tools/pblimage.c

   1 /*
   2  * Copyright 2012 Freescale Semiconductor, Inc.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6 #include "imagetool.h"
   7 #include <image.h>
   8 #include "pblimage.h"
   9
  10 /*
  11  * Initialize to an invalid value.
  12  */
  13 static uint32_t next_pbl_cmd = 0x82000000;
  14 /*
  15  * need to store all bytes in memory for calculating crc32, then write the
  16  * bytes to image file for PBL boot.
  17  */
  18 static unsigned char mem_buf[1000000];
  19 static unsigned char *pmem_buf = mem_buf;
  20 static int pbl_size;
  21 static char *fname = "Unknown";
  22 static int lineno = -1;
  23 static struct pbl_header pblimage_header;
  24
  25 static union
  26 {
  27         char c[4];
  28         unsigned char l;
  29 } endian_test = { {'l', '?', '?', 'b'} };
  30
  31 #define ENDIANNESS ((char)endian_test.l)
  32
  33 /*
  34  * The PBL can load up to 64 bytes at a time, so we split the U-Boot
  35  * image into 64 byte chunks. PBL needs a command for each piece, of
  36  * the form "81xxxxxx", where "xxxxxx" is the offset. Calculate the
  37  * start offset by subtracting the size of the u-boot image from the
  38  * top of the allowable 24-bit range.
  39  */
  40 static void init_next_pbl_cmd(FILE *fp_uboot)
  41 {
  42         struct stat st;
  43         int fd = fileno(fp_uboot);
  44
  45         if (fstat(fd, &st) == -1) {
  46                 printf("Error: Could not determine u-boot image size. %s\n",
  47                         strerror(errno));
  48                 exit(EXIT_FAILURE);
  49         }
  50
  51         next_pbl_cmd = 0x82000000 - st.st_size;
  52 }
  53
  54 static void generate_pbl_cmd(void)
  55 {
  56         uint32_t val = next_pbl_cmd;
  57         next_pbl_cmd += 0x40;
  58         int i;
  59
  60         for (i = 3; i >= 0; i--) {
  61                 *pmem_buf++ = (val >> (i * 8)) & 0xff;
  62                 pbl_size++;
  63         }
  64 }
  65
  66 static void pbl_fget(size_t size, FILE *stream)
  67 {
  68         unsigned char c;
  69         int c_temp;
  70
  71         while (size && (c_temp = fgetc(stream)) != EOF) {
  72                 c = (unsigned char)c_temp;
  73                 *pmem_buf++ = c;
  74                 pbl_size++;
  75                 size--;
  76         }
  77 }
  78
  79 /* load split u-boot with PBI command 81xxxxxx. */
  80 static void load_uboot(FILE *fp_uboot)
  81 {
  82         init_next_pbl_cmd(fp_uboot);
  83         while (next_pbl_cmd < 0x82000000) {
  84                 generate_pbl_cmd();
  85                 pbl_fget(64, fp_uboot);
  86         }
  87 }
  88
  89 static void check_get_hexval(char *token)
  90 {
  91         uint32_t hexval;
  92         int i;
  93
  94         if (!sscanf(token, "%x", &hexval)) {
  95                 printf("Error:%s[%d] - Invalid hex data(%s)\n", fname,
  96                         lineno, token);
  97                 exit(EXIT_FAILURE);
  98         }
  99         for (i = 3; i >= 0; i--) {
 100                 *pmem_buf++ = (hexval >> (i * 8)) & 0xff;
 101                 pbl_size++;
 102         }
 103 }
 104
 105 static void pbl_parser(char *name)
 106 {
 107         FILE *fd = NULL;
 108         char *line = NULL;
 109         char *token, *saveptr1, *saveptr2;
 110         size_t len = 0;
 111
 112         fname = name;
 113         fd = fopen(name, "r");
 114         if (fd == NULL) {
 115                 printf("Error:%s - Can't open\n", fname);
 116                 exit(EXIT_FAILURE);
 117         }
 118
 119         while ((getline(&line, &len, fd)) > 0) {
 120                 lineno++;
 121                 token = strtok_r(line, "\r\n", &saveptr1);
 122                 /* drop all lines with zero tokens (= empty lines) */
 123                 if (token == NULL)
 124                         continue;
 125                 for (line = token;; line = NULL) {
 126                         token = strtok_r(line, " \t", &saveptr2);
 127                         if (token == NULL)
 128                                 break;
 129                         /* Drop all text starting with '#' as comments */
 130                         if (token[0] == '#')
 131                                 break;
 132                         check_get_hexval(token);
 133                 }
 134         }
 135         if (line)
 136                 free(line);
 137         fclose(fd);
 138 }
 139
 140 static uint32_t crc_table[256];
 141
 142 static void make_crc_table(void)
 143 {
 144         uint32_t mask;
 145         int i, j;
 146         uint32_t poly; /* polynomial exclusive-or pattern */
 147
 148         /*
 149          * the polynomial used by PBL is 1 + x1 + x2 + x4 + x5 + x7 + x8 + x10
 150          * + x11 + x12 + x16 + x22 + x23 + x26 + x32.
 151          */
 152         poly = 0x04c11db7;
 153
 154         for (i = 0; i < 256; i++) {
 155                 mask = i << 24;
 156                 for (j = 0; j < 8; j++) {
 157                         if (mask & 0x80000000)
 158                                 mask = (mask << 1) ^ poly;
 159                         else
 160                                 mask <<= 1;
 161                 }
 162                 crc_table[i] = mask;
 163         }
 164 }
 165
 166 unsigned long pbl_crc32(unsigned long crc, const char *buf, uint32_t len)
 167 {
 168         uint32_t crc32_val = 0xffffffff;
 169         uint32_t xor = 0x0;
 170         int i;
 171
 172         make_crc_table();
 173
 174         for (i = 0; i < len; i++)
 175                 crc32_val = (crc32_val << 8) ^
 176                         crc_table[(crc32_val >> 24) ^ (*buf++ & 0xff)];
 177
 178         crc32_val = crc32_val ^ xor;
 179         if (crc32_val < 0) {
 180                 crc32_val += 0xffffffff;
 181                 crc32_val += 1;
 182         }
 183         return crc32_val;
 184 }
 185
 186 static uint32_t reverse_byte(uint32_t val)
 187 {
 188         uint32_t temp;
 189         unsigned char *p1;
 190         int j;
 191
 192         temp = val;
 193         p1 = (unsigned char *)&temp;
 194         for (j = 3; j >= 0; j--)
 195                 *p1++ = (val >> (j * 8)) & 0xff;
 196         return temp;
 197 }
 198
 199 /* write end command and crc command to memory. */
 200 static void add_end_cmd(void)
 201 {
 202         uint32_t pbl_end_cmd[4] = {0x09138000, 0x00000000,
 203                 0x091380c0, 0x00000000};
 204         uint32_t crc32_pbl;
 205         int i;
 206         unsigned char *p = (unsigned char *)&pbl_end_cmd;
 207
 208         if (ENDIANNESS == 'l') {
 209                 for (i = 0; i < 4; i++)
 210                         pbl_end_cmd[i] = reverse_byte(pbl_end_cmd[i]);
 211         }
 212
 213         for (i = 0; i < 16; i++) {
 214                 *pmem_buf++ = *p++;
 215                 pbl_size++;
 216         }
 217
 218         /* Add PBI CRC command. */
 219         *pmem_buf++ = 0x08;
 220         *pmem_buf++ = 0x13;
 221         *pmem_buf++ = 0x80;
 222         *pmem_buf++ = 0x40;
 223         pbl_size += 4;
 224
 225         /* calculated CRC32 and write it to memory. */
 226         crc32_pbl = pbl_crc32(0, (const char *)mem_buf, pbl_size);
 227         *pmem_buf++ = (crc32_pbl >> 24) & 0xff;
 228         *pmem_buf++ = (crc32_pbl >> 16) & 0xff;
 229         *pmem_buf++ = (crc32_pbl >> 8) & 0xff;
 230         *pmem_buf++ = (crc32_pbl) & 0xff;
 231         pbl_size += 4;
 232
 233         if ((pbl_size % 16) != 0) {
 234                 for (i = 0; i < 8; i++) {
 235                         *pmem_buf++ = 0x0;
 236                         pbl_size++;
 237                 }
 238         }
 239         if ((pbl_size % 16 != 0)) {
 240                 printf("Error: Bad size of image file\n");
 241                 exit(EXIT_FAILURE);
 242         }
 243 }
 244
 245 void pbl_load_uboot(int ifd, struct image_tool_params *params)
 246 {
 247         FILE *fp_uboot;
 248         int size;
 249
 250         /* parse the rcw.cfg file. */
 251         pbl_parser(params->imagename);
 252
 253         /* parse the pbi.cfg file. */
 254         pbl_parser(params->imagename2);
 255
 256         fp_uboot = fopen(params->datafile, "r");
 257         if (fp_uboot == NULL) {
 258                 printf("Error: %s open failed\n", params->datafile);
 259                 exit(EXIT_FAILURE);
 260         }
 261
 262         load_uboot(fp_uboot);
 263         add_end_cmd();
 264         fclose(fp_uboot);
 265         lseek(ifd, 0, SEEK_SET);
 266
 267         size = pbl_size;
 268         if (write(ifd, (const void *)&mem_buf, size) != size) {
 269                 fprintf(stderr, "Write error on %s: %s\n",
 270                         params->imagefile, strerror(errno));
 271                 exit(EXIT_FAILURE);
 272         }
 273 }
 274
 275 static int pblimage_check_image_types(uint8_t type)
 276 {
 277         if (type == IH_TYPE_PBLIMAGE)
 278                 return EXIT_SUCCESS;
 279         else
 280                 return EXIT_FAILURE;
 281 }
 282
 283 static int pblimage_verify_header(unsigned char *ptr, int image_size,
 284                         struct image_tool_params *params)
 285 {
 286         struct pbl_header *pbl_hdr = (struct pbl_header *) ptr;
 287
 288         /* Only a few checks can be done: search for magic numbers */
 289         if (ENDIANNESS == 'l') {
 290                 if (pbl_hdr->preamble != reverse_byte(RCW_PREAMBLE))
 291                         return -FDT_ERR_BADSTRUCTURE;
 292
 293                 if (pbl_hdr->rcwheader != reverse_byte(RCW_HEADER))
 294                         return -FDT_ERR_BADSTRUCTURE;
 295         } else {
 296                 if (pbl_hdr->preamble != RCW_PREAMBLE)
 297                         return -FDT_ERR_BADSTRUCTURE;
 298
 299                 if (pbl_hdr->rcwheader != RCW_HEADER)
 300                         return -FDT_ERR_BADSTRUCTURE;
 301         }
 302         return 0;
 303 }
 304
 305 static void pblimage_print_header(const void *ptr)
 306 {
 307         printf("Image Type:   Freescale PBL Boot Image\n");
 308 }
 309
 310 static void pblimage_set_header(void *ptr, struct stat *sbuf, int ifd,
 311                                 struct image_tool_params *params)
 312 {
 313         /*nothing need to do, pbl_load_uboot takes care of whole file. */
 314 }
 315
 316 /* pblimage parameters */
 317 static struct image_type_params pblimage_params = {
 318         .name           = "Freescale PBL Boot Image support",
 319         .header_size    = sizeof(struct pbl_header),
 320         .hdr            = (void *)&pblimage_header,
 321         .check_image_type = pblimage_check_image_types,
 322         .verify_header  = pblimage_verify_header,
 323         .print_header   = pblimage_print_header,
 324         .set_header     = pblimage_set_header,
 325 };
 326
 327 void init_pbl_image_type(void)
 328 {
 329         pbl_size = 0;
 330         register_image_type(&pblimage_params);
 331 }