io/acpica/acpica.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
 * Copyright 2016, Joyent, Inc.
 */
/*
 * Copyright (c) 2009, Intel Corporation.
 * All rights reserved.
 */
/*
 * Solaris x86 ACPI CA services
 */

#include <sys/file.h>
#include <sys/errno.h>
#include <sys/conf.h>
#include <sys/modctl.h>
#include <sys/open.h>
#include <sys/stat.h>
#include <sys/spl.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/esunddi.h>
#include <sys/kstat.h>
#include <sys/x86_archext.h>

#include <sys/acpi/acpi.h>
#include <sys/acpica.h>
#include <sys/archsystm.h>

/*
 *
 */
static  struct modlmisc modlmisc = {
    &mod_miscops,
    "ACPI interpreter",
};

static  struct modlinkage modlinkage = {
    MODREV_1,       /* MODREV_1 manual */
    (void *)&modlmisc,  /* module linkage */
    NULL,           /* list terminator */
};

/*
 * Local prototypes
 */

struct parsed_prw {
    ACPI_HANDLE prw_gpeobj;
    int     prw_gpebit;
    int     prw_level;
};

static void acpica_init_kstats(void);
static ACPI_STATUS  acpica_init_PRW(
    ACPI_HANDLE hdl,
    UINT32      lvl,
    void        *ctxp,
    void        **rvpp);

static ACPI_STATUS  acpica_parse_PRW(
    ACPI_BUFFER *prw_buf,
    struct parsed_prw *prw);

/*
 * Local data
 */

static kmutex_t acpica_module_lock;
static kstat_t  *acpica_ksp;

/*
 * State of acpica subsystem
 * After successful initialization, will be ACPICA_INITIALIZED
 */
int acpica_init_state = ACPICA_NOT_INITIALIZED;

void *AcpiGbl_DbBuffer;
uint32_t AcpiGbl_DbConsoleDebugLevel;

/*
 * Following are set by acpica_process_user_options()
 *
 * acpica_enable = FALSE prevents initialization of ACPI CA
 * completely
 *
 * acpi_init_level determines level of ACPI CA functionality
 * enabled in acpica_init()
 */
int acpica_enable;
UINT32  acpi_init_level;

/*
 * Non-zero enables lax behavior with respect to some
 * common ACPI BIOS issues; see ACPI CA documentation
 * Setting this to zero causes ACPI CA to enforce strict
 * compliance with ACPI specification
 */
int acpica_enable_interpreter_slack = 1;

/*
 * For non-DEBUG builds, set the ACPI CA debug level to 0
 * to quiet chatty BIOS output into /var/adm/messages
 * Field-patchable for diagnostic use.
 */
#ifdef  DEBUG
int acpica_muzzle_debug_output = 0;
#else
int acpica_muzzle_debug_output = 1;
#endif

/*
 * ACPI DDI hooks
 */
static int acpica_ddi_setwake(dev_info_t *dip, int level);

int
_init(void)
{
    int error = EBUSY;
    int status;
    extern int (*acpi_fp_setwake)();
    extern kmutex_t cpu_map_lock;

    mutex_init(&acpica_module_lock, NULL, MUTEX_DRIVER, NULL);
    mutex_init(&cpu_map_lock, NULL, MUTEX_SPIN,
        (ddi_iblock_cookie_t)ipltospl(DISP_LEVEL));

    if ((error = mod_install(&modlinkage)) != 0) {
        mutex_destroy(&acpica_module_lock);
        goto load_error;
    }

    AcpiGbl_EnableInterpreterSlack = (acpica_enable_interpreter_slack != 0);

    /* global ACPI CA initialization */
    if (ACPI_FAILURE(status = AcpiInitializeSubsystem()))
        cmn_err(CE_WARN, "!AcpiInitializeSubsystem failed: %d", status);

    /* initialize table manager */
    if (ACPI_FAILURE(status = AcpiInitializeTables(NULL, 0, 0)))
        cmn_err(CE_WARN, "!AcpiInitializeTables failed: %d", status);

    acpi_fp_setwake = acpica_ddi_setwake;

load_error:
    return (error);
}

int
_info(struct modinfo *modinfop)
{
    return (mod_info(&modlinkage, modinfop));
}

int
_fini(void)
{
    /*
     * acpica module is never unloaded at run-time; there's always
     * a PSM depending on it, at the very least
     */
    return (EBUSY);
}

