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#include <asm/ptrace.h>
21
22#ifdef CONFIG_EFI
23void efi_init(void);
24
25int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
26int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
27
28#define arch_efi_call_virt_setup()	efi_virtmap_load()
29#define arch_efi_call_virt_teardown()	efi_virtmap_unload()
30
31#define arch_efi_call_virt(p, f, args...)				\
32({									\
33	efi_##f##_t *__f;						\
34	__f = p->f;							\
35	__f(args);							\
36})
37
38#define ARCH_EFI_IRQ_FLAGS_MASK \
39	(PSR_J_BIT | PSR_E_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | \
40	 PSR_T_BIT | MODE_MASK)
41
42static inline void efi_set_pgd(struct mm_struct *mm)
43{
44	check_and_switch_context(mm, NULL);
45}
46
47void efi_virtmap_load(void);
48void efi_virtmap_unload(void);
49
50#else
51#define efi_init()
52#endif /* CONFIG_EFI */
53
54/* arch specific definitions used by the stub code */
55
56#define efi_call_early(f, ...)		sys_table_arg->boottime->f(__VA_ARGS__)
57#define __efi_call_early(f, ...)	f(__VA_ARGS__)
58#define efi_is_64bit()			(false)
59
60#define efi_call_proto(protocol, f, instance, ...)			\
61	((protocol##_t *)instance)->f(instance, ##__VA_ARGS__)
62
63struct screen_info *alloc_screen_info(efi_system_table_t *sys_table_arg);
64void free_screen_info(efi_system_table_t *sys_table, struct screen_info *si);
65
66static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
67{
68}
69
70/*
71 * A reasonable upper bound for the uncompressed kernel size is 32 MBytes,
72 * so we will reserve that amount of memory. We have no easy way to tell what
73 * the actuall size of code + data the uncompressed kernel will use.
74 * If this is insufficient, the decompressor will relocate itself out of the
75 * way before performing the decompression.
76 */
77#define MAX_UNCOMP_KERNEL_SIZE	SZ_32M
78
79/*
80 * The kernel zImage should preferably be located between 32 MB and 128 MB
81 * from the base of DRAM. The min address leaves space for a maximal size
82 * uncompressed image, and the max address is due to how the zImage decompressor
83 * picks a destination address.
84 */
85#define ZIMAGE_OFFSET_LIMIT	SZ_128M
86#define MIN_ZIMAGE_OFFSET	MAX_UNCOMP_KERNEL_SIZE
87#define MAX_FDT_OFFSET		ZIMAGE_OFFSET_LIMIT
88
89#endif /* _ASM_ARM_EFI_H */