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 21 #ifdef CONFIG_EFI 22 void efi_init(void); 23 24 int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md); 25 26 #define efi_call_virt(f, ...) \ 27 ({ \ 28 efi_##f##_t *__f; \ 29 efi_status_t __s; \ 30 \ 31 efi_virtmap_load(); \ 32 __f = efi.systab->runtime->f; \ 33 __s = __f(__VA_ARGS__); \ 34 efi_virtmap_unload(); \ 35 __s; \ 36 }) 37 38 #define __efi_call_virt(f, ...) \ 39 ({ \ 40 efi_##f##_t *__f; \ 41 \ 42 efi_virtmap_load(); \ 43 __f = efi.systab->runtime->f; \ 44 __f(__VA_ARGS__); \ 45 efi_virtmap_unload(); \ 46 }) 47 48 static inline void efi_set_pgd(struct mm_struct *mm) 49 { 50 check_and_switch_context(mm, NULL); 51 } 52 53 void efi_virtmap_load(void); 54 void efi_virtmap_unload(void); 55 56 #else 57 #define efi_init() 58 #endif /* CONFIG_EFI */ 59 60 /* arch specific definitions used by the stub code */ 61 62 #define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__) 63 64 /* 65 * A reasonable upper bound for the uncompressed kernel size is 32 MBytes, 66 * so we will reserve that amount of memory. We have no easy way to tell what 67 * the actuall size of code + data the uncompressed kernel will use. 68 * If this is insufficient, the decompressor will relocate itself out of the 69 * way before performing the decompression. 70 */ 71 #define MAX_UNCOMP_KERNEL_SIZE SZ_32M 72 73 /* 74 * The kernel zImage should preferably be located between 32 MB and 128 MB 75 * from the base of DRAM. The min address leaves space for a maximal size 76 * uncompressed image, and the max address is due to how the zImage decompressor 77 * picks a destination address. 78 */ 79 #define ZIMAGE_OFFSET_LIMIT SZ_128M 80 #define MIN_ZIMAGE_OFFSET MAX_UNCOMP_KERNEL_SIZE 81 #define MAX_FDT_OFFSET ZIMAGE_OFFSET_LIMIT 82 83 #endif /* _ASM_ARM_EFI_H */ 84