Hibernation: Arbitrary boot kernel support - generic code

[deliverable/linux.git] / kernel / power / power.h

diff --git a/kernel/power/power.h b/kernel/power/power.h
index 95fbf2dd3fe33901be99ef8ce60a3bf2ca9fb833..a0204dfc6c4cf054f4d11074c5266e9ebf35bc31 100644 (file)
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -11,14 +11,32 @@ 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_HIBERNATION
 /*
  * 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.