1 /* 2 * EFI application loader 3 * 4 * Copyright (c) 2016 Alexander Graf 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.h> 10 #include <command.h> 11 #include <efi_loader.h> 12 #include <errno.h> 13 #include <libfdt.h> 14 #include <libfdt_env.h> 15 #include <malloc.h> 16 #include <asm/global_data.h> 17 18 DECLARE_GLOBAL_DATA_PTR; 19 20 /* 21 * When booting using the "bootefi" command, we don't know which 22 * physical device the file came from. So we create a pseudo-device 23 * called "bootefi" with the device path /bootefi. 24 * 25 * In addition to the originating device we also declare the file path 26 * of "bootefi" based loads to be /bootefi. 27 */ 28 static struct efi_device_path_file_path bootefi_image_path[] = { 29 { 30 .dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE, 31 .dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH, 32 .dp.length = sizeof(bootefi_image_path[0]), 33 .str = { 'b','o','o','t','e','f','i' }, 34 }, { 35 .dp.type = DEVICE_PATH_TYPE_END, 36 .dp.sub_type = DEVICE_PATH_SUB_TYPE_END, 37 .dp.length = sizeof(bootefi_image_path[0]), 38 } 39 }; 40 41 static struct efi_device_path_file_path bootefi_device_path[] = { 42 { 43 .dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE, 44 .dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH, 45 .dp.length = sizeof(bootefi_image_path[0]), 46 .str = { 'b','o','o','t','e','f','i' }, 47 }, { 48 .dp.type = DEVICE_PATH_TYPE_END, 49 .dp.sub_type = DEVICE_PATH_SUB_TYPE_END, 50 .dp.length = sizeof(bootefi_image_path[0]), 51 } 52 }; 53 54 static efi_status_t bootefi_open_dp(void *handle, efi_guid_t *protocol, 55 void **protocol_interface, void *agent_handle, 56 void *controller_handle, uint32_t attributes) 57 { 58 *protocol_interface = bootefi_device_path; 59 return EFI_SUCCESS; 60 } 61 62 /* The EFI loaded_image interface for the image executed via "bootefi" */ 63 static struct efi_loaded_image loaded_image_info = { 64 .device_handle = bootefi_device_path, 65 .file_path = bootefi_image_path, 66 }; 67 68 /* The EFI object struct for the image executed via "bootefi" */ 69 static struct efi_object loaded_image_info_obj = { 70 .handle = &loaded_image_info, 71 .protocols = { 72 { 73 /* 74 * When asking for the loaded_image interface, just 75 * return handle which points to loaded_image_info 76 */ 77 .guid = &efi_guid_loaded_image, 78 .open = &efi_return_handle, 79 }, 80 { 81 /* 82 * When asking for the device path interface, return 83 * bootefi_device_path 84 */ 85 .guid = &efi_guid_device_path, 86 .open = &bootefi_open_dp, 87 }, 88 }, 89 }; 90 91 /* The EFI object struct for the device the "bootefi" image was loaded from */ 92 static struct efi_object bootefi_device_obj = { 93 .handle = bootefi_device_path, 94 .protocols = { 95 { 96 /* When asking for the device path interface, return 97 * bootefi_device_path */ 98 .guid = &efi_guid_device_path, 99 .open = &bootefi_open_dp, 100 } 101 }, 102 }; 103 104 static void *copy_fdt(void *fdt) 105 { 106 u64 fdt_size = fdt_totalsize(fdt); 107 void *new_fdt; 108 109 /* Give us 64kb breathing room */ 110 fdt_size += 64 * 1024; 111 112 new_fdt = malloc(fdt_size); 113 memcpy(new_fdt, fdt, fdt_totalsize(fdt)); 114 fdt_set_totalsize(new_fdt, fdt_size); 115 116 return new_fdt; 117 } 118 119 /* 120 * Load an EFI payload into a newly allocated piece of memory, register all 121 * EFI objects it would want to access and jump to it. 122 */ 123 static unsigned long do_bootefi_exec(void *efi) 124 { 125 ulong (*entry)(void *image_handle, struct efi_system_table *st); 126 ulong fdt_pages, fdt_size, fdt_start, fdt_end; 127 bootm_headers_t img = { 0 }; 128 void *fdt = working_fdt; 129 130 /* 131 * gd lives in a fixed register which may get clobbered while we execute 132 * the payload. So save it here and restore it on every callback entry 133 */ 134 efi_save_gd(); 135 136 /* Update system table to point to our currently loaded