FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpi.c

     /*-
      * Copyright (c) 2000 Takanori Watanabe <takawata@jp.freebsd.org>
      * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@jp.freebsd.org>
      * Copyright (c) 2000, 2001 Michael Smith
      * Copyright (c) 2000 BSDi
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      $FreeBSD: releng/5.2/sys/dev/acpica/acpi.c 123973 2003-12-29 15:48:16Z jhb $
     */
    
    #include "opt_acpi.h"
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/proc.h>
    #include <sys/fcntl.h>
    #include <sys/malloc.h>
    #include <sys/bus.h>
    #include <sys/conf.h>
    #include <sys/ioccom.h>
    #include <sys/reboot.h>
    #include <sys/sysctl.h>
    #include <sys/ctype.h>
    #include <sys/linker.h>
    #include <sys/power.h>
    
    #include <machine/clock.h>
    #include <machine/resource.h>
    #include <machine/bus.h>
    #include <sys/rman.h>
    #include <isa/isavar.h>
    
    #include "acpi.h"
    #include <dev/acpica/acpivar.h>
    #include <dev/acpica/acpiio.h>
    #include <contrib/dev/acpica/acnamesp.h>
    
    MALLOC_DEFINE(M_ACPIDEV, "acpidev", "ACPI devices");
    
    /* Hooks for the ACPI CA debugging infrastructure */
    #define _COMPONENT      ACPI_BUS
    ACPI_MODULE_NAME("ACPI")
    
    static d_open_t         acpiopen;
    static d_close_t        acpiclose;
    static d_ioctl_t        acpiioctl;
    
    #define CDEV_MAJOR 152
    static struct cdevsw acpi_cdevsw = {
            .d_open =       acpiopen,
            .d_close =      acpiclose,
            .d_ioctl =      acpiioctl,
            .d_name =       "acpi",
            .d_maj =        CDEV_MAJOR,
    };
    
    static const char* sleep_state_names[] = {
        "S0", "S1", "S2", "S3", "S4", "S5", "NONE"};
    
    /* this has to be static, as the softc is gone when we need it */
    static int acpi_off_state = ACPI_STATE_S5;
    
    #if __FreeBSD_version >= 500000
    struct mtx      acpi_mutex;
    #endif
    
    static int      acpi_modevent(struct module *mod, int event, void *junk);
    static void     acpi_identify(driver_t *driver, device_t parent);
    static int      acpi_probe(device_t dev);
    static int      acpi_attach(device_t dev);
    static device_t acpi_add_child(device_t bus, int order, const char *name,
                            int unit);
    static int      acpi_print_child(device_t bus, device_t child);
    static int      acpi_read_ivar(device_t dev, device_t child, int index,
                            uintptr_t *result);
    static int      acpi_write_ivar(device_t dev, device_t child, int index,
                            uintptr_t value);
    static int      acpi_set_resource(device_t dev, device_t child, int type,
                            int rid, u_long start, u_long count);
   static int      acpi_get_resource(device_t dev, device_t child, int type,
                           int rid, u_long *startp, u_long *countp);
   static struct resource *acpi_alloc_resource(device_t bus, device_t child,
                           int type, int *rid, u_long start, u_long end,
                           u_long count, u_int flags);
   static int      acpi_release_resource(device_t bus, device_t child, int type,
                           int rid, struct resource *r);
   static uint32_t acpi_isa_get_logicalid(device_t dev);
   static int      acpi_isa_get_compatid(device_t dev, uint32_t *cids, int count);
   static int      acpi_isa_pnp_probe(device_t bus, device_t child,
                           struct isa_pnp_id *ids);
   static void     acpi_probe_children(device_t bus);
   static ACPI_STATUS acpi_probe_child(ACPI_HANDLE handle, UINT32 level,
                           void *context, void **status);
   static void     acpi_shutdown_pre_sync(void *arg, int howto);
   static void     acpi_shutdown_final(void *arg, int howto);
   static void     acpi_enable_fixed_events(struct acpi_softc *sc);
   static void     acpi_system_eventhandler_sleep(void *arg, int state);
   static void     acpi_system_eventhandler_wakeup(void *arg, int state);
   static int      acpi_supported_sleep_state_sysctl(SYSCTL_HANDLER_ARGS);
   static int      acpi_sleep_state_sysctl(SYSCTL_HANDLER_ARGS);
   static int      acpi_pm_func(u_long cmd, void *arg, ...);
   
   static device_method_t acpi_methods[] = {
       /* Device interface */
       DEVMETHOD(device_identify,          acpi_identify),
       DEVMETHOD(device_probe,             acpi_probe),
       DEVMETHOD(device_attach,            acpi_attach),
       DEVMETHOD(device_detach,            bus_generic_detach),
       DEVMETHOD(device_shutdown,          bus_generic_shutdown),
       DEVMETHOD(device_suspend,           bus_generic_suspend),
       DEVMETHOD(device_resume,            bus_generic_resume),
   
       /* Bus interface */
       DEVMETHOD(bus_add_child,            acpi_add_child),
       DEVMETHOD(bus_print_child,          acpi_print_child),
       DEVMETHOD(bus_read_ivar,            acpi_read_ivar),
       DEVMETHOD(bus_write_ivar,           acpi_write_ivar),
       DEVMETHOD(bus_set_resource,         acpi_set_resource),
       DEVMETHOD(bus_get_resource,         acpi_get_resource),
       DEVMETHOD(bus_alloc_resource,       acpi_alloc_resource),
       DEVMETHOD(bus_release_resource,     acpi_release_resource),
       DEVMETHOD(bus_driver_added,         bus_generic_driver_added),
       DEVMETHOD(bus_activate_resource,    bus_generic_activate_resource),
       DEVMETHOD(bus_deactivate_resource,  bus_generic_deactivate_resource),
       DEVMETHOD(bus_setup_intr,           bus_generic_setup_intr),
       DEVMETHOD(bus_teardown_intr,        bus_generic_teardown_intr),
   
       /* ISA emulation */
       DEVMETHOD(isa_pnp_probe,            acpi_isa_pnp_probe),
   
       {0, 0}
   };
   
   static driver_t acpi_driver = {
       "acpi",
       acpi_methods,
       sizeof(struct acpi_softc),
   };
   
   static devclass_t acpi_devclass;
   DRIVER_MODULE(acpi, nexus, acpi_driver, acpi_devclass, acpi_modevent, 0);
   MODULE_VERSION(acpi, 100);
   
   SYSCTL_NODE(_debug, OID_AUTO, acpi, CTLFLAG_RW, NULL, "ACPI debugging");
   static char acpi_ca_version[12];
   SYSCTL_STRING(_debug_acpi, OID_AUTO, acpi_ca_version, CTLFLAG_RD,
                 acpi_ca_version, 0, "Version of Intel ACPI-CA");
   
   /*
    * ACPI can only be loaded as a module by the loader; activating it after
    * system bootstrap time is not useful, and can be fatal to the system.
    * It also cannot be unloaded, since the entire system bus heirarchy hangs
    * off it.
    */
   static int
   acpi_modevent(struct module *mod, int event, void *junk)
   {
       switch(event) {
       case MOD_LOAD:
           if (!cold) {
               printf("The ACPI driver cannot be loaded after boot.\n");
               return (EPERM);
           }
           break;
       case MOD_UNLOAD:
           if (!cold && power_pm_get_type() == POWER_PM_TYPE_ACPI)
               return (EBUSY);
           break;
       default:
           break;
       }
       return (0);
   }
   
   /*
    * Detect ACPI, perform early initialisation
    */
   static void
   acpi_identify(driver_t *driver, device_t parent)
   {
       device_t    child;
       int         error;
   #ifdef ACPI_DEBUGGER
       char        *debugpoint;
   #endif
   
       ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
   
       if (!cold)
           return_VOID;
   
       /* Check that we haven't been disabled with a hint. */
       if (resource_disabled("acpi", 0))
           return_VOID;
   
       snprintf(acpi_ca_version, sizeof(acpi_ca_version), "0x%x",
                ACPI_CA_VERSION);
   
       /* Make sure we're not being doubly invoked. */
       if (device_find_child(parent, "acpi", 0) != NULL)
           return_VOID;
   
   #if __FreeBSD_version >= 500000
       /* Initialise the ACPI mutex */
       mtx_init(&acpi_mutex, "ACPI global lock", NULL, MTX_DEF);
   #endif
   
       /* Start up the ACPI CA subsystem. */
   #ifdef ACPI_DEBUGGER
       debugpoint = getenv("debug.acpi.debugger");
       if (debugpoint) {
           if (!strcmp(debugpoint, "init"))
               acpi_EnterDebugger();
           freeenv(debugpoint);
       }
   #endif
       if (ACPI_FAILURE(error = AcpiInitializeSubsystem())) {
           printf("ACPI: initialisation failed: %s\n", AcpiFormatException(error));
           return_VOID;
       }
   #ifdef ACPI_DEBUGGER
       debugpoint = getenv("debug.acpi.debugger");
       if (debugpoint) {
           if (!strcmp(debugpoint, "tables"))
               acpi_EnterDebugger();
           freeenv(debugpoint);
       }
   #endif
   
       if (ACPI_FAILURE(error = AcpiLoadTables())) {
           printf("ACPI: table load failed: %s\n", AcpiFormatException(error));
           return_VOID;
       }
       
       /* Attach the actual ACPI device. */
       if ((child = BUS_ADD_CHILD(parent, 0, "acpi", 0)) == NULL) {
           device_printf(parent, "ACPI: could not attach\n");
           return_VOID;
       }
   }
   
   /*
    * Fetch some descriptive data from ACPI to put in our attach message
    */
   static int
   acpi_probe(device_t dev)
   {
       ACPI_TABLE_HEADER   th;
       char                buf[20];
       ACPI_STATUS         status;
       int                 error;
       ACPI_LOCK_DECL;
   
       ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
   
       if (power_pm_get_type() != POWER_PM_TYPE_NONE &&
           power_pm_get_type() != POWER_PM_TYPE_ACPI) {
   
           device_printf(dev, "Other PM system enabled.\n");
           return_VALUE(ENXIO);
       }
   