/*
 * Install acpica-provided (default) address-space handlers
 * that may be needed before AcpiEnableSubsystem() runs.
 * See the comment in AcpiInstallAddressSpaceHandler().
 * Default handlers for remaining address spaces are
 * installed later, in AcpiEnableSubsystem.
 */
static int
acpica_install_handlers()
{
    ACPI_STATUS rv = AE_OK;
    ACPI_STATUS res;

    /*
     * Install ACPI CA default handlers
     */
    if ((res = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
        ACPI_ADR_SPACE_SYSTEM_MEMORY,
        ACPI_DEFAULT_HANDLER, NULL, NULL)) != AE_OK &&
        res != AE_SAME_HANDLER) {
        cmn_err(CE_WARN, "!acpica: no default handler for"
            " system memory");
        rv = AE_ERROR;
    }

    if ((res = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
        ACPI_ADR_SPACE_SYSTEM_IO,
        ACPI_DEFAULT_HANDLER, NULL, NULL)) != AE_OK &&
        res != AE_SAME_HANDLER) {
        cmn_err(CE_WARN, "!acpica: no default handler for"
            " system I/O");
        rv = AE_ERROR;
    }

    if ((res = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
        ACPI_ADR_SPACE_PCI_CONFIG,
        ACPI_DEFAULT_HANDLER, NULL, NULL)) != AE_OK &&
        res != AE_SAME_HANDLER) {
        cmn_err(CE_WARN, "!acpica: no default handler for"
            " PCI Config");
        rv = AE_ERROR;
    }

    if ((res = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
        ACPI_ADR_SPACE_DATA_TABLE,
        ACPI_DEFAULT_HANDLER, NULL, NULL)) != AE_OK &&
        res != AE_SAME_HANDLER) {
        cmn_err(CE_WARN, "!acpica: no default handler for"
            " Data Table");
        rv = AE_ERROR;
    }

    return (rv);
}

/*
 * Find the BIOS date, and return TRUE if supplied
 * date is same or later than the BIOS date, or FALSE
 * if the BIOS date can't be fetched for any reason
 */
static int
acpica_check_bios_date(int yy, int mm, int dd)
{

    char *datep;
    int bios_year, bios_month, bios_day;

    /* If firmware has no bios, skip the check */
    if (ddi_prop_exists(DDI_DEV_T_ANY, ddi_root_node(), DDI_PROP_DONTPASS,
        "bios-free"))
        return (TRUE);

    /*
     * PC BIOSes contain a string in the form of
     * "mm/dd/yy" at absolute address 0xffff5,
     * where mm, dd and yy are all ASCII digits.
     * We map the string, pluck out the values,
     * and accept all BIOSes from 1 Jan 1999 on
     * as valid.
     */

    if ((datep = (char *)AcpiOsMapMemory(0xffff5, 8)) == NULL)
        return (FALSE);

    /* year */
    bios_year = ((int)(*(datep + 6) - '0') * 10) + (*(datep + 7) - '0');
    /* month */
    bios_month = ((int)(*datep - '0') * 10) + (*(datep + 1) - '0');
    /* day */
    bios_day = ((int)(*(datep + 3) - '0') * 10) + (*(datep + 4) - '0');

    AcpiOsUnmapMemory((void *) datep, 8);

    if (bios_year < 0 || bios_year > 99 || bios_month < 0 ||
        bios_month > 99 || bios_day < 0 || bios_day > 99) {
        /* non-digit chars in BIOS date */
        return (FALSE);
    }

