FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpivar.h

     /*-
      * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@jp.freebsd.org>
      * Copyright (c) 2000 Michael Smith <msmith@freebsd.org>
      * 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.
     *
     * $FreeBSD$
     */
    
    #ifndef _ACPIVAR_H_
    #define _ACPIVAR_H_
    
    #ifdef _KERNEL
    
    #include "acpi_if.h"
    #include "bus_if.h"
    #include <sys/_eventhandler.h>
    #ifdef INTRNG
    #include <sys/intr.h>
    #endif
    #include <sys/ktr.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <sys/selinfo.h>
    #include <sys/sx.h>
    #include <sys/sysctl.h>
    
    #include <machine/bus.h>
    #include <machine/resource.h>
    
    struct apm_clone_data;
    struct acpi_softc {
        device_t            acpi_dev;
        struct cdev         *acpi_dev_t;
    
        int                 acpi_enabled;
        int                 acpi_sstate;
        int                 acpi_sleep_disabled;
        int                 acpi_resources_reserved;
    
        struct sysctl_ctx_list acpi_sysctl_ctx;
        struct sysctl_oid   *acpi_sysctl_tree;
        int                 acpi_power_button_sx;
        int                 acpi_sleep_button_sx;
        int                 acpi_lid_switch_sx;
    
        int                 acpi_standby_sx;
        int                 acpi_suspend_sx;
    
        int                 acpi_sleep_delay;
        int                 acpi_s4bios;
        int                 acpi_do_disable;
        int                 acpi_verbose;
        int                 acpi_handle_reboot;
    
        vm_offset_t         acpi_wakeaddr;
        vm_paddr_t          acpi_wakephys;
    
        int                 acpi_next_sstate;       /* Next suspend Sx state. */
        struct apm_clone_data *acpi_clone;          /* Pseudo-dev for devd(8). */
        STAILQ_HEAD(,apm_clone_data) apm_cdevs;     /* All apm/apmctl/acpi cdevs. */
        struct callout      susp_force_to;          /* Force suspend if no acks. */
    };
    
    struct acpi_device {
        /* ACPI ivars */
        ACPI_HANDLE                 ad_handle;
        void                        *ad_private;
        int                         ad_flags;
        int                         ad_cls_class;
    
        ACPI_BUFFER                 dsd;    /* Device Specific Data */
        const ACPI_OBJECT   *dsd_pkg;
    
        /* Resources */
        struct resource_list        ad_rl;
    };
    
   #ifdef INTRNG
   struct intr_map_data_acpi {
           struct intr_map_data    hdr;
           u_int                   irq;
           u_int                   pol;
           u_int                   trig;
   };
   
   #endif
   
   /* Track device (/dev/{apm,apmctl} and /dev/acpi) notification status. */
   struct apm_clone_data {
       STAILQ_ENTRY(apm_clone_data) entries;
       struct cdev         *cdev;
       int                 flags;
   #define ACPI_EVF_NONE   0       /* /dev/apm semantics */
   #define ACPI_EVF_DEVD   1       /* /dev/acpi is handled via devd(8) */
   #define ACPI_EVF_WRITE  2       /* Device instance is opened writable. */
       int                 notify_status;
   #define APM_EV_NONE     0       /* Device not yet aware of pending sleep. */
   #define APM_EV_NOTIFIED 1       /* Device saw next sleep state. */
   #define APM_EV_ACKED    2       /* Device agreed sleep can occur. */
       struct acpi_softc   *acpi_sc;
       struct selinfo      sel_read;
   };
   
   #define ACPI_PRW_MAX_POWERRES   8
   
   struct acpi_prw_data {
       ACPI_HANDLE         gpe_handle;
       int                 gpe_bit;
       int                 lowest_wake;
       ACPI_OBJECT         power_res[ACPI_PRW_MAX_POWERRES];
       int                 power_res_count;
   };
   
   /* Flags for each device defined in the AML namespace. */
   #define ACPI_FLAG_WAKE_ENABLED  0x1
   
