tools/rkcommon.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2015 Google,  Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  *
   6  * (C) 2017 Theobroma Systems Design und Consulting GmbH
   7  *
   8  * Helper functions for Rockchip images
   9  */
  10
  11 #include "imagetool.h"
  12 #include <image.h>
  13 #include <rc4.h>
  14 #include "mkimage.h"
  15 #include "rkcommon.h"
  16
  17 enum {
  18         RK_SIGNATURE            = 0x0ff0aa55,
  19 };
  20
  21 /**
  22  * struct header0_info - header block for boot ROM
  23  *
  24  * This is stored at SD card block 64 (where each block is 512 bytes, or at
  25  * the start of SPI flash. It is encoded with RC4.
  26  *
  27  * @signature:          Signature (must be RKSD_SIGNATURE)
  28  * @disable_rc4:        0 to use rc4 for boot image,  1 to use plain binary
  29  * @init_offset:        Offset in blocks of the SPL code from this header
  30  *                      block. E.g. 4 means 2KB after the start of this header.
  31  * Other fields are not used by U-Boot
  32  */
  33 struct header0_info {
  34         uint32_t signature;
  35         uint8_t reserved[4];
  36         uint32_t disable_rc4;
  37         uint16_t init_offset;
  38         uint8_t reserved1[492];
  39         uint16_t init_size;
  40         uint16_t init_boot_size;
  41         uint8_t reserved2[2];
  42 };
  43
  44 /**
  45  * struct header1_info
  46  */
  47 struct header1_info {
  48         uint32_t magic;
  49 };
  50
  51 /**
  52  * struct spl_info - spl info for each chip
  53  *
  54  * @imagename:          Image name(passed by "mkimage -n")
  55  * @spl_hdr:            Boot ROM requires a 4-bytes spl header
  56  * @spl_size:           Spl size(include extra 4-bytes spl header)
  57  * @spl_rc4:            RC4 encode the SPL binary (same key as header)
  58  */
  59
  60 struct spl_info {
  61         const char *imagename;
  62         const char *spl_hdr;
  63         const uint32_t spl_size;
  64         const bool spl_rc4;
  65 };
  66
  67 static struct spl_info spl_infos[] = {
  68         { "px30", "RK33", 0x2800, false },
  69         { "rk3036", "RK30", 0x1000, false },
  70         { "rk3128", "RK31", 0x1800, false },
  71         { "rk3188", "RK31", 0x8000 - 0x800, true },
  72         { "rk322x", "RK32", 0x8000 - 0x1000, false },
  73         { "rk3288", "RK32", 0x8000, false },
  74         { "rk3308", "RK33", 0x40000 - 0x1000, false},
  75         { "rk3328", "RK32", 0x8000 - 0x1000, false },
  76         { "rk3368", "RK33", 0x8000 - 0x1000, false },
  77         { "rk3399", "RK33", 0x30000 - 0x2000, false },
  78         { "rv1108", "RK11", 0x1800, false },
  79 };
  80
  81 /**
  82  * struct spl_params - spl params parsed in check_params()
  83  *
  84  * @init_file:          Init data file path
  85  * @init_size:          Aligned size of init data in bytes
  86  * @boot_file:          Boot data file path
  87  * @boot_size:          Aligned size of boot data in bytes
  88  */
  89
  90 struct spl_params {
  91         char *init_file;
  92         uint32_t init_size;
  93         char *boot_file;
  94         uint32_t boot_size;
  95 };
  96
  97 static struct spl_params spl_params = { 0 };
  98
  99 static unsigned char rc4_key[16] = {
 100         124, 78, 3, 4, 85, 5, 9, 7,
 101         45, 44, 123, 56, 23, 13, 23, 17
 102 };
 103
 104 static struct spl_info *rkcommon_get_spl_info(char *imagename)
 105 {
 106         int i;
 107
 108         if (!imagename)
 109                 return NULL;
 110
 111         for (i = 0; i < ARRAY_SIZE(spl_infos); i++)
 112                 if (!strncmp(imagename, spl_infos[i].imagename, 6))
 113                         return spl_infos + i;
 114
 115         return NULL;
 116 }
 117
 118 static int rkcommon_get_aligned_size(struct image_tool_params *params,
 119                                      const char *fname)
 120 {
 121         int size;
 122
 123         size = imagetool_get_filesize(params, fname);
 124         if (size < 0)
 125                 return -1;
 126
 127         /*
 128          * Pad to a 2KB alignment, as required for init/boot size by the ROM
 129          * (see https://lists.denx.de/pipermail/u-boot/2017-May/293268.html)
 130          */
 131         return ROUND(size, RK_SIZE_ALIGN);
 132 }
 133
 134 int rkcommon_check_params(struct image_tool_params *params)
 135 {
 136         int i, size;
 137
 138         /*
 139          * If this is a operation (list or extract), the don't require
 140          * imagename to be set.
