summaryrefslogtreecommitdiffstats
path: root/kernel/power/power.h
diff options
context:
space:
mode:
authorRafael J. Wysocki <rjw@sisk.pl>2007-10-18 03:04:52 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-18 14:37:19 -0700
commitd307c4a8e826c44f9633bd3f7e60d0491e7d885a (patch)
tree1e381840363594557c5e31b1bcdc3f491d474039 /kernel/power/power.h
parent50a1efe14fd56a273cdbe53bf1c7fc12099d2e1a (diff)
downloadlinux-d307c4a8e826c44f9633bd3f7e60d0491e7d885a.tar.bz2
Hibernation: Arbitrary boot kernel support - generic code
Add the bits needed for supporting arbitrary boot kernels to the common hibernation code. To support arbitrary boot kernels, make it possible to replace the 'struct new_utsname' and the kernel version in the hibernation image header by some architecture specific data that will be used to verify if the image is valid and to restore the image. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/power/power.h')
-rw-r--r--kernel/power/power.h20
1 files changed, 19 insertions, 1 deletions
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 95fbf2dd3fe3..a0204dfc6c4c 100644
--- 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.