   /* Macros for extracting parts of a PCI address from an _ADR value. */
   #define ACPI_ADR_PCI_SLOT(adr)  (((adr) & 0xffff0000) >> 16)
   #define ACPI_ADR_PCI_FUNC(adr)  ((adr) & 0xffff)
   
   /*
    * Entry points to ACPI from above are global functions defined in this
    * file, sysctls, and I/O on the control device.  Entry points from below
    * are interrupts (the SCI), notifies, task queue threads, and the thermal
    * zone polling thread.
    *
    * ACPI tables and global shared data are protected by a global lock
    * (acpi_mutex).  
    *
    * Each ACPI device can have its own driver-specific mutex for protecting
    * shared access to local data.  The ACPI_LOCK macros handle mutexes.
    *
    * Drivers that need to serialize access to functions (e.g., to route
    * interrupts, get/set control paths, etc.) should use the sx lock macros
    * (ACPI_SERIAL).
    *
    * ACPI-CA handles its own locking and should not be called with locks held.
    *
    * The most complicated path is:
    *     GPE -> EC runs _Qxx -> _Qxx reads EC space -> GPE
    */
   extern struct mtx                       acpi_mutex;
   #define ACPI_LOCK(sys)                  mtx_lock(&sys##_mutex)
   #define ACPI_UNLOCK(sys)                mtx_unlock(&sys##_mutex)
   #define ACPI_LOCK_ASSERT(sys)           mtx_assert(&sys##_mutex, MA_OWNED);
   #define ACPI_LOCK_DECL(sys, name)                               \
           static struct mtx sys##_mutex;                          \
           MTX_SYSINIT(sys##_mutex, &sys##_mutex, name, MTX_DEF)
   #define ACPI_SERIAL_BEGIN(sys)          sx_xlock(&sys##_sxlock)
   #define ACPI_SERIAL_END(sys)            sx_xunlock(&sys##_sxlock)
   #define ACPI_SERIAL_ASSERT(sys)         sx_assert(&sys##_sxlock, SX_XLOCKED);
   #define ACPI_SERIAL_DECL(sys, name)                             \
           static struct sx sys##_sxlock;                          \
           SX_SYSINIT(sys##_sxlock, &sys##_sxlock, name)
   
   /*
    * ACPI CA does not define layers for non-ACPI CA drivers.
    * We define some here within the range provided.
    */
   #define ACPI_AC_ADAPTER         0x00010000
   #define ACPI_BATTERY            0x00020000
   #define ACPI_BUS                0x00040000
   #define ACPI_BUTTON             0x00080000
   #define ACPI_EC                 0x00100000
   #define ACPI_FAN                0x00200000
   #define ACPI_POWERRES           0x00400000
   #define ACPI_PROCESSOR          0x00800000
   #define ACPI_THERMAL            0x01000000
   #define ACPI_TIMER              0x02000000
   #define ACPI_OEM                0x04000000
   
   /*
    * Constants for different interrupt models used with acpi_SetIntrModel().
    */
   #define ACPI_INTR_PIC           0
   #define ACPI_INTR_APIC          1
   #define ACPI_INTR_SAPIC         2
   
