include/linux/suspend.h

   1 #ifndef _LINUX_SWSUSP_H
   2 #define _LINUX_SWSUSP_H
   3
   4 #if defined(CONFIG_X86) || defined(CONFIG_FRV) || defined(CONFIG_PPC32) || defined(CONFIG_PPC64)
   5 #include <asm/suspend.h>
   6 #endif
   7 #include <linux/swap.h>
   8 #include <linux/notifier.h>
   9 #include <linux/init.h>
  10 #include <linux/pm.h>
  11 #include <linux/mm.h>
  12
  13 /* struct pbe is used for creating lists of pages that should be restored
  14  * atomically during the resume from disk, because the page frames they have
  15  * occupied before the suspend are in use.
  16  */
  17 struct pbe {
  18         void *address;          /* address of the copy */
  19         void *orig_address;     /* original address of a page */
  20         struct pbe *next;
  21 };
  22
  23 /* mm/page_alloc.c */
  24 extern void drain_local_pages(void);
  25 extern void mark_free_pages(struct zone *zone);
  26
  27 #if defined(CONFIG_PM) && defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
  28 extern int pm_prepare_console(void);
  29 extern void pm_restore_console(void);
  30 #else
  31 static inline int pm_prepare_console(void) { return 0; }
  32 static inline void pm_restore_console(void) {}
  33 #endif
  34
  35 /**
  36  * struct hibernation_ops - hibernation platform support
  37  *
  38  * The methods in this structure allow a platform to override the default
  39  * mechanism of shutting down the machine during a hibernation transition.
  40  *
  41  * All three methods must be assigned.
  42  *
  43  * @prepare: prepare system for hibernation
  44  * @enter: shut down system after state has been saved to disk
  45  * @finish: finish/clean up after state has been reloaded
  46  * @pre_restore: prepare system for the restoration from a hibernation image
  47  * @restore_cleanup: clean up after a failing image restoration
  48  */
  49 struct hibernation_ops {
  50         int (*prepare)(void);
  51         int (*enter)(void);
  52         void (*finish)(void);
  53         int (*pre_restore)(void);
  54         void (*restore_cleanup)(void);
  55 };
  56
  57 #if defined(CONFIG_PM) && defined(CONFIG_SOFTWARE_SUSPEND)
  58 /* kernel/power/snapshot.c */
  59 extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
  60 static inline void register_nosave_region(unsigned long b, unsigned long e)
  61 {
  62         __register_nosave_region(b, e, 0);
  63 }
  64 static inline void register_nosave_region_late(unsigned long b, unsigned long e)
  65 {
  66         __register_nosave_region(b, e, 1);
  67 }
  68 extern int swsusp_page_is_forbidden(struct page *);
  69 extern void swsusp_set_page_free(struct page *);
  70 extern void swsusp_unset_page_free(struct page *);
  71 extern unsigned long get_safe_page(gfp_t gfp_mask);
  72
  73 extern void hibernation_set_ops(struct hibernation_ops *ops);
  74 extern int hibernate(void);
  75 #else
  76 static inline void register_nosave_region(unsigned long b, unsigned long e) {}
  77 static inline void register_nosave_region_late(unsigned long b, unsigned long e) {}
  78 static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
  79 static inline void swsusp_set_page_free(struct page *p) {}
  80 static inline void swsusp_unset_page_free(struct page *p) {}
  81
  82 static inline void hibernation_set_ops(struct hibernation_ops *ops) {}
  83 static inline int hibernate(void) { return -ENOSYS; }
  84 #endif /* defined(CONFIG_PM) && defined(CONFIG_SOFTWARE_SUSPEND) */
  85
  86 void save_processor_state(void);
  87 void restore_processor_state(void);
  88 struct saved_context;
  89 void __save_processor_state(struct saved_context *ctxt);
  90 void __restore_processor_state(struct saved_context *ctxt);
  91
  92 #endif /* _LINUX_SWSUSP_H */