       ACPI_LOCK;
   
       if (ACPI_FAILURE(status = AcpiGetTableHeader(ACPI_TABLE_XSDT, 1, &th))) {
           device_printf(dev, "couldn't get XSDT header: %s\n",
                         AcpiFormatException(status));
           error = ENXIO;
       } else {
           sprintf(buf, "%.6s %.8s", th.OemId, th.OemTableId);
           device_set_desc_copy(dev, buf);
           error = 0;
       }
       ACPI_UNLOCK;
       return_VALUE(error);
   }
   
   static int
   acpi_attach(device_t dev)
   {
       struct acpi_softc   *sc;
       ACPI_STATUS         status;
       int                 error;
       UINT32              flags;
       char                *env;
   #ifdef ACPI_DEBUGGER
       char                *debugpoint;
   #endif
       ACPI_LOCK_DECL;
   
       ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
       ACPI_LOCK;
       sc = device_get_softc(dev);
       bzero(sc, sizeof(*sc));
       sc->acpi_dev = dev;
   
   #ifdef ACPI_DEBUGGER
       debugpoint = getenv("debug.acpi.debugger");
       if (debugpoint) {
           if (!strcmp(debugpoint, "spaces"))
               acpi_EnterDebugger();
           freeenv(debugpoint);
       }
   #endif
   
       /* Install the default address space handlers. */
       error = ENXIO;
       status = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
                   ACPI_ADR_SPACE_SYSTEM_MEMORY, ACPI_DEFAULT_HANDLER, NULL, NULL);
       if (ACPI_FAILURE(status)) {
           device_printf(dev, "Could not initialise SystemMemory handler: %s\n",
                         AcpiFormatException(status));
           goto out;
       }
       status = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
                   ACPI_ADR_SPACE_SYSTEM_IO, ACPI_DEFAULT_HANDLER, NULL, NULL);
       if (ACPI_FAILURE(status)) {
           device_printf(dev, "Could not initialise SystemIO handler: %s\n",
                         AcpiFormatException(status));
           goto out;
       }
       status = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
                   ACPI_ADR_SPACE_PCI_CONFIG, ACPI_DEFAULT_HANDLER, NULL, NULL);
       if (ACPI_FAILURE(status)) {
           device_printf(dev, "could not initialise PciConfig handler: %s\n",
                         AcpiFormatException(status));
           goto out;
       }
   
       /*
        * Bring ACPI fully online.
        *
        * Note that some systems (specifically, those with namespace evaluation
        * issues that require the avoidance of parts of the namespace) must
        * avoid running _INI and _STA on everything, as well as dodging the final
        * object init pass.
        *
        * For these devices, we set ACPI_NO_DEVICE_INIT and ACPI_NO_OBJECT_INIT).
        *
        * XXX We should arrange for the object init pass after we have attached
        *     all our child devices, but on many systems it works here.
        */
   #ifdef ACPI_DEBUGGER
       debugpoint = getenv("debug.acpi.debugger");
       if (debugpoint) {
           if (!strcmp(debugpoint, "enable"))
               acpi_EnterDebugger();
           freeenv(debugpoint);
       }
   #endif
       flags = 0;
       if (testenv("debug.acpi.avoid"))
           flags = ACPI_NO_DEVICE_INIT | ACPI_NO_OBJECT_INIT;
       if (ACPI_FAILURE(status = AcpiEnableSubsystem(flags))) {
           device_printf(dev, "Could not enable ACPI: %s\n",
                         AcpiFormatException(status));
           goto out;
       }
   
       /*
        * Call the ECDT probe function to provide EC functionality before
        * the namespace has been evaluated.
        */
       acpi_ec_ecdt_probe(dev);
   
       if (ACPI_FAILURE(status = AcpiInitializeObjects(flags))) {
           device_printf(dev, "Could not initialize ACPI objects: %s\n",
                         AcpiFormatException(status));
           goto out;
       }
   
       /*
        * Setup our sysctl tree.
        *
        * XXX: This doesn't check to make sure that none of these fail.
        */
       sysctl_ctx_init(&sc->acpi_sysctl_ctx);
       sc->acpi_sysctl_tree = SYSCTL_ADD_NODE(&sc->acpi_sysctl_ctx,
                                  SYSCTL_STATIC_CHILDREN(_hw), OID_AUTO,
                                  device_get_name(dev), CTLFLAG_RD, 0, "");
       SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
           OID_AUTO, "supported_sleep_state", CTLTYPE_STRING | CTLFLAG_RD,
           0, 0, acpi_supported_sleep_state_sysctl, "A", "");
       SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
           OID_AUTO, "power_button_state", CTLTYPE_STRING | CTLFLAG_RW,
           &sc->acpi_power_button_sx, 0, acpi_sleep_state_sysctl, "A", "");
       SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
           OID_AUTO, "sleep_button_state", CTLTYPE_STRING | CTLFLAG_RW,
           &sc->acpi_sleep_button_sx, 0, acpi_sleep_state_sysctl, "A", "");
       SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
           OID_AUTO, "lid_switch_state", CTLTYPE_STRING | CTLFLAG_RW,
           &sc->acpi_lid_switch_sx, 0, acpi_sleep_state_sysctl, "A", "");
       SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
           OID_AUTO, "standby_state", CTLTYPE_STRING | CTLFLAG_RW,
           &sc->acpi_standby_sx, 0, acpi_sleep_state_sysctl, "A", "");
       SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
           OID_AUTO, "suspend_state", CTLTYPE_STRING | CTLFLAG_RW,
           &sc->acpi_suspend_sx, 0, acpi_sleep_state_sysctl, "A", "");
       SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
           OID_AUTO, "sleep_delay", CTLFLAG_RD | CTLFLAG_RW,
           &sc->acpi_sleep_delay, 0, "sleep delay");
       SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
           OID_AUTO, "s4bios", CTLFLAG_RD | CTLFLAG_RW,
           &sc->acpi_s4bios, 0, "S4BIOS mode");
       SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
           OID_AUTO, "verbose", CTLFLAG_RD | CTLFLAG_RW,
           &sc->acpi_verbose, 0, "verbose mode");
       SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
           OID_AUTO, "disable_on_poweroff", CTLFLAG_RD | CTLFLAG_RW,
           &sc->acpi_disable_on_poweroff, 0, "ACPI subsystem disable on poweroff");
   
       /*
        * Default to 5 seconds before sleeping to give some machines time to
        * stabilize.
        */
       sc->acpi_sleep_delay = 5;
       sc->acpi_disable_on_poweroff = 1;
       if (bootverbose)
           sc->acpi_verbose = 1;
       if ((env = getenv("hw.acpi.verbose")) && strcmp(env, "")) {
           sc->acpi_verbose = 1;
           freeenv(env);
       }
   
       /* Only enable S4BIOS by default if the FACS says it is available. */
       if (AcpiGbl_FACS->S4Bios_f != 0)
               sc->acpi_s4bios = 1;
   
       /*
        * Dispatch the default sleep state to devices.
        * TBD: should be configured from userland policy manager.
        */
       sc->acpi_power_button_sx = ACPI_POWER_BUTTON_DEFAULT_SX;
       sc->acpi_sleep_button_sx = ACPI_SLEEP_BUTTON_DEFAULT_SX;
       sc->acpi_lid_switch_sx = ACPI_LID_SWITCH_DEFAULT_SX;
       sc->acpi_standby_sx = ACPI_STATE_S1;
       sc->acpi_suspend_sx = ACPI_STATE_S3;
   
       acpi_enable_fixed_events(sc);
   
       /*
        * Scan the namespace and attach/initialise children.
        */
   #ifdef ACPI_DEBUGGER
       debugpoint = getenv("debug.acpi.debugger");
       if (debugpoint) {
           if (!strcmp(debugpoint, "probe"))
               acpi_EnterDebugger();
           freeenv(debugpoint);
       }
   #endif
   
       /* Register our shutdown handlers */
       EVENTHANDLER_REGISTER(shutdown_pre_sync, acpi_shutdown_pre_sync, sc,
           SHUTDOWN_PRI_LAST);
       EVENTHANDLER_REGISTER(shutdown_final, acpi_shutdown_final, sc,
           SHUTDOWN_PRI_LAST);
   
       /*
        * Register our acpi event handlers.
        * XXX should be configurable eg. via userland policy manager.
        */
       EVENTHANDLER_REGISTER(acpi_sleep_event, acpi_system_eventhandler_sleep,
           sc, ACPI_EVENT_PRI_LAST);
       EVENTHANDLER_REGISTER(acpi_wakeup_event, acpi_system_eventhandler_wakeup,
           sc, ACPI_EVENT_PRI_LAST);
   
       /* Flag our initial states. */
       sc->acpi_enabled = 1;
       sc->acpi_sstate = ACPI_STATE_S0;
       sc->acpi_sleep_disabled = 0;
   
       /* Create the control device */
       sc->acpi_dev_t = make_dev(&acpi_cdevsw, 0, UID_ROOT, GID_WHEEL, 0644,
                                 "acpi");
       sc->acpi_dev_t->si_drv1 = sc;
   
   #ifdef ACPI_DEBUGGER
       debugpoint = getenv("debug.acpi.debugger");
       if (debugpoint) {
           if (strcmp(debugpoint, "running") == 0)
               acpi_EnterDebugger();
           freeenv(debugpoint);
       }
   #endif
   
   #ifdef ACPI_USE_THREADS
       if ((error = acpi_task_thread_init()))
           goto out;
   #endif
   
       if ((error = acpi_machdep_init(dev)))
           goto out;
   