 141          */
 142         if (params->lflag || params->iflag)
 143                 return EXIT_SUCCESS;
 144
 145         if (!rkcommon_get_spl_info(params->imagename))
 146                 goto err_spl_info;
 147
 148         spl_params.init_file = params->datafile;
 149
 150         spl_params.boot_file = strchr(spl_params.init_file, ':');
 151         if (spl_params.boot_file) {
 152                 *spl_params.boot_file = '\0';
 153                 spl_params.boot_file += 1;
 154         }
 155
 156         size = rkcommon_get_aligned_size(params, spl_params.init_file);
 157         if (size < 0)
 158                 return EXIT_FAILURE;
 159         spl_params.init_size = size;
 160
 161         /* Boot file is optional, and only for back-to-bootrom functionality. */
 162         if (spl_params.boot_file) {
 163                 size = rkcommon_get_aligned_size(params, spl_params.boot_file);
 164                 if (size < 0)
 165                         return EXIT_FAILURE;
 166                 spl_params.boot_size = size;
 167         }
 168
 169         if (spl_params.init_size > rkcommon_get_spl_size(params)) {
 170                 fprintf(stderr,
 171                         "Error: SPL image is too large (size %#x than %#x)\n",
 172                         spl_params.init_size, rkcommon_get_spl_size(params));
 173                 return EXIT_FAILURE;
 174         }
 175
 176         return EXIT_SUCCESS;
 177
 178 err_spl_info:
 179         fprintf(stderr, "ERROR: imagename (%s) is not supported!\n",
 180                 params->imagename ? params->imagename : "NULL");
 181
 182         fprintf(stderr, "Available imagename:");
 183         for (i = 0; i < ARRAY_SIZE(spl_infos); i++)
 184                 fprintf(stderr, "\t%s", spl_infos[i].imagename);
 185         fprintf(stderr, "\n");
 186
 187         return EXIT_FAILURE;
 188 }
 189
 190 const char *rkcommon_get_spl_hdr(struct image_tool_params *params)
 191 {
 192         struct spl_info *info = rkcommon_get_spl_info(params->imagename);
 193
 194         /*
 195          * info would not be NULL, because of we checked params before.
 196          */
 197         return info->spl_hdr;
 198 }
 199
 200
 201 int rkcommon_get_spl_size(struct image_tool_params *params)
 202 {
 203         struct spl_info *info = rkcommon_get_spl_info(params->imagename);
 204
 205         /*
 206          * info would not be NULL, because of we checked params before.
 207          */
 208         return info->spl_size;
 209 }
 210
 211 bool rkcommon_need_rc4_spl(struct image_tool_params *params)
 212 {
 213         struct spl_info *info = rkcommon_get_spl_info(params->imagename);
 214
 215         /*
 216          * info would not be NULL, because of we checked params before.
 217          */
 218         return info->spl_rc4;
 219 }
 220
 221 static void rkcommon_set_header0(void *buf, struct image_tool_params *params)
 222 {
 223         struct header0_info *hdr = buf;
 224         uint32_t init_boot_size;
 225
 226         memset(buf, '\0', RK_INIT_OFFSET * RK_BLK_SIZE);
 227         hdr->signature   = cpu_to_le32(RK_SIGNATURE);
 228         hdr->disable_rc4 = cpu_to_le32(!rkcommon_need_rc4_spl(params));
 229         hdr->init_offset = cpu_to_le16(RK_INIT_OFFSET);
 230         hdr->init_size   = cpu_to_le16(spl_params.init_size / RK_BLK_SIZE);
 231
 232         /*
 233          * init_boot_size needs to be set, as it is read by the BootROM
 234          * to determine the size of the next-stage bootloader (e.g. U-Boot
 235          * proper), when used with the back-to-bootrom functionality.
