1 files changed, 32 insertions, 0 deletions

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 544dd12c70f4..432c49178577 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -998,3 +998,35 @@ void __init finish_e820_parsing(void)
                 e820_print_map("user");
         }
 }
+
+/*
+ * Mark e820 reserved areas as busy for the resource manager.
+ */
+void __init e820_reserve_resources(void)
+{
+        int i;
+        struct resource *res;
+
+        res = alloc_bootmem_low(sizeof(struct resource) * e820.nr_map);
+        for (i = 0; i < e820.nr_map; i++) {
+                switch (e820.map[i].type) {
+                case E820_RAM:  res->name = "System RAM"; break;
+                case E820_ACPI: res->name = "ACPI Tables"; break;
+                case E820_NVS:  res->name = "ACPI Non-volatile Storage"; break;
+                default:        res->name = "reserved";
+                }
+                res->start = e820.map[i].addr;
+                res->end = res->start + e820.map[i].size - 1;
+#ifndef CONFIG_RESOURCES_64BIT
+                if (res->end > 0x100000000ULL) {
+                        res++;
+                        continue;
+                }
+#endif
+                res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+                insert_resource(&iomem_resource, res);
+                res++;
+        }
+}
+
+