1 /* 2 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org> 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 9 #ifndef __ASM_ARM_EFI_H 10 #define __ASM_ARM_EFI_H 11 12 #include <asm/cacheflush.h> 13 #include <asm/cachetype.h> 14 #include <asm/early_ioremap.h> 15 #include <asm/fixmap.h> 16 #include <asm/highmem.h> 17 #include <asm/mach/map.h> 18 #include <asm/mmu_context.h> 19 #include <asm/pgtable.h> 20 #include <asm/ptrace.h> 21 22 #ifdef CONFIG_EFI 23 void efi_init(void); 24 25 int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md); 26 int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md); 27 28 #define arch_efi_call_virt_setup() efi_virtmap_load() 29 #define arch_efi_call_virt_teardown() efi_virtmap_unload() 30 31 #define arch_efi_call_virt(p, f, args...) \ 32 ({ \ 33 efi_##f##_t *__f; \ 34 __f = p->f; \ 35 __f(args); \ 36 }) 37 38 #define ARCH_EFI_IRQ_FLAGS_MASK \ 39 (PSR_J_BIT | PSR_E_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | \ 40 PSR_T_BIT | MODE_MASK) 41 42 static inline void efi_set_pgd(struct mm_struct *mm) 43 { 44 check_and_switch_context(mm, NULL); 45 } 46 47 void efi_virtmap_load(void); 48 void efi_virtmap_unload(void); 49 50 #else 51 #define efi_init() 52 #endif /* CONFIG_EFI */ 53 54 /* arch specific definitions used by the stub code */ 55 56 #define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__) 57 #define __efi_call_early(f, ...) f(__VA_ARGS__) 58 #define efi_call_runtime(f, ...) sys_table_arg->runtime->f(__VA_ARGS__) 59 #define efi_is_64bit() (false) 60 61 #define efi_call_proto(protocol, f, instance, ...) \ 62 ((protocol##_t *)instance)->f(instance, ##__VA_ARGS__) 63 64 struct screen_info *alloc_screen_info(efi_system_table_t *sys_table_arg); 65 void free_screen_info(efi_system_table_t *sys_table, struct screen_info *si); 66 67 static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt) 68 { 69 } 70 71 /* 72 * A reasonable upper bound for the uncompressed kernel size is 32 MBytes, 73 * so we will reserve that amount of memory. We have no easy way to tell what 74 * the actuall size of code + data the uncompressed kernel will use. 75 * If this is insufficient, the decompressor will relocate itself out of the 76 * way before performing the decompression. 77 */ 78 #define MAX_UNCOMP_KERNEL_SIZE SZ_32M 79 80 /* 81 * The kernel zImage should preferably be located between 32 MB and 128 MB 82 * from the base of DRAM. The min address leaves space for a maximal size 83 * uncompressed image, and the max address is due to how the zImage decompressor 84 * picks a destination address. 85 */ 86 #define ZIMAGE_OFFSET_LIMIT SZ_128M 87 #define MIN_ZIMAGE_OFFSET MAX_UNCOMP_KERNEL_SIZE 88 89 /* on ARM, the FDT should be located in the first 128 MB of RAM */ 90 static inline unsigned long efi_get_max_fdt_addr(unsigned long dram_base) 91 { 92 return dram_base + ZIMAGE_OFFSET_LIMIT; 93 } 94 95 /* on ARM, the initrd should be loaded in a lowmem region */ 96 static inline unsigned long efi_get_max_initrd_addr(unsigned long dram_base, 97 unsigned long image_addr) 98 { 99 return dram_base + SZ_512M; 100 } 101 102 #endif /* _ASM_ARM_EFI_H */ 103