 236          *
 237          * see https://lists.denx.de/pipermail/u-boot/2017-May/293267.html
 238          * for a more detailed explanation by Andy Yan
 239          */
 240         if (spl_params.boot_file)
 241                 init_boot_size = spl_params.init_size + spl_params.boot_size;
 242         else
 243                 init_boot_size = spl_params.init_size + RK_MAX_BOOT_SIZE;
 244         hdr->init_boot_size = cpu_to_le16(init_boot_size / RK_BLK_SIZE);
 245
 246         rc4_encode(buf, RK_BLK_SIZE, rc4_key);
 247 }
 248
 249 void rkcommon_set_header(void *buf,  struct stat *sbuf,  int ifd,
 250                          struct image_tool_params *params)
 251 {
 252         struct header1_info *hdr = buf + RK_SPL_HDR_START;
 253
 254         rkcommon_set_header0(buf, params);
 255
 256         /* Set up the SPL name (i.e. copy spl_hdr over) */
 257         memcpy(&hdr->magic, rkcommon_get_spl_hdr(params), RK_SPL_HDR_SIZE);
 258
 259         if (rkcommon_need_rc4_spl(params))
 260                 rkcommon_rc4_encode_spl(buf, RK_SPL_HDR_START,
 261                                         spl_params.init_size);
 262
 263         if (spl_params.boot_file) {
 264                 if (rkcommon_need_rc4_spl(params))
 265                         rkcommon_rc4_encode_spl(buf + RK_SPL_HDR_START,
 266                                                 spl_params.init_size,
 267                                                 spl_params.boot_size);
 268         }
 269 }
 270
 271 static inline unsigned rkcommon_offset_to_spi(unsigned offset)
 272 {
 273         /*
 274          * While SD/MMC images use a flat addressing, SPI images are padded
 275          * to use the first 2K of every 4K sector only.
 276          */
 277         return ((offset & ~0x7ff) << 1) + (offset & 0x7ff);
 278 }
 279
 280 static int rkcommon_parse_header(const void *buf, struct header0_info *header0,
 281                                  struct spl_info **spl_info)
 282 {
 283         unsigned hdr1_offset;
 284         struct header1_info *hdr1_sdmmc, *hdr1_spi;
 285         int i;
 286
 287         if (spl_info)
 288                 *spl_info = NULL;
 289
 290         /*
 291          * The first header (hdr0) is always RC4 encoded, so try to decrypt
 292          * with the well-known key.
 293          */
 294         memcpy((void *)header0, buf, sizeof(struct header0_info));
 295         rc4_encode((void *)header0, sizeof(struct header0_info), rc4_key);
 296
 297         if (le32_to_cpu(header0->signature) != RK_SIGNATURE)
 298                 return -EPROTO;
 299
 300         /* We don't support RC4 encoded image payloads here, yet... */
 301         if (le32_to_cpu(header0->disable_rc4) == 0)
 302                 return -ENOSYS;
 303
 304         hdr1_offset = le16_to_cpu(header0->init_offset) * RK_BLK_SIZE;
 305         hdr1_sdmmc = (struct header1_info *)(buf + hdr1_offset);
 306         hdr1_spi = (struct header1_info *)(buf +
 307                                            rkcommon_offset_to_spi(hdr1_offset));
 308
 309         for (i = 0; i < ARRAY_SIZE(spl_infos); i++) {
 310                 if (!memcmp(&hdr1_sdmmc->magic, spl_infos[i].spl_hdr,
 311                             RK_SPL_HDR_SIZE)) {
 312                         if (spl_info)
 313                                 *spl_info = &spl_infos[i];
 314                         return IH_TYPE_RKSD;
 315                 } else if (!memcmp(&hdr1_spi->magic, spl_infos[i].spl_hdr,
 316                                    RK_SPL_HDR_SIZE)) {
 317                         if (spl_info)
 318                                 *spl_info = &spl_infos[i];
 319                         return IH_TYPE_RKSPI;
 320                 }
 321         }
 322
 323         return -1;
 324 }
 325
 326 int rkcommon_verify_header(unsigned char *buf, int size,
 327                            struct image_tool_params *params)
 328 {
 329         struct header0_info header0;
 330         struct spl_info *img_spl_info, *spl_info;
 331         int ret;
 332
 333         ret = rkcommon_parse_header(buf, &header0, &img_spl_info);
 334
 335         /* If this is the (unimplemented) RC4 case, then rewrite the result */
 336         if (ret == -ENOSYS)
 337                 return 0;
 338
 339         if (ret < 0)
 340                 return ret;
 341
 342         /*
 343          * If no 'imagename' is specified via the commandline (e.g. if this is
 344          * 'dumpimage -l' w/o any further constraints), we accept any spl_info.