    /*
     * Adjust for 2-digit year; note to grand-children:
     * need a new scheme before 2080 rolls around
     */
    bios_year += (bios_year >= 80 && bios_year <= 99) ?
        1900 : 2000;

    if (bios_year < yy)
        return (FALSE);
    else if (bios_year > yy)
        return (TRUE);

    if (bios_month < mm)
        return (FALSE);
    else if (bios_month > mm)
        return (TRUE);

    if (bios_day < dd)
        return (FALSE);

    return (TRUE);
}

/*
 * Check for Metropolis systems with BIOSes older than 10/12/04
 * return TRUE if BIOS requires legacy mode, FALSE otherwise
 */
static int
acpica_metro_old_bios()
{
    ACPI_TABLE_HEADER *fadt;

    /* get the FADT */
    if (AcpiGetTable(ACPI_SIG_FADT, 1, (ACPI_TABLE_HEADER **)&fadt) !=
        AE_OK)
        return (FALSE);

    /* compare OEM Table ID to "SUNmetro" - no match, return false */
    if (strncmp("SUNmetro", fadt->OemTableId, 8))
        return (FALSE);

    /* On a Metro - return FALSE if later than 10/12/04 */
    return (!acpica_check_bios_date(2004, 10, 12));
}


/*
 * Process acpi-user-options property  if present
 */
static void
acpica_process_user_options()
{
    static int processed = 0;
    int acpi_user_options;
    char *acpi_prop;

    /*
     * return if acpi-user-options has already been processed
     */
    if (processed)
        return;
    else
        processed = 1;

    /* converts acpi-user-options from type string to int, if any */
    if (ddi_prop_lookup_string(DDI_DEV_T_ANY, ddi_root_node(),
        DDI_PROP_DONTPASS, "acpi-user-options", &acpi_prop) ==
        DDI_PROP_SUCCESS) {
        long data;
        int ret;
        ret = ddi_strtol(acpi_prop, NULL, 0, &data);
        if (ret == 0) {
            e_ddi_prop_remove(DDI_DEV_T_NONE, ddi_root_node(),
                "acpi-user-options");
            e_ddi_prop_update_int(DDI_DEV_T_NONE, ddi_root_node(),
                "acpi-user-options", data);
        }
        ddi_prop_free(acpi_prop);
    }

    /*
     * fetch the optional options property
     */
    acpi_user_options = ddi_prop_get_int(DDI_DEV_T_ANY, ddi_root_node(),
        DDI_PROP_DONTPASS, "acpi-user-options", 0);

    /*
     * Note that 'off' has precedence over 'on'
     * Also note - all cases of ACPI_OUSER_MASK
     * provided here, no default: case is present
     */
    switch (acpi_user_options & ACPI_OUSER_MASK) {
    case ACPI_OUSER_DFLT:
        acpica_enable = acpica_check_bios_date(1999, 1, 1);
        break;
    case ACPI_OUSER_ON:
        acpica_enable = TRUE;
        break;
    case ACPI_OUSER_OFF:
    case ACPI_OUSER_OFF | ACPI_OUSER_ON:
        acpica_enable = FALSE;
        break;
    }

    acpi_init_level = ACPI_FULL_INITIALIZATION;

    /*
     * special test here; may be generalized in the
     * future - test for a machines that are known to
     * work only in legacy mode, and set OUSER_LEGACY if
     * we're on one
     */
    if (acpica_metro_old_bios())
        acpi_user_options |= ACPI_OUSER_LEGACY;

    /*
     * If legacy mode is specified, set initialization
     * options to avoid entering ACPI mode and hooking SCI
     * - basically try to act like legacy acpi_intp
     */
    if ((acpi_user_options & ACPI_OUSER_LEGACY) != 0)
        acpi_init_level |= (ACPI_NO_ACPI_ENABLE | ACPI_NO_HANDLER_INIT);

    /*
     * modify default ACPI CA debug output level for non-DEBUG builds
     * (to avoid BIOS debug chatter in /var/adm/messages)
     */
    if (acpica_muzzle_debug_output)
        AcpiDbgLevel = 0;
}

/*
 * Initialize the CA subsystem if it hasn't been done already
 */
int
acpica_init()
{
    extern void acpica_find_ioapics(void);
    ACPI_STATUS status;

