1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * dns313-header.c 4 * 5 * Program to add the modified U-Boot header to a binary used with 6 * the D-Link DNS-313 boot loader when booting directly from an 7 * EXT2 formatted hard drive. 8 * 9 * The DNS313 use the same header on zImage, ramdisk, rootfs. 10 * 11 * Written by Linus Walleij <linus.walleij@linaro.org> 12 */ 13 #include <stdlib.h> 14 #include <stdio.h> 15 #include <unistd.h> 16 #include <stdint.h> 17 #include <string.h> 18 #include <sys/types.h> 19 #include <sys/stat.h> 20 #include <fcntl.h> 21 22 /* 23 * This is the U-Boot magic number, so the U-Boot header was used 24 * (obviously) as a template for this custom header. 25 */ 26 #define IH_MAGIC 0x27051956 27 #define HEADER_SIZE 0x68 28 29 #define OFFSET_MAGIC 0x00 30 #define OFFSET_HCRC 0x04 31 #define OFFSET_TIME 0x08 32 #define OFFSET_SIZE 0x0c 33 #define OFFSET_LOAD 0x10 34 #define OFFSET_EP 0x14 35 #define OFFSET_DCRC 0x18 36 #define OFFSET_OS 0x1c 37 #define OFFSET_ARCH 0x1d 38 #define OFFSET_TYPE 0x1e 39 #define OFFSET_COMP 0x1f 40 #define OFFSET_NAME 0x20 41 #define NAME_LEN 0x20 42 #define OFFSET_MODEL 0x40 43 #define MODEL_LEN 0x10 44 #define OFFSET_VERSION 0x50 45 #define VERSION_LEN 0x10 46 #define OFFSET_MAC 0x60 47 #define MAC_LEN 6 48 49 static const uint32_t crc32_table[256] = { 50 0x00000000UL, 0x77073096UL, 0xee0e612cUL, 0x990951baUL, 0x076dc419UL, 51 0x706af48fUL, 0xe963a535UL, 0x9e6495a3UL, 0x0edb8832UL, 0x79dcb8a4UL, 52 0xe0d5e91eUL, 0x97d2d988UL, 0x09b64c2bUL, 0x7eb17cbdUL, 0xe7b82d07UL, 53 0x90bf1d91UL, 0x1db71064UL, 0x6ab020f2UL, 0xf3b97148UL, 0x84be41deUL, 54 0x1adad47dUL, 0x6ddde4ebUL, 0xf4d4b551UL, 0x83d385c7UL, 0x136c9856UL, 55 0x646ba8c0UL, 0xfd62f97aUL, 0x8a65c9ecUL, 0x14015c4fUL, 0x63066cd9UL, 56 0xfa0f3d63UL, 0x8d080df5UL, 0x3b6e20c8UL, 0x4c69105eUL, 0xd56041e4UL, 57 0xa2677172UL, 0x3c03e4d1UL, 0x4b04d447UL, 0xd20d85fdUL, 0xa50ab56bUL, 58 0x35b5a8faUL, 0x42b2986cUL, 0xdbbbc9d6UL, 0xacbcf940UL, 0x32d86ce3UL, 59 0x45df5c75UL, 0xdcd60dcfUL, 0xabd13d59UL, 0x26d930acUL, 0x51de003aUL, 60 0xc8d75180UL, 0xbfd06116UL, 0x21b4f4b5UL, 0x56b3c423UL, 0xcfba9599UL, 61 0xb8bda50fUL, 0x2802b89eUL, 0x5f058808UL, 0xc60cd9b2UL, 0xb10be924UL, 62 0x2f6f7c87UL, 0x58684c11UL, 0xc1611dabUL, 0xb6662d3dUL, 0x76dc4190UL, 63 0x01db7106UL, 0x98d220bcUL, 0xefd5102aUL, 0x71b18589UL, 0x06b6b51fUL, 64 0x9fbfe4a5UL, 0xe8b8d433UL, 0x7807c9a2UL, 0x0f00f934UL, 0x9609a88eUL, 65 0xe10e9818UL, 0x7f6a0dbbUL, 0x086d3d2dUL, 0x91646c97UL, 0xe6635c01UL, 66 0x6b6b51f4UL, 0x1c6c6162UL, 0x856530d8UL, 0xf262004eUL, 0x6c0695edUL, 67 0x1b01a57bUL, 0x8208f4c1UL, 0xf50fc457UL, 0x65b0d9c6UL, 0x12b7e950UL, 68 0x8bbeb8eaUL, 0xfcb9887cUL, 0x62dd1ddfUL, 0x15da2d49UL, 0x8cd37cf3UL, 69 0xfbd44c65UL, 0x4db26158UL, 0x3ab551ceUL, 0xa3bc0074UL, 0xd4bb30e2UL, 70 0x4adfa541UL, 0x3dd895d7UL, 0xa4d1c46dUL, 0xd3d6f4fbUL, 0x4369e96aUL, 71 0x346ed9fcUL, 0xad678846UL, 0xda60b8d0UL, 0x44042d73UL, 0x33031de5UL, 72 0xaa0a4c5fUL, 0xdd0d7cc9UL, 0x5005713cUL, 0x270241aaUL, 0xbe0b1010UL, 73 0xc90c2086UL, 0x5768b525UL, 0x206f85b3UL, 0xb966d409UL, 0xce61e49fUL, 74 0x5edef90eUL, 0x29d9c998UL, 0xb0d09822UL, 0xc7d7a8b4UL, 0x59b33d17UL, 75 0x2eb40d81UL, 0xb7bd5c3bUL, 0xc0ba6cadUL, 0xedb88320UL, 0x9abfb3b6UL, 76 0x03b6e20cUL, 0x74b1d29aUL, 0xead54739UL, 0x9dd277afUL, 0x04db2615UL, 77 0x73dc1683UL, 0xe3630b12UL, 0x94643b84UL, 0x0d6d6a3eUL, 0x7a6a5aa8UL, 78 0xe40ecf0bUL, 0x9309ff9dUL, 0x0a00ae27UL, 0x7d079eb1UL, 0xf00f9344UL, 79 0x8708a3d2UL, 0x1e01f268UL, 0x6906c2feUL, 0xf762575dUL, 0x806567cbUL, 80 0x196c3671UL, 0x6e6b06e7UL, 0xfed41b76UL, 0x89d32be0UL, 0x10da7a5aUL, 81 0x67dd4accUL, 0xf9b9df6fUL, 0x8ebeeff9UL, 0x17b7be43UL, 0x60b08ed5UL, 82 0xd6d6a3e8UL, 0xa1d1937eUL, 0x38d8c2c4UL, 0x4fdff252UL, 0xd1bb67f1UL, 83 0xa6bc5767UL, 0x3fb506ddUL, 0x48b2364bUL, 0xd80d2bdaUL, 0xaf0a1b4cUL, 84 0x36034af6UL, 0x41047a60UL, 0xdf60efc3UL, 0xa867df55UL, 0x316e8eefUL, 85 0x4669be79UL, 0xcb61b38cUL, 0xbc66831aUL, 0x256fd2a0UL, 0x5268e236UL, 86 0xcc0c7795UL, 0xbb0b4703UL, 0x220216b9UL, 0x5505262fUL, 0xc5ba3bbeUL, 87 0xb2bd0b28UL, 0x2bb45a92UL, 0x5cb36a04UL, 0xc2d7ffa7UL, 0xb5d0cf31UL, 88 0x2cd99e8bUL, 0x5bdeae1dUL, 0x9b64c2b0UL, 0xec63f226UL, 0x756aa39cUL, 89 0x026d930aUL, 0x9c0906a9UL, 0xeb0e363fUL, 0x72076785UL, 0x05005713UL, 90 0x95bf4a82UL, 0xe2b87a14UL, 0x7bb12baeUL, 0x0cb61b38UL, 0x92d28e9bUL, 91 0xe5d5be0dUL, 0x7cdcefb7UL, 0x0bdbdf21UL, 0x86d3d2d4UL, 0xf1d4e242UL, 92 0x68ddb3f8UL, 0x1fda836eUL, 0x81be16cdUL, 0xf6b9265bUL, 0x6fb077e1UL, 93 0x18b74777UL, 0x88085ae6UL, 0xff0f6a70UL, 0x66063bcaUL, 0x11010b5cUL, 94 0x8f659effUL, 0xf862ae69UL, 0x616bffd3UL, 0x166ccf45UL, 0xa00ae278UL, 95 0xd70dd2eeUL, 0x4e048354UL, 0x3903b3c2UL, 0xa7672661UL, 0xd06016f7UL, 96 0x4969474dUL, 0x3e6e77dbUL, 0xaed16a4aUL, 0xd9d65adcUL, 0x40df0b66UL, 97 0x37d83bf0UL, 0xa9bcae53UL, 0xdebb9ec5UL, 0x47b2cf7fUL, 0x30b5ffe9UL, 98 0xbdbdf21cUL, 0xcabac28aUL, 0x53b39330UL, 0x24b4a3a6UL, 0xbad03605UL, 99 0xcdd70693UL, 0x54de5729UL, 0x23d967bfUL, 0xb3667a2eUL, 0xc4614ab8UL, 100 0x5d681b02UL, 0x2a6f2b94UL, 0xb40bbe37UL, 0xc30c8ea1UL, 0x5a05df1bUL, 101 0x2d02ef8dUL 102 }; 103 104 static uint32_t crc32(uint32_t crc, 105 const void *data, 106 unsigned int len) 107 { 108 const uint8_t *buf = data; 109 110 crc = crc ^ 0xffffffffUL; 111 do { 112 crc = crc32_table[((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8); 113 } while (--len); 114 return crc ^ 0xffffffffUL; 115 } 116 117 static void be_wr(char *buf, uint32_t val) 118 { 119 buf[0] = (val >> 24) & 0xFFU; 120 buf[1] = (val >> 16) & 0xFFU; 121 buf[2] = (val >> 8) & 0xFFU; 122 buf[3] = val & 0xFFU; 123 } 124 125 int main(int argc, char **argv) 126 { 127 int fdin; 128 int fdout; 129 struct stat sb; 130 uint32_t filesize; 131 int ret = 0; 132 const char *pathin; 133 const char *pathout; 134 char *buffer; 135 uint32_t sum; 136 size_t bufsize; 137 size_t bytes; 138 139 if (argc < 3) { 140 printf("Too few arguments.\n"); 141 printf("%s <infile> <outfile>\n", argv[0]); 142 } 143 144 pathin = argv[1]; 145 pathout = argv[2]; 146 147 ret = stat(pathin, &sb); 148 if (ret < 0) 149 return ret; 150 151 filesize = sb.st_size; 152 printf("INFILE: %s, size: %08x bytes\n", pathin, filesize); 153 /* File + extended header size */ 154 bufsize = filesize + HEADER_SIZE; 155 156 printf("Allocate %08zx bytes\n", bufsize); 157 buffer = malloc(bufsize); 158 if (!buffer) { 159 printf("OOM: could not allocate buffer\n"); 160 return 0; 161 } 162 163 memset(buffer, 0x00, bufsize); 164 165 /* Read file to buffer */ 166 fdin = open(pathin, O_RDONLY); 167 if (!fdin) { 168 printf("ERROR: could not open input file\n"); 169 free(buffer); 170 return 0; 171 } 172 bytes = read(fdin, buffer + HEADER_SIZE, filesize); 173 if (bytes < filesize) { 174 printf("ERROR: could not read entire file\n"); 175 free(buffer); 176 close(fdin); 177 return 0; 178 } 179 close(fdin); 180 181 be_wr(buffer + OFFSET_MAGIC, IH_MAGIC); 182 183 /* FIXME: use actual time */ 184 be_wr(buffer + OFFSET_TIME, 0x4c06738c); 185 be_wr(buffer + OFFSET_SIZE, filesize); 186 187 /* Load address & entry point */ 188 be_wr(buffer + OFFSET_LOAD, 0x00008000); 189 be_wr(buffer + OFFSET_EP, 0x00008000); 190 191 buffer[OFFSET_OS] = 0x05; /* Linux */ 192 buffer[OFFSET_ARCH] = 0x02; /* ARM */ 193 buffer[OFFSET_TYPE] = 0x02; /* OS kernel image */ 194 buffer[OFFSET_COMP] = 0x01; /* gzip */ 195 196 /* The vendor firmware just hardcodes this */ 197 strncpy(buffer + OFFSET_NAME, "kernel.img", NAME_LEN); 198 buffer[OFFSET_NAME + NAME_LEN - 1] = '\0'; 199 strncpy(buffer + OFFSET_MODEL, "dns-313v3", MODEL_LEN); 200 buffer[OFFSET_MODEL + MODEL_LEN - 1] = '\0'; 201 strncpy(buffer + OFFSET_VERSION, "2.01b04", VERSION_LEN); 202 buffer[OFFSET_VERSION + VERSION_LEN - 1] = '\0'; 203 /* Just some MAC address from the example */ 204 buffer[OFFSET_MAC] = 0x00; 205 buffer[OFFSET_MAC + 1] = 0x80; 206 buffer[OFFSET_MAC + 2] = 0xc8; 207 buffer[OFFSET_MAC + 3] = 0x16; 208 buffer[OFFSET_MAC + 4] = 0x81; 209 buffer[OFFSET_MAC + 5] = 0x68; 210 211 /* Checksum payload */ 212 sum = crc32(0, buffer + HEADER_SIZE, filesize); 213 be_wr(buffer + OFFSET_DCRC, sum); 214 printf("data checksum: 0x%08x\n", sum); 215 216 /* Checksum header, then write that into the header checksum */ 217 sum = crc32(0, buffer, HEADER_SIZE); 218 be_wr(buffer + OFFSET_HCRC, sum); 219 printf("header checksum: 0x%08x\n", sum); 220 221 printf("OUTFILE: %s, size: %08zx bytes\n", pathout, bufsize); 222 fdout = open(pathout, O_RDWR|O_CREAT|O_TRUNC,S_IRWXU|S_IRGRP); 223 if (!fdout) { 224 printf("ERROR: could not open output file\n"); 225 return 0; 226 } 227 bytes = write(fdout, buffer, bufsize); 228 if (bytes < bufsize) { 229 printf("ERROR: could not write complete output file\n"); 230 return 0; 231 } 232 close(fdout); 233 234 free(buffer); 235 236 return 0; 237 } 238
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