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_call_virt(p, f, args...) \ 28 ({ \ 29 efi_##f##_t *__f; \ 30 __f = p->f; \ 31 __f(args); \ 32 }) 33 34 #define ARCH_EFI_IRQ_FLAGS_MASK \ 35 (PSR_J_BIT | PSR_E_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | \ 36 PSR_T_BIT | MODE_MASK) 37 38 static inline void efi_set_pgd(struct mm_struct *mm) 39 { 40 check_and_switch_context(mm, NULL); 41 } 42 43 void efi_virtmap_load(void); 44 void efi_virtmap_unload(void); 45 46 #else 47 #define efi_init() 48 #endif /* CONFIG_EFI */ 49 50 /* arch specific definitions used by the stub code */ 51 52 struct screen_info *alloc_screen_info(void); 53 void free_screen_info(struct screen_info *si); 54 55 static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt) 56 { 57 } 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 * The kernel zImage should preferably be located between 32 MB and 128 MB 70 * from the base of DRAM. The min address leaves space for a maximal size 71 * uncompressed image, and the max address is due to how the zImage decompressor 72 * picks a destination address. 73 */ 74 #define ZIMAGE_OFFSET_LIMIT SZ_128M 75 #define MIN_ZIMAGE_OFFSET MAX_UNCOMP_KERNEL_SIZE 76 77 /* on ARM, the FDT should be located in the first 128 MB of RAM */ 78 static inline unsigned long efi_get_max_fdt_addr(unsigned long dram_base) 79 { 80 return dram_base + ZIMAGE_OFFSET_LIMIT; 81 } 82 83 /* on ARM, the initrd should be loaded in a lowmem region */ 84 static inline unsigned long efi_get_max_initrd_addr(unsigned long dram_base, 85 unsigned long image_addr) 86 { 87 return dram_base + SZ_512M; 88 } 89 90 #endif /* _ASM_ARM_EFI_H */ 91