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 <dm/device.h> 12 #include <efi_loader.h> 13 #include <errno.h> 14 #include <libfdt.h> 15 #include <libfdt_env.h> 16 #include <memalign.h> 17 #include <asm/global_data.h> 18 #include <asm-generic/sections.h> 19 #include <linux/linkage.h> 20 21 DECLARE_GLOBAL_DATA_PTR; 22 23 /* 24 * When booting using the "bootefi" command, we don't know which 25 * physical device the file came from. So we create a pseudo-device 26 * called "bootefi" with the device path /bootefi. 27 * 28 * In addition to the originating device we also declare the file path 29 * of "bootefi" based loads to be /bootefi. 30 */ 31 static struct efi_device_path_file_path bootefi_image_path[] = { 32 { 33 .dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE, 34 .dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH, 35 .dp.length = sizeof(bootefi_image_path[0]), 36 .str = { 'b','o','o','t','e','f','i' }, 37 }, { 38 .dp.type = DEVICE_PATH_TYPE_END, 39 .dp.sub_type = DEVICE_PATH_SUB_TYPE_END, 40 .dp.length = sizeof(bootefi_image_path[0]), 41 } 42 }; 43 44 static struct efi_device_path_file_path bootefi_device_path[] = { 45 { 46 .dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE, 47 .dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH, 48 .dp.length = sizeof(bootefi_image_path[0]), 49 .str = { 'b','o','o','t','e','f','i' }, 50 }, { 51 .dp.type = DEVICE_PATH_TYPE_END, 52 .dp.sub_type = DEVICE_PATH_SUB_TYPE_END, 53 .dp.length = sizeof(bootefi_image_path[0]), 54 } 55 }; 56 57 static efi_status_t EFIAPI bootefi_open_dp(void *handle, efi_guid_t *protocol, 58 void **protocol_interface, void *agent_handle, 59 void *controller_handle, uint32_t attributes) 60 { 61 *protocol_interface = bootefi_device_path; 62 return EFI_SUCCESS; 63 } 64 65 /* The EFI loaded_image interface for the image executed via "bootefi" */ 66 static struct efi_loaded_image loaded_image_info = { 67 .device_handle = bootefi_device_path, 68 .file_path = bootefi_image_path, 69 }; 70 71 /* The EFI object struct for the image executed via "bootefi" */ 72 static struct efi_object loaded_image_info_obj = { 73 .handle = &loaded_image_info, 74 .protocols = { 75 { 76 /* 77 * When asking for the loaded_image interface, just 78 * return handle which points to loaded_image_info 79 */ 80 .guid = &efi_guid_loaded_image, 81 .open = &efi_return_handle, 82 }, 83 { 84 /* 85 * When asking for the device path interface, return 86 * bootefi_device_path 87 */ 88 .guid = &efi_guid_device_path, 89 .open = &bootefi_open_dp, 90 }, 91 }, 92 }; 93 94 /* The EFI object struct for the device the "bootefi" image was loaded from */ 95 static struct efi_object bootefi_device_obj = { 96 .handle = bootefi_device_path, 97 .protocols = { 98 { 99 /* When asking for the device path interface, return 100 * bootefi_device_path */ 101 .guid = &efi_guid_device_path, 102 .open = &bootefi_open_dp, 103 } 104 }, 105 }; 106 107 static void *copy_fdt(void *fdt) 108 { 109 u64 fdt_size = fdt_totalsize(fdt); 110 unsigned long fdt_ram_start = -1L, fdt_pages; 111 u64 new_fdt_addr; 112 void *new_fdt; 113 int i; 114 115 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { 116 u64 ram_start = gd->bd->bi_dram[i].start; 117 u64 ram_size = gd->bd->bi_dram[i].size; 118 119 if (!ram_size) 120 continue; 121 122 if (ram_start < fdt_ram_start) 123 fdt_ram_start = ram_start; 124 } 125 126 /* Give us at least 4kb breathing room */ 127 fdt_size = ALIGN(fdt_size + 4096, 4096); 128 fdt_pages = fdt_size >> EFI_PAGE_SHIFT; 129 130 /* Safe fdt location is at 128MB */ 131 new_fdt_addr = fdt_ram_start + (128 * 1024 * 1024) + fdt_size; 132 if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA, fdt_pages, 133 &new_fdt_addr) != EFI_SUCCESS) { 134 /* If we can't put it there, put it somewhere */ 135 new_fdt_addr = (ulong)memalign(4096, fdt_size); 136 } 137 new_fdt = (void*)(ulong)new_fdt_addr; 138 memcpy(new_fdt, fdt, fdt_totalsize(fdt)); 139 fdt_set_totalsize(new_fdt, fdt_size); 140 141 return new_fdt; 142 } 143 144 /* 145 * Load an EFI payload into a newly allocated piece of memory, register all 146 * EFI objects it would want to access and jump to it. 147 */ 148 static unsigned long do_bootefi_exec(void *efi, void *fdt) 149 { 150 ulong (*entry)(void *image_handle, struct efi_system_table *st) 151 asmlinkage; 152 ulong fdt_pages, fdt_size, fdt_start, fdt_end; 153 bootm_headers_t img = { 0 }; 154 155 /* 156 * gd lives in a fixed register which may get clobbered while we execute 157 * the payload. So save it here and restore it on every callback entry 158 */ 159 efi_save_gd(); 160 161 if (fdt && !fdt_check_header(fdt)) { 162 /* Prepare fdt for payload */ 163 fdt = copy_fdt(fdt); 164 165 if (image_setup_libfdt(&img, fdt, 0, NULL)) { 166 printf("ERROR: Failed to process device tree\n"); 167 return -EINVAL; 168 } 169 170 /* Link to it in the efi tables */ 171 systab.tables[0].guid = EFI_FDT_GUID; 172 systab.tables[0].table = fdt; 173 systab.nr_tables = 1; 174 175 /* And reserve the space in the memory map */ 176 fdt_start = ((ulong)fdt) & ~EFI_PAGE_MASK; 177 fdt_end = ((ulong)fdt) + fdt_totalsize(fdt); 178 fdt_size = (fdt_end - fdt_start) + EFI_PAGE_MASK; 179 fdt_pages = fdt_size >> EFI_PAGE_SHIFT; 180 /* Give a bootloader the chance to modify the device tree */ 181 fdt_pages += 2; 182 efi_add_memory_map(fdt_start, fdt_pages, 183 EFI_BOOT_SERVICES_DATA, true); 184 } else { 185 printf("WARNING: Invalid device tree, expect boot to fail\n"); 186 systab.nr_tables = 0; 187 } 188 189 /* Load the EFI payload */ 190 entry = efi_load_pe(efi, &loaded_image_info); 191 if (!entry) 192 return -ENOENT; 193 194 /* Initialize and populate EFI object list */ 195 INIT_LIST_HEAD(&efi_obj_list); 196 list_add_tail(&loaded_image_info_obj.link, &efi_obj_list); 197 list_add_tail(&bootefi_device_obj.link, &efi_obj_list); 198 #ifdef CONFIG_PARTITIONS 199 efi_disk_register(); 200 #endif 201 #ifdef CONFIG_LCD 202 efi_gop_register(); 203 #endif 204 #ifdef CONFIG_NET 205 void *nethandle = loaded_image_info.device_handle; 206 efi_net_register(&nethandle); 207 208 if (!memcmp(bootefi_device_path[0].str, "N\0e\0t", 6)) 209 loaded_image_info.device_handle = nethandle; 210 else 211 loaded_image_info.device_handle = bootefi_device_path; 212 #endif 213 #ifdef CONFIG_GENERATE_SMBIOS_TABLE 214 efi_smbios_register(); 215 #endif 216 217 /* Initialize EFI runtime services */ 218 efi_reset_system_init(); 219 efi_get_time_init(); 220 221 /* Call our payload! */ 222 debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry); 223 224 if (setjmp(&loaded_image_info.exit_jmp)) { 225 efi_status_t status = loaded_image_info.exit_status; 226 return status == EFI_SUCCESS ? 