       /* Register ACPI again to pass the correct argument of pm_func. */
       power_pm_register(POWER_PM_TYPE_ACPI, acpi_pm_func, sc);
   
       if (!acpi_disabled("bus"))
           acpi_probe_children(dev);
   
       error = 0;
   
    out:
       ACPI_UNLOCK;
       return_VALUE (error);
   }
   
   /*
    * Handle a new device being added
    */
   static device_t
   acpi_add_child(device_t bus, int order, const char *name, int unit)
   {
       struct acpi_device  *ad;
       device_t            child;
   
       if ((ad = malloc(sizeof(*ad), M_ACPIDEV, M_NOWAIT | M_ZERO)) == NULL)
           return (NULL);
   
       resource_list_init(&ad->ad_rl);
       
       child = device_add_child_ordered(bus, order, name, unit);
       if (child != NULL)
           device_set_ivars(child, ad);
       return (child);
   }
   
   static int
   acpi_print_child(device_t bus, device_t child)
   {
       struct acpi_device   *adev = device_get_ivars(child);
       struct resource_list *rl = &adev->ad_rl;
       int retval = 0;
   
       retval += bus_print_child_header(bus, child);
       retval += resource_list_print_type(rl, "port",  SYS_RES_IOPORT, "%#lx");
       retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
       retval += resource_list_print_type(rl, "irq",   SYS_RES_IRQ,    "%ld");
       retval += resource_list_print_type(rl, "drq",   SYS_RES_DRQ,    "%ld");
       retval += bus_print_child_footer(bus, child);
   
       return (retval);
   }
   
   
   /*
    * Handle per-device ivars
    */
   static int
   acpi_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
   {
       struct acpi_device  *ad;
   
       if ((ad = device_get_ivars(child)) == NULL) {
           printf("device has no ivars\n");
           return (ENOENT);
       }
   
       /* ACPI and ISA compatibility ivars */
       switch(index) {
       case ACPI_IVAR_HANDLE:
           *(ACPI_HANDLE *)result = ad->ad_handle;
           break;
       case ACPI_IVAR_MAGIC:
           *(int *)result = ad->ad_magic;
           break;
       case ACPI_IVAR_PRIVATE:
           *(void **)result = ad->ad_private;
           break;
       case ISA_IVAR_VENDORID:
       case ISA_IVAR_SERIAL:
       case ISA_IVAR_COMPATID:
           *(int *)result = -1;
           break;
       case ISA_IVAR_LOGICALID:
           *(int *)result = acpi_isa_get_logicalid(child);
           break;
       default:
           return (ENOENT);
       }
   
       return (0);
   }
   
   static int
   acpi_write_ivar(device_t dev, device_t child, int index, uintptr_t value)
   {
       struct acpi_device  *ad;
   
       if ((ad = device_get_ivars(child)) == NULL) {
           printf("device has no ivars\n");
           return (ENOENT);
       }
   
       switch(index) {
       case ACPI_IVAR_HANDLE:
           ad->ad_handle = (ACPI_HANDLE)value;
           break;
       case ACPI_IVAR_MAGIC:
           ad->ad_magic = (int)value;
           break;
       case ACPI_IVAR_PRIVATE:
           ad->ad_private = (void *)value;
           break;
       default:
           panic("bad ivar write request (%d)", index);
           return (ENOENT);
       }
   
       return (0);
   }
   
   ACPI_HANDLE
   acpi_get_handle(device_t dev)
   {
       uintptr_t up;
       ACPI_HANDLE h;
   
       if (BUS_READ_IVAR(device_get_parent(dev), dev, ACPI_IVAR_HANDLE, &up))
           return(NULL);
       h = (ACPI_HANDLE)up;
       return (h);
   }
               
   int
   acpi_set_handle(device_t dev, ACPI_HANDLE h)
   {
       uintptr_t up;
   
       up = (uintptr_t)h;
       return (BUS_WRITE_IVAR(device_get_parent(dev), dev, ACPI_IVAR_HANDLE, up));
   }
               
   int
   acpi_get_magic(device_t dev)
   {
       uintptr_t up;
       int m;
   
       if (BUS_READ_IVAR(device_get_parent(dev), dev, ACPI_IVAR_MAGIC, &up))
           return(0);
       m = (int)up;
       return (m);
   }
   
   int
   acpi_set_magic(device_t dev, int m)
   {
       uintptr_t up;
   
       up = (uintptr_t)m;
       return (BUS_WRITE_IVAR(device_get_parent(dev), dev, ACPI_IVAR_MAGIC, up));
   }
   
   void *
   acpi_get_private(device_t dev)
   {
       uintptr_t up;
       void *p;
   
       if (BUS_READ_IVAR(device_get_parent(dev), dev, ACPI_IVAR_PRIVATE, &up))
           return (NULL);
       p = (void *)up;
       return (p);
   }
   
   int
   acpi_set_private(device_t dev, void *p)
   {
       uintptr_t up;
   
       up = (uintptr_t)p;
       return (BUS_WRITE_IVAR(device_get_parent(dev), dev, ACPI_IVAR_PRIVATE, up));
   }
   
   ACPI_OBJECT_TYPE
   acpi_get_type(device_t dev)
   {
       ACPI_HANDLE         h;
       ACPI_OBJECT_TYPE    t;
   
       if ((h = acpi_get_handle(dev)) == NULL)
           return (ACPI_TYPE_NOT_FOUND);
       if (AcpiGetType(h, &t) != AE_OK)
           return (ACPI_TYPE_NOT_FOUND);
       return (t);
   }
   
   /*
    * Handle child resource allocation/removal
    */
   static int
   acpi_set_resource(device_t dev, device_t child, int type, int rid,
                     u_long start, u_long count)
   {
       struct acpi_device          *ad = device_get_ivars(child);
       struct resource_list        *rl = &ad->ad_rl;
   
       resource_list_add(rl, type, rid, start, start + count -1, count);
   
       return(0);
   }
   
   static int
   acpi_get_resource(device_t dev, device_t child, int type, int rid,
                     u_long *startp, u_long *countp)
   {
       struct acpi_device          *ad = device_get_ivars(child);
       struct resource_list        *rl = &ad->ad_rl;
       struct resource_list_entry  *rle;
   
       rle = resource_list_find(rl, type, rid);
       if (!rle)
           return(ENOENT);
           
       if (startp)
           *startp = rle->start;
       if (countp)
           *countp = rle->count;
   
       return (0);
   }
   
   static struct resource *
   acpi_alloc_resource(device_t bus, device_t child, int type, int *rid,
                       u_long start, u_long end, u_long count, u_int flags)
   {
       struct acpi_device *ad = device_get_ivars(child);
       struct resource_list *rl = &ad->ad_rl;
   
       return (resource_list_alloc(rl, bus, child, type, rid, start, end, count,
               flags));
   }
   
   static int
   acpi_release_resource(device_t bus, device_t child, int type, int rid, struct resource *r)
   {
       struct acpi_device *ad = device_get_ivars(child);
       struct resource_list *rl = &ad->ad_rl;
   
       return (resource_list_release(rl, bus, child, type, rid, r));
   }
   
   /* Allocate an IO port or memory resource, given its GAS. */
   struct resource *
   acpi_bus_alloc_gas(device_t dev, int *rid, ACPI_GENERIC_ADDRESS *gas)
   {
       int type;
   
       if (gas == NULL || !ACPI_VALID_ADDRESS(gas->Address) ||
           gas->RegisterBitWidth < 8)
           return (NULL);
   
       switch (gas->AddressSpaceId) {
       case ACPI_ADR_SPACE_SYSTEM_MEMORY:
           type = SYS_RES_MEMORY;
           break;
       case ACPI_ADR_SPACE_SYSTEM_IO:
           type = SYS_RES_IOPORT;
           break;
       default:
           return (NULL);
       }
   
       bus_set_resource(dev, type, *rid, gas->Address, gas->RegisterBitWidth / 8);
       return (bus_alloc_resource(dev, type, rid, 0, ~0, 1, RF_ACTIVE));
   }
   
   /*
    * Handle ISA-like devices probing for a PnP ID to match.
    */
   #define PNP_EISAID(s)                           \
           ((((s[0] - '@') & 0x1f) << 2)           \
            | (((s[1] - '@') & 0x18) >> 3)         \
            | (((s[1] - '@') & 0x07) << 13)        \
            | (((s[2] - '@') & 0x1f) << 8)         \
            | (PNP_HEXTONUM(s[4]) << 16)           \
            | (PNP_HEXTONUM(s[3]) << 20)           \
            | (PNP_HEXTONUM(s[6]) << 24)           \
            | (PNP_HEXTONUM(s[5]) << 28))
   
   static uint32_t
   acpi_isa_get_logicalid(device_t dev)
   {
       ACPI_DEVICE_INFO    *devinfo;
       ACPI_BUFFER         buf;
       ACPI_HANDLE         h;
       ACPI_STATUS         error;
       u_int32_t           pnpid;
       ACPI_LOCK_DECL;
   
       ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
   
       pnpid = 0;
       ACPI_LOCK;
       
       /* Fetch and validate the HID. */
       if ((h = acpi_get_handle(dev)) == NULL)
           return (0);
       buf.Pointer = NULL;
       buf.Length = ACPI_ALLOCATE_BUFFER;
       error = AcpiGetObjectInfo(h, &buf);
       if (ACPI_FAILURE(error))
           return (0);
       devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;
   
       if ((devinfo->Valid & ACPI_VALID_HID) != 0)
           pnpid = PNP_EISAID(devinfo->HardwareId.Value);
   
       AcpiOsFree(buf.Pointer);
       ACPI_UNLOCK;
       return_VALUE (pnpid);
   }
   
   static int
   acpi_isa_get_compatid(device_t dev, uint32_t *cids, int count)
   {
       ACPI_DEVICE_INFO    *devinfo;
       ACPI_BUFFER         buf;
       ACPI_HANDLE         h;
       ACPI_STATUS         error;
       uint32_t            *pnpid;
       int                 valid, i;
       ACPI_LOCK_DECL;
   
       ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
   
       pnpid = cids;
       valid = 0;
       ACPI_LOCK;
       
       /* Fetch and validate the CID */
       if ((h = acpi_get_handle(dev)) == NULL)
           return (0);
       buf.Pointer = NULL;
       buf.Length = ACPI_ALLOCATE_BUFFER;
       error = AcpiGetObjectInfo(h, &buf);
       if (ACPI_FAILURE(error))
           return (0);
       devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;
       if ((devinfo->Valid & ACPI_VALID_CID) == 0)
           goto out;
   
       if (devinfo->CompatibilityId.Count < count)
           count = devinfo->CompatibilityId.Count;
       for (i = 0; i < count; i++) {
           if (strncmp(devinfo->CompatibilityId.Id[i].Value, "PNP", 3) != 0)
               continue;
           *pnpid++ = PNP_EISAID(devinfo->CompatibilityId.Id[i].Value);
           valid++;
       }
   
   out:
       AcpiOsFree(buf.Pointer);
       ACPI_UNLOCK;
       return_VALUE (valid);
   }
   
   static int
   acpi_isa_pnp_probe(device_t bus, device_t child, struct isa_pnp_id *ids)
   {
       int                 result, cid_count, i;
       uint32_t            lid, cids[8];
   
       ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
   
       /*
        * ISA-style drivers attached to ACPI may persist and
        * probe manually if we return ENOENT.  We never want
        * that to happen, so don't ever return it.
        */
       result = ENXIO;
   
       /* Scan the supplied IDs for a match */
       lid = acpi_isa_get_logicalid(child);
       cid_count = acpi_isa_get_compatid(child, cids, 8);
       while (ids && ids->ip_id) {
           if (lid == ids->ip_id) {
               result = 0;
               goto out;
           }
           for (i = 0; i < cid_count; i++) {
               if (cids[i] == ids->ip_id) {
                   result = 0;
                   goto out;
               }
           }
           ids++;
       }
   
    out:
       return_VALUE (result);
   }
   
   /*
    * Scan relevant portions of the ACPI namespace and attach child devices.
    *
    * Note that we only expect to find devices in the \_PR_, \_TZ_, \_SI_ and
    * \_SB_ scopes, and \_PR_ and \_TZ_ become obsolete in the ACPI 2.0 spec.
    */
   static void
   acpi_probe_children(device_t bus)
   {
       ACPI_HANDLE parent;
       ACPI_STATUS status;
       static char *scopes[] = {"\\_PR_", "\\_TZ_", "\\_SI", "\\_SB_", NULL};
       int         i;
   
       ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
       ACPI_ASSERTLOCK;
   
       /* Create any static children by calling device identify methods. */
       ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "device identify routines\n"));
       bus_generic_probe(bus);
   
       /*
        * Scan the namespace and insert placeholders for all the devices that
        * we find.
        *
        * Note that we use AcpiWalkNamespace rather than AcpiGetDevices because
        * we want to create nodes for all devices, not just those that are
        * currently present. (This assumes that we don't want to create/remove
        * devices as they appear, which might be smarter.)
        */
       ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "namespace scan\n"));
       for (i = 0; scopes[i] != NULL; i++) {
           status = AcpiGetHandle(ACPI_ROOT_OBJECT, scopes[i], &parent);
           if (ACPI_SUCCESS(status)) {
               AcpiWalkNamespace(ACPI_TYPE_ANY, parent, 100, acpi_probe_child,
                                 bus, NULL);
           }
       }
   
       /*
        * Scan all of the child devices we have created and let them probe/attach.
        */
       ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "first bus_generic_attach\n"));
       bus_generic_attach(bus);
   
       /*
        * Some of these children may have attached others as part of their attach
        * process (eg. the root PCI bus driver), so rescan.
        */
       ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "second bus_generic_attach\n"));
       bus_generic_attach(bus);
   
       ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "done attaching children\n"));
       return_VOID;
   }
   
   /*
    * Evaluate a child device and determine whether we might attach a device to
    * it.
    */
   static ACPI_STATUS
   acpi_probe_child(ACPI_HANDLE handle, UINT32 level, void *context, void **status)
   {
       ACPI_OBJECT_TYPE    type;
       device_t            child, bus = (device_t)context;
   
       ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
   
       /* Skip this device if we think we'll have trouble with it. */
       if (acpi_avoid(handle))
           return_ACPI_STATUS (AE_OK);
   
       if (ACPI_SUCCESS(AcpiGetType(handle, &type))) {
           switch(type) {
           case ACPI_TYPE_DEVICE:
           case ACPI_TYPE_PROCESSOR:
           case ACPI_TYPE_THERMAL:
           case ACPI_TYPE_POWER:
               if (acpi_disabled("children"))
                   break;
   
               /* 
                * Create a placeholder device for this node.  Sort the placeholder
                * so that the probe/attach passes will run breadth-first.
                */
              ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "scanning '%s'\n",
                               acpi_name(handle)));
              child = BUS_ADD_CHILD(bus, level * 10, NULL, -1);
              if (child == NULL)
                  break;
              acpi_set_handle(child, handle);
  
              /*
               * Check that the device is present.  If it's not present,
               * leave it disabled (so that we have a device_t attached to
               * the handle, but we don't probe it).
               */
              if (type == ACPI_TYPE_DEVICE && !acpi_DeviceIsPresent(child)) {
                  device_disable(child);
                  break;
              }
  
              /*
               * Get the device's resource settings and attach them.
               * Note that if the device has _PRS but no _CRS, we need
               * to decide when it's appropriate to try to configure the
               * device.  Ignore the return value here; it's OK for the
               * device not to have any resources.
               */
              acpi_parse_resources(child, handle, &acpi_res_parse_set);
  
              /* If we're debugging, probe/attach now rather than later */
              ACPI_DEBUG_EXEC(device_probe_and_attach(child));
              break;
          }
      }
  
      return_ACPI_STATUS (AE_OK);
  }
  
  static void
  acpi_shutdown_pre_sync(void *arg, int howto)
  {
      struct acpi_softc *sc = arg;
  
      ACPI_ASSERTLOCK;
  
      /*
       * Disable all ACPI events before soft off, otherwise the system
       * will be turned on again on some laptops.
       *
       * XXX this should probably be restricted to masking some events just
       *     before powering down, since we may still need ACPI during the
       *     shutdown process.
       */
      if (sc->acpi_disable_on_poweroff)
          acpi_Disable(sc);
  }
  
  static void
  acpi_shutdown_final(void *arg, int howto)
  {
      ACPI_STATUS status;
  
      ACPI_ASSERTLOCK;
  
      if ((howto & RB_POWEROFF) != 0) {
          printf("Powering system off using ACPI\n");
          status = AcpiEnterSleepStatePrep(acpi_off_state);
          if (ACPI_FAILURE(status)) {
              printf("AcpiEnterSleepStatePrep failed - %s\n",
                     AcpiFormatException(status));
              return;
          }
          ACPI_DISABLE_IRQS();
          status = AcpiEnterSleepState(acpi_off_state);
          if (ACPI_FAILURE(status)) {
              printf("ACPI power-off failed - %s\n", AcpiFormatException(status));
          } else {
              DELAY(1000000);
              printf("ACPI power-off failed - timeout\n");
          }
      } else {
          printf("Shutting down ACPI\n");
          AcpiTerminate();
      }
  }
  
  static void
  acpi_enable_fixed_events(struct acpi_softc *sc)
  {
      static int  first_time = 1;
  
      ACPI_ASSERTLOCK;
  
      /* Enable and clear fixed events and install handlers. */
      if (AcpiGbl_FADT != NULL && AcpiGbl_FADT->PwrButton == 0) {
          AcpiEnableEvent(ACPI_EVENT_POWER_BUTTON, 0);
          AcpiClearEvent(ACPI_EVENT_POWER_BUTTON);
          AcpiInstallFixedEventHandler(ACPI_EVENT_POWER_BUTTON,
                                       acpi_eventhandler_power_button_for_sleep,
                                       sc);
          if (first_time)
              device_printf(sc->acpi_dev, "Power Button (fixed)\n");
      }
      if (AcpiGbl_FADT != NULL && AcpiGbl_FADT->SleepButton == 0) {
          AcpiEnableEvent(ACPI_EVENT_SLEEP_BUTTON, 0);
          AcpiClearEvent(ACPI_EVENT_SLEEP_BUTTON);
          AcpiInstallFixedEventHandler(ACPI_EVENT_SLEEP_BUTTON,
                                       acpi_eventhandler_sleep_button_for_sleep,
                                       sc);
          if (first_time)
              device_printf(sc->acpi_dev, "Sleep Button (fixed)\n");
      }
  
      first_time = 0;
  }
  
  /*
   * Returns true if the device is actually present and should
   * be attached to.  This requires the present, enabled, UI-visible 
   * and diagnostics-passed bits to be set.
   */
  BOOLEAN
  acpi_DeviceIsPresent(device_t dev)
  {
      ACPI_DEVICE_INFO    *devinfo;
      ACPI_HANDLE         h;
      ACPI_BUFFER         buf;
      ACPI_STATUS         error;
      int                 ret;
  
      ACPI_ASSERTLOCK;
      
      ret = FALSE;
      if ((h = acpi_get_handle(dev)) == NULL)
          return (FALSE);
      buf.Pointer = NULL;
      buf.Length = ACPI_ALLOCATE_BUFFER;
      error = AcpiGetObjectInfo(h, &buf);
      if (ACPI_FAILURE(error))
          return (FALSE);
      devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;
  
      /* If no _STA method, must be present */
      if ((devinfo->Valid & ACPI_VALID_STA) == 0)
          ret = TRUE;
  
      /* Return true for 'present' and 'functioning' */
      if ((devinfo->CurrentStatus & 0x9) == 0x9)
          ret = TRUE;
  
      AcpiOsFree(buf.Pointer);
      return (ret);
  }
  
  /*
   * Returns true if the battery is actually present and inserted.
   */
  BOOLEAN
  acpi_BatteryIsPresent(device_t dev)
  {
      ACPI_DEVICE_INFO    *devinfo;
      ACPI_HANDLE         h;
      ACPI_BUFFER         buf;
      ACPI_STATUS         error;
      int                 ret;
  
      ACPI_ASSERTLOCK;
      
      ret = FALSE;
      if ((h = acpi_get_handle(dev)) == NULL)
          return (FALSE);
      buf.Pointer = NULL;
      buf.Length = ACPI_ALLOCATE_BUFFER;
      error = AcpiGetObjectInfo(h, &buf);
      if (ACPI_FAILURE(error))
          return (FALSE);
      devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;
  
      /* If no _STA method, must be present */
      if ((devinfo->Valid & ACPI_VALID_STA) == 0)
          ret = TRUE;
  
      /* Return true for 'present' and 'functioning' */
      if ((devinfo->CurrentStatus & 0x19) == 0x19)
          ret = TRUE;
  
      AcpiOsFree(buf.Pointer);
      return (ret);
  }
  
  /*
   * Match a HID string against a device
   */
  BOOLEAN
  acpi_MatchHid(device_t dev, char *hid) 
  {
      ACPI_DEVICE_INFO    *devinfo;
      ACPI_HANDLE         h;
      ACPI_BUFFER         buf;
      ACPI_STATUS         error;
      int                 ret, i;
  
      ACPI_ASSERTLOCK;
  
      ret = FALSE;
      if (hid == NULL)
          return (FALSE);
      if ((h = acpi_get_handle(dev)) == NULL)
          return (FALSE);
      buf.Pointer = NULL;
      buf.Length = ACPI_ALLOCATE_BUFFER;
      error = AcpiGetObjectInfo(h, &buf);
      if (ACPI_FAILURE(error))
          return (FALSE);
      devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;
  
      if ((devinfo->Valid & ACPI_VALID_HID) != 0 &&
          strcmp(hid, devinfo->HardwareId.Value) == 0)
              ret = TRUE;
      else if ((devinfo->Valid & ACPI_VALID_CID) != 0) {
          for (i = 0; i < devinfo->CompatibilityId.Count; i++) {
              if (strcmp(hid, devinfo->CompatibilityId.Id[i].Value) == 0) {
                  ret = TRUE;
                  break;
              }
          }
      }
  
      AcpiOsFree(buf.Pointer);
      return (ret);
  }
  
  /*
   * Return the handle of a named object within our scope, ie. that of (parent)
   * or one if its parents.
   */
  ACPI_STATUS
  acpi_GetHandleInScope(ACPI_HANDLE parent, char *path, ACPI_HANDLE *result)
  {
      ACPI_HANDLE         r;
      ACPI_STATUS         status;
  
      ACPI_ASSERTLOCK;
  
      /* Walk back up the tree to the root */
      for (;;) {
          status = AcpiGetHandle(parent, path, &r);
          if (ACPI_SUCCESS(status)) {
              *result = r;
              return (AE_OK);
          }
          if (status != AE_NOT_FOUND)
              return (AE_OK);
          if (ACPI_FAILURE(AcpiGetParent(parent, &r)))
              return (AE_NOT_FOUND);
          parent = r;
      }
  }
  
  /*
   * Allocate a buffer with a preset data size.
   */
  ACPI_BUFFER *
  acpi_AllocBuffer(int size)
  {
      ACPI_BUFFER *buf;
  
      if ((buf = malloc(size + sizeof(*buf), M_ACPIDEV, M_NOWAIT)) == NULL)
          return (NULL);
      buf->Length = size;
      buf->Pointer = (void *)(buf + 1);
      return (buf);
  }
  
  /*
   * Evaluate a path that should return an integer.
   */
  ACPI_STATUS
  acpi_EvaluateInteger(ACPI_HANDLE handle, char *path, int *number)
  {
      ACPI_STATUS status;
      ACPI_BUFFER buf;
      ACPI_OBJECT param;
  
      ACPI_ASSERTLOCK;
  
      if (handle == NULL)
          handle = ACPI_ROOT_OBJECT;
  
      /*
       * Assume that what we've been pointed at is an Integer object, or
       * a method that will return an Integer.
       */
      buf.Pointer = &param;
      buf.Length = sizeof(param);
      status = AcpiEvaluateObject(handle, path, NULL, &buf);
      if (ACPI_SUCCESS(status)) {
          if (param.Type == ACPI_TYPE_INTEGER)
              *number = param.Integer.Value;
          else
              status = AE_TYPE;
      }
  
      /* 
       * In some applications, a method that's expected to return an Integer
       * may instead return a Buffer (probably to simplify some internal
       * arithmetic).  We'll try to fetch whatever it is, and if it's a Buffer,
       * convert it into an Integer as best we can.
       *
       * This is a hack.
       */
      if (status == AE_BUFFER_OVERFLOW) {
          if ((buf.Pointer = AcpiOsAllocate(buf.Length)) == NULL) {
              status = AE_NO_MEMORY;
          } else {
              status = AcpiEvaluateObject(handle, path, NULL, &buf);
              if (ACPI_SUCCESS(status))
                  status = acpi_ConvertBufferToInteger(&buf, number);
              AcpiOsFree(buf.Pointer);
          }
      }
      return (status);
  }
  
  ACPI_STATUS
  acpi_ConvertBufferToInteger(ACPI_BUFFER *bufp, int *number)
  {
      ACPI_OBJECT *p;
      int         i;
  
      p = (ACPI_OBJECT *)bufp->Pointer;
      if (p->Type == ACPI_TYPE_INTEGER) {
          *number = p->Integer.Value;
          return (AE_OK);
      }
      if (p->Type != ACPI_TYPE_BUFFER)
          return (AE_TYPE);
      if (p->Buffer.Length > sizeof(int))
          return (AE_BAD_DATA);
  
      *number = 0;
      for (i = 0; i < p->Buffer.Length; i++)
          *number += (*(p->Buffer.Pointer + i) << (i * 8));
      return (AE_OK);
  }
  
  /*
   * Iterate over the elements of an a package object, calling the supplied
   * function for each element.
   *
   * XXX possible enhancement might be to abort traversal on error.
   */
  ACPI_STATUS
  acpi_ForeachPackageObject(ACPI_OBJECT *pkg,
          void (*func)(ACPI_OBJECT *comp, void *arg), void *arg)
  {
      ACPI_OBJECT *comp;
      int         i;
      
      if (pkg == NULL || pkg->Type != ACPI_TYPE_PACKAGE)
          return (AE_BAD_PARAMETER);
  
      /* Iterate over components */
      i = 0;
      comp = pkg->Package.Elements;
      for (; i < pkg->Package.Count; i++, comp++)
          func(comp, arg);
  
      return (AE_OK);
  }
  
  /*
   * Find the (index)th resource object in a set.
   */
  ACPI_STATUS
  acpi_FindIndexedResource(ACPI_BUFFER *buf, int index, ACPI_RESOURCE **resp)
  {
      ACPI_RESOURCE       *rp;
      int                 i;
  
      rp = (ACPI_RESOURCE *)buf->Pointer;
      i = index;
      while (i-- > 0) {
          /* Range check */       
          if (rp > (ACPI_RESOURCE *)((u_int8_t *)buf->Pointer + buf->Length))
              return (AE_BAD_PARAMETER);
  
          /* Check for terminator */
          if (rp->Id == ACPI_RSTYPE_END_TAG || rp->Length == 0)
              return (AE_NOT_FOUND);
          rp = ACPI_RESOURCE_NEXT(rp);
      }
      if (resp != NULL)
          *resp = rp;
  
      return (AE_OK);
  }
  
  /*
   * Append an ACPI_RESOURCE to an ACPI_BUFFER.
   *
   * Given a pointer to an ACPI_RESOURCE structure, expand the ACPI_BUFFER
   * provided to contain it.  If the ACPI_BUFFER is empty, allocate a sensible
   * backing block.  If the ACPI_RESOURCE is NULL, return an empty set of
   * resources.
   */
  #define ACPI_INITIAL_RESOURCE_BUFFER_SIZE       512
  
  ACPI_STATUS
  acpi_AppendBufferResource(ACPI_BUFFER *buf, ACPI_RESOURCE *res)
  {
      ACPI_RESOURCE       *rp;
      void                *newp;
      
      /* Initialise the buffer if necessary. */
      if (buf->Pointer == NULL) {
          buf->Length = ACPI_INITIAL_RESOURCE_BUFFER_SIZE;
          if ((buf->Pointer = AcpiOsAllocate(buf->Length)) == NULL)
              return (AE_NO_MEMORY);
          rp = (ACPI_RESOURCE *)buf->Pointer;
          rp->Id = ACPI_RSTYPE_END_TAG;
          rp->Length = 0;
      }
      if (res == NULL)
          return (AE_OK);
      
      /*
       * Scan the current buffer looking for the terminator.
       * This will either find the terminator or hit the end
       * of the buffer and return an error.
       */
      rp = (ACPI_RESOURCE *)buf->Pointer;
      for (;;) {
          /* Range check, don't go outside the buffer */
          if (rp >= (ACPI_RESOURCE *)((u_int8_t *)buf->Pointer + buf->Length))
              return (AE_BAD_PARAMETER);
          if (rp->Id == ACPI_RSTYPE_END_TAG || rp->Length == 0)
              break;
          rp = ACPI_RESOURCE_NEXT(rp);
      }
  
      /*
       * Check the size of the buffer and expand if required.
       *
       * Required size is:
       *  size of existing resources before terminator + 
       *  size of new resource and header +
       *  size of terminator.
       *
       * Note that this loop should really only run once, unless
       * for some reason we are stuffing a *really* huge resource.
       */
      while ((((u_int8_t *)rp - (u_int8_t *)buf->Pointer) + 
              res->Length + ACPI_RESOURCE_LENGTH_NO_DATA +
              ACPI_RESOURCE_LENGTH) >= buf->Length) {
          if ((newp = AcpiOsAllocate(buf->Length * 2)) == NULL)
              return (AE_NO_MEMORY);
          bcopy(buf->Pointer, newp, buf->Length);
          rp = (ACPI_RESOURCE *)((u_int8_t *)newp +
                                 ((u_int8_t *)rp - (u_int8_t *)buf->Pointer));
          AcpiOsFree(buf->Pointer);
          buf->Pointer = newp;
          buf->Length += buf->Length;
      }
      
      /* Insert the new resource. */
      bcopy(res, rp, res->Length + ACPI_RESOURCE_LENGTH_NO_DATA);
      
      /* And add the terminator. */
      rp = ACPI_RESOURCE_NEXT(rp);
      rp->Id = ACPI_RSTYPE_END_TAG;
      rp->Length = 0;
  
      return (AE_OK);
  }
  
  /*
   * Set interrupt model.
   */
  ACPI_STATUS
  acpi_SetIntrModel(int model)
  {
      ACPI_OBJECT_LIST ArgList;
      ACPI_OBJECT Arg;
  
      Arg.Type = ACPI_TYPE_INTEGER;
      Arg.Integer.Value = model;
      ArgList.Count = 1;
      ArgList.Pointer = &Arg;
      return (AcpiEvaluateObject(ACPI_ROOT_OBJECT, "_PIC", &ArgList, NULL));
  }
  
  #define ACPI_MINIMUM_AWAKETIME  5
  
  static void
  acpi_sleep_enable(void *arg)
  {
      ((struct acpi_softc *)arg)->acpi_sleep_disabled = 0;
  }
  
