[deliverable/linux.git] / kernel / power / disk.c

/*
 * kernel/power/disk.c - Suspend-to-disk support.
 *
 * Copyright (c) 2003 Patrick Mochel
 * Copyright (c) 2003 Open Source Development Lab
 * Copyright (c) 2004 Pavel Machek <pavel@suse.cz>
 *
 * This file is released under the GPLv2.
 *
 */

#include <linux/suspend.h>
#include <linux/syscalls.h>
#include <linux/reboot.h>
#include <linux/string.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/mount.h>

#include "power.h"


extern suspend_disk_method_t pm_disk_mode;
extern struct pm_ops * pm_ops;

extern int swsusp_suspend(void);
extern int swsusp_write(void);
extern int swsusp_check(void);
extern int swsusp_read(void);
extern void swsusp_close(void);
extern int swsusp_resume(void);
extern int swsusp_free(void);


static int noresume = 0;
char resume_file[256] = CONFIG_PM_STD_PARTITION;
dev_t swsusp_resume_device;

/**
 *	power_down - Shut machine down for hibernate.
 *	@mode:		Suspend-to-disk mode
 *
 *	Use the platform driver, if configured so, and return gracefully if it
 *	fails.
 *	Otherwise, try to power off and reboot. If they fail, halt the machine,
 *	there ain't no turning back.
 */

static void power_down(suspend_disk_method_t mode)
{
	unsigned long flags;
	int error = 0;

	local_irq_save(flags);
	switch(mode) {
	case PM_DISK_PLATFORM:
 		device_shutdown();
		error = pm_ops->enter(PM_SUSPEND_DISK);
		break;
	case PM_DISK_SHUTDOWN:
		kernel_power_off();
		break;
	case PM_DISK_REBOOT:
		kernel_restart(NULL);
		break;
	}
	kernel_halt();
	/* Valid image is on the disk, if we continue we risk serious data corruption
	   after resume. */
	printk(KERN_CRIT "Please power me down manually\n");
	while(1);
}


static int in_suspend __nosavedata = 0;


/**
 *	free_some_memory -  Try to free as much memory as possible
 *
 *	... but do not OOM-kill anyone
 *
 *	Notice: all userland should be stopped at this point, or
 *	livelock is possible.
 */

static void free_some_memory(void)
{
	unsigned int i = 0;
	unsigned int tmp;
	unsigned long pages = 0;
	char *p = "-\\|/";

	printk("Freeing memory...  ");
	while ((tmp = shrink_all_memory(10000))) {
		pages += tmp;
		printk("\b%c", p[i]);
		i++;
		if (i > 3)
			i = 0;
	}
	printk("\bdone (%li pages freed)\n", pages);
}


static inline void platform_finish(void)
{
	if (pm_disk_mode == PM_DISK_PLATFORM) {
		if (pm_ops && pm_ops->finish)
			pm_ops->finish(PM_SUSPEND_DISK);
	}
}

static int prepare_processes(void)
{
	int error;

	pm_prepare_console();
	sys_sync();
	disable_nonboot_cpus();

	if (freeze_processes()) {
		error = -EBUSY;
		goto thaw;
	}

	if (pm_disk_mode == PM_DISK_PLATFORM) {
		if (pm_ops && pm_ops->prepare) {
			if ((error = pm_ops->prepare(PM_SUSPEND_DISK)))
				goto thaw;
		}
	}

	/* Free memory before shutting down devices. */
	free_some_memory();
	return 0;
thaw:
	thaw_processes();
	enable_nonboot_cpus();
	pm_restore_console();
	return error;
}

static void unprepare_processes(void)
{
	platform_finish();
	thaw_processes();
	enable_nonboot_cpus();
	pm_restore_console();
}

