1 /* 2 * Copyright (C) 2016 Google, Inc 3 * Written by Simon Glass <sjg@chromium.org> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <errno.h> 10 #include <image.h> 11 #include <linux/libfdt.h> 12 #include <spl.h> 13 14 #ifndef CONFIG_SYS_BOOTM_LEN 15 #define CONFIG_SYS_BOOTM_LEN (64 << 20) 16 #endif 17 18 /** 19 * spl_fit_get_image_name(): By using the matching configuration subnode, 20 * retrieve the name of an image, specified by a property name and an index 21 * into that. 22 * @fit: Pointer to the FDT blob. 23 * @images: Offset of the /images subnode. 24 * @type: Name of the property within the configuration subnode. 25 * @index: Index into the list of strings in this property. 26 * @outname: Name of the image 27 * 28 * Return: 0 on success, or a negative error number 29 */ 30 static int spl_fit_get_image_name(const void *fit, int images, 31 const char *type, int index, 32 char **outname) 33 { 34 const char *name, *str; 35 __maybe_unused int node; 36 int conf_node; 37 int len, i; 38 39 conf_node = fit_find_config_node(fit); 40 if (conf_node < 0) { 41 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT 42 printf("No matching DT out of these options:\n"); 43 for (node = fdt_first_subnode(fit, conf_node); 44 node >= 0; 45 node = fdt_next_subnode(fit, node)) { 46 name = fdt_getprop(fit, node, "description", &len); 47 printf(" %s\n", name); 48 } 49 #endif 50 return conf_node; 51 } 52 53 name = fdt_getprop(fit, conf_node, type, &len); 54 if (!name) { 55 debug("cannot find property '%s': %d\n", type, len); 56 return -EINVAL; 57 } 58 59 str = name; 60 for (i = 0; i < index; i++) { 61 str = strchr(str, '\0') + 1; 62 if (!str || (str - name >= len)) { 63 debug("no string for index %d\n", index); 64 return -E2BIG; 65 } 66 } 67 68 *outname = (char *)str; 69 return 0; 70 } 71 72 /** 73 * spl_fit_get_image_node(): By using the matching configuration subnode, 74 * retrieve the name of an image, specified by a property name and an index 75 * into that. 76 * @fit: Pointer to the FDT blob. 77 * @images: Offset of the /images subnode. 78 * @type: Name of the property within the configuration subnode. 79 * @index: Index into the list of strings in this property. 80 * 81 * Return: the node offset of the respective image node or a negative 82 * error number. 83 */ 84 static int spl_fit_get_image_node(const void *fit, int images, 85 const char *type, int index) 86 { 87 char *str; 88 int err; 89 int node; 90 91 err = spl_fit_get_image_name(fit, images, type, index, &str); 92 if (err) 93 return err; 94 95 debug("%s: '%s'\n", type, str); 96 97 node = fdt_subnode_offset(fit, images, str); 98 if (node < 0) { 99 debug("cannot find image node '%s': %d\n", str, node); 100 return -EINVAL; 101 } 102 103 return node; 104 } 105 106 static int get_aligned_image_offset(struct spl_load_info *info, int offset) 107 { 108 /* 109 * If it is a FS read, get the first address before offset which is 110 * aligned to ARCH_DMA_MINALIGN. If it is raw read return the 111 * block number to which offset belongs. 112 */ 113 if (info->filename) 114 return offset & ~(ARCH_DMA_MINALIGN - 1); 115 116 return offset / info->bl_len; 117 } 118 119 static int get_aligned_image_overhead(struct spl_load_info *info, int offset) 120 { 121 /* 122 * If it is a FS read, get the difference between the offset and 123 * the first address before offset which is aligned to 124 * ARCH_DMA_MINALIGN. If it is raw read return the offset within the 125 * block. 