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 <memalign.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 unsigned long fdt_ram_start = -1L, fdt_pages; 108 u64 new_fdt_addr; 109 void *new_fdt; 110 int i; 111 112 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { 113 u64 ram_start = gd->bd->bi_dram[i].start; 114 u64 ram_size = gd->bd->bi_dram[i].size; 115 116 if (!ram_size) 117 continue; 118 119 if (ram_start < fdt_ram_start) 120 fdt_ram_start = ram_start; 121 } 122 123 /* Give us at least 4kb breathing room */ 124 fdt_size = ALIGN(fdt_size + 4096, 4096); 125 fdt_pages = fdt_size >> EFI_PAGE_SHIFT; 126 127 /* Safe fdt location is at 128MB */ 128 new_fdt_addr = fdt_ram_start + (128 * 1024 * 1024) + fdt_size; 129 if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA, fdt_pages, 130 &new_fdt_addr) != EFI_SUCCESS) { 131 /* If we can't put it there, put it somewhere */ 132 new_fdt_addr = (ulong)memalign(4096, fdt_size); 133 } 134 new_fdt = (void*)(ulong)new_fdt_addr; 135 memcpy(new_fdt, fdt, fdt_totalsize(fdt)); 136 fdt_set_totalsize(new_fdt, fdt_size); 137 138 return new_fdt; 139 } 140 141 /* 142 * Load an EFI payload into a newly allocated piece of memory, register all 143 * EFI objects it would want to access and jump to it. 144 */ 145 static unsigned long do_bootefi_exec(void *efi, void *fdt) 146 { 147 ulong (*entry)(void *image_handle, struct efi_system_table *st); 148 ulong fdt_pages, fdt_size, fdt_start, fdt_end; 149 bootm_headers_t img = { 0 }; 150 151 /* 152 * gd lives in a fixed register which may get clobbered while we execute 153 * the payload. So save it here and restore it on every callback entry 154 */ 155 efi_save_gd(); 156 157 if (fdt && !fdt_check_header(fdt)) { 158 /* Prepare fdt for payload */ 159 fdt = copy_fdt(fdt); 160 161 if (image_setup_libfdt(&img, fdt, 0, NULL)) { 162 printf("ERROR: Failed to process device tree\n"); 163 return -EINVAL; 164 } 165 166 /* Link to it in the efi tables */ 167 systab.tables[0].guid = EFI_FDT_GUID; 168 systab.tables[0].table = fdt; 169 systab.nr_tables = 1; 170 171 /* And reserve the space in the memory map */ 172 fdt_start = ((ulong)fdt) & ~EFI_PAGE_MASK; 173 fdt_end = ((ulong)fdt) + fdt_totalsize(fdt); 174 fdt_size = (fdt_end - fdt_start) + EFI_PAGE_MASK; 175 fdt_pages = fdt_size >> EFI_PAGE_SHIFT; 176 /* Give a bootloader the chance to modify the device tree */ 177 fdt_pages += 2; 178 efi_add_memory_map(fdt_start, fdt_pages, 179 EFI_BOOT_SERVICES_DATA, true); 180 } else { 181 printf("WARNING: Invalid device tree, expect boot to fail\n"); 182 systab.nr_tables = 0; 183 } 184 185 /* Load the EFI payload */ 186 entry = efi_load_pe(efi, &loaded_image_info); 187 if (!entry) 188 return -ENOENT; 189 190 /* Initialize and populate EFI object list */ 191 INIT_LIST_HEAD(&efi_obj_list); 192 list_add_tail(&loaded_image_info_obj.link, &efi_obj_list); 193 list_add_tail(&bootefi_device_obj.link, &efi_obj_list); 194 #ifdef CONFIG_PARTITIONS 195 efi_disk_register(); 196 #endif 197 #ifdef CONFIG_LCD 198 efi_gop_register(); 199 #endif 200 #ifdef CONFIG_NET 201 void *nethandle = loaded_image_info.device_handle; 202 efi_net_register(&nethandle); 203 204 if (!memcmp(bootefi_device_path[0].str, "N\0e\0t", 6)) 205 loaded_image_info.device_handle = nethandle; 206 #endif 207 208 /* Call our payload! */ 209 debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry); 210 211 if (setjmp(&loaded_image_info.exit_jmp)) { 212 efi_status_t status = loaded_image_info.exit_status; 213 return status == EFI_SUCCESS ? 0 : -EINVAL; 214 } 215 216 return entry(&loaded_image_info, &systab); 217 } 218 219 220 /* Interpreter command to boot an arbitrary EFI image from memory */ 221 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 222 { 223 char *saddr, *sfdt; 224 unsigned long addr, fdt_addr = 0; 225 int r = 0; 226 227 if (argc < 2) 228 return 1; 229 saddr = argv[1]; 230 231 addr = simple_strtoul(saddr, NULL, 16); 232 233 if (argc > 2) { 234 sfdt = argv[2]; 235 fdt_addr = simple_strtoul(sfdt, NULL, 16); 236 } 237 238 printf("## Starting EFI application at 0x%08lx ...\n", addr); 239 r = do_bootefi_exec((void *)addr, (void*)fdt_addr); 240 printf("## Application terminated, r = %d\n", r); 241 242 if (r != 0) 243 r = 1; 244 245 return r; 246 } 247 248 #ifdef CONFIG_SYS_LONGHELP 249 static char bootefi_help_text[] = 250 "<image address> [fdt address]\n" 251 " - boot EFI payload stored at address <image address>.\n" 252 " If specified, the device tree located at <fdt address> gets\n" 253 " exposed as EFI configuration table.\n"; 254 #endif 255 256 U_BOOT_CMD( 257 bootefi, 3, 0, do_bootefi, 258 "Boots an EFI payload from memory", 259 bootefi_help_text 260 ); 261 262 void efi_set_bootdev(const char *dev, const char *devnr, const char *path) 263 { 264 __maybe_unused struct blk_desc *desc; 265 char devname[32] = { 0 }; /* dp->str is u16[32] long */ 266 char *colon; 267 268 /* Assemble the condensed device name we use in efi_disk.c */ 269 snprintf(devname, sizeof(devname), "%s%s", dev, devnr); 270 colon = strchr(devname, ':'); 271 272 #ifdef CONFIG_ISO_PARTITION 273 /* For ISOs we create partition block devices */ 274 desc = blk_get_dev(dev, simple_strtol(devnr, NULL, 10)); 275 if (desc && (desc->type != DEV_TYPE_UNKNOWN) && 276 (desc->part_type == PART_TYPE_ISO)) { 277 if (!colon) 278 snprintf(devname, sizeof(devname), "%s%s:1", dev, 279 devnr); 280 colon = NULL; 281 } 282 #endif 283 284 if (colon) 285 *colon = '\0'; 286 287 /* Patch bootefi_device_path to the target device */ 288 memset(bootefi_device_path[0].str, 0, sizeof(bootefi_device_path[0].str)); 289 ascii2unicode(bootefi_device_path[0].str, devname); 290 291 /* Patch bootefi_image_path to the target file path */ 292 memset(bootefi_image_path[0].str, 0, sizeof(bootefi_image_path[0].str)); 293 if (strcmp(dev, "Net")) { 294 /* Add leading / to fs paths, because they're absolute */ 295 snprintf(devname, sizeof(devname), "/%s", path); 296 } else { 297 snprintf(devname, sizeof(devname), "%s", path); 298 } 299 ascii2unicode(bootefi_image_path[0].str, devname); 300 } 301