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)
   5 #include <asm/suspend.h>
   6 #endif
   7 #include <linux/swap.h>
   8 #include <linux/notifier.h>
   9 #include <linux/config.h>
  10 #include <linux/init.h>
  11 #include <linux/pm.h>
  12
  13 /* page backup entry */
  14 typedef struct pbe {
  15         unsigned long address;          /* address of the copy */
  16         unsigned long orig_address;     /* original address of page */
  17         swp_entry_t swap_address;
  18
  19         struct pbe *next;       /* also used as scratch space at
  20                                  * end of page (see link, diskpage)
  21                                  */
  22 } suspend_pagedir_t;
  23
  24 #define for_each_pbe(pbe, pblist) \
  25         for (pbe = pblist ; pbe ; pbe = pbe->next)
  26
  27 #define PBES_PER_PAGE      (PAGE_SIZE/sizeof(struct pbe))
  28 #define PB_PAGE_SKIP       (PBES_PER_PAGE-1)
  29
  30 #define for_each_pb_page(pbe, pblist) \
  31         for (pbe = pblist ; pbe ; pbe = (pbe+PB_PAGE_SKIP)->next)
  32
  33
  34 #define SWAP_FILENAME_MAXLENGTH 32
  35
  36
  37 extern dev_t swsusp_resume_device;
  38
  39 /* mm/vmscan.c */
  40 extern int shrink_mem(void);
  41
  42 /* mm/page_alloc.c */
  43 extern void drain_local_pages(void);
  44 extern void mark_free_pages(struct zone *zone);
  45
  46 #ifdef CONFIG_PM
  47 /* kernel/power/swsusp.c */
  48 extern int software_suspend(void);
  49
  50 extern int pm_prepare_console(void);
  51 extern void pm_restore_console(void);
  52
  53 #else
  54 static inline int software_suspend(void)
  55 {
  56         printk("Warning: fake suspend called\n");
  57         return -EPERM;
  58 }
  59 #endif
  60
  61 #ifdef CONFIG_SUSPEND_SMP
  62 extern void disable_nonboot_cpus(void);
  63 extern void enable_nonboot_cpus(void);
  64 #else
  65 static inline void disable_nonboot_cpus(void) {}
  66 static inline void enable_nonboot_cpus(void) {}
  67 #endif
  68
  69 void save_processor_state(void);
  70 void restore_processor_state(void);
  71 struct saved_context;
  72 void __save_processor_state(struct saved_context *ctxt);
  73 void __restore_processor_state(struct saved_context *ctxt);
  74 extern unsigned long get_usable_page(gfp_t gfp_mask);
  75 extern void free_eaten_memory(void);
  76
  77 /*
  78  * XXX: We try to keep some more pages free so that I/O operations succeed
  79  * without paging. Might this be more?
  80  */
  81 #define PAGES_FOR_IO    512
  82
  83 #endif /* _LINUX_SWSUSP_H */