1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
4 */
5
6 #ifndef __ASM_ARM_EFI_H
7 #define __ASM_ARM_EFI_H
8
9 #include <asm/cacheflush.h>
10 #include <asm/cachetype.h>
11 #include <asm/early_ioremap.h>
12 #include <asm/fixmap.h>
13 #include <asm/highmem.h>
14 #include <asm/mach/map.h>
15 #include <asm/mmu_context.h>
16 #include <asm/ptrace.h>
17
18 #ifdef CONFIG_EFI
19 void efi_init(void);
20 extern void efifb_setup_from_dmi(struct screen_info *si, const char *opt);
21
22 int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
23 int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
24
25 #define arch_efi_call_virt_setup() efi_virtmap_load()
26 #define arch_efi_call_virt_teardown() efi_virtmap_unload()
27
28 #define arch_efi_call_virt(p, f, args...) \
29 ({ \
30 efi_##f##_t *__f; \
31 __f = p->f; \
32 __f(args); \
33 })
34
35 #define ARCH_EFI_IRQ_FLAGS_MASK \
36 (PSR_J_BIT | PSR_E_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | \
37 PSR_T_BIT | MODE_MASK)
38
efi_set_pgd(struct mm_struct * mm)39 static inline void efi_set_pgd(struct mm_struct *mm)
40 {
41 check_and_switch_context(mm, NULL);
42 }
43
44 void efi_virtmap_load(void);
45 void efi_virtmap_unload(void);
46
47 #else
48 #define efi_init()
49 #endif /* CONFIG_EFI */
50
51 /* arch specific definitions used by the stub code */
52
53 struct screen_info *alloc_screen_info(void);
54 void free_screen_info(struct screen_info *si);
55
56 /*
57 * A reasonable upper bound for the uncompressed kernel size is 32 MBytes,
58 * so we will reserve that amount of memory. We have no easy way to tell what
59 * the actuall size of code + data the uncompressed kernel will use.
60 * If this is insufficient, the decompressor will relocate itself out of the
61 * way before performing the decompression.
62 */
63 #define MAX_UNCOMP_KERNEL_SIZE SZ_32M
64
65 /*
66 * phys-to-virt patching requires that the physical to virtual offset is a
67 * multiple of 2 MiB. However, using an alignment smaller than TEXT_OFFSET
68 * here throws off the memory allocation logic, so let's use the lowest power
69 * of two greater than 2 MiB and greater than TEXT_OFFSET.
70 */
71 #define EFI_PHYS_ALIGN max(UL(SZ_2M), roundup_pow_of_two(TEXT_OFFSET))
72
73 /* on ARM, the initrd should be loaded in a lowmem region */
efi_get_max_initrd_addr(unsigned long image_addr)74 static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr)
75 {
76 return round_down(image_addr, SZ_4M) + SZ_512M;
77 }
78
79 struct efi_arm_entry_state {
80 u32 cpsr_before_ebs;
81 u32 sctlr_before_ebs;
82 u32 cpsr_after_ebs;
83 u32 sctlr_after_ebs;
84 };
85
efi_capsule_flush_cache_range(void * addr,int size)86 static inline void efi_capsule_flush_cache_range(void *addr, int size)
87 {
88 __cpuc_flush_dcache_area(addr, size);
89 }
90
91 #endif /* _ASM_ARM_EFI_H */
92
