Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 3 | * Copyright (C) 1997 Martin Mares |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 4 | * Copyright (C) 2007 H. Peter Anvin |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | */ |
| 6 | |
| 7 | /* |
H. Peter Anvin | 9aa3909 | 2007-07-13 16:28:27 -0700 | [diff] [blame] | 8 | * This file builds a disk-image from two different files: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * - setup: 8086 machine code, sets up system parm |
| 11 | * - system: 80386 code for actual system |
| 12 | * |
| 13 | * It does some checking that all files are of the correct type, and |
| 14 | * just writes the result to stdout, removing headers and padding to |
| 15 | * the right amount. It also writes some system data to stderr. |
| 16 | */ |
| 17 | |
| 18 | /* |
| 19 | * Changes by tytso to allow root device specification |
| 20 | * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996 |
| 21 | * Cross compiling fixes by Gertjan van Wingerde, July 1996 |
| 22 | * Rewritten by Martin Mares, April 1997 |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 23 | * Substantially overhauled by H. Peter Anvin, April 2007 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | */ |
| 25 | |
| 26 | #include <stdio.h> |
| 27 | #include <string.h> |
| 28 | #include <stdlib.h> |
| 29 | #include <stdarg.h> |
| 30 | #include <sys/types.h> |
| 31 | #include <sys/stat.h> |
| 32 | #include <sys/sysmacros.h> |
| 33 | #include <unistd.h> |
| 34 | #include <fcntl.h> |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 35 | #include <sys/mman.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <asm/boot.h> |
| 37 | |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 38 | typedef unsigned char u8; |
| 39 | typedef unsigned short u16; |
| 40 | typedef unsigned long u32; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
| 42 | #define DEFAULT_MAJOR_ROOT 0 |
| 43 | #define DEFAULT_MINOR_ROOT 0 |
| 44 | |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 45 | /* Minimal number of setup sectors */ |
| 46 | #define SETUP_SECT_MIN 5 |
| 47 | #define SETUP_SECT_MAX 64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 49 | /* This must be large enough to hold the entire setup */ |
| 50 | u8 buf[SETUP_SECT_MAX*512]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | int is_big_kernel; |
| 52 | |
Ian Campbell | 7d6e737 | 2008-02-17 20:06:35 +0100 | [diff] [blame] | 53 | /*----------------------------------------------------------------------*/ |
| 54 | |
| 55 | static const u32 crctab32[] = { |
| 56 | 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, |
| 57 | 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, |
| 58 | 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, |
| 59 | 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, |
| 60 | 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, |
| 61 | 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, |
| 62 | 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, |
| 63 | 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, |
| 64 | 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, |
| 65 | 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, |
| 66 | 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, |
| 67 | 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, |
| 68 | 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, |
| 69 | 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, |
| 70 | 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, |
| 71 | 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, |
| 72 | 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, |
| 73 | 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, |
| 74 | 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, |
| 75 | 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, |
| 76 | 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, |
| 77 | 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, |
| 78 | 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, |
| 79 | 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, |
| 80 | 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, |
| 81 | 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, |
| 82 | 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, |
| 83 | 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, |
| 84 | 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, |
| 85 | 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, |
| 86 | 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, |
| 87 | 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, |
| 88 | 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, |
| 89 | 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, |
| 90 | 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, |
| 91 | 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, |
| 92 | 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, |
| 93 | 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, |
| 94 | 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, |
| 95 | 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, |
| 96 | 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, |
| 97 | 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, |
| 98 | 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, |
| 99 | 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, |
| 100 | 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, |
| 101 | 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, |
| 102 | 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, |
| 103 | 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, |
| 104 | 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, |
| 105 | 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, |
| 106 | 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, |
| 107 | 0x2d02ef8d |
| 108 | }; |
| 109 | |
| 110 | static u32 partial_crc32_one(u8 c, u32 crc) |
| 111 | { |
| 112 | return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8); |
| 113 | } |
| 114 | |
| 115 | static u32 partial_crc32(const u8 *s, int len, u32 crc) |
