2 * sleep.c - ACPI sleep support.
4 * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
5 * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
6 * Copyright (c) 2000-2003 Patrick Mochel
7 * Copyright (c) 2003 Open Source Development Lab
9 * This file is released under the GPLv2.
13 #include <linux/delay.h>
14 #include <linux/irq.h>
15 #include <linux/dmi.h>
16 #include <linux/device.h>
17 #include <linux/suspend.h>
18 #include <linux/reboot.h>
22 #include <acpi/acpi_bus.h>
23 #include <acpi/acpi_drivers.h>
28 static u8 sleep_states
[ACPI_S_STATE_COUNT
];
30 static void acpi_sleep_tts_switch(u32 acpi_state
)
32 union acpi_object in_arg
= { ACPI_TYPE_INTEGER
};
33 struct acpi_object_list arg_list
= { 1, &in_arg
};
34 acpi_status status
= AE_OK
;
36 in_arg
.integer
.value
= acpi_state
;
37 status
= acpi_evaluate_object(NULL
, "\\_TTS", &arg_list
, NULL
);
38 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
40 * OS can't evaluate the _TTS object correctly. Some warning
41 * message will be printed. But it won't break anything.
43 printk(KERN_NOTICE
"Failure in evaluating _TTS object\n");
47 static int tts_notify_reboot(struct notifier_block
*this,
48 unsigned long code
, void *x
)
50 acpi_sleep_tts_switch(ACPI_STATE_S5
);
54 static struct notifier_block tts_notifier
= {
55 .notifier_call
= tts_notify_reboot
,
60 static int acpi_sleep_prepare(u32 acpi_state
)
62 #ifdef CONFIG_ACPI_SLEEP
63 /* do we have a wakeup address for S2 and S3? */
64 if (acpi_state
== ACPI_STATE_S3
) {
65 if (!acpi_wakeup_address
) {
68 acpi_set_firmware_waking_vector(
69 (acpi_physical_address
)acpi_wakeup_address
);
72 ACPI_FLUSH_CPU_CACHE();
74 printk(KERN_INFO PREFIX
"Preparing to enter system sleep state S%d\n",
76 acpi_enable_wakeup_devices(acpi_state
);
77 acpi_enter_sleep_state_prep(acpi_state
);
81 #ifdef CONFIG_ACPI_SLEEP
82 static u32 acpi_target_sleep_state
= ACPI_STATE_S0
;
85 * The ACPI specification wants us to save NVS memory regions during hibernation
86 * and to restore them during the subsequent resume. Windows does that also for
87 * suspend to RAM. However, it is known that this mechanism does not work on
88 * all machines, so we allow the user to disable it with the help of the
89 * 'acpi_sleep=nonvs' kernel command line option.
91 static bool nvs_nosave
;
93 void __init
acpi_nvs_nosave(void)
99 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
100 * user to request that behavior by using the 'acpi_old_suspend_ordering'
101 * kernel command line option that causes the following variable to be set.
103 static bool old_suspend_ordering
;
105 void __init
acpi_old_suspend_ordering(void)
107 old_suspend_ordering
= true;
111 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
113 static int acpi_pm_freeze(void)
115 acpi_disable_all_gpes();
116 acpi_os_wait_events_complete(NULL
);
117 acpi_ec_block_transactions();
122 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
124 static int acpi_pm_pre_suspend(void)
127 return suspend_nvs_save();
131 * __acpi_pm_prepare - Prepare the platform to enter the target state.
133 * If necessary, set the firmware waking vector and do arch-specific
134 * nastiness to get the wakeup code to the waking vector.
136 static int __acpi_pm_prepare(void)
138 int error
= acpi_sleep_prepare(acpi_target_sleep_state
);
140 acpi_target_sleep_state
= ACPI_STATE_S0
;
146 * acpi_pm_prepare - Prepare the platform to enter the target sleep
147 * state and disable the GPEs.
