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 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 */ 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 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