enable any GPEs as appropriate and requested by the user. */
 2125         acpi_wake_prep_walk(state);
 2126         slp_state = ACPI_SS_GPE_SET;
 2127 
 2128         /*
 2129          * Inform all devices that we are going to sleep.  If at least one
 2130          * device fails, DEVICE_SUSPEND() automatically resumes the tree.
 2131          *
 2132          * XXX Note that a better two-pass approach with a 'veto' pass
 2133          * followed by a "real thing" pass would be better, but the current
 2134          * bus interface does not provide for this.
 2135          */
 2136         if (DEVICE_SUSPEND(root_bus) != 0) {
 2137             device_printf(sc->acpi_dev, "device_suspend failed\n");
 2138             break;
 2139         }
 2140         slp_state = ACPI_SS_DEV_SUSPEND;
 2141 
 2142         status = AcpiEnterSleepStatePrep(state);
 2143         if (ACPI_FAILURE(status)) {
 2144             device_printf(sc->acpi_dev, "AcpiEnterSleepStatePrep failed - %s\n",
 2145                           AcpiFormatException(status));
 2146             break;
 2147         }
 2148         slp_state = ACPI_SS_SLP_PREP;
 2149 
 2150         if (sc->acpi_sleep_delay > 0)
 2151             DELAY(sc->acpi_sleep_delay * 1000000);
 2152 
 2153         if (state != ACPI_STATE_S1) {
 2154             acpi_sleep_machdep(sc, state);
 2155 
 2156             /* Re-enable ACPI hardware on wakeup from sleep state 4. */
 2157             if (state == ACPI_STATE_S4)
 2158                 AcpiEnable();
 2159         } else {
 2160             ACPI_DISABLE_IRQS();
 2161             status = AcpiEnterSleepState(state);
 2162             if (ACPI_FAILURE(status)) {
 2163                 device_printf(sc->acpi_dev, "AcpiEnterSleepState failed - %s\n",
 2164                               AcpiFormatException(status));
 2165                 break;
 2166             }
 2167         }
 2168         slp_state = ACPI_SS_SLEPT;
 2169         break;
 2170     case ACPI_STATE_S5:
 2171         /*
 2172          * Shut down cleanly and power off.  This will call us back through the
 2173          * shutdown handlers.
 2174          */
 2175         shutdown_nice(RB_POWEROFF);
 2176         break;
 2177     case ACPI_STATE_S0:
 2178     default:
 2179         status = AE_BAD_PARAMETER;
 2180         break;
 2181     }
 2182 
 2183     /*
 2184      * Back out state according to how far along we got in the suspend
 2185      * process.  This handles both the error and success cases.
 2186      */
 2187     if (slp_state >= ACPI_SS_GPE_SET) {
 2188         acpi_wake_prep_walk(state);
 2189         sc->acpi_sstate = ACPI_STATE_S0;
 2190     }
 2191     if (slp_state >= ACPI_SS_SLP_PREP)
 2192         AcpiLeaveSleepState(state);
 2193     if (slp_state >= ACPI_SS_DEV_SUSPEND)
 2194         DEVICE_RESUME(root_bus);
 2195     if (slp_state >= ACPI_SS_SLEPT)
 2196         acpi_enable_fixed_events(sc);
 2197 
 2198     /* Allow another sleep request after a while. */
 2199     if (state != ACPI_STATE_S5)
 2200         timeout(acpi_sleep_enable, (caddr_t)sc, hz * ACPI_MINIMUM_AWAKETIME);
 2201 
 2202     mtx_unlock(&Giant);
 2203     return_ACPI_STATUS (status);
 2204 }
 2205 
 2206 /* Initialize a device's wake GPE. */
 2207 int
 2208 acpi_wake_init(device_t dev, int type)
 2209 {
 2210     struct acpi_prw_data prw;
 2211 
 2212     /* Evaluate _PRW to find the GPE. */
 2213     if (acpi_parse_prw(acpi_get_handle(dev), &prw) != 0)
 2214         return (ENXIO);
 2215 
 2216     /* Set the requested type for the GPE (runtime, wake, or both). */
 2217     if (ACPI_FAILURE(AcpiSetGpeType(prw.gpe_handle, prw.gpe_bit, type))) {
 2218         device_printf(dev, "set GPE type failed\n");
 2219         return (ENXIO);
 2220     }
 2221 
 2222     return (0);
 2223 }
 2224 
 2225 /* Enable or disable the device's wake GPE. */
 2226 int
 2227 acpi_wake_set_enable(device_t dev, int enable)
 2228 {
 2229     struct acpi_prw_data prw;
 2230     ACPI_HANDLE handle;
 2231     ACPI_STATUS status;
 2232     int flags;
 2233 
 2234     /* Make sure the device supports waking the system and get the GPE. */
 2235     handle = acpi_get_handle(dev);
 2236     if (acpi_parse_prw(handle, &prw) != 0)
 2237         return (ENXIO);
 2238 
 2239     flags = acpi_get_flags(dev);
 2240     if (enable) {
 2241         status = AcpiEnableGpe(prw.gpe_handle, prw.gpe_bit, ACPI_NOT_ISR);
 2242         if (ACPI_FAILURE(status)) {
 2243             device_printf(dev, "enable wake failed\n");
 2244             return (ENXIO);
 2245         }
 2246         acpi_set_flags(dev, flags | ACPI_FLAG_WAKE_ENABLED);
 2247     } else {
 2248         status = AcpiDisableGpe(prw.gpe_handle, prw.gpe_bit, ACPI_NOT_ISR);
 2249         if (ACPI_FAILURE(status)) {
 2250             device_printf(dev, "disable wake failed\n");
 2251             return (ENXIO);
 2252         }
 2253         acpi_set_flags(dev, flags & ~ACPI_FLAG_WAKE_ENABLED);
 2254     }
 2255 
 2256     return (0);
 2257 }
 2258 
 2259 static int
 2260 acpi_wake_sleep_prep(ACPI_HANDLE handle, int sstate)
 2261 {
 2262     struct acpi_prw_data prw;
 2263     device_t dev;
 2264 
 2265     /* Check that this is a wake-capable device and get its GPE. */
 2266     if (acpi_parse_prw(handle, &prw) != 0)
 2267         return (ENXIO);
 2268     dev = acpi_get_device(handle);
 2269 
 2270     /*
 2271      * The destination sleep state must be less than (i.e., higher power)
 2272      * or equal to the value specified by _PRW.  If this GPE cannot be
 2273      * enabled for the next sleep state, then disable it.  If it can and
 2274      * the user requested it be enabled, turn on any required power resources
 2275      * and set _PSW.
 2276      */
 2277     if (sstate > prw.lowest_wake) {
 2278         AcpiDisableGpe(prw.gpe_handle, prw.gpe_bit, ACPI_NOT_ISR);
 2279         if (bootverbose)
 2280             device_printf(dev, "wake_prep disabled wake for %s (S%d)\n",
 2281                 acpi_name(handle), sstate);
 2282     } else if (dev && (acpi_get_flags(dev) & ACPI_FLAG_WAKE_ENABLED) != 0) {
 2283         acpi_pwr_wake_enable(handle, 1);
 2284         acpi_SetInteger(handle, "_PSW", 1);
 2285         if (bootverbose)
 2286             device_printf(dev, "wake_prep enabled for %s (S%d)\n",
 2287                 acpi_name(handle), sstate);
 2288     }
 2289 
 2290     return (0);
 2291 }
 2292 
 2293 static int
 2294 acpi_wake_run_prep(ACPI_HANDLE handle, int sstate)
 2295 {
 2296     struct acpi_prw_data prw;
 2297     device_t dev;
 2298 
 2299     /*
 2300      * Check that this is a wake-capable device and get its GPE.  Return
 2301      * now if the user didn't enable this device for wake.
 2302      */
 2303     if (acpi_parse_prw(handle, &prw) != 0)
 2304         return (ENXIO);
 2305     dev = acpi_get_device(handle);
 2306     if (dev == NULL || (acpi_get_flags(dev) & ACPI_FLAG_WAKE_ENABLED) == 0)
 2307         return (0);
 2308 
 2309     /*
 2310      * If this GPE couldn't be enabled for the previous sleep state, it was
 2311      * disabled before going to sleep so re-enable it.  If it was enabled,
 2312      * clear _PSW and turn off any power resources it used.
 2313      */
 2314     if (sstate > prw.lowest_wake) {
 2315         AcpiEnableGpe(prw.gpe_handle, prw.gpe_bit, ACPI_NOT_ISR);
 2316         if (bootverbose)
 2317             device_printf(dev, "run_prep re-enabled %s\n", acpi_name(handle));
 2318     } else {
 2319         acpi_SetInteger(handle, "_PSW", 0);
 2320         acpi_pwr_wake_enable(handle, 0);
 2321         if (bootverbose)
 2322             device_printf(dev, "run_prep cleaned up for %s\n",
 2323                 acpi_name(handle));
 2324     }
 2325 
 2326     return (0);
 2327 }
 2328 
 2329 static ACPI_STATUS
 2330 acpi_wake_prep(ACPI_HANDLE handle, UINT32 level, void *context, void **status)
 2331 {
 2332     int sstate;
 2333 
 2334     /* If suspending, run the sleep prep function, otherwise wake. */
 2335     sstate = *(int *)context;
 2336     if (AcpiGbl_SystemAwakeAndRunning)
 2337         acpi_wake_sleep_prep(handle, sstate);
 2338     else
 2339         acpi_wake_run_prep(handle, sstate);
 2340     return (AE_OK);
 2341 }
 2342 
 2343 /* Walk the tree rooted at acpi0 to prep devices for suspend/resume. */
 2344 static int
 2345 acpi_wake_prep_walk(int sstate)
 2346 {
 2347     ACPI_HANDLE sb_handle;
 2348 
 2349     if (ACPI_SUCCESS(AcpiGetHandle(ACPI_ROOT_OBJECT, "\\_SB_", &sb_handle)))
 2350         AcpiWalkNamespace(ACPI_TYPE_DEVICE, sb_handle, 100,
 2351             acpi_wake_prep, &sstate, NULL);
 2352     return (0);
 2353 }
 2354 
 2355 /* Walk the tree rooted at acpi0 to attach per-device wake sysctls. */
 2356 static int
 2357 acpi_wake_sysctl_walk(device_t dev)
 2358 {
 2359     int error, i, numdevs;
 2360     device_t *devlist;
 2361     device_t child;
 2362     ACPI_STATUS status;
 2363 
 2364     error = device_get_children(dev, &devlist, &numdevs);
 2365     if (error != 0 || numdevs == 0) {
 2366         if (numdevs == 0)
 2367             free(devlist, M_TEMP);
 2368         return (error);
 2369     }
 2370     for (i = 0; i < numdevs; i++) {
 2371         child = devlist[i];
 2372         acpi_wake_sysctl_walk(child);
 2373         if (!device_is_attached(child))
 2374             continue;
 2375         status = AcpiEvaluateObject(acpi_get_handle(child), "_PRW", NULL, NULL);
