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 void arm_efi_init(void);
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_IRQ_FLAGS_MASK \
29 (PSR_J_BIT | PSR_E_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | \
30 PSR_T_BIT | MODE_MASK)
31
efi_set_pgd(struct mm_struct * mm)32 static inline void efi_set_pgd(struct mm_struct *mm)
33 {
34 check_and_switch_context(mm, NULL);
35 }
36
37 void efi_virtmap_load(void);
38 void efi_virtmap_unload(void);
39
40 #else
41 #define arm_efi_init()
42 #endif /* CONFIG_EFI */
43
44 /* arch specific definitions used by the stub code */
45
46 struct screen_info *alloc_screen_info(void);
47 void free_screen_info(struct screen_info *si);
48
49 /*
50 * A reasonable upper bound for the uncompressed kernel size is 32 MBytes,
51 * so we will reserve that amount of memory. We have no easy way to tell what
52 * the actuall size of code + data the uncompressed kernel will use.
53 * If this is insufficient, the decompressor will relocate itself out of the
54 * way before performing the decompression.
55 */
56 #define MAX_UNCOMP_KERNEL_SIZE SZ_32M
57
58 /*
59 * phys-to-virt patching requires that the physical to virtual offset is a
60 * multiple of 2 MiB. However, using an alignment smaller than TEXT_OFFSET
61 * here throws off the memory allocation logic, so let's use the lowest power
62 * of two greater than 2 MiB and greater than TEXT_OFFSET.
63 */
64 #define EFI_PHYS_ALIGN max(UL(SZ_2M), roundup_pow_of_two(TEXT_OFFSET))
65
66 /* on ARM, the initrd should be loaded in a lowmem region */
efi_get_max_initrd_addr(unsigned long image_addr)67 static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr)
68 {
69 return round_down(image_addr, SZ_4M) + SZ_512M;
70 }
71
72 struct efi_arm_entry_state {
73 u32 cpsr_before_ebs;
74 u32 sctlr_before_ebs;
75 u32 cpsr_after_ebs;
76 u32 sctlr_after_ebs;
77 };
78
efi_capsule_flush_cache_range(void * addr,int size)79 static inline void efi_capsule_flush_cache_range(void *addr, int size)
80 {
81 __cpuc_flush_dcache_area(addr, size);
82 }
83
84 #endif /* _ASM_ARM_EFI_H */
85