1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef _DRIVERS_FIRMWARE_EFI_EFISTUB_H 4 #define _DRIVERS_FIRMWARE_EFI_EFISTUB_H 5 6 /* error code which can't be mistaken for valid address */ 7 #define EFI_ERROR (~0UL) 8 9 /* 10 * __init annotations should not be used in the EFI stub, since the code is 11 * either included in the decompressor (x86, ARM) where they have no effect, 12 * or the whole stub is __init annotated at the section level (arm64), by 13 * renaming the sections, in which case the __init annotation will be 14 * redundant, and will result in section names like .init.init.text, and our 15 * linker script does not expect that. 16 */ 17 #undef __init 18 19 /* 20 * Allow the platform to override the allocation granularity: this allows 21 * systems that have the capability to run with a larger page size to deal 22 * with the allocations for initrd and fdt more efficiently. 23 */ 24 #ifndef EFI_ALLOC_ALIGN 25 #define EFI_ALLOC_ALIGN EFI_PAGE_SIZE 26 #endif 27 28 #ifdef CONFIG_ARM 29 #define __efistub_global __section(.data) 30 #else 31 #define __efistub_global 32 #endif 33 34 extern bool __pure nokaslr(void); 35 extern bool __pure is_quiet(void); 36 extern bool __pure novamap(void); 37 38 extern __pure efi_system_table_t *efi_system_table(void); 39 40 #define pr_efi(msg) do { \ 41 if (!is_quiet()) efi_printk("EFI stub: "msg); \ 42 } while (0) 43 44 #define pr_efi_err(msg) efi_printk("EFI stub: ERROR: "msg) 45 46 void efi_char16_printk(efi_char16_t *); 47 void efi_char16_printk(efi_char16_t *); 48 49 unsigned long get_dram_base(void); 50 51 efi_status_t allocate_new_fdt_and_exit_boot(void *handle, 52 unsigned long *new_fdt_addr, 53 unsigned long max_addr, 54 u64 initrd_addr, u64 initrd_size, 55 char *cmdline_ptr, 56 unsigned long fdt_addr, 57 unsigned long fdt_size); 58 59 void *get_fdt(unsigned long *fdt_size); 60 61 void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size, 62 unsigned long desc_size, efi_memory_desc_t *runtime_map, 63 int *count); 64 65 efi_status_t efi_get_random_bytes(unsigned long size, u8 *out); 66 67 efi_status_t efi_random_alloc(unsigned long size, unsigned long align, 68 unsigned long *addr, unsigned long random_seed); 69 70 efi_status_t check_platform_features(void); 71 72 void *get_efi_config_table(efi_guid_t guid); 73 74 /* Helper macros for the usual case of using simple C variables: */ 75 #ifndef fdt_setprop_inplace_var 76 #define fdt_setprop_inplace_var(fdt, node_offset, name, var) \ 77 fdt_setprop_inplace((fdt), (node_offset), (name), &(var), sizeof(var)) 78 #endif 79 80 #ifndef fdt_setprop_var 81 #define fdt_setprop_var(fdt, node_offset, name, var) \ 82 fdt_setprop((fdt), (node_offset), (name), &(var), sizeof(var)) 83 #endif 84 85 #define get_efi_var(name, vendor, ...) \ 86 efi_rt_call(get_variable, (efi_char16_t *)(name), \ 87 (efi_guid_t *)(vendor), __VA_ARGS__) 88 89 #define set_efi_var(name, vendor, ...) \ 90 efi_rt_call(set_variable, (efi_char16_t *)(name), \ 91 (efi_guid_t *)(vendor), __VA_ARGS__) 92 93 #endif 94