 2376         if (ACPI_SUCCESS(status)) {
 2377             SYSCTL_ADD_PROC(device_get_sysctl_ctx(child),
 2378                 SYSCTL_CHILDREN(device_get_sysctl_tree(child)), OID_AUTO,
 2379                 "wake", CTLTYPE_INT | CTLFLAG_RW, child, 0,
 2380                 acpi_wake_set_sysctl, "I", "Device set to wake the system");
 2381         }
 2382     }
 2383     free(devlist, M_TEMP);
 2384 
 2385     return (0);
 2386 }
 2387 
 2388 /* Enable or disable wake from userland. */
 2389 static int
 2390 acpi_wake_set_sysctl(SYSCTL_HANDLER_ARGS)
 2391 {
 2392     int enable, error;
 2393     device_t dev;
 2394 
 2395     dev = (device_t)arg1;
 2396     enable = (acpi_get_flags(dev) & ACPI_FLAG_WAKE_ENABLED) ? 1 : 0;
 2397 
 2398     error = sysctl_handle_int(oidp, &enable, 0, req);
 2399     if (error != 0 || req->newptr == NULL)
 2400         return (error);
 2401     if (enable != 0 && enable != 1)
 2402         return (EINVAL);
 2403 
 2404     return (acpi_wake_set_enable(dev, enable));
 2405 }
 2406 
 2407 /* Parse a device's _PRW into a structure. */
 2408 int
 2409 acpi_parse_prw(ACPI_HANDLE h, struct acpi_prw_data *prw)
 2410 {
 2411     ACPI_STATUS                 status;
 2412     ACPI_BUFFER                 prw_buffer;
 2413     ACPI_OBJECT                 *res, *res2;
 2414     int                         error, i, power_count;
 2415 
 2416     if (h == NULL || prw == NULL)
 2417         return (EINVAL);
 2418 
 2419     /*
 2420      * The _PRW object (7.2.9) is only required for devices that have the
 2421      * ability to wake the system from a sleeping state.
 2422      */
 2423     error = EINVAL;
 2424     prw_buffer.Pointer = NULL;
 2425     prw_buffer.Length = ACPI_ALLOCATE_BUFFER;
 2426     status = AcpiEvaluateObject(h, "_PRW", NULL, &prw_buffer);
 2427     if (ACPI_FAILURE(status))
 2428         return (ENOENT);
 2429     res = (ACPI_OBJECT *)prw_buffer.Pointer;
 2430     if (res == NULL)
 2431         return (ENOENT);
 2432     if (!ACPI_PKG_VALID(res, 2))
 2433         goto out;
 2434 
 2435     /*
 2436      * Element 1 of the _PRW object:
 2437      * The lowest power system sleeping state that can be entered while still
 2438      * providing wake functionality.  The sleeping state being entered must
 2439      * be less than (i.e., higher power) or equal to this value.
 2440      */
 2441     if (acpi_PkgInt32(res, 1, &prw->lowest_wake) != 0)
 2442         goto out;
 2443 
 2444     /*
 2445      * Element 0 of the _PRW object:
 2446      */
 2447     switch (res->Package.Elements[0].Type) {
 2448     case ACPI_TYPE_INTEGER:
 2449         /*
 2450          * If the data type of this package element is numeric, then this
 2451          * _PRW package element is the bit index in the GPEx_EN, in the
 2452          * GPE blocks described in the FADT, of the enable bit that is
 2453          * enabled for the wake event.
 2454          */
 2455         prw->gpe_handle = NULL;
 2456         prw->gpe_bit = res->Package.Elements[0].Integer.Value;
 2457         error = 0;
 2458         break;
 2459     case ACPI_TYPE_PACKAGE:
 2460         /*
 2461          * If the data type of this package element is a package, then this
 2462          * _PRW package element is itself a package containing two
 2463          * elements.  The first is an object reference to the GPE Block
 2464          * device that contains the GPE that will be triggered by the wake
 2465          * event.  The second element is numeric and it contains the bit
 2466          * index in the GPEx_EN, in the GPE Block referenced by the
 2467          * first element in the package, of the enable bit that is enabled for
 2468          * the wake event.
 2469          *
 2470          * For example, if this field is a package then it is of the form:
 2471          * Package() {\_SB.PCI0.ISA.GPE, 2}
 2472          */
 2473         res2 = &res->Package.Elements[0];
 2474         if (!ACPI_PKG_VALID(res2, 2))
 2475             goto out;
 2476         prw->gpe_handle = acpi_GetReference(NULL, &res2->Package.Elements[0]);
 2477         if (prw->gpe_handle == NULL)
 2478             goto out;
 2479         if (acpi_PkgInt32(res2, 1, &prw->gpe_bit) != 0)
 2480             goto out;
 2481         error = 0;
 2482         break;
 2483     default:
 2484         goto out;
 2485     }
 2486 
 2487     /* Elements 2 to N of the _PRW object are power resources. */
 2488     power_count = res->Package.Count - 2;
 2489     if (power_count > ACPI_PRW_MAX_POWERRES) {
 2490         printf("ACPI device %s has too many power resources\n", acpi_name(h));
 2491         power_count = 0;
 2492     }
 2493     prw->power_res_count = power_count;
 2494     for (i = 0; i < power_count; i++)
 2495         prw->power_res[i] = res->Package.Elements[i];
 2496 
 2497 out:
 2498     if (prw_buffer.Pointer != NULL)
 2499         AcpiOsFree(prw_buffer.Pointer);
 2500     return (error);
 2501 }
 2502 
 2503 /*
 2504  * ACPI Event Handlers
 2505  */
 2506 
 2507 /* System Event Handlers (registered by EVENTHANDLER_REGISTER) */
 2508 
 2509 static void
 2510 acpi_system_eventhandler_sleep(void *arg, int state)
 2511 {
 2512 
 2513     ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, state);
 2514 
 2515     if (state >= ACPI_STATE_S0 && state <= ACPI_S_STATES_MAX)
 2516         acpi_SetSleepState((struct acpi_softc *)arg, state);
 2517 
 2518     return_VOID;
 2519 }
 2520 
 2521 static void
 2522 acpi_system_eventhandler_wakeup(void *arg, int state)
 2523 {
 2524 
 2525     ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, state);
 2526 
 2527     /* Currently, nothing to do for wakeup. */
 2528 
 2529     return_VOID;
 2530 }
 2531 
 2532 /* 
 2533  * ACPICA Event Handlers (FixedEvent, also called from button notify handler)
 2534  */
 2535 UINT32
 2536 acpi_event_power_button_sleep(void *context)
 2537 {
 2538     struct acpi_softc   *sc = (struct acpi_softc *)context;
 2539 
 2540     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 2541 
 2542     EVENTHANDLER_INVOKE(acpi_sleep_event, sc->acpi_power_button_sx);
 2543 
 2544     return_VALUE (ACPI_INTERRUPT_HANDLED);
 2545 }
 2546 
 2547 UINT32
 2548 acpi_event_power_button_wake(void *context)
 2549 {
 2550     struct acpi_softc   *sc = (struct acpi_softc *)context;
 2551 
 2552     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 2553 
 2554     EVENTHANDLER_INVOKE(acpi_wakeup_event, sc->acpi_power_button_sx);
 2555 
 2556     return_VALUE (ACPI_INTERRUPT_HANDLED);
 2557 }
 2558 
 2559 UINT32
 2560 acpi_event_sleep_button_sleep(void *context)
 2561 {
 2562     struct acpi_softc   *sc = (struct acpi_softc *)context;
 2563 
 2564     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 2565 
 2566     EVENTHANDLER_INVOKE(acpi_sleep_event, sc->acpi_sleep_button_sx);
 2567 
 2568     return_VALUE (ACPI_INTERRUPT_HANDLED);
 2569 }
 2570 
 2571 UINT32
 2572 acpi_event_sleep_button_wake(void *context)
 2573 {
 2574     struct acpi_softc   *sc = (struct acpi_softc *)context;
 2575 
 2576     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 2577 
 2578     EVENTHANDLER_INVOKE(acpi_wakeup_event, sc->acpi_sleep_button_sx);
 2579 
 2580     return_VALUE (ACPI_INTERRUPT_HANDLED);
 2581 }
 2582 
 2583 /*
 2584  * XXX This static buffer is suboptimal.  There is no locking so only
 2585  * use this for single-threaded callers.
 2586  */
 2587 char *
 2588 acpi_name(ACPI_HANDLE handle)
 2589 {
 2590     ACPI_BUFFER buf;
 2591     static char data[256];
 2592 
 2593     buf.Length = sizeof(data);
 2594     buf.Pointer = data;
 2595 
 2596     if (handle && ACPI_SUCCESS(AcpiGetName(handle, ACPI_FULL_PATHNAME, &buf)))
 2597         return (data);
 2598     return ("(unknown)");
 2599 }
 2600 
 2601 /*
 2602  * Debugging/bug-avoidance.  Avoid trying to fetch info on various
 2603  * parts of the namespace.
 2604  */
 2605 int
 2606 acpi_avoid(ACPI_HANDLE handle)
 2607 {
 2608     char        *cp, *env, *np;
 2609     int         len;
 2610 
 2611     np = acpi_name(handle);
 2612     if (*np == '\\')
 2613         np++;
 2614     if ((env = getenv("debug.acpi.avoid")) == NULL)
 2615         return (0);
 2616 
 2617     /* Scan the avoid list checking for a match */
 2618     cp = env;
 2619     for (;;) {
 2620         while (*cp != 0 && isspace(*cp))
 2621             cp++;
 2622         if (*cp == 0)
 2623             break;
 2624         len = 0;
 2625         while (cp[len] != 0 && !isspace(cp[len]))
 2626             len++;
 2627         if (!strncmp(cp, np, len)) {
 2628             freeenv(env);
 2629             return(1);
 2630         }
 2631         cp += len;
 2632     }
 2633     freeenv(env);
 2634 
 2635     return (0);
 2636 }
 2637 
 2638 /*
 2639  * Debugging/bug-avoidance.  Disable ACPI subsystem components.
 2640  */
 2641 int
 2642 acpi_disabled(char *subsys)
 2643 {
 2644     char        *cp, *env;
 2645     int         len;
 2646 
 2647     if ((env = getenv("debug.acpi.disabled")) == NULL)
 2648         return (0);
 2649     if (strcmp(env, "all") == 0) {
 2650         freeenv(env);
 2651         return (1);
 2652     }
 2653 
 2654     /* Scan the disable list, checking for a match. */
 2655     cp = env;
 2656     for (;;) {
 2657         while (*cp != '\0' && isspace(*cp))
 2658             cp++;
 2659         if (*cp == '\0')
 2660             break;
 2661         len = 0;
 2662         while (cp[len] != '\0' && !isspace(cp[len]))
 2663             len++;
 2664         if (strncmp(cp, subsys, len) == 0) {
 2665             freeenv(env);
 2666             return (1);
 2667         }
 2668         cp += len;
 2669     }
 2670     freeenv(env);
 2671 
 2672     return (0);
 2673 }
 2674 
 2675 /*
 2676  * Control interface.
 2677  *
 2678  * We multiplex ioctls for all participating ACPI devices here.  Individual 
 2679  * drivers wanting to be accessible via /dev/acpi should use the
 2680  * register/deregister interface to make their handlers visible.
 2681  */
 2682 struct acpi_ioctl_hook
 2683 {
 2684     TAILQ_ENTRY(acpi_ioctl_hook) link;
 2685     u_long                       cmd;
 2686     acpi_ioctl_fn                fn;
 2687     void                         *arg;
 2688 };
 2689 
 2690 static TAILQ_HEAD(,acpi_ioctl_hook)     acpi_ioctl_hooks;
 2691 static int                              acpi_ioctl_hooks_initted;
 2692 
 2693 int
 2694 acpi_register_ioctl(u_long cmd, acpi_ioctl_fn fn, void *arg)
 2695 {
 2696     struct acpi_ioctl_hook      *hp;
 2697 
 2698     if ((hp = malloc(sizeof(*hp), M_ACPIDEV, M_NOWAIT)) == NULL)
 2699         return (ENOMEM);
 2700     hp->cmd = cmd;
 2701     hp->fn = fn;
 2702     hp->arg = arg;
 2703 
 2704     ACPI_LOCK(acpi);
 2705     if (acpi_ioctl_hooks_initted == 0) {
 2706         TAILQ_INIT(&acpi_ioctl_hooks);
 2707         acpi_ioctl_hooks_initted = 1;
 2708     }
 2709     TAILQ_INSERT_TAIL(&acpi_ioctl_hooks, hp, link);
 2710     ACPI_UNLOCK(acpi);
 2711 
 2712     return (0);
 2713 }
 2714 
 2715 void
 2716 acpi_deregister_ioctl(u_long cmd, acpi_ioctl_fn fn)
 2717 {
 2718     struct acpi_ioctl_hook      *hp;
 2719 
 2720     ACPI_LOCK(acpi);
 2721     TAILQ_FOREACH(hp, &acpi_ioctl_hooks, link)
 2722         if (hp->cmd == cmd && hp->fn == fn)
 2723             break;
 2724 
 2725     if (hp != NULL) {
 2726         TAILQ_REMOVE(&acpi_ioctl_hooks, hp, link);
 2727         free(hp, M_ACPIDEV);
 2728     }
 2729     ACPI_UNLOCK(acpi);
 2730 }
 2731 
 2732 static int
 2733 acpiopen(struct cdev *dev, int flag, int fmt, d_thread_t *td)
 2734 {
 2735     return (0);
 2736 }
 2737 
 2738 static int
 2739 acpiclose(struct cdev *dev, int flag, int fmt, d_thread_t *td)
 2740 {
 2741     return (0);
 2742 }
 2743 
 2744 static int
 2745 acpiioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, d_thread_t *td)
 2746 {
 2747     struct acpi_softc           *sc;
 2748     struct acpi_ioctl_hook      *hp;
 2749     int                         error, state;
 2750 
 2751     error = 0;
 2752     hp = NULL;
 2753     sc = dev->si_drv1;
 2754 
 2755     /*
 2756      * Scan the list of registered ioctls, looking for handlers.
 2757      */
 2758     ACPI_LOCK(acpi);
 2759     if (acpi_ioctl_hooks_initted)
 2760         TAILQ_FOREACH(hp, &acpi_ioctl_hooks, link) {
 2761             if (hp->cmd == cmd)
 2762                 break;
 2763         }
 2764     ACPI_UNLOCK(acpi);
 2765     if (hp)
 2766         return (hp->fn(cmd, addr, hp->arg));
 2767 
 2768     /*
 2769      * Core ioctls are not permitted for non-writable user.
 2770      * Currently, other ioctls just fetch information.
 2771      * Not changing system behavior.
