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