system.c File Reference

#include <precomp.h>
#include <debug.h>

Include dependency graph for system.c:

Go to the source code of this file.

Classes
struct	acpi_system

Macros
#define	NDEBUG
#define	_COMPONENT   ACPI_SYSTEM_COMPONENT
#define	PREFIX   "ACPI: "

Functions
ACPI_STATUS	acpi_system_save_state (UINT32)
static int	acpi_system_add (struct acpi_device *device)
static int	acpi_system_remove (struct acpi_device *device, int type)
ACPI_STATUS	acpi_suspend (UINT32 state)
ACPI_STATUS	acpi_system_restore_state (UINT32 state)
ACPI_STATUS	acpi_system_suspend (UINT32 state)
int	acpi_system_init (void)
void	acpi_system_exit (void)

Variables
static struct acpi_driver	acpi_system_driver

Macro Definition Documentation

_COMPONENT

#define _COMPONENT   ACPI_SYSTEM_COMPONENT

Definition at line 37 of file system.c.

NDEBUG

#define NDEBUG

Definition at line 32 of file system.c.

PREFIX

#define PREFIX   "ACPI: "

Definition at line 40 of file system.c.

Function Documentation

acpi_suspend()

ACPI_STATUS acpi_suspend

(

UINT32

state

)

acpi_suspend - OS-agnostic system suspend/resume support (S? states) @state: state we're entering

Definition at line 347 of file system.c.

{
    ACPI_STATUS status;

    /* only support S1 and S5 on kernel 2.4 */
    //if (state != ACPI_STATE_S1 && state != ACPI_STATE_S4
    //    && state != ACPI_STATE_S5)
    //  return AE_ERROR;


    //if (ACPI_STATE_S4 == state) {
    //  /* For s4bios, we need a wakeup address. */
    //  if (1 == AcpiGbl_FACS->S4bios_f &&
    //      0 != AcpiGbl_FADT->smi_cmd) {
    //      if (!acpi_wakeup_address)
    //          return AE_ERROR;
    //      AcpiSetFirmwareWakingVector((acpi_physical_address) acpi_wakeup_address);
    //  } else
    //      /* We don't support S4 under 2.4.  Give up */
    //      return AE_ERROR;
    //}
    AcpiEnterSleepStatePrep(state);

    status = AcpiEnterSleepState(state);
    if (!ACPI_SUCCESS(status) && state != ACPI_STATE_S5)
        return status;

    /* disable interrupts and flush caches */
    _disable();
    ACPI_FLUSH_CPU_CACHE();

    /* perform OS-specific sleep actions */
    status = acpi_system_suspend(state);

    /* Even if we failed to go to sleep, all of the devices are in an suspended
     * mode. So, we run these unconditionally to make sure we have a usable system
     * no matter what.
     */
    AcpiLeaveSleepState(state);
    acpi_system_restore_state(state);

    /* make sure interrupts are enabled */
    _enable();

    /* reset firmware waking vector */
    AcpiSetFirmwareWakingVector(0, 0);

    return status;
}

Referenced by Bus_FDO_Power().

acpi_system_add()

static int acpi_system_add ( struct acpi_device *  device )

static

Definition at line 65 of file system.c.

{
    ACPI_STATUS     status = AE_OK;
    struct acpi_system  *system = NULL;
    UINT8           i = 0;

    ACPI_FUNCTION_TRACE("acpi_system_add");

    if (!device)
        return_VALUE(-1);

    system = ExAllocatePoolWithTag(NonPagedPool,sizeof(struct acpi_system),'IPCA');
    if (!system)
        return_VALUE(-14);
    memset(system, 0, sizeof(struct acpi_system));

    system->handle = device->handle;
    sprintf(acpi_device_name(device), "%s", ACPI_SYSTEM_DEVICE_NAME);
    sprintf(acpi_device_class(device), "%s", ACPI_SYSTEM_CLASS);
    acpi_driver_data(device) = system;