126 */ 127 if (info->filename) 128 return offset & (ARCH_DMA_MINALIGN - 1); 129 130 return offset % info->bl_len; 131 } 132 133 static int get_aligned_image_size(struct spl_load_info *info, int data_size, 134 int offset) 135 { 136 data_size = data_size + get_aligned_image_overhead(info, offset); 137 138 if (info->filename) 139 return data_size; 140 141 return (data_size + info->bl_len - 1) / info->bl_len; 142 } 143 144 /** 145 * spl_load_fit_image(): load the image described in a certain FIT node 146 * @info: points to information about the device to load data from 147 * @sector: the start sector of the FIT image on the device 148 * @fit: points to the flattened device tree blob describing the FIT 149 * image 150 * @base_offset: the beginning of the data area containing the actual 151 * image data, relative to the beginning of the FIT 152 * @node: offset of the DT node describing the image to load (relative 153 * to @fit) 154 * @image_info: will be filled with information about the loaded image 155 * If the FIT node does not contain a "load" (address) property, 156 * the image gets loaded to the address pointed to by the 157 * load_addr member in this struct. 158 * 159 * Return: 0 on success or a negative error number. 160 */ 161 static int spl_load_fit_image(struct spl_load_info *info, ulong sector, 162 void *fit, ulong base_offset, int node, 163 struct spl_image_info *image_info) 164 { 165 int offset; 166 size_t length; 167 int len; 168 ulong size; 169 ulong load_addr, load_ptr; 170 void *src; 171 ulong overhead; 172 int nr_sectors; 173 int align_len = ARCH_DMA_MINALIGN - 1; 174 uint8_t image_comp = -1, type = -1; 175 const void *data; 176 bool external_data = false; 177 #ifdef CONFIG_SPL_FIT_SIGNATURE 178 int ret; 179 #endif 180 181 if (IS_ENABLED(CONFIG_SPL_OS_BOOT) && IS_ENABLED(CONFIG_SPL_GZIP)) { 182 if (fit_image_get_comp(fit, node, &image_comp)) 183 puts("Cannot get image compression format.\n"); 184 else 185 debug("%s ", genimg_get_comp_name(image_comp)); 186 187 if (fit_image_get_type(fit, node, &type)) 188 puts("Cannot get image type.\n"); 189 else 190 debug("%s ", genimg_get_type_name(type)); 191 } 192 193 if (fit_image_get_load(fit, node, &load_addr)) 194 load_addr = image_info->load_addr; 195 196 if (!fit_image_get_data_position(fit, node, &offset)) { 197 external_data = true; 198 } else if (!fit_image_get_data_offset(fit, node, &offset)) { 199 offset += base_offset; 200 external_data = true; 201 } 202 203 if (external_data) { 204 /* External data */ 205 if (fit_image_get_data_size(fit, node, &len)) 206 return -ENOENT; 207 208 load_ptr = (load_addr + align_len) & ~align_len; 209 length = len; 210 211 overhead = get_aligned_image_overhead(info, offset); 212 nr_sectors = get_aligned_image_size(info, length, offset); 213 214 if (info->read(info, 215 sector + get_aligned_image_offset(info, offset), 216 nr_sectors, (void *)load_ptr) != nr_sectors) 217 return -EIO; 218 219 debug("External data: dst=%lx, offset=%x, size=%lx\n", 220 load_ptr, offset, (unsigned long)length); 221 src = (void *)load_ptr + overhead; 222 } else { 223 /* Embedded data */ 224 if (fit_image_get_data(fit, node, &data, &length)) { 225 puts("Cannot get image data/size\n"); 226 return -ENOENT; 227 } 228 debug("Embedded data: dst=%lx, size=%lx\n", load_addr, 229 (unsigned long)length); 230 src = (void *)data; 231 } 232 233 #ifdef CONFIG_SPL_FIT_IMAGE_POST_PROCESS 234 board_fit_image_post_process(&src, &length); 235 #endif 236 237 if (IS_ENABLED(CONFIG_SPL_OS_BOOT) && 238 IS_ENABLED(CONFIG_SPL_GZIP) && 239 image_comp == IH_COMP_GZIP && 240 type == IH_TYPE_KERNEL) { 241 size = length; 242 if (gunzip((void *)load_addr, CONFIG_SYS_BOOTM_LEN, 243 src, &size)) { 244 puts("Uncompressing error\n"); 245 return -EIO; 246 } 247 length = size; 248 } else { 249 memcpy((void *)load_addr, src, length); 250 } 251 252 if (image_info) { 253 image_info->load_addr = load_addr; 254 image_info->size = length; 255 image_info->entry_point = fdt_getprop_u32(fit, node, "entry"); 256 } 257 258 #ifdef CONFIG_SPL_FIT_SIGNATURE 259 printf("## Checking hash(es) for Image %s ...