FDT */ 137 138 /* Fall back to included fdt if none was manually loaded */ 139 if (!fdt && gd->fdt_blob) 140 fdt = (void *)gd->fdt_blob; 141 142 if (fdt) { 143 /* Prepare fdt for payload */ 144 fdt = copy_fdt(fdt); 145 146 if (image_setup_libfdt(&img, fdt, 0, NULL)) { 147 printf("ERROR: Failed to process device tree\n"); 148 return -EINVAL; 149 } 150 151 /* Link to it in the efi tables */ 152 systab.tables[0].guid = EFI_FDT_GUID; 153 systab.tables[0].table = fdt; 154 systab.nr_tables = 1; 155 156 /* And reserve the space in the memory map */ 157 fdt_start = ((ulong)fdt) & ~EFI_PAGE_MASK; 158 fdt_end = ((ulong)fdt) + fdt_totalsize(fdt); 159 fdt_size = (fdt_end - fdt_start) + EFI_PAGE_MASK; 160 fdt_pages = fdt_size >> EFI_PAGE_SHIFT; 161 /* Give a bootloader the chance to modify the device tree */ 162 fdt_pages += 2; 163 efi_add_memory_map(fdt_start, fdt_pages, 164 EFI_BOOT_SERVICES_DATA, true); 165 } else { 166 printf("WARNING: No device tree loaded, expect boot to fail\n"); 167 systab.nr_tables = 0; 168 } 169 170 /* Load the EFI payload */ 171 entry = efi_load_pe(efi, &loaded_image_info); 172 if (!entry) 173 return -ENOENT; 174 175 /* Initialize and populate EFI object list */ 176 INIT_LIST_HEAD(&efi_obj_list); 177 list_add_tail(&loaded_image_info_obj.link, &efi_obj_list); 178 list_add_tail(&bootefi_device_obj.link, &efi_obj_list); 179 #ifdef CONFIG_PARTITIONS 180 efi_disk_register(); 181 #endif 182 #ifdef CONFIG_LCD 183 efi_gop_register(); 184 #endif 185 186 /* Call our payload! */ 187 #ifdef DEBUG_EFI 188 printf("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry); 189 #endif 190 return entry(&loaded_image_info, &systab); 191 } 192 193 194 /* Interpreter command to boot an arbitrary EFI image from memory */ 195 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 196 { 197 char *saddr; 198 unsigned long addr; 199 int r = 0; 200 201 if (argc < 2) 202 return 1; 203 saddr = argv[1]; 204 205 addr = simple_strtoul(saddr, NULL, 16); 206 207 printf("## Starting EFI application at 0x%08lx ...\n", addr); 208 r = do_bootefi_exec((void *)addr); 209 printf("## Application terminated, r = %d\n", r); 210 211 if (r != 0) 212 r = 1; 213 214 return r; 215 } 216 217 #ifdef CONFIG_SYS_LONGHELP 218 static char bootefi_help_text[] = 219 "<image address>\n" 220 " - boot EFI payload stored at address <image address>\n" 221 "\n" 222 "Since most EFI payloads want to have a device tree provided, please\n" 223 "make sure you load a device tree using the fdt addr command before\n" 224 "executing bootefi.\n"; 225 #endif 226 227 U_BOOT_CMD( 228 bootefi, 2, 0, do_bootefi, 229 "Boots an EFI payload from memory\n", 230 bootefi_help_text 231 ); 232 233 void efi_set_bootdev(const char *dev, const char *devnr, const char *path) 234 { 235 __maybe_unused struct blk_desc *desc; 236 char devname[32] = { 0 }; /* dp->str is u16[32] long */ 237 char *colon; 238 239 /* Assemble the condensed device name we use in efi_disk.c */ 240 snprintf(devname, sizeof(devname), "%s%s", dev, devnr); 241 colon = strchr(devname, ':'); 242 243 #ifdef CONFIG_ISO_PARTITION 244 /* For ISOs we create partition block devices */ 245 desc = blk_get_dev(dev, simple_strtol(devnr, NULL, 10)); 246 if (desc && (desc->type != DEV_TYPE_UNKNOWN) && 247 (desc->part_type == PART_TYPE_ISO)) { 248 if (!colon) 249 snprintf(devname, sizeof(devname), "%s%s:1", dev, 250 devnr); 251 colon = NULL; 252 } 253 #endif 254 255 if (colon) 256 *colon = '\0'; 257 258 /* Patch bootefi_device_path to the target device */ 259 memset(bootefi_device_path[0].str, 0, sizeof(bootefi_device_path[0].str)); 260 ascii2unicode(bootefi_device_path[0].str, devname); 261 262 /* Patch bootefi_image_path to the target file path */ 263 memset(bootefi_image_path[0].str, 0, sizeof(bootefi_image_path[0].str)); 264 snprintf(devname, sizeof(devname), "%s", path); 265 ascii2unicode(bootefi_image_path[0].str, devname); 266 } 267