acpi_status
acpi_system_suspend(
u32 state)
{
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 = acpi_enter_sleep_state(state);
break;
case ACPI_STATE_S4:
do_suspend_lowlevel_s4bios(0);
break;
}
/* kernel_fpu_end(); */
local_irq_restore(flags);
return status;
}
static int acpi_pm_enter(suspend_state_t pm_state)
{
acpi_status status = AE_OK;
unsigned long flags = 0;
u32 acpi_state = acpi_suspend_states[pm_state];
ACPI_FLUSH_CPU_CACHE();
/* Do arch specific saving of state. */
if (pm_state > PM_SUSPEND_STANDBY) {
int error = acpi_save_state_mem();
if (error)
return error;
}
local_irq_save(flags);
acpi_enable_wakeup_device(acpi_state);
switch (pm_state) {
case PM_SUSPEND_STANDBY:
barrier();
status = acpi_enter_sleep_state(acpi_state);
break;
case PM_SUSPEND_MEM:
do_suspend_lowlevel();
break;
case PM_SUSPEND_DISK:
if (acpi_pm_ops.pm_disk_mode == PM_DISK_PLATFORM)
status = acpi_enter_sleep_state(acpi_state);
else
do_suspend_lowlevel_s4bios();
break;
case PM_SUSPEND_MAX:
acpi_power_off();
break;
default:
return -EINVAL;
}
local_irq_restore(flags);
printk(KERN_DEBUG "Back to C!\n");
/* restore processor state
* 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 (pm_state > PM_SUSPEND_STANDBY)
acpi_restore_state_mem();
return ACPI_SUCCESS(status) ? 0 : -EFAULT;
}
