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/pgtable.h> 17 #include <asm/ptrace.h> 18 19 #ifdef CONFIG_EFI 20 void 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_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 #define efi_bs_call(func, ...) efi_system_table()->boottime->func(__VA_ARGS__) 54 #define efi_rt_call(func, ...) efi_system_table()->runtime->func(__VA_ARGS__) 55 #define efi_is_native() (true) 56 57 #define efi_table_attr(inst, attr) (inst->attr) 58 59 #define efi_call_proto(inst, func, ...) inst->func(inst, ##__VA_ARGS__) 60 61 struct screen_info *alloc_screen_info(void); 62 void free_screen_info(struct screen_info *si); 63 64 static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt) 65 { 66 } 67 68 /* 69 * A reasonable upper bound for the uncompressed kernel size is 32 MBytes, 70 * so we will reserve that amount of memory. We have no easy way to tell what 71 * the actuall size of code + data the uncompressed kernel will use. 72 * If this is insufficient, the decompressor will relocate itself out of the 73 * way before performing the decompression. 74 */ 75 #define MAX_UNCOMP_KERNEL_SIZE SZ_32M 76 77 /* 78 * The kernel zImage should preferably be located between 32 MB and 128 MB 79 * from the base of DRAM. The min address leaves space for a maximal size 80 * uncompressed image, and the max address is due to how the zImage decompressor 81 * picks a destination address. 82 */ 83 #define ZIMAGE_OFFSET_LIMIT SZ_128M 84 #define MIN_ZIMAGE_OFFSET MAX_UNCOMP_KERNEL_SIZE 85 86 /* on ARM, the FDT should be located in the first 128 MB of RAM */ 87 static inline unsigned long efi_get_max_fdt_addr(unsigned long dram_base) 88 { 89 return dram_base + ZIMAGE_OFFSET_LIMIT; 90 } 91 92 /* on ARM, the initrd should be loaded in a lowmem region */ 93 static inline unsigned long efi_get_max_initrd_addr(unsigned long dram_base, 94 unsigned long image_addr) 95 { 96 return dram_base + SZ_512M; 97 } 98 99 #endif /* _ASM_ARM_EFI_H */ 100