]>
git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - arch/x86/boot/tools/build.c
2 * Copyright (C) 1991, 1992 Linus Torvalds
3 * Copyright (C) 1997 Martin Mares
4 * Copyright (C) 2007 H. Peter Anvin
8 * This file builds a disk-image from two different files:
10 * - setup: 8086 machine code, sets up system parm
11 * - system: 80386 code for actual system
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.
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
23 * Substantially overhauled by H. Peter Anvin, April 2007
30 #include <sys/types.h>
32 #include <sys/sysmacros.h>
38 typedef unsigned char u8
;
39 typedef unsigned short u16
;
40 typedef unsigned long u32
;
42 #define DEFAULT_MAJOR_ROOT 0
43 #define DEFAULT_MINOR_ROOT 0
45 /* Minimal number of setup sectors */
46 #define SETUP_SECT_MIN 5
47 #define SETUP_SECT_MAX 64
49 /* This must be large enough to hold the entire setup */
50 u8 buf
[SETUP_SECT_MAX
*512];
53 /*----------------------------------------------------------------------*/
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,
110 static u32
partial_crc32_one(u8 c
, u32 crc
)
112 return crctab32
[(crc
^ c
) & 0xff] ^ (crc
>> 8);
115 static u32
partial_crc32(const u8
*s
, int len
, u32 crc
)
118 crc
= partial_crc32_one(*s
++, crc
);
122 static void die(const char * str
, ...)
126 vfprintf(stderr
, str
, args
);
131 static void usage(void)
133 die("Usage: build [-b] setup system [rootdev] [> image]");
136 int main(int argc
, char ** argv
)
138 unsigned int i
, sz
, setup_sectors
;
141 u8 major_root
, minor_root
;
146 u32 crc
= 0xffffffffUL
;
148 if (argc
> 2 && !strcmp(argv
[1], "-b"))
153 if ((argc
< 3) || (argc
> 4))
156 if (!strcmp(argv
[3], "CURRENT")) {
157 if (stat("/", &sb
)) {
159 die("Couldn't stat /");
161 major_root
= major(sb
.st_dev
);
162 minor_root
= minor(sb
.st_dev
);
163 } else if (strcmp(argv
[3], "FLOPPY")) {
164 if (stat(argv
[3], &sb
)) {
166 die("Couldn't stat root device.");
168 major_root
= major(sb
.st_rdev
);
169 minor_root
= minor(sb
.st_rdev
);
175 major_root
= DEFAULT_MAJOR_ROOT
;
176 minor_root
= DEFAULT_MINOR_ROOT
;
178 fprintf(stderr
, "Root device is (%d, %d)\n", major_root
, minor_root
);
180 /* Copy the setup code */
181 file
= fopen(argv
[1], "r");
183 die("Unable to open `%s': %m", argv
[1]);
184 c
= fread(buf
, 1, sizeof(buf
), file
);
186 die("read-error on `setup'");
188 die("The setup must be at least 1024 bytes");
189 if (buf
[510] != 0x55 || buf
[511] != 0xaa)
190 die("Boot block hasn't got boot flag (0xAA55)");
193 /* Pad unused space with zeros */
194 setup_sectors
= (c
+ 511) / 512;
195 if (setup_sectors
< SETUP_SECT_MIN
)
196 setup_sectors
= SETUP_SECT_MIN
;
197 i
= setup_sectors
*512;
198 memset(buf
+c
, 0, i
-c
);
200 /* Set the default root device */
201 buf
[508] = minor_root
;
202 buf
[509] = major_root
;
204 fprintf(stderr
, "Setup is %d bytes (padded to %d bytes).\n", c
, i
);
206 /* Open and stat the kernel file */
207 fd
= open(argv
[2], O_RDONLY
);
209 die("Unable to open `%s': %m", argv
[2]);
211 die("Unable to stat `%s': %m", argv
[2]);
213 fprintf (stderr
, "System is %d kB\n", (sz
+1023)/1024);
214 kernel
= mmap(NULL
, sz
, PROT_READ
, MAP_SHARED
, fd
, 0);
215 if (kernel
== MAP_FAILED
)
216 die("Unable to mmap '%s': %m", argv
[2]);
217 /* Number of 16-byte paragraphs, including space for a 4-byte CRC */
218 sys_size
= (sz
+ 15 + 4) / 16;
219 if (!is_big_kernel
&& sys_size
> DEF_SYSSIZE
)
220 die("System is too big. Try using bzImage or modules.");
222 /* Patch the setup code with the appropriate size parameters */
223 buf
[0x1f1] = setup_sectors
-1;
224 buf
[0x1f4] = sys_size
;
225 buf
[0x1f5] = sys_size
>> 8;
226 buf
[0x1f6] = sys_size
>> 16;
227 buf
[0x1f7] = sys_size
>> 24;
229 crc
= partial_crc32(buf
, i
, crc
);
230 if (fwrite(buf
, 1, i
, stdout
) != i
)
231 die("Writing setup failed");
233 /* Copy the kernel code */
234 crc
= partial_crc32(kernel
, sz
, crc
);
235 if (fwrite(kernel
, 1, sz
, stdout
) != sz
)
236 die("Writing kernel failed");
238 /* Add padding leaving 4 bytes for the checksum */
239 while (sz
++ < (sys_size
*16) - 4) {
240 crc
= partial_crc32_one('\0', crc
);
241 if (fwrite("\0", 1, 1, stdout
) != 1)
242 die("Writing padding failed");
246 fprintf(stderr
, "CRC %lx\n", crc
);
247 if (fwrite(&crc
, 1, 4, stdout
) != 4)
248 die("Writing CRC failed");
252 /* Everything is OK */