/**
 *	pm_suspend_disk - The granpappy of power management.
 *
 *	If we're going through the firmware, then get it over with quickly.
 *
 *	If not, then call swsusp to do its thing, then figure out how
 *	to power down the system.
 */

int pm_suspend_disk(void)
{
	int error;

	error = prepare_processes();
	if (error)
		return error;

	error = device_suspend(PMSG_FREEZE);
	if (error) {
		printk("Some devices failed to suspend\n");
		unprepare_processes();
		return error;
	}

	pr_debug("PM: snapshotting memory.\n");
	in_suspend = 1;
	if ((error = swsusp_suspend()))
		goto Done;

	if (in_suspend) {
		pr_debug("PM: writing image.\n");
		error = swsusp_write();
		if (!error)
			power_down(pm_disk_mode);
		else {
		/* swsusp_write can not fail in device_resume,
		   no need to do second device_resume */
			swsusp_free();
			unprepare_processes();
			return error;
		}
	} else
		pr_debug("PM: Image restored successfully.\n");

	swsusp_free();
 Done:
	device_resume();
	unprepare_processes();
	return error;
}


/**
 *	software_resume - Resume from a saved image.
 *
 *	Called as a late_initcall (so all devices are discovered and
 *	initialized), we call swsusp to see if we have a saved image or not.
 *	If so, we quiesce devices, the restore the saved image. We will
 *	return above (in pm_suspend_disk() ) if everything goes well.
 *	Otherwise, we fail gracefully and return to the normally
 *	scheduled program.
 *
 */

static int software_resume(void)
{
	int error;

	down(&pm_sem);
	if (!swsusp_resume_device) {
		if (!strlen(resume_file)) {
			up(&pm_sem);
			return -ENOENT;
		}
		swsusp_resume_device = name_to_dev_t(resume_file);
		pr_debug("swsusp: Resume From Partition %s\n", resume_file);
	} else {
		pr_debug("swsusp: Resume From Partition %d:%d\n",
			 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
	}

	if (noresume) {
		/**
		 * FIXME: If noresume is specified, we need to find the partition
		 * and reset it back to normal swap space.
		 */
		up(&pm_sem);
		return 0;
	}

	pr_debug("PM: Checking swsusp image.\n");

	if ((error = swsusp_check()))
		goto Done;

	pr_debug("PM: Preparing processes for restore.\n");

	if ((error = prepare_processes())) {
		swsusp_close();
		goto Done;
	}

	pr_debug("PM: Reading swsusp image.\n");

	if ((error = swsusp_read()))
		goto Cleanup;

	pr_debug("PM: Preparing devices for restore.\n");

	if ((error = device_suspend(PMSG_FREEZE))) {
		printk("Some devices failed to suspend\n");
		goto Free;
	}

	mb();

	pr_debug("PM: Restoring saved image.\n");
	swsusp_resume();
	pr_debug("PM: Restore failed, recovering.n");
	device_resume();
 Free:
	swsusp_free();
 Cleanup:
	unprepare_processes();
 Done:
	/* For success case, the suspend path will release the lock */
	up(&pm_sem);
	pr_debug("PM: Resume from disk failed.\n");
	return 0;
}

late_initcall(software_resume);


static char * pm_disk_modes[] = {
	[PM_DISK_FIRMWARE]	= "firmware",
	[PM_DISK_PLATFORM]	= "platform",
	[PM_DISK_SHUTDOWN]	= "shutdown",
	[PM_DISK_REBOOT]	= "reboot",
};

/**
 *	disk - Control suspend-to-disk mode
 *
 *	Suspend-to-disk can be handled in several ways. The greatest
 *	distinction is who writes memory to disk - the firmware or the OS.
 *	If the firmware does it, we assume that it also handles suspending
 *	the system.
 *	If the OS does it, then we have three options for putting the system
 *	to sleep - using the platform driver (e.g. ACPI or other PM registers),
 *	powering off the system or rebooting the system (for testing).
 *
 *	The system will support either 'firmware' or 'platform', and that is
 *	known a priori (and encoded in pm_ops). But, the user may choose
 *	'shutdown' or 'reboot' as alternatives.
 *
 *	show() will display what the mode is currently set to.
 *	store() will accept one of
 *
 *	'firmware'
 *	'platform'
 *	'shutdown'
 *	'reboot'
 *
 *	It will only change to 'firmware' or 'platform' if the system
 *	supports it (as determined from pm_ops->pm_disk_mode).
 */

static ssize_t disk_show(struct subsystem * subsys, char * buf)
{
	return sprintf(buf, "%s\n", pm_disk_modes[pm_disk_mode]);
}


static ssize_t disk_store(struct subsystem * s, const char * buf, size_t n)
{
	int error = 0;
	int i;
	int len;
	char *p;
	suspend_disk_method_t mode = 0;