149 static int acpi_pm_prepare(void)
151 int error
= __acpi_pm_prepare();
153 error
= acpi_pm_pre_suspend();
159 * acpi_pm_finish - Instruct the platform to leave a sleep state.
161 * This is called after we wake back up (or if entering the sleep state
164 static void acpi_pm_finish(void)
166 u32 acpi_state
= acpi_target_sleep_state
;
168 acpi_ec_unblock_transactions();
170 if (acpi_state
== ACPI_STATE_S0
)
173 printk(KERN_INFO PREFIX
"Waking up from system sleep state S%d\n",
175 acpi_disable_wakeup_devices(acpi_state
);
176 acpi_leave_sleep_state(acpi_state
);
178 /* reset firmware waking vector */
179 acpi_set_firmware_waking_vector((acpi_physical_address
) 0);
181 acpi_target_sleep_state
= ACPI_STATE_S0
;
185 * acpi_pm_end - Finish up suspend sequence.
187 static void acpi_pm_end(void)
191 * This is necessary in case acpi_pm_finish() is not called during a
192 * failing transition to a sleep state.
194 acpi_target_sleep_state
= ACPI_STATE_S0
;
195 acpi_sleep_tts_switch(acpi_target_sleep_state
);
197 #else /* !CONFIG_ACPI_SLEEP */
198 #define acpi_target_sleep_state ACPI_STATE_S0
199 #endif /* CONFIG_ACPI_SLEEP */
201 #ifdef CONFIG_SUSPEND
202 extern void do_suspend_lowlevel(void);
204 static u32 acpi_suspend_states
[] = {
205 [PM_SUSPEND_ON
] = ACPI_STATE_S0
,
206 [PM_SUSPEND_STANDBY
] = ACPI_STATE_S1
,
207 [PM_SUSPEND_MEM
] = ACPI_STATE_S3
,
208 [PM_SUSPEND_MAX
] = ACPI_STATE_S5
212 * acpi_suspend_begin - Set the target system sleep state to the state
213 * associated with given @pm_state, if supported.
215 static int acpi_suspend_begin(suspend_state_t pm_state
)
217 u32 acpi_state
= acpi_suspend_states
[pm_state
];
220 error
= nvs_nosave
? 0 : suspend_nvs_alloc();
224 if (sleep_states
[acpi_state
]) {
225 acpi_target_sleep_state
= acpi_state
;
226 acpi_sleep_tts_switch(acpi_target_sleep_state
);
228 printk(KERN_ERR
"ACPI does not support this state: %d\n",
236 * acpi_suspend_enter - Actually enter a sleep state.
239 * Flush caches and go to sleep. For STR we have to call arch-specific
240 * assembly, which in turn call acpi_enter_sleep_state().
241 * It's unfortunate, but it works. Please fix if you're feeling frisky.
243 static int acpi_suspend_enter(suspend_state_t pm_state
)
245 acpi_status status
= AE_OK
;
246 unsigned long flags
= 0;
247 u32 acpi_state
= acpi_target_sleep_state
;
249 ACPI_FLUSH_CPU_CACHE();
251 /* Do arch specific saving of state. */
252 if (acpi_state
== ACPI_STATE_S3
) {
253 int error
= acpi_save_state_mem();
259 local_irq_save(flags
);
260 switch (acpi_state
) {
263 status
= acpi_enter_sleep_state(acpi_state
);
267 do_suspend_lowlevel();
271 /* This violates the spec but is required for bug compatibility. */
272 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE
, 1);
274 /* Reprogram control registers and execute _BFS */
275 acpi_leave_sleep_state_prep(acpi_state
);
277 /* ACPI 3.0 specs (P62) says that it's the responsibility
278 * of the OSPM to clear the status bit [ implying that the
279 * POWER_BUTTON event should not reach userspace ]