 345          */
 346         if (params->imagename == NULL)
 347                 return 0;
 348
 349         /* Match the 'imagename' against the 'spl_hdr' found */
 350         spl_info = rkcommon_get_spl_info(params->imagename);
 351         if (spl_info && img_spl_info)
 352                 return strcmp(spl_info->spl_hdr, img_spl_info->spl_hdr);
 353
 354         return -ENOENT;
 355 }
 356
 357 void rkcommon_print_header(const void *buf)
 358 {
 359         struct header0_info header0;
 360         struct spl_info *spl_info;
 361         uint8_t image_type;
 362         int ret, boot_size, init_size;
 363
 364         ret = rkcommon_parse_header(buf, &header0, &spl_info);
 365
 366         /* If this is the (unimplemented) RC4 case, then fail silently */
 367         if (ret == -ENOSYS)
 368                 return;
 369
 370         if (ret < 0) {
 371                 fprintf(stderr, "Error: image verification failed\n");
 372                 return;
 373         }
 374
 375         image_type = ret;
 376
 377         printf("Image Type:   Rockchip %s (%s) boot image\n",
 378                spl_info->spl_hdr,
 379                (image_type == IH_TYPE_RKSD) ? "SD/MMC" : "SPI");
 380         init_size = le16_to_cpu(header0.init_size) * RK_BLK_SIZE;
 381         printf("Init Data Size: %d bytes\n", init_size);
 382
 383         boot_size = le16_to_cpu(header0.init_boot_size) * RK_BLK_SIZE - init_size;
 384         if (boot_size != RK_MAX_BOOT_SIZE)
 385                 printf("Boot Data Size: %d bytes\n", boot_size);
 386 }
 387
 388 void rkcommon_rc4_encode_spl(void *buf, unsigned int offset, unsigned int size)
 389 {
 390         unsigned int remaining = size;
 391
 392         while (remaining > 0) {
 393                 int step = (remaining > RK_BLK_SIZE) ? RK_BLK_SIZE : remaining;
 394
 395                 rc4_encode(buf + offset, step, rc4_key);
 396                 offset += RK_BLK_SIZE;
 397                 remaining -= step;
 398         }
 399 }
 400
 401 int rkcommon_vrec_header(struct image_tool_params *params,
 402                          struct image_type_params *tparams)
 403 {
 404         /*
 405          * The SPL image looks as follows:
 406          *
 407          * 0x0    header0 (see rkcommon.c)
 408          * 0x800  spl_name ('RK30', ..., 'RK33')
 409          *        (start of the payload for AArch64 payloads: we expect the
 410          *        first 4 bytes to be available for overwriting with our
 411          *        spl_name)
 412          * 0x804  first instruction to be executed
 413          *        (start of the image/payload for 32bit payloads)
 414          *
 415          * For AArch64 (ARMv8) payloads, natural alignment (8-bytes) is
 416          * required for its sections (so the image we receive needs to
 417          * have the first 4 bytes reserved for the spl_name).  Reserving
 418          * these 4 bytes is done using the BOOT0_HOOK infrastructure.
 419          *
 420          * The header is always at 0x800 (as we now use a payload
 421          * prepadded using the boot0 hook for all targets): the first
 422          * 4 bytes of these images can safely be overwritten using the
 423          * boot magic.