	p = memchr(buf, '\n', n);
	len = p ? p - buf : n;

	down(&pm_sem);
	for (i = PM_DISK_FIRMWARE; i < PM_DISK_MAX; i++) {
		if (!strncmp(buf, pm_disk_modes[i], len)) {
			mode = i;
			break;
		}
	}
	if (mode) {
		if (mode == PM_DISK_SHUTDOWN || mode == PM_DISK_REBOOT)
			pm_disk_mode = mode;
		else {
			if (pm_ops && pm_ops->enter &&
			    (mode == pm_ops->pm_disk_mode))
				pm_disk_mode = mode;
			else
				error = -EINVAL;
		}
	} else
		error = -EINVAL;

	pr_debug("PM: suspend-to-disk mode set to '%s'\n",
		 pm_disk_modes[mode]);
	up(&pm_sem);
	return error ? error : n;
}

power_attr(disk);

static ssize_t resume_show(struct subsystem * subsys, char *buf)
{
	return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
		       MINOR(swsusp_resume_device));
}

static ssize_t resume_store(struct subsystem * subsys, const char * buf, size_t n)
{
	int len;
	char *p;
	unsigned int maj, min;
	int error = -EINVAL;
	dev_t res;

	p = memchr(buf, '\n', n);
	len = p ? p - buf : n;

	if (sscanf(buf, "%u:%u", &maj, &min) == 2) {
		res = MKDEV(maj,min);
		if (maj == MAJOR(res) && min == MINOR(res)) {
			down(&pm_sem);
			swsusp_resume_device = res;
			up(&pm_sem);
			printk("Attempting manual resume\n");
			noresume = 0;
			software_resume();
		}
	}

	return error >= 0 ? n : error;
}

power_attr(resume);

static struct attribute * g[] = {
	&disk_attr.attr,
	&resume_attr.attr,
	NULL,
};


static struct attribute_group attr_group = {
	.attrs = g,
};


static int __init pm_disk_init(void)
{
	return sysfs_create_group(&power_subsys.kset.kobj,&attr_group);
}

core_initcall(pm_disk_init);


static int __init resume_setup(char *str)
{
	if (noresume)
		return 1;

