Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm

[pandora-kernel.git] / arch / i386 / kernel / e820.c

diff --git a/arch/i386/kernel/e820.c b/arch/i386/kernel/e820.c
index fc822a4..e60cddb 100644 (file)
--- a/arch/i386/kernel/e820.c
+++ b/arch/i386/kernel/e820.c
@@ -10,6 +10,7 @@
 #include <linux/efi.h>
 #include <linux/pfn.h>
 #include <linux/uaccess.h>
+#include <linux/suspend.h>
 
 #include <asm/pgtable.h>
 #include <asm/page.h>
@@ -320,6 +321,37 @@ static int __init request_standard_resources(void)
 
 subsys_initcall(request_standard_resources);
 
+#if defined(CONFIG_PM) && defined(CONFIG_SOFTWARE_SUSPEND)
+/**
+ * e820_mark_nosave_regions - Find the ranges of physical addresses that do not
+ * correspond to e820 RAM areas and mark the corresponding pages as nosave for
+ * hibernation.
+ *
+ * This function requires the e820 map to be sorted and without any
+ * overlapping entries and assumes the first e820 area to be RAM.
+ */
+void __init e820_mark_nosave_regions(void)
+{
+       int i;
+       unsigned long pfn;
+
+       pfn = PFN_DOWN(e820.map[0].addr + e820.map[0].size);
+       for (i = 1; i < e820.nr_map; i++) {
+               struct e820entry *ei = &e820.map[i];
+
+               if (pfn < PFN_UP(ei->addr))
+                       register_nosave_region(pfn, PFN_UP(ei->addr));
+
+               pfn = PFN_DOWN(ei->addr + ei->size);
+               if (ei->type != E820_RAM)
+                       register_nosave_region(PFN_UP(ei->addr), pfn);
+
+               if (pfn >= max_low_pfn)
+                       break;
+       }
+}
+#endif
+
 void __init add_memory_region(unsigned long long start,
                              unsigned long long size, int type)
 {