   /*
    * Various features and capabilities for the acpi_get_features() method.
    * In particular, these are used for the ACPI 3.0 _PDC and _OSC methods.
    * See the Intel document titled "Intel Processor Vendor-Specific ACPI",
    * number 302223-007.
    */
   #define ACPI_CAP_PERF_MSRS      (1 << 0)  /* Intel SpeedStep PERF_CTL MSRs */
   #define ACPI_CAP_C1_IO_HALT     (1 << 1)  /* Intel C1 "IO then halt" sequence */
   #define ACPI_CAP_THR_MSRS       (1 << 2)  /* Intel OnDemand throttling MSRs */
   #define ACPI_CAP_SMP_SAME       (1 << 3)  /* MP C1, Px, and Tx (all the same) */
   #define ACPI_CAP_SMP_SAME_C3    (1 << 4)  /* MP C2 and C3 (all the same) */
   #define ACPI_CAP_SMP_DIFF_PX    (1 << 5)  /* MP Px (different, using _PSD) */
   #define ACPI_CAP_SMP_DIFF_CX    (1 << 6)  /* MP Cx (different, using _CSD) */
   #define ACPI_CAP_SMP_DIFF_TX    (1 << 7)  /* MP Tx (different, using _TSD) */
   #define ACPI_CAP_SMP_C1_NATIVE  (1 << 8)  /* MP C1 support other than halt */
   #define ACPI_CAP_SMP_C3_NATIVE  (1 << 9)  /* MP C2 and C3 support */
   #define ACPI_CAP_PX_HW_COORD    (1 << 11) /* Intel P-state HW coordination */
   #define ACPI_CAP_INTR_CPPC      (1 << 12) /* Native Interrupt Handling for
                Collaborative Processor Performance Control notifications */
   #define ACPI_CAP_HW_DUTY_C      (1 << 13) /* Hardware Duty Cycling */
   
   /*
    * Quirk flags.
    *
    * ACPI_Q_BROKEN: Disables all ACPI support.
    * ACPI_Q_TIMER: Disables support for the ACPI timer.
    * ACPI_Q_MADT_IRQ0: Specifies that ISA IRQ 0 is wired up to pin 0 of the
    *      first APIC and that the MADT should force that by ignoring the PC-AT
    *      compatible flag and ignoring overrides that redirect IRQ 0 to pin 2.
    */
   extern int      acpi_quirks;
   #define ACPI_Q_OK               0
   #define ACPI_Q_BROKEN           (1 << 0)
   #define ACPI_Q_TIMER            (1 << 1)
   #define ACPI_Q_MADT_IRQ0        (1 << 2)
   
   /*
    * Plug and play information for device matching.  Matching table format
    * is compatible with ids parameter of ACPI_ID_PROBE bus method.
    *
    * XXX: While ACPI_ID_PROBE matches against _HID and all _CIDs, current
    *      acpi_pnpinfo() exports only _HID and first _CID.  That means second
    *      and further _CIDs should be added to both acpi_pnpinfo() and
    *      ACPICOMPAT_PNP_INFO if device matching against them is required.
    */
   #define ACPICOMPAT_PNP_INFO(t, busname)                                 \
           MODULE_PNP_INFO("Z:_HID", busname, t##hid, t, nitems(t)-1);     \
           MODULE_PNP_INFO("Z:_CID", busname, t##cid, t, nitems(t)-1);
   #define ACPI_PNP_INFO(t)        ACPICOMPAT_PNP_INFO(t, acpi)
   
   /*
    * Note that the low ivar values are reserved to provide
    * interface compatibility with ISA drivers which can also
    * attach to ACPI.
    */
   #define ACPI_IVAR_HANDLE        0x100
   #define ACPI_IVAR_UNUSED        0x101   /* Unused/reserved. */
   #define ACPI_IVAR_PRIVATE       0x102
   #define ACPI_IVAR_FLAGS         0x103
   
   /*
    * Accessor functions for our ivars.  Default value for BUS_READ_IVAR is
    * (type) 0.  The <sys/bus.h> accessor functions don't check return values.
    */
   #define __ACPI_BUS_ACCESSOR(varp, var, ivarp, ivar, type)       \
                                                                   \
   static __inline type varp ## _get_ ## var(device_t dev)         \
   {                                                               \
       uintptr_t v = 0;                                            \
       BUS_READ_IVAR(device_get_parent(dev), dev,                  \
           ivarp ## _IVAR_ ## ivar, &v);                           \
       return ((type) v);                                          \
   }                                                               \
                                                                   \
   static __inline void varp ## _set_ ## var(device_t dev, type t) \
   {                                                               \
       uintptr_t v = (uintptr_t) t;                                \
       BUS_WRITE_IVAR(device_get_parent(dev), dev,                 \
           ivarp ## _IVAR_ ## ivar, v);                            \
   }
   