    /*
     * Make sure user options are processed,
     * then fail to initialize if ACPI CA has been
     * disabled
     */
    acpica_process_user_options();
    if (!acpica_enable)
        return (AE_ERROR);

    mutex_enter(&acpica_module_lock);
    if (acpica_init_state == ACPICA_INITIALIZED) {
        mutex_exit(&acpica_module_lock);
        return (AE_OK);
    }

    if (ACPI_FAILURE(status = AcpiLoadTables()))
        goto error;

    if (ACPI_FAILURE(status = acpica_install_handlers()))
        goto error;

    /*
     * Create ACPI-to-devinfo mapping now so _INI and _STA
     * methods can access PCI config space when needed
     */
    scan_d2a_map();

    if (ACPI_FAILURE(status = AcpiEnableSubsystem(acpi_init_level)))
        goto error;

    /* do after AcpiEnableSubsystem() so GPEs are initialized */
    acpica_ec_init();   /* initialize EC if present */

    /* This runs all device _STA and _INI methods. */
    if (ACPI_FAILURE(status = AcpiInitializeObjects(0)))
        goto error;

    acpica_init_state = ACPICA_INITIALIZED;

    /*
     * [ACPI, sec. 4.4.1.1]
     * As of ACPICA version 20101217 (December 2010), the _PRW methods
     * (Power Resources for Wake) are no longer automatically executed
     * as part of the ACPICA initialization.  The OS must do this.
     */
    (void) AcpiWalkNamespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
        UINT32_MAX, acpica_init_PRW, NULL, NULL, NULL);
    (void) AcpiUpdateAllGpes();

    /*
     * If we are running on the Xen hypervisor as dom0 we need to
     * find the ioapics so we can prevent ACPI from trying to
     * access them.
     */
    if (get_hwenv() == HW_XEN_PV && is_controldom())
        acpica_find_ioapics();
    acpica_init_kstats();
error:
    if (acpica_init_state != ACPICA_INITIALIZED) {
        cmn_err(CE_NOTE, "!failed to initialize ACPI services");
    }

    /*
     * Set acpi-status to 13 if acpica has been initialized successfully.
     * This indicates that acpica is up and running.  This variable name
     * and value were chosen in order to remain compatible with acpi_intp.
     */
    e_ddi_prop_update_int(DDI_DEV_T_NONE, ddi_root_node(), "acpi-status",
        (ACPI_SUCCESS(status)) ? (ACPI_BOOT_INIT | ACPI_BOOT_ENABLE |
        ACPI_BOOT_BOOTCONF) : 0);

    /* Mark acpica subsystem as fully initialized. */
    if (ACPI_SUCCESS(status) &&
        acpi_init_level == ACPI_FULL_INITIALIZATION) {
        acpica_set_core_feature(ACPI_FEATURE_FULL_INIT);
    }

    mutex_exit(&acpica_module_lock);
    return (status);
}

/*
 * SCI handling
 */

ACPI_STATUS
acpica_get_sci(int *sci_irq, iflag_t *sci_flags)
{
    ACPI_SUBTABLE_HEADER        *ap;
    ACPI_TABLE_MADT         *mat;
    ACPI_MADT_INTERRUPT_OVERRIDE    *mio;
    ACPI_TABLE_FADT         *fadt;
    int         madt_seen, madt_size;


    /*
     * Make sure user options are processed,
     * then return error if ACPI CA has been
     * disabled or system is not running in ACPI
     * and won't need/understand SCI
     */
    acpica_process_user_options();
    if ((!acpica_enable) || (acpi_init_level & ACPI_NO_ACPI_ENABLE))
        return (AE_ERROR);

    /*
     * according to Intel ACPI developers, SCI
     * conforms to PCI bus conventions; level/low
     * unless otherwise directed by overrides.
     */
    sci_flags->intr_el = INTR_EL_LEVEL;
    sci_flags->intr_po = INTR_PO_ACTIVE_LOW;
    sci_flags->bustype = BUS_PCI;   /*  we *do* conform to PCI */

    /* get the SCI from the FADT */
    if (AcpiGetTable(ACPI_SIG_FADT, 1, (ACPI_TABLE_HEADER **)&fadt) !=
        AE_OK)
        return (AE_ERROR);

    *sci_irq = fadt->SciInterrupt;