\n", 260 fit_get_name(fit, node, NULL)); 261 ret = fit_image_verify_with_data(fit, node, 262 (const void *)load_addr, length); 263 printf("\n"); 264 return !ret; 265 #else 266 return 0; 267 #endif 268 } 269 270 static int spl_fit_append_fdt(struct spl_image_info *spl_image, 271 struct spl_load_info *info, ulong sector, 272 void *fit, int images, ulong base_offset) 273 { 274 struct spl_image_info image_info; 275 int node, ret; 276 277 /* Figure out which device tree the board wants to use */ 278 node = spl_fit_get_image_node(fit, images, FIT_FDT_PROP, 0); 279 if (node < 0) { 280 debug("%s: cannot find FDT node\n", __func__); 281 return node; 282 } 283 284 /* 285 * Read the device tree and place it after the image. 286 * Align the destination address to ARCH_DMA_MINALIGN. 287 */ 288 image_info.load_addr = spl_image->load_addr + spl_image->size; 289 ret = spl_load_fit_image(info, sector, fit, base_offset, node, 290 &image_info); 291 292 if (ret < 0) 293 return ret; 294 295 /* Make the load-address of the FDT available for the SPL framework */ 296 spl_image->fdt_addr = (void *)image_info.load_addr; 297 #if !CONFIG_IS_ENABLED(FIT_IMAGE_TINY) 298 /* Try to make space, so we can inject details on the loadables */ 299 ret = fdt_shrink_to_minimum(spl_image->fdt_addr, 8192); 300 #endif 301 302 return ret; 303 } 304 305 static int spl_fit_record_loadable(const void *fit, int images, int index, 306 void *blob, struct spl_image_info *image) 307 { 308 int ret = 0; 309 #if !CONFIG_IS_ENABLED(FIT_IMAGE_TINY) 310 char *name; 311 int node; 312 313 ret = spl_fit_get_image_name(fit, images, "loadables", 314 index, &name); 315 if (ret < 0) 316 return ret; 317 318 node = spl_fit_get_image_node(fit, images, "loadables", index); 319 320 ret = fdt_record_loadable(blob, index, name, image->load_addr, 321 image->size, image->entry_point, 322 fdt_getprop(fit, node, "type", NULL), 323 fdt_getprop(fit, node, "os", NULL)); 324 #endif 325 return ret; 326 } 327 328 static int spl_fit_image_get_os(const void *fit, int noffset, uint8_t *os) 329 { 330 #if CONFIG_IS_ENABLED(FIT_IMAGE_TINY) 331 return -ENOTSUPP; 332 #else 333 return fit_image_get_os(fit, noffset, os); 334 #endif 335 } 336 337 int spl_load_simple_fit(struct spl_image_info *spl_image, 338 struct spl_load_info *info, ulong sector, void *fit) 339 { 340 int sectors; 341 ulong size; 342 unsigned long count; 343 struct spl_image_info image_info; 344 int node = -1; 345 int images, ret; 346 int base_offset, align_len = ARCH_DMA_MINALIGN - 1; 347 int index = 0; 348 349 /* 350 * For FIT with external data, figure out where the external images 351 * start. This is the base for the data-offset properties in each 352 * image. 353 */ 354 size = fdt_totalsize(fit); 355 size = (size + 3) & ~3; 356 base_offset = (size + 3) & ~3; 357 358 /* 359 * So far we only have one block of data from the FIT. Read the entire 360 * thing, including that first block, placing it so it finishes before 361 * where we will load the image. 362 * 363 * Note that we will load the image such that its first byte will be 364 * at the load address. Since that byte may be part-way through a 365 * block, we may load the image up to one block before the load 366 * address. So take account of that here by subtracting an addition 367 * block length from the FIT start position. 368 * 369 * In fact the FIT has its own load address, but we assume it cannot 370 * be before CONFIG_SYS_TEXT_BASE. 371 * 372 * For FIT with data embedded, data is loaded as part of FIT image. 