   __ACPI_BUS_ACCESSOR(acpi, handle, ACPI, HANDLE, ACPI_HANDLE)
   __ACPI_BUS_ACCESSOR(acpi, private, ACPI, PRIVATE, void *)
   __ACPI_BUS_ACCESSOR(acpi, flags, ACPI, FLAGS, int)
   
   void acpi_fake_objhandler(ACPI_HANDLE h, void *data);
   static __inline device_t
   acpi_get_device(ACPI_HANDLE handle)
   {
       void *dev = NULL;
       AcpiGetData(handle, acpi_fake_objhandler, &dev);
       return ((device_t)dev);
   }
   
   static __inline 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 (ACPI_FAILURE(AcpiGetType(h, &t)))
           return (ACPI_TYPE_NOT_FOUND);
       return (t);
   }
   
   /* Find the difference between two PM tick counts. */
   static __inline uint32_t
   acpi_TimerDelta(uint32_t end, uint32_t start)
   {
   
           if (end < start && (AcpiGbl_FADT.Flags & ACPI_FADT_32BIT_TIMER) == 0)
                   end |= 0x01000000;
           return (end - start);
   }
   
   #ifdef ACPI_DEBUGGER
   void            acpi_EnterDebugger(void);
   #endif
   
   #ifdef ACPI_DEBUG
   #include <sys/cons.h>
   #define STEP(x)         do {printf x, printf("\n"); cngetc();} while (0)
   #else
   #define STEP(x)
   #endif
   
   #define ACPI_VPRINT(dev, acpi_sc, x...) do {                    \
       if (acpi_get_verbose(acpi_sc))                              \
           device_printf(dev, x);                                  \
   } while (0)
   
   /* Values for the first status word returned by _OSC. */
   #define ACPI_OSC_FAILURE        (1 << 1)
   #define ACPI_OSC_BAD_UUID       (1 << 2)
   #define ACPI_OSC_BAD_REVISION   (1 << 3)
   #define ACPI_OSC_CAPS_MASKED    (1 << 4)
   
   #define ACPI_DEVINFO_PRESENT(x, flags)                                  \
           (((x) & (flags)) == (flags))
   #define ACPI_DEVICE_PRESENT(x)                                          \
           ACPI_DEVINFO_PRESENT(x, ACPI_STA_DEVICE_PRESENT |               \
               ACPI_STA_DEVICE_FUNCTIONING)
   #define ACPI_BATTERY_PRESENT(x)                                         \
           ACPI_DEVINFO_PRESENT(x, ACPI_STA_DEVICE_PRESENT |               \
               ACPI_STA_DEVICE_FUNCTIONING | ACPI_STA_BATTERY_PRESENT)
   
   /* Callback function type for walking subtables within a table. */
   typedef void acpi_subtable_handler(ACPI_SUBTABLE_HEADER *, void *);
   
