1 files changed, 38 insertions, 0 deletions

diff --git a/arch/arm/kernel/efi.c b/arch/arm/kernel/efi.c
new file mode 100644
index 000000000000..ff8a9d8acfac
--- /dev/null
+++ b/arch/arm/kernel/efi.c
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/efi.h>
+#include <asm/efi.h>
+#include <asm/mach/map.h>
+#include <asm/mmu_context.h>
+
+int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
+{
+        struct map_desc desc = {
+                .virtual        = md->virt_addr,
+                .pfn            = __phys_to_pfn(md->phys_addr),
+                .length         = md->num_pages * EFI_PAGE_SIZE,
+        };
+
+        /*
+         * Order is important here: memory regions may have all of the
+         * bits below set (and usually do), so we check them in order of
+         * preference.
+         */
+        if (md->attribute & EFI_MEMORY_WB)
+                desc.type = MT_MEMORY_RWX;
+        else if (md->attribute & EFI_MEMORY_WT)
+                desc.type = MT_MEMORY_RWX_NONCACHED;
+        else if (md->attribute & EFI_MEMORY_WC)
+                desc.type = MT_DEVICE_WC;
+        else
+                desc.type = MT_DEVICE;
+
+        create_mapping_late(mm, &desc, true);
+        return 0;
+}