  /*
   * Set the system sleep state
   *
   * Currently we support S1-S5 but S4 is only S4BIOS
   */
  ACPI_STATUS
  acpi_SetSleepState(struct acpi_softc *sc, int state)
  {
      ACPI_STATUS status = AE_OK;
      UINT8       TypeA;
      UINT8       TypeB;
  
      ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, state);
      ACPI_ASSERTLOCK;
  
      /* Avoid reentry if already attempting to suspend. */
      if (sc->acpi_sstate != ACPI_STATE_S0)
          return_ACPI_STATUS (AE_BAD_PARAMETER);
  
      /* We recently woke up so don't suspend again for a while. */
      if (sc->acpi_sleep_disabled)
          return_ACPI_STATUS (AE_OK);
  
      switch (state) {
      case ACPI_STATE_S1:
      case ACPI_STATE_S2:
      case ACPI_STATE_S3:
      case ACPI_STATE_S4:
          status = AcpiGetSleepTypeData((UINT8)state, &TypeA, &TypeB);
          if (status == AE_NOT_FOUND) {
              device_printf(sc->acpi_dev,
                            "Sleep state S%d not supported by BIOS\n", state);
              break;
          } else if (ACPI_FAILURE(status)) {
              device_printf(sc->acpi_dev, "AcpiGetSleepTypeData failed - %s\n",
                            AcpiFormatException(status));
              break;
          }
  
          sc->acpi_sstate = state;
          sc->acpi_sleep_disabled = 1;
  
          /* Inform all devices that we are going to sleep. */
          if (DEVICE_SUSPEND(root_bus) != 0) {
              /*
               * Re-wake the system.
               *
               * XXX note that a better two-pass approach with a 'veto' pass
               *     followed by a "real thing" pass would be better, but the
               *     current bus interface does not provide for this.
               */
              DEVICE_RESUME(root_bus);
              return_ACPI_STATUS (AE_ERROR);
          }
  
          status = AcpiEnterSleepStatePrep(state);
          if (ACPI_FAILURE(status)) {
              device_printf(sc->acpi_dev, "AcpiEnterSleepStatePrep failed - %s\n",
                            AcpiFormatException(status));
              break;
          }
  
          if (sc->acpi_sleep_delay > 0)
              DELAY(sc->acpi_sleep_delay * 1000000);
  
          if (state != ACPI_STATE_S1) {
              acpi_sleep_machdep(sc, state);
  
              /* AcpiEnterSleepState() may be incomplete, unlock if locked. */
              if (AcpiGbl_MutexInfo[ACPI_MTX_HARDWARE].OwnerId !=
                  ACPI_MUTEX_NOT_ACQUIRED) {
  
                  AcpiUtReleaseMutex(ACPI_MTX_HARDWARE);
              }
  
              /* Re-enable ACPI hardware on wakeup from sleep state 4. */
              if (state == ACPI_STATE_S4)
                  AcpiEnable();
          } else {
              status = AcpiEnterSleepState((UINT8)state);
              if (ACPI_FAILURE(status)) {
                  device_printf(sc->acpi_dev, "AcpiEnterSleepState failed - %s\n",
                                AcpiFormatException(status));
                  break;
              }
          }
          AcpiLeaveSleepState((UINT8)state);
          DEVICE_RESUME(root_bus);
          sc->acpi_sstate = ACPI_STATE_S0;
          acpi_enable_fixed_events(sc);
          break;
      case ACPI_STATE_S5:
          /*
           * Shut down cleanly and power off.  This will call us back through the
           * shutdown handlers.
           */
          shutdown_nice(RB_POWEROFF);
          break;
      case ACPI_STATE_S0:
      default:
          status = AE_BAD_PARAMETER;
          break;
      }
  
      /* Disable a second sleep request for a short period */
      if (sc->acpi_sleep_disabled)
          timeout(acpi_sleep_enable, (caddr_t)sc, hz * ACPI_MINIMUM_AWAKETIME);
  
      return_ACPI_STATUS (status);
  }
  
  /*
   * Enable/Disable ACPI
   */
  ACPI_STATUS
  acpi_Enable(struct acpi_softc *sc)
  {
      ACPI_STATUS status;
      u_int32_t   flags;
  
      ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
      ACPI_ASSERTLOCK;
  
      flags = ACPI_NO_ADDRESS_SPACE_INIT | ACPI_NO_HARDWARE_INIT |
              ACPI_NO_DEVICE_INIT | ACPI_NO_OBJECT_INIT;
      if (!sc->acpi_enabled)
          status = AcpiEnableSubsystem(flags);
      else
          status = AE_OK;
  
      if (status == AE_OK)
          sc->acpi_enabled = 1;
  
      return_ACPI_STATUS (status);
  }
  
  ACPI_STATUS
  acpi_Disable(struct acpi_softc *sc)
  {
      ACPI_STATUS status;
  
      ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
      ACPI_ASSERTLOCK;
  
      if (sc->acpi_enabled)
          status = AcpiDisable();
      else
          status = AE_OK;
  
      if (status == AE_OK)
          sc->acpi_enabled = 0;
  
      return_ACPI_STATUS (status);
  }
  
  /*
   * ACPI Event Handlers
   */
  
  /* System Event Handlers (registered by EVENTHANDLER_REGISTER) */
  
  static void
  acpi_system_eventhandler_sleep(void *arg, int state)
  {
      ACPI_LOCK_DECL;
      ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, state);
  
      ACPI_LOCK;
      if (state >= ACPI_STATE_S0 && state <= ACPI_S_STATES_MAX)
          acpi_SetSleepState((struct acpi_softc *)arg, state);
      ACPI_UNLOCK;
      return_VOID;
  }
  
  static void
  acpi_system_eventhandler_wakeup(void *arg, int state)
  {
      ACPI_LOCK_DECL;
      ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, state);
  
      /* Well, what to do? :-) */
  
      ACPI_LOCK;
      ACPI_UNLOCK;
  
      return_VOID;
  }
  
  /* 
   * ACPICA Event Handlers (FixedEvent, also called from button notify handler)
   */
  UINT32
  acpi_eventhandler_power_button_for_sleep(void *context)
  {
      struct acpi_softc   *sc = (struct acpi_softc *)context;
  
      ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  
      EVENTHANDLER_INVOKE(acpi_sleep_event, sc->acpi_power_button_sx);
  
      return_VALUE (ACPI_INTERRUPT_HANDLED);
  }
  
  UINT32
  acpi_eventhandler_power_button_for_wakeup(void *context)
  {
      struct acpi_softc   *sc = (struct acpi_softc *)context;
  
      ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  
      EVENTHANDLER_INVOKE(acpi_wakeup_event, sc->acpi_power_button_sx);
  
      return_VALUE (ACPI_INTERRUPT_HANDLED);
  }
  
  UINT32
  acpi_eventhandler_sleep_button_for_sleep(void *context)
  {
      struct acpi_softc   *sc = (struct acpi_softc *)context;
  
      ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  
      EVENTHANDLER_INVOKE(acpi_sleep_event, sc->acpi_sleep_button_sx);
  
      return_VALUE (ACPI_INTERRUPT_HANDLED);
  }
  
  UINT32
  acpi_eventhandler_sleep_button_for_wakeup(void *context)
  {
      struct acpi_softc   *sc = (struct acpi_softc *)context;
  
      ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  
      EVENTHANDLER_INVOKE(acpi_wakeup_event, sc->acpi_sleep_button_sx);
  
      return_VALUE (ACPI_INTERRUPT_HANDLED);
  }
  
  /*
   * XXX This is kinda ugly, and should not be here.
   */
  struct acpi_staticbuf {
      ACPI_BUFFER buffer;
      char        data[512];
  };
  
  char *
  acpi_name(ACPI_HANDLE handle)
  {
      static struct acpi_staticbuf        buf;
  
      ACPI_ASSERTLOCK;
  
      buf.buffer.Length = 512;
      buf.buffer.Pointer = &buf.data[0];
  
      if (ACPI_SUCCESS(AcpiGetName(handle, ACPI_FULL_PATHNAME, &buf.buffer)))
          return (buf.buffer.Pointer);
  
      return ("(unknown path)");
  }
  
  /*
   * Debugging/bug-avoidance.  Avoid trying to fetch info on various
   * parts of the namespace.
   */
  int
  acpi_avoid(ACPI_HANDLE handle)
  {
      char        *cp, *env, *np;
      int         len;
  
      np = acpi_name(handle);
      if (*np == '\\')
          np++;
      if ((env = getenv("debug.acpi.avoid")) == NULL)
          return (0);
  
      /* Scan the avoid list checking for a match */
      cp = env;
      for (;;) {
          while ((*cp != 0) && isspace(*cp))
              cp++;
          if (*cp == 0)
              break;
          len = 0;
          while ((cp[len] != 0) && !isspace(cp[len]))
              len++;
          if (!strncmp(cp, np, len)) {
              freeenv(env);
              return(1);
          }
          cp += len;
      }
      freeenv(env);
  
      return (0);
  }
  
  /*
   * Debugging/bug-avoidance.  Disable ACPI subsystem components.
   */
  int
  acpi_disabled(char *subsys)
  {
      char        *cp, *env;
      int         len;
  
      if ((env = getenv("debug.acpi.disable")) == NULL)
          return (0);
      if (!strcmp(env, "all")) {
          freeenv(env);
          return (1);
      }
  
      /* scan the disable list checking for a match */
      cp = env;
      for (;;) {
          while ((*cp != 0) && isspace(*cp))
              cp++;
          if (*cp == 0)
              break;
          len = 0;
          while ((cp[len] != 0) && !isspace(cp[len]))
              len++;
          if (!strncmp(cp, subsys, len)) {
              freeenv(env);
              return (1);
          }
          cp += len;
      }
      freeenv(env);
  
      return (0);
  }
  
  /*
   * Device wake capability enable/disable.
   */
  void
  acpi_device_enable_wake_capability(ACPI_HANDLE h, int enable)
  {
      ACPI_OBJECT_LIST            ArgList;
      ACPI_OBJECT                 Arg;
  
      /*
       * TBD: All Power Resources referenced by elements 2 through N
       *      of the _PRW object are put into the ON state.
       */
  
      ArgList.Count = 1;
      ArgList.Pointer = &Arg;
  
      Arg.Type = ACPI_TYPE_INTEGER;
      Arg.Integer.Value = enable;
  