   BOOLEAN         acpi_DeviceIsPresent(device_t dev);
   BOOLEAN         acpi_BatteryIsPresent(device_t dev);
   ACPI_STATUS     acpi_GetHandleInScope(ACPI_HANDLE parent, char *path,
                       ACPI_HANDLE *result);
   ACPI_STATUS     acpi_GetProperty(device_t dev, ACPI_STRING propname,
                       const ACPI_OBJECT **value);
   ACPI_BUFFER     *acpi_AllocBuffer(int size);
   ACPI_STATUS     acpi_ConvertBufferToInteger(ACPI_BUFFER *bufp,
                       UINT32 *number);
   ACPI_STATUS     acpi_GetInteger(ACPI_HANDLE handle, char *path,
                       UINT32 *number);
   ACPI_STATUS     acpi_SetInteger(ACPI_HANDLE handle, char *path,
                       UINT32 number);
   ACPI_STATUS     acpi_ForeachPackageObject(ACPI_OBJECT *obj, 
                       void (*func)(ACPI_OBJECT *comp, void *arg), void *arg);
   ACPI_STATUS     acpi_FindIndexedResource(ACPI_BUFFER *buf, int index,
                       ACPI_RESOURCE **resp);
   ACPI_STATUS     acpi_AppendBufferResource(ACPI_BUFFER *buf,
                       ACPI_RESOURCE *res);
   UINT64          acpi_DSMQuery(ACPI_HANDLE h, const uint8_t *uuid,
                       int revision);
   ACPI_STATUS     acpi_EvaluateDSM(ACPI_HANDLE handle, const uint8_t *uuid,
                       int revision, UINT64 function, ACPI_OBJECT *package,
                       ACPI_BUFFER *out_buf);
   ACPI_STATUS     acpi_EvaluateDSMTyped(ACPI_HANDLE handle,
                       const uint8_t *uuid, int revision, UINT64 function,
                       ACPI_OBJECT *package, ACPI_BUFFER *out_buf,
                       ACPI_OBJECT_TYPE type);
   ACPI_STATUS     acpi_EvaluateOSC(ACPI_HANDLE handle, uint8_t *uuid,
                       int revision, int count, uint32_t *caps_in,
                       uint32_t *caps_out, bool query);
   ACPI_STATUS     acpi_OverrideInterruptLevel(UINT32 InterruptNumber);
   ACPI_STATUS     acpi_SetIntrModel(int model);
   int             acpi_ReqSleepState(struct acpi_softc *sc, int state);
   int             acpi_AckSleepState(struct apm_clone_data *clone, int error);
   ACPI_STATUS     acpi_SetSleepState(struct acpi_softc *sc, int state);
   int             acpi_wake_set_enable(device_t dev, int enable);
   int             acpi_parse_prw(ACPI_HANDLE h, struct acpi_prw_data *prw);
   ACPI_STATUS     acpi_Startup(void);
   void            acpi_UserNotify(const char *subsystem, ACPI_HANDLE h,
                       uint8_t notify);
   int             acpi_bus_alloc_gas(device_t dev, int *type, int *rid,
                       ACPI_GENERIC_ADDRESS *gas, struct resource **res,
                       u_int flags);
   void            acpi_walk_subtables(void *first, void *end,
                       acpi_subtable_handler *handler, void *arg);
   BOOLEAN         acpi_has_hid(ACPI_HANDLE handle);
   int             acpi_MatchHid(ACPI_HANDLE h, const char *hid);
   #define ACPI_MATCHHID_NOMATCH 0
   #define ACPI_MATCHHID_HID 1
   #define ACPI_MATCHHID_CID 2
   
   static __inline bool
   acpi_HasProperty(device_t dev, ACPI_STRING propname)
   {
   
           return ACPI_SUCCESS(acpi_GetProperty(dev, propname, NULL));
   }
   
   struct acpi_parse_resource_set {
       void        (*set_init)(device_t dev, void *arg, void **context);
       void        (*set_done)(device_t dev, void *context);
       void        (*set_ioport)(device_t dev, void *context, uint64_t base,
                       uint64_t length);
       void        (*set_iorange)(device_t dev, void *context, uint64_t low,
                       uint64_t high, uint64_t length, uint64_t align);
       void        (*set_memory)(device_t dev, void *context, uint64_t base,
                       uint64_t length);
       void        (*set_memoryrange)(device_t dev, void *context, uint64_t low,
                       uint64_t high, uint64_t length, uint64_t align);
       void        (*set_irq)(device_t dev, void *context, uint8_t *irq,
                       int count, int trig, int pol);
       void        (*set_ext_irq)(device_t dev, void *context, uint32_t *irq,
                       int count, int trig, int pol);
       void        (*set_drq)(device_t dev, void *context, uint8_t *drq,
                       int count);
       void        (*set_start_dependent)(device_t dev, void *context,
                       int preference);
       void        (*set_end_dependent)(device_t dev, void *context);
   };
   
   extern struct   acpi_parse_resource_set acpi_res_parse_set;
   