    /* search for ISOs that modify it */
    /* if we don't find a MADT, that's OK; no ISOs then */
    if (AcpiGetTable(ACPI_SIG_MADT, 1, (ACPI_TABLE_HEADER **) &mat) !=
        AE_OK)
        return (AE_OK);

    ap = (ACPI_SUBTABLE_HEADER *) (mat + 1);
    madt_size = mat->Header.Length;
    madt_seen = sizeof (*mat);

    while (madt_seen < madt_size) {
        switch (ap->Type) {
        case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
            mio = (ACPI_MADT_INTERRUPT_OVERRIDE *) ap;
            if (mio->SourceIrq == *sci_irq) {
                *sci_irq = mio->GlobalIrq;
                sci_flags->intr_el = (mio->IntiFlags &
                    ACPI_MADT_TRIGGER_MASK) >> 2;
                sci_flags->intr_po = mio->IntiFlags &
                    ACPI_MADT_POLARITY_MASK;
            }
            break;
        }

        /* advance to next entry */
        madt_seen += ap->Length;
        ap = (ACPI_SUBTABLE_HEADER *)(((char *)ap) + ap->Length);
    }

    /*
     * One more check; if ISO said "conform", revert to default
     */
    if (sci_flags->intr_el == INTR_EL_CONFORM)
        sci_flags->intr_el = INTR_EL_LEVEL;
    if (sci_flags->intr_po == INTR_PO_CONFORM)
        sci_flags->intr_po = INTR_PO_ACTIVE_LOW;

    return (AE_OK);
}

/*
 * Call-back function used for _PRW initialization.  For every
 * device node that has a _PRW method, evaluate, parse, and do
 * AcpiSetupGpeForWake().
 */
static ACPI_STATUS
acpica_init_PRW(
    ACPI_HANDLE devhdl,
    UINT32      depth,
    void        *ctxp,
    void        **rvpp)
{
    ACPI_STATUS status;
    ACPI_BUFFER prw_buf;
    struct parsed_prw prw;

    prw_buf.Pointer = NULL;
    prw_buf.Length = ACPI_ALLOCATE_BUFFER;

    /*
     * Attempt to evaluate _PRW object.
     * If no valid object is found, return quietly, since not all
     * devices have _PRW objects.
     */
    status = AcpiEvaluateObject(devhdl, "_PRW", NULL, &prw_buf);
    if (ACPI_FAILURE(status))
        goto done;
    status = acpica_parse_PRW(&prw_buf, &prw);
    if (ACPI_FAILURE(status))
        goto done;

    (void) AcpiSetupGpeForWake(devhdl,
        prw.prw_gpeobj, prw.prw_gpebit);

done:
    if (prw_buf.Pointer != NULL)
        AcpiOsFree(prw_buf.Pointer);

    return (AE_OK);
}

/*
 * Sets ACPI wake state for device referenced by dip.
 * If level is S0 (0), disables wake event; otherwise,
 * enables wake event which will wake system from level.
 */
static int
acpica_ddi_setwake(dev_info_t *dip, int level)
{
    ACPI_STATUS status;
    ACPI_HANDLE devobj;
    ACPI_BUFFER prw_buf;
    ACPI_OBJECT_LIST    arglist;
    ACPI_OBJECT     args[3];
    struct parsed_prw prw;
    int     rv;

    /*
     * initialize these early so we can use a common
     * exit point below
     */
    prw_buf.Pointer = NULL;
    prw_buf.Length = ACPI_ALLOCATE_BUFFER;
    rv = 0;

    /*
     * Attempt to get a handle to a corresponding ACPI object.
     * If no object is found, return quietly, since not all
     * devices have corresponding ACPI objects.
     */
    status = acpica_get_handle(dip, &devobj);
    if (ACPI_FAILURE(status)) {
        char pathbuf[MAXPATHLEN];
        ddi_pathname(dip, pathbuf);
#ifdef DEBUG
        cmn_err(CE_NOTE, "!acpica_ddi_setwake: could not get"
            " handle for %s, %s:%d", pathbuf, ddi_driver_name(dip),
            ddi_get_instance(dip));
#endif
        goto done;
    }

