1 files changed, 26 insertions, 0 deletions

diff --git a/arch/x86/kernel/efi.c b/arch/x86/kernel/efi.c
index 77d424cf68b3..4a1a26d5931f 100644
--- a/arch/x86/kernel/efi.c
+++ b/arch/x86/kernel/efi.c
@@ -213,6 +213,31 @@ unsigned long efi_get_time(void)
                       eft.minute, eft.second);
 }
 
+/*
+ * Tell the kernel about the EFI memory map.  This might include
+ * more than the max 128 entries that can fit in the e820 legacy
+ * (zeropage) memory map.
+ */
+
+static void __init add_efi_memmap(void)
+{
+        void *p;
+
+        for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
+                efi_memory_desc_t *md = p;
+                unsigned long long start = md->phys_addr;
+                unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
+                int e820_type;
+
+                if (md->attribute & EFI_MEMORY_WB)
+                        e820_type = E820_RAM;
+                else
+                        e820_type = E820_RESERVED;
+                add_memory_region(start, size, e820_type);
+        }
+        sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
+}
+
 #if EFI_DEBUG
 static void __init print_efi_memmap(void)
 {
@@ -370,6 +395,7 @@ void __init efi_init(void)
         if (memmap.desc_size != sizeof(efi_memory_desc_t))
                 printk(KERN_WARNING "Kernel-defined memdesc"
                        "doesn't match the one from EFI!\n");
+        add_efi_memmap();
 
         /* Setup for EFI runtime service */
         reboot_type = BOOT_EFI;