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-rw-r--r--arch/x86_64/kernel/suspend.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/suspend.c b/arch/x86_64/kernel/suspend.c
index fe865ea4df52..4ca523d58a5b 100644
--- a/arch/x86_64/kernel/suspend.c
+++ b/arch/x86_64/kernel/suspend.c
@@ -13,6 +13,9 @@
#include <asm/page.h>
#include <asm/pgtable.h>
+/* References to section boundaries */
+extern const void __nosave_begin, __nosave_end;
+
struct saved_context saved_context;
unsigned long saved_context_eax, saved_context_ebx, saved_context_ecx, saved_context_edx;
@@ -220,4 +223,15 @@ int swsusp_arch_resume(void)
restore_image();
return 0;
}
+
+/*
+ * pfn_is_nosave - check if given pfn is in the 'nosave' section
+ */
+
+int pfn_is_nosave(unsigned long pfn)
+{
+ unsigned long nosave_begin_pfn = __pa_symbol(&__nosave_begin) >> PAGE_SHIFT;
+ unsigned long nosave_end_pfn = PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT;
+ return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
+}
#endif /* CONFIG_SOFTWARE_SUSPEND */