 2772      */
 2773     if ((flag & FWRITE) == 0)
 2774         return (EPERM);
 2775 
 2776     /* Core system ioctls. */
 2777     switch (cmd) {
 2778     case ACPIIO_SETSLPSTATE:
 2779         error = EINVAL;
 2780         state = *(int *)addr;
 2781         if (state >= ACPI_STATE_S0 && state <= ACPI_S_STATES_MAX)
 2782             if (ACPI_SUCCESS(acpi_SetSleepState(sc, state)))
 2783                 error = 0;
 2784         break;
 2785     default:
 2786         error = ENXIO;
 2787         break;
 2788     }
 2789 
 2790     return (error);
 2791 }
 2792 
 2793 static int
 2794 acpi_supported_sleep_state_sysctl(SYSCTL_HANDLER_ARGS)
 2795 {
 2796     int error;
 2797     struct sbuf sb;
 2798     UINT8 state, TypeA, TypeB;
 2799 
 2800     sbuf_new(&sb, NULL, 32, SBUF_AUTOEXTEND);
 2801     for (state = ACPI_STATE_S1; state < ACPI_S_STATES_MAX + 1; state++)
 2802         if (ACPI_SUCCESS(AcpiGetSleepTypeData(state, &TypeA, &TypeB)))
 2803             sbuf_printf(&sb, "S%d ", state);
 2804     sbuf_trim(&sb);
 2805     sbuf_finish(&sb);
 2806     error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req);
 2807     sbuf_delete(&sb);
 2808     return (error);
 2809 }
 2810 
 2811 static int
 2812 acpi_sleep_state_sysctl(SYSCTL_HANDLER_ARGS)
 2813 {
 2814     char sleep_state[10];
 2815     int error;
 2816     u_int new_state, old_state;
 2817 
 2818     old_state = *(u_int *)oidp->oid_arg1;
 2819     if (old_state > ACPI_S_STATES_MAX + 1)
 2820         strlcpy(sleep_state, "unknown", sizeof(sleep_state));
 2821     else
 2822         strlcpy(sleep_state, sleep_state_names[old_state], sizeof(sleep_state));
 2823     error = sysctl_handle_string(oidp, sleep_state, sizeof(sleep_state), req);
 2824     if (error == 0 && req->newptr != NULL) {
 2825         new_state = ACPI_STATE_S0;
 2826         for (; new_state <= ACPI_S_STATES_MAX + 1; new_state++)
 2827             if (strcmp(sleep_state, sleep_state_names[new_state]) == 0)
 2828                 break;
 2829         if (new_state <= ACPI_S_STATES_MAX + 1) {
 2830             if (new_state != old_state)
 2831                 *(u_int *)oidp->oid_arg1 = new_state;
 2832         } else
 2833             error = EINVAL;
 2834     }
 2835 
 2836     return (error);
 2837 }
 2838 
 2839 /* Inform devctl(4) when we receive a Notify. */
 2840 void
 2841 acpi_UserNotify(const char *subsystem, ACPI_HANDLE h, uint8_t notify)
 2842 {
 2843     char                notify_buf[16];
 2844     ACPI_BUFFER         handle_buf;
 2845     ACPI_STATUS         status;
 2846 
 2847     if (subsystem == NULL)
 2848         return;
 2849 
 2850     handle_buf.Pointer = NULL;
 2851     handle_buf.Length = ACPI_ALLOCATE_BUFFER;
 2852     status = AcpiNsHandleToPathname(h, &handle_buf);
 2853     if (ACPI_FAILURE(status))
 2854         return;
 2855     snprintf(notify_buf, sizeof(notify_buf), "notify=0x%02x", notify);
 2856     devctl_notify("ACPI", subsystem, handle_buf.Pointer, notify_buf);
 2857     AcpiOsFree(handle_buf.Pointer);
 2858 }
 2859 
 2860 #ifdef ACPI_DEBUG
 2861 /*
 2862  * Support for parsing debug options from the kernel environment.
 2863  *
 2864  * Bits may be set in the AcpiDbgLayer and AcpiDbgLevel debug registers
 2865  * by specifying the names of the bits in the debug.acpi.layer and
 2866  * debug.acpi.level environment variables.  Bits may be unset by 
 2867  * prefixing the bit name with !.
 2868  */
 2869 struct debugtag
 2870 {
 2871     char        *name;
 2872     UINT32      value;
 2873 };
 2874 
 2875 static struct debugtag  dbg_layer[] = {
 2876     {"ACPI_UTILITIES",          ACPI_UTILITIES},
 2877     {"ACPI_HARDWARE",           ACPI_HARDWARE},
 2878     {"ACPI_EVENTS",             ACPI_EVENTS},
 2879     {"ACPI_TABLES",             ACPI_TABLES},
 2880     {"ACPI_NAMESPACE",          ACPI_NAMESPACE},
 2881     {"ACPI_PARSER",             ACPI_PARSER},
 2882     {"ACPI_DISPATCHER",         ACPI_DISPATCHER},
 2883     {"ACPI_EXECUTER",           ACPI_EXECUTER},
 2884     {"ACPI_RESOURCES",          ACPI_RESOURCES},
 2885     {"ACPI_CA_DEBUGGER",        ACPI_CA_DEBUGGER},
 2886     {"ACPI_OS_SERVICES",        ACPI_OS_SERVICES},
 2887     {"ACPI_CA_DISASSEMBLER",    ACPI_CA_DISASSEMBLER},
 2888     {"ACPI_ALL_COMPONENTS",     ACPI_ALL_COMPONENTS},
 2889 
 2890     {"ACPI_AC_ADAPTER",         ACPI_AC_ADAPTER},