    /*
     * ACPI3.0 7.2.1: only use the _PSW method if OSPM does not support
     * _DSW or if the _DSW method is not present.
     *
     * _DSW arguments:
     * args[0] - Enable/Disable
     * args[1] - Target system state
     * args[2] - Target device state
     */

    arglist.Count = 3;
    arglist.Pointer = args;
    args[0].Type = ACPI_TYPE_INTEGER;
    args[0].Integer.Value = level ? 1 : 0;
    args[1].Type = ACPI_TYPE_INTEGER;
    args[1].Integer.Value = level;
    args[2].Type = ACPI_TYPE_INTEGER;
    args[2].Integer.Value = level;
    if (ACPI_FAILURE(status = AcpiEvaluateObject(devobj, "_DSW",
        &arglist, NULL))) {

        if (status == AE_NOT_FOUND) {
            arglist.Count = 1;
            args[0].Type = ACPI_TYPE_INTEGER;
            args[0].Integer.Value = level ? 1 : 0;

            if (ACPI_FAILURE(status = AcpiEvaluateObject(devobj,
                "_PSW", &arglist, NULL))) {

                if (status != AE_NOT_FOUND) {
                    cmn_err(CE_NOTE,
                        "!_PSW failure %d for device %s",
                        status, ddi_driver_name(dip));
                }
            }

        } else {
            cmn_err(CE_NOTE, "!_DSW failure %d for device %s",
                status, ddi_driver_name(dip));
        }
    }

    /*
     * Attempt to evaluate _PRW object.
     * If no valid object is found, return quietly, since not all
     * devices have _PRW objects.
     */
    status = AcpiEvaluateObject(devobj, "_PRW", NULL, &prw_buf);
    if (ACPI_FAILURE(status))
        goto done;
    status = acpica_parse_PRW(&prw_buf, &prw);
    if (ACPI_FAILURE(status))
        goto done;

    rv = -1;
    if (level == 0) {
        status = AcpiDisableGpe(prw.prw_gpeobj, prw.prw_gpebit);
        if (ACPI_FAILURE(status))
            goto done;
    } else if (prw.prw_level >= level) {
        status = AcpiSetGpeWakeMask(prw.prw_gpeobj, prw.prw_gpebit,
            ACPI_GPE_ENABLE);
        if (ACPI_SUCCESS(status)) {
            status = AcpiEnableGpe(prw.prw_gpeobj, prw.prw_gpebit);
            if (ACPI_FAILURE(status))
                goto done;
        }
    }
    rv = 0;
done:
    if (prw_buf.Pointer != NULL)
        AcpiOsFree(prw_buf.Pointer);
    return (rv);
}

static ACPI_STATUS
acpica_parse_PRW(
    ACPI_BUFFER *prw_buf,
    struct parsed_prw *p_prw)
{
    ACPI_HANDLE gpeobj;
    ACPI_OBJECT *prw, *gpe;
    int     gpebit, prw_level;

    if (prw_buf->Length == 0 || prw_buf->Pointer == NULL)
        return (AE_NULL_OBJECT);

    prw = prw_buf->Pointer;
    if (prw->Type != ACPI_TYPE_PACKAGE || prw->Package.Count < 2 ||
        prw->Package.Elements[1].Type != ACPI_TYPE_INTEGER)
        return (AE_TYPE);

    /* fetch the lowest wake level from the _PRW */
    prw_level = prw->Package.Elements[1].Integer.Value;

    /*
     * process the GPE description
     */
    switch (prw->Package.Elements[0].Type) {
    case ACPI_TYPE_INTEGER:
        gpeobj = NULL;
        gpebit = prw->Package.Elements[0].Integer.Value;
        break;
    case ACPI_TYPE_PACKAGE:
        gpe = &prw->Package.Elements[0];
        if (gpe->Package.Count != 2 ||
            gpe->Package.Elements[1].Type != ACPI_TYPE_INTEGER)
            return (AE_TYPE);
        gpeobj = gpe->Package.Elements[0].Reference.Handle;
        gpebit = gpe->Package.Elements[1].Integer.Value;
        if (gpeobj == NULL)
            return (AE_NULL_OBJECT);
        break;
    default:
        return (AE_TYPE);
    }

    p_prw->prw_gpeobj = gpeobj;
    p_prw->prw_gpebit = gpebit;
    p_prw->prw_level  = prw_level;

    return (AE_OK);
}

/*
 * kstat access to a limited set of ACPI propertis
 */
static void
acpica_init_kstats()
{
    ACPI_HANDLE s3handle;
    ACPI_STATUS status;
    ACPI_TABLE_FADT *fadt;
    kstat_named_t *knp;

