1 #include <linux/suspend.h>
2 #include <linux/suspend_ioctls.h>
3 #include <linux/utsname.h>
6 struct new_utsname uts;
8 unsigned long num_physpages;
10 unsigned long image_pages;
13 } __attribute__((aligned(PAGE_SIZE)));
15 #ifdef CONFIG_HIBERNATION
16 #ifdef CONFIG_ARCH_HIBERNATION_HEADER
17 /* Maximum size of architecture specific data in a hibernation header */
18 #define MAX_ARCH_HEADER_SIZE (sizeof(struct new_utsname) + 4)
20 extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
21 extern int arch_hibernation_header_restore(void *addr);
23 static inline int init_header_complete(struct swsusp_info *info)
25 return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
28 static inline char *check_image_kernel(struct swsusp_info *info)
30 return arch_hibernation_header_restore(info) ?
31 "architecture specific data" : NULL;
33 #endif /* CONFIG_ARCH_HIBERNATION_HEADER */
36 * Keep some memory free so that I/O operations can succeed without paging
37 * [Might this be more than 4 MB?]
39 #define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT)
42 * Keep 1 MB of memory free so that device drivers can allocate some pages in
43 * their .suspend() routines without breaking the suspend to disk.
45 #define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT)
47 /* kernel/power/disk.c */
48 extern int hibernation_snapshot(int platform_mode);
49 extern int hibernation_restore(int platform_mode);
50 extern int hibernation_platform_enter(void);
53 extern int pfn_is_nosave(unsigned long);
55 extern struct mutex pm_mutex;
57 #define power_attr(_name) \
58 static struct kobj_attribute _name##_attr = { \
60 .name = __stringify(_name), \
63 .show = _name##_show, \
64 .store = _name##_store, \
67 /* Preferred image size in bytes (default 500 MB) */
68 extern unsigned long image_size;
69 extern int in_suspend;
70 extern dev_t swsusp_resume_device;
71 extern sector_t swsusp_resume_block;
73 extern asmlinkage int swsusp_arch_suspend(void);
74 extern asmlinkage int swsusp_arch_resume(void);
76 extern int create_basic_memory_bitmaps(void);
77 extern void free_basic_memory_bitmaps(void);
78 extern unsigned int count_data_pages(void);
81 * Auxiliary structure used for reading the snapshot image data and
82 * metadata from and writing them to the list of page backup entries
83 * (PBEs) which is the main data structure of swsusp.
85 * Using struct snapshot_handle we can transfer the image, including its
86 * metadata, as a continuous sequence of bytes with the help of
87 * snapshot_read_next() and snapshot_write_next().
89 * The code that writes the image to a storage or transfers it to
90 * the user land is required to use snapshot_read_next() for this
91 * purpose and it should not make any assumptions regarding the internal
92 * structure of the image. Similarly, the code that reads the image from
93 * a storage or transfers it from the user land is required to use
94 * snapshot_write_next().
96 * This may allow us to change the internal structure of the image
97 * in the future with considerably less effort.
100 struct snapshot_handle {
101 loff_t offset; /* number of the last byte ready for reading
102 * or writing in the sequence
104 unsigned int cur; /* number of the block of PAGE_SIZE bytes the
105 * next operation will refer to (ie. current)
107 unsigned int cur_offset; /* offset with respect to the current
108 * block (for the next operation)
110 unsigned int prev; /* number of the block of PAGE_SIZE bytes that
111 * was the current one previously
113 void *buffer; /* address of the block to read from
116 unsigned int buf_offset; /* location to read from or write to,
117 * given as a displacement from 'buffer'
119 int sync_read; /* Set to one to notify the caller of
120 * snapshot_write_next() that it may
121 * need to call wait_on_bio_chain()
125 /* This macro returns the address from/to which the caller of
126 * snapshot_read_next()/snapshot_write_next() is allowed to
127 * read/write data after the function returns
129 #define data_of(handle) ((handle).buffer + (handle).buf_offset)
131 extern unsigned int snapshot_additional_pages(struct zone *zone);
132 extern unsigned long snapshot_get_image_size(void);
133 extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
134 extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
135 extern void snapshot_write_finalize(struct snapshot_handle *handle);
136 extern int snapshot_image_loaded(struct snapshot_handle *handle);
138 /* If unset, the snapshot device cannot be open. */
139 extern atomic_t snapshot_device_available;
141 extern sector_t alloc_swapdev_block(int swap);
142 extern void free_all_swap_pages(int swap);
143 extern int swsusp_swap_in_use(void);
146 * Flags that can be passed from the hibernatig hernel to the "boot" kernel in
149 #define SF_PLATFORM_MODE 1
151 /* kernel/power/disk.c */
152 extern int swsusp_check(void);
153 extern int swsusp_shrink_memory(void);
154 extern void swsusp_free(void);
155 extern int swsusp_resume(void);
156 extern int swsusp_read(unsigned int *flags_p);
157 extern int swsusp_write(unsigned int flags);
158 extern void swsusp_close(void);
161 /* kernel/power/swsusp.c */
162 extern void swsusp_show_speed(struct timeval *, struct timeval *,
163 unsigned int, char *);
165 #ifdef CONFIG_SUSPEND
166 /* kernel/power/main.c */
167 extern int suspend_devices_and_enter(suspend_state_t state);
168 #else /* !CONFIG_SUSPEND */
169 static inline int suspend_devices_and_enter(suspend_state_t state)
173 #endif /* !CONFIG_SUSPEND */
175 /* kernel/power/common.c */
176 extern struct blocking_notifier_head pm_chain_head;
178 static inline int pm_notifier_call_chain(unsigned long val)
180 return (blocking_notifier_call_chain(&pm_chain_head, val, NULL)
181 == NOTIFY_BAD) ? -EINVAL : 0;
184 #ifdef CONFIG_HIGHMEM
185 unsigned int count_highmem_pages(void);
186 int restore_highmem(void);
188 static inline unsigned int count_highmem_pages(void) { return 0; }
189 static inline int restore_highmem(void) { return 0; }
193 * Suspend test levels
207 #define TEST_FIRST TEST_NONE
208 #define TEST_MAX (__TEST_AFTER_LAST - 1)