| 116 | { |
| 117 | while (len--) |
| 118 | crc = partial_crc32_one(*s++, crc); |
| 119 | return crc; |
| 120 | } |
| 121 | |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 122 | static void die(const char * str, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | { |
| 124 | va_list args; |
| 125 | va_start(args, str); |
| 126 | vfprintf(stderr, str, args); |
| 127 | fputc('\n', stderr); |
| 128 | exit(1); |
| 129 | } |
| 130 | |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 131 | static void usage(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | { |
H. Peter Anvin | 5e47c47 | 2009-03-11 10:55:33 -0700 | [diff] [blame^] | 133 | die("Usage: build setup system [rootdev] [> image]"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | int main(int argc, char ** argv) |
| 137 | { |
KAMBAROV, ZAUR | a8f5034 | 2005-06-28 20:45:06 -0700 | [diff] [blame] | 138 | unsigned int i, sz, setup_sectors; |
| 139 | int c; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | u32 sys_size; |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 141 | u8 major_root, minor_root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | struct stat sb; |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 143 | FILE *file; |
| 144 | int fd; |
| 145 | void *kernel; |
Ian Campbell | 7d6e737 | 2008-02-17 20:06:35 +0100 | [diff] [blame] | 146 | u32 crc = 0xffffffffUL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 148 | if ((argc < 3) || (argc > 4)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | usage(); |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 150 | if (argc > 3) { |
| 151 | if (!strcmp(argv[3], "CURRENT")) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | if (stat("/", &sb)) { |
| 153 | perror("/"); |
| 154 | die("Couldn't stat /"); |
| 155 | } |
| 156 | major_root = major(sb.st_dev); |
| 157 | minor_root = minor(sb.st_dev); |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 158 | } else if (strcmp(argv[3], "FLOPPY")) { |
| 159 | if (stat(argv[3], &sb)) { |
| 160 | perror(argv[3]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | die("Couldn't stat root device."); |
| 162 | } |
| 163 | major_root = major(sb.st_rdev); |
| 164 | minor_root = minor(sb.st_rdev); |
| 165 | } else { |
| 166 | major_root = 0; |
| 167 | minor_root = 0; |
| 168 | } |
| 169 | } else { |
| 170 | major_root = DEFAULT_MAJOR_ROOT; |
| 171 | minor_root = DEFAULT_MINOR_ROOT; |
| 172 | } |
| 173 | fprintf(stderr, "Root device is (%d, %d)\n", major_root, minor_root); |
| 174 | |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 175 | /* Copy the setup code */ |
| 176 | file = fopen(argv[1], "r"); |
| 177 | if (!file) |
| 178 | die("Unable to open `%s': %m", argv[1]); |
| 179 | c = fread(buf, 1, sizeof(buf), file); |
| 180 | if (ferror(file)) |
| 181 | die("read-error on `setup'"); |
| 182 | if (c < 1024) |
| 183 | die("The setup must be at least 1024 bytes"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | if (buf[510] != 0x55 || buf[511] != 0xaa) |
| 185 | die("Boot block hasn't got boot flag (0xAA55)"); |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 186 | fclose(file); |
| 187 | |
| 188 | /* Pad unused space with zeros */ |
| 189 | setup_sectors = (c + 511) / 512; |
| 190 | if (setup_sectors < SETUP_SECT_MIN) |
| 191 | setup_sectors = SETUP_SECT_MIN; |
| 192 | i = setup_sectors*512; |
| 193 | memset(buf+c, 0, i-c); |
| 194 | |
| 195 | /* Set the default root device */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | buf[508] = minor_root; |
| 197 | buf[509] = major_root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 199 | fprintf(stderr, "Setup is %d bytes (padded to %d bytes).\n", c, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 201 | /* Open and stat the kernel file */ |
| 202 | fd = open(argv[2], O_RDONLY); |
| 203 | if (fd < 0) |
| 204 | die("Unable to open `%s': %m", argv[2]); |
| 205 | if (fstat(fd, &sb)) |
| 206 | die("Unable to stat `%s': %m", argv[2]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | sz = sb.st_size; |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 208 | fprintf (stderr, "System is %d kB\n", (sz+1023)/1024); |
| 209 | kernel = mmap(NULL, sz, PROT_READ, MAP_SHARED, fd, 0); |
| 210 | if (kernel == MAP_FAILED) |
| 211 | die("Unable to mmap '%s': %m", argv[2]); |
Ian Campbell | 7d6e737 | 2008-02-17 20:06:35 +0100 | [diff] [blame] | 212 | /* Number of 16-byte paragraphs, including space for a 4-byte CRC */ |
| 213 | sys_size = (sz + 15 + 4) / 16; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 215 | /* Patch the setup code with the appropriate size parameters */ |
| 216 | buf[0x1f1] = setup_sectors-1; |
| 217 | buf[0x1f4] = sys_size; |
| 218 | buf[0x1f5] = sys_size >> 8; |
| 219 | buf[0x1f6] = sys_size >> 16; |
| 220 | buf[0x1f7] = sys_size >> 24; |
| 221 | |
Ian Campbell | 7d6e737 | 2008-02-17 20:06:35 +0100 | [diff] [blame] | 222 | crc = partial_crc32(buf, i, crc); |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 223 | if (fwrite(buf, 1, i, stdout) != i) |
| 224 | die("Writing setup failed"); |
| 225 | |
| 226 | /* Copy the kernel code */ |
Ian Campbell | 7d6e737 | 2008-02-17 20:06:35 +0100 | [diff] [blame] | 227 | crc = partial_crc32(kernel, sz, crc); |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 228 | if (fwrite(kernel, 1, sz, stdout) != sz) |
| 229 | die("Writing kernel failed"); |
Ian Campbell | 7d6e737 | 2008-02-17 20:06:35 +0100 | [diff] [blame] | 230 | |
| 231 | /* Add padding leaving 4 bytes for the checksum */ |
| 232 | while (sz++ < (sys_size*16) - 4) { |
| 233 | crc = partial_crc32_one('\0', crc); |
| 234 | if (fwrite("\0", 1, 1, stdout) != 1) |
| 235 | die("Writing padding failed"); |
| 236 | } |
| 237 | |
| 238 | /* Write the CRC */ |
| 239 | fprintf(stderr, "CRC %lx\n", crc); |
| 240 | if (fwrite(&crc, 1, 4, stdout) != 4) |
| 241 | die("Writing CRC failed"); |
| 242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | close(fd); |
| 244 | |
H. Peter Anvin | 4fd0696 | 2007-07-11 12:18:56 -0700 | [diff] [blame] | 245 | /* Everything is OK */ |
| 246 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | } |