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 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 */ 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 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