PageRenderTime 25ms CodeModel.GetById 24ms RepoModel.GetById 0ms app.codeStats 0ms

/arch/x86/boot/tools/build.c

https://gitlab.com/jhalayashraj/nkernel
C | 266 lines | 175 code | 37 blank | 54 comment | 22 complexity | 094ac55749cabcba7c05e619042c8303 MD5 | raw file
  1. /*
  2. * Copyright (C) 1991, 1992 Linus Torvalds
  3. * Copyright (C) 1997 Martin Mares
  4. * Copyright (C) 2007 H. Peter Anvin
  5. */
  6. /*
  7. * This file builds a disk-image from two different files:
  8. *
  9. * - setup: 8086 machine code, sets up system parm
  10. * - system: 80386 code for actual system
  11. *
  12. * It does some checking that all files are of the correct type, and
  13. * just writes the result to stdout, removing headers and padding to
  14. * the right amount. It also writes some system data to stderr.
  15. */
  16. /*
  17. * Changes by tytso to allow root device specification
  18. * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
  19. * Cross compiling fixes by Gertjan van Wingerde, July 1996
  20. * Rewritten by Martin Mares, April 1997
  21. * Substantially overhauled by H. Peter Anvin, April 2007
  22. */
  23. #include <stdio.h>
  24. #include <string.h>
  25. #include <stdlib.h>
  26. #include <stdarg.h>
  27. #include <sys/types.h>
  28. #include <sys/stat.h>
  29. #include <unistd.h>
  30. #include <fcntl.h>
  31. #include <sys/mman.h>
  32. #include <tools/le_byteshift.h>
  33. typedef unsigned char u8;
  34. typedef unsigned short u16;
  35. typedef unsigned int u32;
  36. #define DEFAULT_MAJOR_ROOT 0
  37. #define DEFAULT_MINOR_ROOT 0
  38. #define DEFAULT_ROOT_DEV (DEFAULT_MAJOR_ROOT << 8 | DEFAULT_MINOR_ROOT)
  39. /* Minimal number of setup sectors */
  40. #define SETUP_SECT_MIN 5
  41. #define SETUP_SECT_MAX 64
  42. /* This must be large enough to hold the entire setup */
  43. u8 buf[SETUP_SECT_MAX*512];
  44. int is_big_kernel;
  45. /*----------------------------------------------------------------------*/
  46. static const u32 crctab32[] = {
  47. 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
  48. 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
  49. 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
  50. 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
  51. 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
  52. 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
  53. 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
  54. 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
  55. 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
  56. 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
  57. 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
  58. 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
  59. 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
  60. 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
  61. 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
  62. 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
  63. 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
  64. 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
  65. 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
  66. 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
  67. 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
  68. 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
  69. 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
  70. 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
  71. 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
  72. 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
  73. 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
  74. 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
  75. 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
  76. 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
  77. 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
  78. 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
  79. 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
  80. 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
  81. 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
  82. 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
  83. 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
  84. 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
  85. 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
  86. 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
  87. 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
  88. 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
  89. 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
  90. 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
  91. 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
  92. 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
  93. 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
  94. 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
  95. 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
  96. 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
  97. 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
  98. 0x2d02ef8d
  99. };
  100. static u32 partial_crc32_one(u8 c, u32 crc)
  101. {
  102. return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8);
  103. }
  104. static u32 partial_crc32(const u8 *s, int len, u32 crc)
  105. {
  106. while (len--)
  107. crc = partial_crc32_one(*s++, crc);
  108. return crc;
  109. }
  110. static void die(const char * str, ...)
