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| 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 | #include <asm/uaccess.h> |
| 18 | |
| 19 | #ifdef CONFIG_EFI |
| 20 | void efi_init(void); |
| 21 | void arm_efi_init(void); |
| 22 | |
| 23 | int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md); |
| 24 | int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md, bool); |
| 25 | |
| 26 | #define arch_efi_call_virt_setup() efi_virtmap_load() |
| 27 | #define arch_efi_call_virt_teardown() efi_virtmap_unload() |
| 28 | |
| 29 | #ifdef CONFIG_CPU_TTBR0_PAN |
| 30 | #undef arch_efi_call_virt |
| 31 | #define arch_efi_call_virt(p, f, args...) ({ \ |
| 32 | unsigned int flags = uaccess_save_and_enable(); \ |
| 33 | efi_status_t res = _Generic((p)->f(args), \ |
| 34 | efi_status_t: (p)->f(args), \ |
| 35 | default: ((p)->f(args), EFI_ABORTED)); \ |
| 36 | uaccess_restore(flags); \ |
| 37 | res; \ |
| 38 | }) |
| 39 | #endif |
| 40 | |
| 41 | #define ARCH_EFI_IRQ_FLAGS_MASK \ |
| 42 | (PSR_J_BIT | PSR_E_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | \ |
| 43 | PSR_T_BIT | MODE_MASK) |
| 44 | |
| 45 | static inline void efi_set_pgd(struct mm_struct *mm) |
| 46 | { |
| 47 | check_and_switch_context(mm, NULL); |
| 48 | } |
| 49 | |
| 50 | void efi_virtmap_load(void); |
| 51 | void efi_virtmap_unload(void); |
| 52 | |
| 53 | #else |
| 54 | #define arm_efi_init() |
| 55 | #endif /* CONFIG_EFI */ |
| 56 | |
| 57 | /* arch specific definitions used by the stub code */ |
| 58 | |
| 59 | /* |
| 60 | * A reasonable upper bound for the uncompressed kernel size is 32 MBytes, |
| 61 | * so we will reserve that amount of memory. We have no easy way to tell what |
| 62 | * the actuall size of code + data the uncompressed kernel will use. |
| 63 | * If this is insufficient, the decompressor will relocate itself out of the |
| 64 | * way before performing the decompression. |
| 65 | */ |
| 66 | #define MAX_UNCOMP_KERNEL_SIZE SZ_32M |
| 67 | |
| 68 | /* |
| 69 | * phys-to-virt patching requires that the physical to virtual offset is a |
| 70 | * multiple of 2 MiB. However, using an alignment smaller than TEXT_OFFSET |
| 71 | * here throws off the memory allocation logic, so let's use the lowest power |
| 72 | * of two greater than 2 MiB and greater than TEXT_OFFSET. |
| 73 | */ |
| 74 | #define EFI_PHYS_ALIGN max(UL(SZ_2M), roundup_pow_of_two(TEXT_OFFSET)) |
| 75 | |
| 76 | /* on ARM, the initrd should be loaded in a lowmem region */ |
| 77 | static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr) |
| 78 | { |
| 79 | return round_down(image_addr, SZ_4M) + SZ_512M; |
| 80 | } |
| 81 | |
| 82 | struct efi_arm_entry_state { |
| 83 | u32 cpsr_before_ebs; |
| 84 | u32 sctlr_before_ebs; |
| 85 | u32 cpsr_after_ebs; |
| 86 | u32 sctlr_after_ebs; |
| 87 | }; |
| 88 | |
| 89 | static inline void efi_capsule_flush_cache_range(void *addr, int size) |
| 90 | { |
| 91 | __cpuc_flush_dcache_area(addr, size); |
| 92 | } |
| 93 | |
| 94 | #endif /* _ASM_ARM_EFI_H */ |
| 95 |
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