1 files changed, 20 insertions, 0 deletions

diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 1a201ac7cef8..b97acecf3fd9 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -52,6 +52,7 @@
 #include <asm/tlbflush.h>
 #include <asm/x86_init.h>
 #include <asm/rtc.h>
+#include <asm/uv/uv.h>
 
 #define EFI_DEBUG
 
@@ -1210,3 +1211,22 @@ static int __init parse_efi_cmdline(char *str)
         return 0;
 }
 early_param("efi", parse_efi_cmdline);
+
+void __init efi_apply_memmap_quirks(void)
+{
+        /*
+         * Once setup is done earlier, unmap the EFI memory map on mismatched
+         * firmware/kernel architectures since there is no support for runtime
+         * services.
+         */
+        if (!efi_is_native()) {
+                pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n");
+                efi_unmap_memmap();
+        }
+
+        /*
+         * UV doesn't support the new EFI pagetable mapping yet.
+         */
+        if (is_uv_system())
+                set_bit(EFI_OLD_MEMMAP, &x86_efi_facility);
+}