281 if (ACPI_SUCCESS(status
) && (acpi_state
== ACPI_STATE_S3
))
282 acpi_clear_event(ACPI_EVENT_POWER_BUTTON
);
285 * Disable and clear GPE status before interrupt is enabled. Some GPEs
286 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
287 * acpi_leave_sleep_state will reenable specific GPEs later
289 acpi_disable_all_gpes();
290 /* Allow EC transactions to happen. */
291 acpi_ec_unblock_transactions_early();
293 local_irq_restore(flags
);
294 printk(KERN_DEBUG
"Back to C!\n");
296 /* restore processor state */
297 if (acpi_state
== ACPI_STATE_S3
)
298 acpi_restore_state_mem();
300 suspend_nvs_restore();
302 return ACPI_SUCCESS(status
) ? 0 : -EFAULT
;
305 static int acpi_suspend_state_valid(suspend_state_t pm_state
)
311 case PM_SUSPEND_STANDBY
:
313 acpi_state
= acpi_suspend_states
[pm_state
];
315 return sleep_states
[acpi_state
];
321 static struct platform_suspend_ops acpi_suspend_ops
= {
322 .valid
= acpi_suspend_state_valid
,
323 .begin
= acpi_suspend_begin
,
324 .prepare_late
= acpi_pm_prepare
,
325 .enter
= acpi_suspend_enter
,
326 .wake
= acpi_pm_finish
,
331 * acpi_suspend_begin_old - Set the target system sleep state to the
332 * state associated with given @pm_state, if supported, and
333 * execute the _PTS control method. This function is used if the
334 * pre-ACPI 2.0 suspend ordering has been requested.
336 static int acpi_suspend_begin_old(suspend_state_t pm_state
)
338 int error
= acpi_suspend_begin(pm_state
);
340 error
= __acpi_pm_prepare();
346 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
349 static struct platform_suspend_ops acpi_suspend_ops_old
= {
350 .valid
= acpi_suspend_state_valid
,
351 .begin
= acpi_suspend_begin_old
,
352 .prepare_late
= acpi_pm_pre_suspend
,
353 .enter
= acpi_suspend_enter
,
354 .wake
= acpi_pm_finish
,
356 .recover
= acpi_pm_finish
,
359 static int __init
init_old_suspend_ordering(const struct dmi_system_id
*d
)
361 old_suspend_ordering
= true;
365 static int __init
init_nvs_nosave(const struct dmi_system_id
*d
)
371 static struct dmi_system_id __initdata acpisleep_dmi_table
[] = {
373 .callback
= init_old_suspend_ordering
,
374 .ident
= "Abit KN9 (nForce4 variant)",
376 DMI_MATCH(DMI_BOARD_VENDOR
, "http://www.abit.com.tw/"),
377 DMI_MATCH(DMI_BOARD_NAME
, "KN9 Series(NF-CK804)"),
381 .callback
= init_old_suspend_ordering
,
382 .ident
= "HP xw4600 Workstation",
384 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
385 DMI_MATCH(DMI_PRODUCT_NAME
, "HP xw4600 Workstation"),
389 .callback
= init_old_suspend_ordering
,
390 .ident
= "Asus Pundit P1-AH2 (M2N8L motherboard)",
392 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTek Computer INC."),
393 DMI_MATCH(DMI_BOARD_NAME
, "M2N8L"),
397 .callback
= init_old_suspend_ordering
,
398 .ident
= "Panasonic CF51-2L",
400 DMI_MATCH(DMI_BOARD_VENDOR
,
401 "Matsushita Electric Industrial Co.,Ltd."),
402 DMI_MATCH(DMI_BOARD_NAME
, "CF51-2L"),
406 .callback
= init_nvs_nosave
,
407 .ident
= "Sony Vaio VGN-SR11M",
409 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