373 * For FIT with external data, data is not loaded in this step. 374 */ 375 fit = (void *)((CONFIG_SYS_TEXT_BASE - size - info->bl_len - 376 align_len) & ~align_len); 377 sectors = get_aligned_image_size(info, size, 0); 378 count = info->read(info, sector, sectors, fit); 379 debug("fit read sector %lx, sectors=%d, dst=%p, count=%lu\n", 380 sector, sectors, fit, count); 381 if (count == 0) 382 return -EIO; 383 384 /* find the node holding the images information */ 385 images = fdt_path_offset(fit, FIT_IMAGES_PATH); 386 if (images < 0) { 387 debug("%s: Cannot find /images node: %d\n", __func__, images); 388 return -1; 389 } 390 391 /* 392 * Find the U-Boot image using the following search order: 393 * - start at 'firmware' (e.g. an ARM Trusted Firmware) 394 * - fall back 'kernel' (e.g. a Falcon-mode OS boot 395 * - fall back to using the first 'loadables' entry 396 */ 397 if (node < 0) 398 node = spl_fit_get_image_node(fit, images, FIT_FIRMWARE_PROP, 399 0); 400 #ifdef CONFIG_SPL_OS_BOOT 401 if (node < 0) 402 node = spl_fit_get_image_node(fit, images, FIT_KERNEL_PROP, 0); 403 #endif 404 if (node < 0) { 405 debug("could not find firmware image, trying loadables...\n"); 406 node = spl_fit_get_image_node(fit, images, "loadables", 0); 407 /* 408 * If we pick the U-Boot image from "loadables", start at 409 * the second image when later loading additional images. 410 */ 411 index = 1; 412 } 413 if (node < 0) { 414 debug("%s: Cannot find u-boot image node: %d\n", 415 __func__, node); 416 return -1; 417 } 418 419 /* Load the image and set up the spl_image structure */ 420 ret = spl_load_fit_image(info, sector, fit, base_offset, node, 421 spl_image); 422 if (ret) 423 return ret; 424 425 /* 426 * For backward compatibility, we treat the first node that is 427 * as a U-Boot image, if no OS-type has been declared. 428 */ 429 if (!spl_fit_image_get_os(fit, node, &spl_image->os)) 430 debug("Image OS is %s\n", genimg_get_os_name(spl_image->os)); 431 #if !defined(CONFIG_SPL_OS_BOOT) 432 else 433 spl_image->os = IH_OS_U_BOOT; 434 #endif 435 436 /* 437 * Booting a next-stage U-Boot may require us to append the FDT. 438 * We allow this to fail, as the U-Boot image might embed its FDT. 439 */ 440 if (spl_image->os == IH_OS_U_BOOT) 441 spl_fit_append_fdt(spl_image, info, sector, fit, 442 images, base_offset); 443 444 /* Now check if there are more images for us to load */ 445 for (; ; index++) { 446 uint8_t os_type = IH_OS_INVALID; 447 448 node = spl_fit_get_image_node(fit, images, "loadables", index); 449 if (node < 0) 450 break; 451 452 ret = spl_load_fit_image(info, sector, fit, base_offset, node, 453 &image_info); 454 if (ret < 0) 455 continue; 456 457 if (!spl_fit_image_get_os(fit, node, &os_type)) 458 debug("Loadable is %s\n", genimg_get_os_name(os_type)); 459 460 if (os_type == IH_OS_U_BOOT) { 461 spl_fit_append_fdt(&image_info, info, sector, 462 fit, images, base_offset); 463 spl_image->fdt_addr = image_info.fdt_addr; 464 } 465 466 /* 467 * If the "firmware" image did not provide an entry point, 468 * use the first valid entry point from the loadables. 469 */ 470 if (spl_image->entry_point == FDT_ERROR && 471 image_info.entry_point != FDT_ERROR) 472 spl_image->entry_point = image_info.entry_point; 473 474 /* Record our loadables into the FDT */ 475 if (spl_image->fdt_addr) 476 spl_fit_record_loadable(fit, images, index, 477 spl_image->fdt_addr, 478 &image_info); 479 } 480 481 /* 482 * If a platform does not provide CONFIG_SYS_UBOOT_START, U-Boot's 483 * Makefile will set it to 0 and it will end up as the entry point 484 * here. What it actually means is: use the load address. 485 */ 486 if (spl_image->entry_point == FDT_ERROR || spl_image->entry_point == 0) 487 spl_image->entry_point = spl_image->load_addr; 488 489 return 0; 490 } 491