0 : -EINVAL; 227 } 228 229 return entry(&loaded_image_info, &systab); 230 } 231 232 233 /* Interpreter command to boot an arbitrary EFI image from memory */ 234 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 235 { 236 char *saddr, *sfdt; 237 unsigned long addr, fdt_addr = 0; 238 int r = 0; 239 240 if (argc < 2) 241 return CMD_RET_USAGE; 242 saddr = argv[1]; 243 244 addr = simple_strtoul(saddr, NULL, 16); 245 246 if (argc > 2) { 247 sfdt = argv[2]; 248 fdt_addr = simple_strtoul(sfdt, NULL, 16); 249 } 250 251 printf("## Starting EFI application at 0x%08lx ...\n", addr); 252 r = do_bootefi_exec((void *)addr, (void*)fdt_addr); 253 printf("## Application terminated, r = %d\n", r); 254 255 if (r != 0) 256 r = 1; 257 258 return r; 259 } 260 261 #ifdef CONFIG_SYS_LONGHELP 262 static char bootefi_help_text[] = 263 "<image address> [fdt address]\n" 264 " - boot EFI payload stored at address <image address>.\n" 265 " If specified, the device tree located at <fdt address> gets\n" 266 " exposed as EFI configuration table.\n"; 267 #endif 268 269 U_BOOT_CMD( 270 bootefi, 3, 0, do_bootefi, 271 "Boots an EFI payload from memory", 272 bootefi_help_text 273 ); 274 275 void efi_set_bootdev(const char *dev, const char *devnr, const char *path) 276 { 277 __maybe_unused struct blk_desc *desc; 278 char devname[32] = { 0 }; /* dp->str is u16[32] long */ 279 char *colon; 280 281 #if defined(CONFIG_BLK) || defined(CONFIG_ISO_PARTITION) 282 desc = blk_get_dev(dev, simple_strtol(devnr, NULL, 10)); 283 #endif 284 285 #ifdef CONFIG_BLK 286 if (desc) { 287 snprintf(devname, sizeof(devname), "%s", desc->bdev->name); 288 } else 289 #endif 290 291 { 292 /* Assemble the condensed device name we use in efi_disk.c */ 293 snprintf(devname, sizeof(devname), "%s%s", dev, devnr); 294 } 295 296 colon = strchr(devname, ':'); 297 298 #ifdef CONFIG_ISO_PARTITION 299 /* For ISOs we create partition block devices */ 300 if (desc && (desc->type != DEV_TYPE_UNKNOWN) && 301 (desc->part_type == PART_TYPE_ISO)) { 302 if (!colon) 303 snprintf(devname, sizeof(devname), "%s:1", devname); 304 305 colon = NULL; 306 } 307 #endif 308 309 if (colon) 310 *colon = '\0'; 311 312 /* Patch bootefi_device_path to the target device */ 313 memset(bootefi_device_path[0].str, 0, sizeof(bootefi_device_path[0].str)); 314 ascii2unicode(bootefi_device_path[0].str, devname); 315 316 /* Patch bootefi_image_path to the target file path */ 317 memset(bootefi_image_path[0].str, 0, sizeof(bootefi_image_path[0].str)); 318 if (strcmp(dev, "Net")) { 319 /* Add leading / to fs paths, because they're absolute */ 320 snprintf(devname, sizeof(devname), "/%s", path); 321 } else { 322 snprintf(devname, sizeof(devname), "%s", path); 323 } 324 ascii2unicode(bootefi_image_path[0].str, devname); 325 } 326