410 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR11M"),
414 .callback
= init_nvs_nosave
,
415 .ident
= "Everex StepNote Series",
417 DMI_MATCH(DMI_SYS_VENDOR
, "Everex Systems, Inc."),
418 DMI_MATCH(DMI_PRODUCT_NAME
, "Everex StepNote Series"),
422 .callback
= init_nvs_nosave
,
423 .ident
= "Sony Vaio VPCEB1Z1E",
425 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
426 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB1Z1E"),
430 .callback
= init_nvs_nosave
,
431 .ident
= "Sony Vaio VGN-NW130D",
433 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
434 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-NW130D"),
439 #endif /* CONFIG_SUSPEND */
441 #ifdef CONFIG_HIBERNATION
442 static unsigned long s4_hardware_signature
;
443 static struct acpi_table_facs
*facs
;
444 static bool nosigcheck
;
446 void __init
acpi_no_s4_hw_signature(void)
451 static int acpi_hibernation_begin(void)
455 error
= nvs_nosave
? 0 : suspend_nvs_alloc();
457 acpi_target_sleep_state
= ACPI_STATE_S4
;
458 acpi_sleep_tts_switch(acpi_target_sleep_state
);
464 static int acpi_hibernation_enter(void)
466 acpi_status status
= AE_OK
;
467 unsigned long flags
= 0;
469 ACPI_FLUSH_CPU_CACHE();
471 local_irq_save(flags
);
472 /* This shouldn't return. If it returns, we have a problem */
473 status
= acpi_enter_sleep_state(ACPI_STATE_S4
);
474 /* Reprogram control registers and execute _BFS */
475 acpi_leave_sleep_state_prep(ACPI_STATE_S4
);
476 local_irq_restore(flags
);
478 return ACPI_SUCCESS(status
) ? 0 : -EFAULT
;
481 static void acpi_hibernation_leave(void)
484 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
488 /* Reprogram control registers and execute _BFS */
489 acpi_leave_sleep_state_prep(ACPI_STATE_S4
);
490 /* Check the hardware signature */
491 if (facs
&& s4_hardware_signature
!= facs
->hardware_signature
) {
492 printk(KERN_EMERG
"ACPI: Hardware changed while hibernated, "
494 panic("ACPI S4 hardware signature mismatch");
496 /* Restore the NVS memory area */
497 suspend_nvs_restore();
498 /* Allow EC transactions to happen. */
499 acpi_ec_unblock_transactions_early();
502 static void acpi_pm_thaw(void)
504 acpi_ec_unblock_transactions();
505 acpi_enable_all_runtime_gpes();
508 static struct platform_hibernation_ops acpi_hibernation_ops
= {
509 .begin
= acpi_hibernation_begin
,
511 .pre_snapshot
= acpi_pm_prepare
,
512 .finish
= acpi_pm_finish
,
513 .prepare
= acpi_pm_prepare
,
514 .enter
= acpi_hibernation_enter
,
515 .leave
= acpi_hibernation_leave
,
516 .pre_restore
= acpi_pm_freeze
,
517 .restore_cleanup
= acpi_pm_thaw
,
521 * acpi_hibernation_begin_old - Set the target system sleep state to
522 * ACPI_STATE_S4 and execute the _PTS control method. This
523 * function is used if the pre-ACPI 2.0 suspend ordering has been
526 static int acpi_hibernation_begin_old(void)
530 * The _TTS object should always be evaluated before the _PTS object.
531 * When the old_suspended_ordering is true, the _PTS object is
532 * evaluated in the acpi_sleep_prepare.