      (void)AcpiEvaluateObject(h, "_PSW", &ArgList, NULL);
  }
  
  void
  acpi_device_enable_wake_event(ACPI_HANDLE h)
  {
      struct acpi_softc           *sc;
      ACPI_STATUS                 status;
      ACPI_BUFFER                 prw_buffer;
      ACPI_OBJECT                 *res;
  
      ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  
      sc = devclass_get_softc(acpi_devclass, 0);
      if (sc == NULL)
          return;
  
      /*
       * _PRW object is only required for devices that have the ability
       * to wake the system from a system sleeping state.
       */
      prw_buffer.Length = ACPI_ALLOCATE_BUFFER;
      status = AcpiEvaluateObject(h, "_PRW", NULL, &prw_buffer);
      if (ACPI_FAILURE(status))
          return;
  
      res = (ACPI_OBJECT *)prw_buffer.Pointer;
      if (res == NULL)
          return;
  
      if ((res->Type != ACPI_TYPE_PACKAGE) || (res->Package.Count < 2)) {
          goto out;
      }
  
      /*
       * The element 1 of the _PRW object:
       * The lowest power system sleeping state that can be entered
       * while still providing wake functionality.
       * The sleeping state being entered must be greater or equal to
       * the power state declared in element 1 of the _PRW object.
       */
      if (res->Package.Elements[1].Type != ACPI_TYPE_INTEGER)
          goto out;
  
      if (sc->acpi_sstate > res->Package.Elements[1].Integer.Value)
          goto out;
  
      /*
       * The element 0 of the _PRW object:
       */
      switch(res->Package.Elements[0].Type) {
      case ACPI_TYPE_INTEGER:
          /* 
           * If the data type of this package element is numeric, then this
           * _PRW package element is the bit index in the GPEx_EN, in the
           * GPE blocks described in the FADT, of the enable bit that is
           * enabled for the wake event.
           */
  
          status = AcpiEnableGpe(NULL, res->Package.Elements[0].Integer.Value,
                                 ACPI_EVENT_WAKE_ENABLE);
          if (ACPI_FAILURE(status))
              printf("%s: EnableEvent Failed\n", __func__);
          break;
      case ACPI_TYPE_PACKAGE:
          /*
           * XXX TBD
           *
           * If the data type of this package element is a package, then this
           * _PRW package element is itself a package containing two
           * elements. The first is an object reference to the GPE Block
           * device that contains the GPE that will be triggered by the wake
           * event. The second element is numeric and it contains the bit
           * index in the GPEx_EN, in the GPE Block referenced by the
           * first element in the package, of the enable bit that is enabled for
           * the wake event.
           * For example, if this field is a package then it is of the form:
           * Package() {\_SB.PCI0.ISA.GPE, 2}
           */
          break;
      default:
          break;
      }
  
  out:
      if (prw_buffer.Pointer != NULL)
          AcpiOsFree(prw_buffer.Pointer);
  }
  
  /*
   * Control interface.
   *
   * We multiplex ioctls for all participating ACPI devices here.  Individual 
   * drivers wanting to be accessible via /dev/acpi should use the
   * register/deregister interface to make their handlers visible.
   */
  struct acpi_ioctl_hook
  {
      TAILQ_ENTRY(acpi_ioctl_hook) link;
      u_long                       cmd;
      acpi_ioctl_fn                fn;
      void                         *arg;
  };
  
  static TAILQ_HEAD(,acpi_ioctl_hook)     acpi_ioctl_hooks;
  static int                              acpi_ioctl_hooks_initted;
  
  /*
   * Register an ioctl handler.
   */
  int
  acpi_register_ioctl(u_long cmd, acpi_ioctl_fn fn, void *arg)
  {
      struct acpi_ioctl_hook      *hp;
  
      if ((hp = malloc(sizeof(*hp), M_ACPIDEV, M_NOWAIT)) == NULL)
          return (ENOMEM);
      hp->cmd = cmd;
      hp->fn = fn;
      hp->arg = arg;
      if (acpi_ioctl_hooks_initted == 0) {
          TAILQ_INIT(&acpi_ioctl_hooks);
          acpi_ioctl_hooks_initted = 1;
      }
      TAILQ_INSERT_TAIL(&acpi_ioctl_hooks, hp, link);
      return (0);
  }
  
  /*
   * Deregister an ioctl handler.
   */
  void    
  acpi_deregister_ioctl(u_long cmd, acpi_ioctl_fn fn)
  {
      struct acpi_ioctl_hook      *hp;
  
      TAILQ_FOREACH(hp, &acpi_ioctl_hooks, link)
          if ((hp->cmd == cmd) && (hp->fn == fn))
              break;
  
      if (hp != NULL) {
          TAILQ_REMOVE(&acpi_ioctl_hooks, hp, link);
          free(hp, M_ACPIDEV);
      }
  }
  
  static int
  acpiopen(dev_t dev, int flag, int fmt, d_thread_t *td)
  {
      return (0);
  }
  
  static int
  acpiclose(dev_t dev, int flag, int fmt, d_thread_t *td)
  {
      return (0);
  }
  
  static int
  acpiioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, d_thread_t *td)
  {
      struct acpi_softc           *sc;
      struct acpi_ioctl_hook      *hp;
      int                         error, xerror, state;
      ACPI_LOCK_DECL;
  
      ACPI_LOCK;
  
      error = state = 0;
      sc = dev->si_drv1;
  
      /*
       * Scan the list of registered ioctls, looking for handlers.
       */
      if (acpi_ioctl_hooks_initted) {
          TAILQ_FOREACH(hp, &acpi_ioctl_hooks, link) {
              if (hp->cmd == cmd) {
                  xerror = hp->fn(cmd, addr, hp->arg);
                  if (xerror != 0)
                      error = xerror;
                  goto out;
              }
          }
      }
  
      /*
       * Core ioctls are not permitted for non-writable user.
       * Currently, other ioctls just fetch information.
       * Not changing system behavior.
       */
      if((flag & FWRITE) == 0)
          return (EPERM);
  
      /* Core system ioctls. */
      switch (cmd) {
      case ACPIIO_ENABLE:
          if (ACPI_FAILURE(acpi_Enable(sc)))
              error = ENXIO;
          break;
      case ACPIIO_DISABLE:
          if (ACPI_FAILURE(acpi_Disable(sc)))
              error = ENXIO;
          break;
      case ACPIIO_SETSLPSTATE:
          if (!sc->acpi_enabled) {
              error = ENXIO;
              break;
          }
          state = *(int *)addr;
          if (state >= ACPI_STATE_S0  && state <= ACPI_S_STATES_MAX) {
              if (ACPI_FAILURE(acpi_SetSleepState(sc, state)))
                  error = EINVAL;
          } else {
              error = EINVAL;
          }
          break;
      default:
          if (error == 0)
              error = EINVAL;
          break;
      }
  
  out:
      ACPI_UNLOCK;
      return (error);
  }
  
  static int
  acpi_supported_sleep_state_sysctl(SYSCTL_HANDLER_ARGS)
  {
      char sleep_state[4];
      char buf[16];
      int error;
      UINT8 state, TypeA, TypeB;
  
      buf[0] = '\0';
      for (state = ACPI_STATE_S1; state < ACPI_S_STATES_MAX+1; state++) {
          if (ACPI_SUCCESS(AcpiGetSleepTypeData(state, &TypeA, &TypeB))) {
              sprintf(sleep_state, "S%d ", state);
              strcat(buf, sleep_state);
          }
      }
      error = sysctl_handle_string(oidp, buf, sizeof(buf), req);
      return (error);
  }
  
  static int
  acpi_sleep_state_sysctl(SYSCTL_HANDLER_ARGS)
  {
      char sleep_state[10];
      int error;
      u_int new_state, old_state;
  
      old_state = *(u_int *)oidp->oid_arg1;
      if (old_state > ACPI_S_STATES_MAX+1) {
          strcpy(sleep_state, "unknown");
      } else {
          bzero(sleep_state, sizeof(sleep_state));
          strncpy(sleep_state, sleep_state_names[old_state],
                  sizeof(sleep_state_names[old_state]));
      }
      error = sysctl_handle_string(oidp, sleep_state, sizeof(sleep_state), req);
      if (error == 0 && req->newptr != NULL) {
          new_state = ACPI_STATE_S0;
          for (; new_state <= ACPI_S_STATES_MAX + 1; new_state++) {
              if (strncmp(sleep_state, sleep_state_names[new_state],
                          sizeof(sleep_state)) == 0)
                  break;
          }
          if (new_state <= ACPI_S_STATES_MAX + 1) {
              if (new_state != old_state)
                  *(u_int *)oidp->oid_arg1 = new_state;
          } else {
              error = EINVAL;
          }
      }
  
      return (error);
  }
  
  /* Inform devctl(4) when we receive a Notify. */
  void
  acpi_UserNotify(const char *subsystem, ACPI_HANDLE h, uint8_t notify)
  {
      char                notify_buf[16];
      ACPI_BUFFER         handle_buf;
      ACPI_STATUS         status;
  
      if (subsystem == NULL)
          return;
  
      handle_buf.Pointer = NULL;
      handle_buf.Length = ACPI_ALLOCATE_BUFFER;
      status = AcpiNsHandleToPathname(h, &handle_buf);
      if (ACPI_FAILURE(status))
          return;
      snprintf(notify_buf, sizeof(notify_buf), "notify=0x%02x", notify);
      devctl_notify("ACPI", subsystem, handle_buf.Pointer, notify_buf);
      AcpiOsFree(handle_buf.Pointer);
  }
  