   int             acpi_identify(void);
   void            acpi_config_intr(device_t dev, ACPI_RESOURCE *res);
   #ifdef INTRNG
   int             acpi_map_intr(device_t dev, u_int irq, ACPI_HANDLE handle);
   #endif
   ACPI_STATUS     acpi_lookup_irq_resource(device_t dev, int rid,
                       struct resource *res, ACPI_RESOURCE *acpi_res);
   ACPI_STATUS     acpi_parse_resources(device_t dev, ACPI_HANDLE handle,
                       struct acpi_parse_resource_set *set, void *arg);
   struct resource *acpi_alloc_sysres(device_t child, int type, int *rid,
                       rman_res_t start, rman_res_t end, rman_res_t count,
                       u_int flags);
   
   /* ACPI event handling */
   UINT32          acpi_event_power_button_sleep(void *context);
   UINT32          acpi_event_power_button_wake(void *context);
   UINT32          acpi_event_sleep_button_sleep(void *context);
   UINT32          acpi_event_sleep_button_wake(void *context);
   
   #define ACPI_EVENT_PRI_FIRST      0
   #define ACPI_EVENT_PRI_DEFAULT    10000
   #define ACPI_EVENT_PRI_LAST       20000
   
   typedef void (*acpi_event_handler_t)(void *, int);
   
   EVENTHANDLER_DECLARE(acpi_sleep_event, acpi_event_handler_t);
   EVENTHANDLER_DECLARE(acpi_wakeup_event, acpi_event_handler_t);
   EVENTHANDLER_DECLARE(acpi_acad_event, acpi_event_handler_t);
   EVENTHANDLER_DECLARE(acpi_video_event, acpi_event_handler_t);
   
   /* Device power control. */
   ACPI_STATUS     acpi_pwr_wake_enable(ACPI_HANDLE consumer, int enable);
   ACPI_STATUS     acpi_pwr_switch_consumer(ACPI_HANDLE consumer, int state);
   int             acpi_device_pwr_for_sleep(device_t bus, device_t dev,
                       int *dstate);
   int             acpi_set_powerstate(device_t child, int state);
   
   /* APM emulation */
   void            acpi_apm_init(struct acpi_softc *);
   
   /* Misc. */
   static __inline struct acpi_softc *
   acpi_device_get_parent_softc(device_t child)
   {
       device_t    parent;
   
       parent = device_get_parent(child);
       if (parent == NULL)
           return (NULL);
       return (device_get_softc(parent));
   }
   
   static __inline int
   acpi_get_verbose(struct acpi_softc *sc)
   {
       if (sc)
           return (sc->acpi_verbose);
       return (0);
   }
   
   char            *acpi_name(ACPI_HANDLE handle);
   int             acpi_avoid(ACPI_HANDLE handle);
   int             acpi_disabled(char *subsys);
   int             acpi_get_acpi_device_path(device_t bus, device_t child,
                       const char *locator, struct sbuf *sb);
   int             acpi_machdep_init(device_t dev);
   void            acpi_install_wakeup_handler(struct acpi_softc *sc);
   int             acpi_sleep_machdep(struct acpi_softc *sc, int state);
   int             acpi_wakeup_machdep(struct acpi_softc *sc, int state,
                       int sleep_result, int intr_enabled);
   int             acpi_table_quirks(int *quirks);
   int             acpi_machdep_quirks(int *quirks);
   int             acpi_pnpinfo(ACPI_HANDLE handle, struct sbuf *sb);
   
   uint32_t        hpet_get_uid(device_t dev);
   
   /* Battery Abstraction. */
   struct acpi_battinfo;
   
   int             acpi_battery_register(device_t dev);
   int             acpi_battery_remove(device_t dev);
   int             acpi_battery_get_units(void);
   int             acpi_battery_get_info_expire(void);
   int             acpi_battery_bst_valid(struct acpi_bst *bst);
   int             acpi_battery_bix_valid(struct acpi_bix *bix);
   int             acpi_battery_get_battinfo(device_t dev,
                       struct acpi_battinfo *info);
   
