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
23 void efi_init(void);
24
25 int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
26 int 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
efi_set_pgd(struct mm_struct * mm)42 static inline void efi_set_pgd(struct mm_struct *mm)
43 {
44 check_and_switch_context(mm, NULL);
45 }
46
47 void efi_virtmap_load(void);
48 void 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_call_runtime(f, ...) sys_table_arg->runtime->f(__VA_ARGS__)
59 #define efi_is_64bit() (false)
60
61 #define efi_table_attr(table, attr, instance) \
62 ((table##_t *)instance)->attr
63
64 #define efi_call_proto(protocol, f, instance, ...) \
65 ((protocol##_t *)instance)->f(instance, ##__VA_ARGS__)
66
67 struct screen_info *alloc_screen_info(efi_system_table_t *sys_table_arg);
68 void free_screen_info(efi_system_table_t *sys_table, struct screen_info *si);
69
efifb_setup_from_dmi(struct screen_info * si,const char * opt)70 static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
71 {
72 }
73
74 /*
75 * A reasonable upper bound for the uncompressed kernel size is 32 MBytes,
76 * so we will reserve that amount of memory. We have no easy way to tell what
77 * the actuall size of code + data the uncompressed kernel will use.
78 * If this is insufficient, the decompressor will relocate itself out of the
79 * way before performing the decompression.
80 */
81 #define MAX_UNCOMP_KERNEL_SIZE SZ_32M
82
83 /*
84 * The kernel zImage should preferably be located between 32 MB and 128 MB
85 * from the base of DRAM. The min address leaves space for a maximal size
86 * uncompressed image, and the max address is due to how the zImage decompressor
87 * picks a destination address.
88 */
89 #define ZIMAGE_OFFSET_LIMIT SZ_128M
90 #define MIN_ZIMAGE_OFFSET MAX_UNCOMP_KERNEL_SIZE
91
92 /* on ARM, the FDT should be located in the first 128 MB of RAM */
efi_get_max_fdt_addr(unsigned long dram_base)93 static inline unsigned long efi_get_max_fdt_addr(unsigned long dram_base)
94 {
95 return dram_base + ZIMAGE_OFFSET_LIMIT;
96 }
97
98 /* on ARM, the initrd should be loaded in a lowmem region */
efi_get_max_initrd_addr(unsigned long dram_base,unsigned long image_addr)99 static inline unsigned long efi_get_max_initrd_addr(unsigned long dram_base,
100 unsigned long image_addr)
101 {
102 return dram_base + SZ_512M;
103 }
104
105 #endif /* _ASM_ARM_EFI_H */
106
