1/*
 2 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
 3 *
 4 * This program is free software; you can redistribute it and/or modify
 5 * it under the terms of the GNU General Public License version 2 as
 6 * published by the Free Software Foundation.
 7 */
 8
 9#include <linux/efi.h>
10#include <asm/efi.h>
11#include <asm/mach/map.h>
12#include <asm/mmu_context.h>
13
14int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
15{
16	struct map_desc desc = {
17		.virtual	= md->virt_addr,
18		.pfn		= __phys_to_pfn(md->phys_addr),
19		.length		= md->num_pages * EFI_PAGE_SIZE,
20	};
21
22	/*
23	 * Order is important here: memory regions may have all of the
24	 * bits below set (and usually do), so we check them in order of
25	 * preference.
26	 */
27	if (md->attribute & EFI_MEMORY_WB)
28		desc.type = MT_MEMORY_RWX;
29	else if (md->attribute & EFI_MEMORY_WT)
30		desc.type = MT_MEMORY_RWX_NONCACHED;
31	else if (md->attribute & EFI_MEMORY_WC)
32		desc.type = MT_DEVICE_WC;
33	else
34		desc.type = MT_DEVICE;
35
36	create_mapping_late(mm, &desc, true);
37	return 0;
38}