tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 */