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authorRafael J. Wysocki <rjw@sisk.pl>2008-01-30 13:30:04 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:30:04 +0100
commit5c9c9bec0589be696c70c5efb448b17d5ab720e2 (patch)
treeb4fe757645a01c76ed297792f03a4ba10743bd55 /include/asm-x86/suspend_64.h
parent9484b1eb4d05957d3114dc63026448eb66106c06 (diff)
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x86: hibernation: document __save_processor_state() on x86
Document the fact that __save_processor_state() has to save all CPU registers referred to by the kernel in case a different kernel is used to load and restore a hibernation image containing it. Sigend-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/asm-x86/suspend_64.h')
-rw-r--r--include/asm-x86/suspend_64.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/include/asm-x86/suspend_64.h b/include/asm-x86/suspend_64.h
index c505a76..4404668 100644
--- a/include/asm-x86/suspend_64.h
+++ b/include/asm-x86/suspend_64.h
@@ -15,7 +15,14 @@ arch_prepare_suspend(void)
return 0;
}
-/* Image of the saved processor state. If you touch this, fix acpi/wakeup.S. */
+/*
+ * Image of the saved processor state, used by the low level ACPI suspend to
+ * RAM code and by the low level hibernation code.
+ *
+ * If you modify it, fix arch/x86/kernel/acpi/wakeup_64.S and make sure that
+ * __save/__restore_processor_state(), defined in arch/x86/kernel/suspend_64.c,
+ * still work as required.
+ */
struct saved_context {
struct pt_regs regs;
u16 ds, es, fs, gs, ss;