include/linux/suspend.h

#ifndef _LINUX_SWSUSP_H
#define _LINUX_SWSUSP_H

#if defined(CONFIG_X86) || defined(CONFIG_FRV) || defined(CONFIG_PPC32)
#include <asm/suspend.h>
#endif
#include <linux/swap.h>
#include <linux/notifier.h>
#include <linux/init.h>
#include <linux/pm.h>
#include <linux/mm.h>

/* struct pbe is used for creating lists of pages that should be restored
 * atomically during the resume from disk, because the page frames they have
 * occupied before the suspend are in use.
 */
struct pbe {
	void *address;		/* address of the copy */
	void *orig_address;	/* original address of a page */
	struct pbe *next;
};

/* mm/page_alloc.c */
extern void drain_local_pages(void);
extern void mark_free_pages(struct zone *zone);

#ifdef CONFIG_PM
/* kernel/power/swsusp.c */
extern int software_suspend(void);

#if defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
extern int pm_prepare_console(void);
extern void pm_restore_console(void);
#else
static inline int pm_prepare_console(void) { return 0; }
static inline void pm_restore_console(void) {}
#endif /* defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE) */
#else
static inline int software_suspend(void)
{
	printk("Warning: fake suspend called\n");
	return -ENOSYS;
}
#endif /* CONFIG_PM */

void save_processor_state(void);
void restore_processor_state(void);
struct saved_context;
void __save_processor_state(struct saved_context *ctxt);
void __restore_processor_state(struct saved_context *ctxt);
unsigned long get_safe_page(gfp_t gfp_mask);

/* Page management functions for the software suspend (swsusp) */

static inline void swsusp_set_page_forbidden(struct page *page)
{
	SetPageNosave(page);
}

static inline int swsusp_page_is_forbidden(struct page *page)
{
	return PageNosave(page);
}

static inline void swsusp_unset_page_forbidden(struct page *page)
{
	ClearPageNosave(page);
}

static inline void swsusp_set_page_free(struct page *page)
{
	SetPageNosaveFree(page);
}

static inline int swsusp_page_is_free(struct page *page)
{
	return PageNosaveFree(page);
}

static inline void swsusp_unset_page_free(struct page *page)
{
	ClearPageNosaveFree(page);
}

/*
 * XXX: We try to keep some more pages free so that I/O operations succeed
 * without paging. Might this be more?
 */
#define PAGES_FOR_IO	1024

#endif /* _LINUX_SWSUSP_H */