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#ifndef __ASM_ARM_EFI_H
10#define __ASM_ARM_EFI_H
11
12#include <asm/cacheflush.h>
13#include <asm/cachetype.h>
14#include <asm/early_ioremap.h>
15#include <asm/fixmap.h>
16#include <asm/highmem.h>
17#include <asm/mach/map.h>
18#include <asm/mmu_context.h>
19#include <asm/pgtable.h>
20
21#ifdef CONFIG_EFI
22void efi_init(void);
23
24int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
25
26#define efi_call_virt(f, ...)						\
27({									\
28	efi_##f##_t *__f;						\
29	efi_status_t __s;						\
30									\
31	efi_virtmap_load();						\
32	__f = efi.systab->runtime->f;					\
33	__s = __f(__VA_ARGS__);						\
34	efi_virtmap_unload();						\
35	__s;								\
36})
37
38#define __efi_call_virt(f, ...)						\
39({									\
40	efi_##f##_t *__f;						\
41									\
42	efi_virtmap_load();						\
43	__f = efi.systab->runtime->f;					\
44	__f(__VA_ARGS__);						\
45	efi_virtmap_unload();						\
46})
47
48static inline void efi_set_pgd(struct mm_struct *mm)
49{
50	check_and_switch_context(mm, NULL);
51}
52
53void efi_virtmap_load(void);
54void efi_virtmap_unload(void);
55
56#else
57#define efi_init()
58#endif /* CONFIG_EFI */
59
60/* arch specific definitions used by the stub code */
61
62#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
63
64/*
65 * A reasonable upper bound for the uncompressed kernel size is 32 MBytes,
66 * so we will reserve that amount of memory. We have no easy way to tell what
67 * the actuall size of code + data the uncompressed kernel will use.
68 * If this is insufficient, the decompressor will relocate itself out of the
69 * way before performing the decompression.
70 */
71#define MAX_UNCOMP_KERNEL_SIZE	SZ_32M
72
73/*
74 * The kernel zImage should preferably be located between 32 MB and 128 MB
75 * from the base of DRAM. The min address leaves space for a maximal size
76 * uncompressed image, and the max address is due to how the zImage decompressor
77 * picks a destination address.
78 */
79#define ZIMAGE_OFFSET_LIMIT	SZ_128M
80#define MIN_ZIMAGE_OFFSET	MAX_UNCOMP_KERNEL_SIZE
81#define MAX_FDT_OFFSET		ZIMAGE_OFFSET_LIMIT
82
83#endif /* _ASM_ARM_EFI_H */