    DPRINT("%s [%s] (supports", 
        acpi_device_name(device), acpi_device_bid(device));
    for (i=0; i<ACPI_S_STATE_COUNT; i++) {
        UINT8 type_a, type_b;
        status = AcpiGetSleepTypeData(i, &type_a, &type_b);
        switch (i) {
        case ACPI_STATE_S4:
            if (/*AcpiGbl_FACS->S4bios_f &&*/
                0 != AcpiGbl_FADT.SmiCommand) {
                DPRINT(" S4bios\n");
                system->states[i] = 1;
            }
            /* no break */
        default: 
            if (ACPI_SUCCESS(status)) {
                system->states[i] = 1;
                DPRINT(" S%d", i);
            }
        }
    }

//#ifdef CONFIG_PM
//  /* Install the soft-off (S5) handler. */
//  if (system->states[ACPI_STATE_S5]) {
//      pm_power_off = acpi_power_off;
//      register_sysrq_key('o', &sysrq_acpi_poweroff_op);
//  }
//#endif

    return_VALUE(0);
}

acpi_system_exit()

void acpi_system_exit

(

void

)

Definition at line 414 of file system.c.

{
    ACPI_FUNCTION_TRACE("acpi_system_exit");
    acpi_bus_unregister_driver(&acpi_system_driver);
    return_VOID;
}

Referenced by acpi_bus_exit().

acpi_system_init()

int acpi_system_init

(

void

)

Definition at line 399 of file system.c.

{
    int         result = 0;

    ACPI_FUNCTION_TRACE("acpi_system_init");

    result = acpi_bus_register_driver(&acpi_system_driver);
    if (result < 0)
        return_VALUE(AE_NOT_FOUND);

    return_VALUE(0);
}

Referenced by acpi_init().

acpi_system_remove()

static int acpi_system_remove ( struct acpi_device *  device, int  type  )

static

Definition at line 120 of file system.c.

{
    struct acpi_system  *system = NULL;

    ACPI_FUNCTION_TRACE("acpi_system_remove");

    if (!device || !acpi_driver_data(device))
        return_VALUE(-1);

    system = (struct acpi_system *) acpi_driver_data(device);

//#ifdef CONFIG_PM
//  /* Remove the soft-off (S5) handler. */
//  if (system->states[ACPI_STATE_S5]) {
//      unregister_sysrq_key('o', &sysrq_acpi_poweroff_op);
//      pm_power_off = NULL;
//  }
//#endif
//
//
    ExFreePoolWithTag(system, 'IPCA');

    return 0;
}

acpi_system_restore_state()

ACPI_STATUS acpi_system_restore_state

(

UINT32

state

)

acpi_system_restore_state - OS-specific restoration of state @state: sleep state we're exiting

Note that if we're coming back from S4, the memory image should have already been loaded from the disk and is already in place. (Otherwise how else would we be here?).

Definition at line 156 of file system.c.

{
    /* 
     * We should only be here if we're coming back from STR or STD.
     * And, in the case of the latter, the memory image should have already
     * been loaded from disk.
     */
    if (state > ACPI_STATE_S1) {
        //acpi_restore_state_mem();

        /* Do _early_ resume for irqs.  Required by
         * ACPI specs.
         */
        /* TBD: call arch dependant reinitialization of the 
         * interrupts.
         */
#ifdef _X86_
        //init_8259A(0);
#endif
        /* wait for power to come back */
        KeStallExecutionProcessor(100);

    }

    /* Be really sure that irqs are disabled. */
    //ACPI_DISABLE_IRQS();

    /* Wait a little again, just in case... */
    KeStallExecutionProcessor(10);

    /* enable interrupts once again */
    //ACPI_ENABLE_IRQS();

    /* turn all the devices back on */
    //if (state > ACPI_STATE_S1)
        //pm_send_all(PM_RESUME, (void *)0);

    return AE_OK;
}

Referenced by acpi_suspend().

acpi_system_save_state()

ACPI_STATUS acpi_system_save_state

(

UINT32

state

)

acpi_system_save_state - save OS specific state and power down devices @state: sleep state we're entering.

