Hibernation: Arbitrary boot kernel support - generic code

[linux-2.6-omap-h63xx.git] / kernel / power / power.h

diff --git a/kernel/power/power.h b/kernel/power/power.h
index 34b43542785a3859d8e954858346aeb8d409f367..a0204dfc6c4cf054f4d11074c5266e9ebf35bc31 100644 (file)
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -11,26 +11,42 @@ struct swsusp_info {
        unsigned long           size;
 } __attribute__((aligned(PAGE_SIZE)));
 
+#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_ARCH_HIBERNATION_HEADER
+/* Maximum size of architecture specific data in a hibernation header */
+#define MAX_ARCH_HEADER_SIZE   (sizeof(struct new_utsname) + 4)
 
+extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
+extern int arch_hibernation_header_restore(void *addr);
+
+static inline int init_header_complete(struct swsusp_info *info)
+{
+       return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
+}
+
+static inline char *check_image_kernel(struct swsusp_info *info)
+{
+       return arch_hibernation_header_restore(info) ?
+                       "architecture specific data" : NULL;
+}
+#endif /* CONFIG_ARCH_HIBERNATION_HEADER */
 
-#ifdef CONFIG_SOFTWARE_SUSPEND
 /*
  * Keep some memory free so that I/O operations can succeed without paging
  * [Might this be more than 4 MB?]
  */
 #define PAGES_FOR_IO   ((4096 * 1024) >> PAGE_SHIFT)
+
 /*
  * Keep 1 MB of memory free so that device drivers can allocate some pages in
  * their .suspend() routines without breaking the suspend to disk.
  */
 #define SPARE_PAGES    ((1024 * 1024) >> PAGE_SHIFT)
 
-extern int pm_suspend_disk(void);
-#else
-static inline int pm_suspend_disk(void)
-{
-       return -EPERM;
-}
+/* kernel/power/disk.c */
+extern int hibernation_snapshot(int platform_mode);
+extern int hibernation_restore(int platform_mode);
+extern int hibernation_platform_enter(void);
 #endif
 
 extern int pfn_is_nosave(unsigned long);
@@ -157,16 +173,42 @@ extern sector_t alloc_swapdev_block(int swap);
 extern void free_all_swap_pages(int swap);
 extern int swsusp_swap_in_use(void);
 
+/*
+ * Flags that can be passed from the hibernatig hernel to the "boot" kernel in
+ * the image header.
+ */
+#define SF_PLATFORM_MODE       1
+
+/* kernel/power/disk.c */
 extern int swsusp_check(void);
 extern int swsusp_shrink_memory(void);
 extern void swsusp_free(void);
 extern int swsusp_suspend(void);
 extern int swsusp_resume(void);
-extern int swsusp_read(void);
-extern int swsusp_write(void);
+extern int swsusp_read(unsigned int *flags_p);
+extern int swsusp_write(unsigned int flags);
 extern void swsusp_close(void);
-extern int suspend_enter(suspend_state_t state);
 
 struct timeval;
+/* kernel/power/swsusp.c */
 extern void swsusp_show_speed(struct timeval *, struct timeval *,
                                unsigned int, char *);
+
+#ifdef CONFIG_SUSPEND
+/* kernel/power/main.c */
+extern int suspend_devices_and_enter(suspend_state_t state);
+#else /* !CONFIG_SUSPEND */
+static inline int suspend_devices_and_enter(suspend_state_t state)
+{
+       return -ENOSYS;
+}
+#endif /* !CONFIG_SUSPEND */
+
+/* kernel/power/common.c */
+extern struct blocking_notifier_head pm_chain_head;
+
+static inline int pm_notifier_call_chain(unsigned long val)
+{
+       return (blocking_notifier_call_chain(&pm_chain_head, val, NULL)
+                       == NOTIFY_BAD) ? -EINVAL : 0;
+}