/*
* Acquire a spinlock.
*
* handle is a pointer to the spinlock_t.
* flags is *not* the result of save_flags - it is an ACPI-specific flag variable
* that indicates whether we are at interrupt level.
*/
void
acpi_os_acquire_lock (
acpi_handle handle,
u32 flags)
{
ACPI_FUNCTION_TRACE ("os_acquire_lock");
ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Acquiring spinlock[%p] from %s level\n", handle,
((flags & ACPI_NOT_ISR) ? "non-interrupt" : "interrupt")));
if (flags & ACPI_NOT_ISR)
ACPI_DISABLE_IRQS();
spin_lock((spinlock_t *)handle);
return_VOID;
}
/**
* 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?).
*/
acpi_status
acpi_system_restore_state(
u32 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 (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 CONFIG_X86
init_8259A(0);
#endif
/* wait for power to come back */
mdelay(1000);
}
/* Be really sure that irqs are disabled. */
ACPI_DISABLE_IRQS();
/* Wait a little again, just in case... */
mdelay(1000);
/* 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;
}
/**
* 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.
*/
acpi_status
acpi_system_save_state(
u32 state)
{
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 = 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 suprises 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;
}
int
acpi_sleep_machdep(struct acpi_softc *sc, int state)
{
ACPI_STATUS status;
struct pmap *pm;
int ret;
uint32_t cr3;
u_long ef;
ret = 0;
if (sc->acpi_wakeaddr == 0)
return (0);
AcpiSetFirmwareWakingVector(sc->acpi_wakephys);
ef = read_eflags();
/*
* Temporarily switch to the kernel pmap because it provides an
* identity mapping (setup at boot) for the low physical memory
* region containing the wakeup code.
*/
pm = kernel_pmap;
cr3 = rcr3();
#ifdef PAE
load_cr3(vtophys(pm->pm_pdpt));
#else
load_cr3(vtophys(pm->pm_pdir));
#endif
ret_addr = 0;
ACPI_DISABLE_IRQS();
if (acpi_savecpu()) {
/* Execute Sleep */
intr_suspend();
p_gdt = (struct region_descriptor *)
(sc->acpi_wakeaddr + physical_gdt);
p_gdt->rd_limit = saved_gdt.rd_limit;
p_gdt->rd_base = vtophys(saved_gdt.rd_base);
WAKECODE_FIXUP(physical_esp, uint32_t, vtophys(r_esp));
WAKECODE_FIXUP(previous_cr0, uint32_t, r_cr0);
WAKECODE_FIXUP(previous_cr2, uint32_t, r_cr2);
WAKECODE_FIXUP(previous_cr3, uint32_t, r_cr3);
WAKECODE_FIXUP(previous_cr4, uint32_t, r_cr4);
WAKECODE_FIXUP(resume_beep, uint32_t, acpi_resume_beep);
WAKECODE_FIXUP(reset_video, uint32_t, acpi_reset_video);
WAKECODE_FIXUP(previous_tr, uint16_t, r_tr);
WAKECODE_BCOPY(previous_gdt, struct region_descriptor, saved_gdt);
WAKECODE_FIXUP(previous_ldt, uint16_t, saved_ldt);
WAKECODE_BCOPY(previous_idt, struct region_descriptor, saved_idt);
WAKECODE_FIXUP(where_to_recover, void *, acpi_restorecpu);
WAKECODE_FIXUP(previous_ds, uint16_t, r_ds);
WAKECODE_FIXUP(previous_es, uint16_t, r_es);
WAKECODE_FIXUP(previous_fs, uint16_t, r_fs);
WAKECODE_FIXUP(previous_gs, uint16_t, r_gs);
WAKECODE_FIXUP(previous_ss, uint16_t, r_ss);
if (bootverbose)
acpi_printcpu();
/* Call ACPICA to enter the desired sleep state */
if (state == ACPI_STATE_S4 && sc->acpi_s4bios)
status = AcpiEnterSleepStateS4bios();
else
status = AcpiEnterSleepState(state);
if (status != AE_OK) {
device_printf(sc->acpi_dev,
"AcpiEnterSleepState failed - %s\n",
AcpiFormatException(status));
ret = -1;
goto out;
}
for (;;) ;
} else {
/* Execute Wakeup */
intr_resume();
if (bootverbose) {
acpi_savecpu();
acpi_printcpu();
}
}
out:
load_cr3(cr3);
write_eflags(ef);
/* If we beeped, turn it off after a delay. */
if (acpi_resume_beep)
timeout(acpi_stop_beep, NULL, 3 * hz);
return (ret);
}