 2891     {"ACPI_BATTERY",            ACPI_BATTERY},
 2892     {"ACPI_BUS",                ACPI_BUS},
 2893     {"ACPI_BUTTON",             ACPI_BUTTON},
 2894     {"ACPI_EC",                 ACPI_EC},
 2895     {"ACPI_FAN",                ACPI_FAN},
 2896     {"ACPI_POWERRES",           ACPI_POWERRES},
 2897     {"ACPI_PROCESSOR",          ACPI_PROCESSOR},
 2898     {"ACPI_THERMAL",            ACPI_THERMAL},
 2899     {"ACPI_TIMER",              ACPI_TIMER},
 2900     {"ACPI_ALL_DRIVERS",        ACPI_ALL_DRIVERS},
 2901     {NULL, 0}
 2902 };
 2903 
 2904 static struct debugtag dbg_level[] = {
 2905     {"ACPI_LV_ERROR",           ACPI_LV_ERROR},
 2906     {"ACPI_LV_WARN",            ACPI_LV_WARN},
 2907     {"ACPI_LV_INIT",            ACPI_LV_INIT},
 2908     {"ACPI_LV_DEBUG_OBJECT",    ACPI_LV_DEBUG_OBJECT},
 2909     {"ACPI_LV_INFO",            ACPI_LV_INFO},
 2910     {"ACPI_LV_ALL_EXCEPTIONS",  ACPI_LV_ALL_EXCEPTIONS},
 2911 
 2912     /* Trace verbosity level 1 [Standard Trace Level] */
 2913     {"ACPI_LV_INIT_NAMES",      ACPI_LV_INIT_NAMES},
 2914     {"ACPI_LV_PARSE",           ACPI_LV_PARSE},
 2915     {"ACPI_LV_LOAD",            ACPI_LV_LOAD},
 2916     {"ACPI_LV_DISPATCH",        ACPI_LV_DISPATCH},
 2917     {"ACPI_LV_EXEC",            ACPI_LV_EXEC},
 2918     {"ACPI_LV_NAMES",           ACPI_LV_NAMES},
 2919     {"ACPI_LV_OPREGION",        ACPI_LV_OPREGION},
 2920     {"ACPI_LV_BFIELD",          ACPI_LV_BFIELD},
 2921     {"ACPI_LV_TABLES",          ACPI_LV_TABLES},
 2922     {"ACPI_LV_VALUES",          ACPI_LV_VALUES},
 2923     {"ACPI_LV_OBJECTS",         ACPI_LV_OBJECTS},
 2924     {"ACPI_LV_RESOURCES",       ACPI_LV_RESOURCES},
 2925     {"ACPI_LV_USER_REQUESTS",   ACPI_LV_USER_REQUESTS},
 2926     {"ACPI_LV_PACKAGE",         ACPI_LV_PACKAGE},
 2927     {"ACPI_LV_VERBOSITY1",      ACPI_LV_VERBOSITY1},
 2928 
 2929     /* Trace verbosity level 2 [Function tracing and memory allocation] */
 2930     {"ACPI_LV_ALLOCATIONS",     ACPI_LV_ALLOCATIONS},
 2931     {"ACPI_LV_FUNCTIONS",       ACPI_LV_FUNCTIONS},
 2932     {"ACPI_LV_OPTIMIZATIONS",   ACPI_LV_OPTIMIZATIONS},
 2933     {"ACPI_LV_VERBOSITY2",      ACPI_LV_VERBOSITY2},
 2934     {"ACPI_LV_ALL",             ACPI_LV_ALL},
 2935 
 2936     /* Trace verbosity level 3 [Threading, I/O, and Interrupts] */
 2937     {"ACPI_LV_MUTEX",           ACPI_LV_MUTEX},
 2938     {"ACPI_LV_THREADS",         ACPI_LV_THREADS},
 2939     {"ACPI_LV_IO",              ACPI_LV_IO},
 2940     {"ACPI_LV_INTERRUPTS",      ACPI_LV_INTERRUPTS},
 2941     {"ACPI_LV_VERBOSITY3",      ACPI_LV_VERBOSITY3},
 2942 
 2943     /* Exceptionally verbose output -- also used in the global "DebugLevel"  */
 2944     {"ACPI_LV_AML_DISASSEMBLE", ACPI_LV_AML_DISASSEMBLE},
 2945     {"ACPI_LV_VERBOSE_INFO",    ACPI_LV_VERBOSE_INFO},
 2946     {"ACPI_LV_FULL_TABLES",     ACPI_LV_FULL_TABLES},
 2947     {"ACPI_LV_EVENTS",          ACPI_LV_EVENTS},
 2948     {"ACPI_LV_VERBOSE",         ACPI_LV_VERBOSE},
 2949     {NULL, 0}
 2950 };    
 2951 
 2952 static void
 2953 acpi_parse_debug(char *cp, struct debugtag *tag, UINT32 *flag)
 2954 {
 2955     char        *ep;
 2956     int         i, l;
 2957     int         set;
 2958 
 2959     while (*cp) {
 2960         if (isspace(*cp)) {
 2961             cp++;
 2962             continue;
 2963         }
 2964         ep = cp;
 2965         while (*ep && !isspace(*ep))
 2966             ep++;
 2967         if (*cp == '!') {
 2968             set = 0;
 2969             cp++;
 2970             if (cp == ep)
 2971                 continue;
 2972         } else {
 2973             set = 1;
 2974         }
 2975         l = ep - cp;
 2976         for (i = 0; tag[i].name != NULL; i++) {
 2977             if (!strncmp(cp, tag[i].name, l)) {
 2978                 if (set)
 2979                     *flag |= tag[i].value;
 2980                 else
 2981                     *flag &= ~tag[i].value;
 2982             }
 2983         }
 2984         cp = ep;
 2985     }
 2986 }
 2987 
 2988 static void
 2989 acpi_set_debugging(void *junk)
 2990 {
 2991     char        *layer, *level;
 2992 
 2993     if (cold) {
 2994         AcpiDbgLayer = 0;
 2995         AcpiDbgLevel = 0;
 2996     }
 2997 
 2998     layer = getenv("debug.acpi.layer");
 2999     level = getenv("debug.acpi.level");
 3000     if (layer == NULL && level == NULL)
 3001         return;