   /* Embedded controller. */
   void            acpi_ec_ecdt_probe(device_t);
   
   /* AC adapter interface. */
   int             acpi_acad_get_acline(int *);
   
   /* Package manipulation convenience functions. */
   #define ACPI_PKG_VALID(pkg, size)                               \
       ((pkg) != NULL && (pkg)->Type == ACPI_TYPE_PACKAGE &&       \
        (pkg)->Package.Count >= (size))
   #define ACPI_PKG_VALID_EQ(pkg, size)                            \
       ((pkg) != NULL && (pkg)->Type == ACPI_TYPE_PACKAGE &&       \
        (pkg)->Package.Count == (size))
   int             acpi_PkgInt(ACPI_OBJECT *res, int idx, UINT64 *dst);
   int             acpi_PkgInt32(ACPI_OBJECT *res, int idx, uint32_t *dst);
   int             acpi_PkgInt16(ACPI_OBJECT *res, int idx, uint16_t *dst);
   int             acpi_PkgStr(ACPI_OBJECT *res, int idx, void *dst, size_t size);
   int             acpi_PkgGas(device_t dev, ACPI_OBJECT *res, int idx, int *type,
                       int *rid, struct resource **dst, u_int flags);
   int             acpi_PkgFFH_IntelCpu(ACPI_OBJECT *res, int idx, int *vendor,
                       int *class, uint64_t *address, int *accsize);
   ACPI_HANDLE     acpi_GetReference(ACPI_HANDLE scope, ACPI_OBJECT *obj);
   
   /*
    * Base level for BUS_ADD_CHILD.  Special devices are added at orders less
    * than this, and normal devices at or above this level.  This keeps the
    * probe order sorted so that things like sysresource are available before
    * their children need them.
    */
   #define ACPI_DEV_BASE_ORDER     100
   
   /* Default maximum number of tasks to enqueue. */
   #ifndef ACPI_MAX_TASKS
   #define ACPI_MAX_TASKS          MAX(32, MAXCPU * 4)
   #endif
   
   /* Default number of task queue threads to start. */
   #ifndef ACPI_MAX_THREADS
   #define ACPI_MAX_THREADS        3
   #endif
   
   /* Use the device logging level for ktr(4). */
   #define KTR_ACPI                KTR_DEV
   
   SYSCTL_DECL(_debug_acpi);
   
   /*
    * Parse and use proximity information in SRAT and SLIT.
    */
   int             acpi_pxm_init(int ncpus, vm_paddr_t maxphys);
   void            acpi_pxm_parse_tables(void);
   void            acpi_pxm_set_mem_locality(void);
   void            acpi_pxm_set_cpu_locality(void);
   int             acpi_pxm_get_cpu_locality(int apic_id);
   
   /*
    * Map a PXM to a VM domain.
    *
    * Returns the VM domain ID if found, or -1 if not found / invalid.
    */
   int             acpi_map_pxm_to_vm_domainid(int pxm);
   int             acpi_get_cpus(device_t dev, device_t child, enum cpu_sets op,
                       size_t setsize, cpuset_t *cpuset);
   int             acpi_get_domain(device_t dev, device_t child, int *domain);
   
   #ifdef __aarch64__
   /*
    * ARM specific ACPI interfaces, relating to IORT table.
    */
   int     acpi_iort_map_pci_msi(u_int seg, u_int rid, u_int *xref, u_int *devid);
   int     acpi_iort_map_pci_smmuv3(u_int seg, u_int rid, u_int *xref, u_int *devid);
   int     acpi_iort_its_lookup(u_int its_id, u_int *xref, int *pxm);
   int     acpi_iort_map_named_msi(const char *devname, u_int rid, u_int *xref,
               u_int *devid);
   int     acpi_iort_map_named_smmuv3(const char *devname, u_int rid, u_int *xref,
               u_int *devid);
   #endif
   #endif /* _KERNEL */
   #endif /* !_ACPIVAR_H_ */

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