This handles saving all context to memory, and possibly disk. First, we call to the device driver layer to save device state. Once we have that, we save whatevery processor and kernel state we need to memory. If we're entering S4, we then write the memory image to disk.

Only then it is safe for us to power down devices, since we may need the disks and upstream buses to write to.

Definition at line 212 of file system.c.

{
    int         error = 0;

    /* Send notification to devices that they will be suspended.
     * If any device or driver cannot make the transition, either up
     * or down, we'll get an error back.
     */
    /*if (state > ACPI_STATE_S1) {
        error = pm_send_all(PM_SAVE_STATE, (void *)3);
        if (error)
            return AE_ERROR;
    }*/

    //if (state <= ACPI_STATE_S5) {
    //  /* Tell devices to stop I/O and actually save their state.
    //   * It is theoretically possible that something could fail,
    //   * so handle that gracefully..
    //   */
    //  if (state > ACPI_STATE_S1 && state != ACPI_STATE_S5) {
    //      error = pm_send_all(PM_SUSPEND, (void *)3);
    //      if (error) {
    //          /* Tell devices to restore state if they have
    //           * it saved and to start taking I/O requests.
    //           */
    //          pm_send_all(PM_RESUME, (void *)0);
    //          return error;
    //      }
    //  }
        
        /* flush caches */
        ACPI_FLUSH_CPU_CACHE();

        /* Do arch specific saving of state. */
        if (state > ACPI_STATE_S1) {
            error = 0;//acpi_save_state_mem();

            /* TBD: if no s4bios, write codes for
             * acpi_save_state_disk()...
             */
#if 0
            if (!error && (state == ACPI_STATE_S4))
                error = acpi_save_state_disk();
#endif
            /*if (error) {
                pm_send_all(PM_RESUME, (void *)0);
                return error;
            }*/
        }
    //}
    /* disable interrupts
     * Note that acpi_suspend -- our caller -- will do this once we return.
     * But, we want it done early, so we don't get any surprises during
     * the device suspend sequence.
     */
    //ACPI_DISABLE_IRQS();

    /* Unconditionally turn off devices.
     * Obvious if we enter a sleep state.
     * If entering S5 (soft off), this should put devices in a
     * quiescent state.
     */

    //if (state > ACPI_STATE_S1) {
    //  error = pm_send_all(PM_SUSPEND, (void *)3);

    //  /* We're pretty screwed if we got an error from this.
    //   * We try to recover by simply calling our own restore_state
    //   * function; see above for definition.
    //   *
    //   * If it's S5 though, go through with it anyway..
    //   */
    //  if (error && state != ACPI_STATE_S5)
    //      acpi_system_restore_state(state);
    //}
    return error ? AE_ERROR : AE_OK;
}

acpi_system_suspend()

ACPI_STATUS acpi_system_suspend

(

UINT32

state

)

Definition at line 313 of file system.c.

{
    ACPI_STATUS     status = AE_ERROR;
    //unsigned long     flags = 0;

    //local_irq_save(flags);
    /* kernel_fpu_begin(); */

    switch (state) {
    case ACPI_STATE_S1:
    case ACPI_STATE_S5:
        //barrier();
        status = AcpiEnterSleepState(state);
        break;
    case ACPI_STATE_S4:
        //do_suspend_lowlevel_s4bios(0);
        break;
    }

    /* kernel_fpu_end(); */
    //local_irq_restore(flags);

    return status;
}

Referenced by acpi_suspend().

Variable Documentation

acpi_system_driver

struct acpi_driver acpi_system_driver

static

Initial value:

= {
    {0,0},
    ACPI_SYSTEM_DRIVER_NAME,
    ACPI_SYSTEM_CLASS,
    0,
    0,
    ACPI_SYSTEM_HID,
    {acpi_system_add, acpi_system_remove}
}

Definition at line 47 of file system.c.

Referenced by acpi_system_exit(), and acpi_system_init().