	strncpy( resume_file, str, 255 );
	return 1;
}

static int __init noresume_setup(char *str)
{
	noresume = 1;
	return 1;
}

__setup("noresume", noresume_setup);
__setup("resume=", resume_setup);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* kernel/power/disk.c - Suspend-to-disk support.
	3	*
	4	* Copyright (c) 2003 Patrick Mochel
	5	* Copyright (c) 2003 Open Source Development Lab
	6	* Copyright (c) 2004 Pavel Machek <pavel@suse.cz>
	7	*
	8	* This file is released under the GPLv2.
	9	*
	10	*/
	11
	12	#include <linux/suspend.h>
	13	#include <linux/syscalls.h>
	14	#include <linux/reboot.h>
	15	#include <linux/string.h>
	16	#include <linux/device.h>
	17	#include <linux/delay.h>
	18	#include <linux/fs.h>
d53d9f16 AM	19	#include <linux/mount.h>
d53d9f16 AM	20
1da177e4 LT	21	#include "power.h"
	22
	23
	24	extern suspend_disk_method_t pm_disk_mode;
	25	extern struct pm_ops * pm_ops;
	26
	27	extern int swsusp_suspend(void);
	28	extern int swsusp_write(void);
	29	extern int swsusp_check(void);
	30	extern int swsusp_read(void);
	31	extern void swsusp_close(void);
	32	extern int swsusp_resume(void);
	33	extern int swsusp_free(void);
	34
	35
	36	static int noresume = 0;
	37	char resume_file[256] = CONFIG_PM_STD_PARTITION;
	38	dev_t swsusp_resume_device;
	39
	40	/**
	41	* power_down - Shut machine down for hibernate.
	42	* @mode: Suspend-to-disk mode
	43	*
	44	* Use the platform driver, if configured so, and return gracefully if it
	45	* fails.
	46	* Otherwise, try to power off and reboot. If they fail, halt the machine,
	47	* there ain't no turning back.
	48	*/
	49
	50	static void power_down(suspend_disk_method_t mode)
	51	{
	52	unsigned long flags;
	53	int error = 0;
	54
	55	local_irq_save(flags);
	56	switch(mode) {
	57	case PM_DISK_PLATFORM:
	58	device_shutdown();
	59	error = pm_ops->enter(PM_SUSPEND_DISK);
	60	break;
	61	case PM_DISK_SHUTDOWN:
fdde86ac	62	kernel_power_off();
1da177e4 LT	63	break;
1da177e4 LT	64	case PM_DISK_REBOOT:
fdde86ac	65	kernel_restart(NULL);
1da177e4 LT	66	break;
1da177e4 LT	67	}
fdde86ac	68	kernel_halt();
1da177e4 LT	69	/* Valid image is on the disk, if we continue we risk serious data corruption
	70	after resume. */
	71	printk(KERN_CRIT "Please power me down manually\n");
	72	while(1);
	73	}
	74
	75
	76	static int in_suspend __nosavedata = 0;
	77
	78
	79	/**
	80	* free_some_memory - Try to free as much memory as possible
	81	*
	82	* ... but do not OOM-kill anyone
	83	*
	84	* Notice: all userland should be stopped at this point, or
	85	* livelock is possible.
	86	*/
	87
	88	static void free_some_memory(void)
	89	{
	90	unsigned int i = 0;
	91	unsigned int tmp;
	92	unsigned long pages = 0;
	93	char *p = "-\\\|/";
	94
	95	printk("Freeing memory... ");
	96	while ((tmp = shrink_all_memory(10000))) {
	97	pages += tmp;
	98	printk("\b%c", p[i]);
	99	i++;
	100	if (i > 3)
	101	i = 0;
	102	}
	103	printk("\bdone (%li pages freed)\n", pages);
	104	}
	105
	106
	107	static inline void platform_finish(void)
	108	{
	109	if (pm_disk_mode == PM_DISK_PLATFORM) {
	110	if (pm_ops && pm_ops->finish)
	111	pm_ops->finish(PM_SUSPEND_DISK);
	112	}
	113	}
	114
1da177e4 LT	115	static int prepare_processes(void)
	116	{
	117	int error;
	118
	119	pm_prepare_console();
1da177e4	120	sys_sync();
5a72e04d LS	121	disable_nonboot_cpus();
5a72e04d LS	122
1da177e4 LT	123	if (freeze_processes()) {
1da177e4 LT	124	error = -EBUSY;
5a72e04d	125	goto thaw;
1da177e4 LT	126	}
	127
	128	if (pm_disk_mode == PM_DISK_PLATFORM) {
	129	if (pm_ops && pm_ops->prepare) {
	130	if ((error = pm_ops->prepare(PM_SUSPEND_DISK)))
5a72e04d	131	goto thaw;
1da177e4 LT	132	}
	133	}
	134
	135	/* Free memory before shutting down devices. */
	136	free_some_memory();
1da177e4	137	return 0;
5a72e04d LS	138	thaw:
	139	thaw_processes();
	140	enable_nonboot_cpus();
	141	pm_restore_console();
	142	return error;
1da177e4 LT	143	}
	144