 424          */
 425         tparams->header_size = RK_SPL_HDR_START;
 426
 427         /* Allocate, clear and install the header */
 428         tparams->hdr = malloc(tparams->header_size);
 429         if (!tparams->hdr) {
 430                 fprintf(stderr, "%s: Can't alloc header: %s\n",
 431                         params->cmdname, strerror(errno));
 432                 exit(EXIT_FAILURE);
 433         }
 434         memset(tparams->hdr, 0, tparams->header_size);
 435
 436         /*
 437          * We need to store the original file-size (i.e. before padding), as
 438          * imagetool does not set this during its adjustment of file_size.
 439          */
 440         params->orig_file_size = tparams->header_size +
 441                 spl_params.init_size + spl_params.boot_size;
 442
 443         params->file_size = ROUND(params->orig_file_size, RK_SIZE_ALIGN);
 444
 445         /* Ignoring pad len, since we are using our own copy_image() */
 446         return 0;
 447 }
 448
 449 static int pad_file(struct image_tool_params *params, int ifd, int pad)
 450 {
 451         uint8_t zeros[4096];
 452
 453         memset(zeros, 0, sizeof(zeros));
 454
 455         while (pad > 0) {
 456                 int todo = sizeof(zeros);
 457
 458                 if (todo > pad)
 459                         todo = pad;
 460                 if (write(ifd, (char *)&zeros, todo) != todo) {
 461                         fprintf(stderr, "%s: Write error on %s: %s\n",
 462                                 params->cmdname, params->imagefile,
 463                                 strerror(errno));
 464                         return -1;
 465                 }
 466                 pad -= todo;
 467         }
 468
 469         return 0;
 470 }
 471
 472 static int copy_file(struct image_tool_params *params, int ifd,
 473                      const char *file, int padded_size)
 474 {
 475         int dfd;
 476         struct stat sbuf;
 477         unsigned char *ptr;
 478         int size;
 479
 480         if (params->vflag)
 481                 fprintf(stderr, "Adding Image %s\n", file);
 482
 483         dfd = open(file, O_RDONLY | O_BINARY);
 484         if (dfd < 0) {
 485                 fprintf(stderr, "%s: Can't open %s: %s\n",
 486                         params->cmdname, file, strerror(errno));
 487                 return -1;
 488         }
 489
 490         if (fstat(dfd, &sbuf) < 0) {
 491                 fprintf(stderr, "%s: Can't stat %s: %s\n",
 492                         params->cmdname, file, strerror(errno));
 493                 goto err_close;
 494         }
 495
 496         if (params->vflag)
 497                 fprintf(stderr, "Size %u(pad to %u)\n",
 498                         (int)sbuf.st_size, padded_size);
 499
 500         ptr = mmap(0, sbuf.st_size, PROT_READ, MAP_SHARED, dfd, 0);
 501         if (ptr == MAP_FAILED) {
 502                 fprintf(stderr, "%s: Can't read %s: %s\n",
 503                         params->cmdname, file, strerror(errno));
 504                 goto err_munmap;
 505         }
 506
 507         size = sbuf.st_size;
 508         if (write(ifd, ptr, size) != size) {
 509                 fprintf(stderr, "%s: Write error on %s: %s\n",
 510                         params->cmdname, params->imagefile, strerror(errno));
 511                 goto err_munmap;
 512         }
 513
 514         munmap((void *)ptr, sbuf.st_size);
 515         close(dfd);
 516         return pad_file(params, ifd, padded_size - size);
 517
 518 err_munmap:
 519         munmap((void *)ptr, sbuf.st_size);
 520 err_close:
 521         close(dfd);
 522         return -1;
 523 }
 524
 525 int rockchip_copy_image(int ifd, struct image_tool_params *params)
 526 {
 527         int ret;
 528
 529         ret = copy_file(params, ifd, spl_params.init_file,
 530                         spl_params.init_size);
 531         if (ret)
 532                 return ret;
 533
 534         if (spl_params.boot_file) {
 535                 ret = copy_file(params, ifd, spl_params.boot_file,
 536                                 spl_params.boot_size);
 537                 if (ret)
 538                         return ret;
 539         }
 540
 541         return pad_file(params, ifd,
 542                         params->file_size - params->orig_file_size);
 543 }