534 acpi_sleep_tts_switch(ACPI_STATE_S4
);
536 error
= acpi_sleep_prepare(ACPI_STATE_S4
);
540 error
= suspend_nvs_alloc();
542 acpi_target_sleep_state
= ACPI_STATE_S4
;
548 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
551 static struct platform_hibernation_ops acpi_hibernation_ops_old
= {
552 .begin
= acpi_hibernation_begin_old
,
554 .pre_snapshot
= acpi_pm_pre_suspend
,
555 .prepare
= acpi_pm_freeze
,
556 .finish
= acpi_pm_finish
,
557 .enter
= acpi_hibernation_enter
,
558 .leave
= acpi_hibernation_leave
,
559 .pre_restore
= acpi_pm_freeze
,
560 .restore_cleanup
= acpi_pm_thaw
,
561 .recover
= acpi_pm_finish
,
563 #endif /* CONFIG_HIBERNATION */
565 int acpi_suspend(u32 acpi_state
)
567 suspend_state_t states
[] = {
568 [1] = PM_SUSPEND_STANDBY
,
569 [3] = PM_SUSPEND_MEM
,
573 if (acpi_state
< 6 && states
[acpi_state
])
574 return pm_suspend(states
[acpi_state
]);
582 * acpi_pm_device_sleep_state - return preferred power state of ACPI device
583 * in the system sleep state given by %acpi_target_sleep_state
584 * @dev: device to examine; its driver model wakeup flags control
585 * whether it should be able to wake up the system
586 * @d_min_p: used to store the upper limit of allowed states range
587 * Return value: preferred power state of the device on success, -ENODEV on
588 * failure (ie. if there's no 'struct acpi_device' for @dev)
590 * Find the lowest power (highest number) ACPI device power state that
591 * device @dev can be in while the system is in the sleep state represented
592 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be
593 * able to wake up the system from this sleep state. If @d_min_p is set,
594 * the highest power (lowest number) device power state of @dev allowed
595 * in this system sleep state is stored at the location pointed to by it.
597 * The caller must ensure that @dev is valid before using this function.
598 * The caller is also responsible for figuring out if the device is
599 * supposed to be able to wake up the system and passing this information
603 int acpi_pm_device_sleep_state(struct device
*dev
, int *d_min_p
)
605 acpi_handle handle
= DEVICE_ACPI_HANDLE(dev
);
606 struct acpi_device
*adev
;
607 char acpi_method
[] = "_SxD";
608 unsigned long long d_min
, d_max
;
610 if (!handle
|| ACPI_FAILURE(acpi_bus_get_device(handle
, &adev
))) {
611 printk(KERN_DEBUG
"ACPI handle has no context!\n");
615 acpi_method
[2] = '0' + acpi_target_sleep_state
;
617 * If the sleep state is S0, we will return D3, but if the device has
618 * _S0W, we will use the value from _S0W
620 d_min
= ACPI_STATE_D0
;
621 d_max
= ACPI_STATE_D3
;
624 * If present, _SxD methods return the minimum D-state (highest power
625 * state) we can use for the corresponding S-states. Otherwise, the
626 * minimum D-state is D0 (ACPI 3.x).
628 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
629 * provided -- that's our fault recovery, we ignore retval.
631 if (acpi_target_sleep_state
> ACPI_STATE_S0
)
632 acpi_evaluate_integer(handle
, acpi_method
, NULL
, &d_min
);
635 * If _PRW says we can wake up the system from the target sleep state,
636 * the D-state returned by _SxD is sufficient for that (we assume a
637 * wakeup-aware driver if wake is set). Still, if _SxW exists
638 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
639 * can wake the system. _S0W may be valid, too.