  #ifdef ACPI_DEBUG
  /*
   * Support for parsing debug options from the kernel environment.
   *
   * Bits may be set in the AcpiDbgLayer and AcpiDbgLevel debug registers
   * by specifying the names of the bits in the debug.acpi.layer and
   * debug.acpi.level environment variables.  Bits may be unset by 
   * prefixing the bit name with !.
   */
  struct debugtag
  {
      char        *name;
      UINT32      value;
  };
  
  static struct debugtag  dbg_layer[] = {
      {"ACPI_UTILITIES",          ACPI_UTILITIES},
      {"ACPI_HARDWARE",           ACPI_HARDWARE},
      {"ACPI_EVENTS",             ACPI_EVENTS},
      {"ACPI_TABLES",             ACPI_TABLES},
      {"ACPI_NAMESPACE",          ACPI_NAMESPACE},
      {"ACPI_PARSER",             ACPI_PARSER},
      {"ACPI_DISPATCHER",         ACPI_DISPATCHER},
      {"ACPI_EXECUTER",           ACPI_EXECUTER},
      {"ACPI_RESOURCES",          ACPI_RESOURCES},
      {"ACPI_CA_DEBUGGER",        ACPI_CA_DEBUGGER},
      {"ACPI_OS_SERVICES",        ACPI_OS_SERVICES},
      {"ACPI_CA_DISASSEMBLER",    ACPI_CA_DISASSEMBLER},
      {"ACPI_ALL_COMPONENTS",     ACPI_ALL_COMPONENTS},
  
      {"ACPI_BUS",                ACPI_BUS},
      {"ACPI_SYSTEM",             ACPI_SYSTEM},
      {"ACPI_POWER",              ACPI_POWER},
      {"ACPI_EC",                 ACPI_EC},
      {"ACPI_AC_ADAPTER",         ACPI_AC_ADAPTER},
      {"ACPI_BATTERY",            ACPI_BATTERY},
      {"ACPI_BUTTON",             ACPI_BUTTON},
      {"ACPI_PROCESSOR",          ACPI_PROCESSOR},
      {"ACPI_THERMAL",            ACPI_THERMAL},
      {"ACPI_FAN",                ACPI_FAN},
      {"ACPI_ALL_DRIVERS",        ACPI_ALL_DRIVERS},
      {NULL, 0}
  };
  
  static struct debugtag dbg_level[] = {
      {"ACPI_LV_ERROR",           ACPI_LV_ERROR},
      {"ACPI_LV_WARN",            ACPI_LV_WARN},
      {"ACPI_LV_INIT",            ACPI_LV_INIT},
      {"ACPI_LV_DEBUG_OBJECT",    ACPI_LV_DEBUG_OBJECT},
      {"ACPI_LV_INFO",            ACPI_LV_INFO},
      {"ACPI_LV_ALL_EXCEPTIONS",  ACPI_LV_ALL_EXCEPTIONS},
  
      /* Trace verbosity level 1 [Standard Trace Level] */
      {"ACPI_LV_INIT_NAMES",      ACPI_LV_INIT_NAMES},
      {"ACPI_LV_PARSE",           ACPI_LV_PARSE},
      {"ACPI_LV_LOAD",            ACPI_LV_LOAD},
      {"ACPI_LV_DISPATCH",        ACPI_LV_DISPATCH},
      {"ACPI_LV_EXEC",            ACPI_LV_EXEC},
      {"ACPI_LV_NAMES",           ACPI_LV_NAMES},
      {"ACPI_LV_OPREGION",        ACPI_LV_OPREGION},
      {"ACPI_LV_BFIELD",          ACPI_LV_BFIELD},
      {"ACPI_LV_TABLES",          ACPI_LV_TABLES},
      {"ACPI_LV_VALUES",          ACPI_LV_VALUES},
      {"ACPI_LV_OBJECTS",         ACPI_LV_OBJECTS},
      {"ACPI_LV_RESOURCES",       ACPI_LV_RESOURCES},
      {"ACPI_LV_USER_REQUESTS",   ACPI_LV_USER_REQUESTS},
      {"ACPI_LV_PACKAGE",         ACPI_LV_PACKAGE},
      {"ACPI_LV_VERBOSITY1",      ACPI_LV_VERBOSITY1},
  
      /* Trace verbosity level 2 [Function tracing and memory allocation] */
      {"ACPI_LV_ALLOCATIONS",     ACPI_LV_ALLOCATIONS},
      {"ACPI_LV_FUNCTIONS",       ACPI_LV_FUNCTIONS},
      {"ACPI_LV_OPTIMIZATIONS",   ACPI_LV_OPTIMIZATIONS},
      {"ACPI_LV_VERBOSITY2",      ACPI_LV_VERBOSITY2},
      {"ACPI_LV_ALL",             ACPI_LV_ALL},
  
      /* Trace verbosity level 3 [Threading, I/O, and Interrupts] */
      {"ACPI_LV_MUTEX",           ACPI_LV_MUTEX},
      {"ACPI_LV_THREADS",         ACPI_LV_THREADS},
      {"ACPI_LV_IO",              ACPI_LV_IO},
      {"ACPI_LV_INTERRUPTS",      ACPI_LV_INTERRUPTS},
      {"ACPI_LV_VERBOSITY3",      ACPI_LV_VERBOSITY3},
  
      /* Exceptionally verbose output -- also used in the global "DebugLevel"  */
      {"ACPI_LV_AML_DISASSEMBLE", ACPI_LV_AML_DISASSEMBLE},
      {"ACPI_LV_VERBOSE_INFO",    ACPI_LV_VERBOSE_INFO},
      {"ACPI_LV_FULL_TABLES",     ACPI_LV_FULL_TABLES},
      {"ACPI_LV_EVENTS",          ACPI_LV_EVENTS},
      {"ACPI_LV_VERBOSE",         ACPI_LV_VERBOSE},
      {NULL, 0}
  };    
  
  static void
  acpi_parse_debug(char *cp, struct debugtag *tag, UINT32 *flag)
  {
      char        *ep;
      int         i, l;
      int         set;
  
      while (*cp) {
          if (isspace(*cp)) {
              cp++;
              continue;
          }
          ep = cp;
          while (*ep && !isspace(*ep))
              ep++;
          if (*cp == '!') {
              set = 0;
              cp++;
              if (cp == ep)
                  continue;
          } else {
              set = 1;
          }
          l = ep - cp;
          for (i = 0; tag[i].name != NULL; i++) {
              if (!strncmp(cp, tag[i].name, l)) {
                  if (set)
                      *flag |= tag[i].value;
                  else
                      *flag &= ~tag[i].value;
                  printf("ACPI_DEBUG: set '%s'\n", tag[i].name);
              }
          }
          cp = ep;
      }
  }
  
  static void
  acpi_set_debugging(void *junk)
  {
      char        *cp;
  
      if (cold) {
          AcpiDbgLayer = 0;
          AcpiDbgLevel = 0;
      }
  
      if ((cp = getenv("debug.acpi.layer")) != NULL) {
          acpi_parse_debug(cp, &dbg_layer[0], &AcpiDbgLayer);
          freeenv(cp);
      }
      if ((cp = getenv("debug.acpi.level")) != NULL) {
          acpi_parse_debug(cp, &dbg_level[0], &AcpiDbgLevel);
          freeenv(cp);
      }
  
      if (cold) {
          printf("ACPI debug layer 0x%x debug level 0x%x\n",
                 AcpiDbgLayer, AcpiDbgLevel);
      }
  }
  SYSINIT(acpi_debugging, SI_SUB_TUNABLES, SI_ORDER_ANY, acpi_set_debugging,
          NULL);
  
  static int
  acpi_debug_sysctl(SYSCTL_HANDLER_ARGS)
  {
      char        *options;
      int          error, len, *dbg;
      struct       debugtag *tag;
  
      len = 512;
      MALLOC(options, char *, len, M_TEMP, M_WAITOK);
      options[0] = '\0';
  
      if (strcmp(oidp->oid_arg1, "debug.acpi.layer") == 0) {
          tag = &dbg_layer[0];
          dbg = &AcpiDbgLayer;
      } else {
          tag = &dbg_level[0];
          dbg = &AcpiDbgLevel;
      }
  
      /* Get old values if this is a get request. */
      if (*dbg == 0) {
          strlcpy(options, "NONE", sizeof(options));
      } else if (req->newptr == NULL) {
          for (; tag->name != NULL; tag++) {
              if ((*dbg & tag->value) == tag->value) {
                  strlcat(options, tag->name, len);
                  strlcat(options, " ", len); /* XXX */
              }
          }
      }
  
      error = sysctl_handle_string(oidp, options, len, req);
  
      /* If the user is setting a string, parse it. */
      if (error == 0 && req->newptr != NULL) {
          *dbg = 0;
          setenv((char *)oidp->oid_arg1, (char *)req->newptr);
          acpi_set_debugging(NULL);
      }
      FREE(options, M_TEMP);
  
      return (error);
  }
  SYSCTL_PROC(_debug_acpi, OID_AUTO, layer, CTLFLAG_RW | CTLTYPE_STRING,
              "debug.acpi.layer", 0, acpi_debug_sysctl, "A", "");
  SYSCTL_PROC(_debug_acpi, OID_AUTO, level, CTLFLAG_RW | CTLTYPE_STRING,
              "debug.acpi.level", 0, acpi_debug_sysctl, "A", "");
  #endif
  
  static int
  acpi_pm_func(u_long cmd, void *arg, ...)
  {
          int     state, acpi_state;
          int     error;
          struct  acpi_softc *sc;
          va_list ap;
  
          error = 0;
          switch (cmd) {
          case POWER_CMD_SUSPEND:
                  sc = (struct acpi_softc *)arg;
                  if (sc == NULL) {
                          error = EINVAL;
                          goto out;
                  }
  
                  va_start(ap, arg);
                  state = va_arg(ap, int);
                  va_end(ap);     
  
                  switch (state) {
                  case POWER_SLEEP_STATE_STANDBY:
                          acpi_state = sc->acpi_standby_sx;
                          break;
                  case POWER_SLEEP_STATE_SUSPEND:
                          acpi_state = sc->acpi_suspend_sx;
                          break;
                  case POWER_SLEEP_STATE_HIBERNATE:
                          acpi_state = ACPI_STATE_S4;
                          break;
                  default:
                          error = EINVAL;
                          goto out;
                  }
  
                  acpi_SetSleepState(sc, acpi_state);
                  break;
          default:
                  error = EINVAL;
                  goto out;
          }
  
  out:
          return (error);
  }
  
  static void
  acpi_pm_register(void *arg)
  {
      if (!cold || resource_disabled("acpi", 0))
          return;
  
      power_pm_register(POWER_PM_TYPE_ACPI, acpi_pm_func, NULL);
  }
  
  SYSINIT(power, SI_SUB_KLD, SI_ORDER_ANY, acpi_pm_register, 0);

Cache object: 20a9e6786591780b562a8fc17e1f967d