    /*
     * Create a small set of named kstats; just return in the rare
     * case of a failure, * in which case, the kstats won't be present.
     */
    if ((acpica_ksp = kstat_create("acpi", 0, "acpi", "misc",
        KSTAT_TYPE_NAMED, 2, 0)) == NULL)
        return;

    /*
     * initialize kstat 'S3' to reflect the presence of \_S3 in
     * the ACPI namespace (1 = present, 0 = not present)
     */
    knp = acpica_ksp->ks_data;
    knp->value.l = (AcpiGetHandle(NULL, "\\_S3", &s3handle) == AE_OK);
    kstat_named_init(knp, "S3", KSTAT_DATA_LONG);
    knp++;      /* advance to next named kstat */

    /*
     * initialize kstat 'preferred_pm_profile' to the value
     * contained in the (always present) FADT
     */
    status = AcpiGetTable(ACPI_SIG_FADT, 1, (ACPI_TABLE_HEADER **)&fadt);
    knp->value.l = (status == AE_OK) ? fadt->PreferredProfile : -1;
    kstat_named_init(knp, "preferred_pm_profile", KSTAT_DATA_LONG);

    /*
     * install the named kstats
     */
    kstat_install(acpica_ksp);
}

/*
 * Attempt to save the current ACPI settings (_CRS) for the device
 * which corresponds to the supplied devinfo node.  The settings are
 * saved as a property on the dip.  If no ACPI object is found to be
 * associated with the devinfo node, no action is taken and no error
 * is reported.
 */
void
acpica_ddi_save_resources(dev_info_t *dip)
{
    ACPI_HANDLE devobj;
    ACPI_BUFFER resbuf;
    int     ret;

    resbuf.Length = ACPI_ALLOCATE_BUFFER;
    if (ACPI_FAILURE(acpica_get_handle(dip, &devobj)) ||
        ACPI_FAILURE(AcpiGetCurrentResources(devobj, &resbuf)))
        return;

    ret = ddi_prop_create(DDI_DEV_T_NONE, dip, DDI_PROP_CANSLEEP,
        "acpi-crs", resbuf.Pointer, resbuf.Length);

    ASSERT(ret == DDI_PROP_SUCCESS);

    AcpiOsFree(resbuf.Pointer);
}

/*
 * If the supplied devinfo node has an ACPI settings property attached,
 * restore them to the associated ACPI device using _SRS.  The property
 * is deleted from the devinfo node afterward.
 */
void
acpica_ddi_restore_resources(dev_info_t *dip)
{
    ACPI_HANDLE devobj;
    ACPI_BUFFER resbuf;
    uchar_t     *propdata;
    uint_t      proplen;

    if (ACPI_FAILURE(acpica_get_handle(dip, &devobj)))
        return;

    if (ddi_prop_lookup_byte_array(DDI_DEV_T_ANY, dip, DDI_PROP_DONTPASS,
        "acpi-crs", &propdata, &proplen) != DDI_PROP_SUCCESS)
        return;

    resbuf.Pointer = propdata;
    resbuf.Length = proplen;
    (void) AcpiSetCurrentResources(devobj, &resbuf);
    ddi_prop_free(propdata);
    (void) ddi_prop_remove(DDI_DEV_T_NONE, dip, "acpi-crs");
}

void
acpi_reset_system(void)
{
    ACPI_STATUS status;
    int ten;

    status = AcpiReset();
    if (status == AE_OK) {
        /*
         * Wait up to 500 milliseconds for AcpiReset() to make its
         * way.
         */
        ten = 50000;
        while (ten-- > 0)
            tenmicrosec();
    }
}