641 if (acpi_target_sleep_state
== ACPI_STATE_S0
||
642 (device_may_wakeup(dev
) &&
643 adev
->wakeup
.sleep_state
<= acpi_target_sleep_state
)) {
646 acpi_method
[3] = 'W';
647 status
= acpi_evaluate_integer(handle
, acpi_method
, NULL
,
649 if (ACPI_FAILURE(status
)) {
650 if (acpi_target_sleep_state
!= ACPI_STATE_S0
||
651 status
!= AE_NOT_FOUND
)
653 } else if (d_max
< d_min
) {
654 /* Warn the user of the broken DSDT */
655 printk(KERN_WARNING
"ACPI: Wrong value from %s\n",
666 #endif /* CONFIG_PM_OPS */
668 #ifdef CONFIG_PM_SLEEP
670 * acpi_pm_device_sleep_wake - enable or disable the system wake-up
671 * capability of given device
672 * @dev: device to handle
673 * @enable: 'true' - enable, 'false' - disable the wake-up capability
675 int acpi_pm_device_sleep_wake(struct device
*dev
, bool enable
)
678 struct acpi_device
*adev
;
681 if (!device_can_wakeup(dev
))
684 handle
= DEVICE_ACPI_HANDLE(dev
);
685 if (!handle
|| ACPI_FAILURE(acpi_bus_get_device(handle
, &adev
))) {
686 dev_dbg(dev
, "ACPI handle has no context in %s!\n", __func__
);
691 acpi_enable_wakeup_device_power(adev
, acpi_target_sleep_state
) :
692 acpi_disable_wakeup_device_power(adev
);
694 dev_info(dev
, "wake-up capability %s by ACPI\n",
695 enable
? "enabled" : "disabled");
699 #endif /* CONFIG_PM_SLEEP */
701 static void acpi_power_off_prepare(void)
703 /* Prepare to power off the system */
704 acpi_sleep_prepare(ACPI_STATE_S5
);
705 acpi_disable_all_gpes();
708 static void acpi_power_off(void)
710 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
711 printk(KERN_DEBUG
"%s called\n", __func__
);
713 acpi_enter_sleep_state(ACPI_STATE_S5
);
717 * ACPI 2.0 created the optional _GTS and _BFS,
718 * but industry adoption has been neither rapid nor broad.
720 * Linux gets into trouble when it executes poorly validated
721 * paths through the BIOS, so disable _GTS and _BFS by default,
722 * but do speak up and offer the option to enable them.
724 static void __init
acpi_gts_bfs_check(void)
728 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT
, METHOD_NAME__GTS
, &dummy
)))
730 printk(KERN_NOTICE PREFIX
"BIOS offers _GTS\n");
731 printk(KERN_NOTICE PREFIX
"If \"acpi.gts=1\" improves suspend, "
732 "please notify linux-acpi@vger.kernel.org\n");
734 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT
, METHOD_NAME__BFS
, &dummy
)))
736 printk(KERN_NOTICE PREFIX
"BIOS offers _BFS\n");
737 printk(KERN_NOTICE PREFIX
"If \"acpi.bfs=1\" improves resume, "
738 "please notify linux-acpi@vger.kernel.org\n");
742 int __init
acpi_sleep_init(void)
746 #ifdef CONFIG_SUSPEND
749 dmi_check_system(acpisleep_dmi_table
);
755 sleep_states
[ACPI_STATE_S0
] = 1;
756 printk(KERN_INFO PREFIX
"(supports S0");
758 #ifdef CONFIG_SUSPEND
759 for (i
= ACPI_STATE_S1
; i
< ACPI_STATE_S4
; i
++) {
760 status
= acpi_get_sleep_type_data(i
, &type_a
, &type_b
);
761 if (ACPI_SUCCESS(status
)) {
767 suspend_set_ops(old_suspend_ordering
?
768 &acpi_suspend_ops_old
: &acpi_suspend_ops
);
771 #ifdef CONFIG_HIBERNATION
772 status
= acpi_get_sleep_type_data(ACPI_STATE_S4
, &type_a
, &type_b
);
773 if (ACPI_SUCCESS(status
)) {
774 hibernation_set_ops(old_suspend_ordering
?
775 &acpi_hibernation_ops_old
: &acpi_hibernation_ops
);
776 sleep_states
[ACPI_STATE_S4
] = 1;
779 acpi_get_table(ACPI_SIG_FACS
, 1,
780 (struct acpi_table_header
**)&facs
);
782 s4_hardware_signature
=
783 facs
->hardware_signature
;
787 status
= acpi_get_sleep_type_data(ACPI_STATE_S5
, &type_a
, &type_b
);
788 if (ACPI_SUCCESS(status
)) {
789 sleep_states
[ACPI_STATE_S5
] = 1;
791 pm_power_off_prepare
= acpi_power_off_prepare
;
792 pm_power_off
= acpi_power_off
;
796 * Register the tts_notifier to reboot notifier list so that the _TTS
797 * object can also be evaluated when the system enters S5.
799 register_reboot_notifier(&tts_notifier
);
800 acpi_gts_bfs_check();