/* * Copyright (C) 1991, 1992 Linus Torvalds * Copyright (C) 1997 Martin Mares * Copyright (C) 2007 H. Peter Anvin */ /* * This file builds a disk-image from two different files: * * - setup: 8086 machine code, sets up system parm * - system: 80386 code for actual system * * It does some checking that all files are of the correct type, and * just writes the result to stdout, removing headers and padding to * the right amount. It also writes some system data to stderr. */ /* * Changes by tytso to allow root device specification * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996 * Cross compiling fixes by Gertjan van Wingerde, July 1996 * Rewritten by Martin Mares, April 1997 * Substantially overhauled by H. Peter Anvin, April 2007 */ #include #include #include #include #include #include #include #include #include #include typedef unsigned char u8; typedef unsigned short u16; typedef unsigned long u32; #define DEFAULT_MAJOR_ROOT 0 #define DEFAULT_MINOR_ROOT 0 #define DEFAULT_ROOT_DEV (DEFAULT_MAJOR_ROOT << 8 | DEFAULT_MINOR_ROOT) /* Minimal number of setup sectors */ #define SETUP_SECT_MIN 5 #define SETUP_SECT_MAX 64 /* This must be large enough to hold the entire setup */ u8 buf[SETUP_SECT_MAX*512]; int is_big_kernel; /*----------------------------------------------------------------------*/ static const u32 crctab32[] = { 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d }; static u32 partial_crc32_one(u8 c, u32 crc) { return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8); } static u32 partial_crc32(const u8 *s, int len, u32 crc) { while (len--) crc = partial_crc32_one(*s++, crc); return crc; } static void die(const char * str, ...) { va_list args; va_start(args, str); vfprintf(stderr, str, args); fputc('\n', stderr); exit(1); } static void usage(void) { die("Usage: build setup system [> image]"); } int main(int argc, char ** argv) { #ifdef CONFIG_EFI_STUB unsigned int file_sz, pe_header; #endif unsigned int i, sz, setup_sectors; int c; u32 sys_size; struct stat sb; FILE *file; int fd; void *kernel; u32 crc = 0xffffffffUL; if (argc != 3) usage(); /* Copy the setup code */ file = fopen(argv[1], "r"); if (!file) die("Unable to open `%s': %m", argv[1]); c = fread(buf, 1, sizeof(buf), file); if (ferror(file)) die("read-error on `setup'"); if (c < 1024) die("The setup must be at least 1024 bytes"); if (get_unaligned_le16(&buf[510]) != 0xAA55) die("Boot block hasn't got boot flag (0xAA55)"); fclose(file); /* Pad unused space with zeros */ setup_sectors = (c + 511) / 512; if (setup_sectors < SETUP_SECT_MIN) setup_sectors = SETUP_SECT_MIN; i = setup_sectors*512; memset(buf+c, 0, i-c); /* Set the default root device */ put_unaligned_le16(DEFAULT_ROOT_DEV, &buf[508]); fprintf(stderr, "Setup is %d bytes (padded to %d bytes).\n", c, i); /* Open and stat the kernel file */ fd = open(argv[2], O_RDONLY); if (fd < 0) die("Unable to open `%s': %m", argv[2]); if (fstat(fd, &sb)) die("Unable to stat `%s': %m", argv[2]); sz = sb.st_size; fprintf (stderr, "System is %d kB\n", (sz+1023)/1024); kernel = mmap(NULL, sz, PROT_READ, MAP_SHARED, fd, 0); if (kernel == MAP_FAILED) die("Unable to mmap '%s': %m", argv[2]); /* Number of 16-byte paragraphs, including space for a 4-byte CRC */ sys_size = (sz + 15 + 4) / 16; /* Patch the setup code with the appropriate size parameters */ buf[0x1f1] = setup_sectors-1; put_unaligned_le32(sys_size, &buf[0x1f4]); #ifdef CONFIG_EFI_STUB file_sz = sz + i + ((sys_size * 16) - sz); pe_header = get_unaligned_le32(&buf[0x3c]); /* Size of code */ put_unaligned_le32(file_sz, &buf[pe_header + 0x1c]); /* Size of image */ put_unaligned_le32(file_sz, &buf[pe_header + 0x50]); #ifdef CONFIG_X86_32 /* Address of entry point */ put_unaligned_le32(i, &buf[pe_header + 0x28]); /* .text size */ put_unaligned_le32(file_sz, &buf[pe_header + 0xb0]); /* .text size of initialised data */ put_unaligned_le32(file_sz, &buf[pe_header + 0xb8]); #else /* * Address of entry point. startup_32 is at the beginning and * the 64-bit entry point (startup_64) is always 512 bytes * after. */ put_unaligned_le32(i + 512, &buf[pe_header + 0x28]); /* .text size */ put_unaligned_le32(file_sz, &buf[pe_header + 0xc0]); /* .text size of initialised data */ put_unaligned_le32(file_sz, &buf[pe_header + 0xc8]); #endif /* CONFIG_X86_32 */ #endif /* CONFIG_EFI_STUB */ crc = partial_crc32(buf, i, crc); if (fwrite(buf, 1, i, stdout) != i) die("Writing setup failed"); /* Copy the kernel code */ crc = partial_crc32(kernel, sz, crc); if (fwrite(kernel, 1, sz, stdout) != sz) die("Writing kernel failed"); /* Add padding leaving 4 bytes for the checksum */ while (sz++ < (sys_size*16) - 4) { crc = partial_crc32_one('\0', crc); if (fwrite("\0", 1, 1, stdout) != 1) die("Writing padding failed"); } /* Write the CRC */ fprintf(stderr, "CRC %lx\n", crc); if (fwrite(&crc, 1, 4, stdout) != 4) die("Writing CRC failed"); close(fd); /* Everything is OK */ return 0; }