	145	static void unprepare_processes(void)
	146	{
5a72e04d	147	platform_finish();
1da177e4	148	thaw_processes();
5a72e04d	149	enable_nonboot_cpus();
1da177e4 LT	150	pm_restore_console();
	151	}
	152
1da177e4 LT	153	/**
	154	* pm_suspend_disk - The granpappy of power management.
	155	*
	156	* If we're going through the firmware, then get it over with quickly.
	157	*
	158	* If not, then call swsusp to do its thing, then figure out how
	159	* to power down the system.
	160	*/
	161
	162	int pm_suspend_disk(void)
	163	{
	164	int error;
	165
	166	error = prepare_processes();
5a72e04d LS	167	if (error)
5a72e04d LS	168	return error;
1da177e4	169
99dc7d63	170	error = device_suspend(PMSG_FREEZE);
1da177e4	171	if (error) {
99dc7d63	172	printk("Some devices failed to suspend\n");
1da177e4 LT	173	unprepare_processes();
	174	return error;
	175	}
	176
1da177e4 LT	177	pr_debug("PM: snapshotting memory.\n");
	178	in_suspend = 1;
	179	if ((error = swsusp_suspend()))
	180	goto Done;
	181
	182	if (in_suspend) {
	183	pr_debug("PM: writing image.\n");
	184	error = swsusp_write();
	185	if (!error)
	186	power_down(pm_disk_mode);
99dc7d63 PM	187	else {
	188	/* swsusp_write can not fail in device_resume,
	189	no need to do second device_resume */
	190	swsusp_free();
	191	unprepare_processes();
	192	return error;
	193	}
1da177e4 LT	194	} else
1da177e4 LT	195	pr_debug("PM: Image restored successfully.\n");
99dc7d63	196
1da177e4 LT	197	swsusp_free();
1da177e4 LT	198	Done:
99dc7d63 PM	199	device_resume();
99dc7d63 PM	200	unprepare_processes();
1da177e4 LT	201	return error;
	202	}
	203
	204
	205	/**
	206	* software_resume - Resume from a saved image.
	207	*
	208	* Called as a late_initcall (so all devices are discovered and
	209	* initialized), we call swsusp to see if we have a saved image or not.
	210	* If so, we quiesce devices, the restore the saved image. We will
	211	* return above (in pm_suspend_disk() ) if everything goes well.
	212	* Otherwise, we fail gracefully and return to the normally
	213	* scheduled program.
	214	*
	215	*/
	216
	217	static int software_resume(void)
	218	{
	219	int error;
	220
dd5d666b	221	down(&pm_sem);
3efa147a	222	if (!swsusp_resume_device) {
dd5d666b SL	223	if (!strlen(resume_file)) {
dd5d666b SL	224	up(&pm_sem);
3efa147a	225	return -ENOENT;
dd5d666b	226	}
3efa147a PM	227	swsusp_resume_device = name_to_dev_t(resume_file);
	228	pr_debug("swsusp: Resume From Partition %s\n", resume_file);
	229	} else {
	230	pr_debug("swsusp: Resume From Partition %d:%d\n",
	231	MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
	232	}
	233
1da177e4 LT	234	if (noresume) {
	235	/**
	236	* FIXME: If noresume is specified, we need to find the partition
	237	* and reset it back to normal swap space.
	238	*/
dd5d666b	239	up(&pm_sem);
1da177e4 LT	240	return 0;
	241	}
	242
	243	pr_debug("PM: Checking swsusp image.\n");
	244
	245	if ((error = swsusp_check()))
	246	goto Done;
	247
	248	pr_debug("PM: Preparing processes for restore.\n");
	249
	250	if ((error = prepare_processes())) {
	251	swsusp_close();
5a72e04d	252	goto Done;
1da177e4 LT	253	}
	254
	255	pr_debug("PM: Reading swsusp image.\n");
	256
	257	if ((error = swsusp_read()))
	258	goto Cleanup;
	259
	260	pr_debug("PM: Preparing devices for restore.\n");
	261
99dc7d63 PM	262	if ((error = device_suspend(PMSG_FREEZE))) {
99dc7d63 PM	263	printk("Some devices failed to suspend\n");
1da177e4	264	goto Free;
99dc7d63	265	}
1da177e4 LT	266
	267	mb();
	268
	269	pr_debug("PM: Restoring saved image.\n");
	270	swsusp_resume();
	271	pr_debug("PM: Restore failed, recovering.n");
99dc7d63	272	device_resume();
1da177e4 LT	273	Free:
	274	swsusp_free();
	275	Cleanup:
	276	unprepare_processes();
	277	Done:
dd5d666b SL	278	/* For success case, the suspend path will release the lock */
dd5d666b SL	279	up(&pm_sem);
1da177e4 LT	280	pr_debug("PM: Resume from disk failed.\n");
	281	return 0;
	282	}
	283