 3002 
 3003     printf("ACPI set debug");
 3004     if (layer != NULL) {
 3005         if (strcmp("NONE", layer) != 0)
 3006             printf(" layer '%s'", layer);
 3007         acpi_parse_debug(layer, &dbg_layer[0], &AcpiDbgLayer);
 3008         freeenv(layer);
 3009     }
 3010     if (level != NULL) {
 3011         if (strcmp("NONE", level) != 0)
 3012             printf(" level '%s'", level);
 3013         acpi_parse_debug(level, &dbg_level[0], &AcpiDbgLevel);
 3014         freeenv(level);
 3015     }
 3016     printf("\n");
 3017 }
 3018 
 3019 SYSINIT(acpi_debugging, SI_SUB_TUNABLES, SI_ORDER_ANY, acpi_set_debugging,
 3020         NULL);
 3021 
 3022 static int
 3023 acpi_debug_sysctl(SYSCTL_HANDLER_ARGS)
 3024 {
 3025     int          error, *dbg;
 3026     struct       debugtag *tag;
 3027     struct       sbuf sb;
 3028 
 3029     if (sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND) == NULL)
 3030         return (ENOMEM);
 3031     if (strcmp(oidp->oid_arg1, "debug.acpi.layer") == 0) {
 3032         tag = &dbg_layer[0];
 3033         dbg = &AcpiDbgLayer;
 3034     } else {
 3035         tag = &dbg_level[0];
 3036         dbg = &AcpiDbgLevel;
 3037     }
 3038 
 3039     /* Get old values if this is a get request. */
 3040     ACPI_SERIAL_BEGIN(acpi);
 3041     if (*dbg == 0) {
 3042         sbuf_cpy(&sb, "NONE");
 3043     } else if (req->newptr == NULL) {
 3044         for (; tag->name != NULL; tag++) {
 3045             if ((*dbg & tag->value) == tag->value)
 3046                 sbuf_printf(&sb, "%s ", tag->name);
 3047         }
 3048     }
 3049     sbuf_trim(&sb);
 3050     sbuf_finish(&sb);
 3051 
 3052     /* Copy out the old values to the user. */
 3053     error = SYSCTL_OUT(req, sbuf_data(&sb), sbuf_len(&sb));
 3054     sbuf_delete(&sb);
 3055 
 3056     /* If the user is setting a string, parse it. */
 3057     if (error == 0 && req->newptr != NULL) {
 3058         *dbg = 0;
 3059         setenv((char *)oidp->oid_arg1, (char *)req->newptr);
 3060         acpi_set_debugging(NULL);
 3061     }
 3062     ACPI_SERIAL_END(acpi);
 3063 
 3064     return (error);
 3065 }
 3066 
 3067 SYSCTL_PROC(_debug_acpi, OID_AUTO, layer, CTLFLAG_RW | CTLTYPE_STRING,
 3068             "debug.acpi.layer", 0, acpi_debug_sysctl, "A", "");
 3069 SYSCTL_PROC(_debug_acpi, OID_AUTO, level, CTLFLAG_RW | CTLTYPE_STRING,
 3070             "debug.acpi.level", 0, acpi_debug_sysctl, "A", "");
 3071 #endif /* ACPI_DEBUG */
 3072 
 3073 static int
 3074 acpi_pm_func(u_long cmd, void *arg, ...)
 3075 {
 3076         int     state, acpi_state;
 3077         int     error;
 3078         struct  acpi_softc *sc;
 3079         va_list ap;
 3080 
 3081         error = 0;
 3082         switch (cmd) {
 3083         case POWER_CMD_SUSPEND:
 3084                 sc = (struct acpi_softc *)arg;
 3085                 if (sc == NULL) {
 3086                         error = EINVAL;
 3087                         goto out;
 3088                 }
 3089 
 3090                 va_start(ap, arg);
 3091                 state = va_arg(ap, int);
 3092                 va_end(ap);
 3093 
 3094                 switch (state) {
 3095                 case POWER_SLEEP_STATE_STANDBY:
 3096                         acpi_state = sc->acpi_standby_sx;
 3097                         break;
 3098                 case POWER_SLEEP_STATE_SUSPEND:
 3099                         acpi_state = sc->acpi_suspend_sx;
 3100                         break;
 3101                 case POWER_SLEEP_STATE_HIBERNATE:
 3102                         acpi_state = ACPI_STATE_S4;
 3103                         break;
 3104                 default:
 3105                         error = EINVAL;
 3106                         goto out;
 3107                 }
 3108 
 3109                 acpi_SetSleepState(sc, acpi_state);
 3110                 break;
 3111         default:
 3112                 error = EINVAL;
 3113                 goto out;
 3114         }
 3115 
 3116 out:
 3117         return (error);
 3118 }
 3119 
 3120 static void
 3121 acpi_pm_register(void *arg)
 3122 {
 3123     if (!cold || resource_disabled("acpi", 0))
 3124         return;
 3125 
 3126     power_pm_register(POWER_PM_TYPE_ACPI, acpi_pm_func, NULL);
 3127 }
 3128 
 3129 SYSINIT(power, SI_SUB_KLD, SI_ORDER_ANY, acpi_pm_register, 0);

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