  111. {
  112. va_list args;
  113. va_start(args, str);
  114. vfprintf(stderr, str, args);
  115. fputc('\n', stderr);
  116. exit(1);
  117. }
  118. static void usage(void)
  119. {
  120. die("Usage: build setup system [> image]");
  121. }
  122. int main(int argc, char ** argv)
  123. {
  124. #ifdef CONFIG_EFI_STUB
  125. unsigned int file_sz, pe_header;
  126. #endif
  127. unsigned int i, sz, setup_sectors;
  128. int c;
  129. u32 sys_size;
  130. struct stat sb;
  131. FILE *file;
  132. int fd;
  133. void *kernel;
  134. u32 crc = 0xffffffffUL;
  135. if (argc != 3)
  136. usage();
  137. /* Copy the setup code */
  138. file = fopen(argv[1], "r");
  139. if (!file)
  140. die("Unable to open `%s': %m", argv[1]);
  141. c = fread(buf, 1, sizeof(buf), file);
  142. if (ferror(file))
  143. die("read-error on `setup'");
  144. if (c < 1024)
  145. die("The setup must be at least 1024 bytes");
  146. if (get_unaligned_le16(&buf[510]) != 0xAA55)
  147. die("Boot block hasn't got boot flag (0xAA55)");
  148. fclose(file);
  149. /* Pad unused space with zeros */
  150. setup_sectors = (c + 511) / 512;
  151. if (setup_sectors < SETUP_SECT_MIN)
  152. setup_sectors = SETUP_SECT_MIN;
  153. i = setup_sectors*512;
  154. memset(buf+c, 0, i-c);
  155. /* Set the default root device */
  156. put_unaligned_le16(DEFAULT_ROOT_DEV, &buf[508]);
  157. fprintf(stderr, "Setup is %d bytes (padded to %d bytes).\n", c, i);
  158. /* Open and stat the kernel file */
  159. fd = open(argv[2], O_RDONLY);
  160. if (fd < 0)
  161. die("Unable to open `%s': %m", argv[2]);
  162. if (fstat(fd, &sb))
  163. die("Unable to stat `%s': %m", argv[2]);
  164. sz = sb.st_size;
  165. fprintf (stderr, "System is %d kB\n", (sz+1023)/1024);
  166. kernel = mmap(NULL, sz, PROT_READ, MAP_SHARED, fd, 0);
  167. if (kernel == MAP_FAILED)
  168. die("Unable to mmap '%s': %m", argv[2]);
  169. /* Number of 16-byte paragraphs, including space for a 4-byte CRC */
  170. sys_size = (sz + 15 + 4) / 16;
  171. /* Patch the setup code with the appropriate size parameters */
  172. buf[0x1f1] = setup_sectors-1;
  173. put_unaligned_le32(sys_size, &buf[0x1f4]);
  174. #ifdef CONFIG_EFI_STUB
  175. file_sz = sz + i + ((sys_size * 16) - sz);
  176. pe_header = get_unaligned_le32(&buf[0x3c]);
  177. /* Size of code */
  178. put_unaligned_le32(file_sz, &buf[pe_header + 0x1c]);
  179. /* Size of image */
  180. put_unaligned_le32(file_sz, &buf[pe_header + 0x50]);
  181. #ifdef CONFIG_X86_32
  182. /*
  183. * Address of entry point.
  184. *
  185. * The EFI stub entry point is +16 bytes from the start of
  186. * the .text section.
  187. */
  188. put_unaligned_le32(i + 16, &buf[pe_header + 0x28]);
  189. /* .text size */
  190. put_unaligned_le32(file_sz, &buf[pe_header + 0xb0]);
  191. /* .text size of initialised data */
  192. put_unaligned_le32(file_sz, &buf[pe_header + 0xb8]);
  193. #else
  194. /*
  195. * Address of entry point. startup_32 is at the beginning and
  196. * the 64-bit entry point (startup_64) is always 512 bytes
  197. * after. The EFI stub entry point is 16 bytes after that, as
  198. * the first instruction allows legacy loaders to jump over
  199. * the EFI stub initialisation
  200. */
  201. put_unaligned_le32(i + 528, &buf[pe_header + 0x28]);
  202. /* .text size */
  203. put_unaligned_le32(file_sz, &buf[pe_header + 0xc0]);
  204. /* .text size of initialised data */
  205. put_unaligned_le32(file_sz, &buf[pe_header + 0xc8]);
  206. #endif /* CONFIG_X86_32 */
  207. #endif /* CONFIG_EFI_STUB */
  208. crc = partial_crc32(buf, i, crc);
  209. if (fwrite(buf, 1, i, stdout) != i)
  210. die("Writing setup failed");
  211. /* Copy the kernel code */
  212. crc = partial_crc32(kernel, sz, crc);
  213. if (fwrite(kernel, 1, sz, stdout) != sz)
  214. die("Writing kernel failed");
  215. /* Add padding leaving 4 bytes for the checksum */
  216. while (sz++ < (sys_size*16) - 4) {
  217. crc = partial_crc32_one('\0', crc);
  218. if (fwrite("\0", 1, 1, stdout) != 1)
  219. die("Writing padding failed");
  220. }
  221. /* Write the CRC */
  222. fprintf(stderr, "CRC %x\n", crc);
  223. put_unaligned_le32(crc, buf);
  224. if (fwrite(buf, 1, 4, stdout) != 4)
  225. die("Writing CRC failed");
  226. close(fd);
  227. /* Everything is OK */
  228. return 0;
  229. }