	284	late_initcall(software_resume);
	285
	286
	287	static char * pm_disk_modes[] = {
	288	[PM_DISK_FIRMWARE] = "firmware",
	289	[PM_DISK_PLATFORM] = "platform",
	290	[PM_DISK_SHUTDOWN] = "shutdown",
	291	[PM_DISK_REBOOT] = "reboot",
	292	};
	293
	294	/**
	295	* disk - Control suspend-to-disk mode
	296	*
	297	* Suspend-to-disk can be handled in several ways. The greatest
	298	* distinction is who writes memory to disk - the firmware or the OS.
	299	* If the firmware does it, we assume that it also handles suspending
	300	* the system.
	301	* If the OS does it, then we have three options for putting the system
	302	* to sleep - using the platform driver (e.g. ACPI or other PM registers),
	303	* powering off the system or rebooting the system (for testing).
	304	*
	305	* The system will support either 'firmware' or 'platform', and that is
	306	* known a priori (and encoded in pm_ops). But, the user may choose
	307	* 'shutdown' or 'reboot' as alternatives.
	308	*
	309	* show() will display what the mode is currently set to.
	310	* store() will accept one of
	311	*
	312	* 'firmware'
	313	* 'platform'
	314	* 'shutdown'
	315	* 'reboot'
	316	*
	317	* It will only change to 'firmware' or 'platform' if the system
	318	* supports it (as determined from pm_ops->pm_disk_mode).
	319	*/
	320
	321	static ssize_t disk_show(struct subsystem * subsys, char * buf)
	322	{
	323	return sprintf(buf, "%s\n", pm_disk_modes[pm_disk_mode]);
	324	}
	325
	326
	327	static ssize_t disk_store(struct subsystem * s, const char * buf, size_t n)
	328	{
	329	int error = 0;
	330	int i;
	331	int len;
	332	char *p;
	333	suspend_disk_method_t mode = 0;
	334
	335	p = memchr(buf, '\n', n);
	336	len = p ? p - buf : n;
	337
	338	down(&pm_sem);
	339	for (i = PM_DISK_FIRMWARE; i < PM_DISK_MAX; i++) {
	340	if (!strncmp(buf, pm_disk_modes[i], len)) {
	341	mode = i;
	342	break;
	343	}
344	}
345	if (mode) {
346	if (mode == PM_DISK_SHUTDOWN \|\| mode == PM_DISK_REBOOT)
347	pm_disk_mode = mode;
348	else {
349	if (pm_ops && pm_ops->enter &&
350	(mode == pm_ops->pm_disk_mode))
351	pm_disk_mode = mode;
352	else
353	error = -EINVAL;
354	}
355	} else
356	error = -EINVAL;
357
358	pr_debug("PM: suspend-to-disk mode set to '%s'\n",
359	pm_disk_modes[mode]);
360	up(&pm_sem);
361	return error ? error : n;
362	}
363
364	power_attr(disk);
365
366	static ssize_t resume_show(struct subsystem * subsys, char *buf)
367	{
368	return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
369	MINOR(swsusp_resume_device));
370	}
371
372	static ssize_t resume_store(struct subsystem * subsys, const char * buf, size_t n)
373	{
374	int len;
375	char *p;
376	unsigned int maj, min;
377	int error = -EINVAL;
378	dev_t res;
379
380	p = memchr(buf, '\n', n);
381	len = p ? p - buf : n;
382
383	if (sscanf(buf, "%u:%u", &maj, &min) == 2) {
384	res = MKDEV(maj,min);
385	if (maj == MAJOR(res) && min == MINOR(res)) {
dd5d666b	386	down(&pm_sem);
1da177e4	387	swsusp_resume_device = res;
dd5d666b	388	up(&pm_sem);
1da177e4 LT	389	printk("Attempting manual resume\n");
	390	noresume = 0;
	391	software_resume();
	392	}
	393	}
	394
	395	return error >= 0 ? n : error;
	396	}
	397
	398	power_attr(resume);
	399
	400	static struct attribute * g[] = {
	401	&disk_attr.attr,
	402	&resume_attr.attr,
	403	NULL,
	404	};
	405
	406
	407	static struct attribute_group attr_group = {
	408	.attrs = g,
	409	};
	410
	411
	412	static int __init pm_disk_init(void)
	413	{
	414	return sysfs_create_group(&power_subsys.kset.kobj,&attr_group);
	415	}
	416
	417	core_initcall(pm_disk_init);
	418
	419
	420	static int __init resume_setup(char *str)
	421	{
	422	if (noresume)
	423	return 1;
	424
	425	strncpy( resume_file, str, 255 );
	426	return 1;
	427	}
	428
	429	static int __init noresume_setup(char *str)
	430	{
	431	noresume = 1;
	432	return 1;
	433	}
	434
	435	__setup("noresume", noresume_setup);
	436	__setup("resume=", resume_setup);