1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Copyright (C) 1991, 1992 Linus Torvalds |
4 | * Copyright (C) 1997 Martin Mares |
5 | * Copyright (C) 2007 H. Peter Anvin |
6 | */ |
7 | |
8 | /* |
9 | * This file builds a disk-image from three different files: |
10 | * |
11 | * - setup: 8086 machine code, sets up system parm |
12 | * - system: 80386 code for actual system |
13 | * - zoffset.h: header with ZO_* defines |
14 | * |
15 | * It does some checking that all files are of the correct type, and writes |
16 | * the result to the specified destination, removing headers and padding to |
17 | * the right amount. It also writes some system data to stdout. |
18 | */ |
19 | |
20 | /* |
21 | * Changes by tytso to allow root device specification |
22 | * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996 |
23 | * Cross compiling fixes by Gertjan van Wingerde, July 1996 |
24 | * Rewritten by Martin Mares, April 1997 |
25 | * Substantially overhauled by H. Peter Anvin, April 2007 |
26 | */ |
27 | |
28 | #include <stdio.h> |
29 | #include <string.h> |
30 | #include <stdlib.h> |
31 | #include <stdarg.h> |
32 | #include <sys/types.h> |
33 | #include <sys/stat.h> |
34 | #include <unistd.h> |
35 | #include <fcntl.h> |
36 | #include <sys/mman.h> |
37 | #include <tools/le_byteshift.h> |
38 | |
39 | typedef unsigned char u8; |
40 | typedef unsigned short u16; |
41 | typedef unsigned int u32; |
42 | |
43 | /* Minimal number of setup sectors */ |
44 | #define SETUP_SECT_MIN 5 |
45 | #define SETUP_SECT_MAX 64 |
46 | |
47 | /* This must be large enough to hold the entire setup */ |
48 | u8 buf[SETUP_SECT_MAX*512]; |
49 | |
50 | static unsigned long _edata; |
51 | |
52 | /*----------------------------------------------------------------------*/ |
53 | |
54 | static const u32 crctab32[] = { |
55 | 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, |
56 | 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, |
57 | 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, |
58 | 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, |
59 | 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, |
60 | 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, |
61 | 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, |
62 | 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, |
63 | 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, |
64 | 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, |
65 | 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, |
66 | 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, |
67 | 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, |
68 | 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, |
69 | 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, |
70 | 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, |
71 | 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, |
72 | 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, |
73 | 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, |
74 | 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, |
75 | 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, |
76 | 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, |
77 | 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, |
78 | 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, |
79 | 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, |
80 | 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, |
81 | 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, |
82 | 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, |
83 | 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, |
84 | 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, |
85 | 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, |
86 | 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, |
87 | 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, |
88 | 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, |
89 | 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, |
90 | 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, |
91 | 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, |
92 | 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, |
93 | 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, |
94 | 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, |
95 | 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, |
96 | 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, |
97 | 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, |
98 | 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, |
99 | 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, |
100 | 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, |
101 | 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, |
102 | 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, |
103 | 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, |
104 | 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, |
105 | 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, |
106 | 0x2d02ef8d |
107 | }; |
108 | |
109 | static u32 partial_crc32_one(u8 c, u32 crc) |
110 | { |
111 | return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8); |
112 | } |
113 | |
114 | static u32 partial_crc32(const u8 *s, int len, u32 crc) |
115 | { |
116 | while (len--) |
117 | crc = partial_crc32_one(c: *s++, crc); |
118 | return crc; |
119 | } |
120 | |
121 | static void die(const char * str, ...) |
122 | { |
123 | va_list args; |
124 | va_start(args, str); |
125 | vfprintf(stderr, format: str, arg: args); |
126 | va_end(args); |
127 | fputc(c: '\n', stderr); |
128 | exit(status: 1); |
129 | } |
130 | |
131 | static void usage(void) |
132 | { |
133 | die(str: "Usage: build setup system zoffset.h image" ); |
134 | } |
135 | |
136 | /* |
137 | * Parse zoffset.h and find the entry points. We could just #include zoffset.h |
138 | * but that would mean tools/build would have to be rebuilt every time. It's |
139 | * not as if parsing it is hard... |
140 | */ |
141 | #define PARSE_ZOFS(p, sym) do { \ |
142 | if (!strncmp(p, "#define ZO_" #sym " ", 11+sizeof(#sym))) \ |
143 | sym = strtoul(p + 11 + sizeof(#sym), NULL, 16); \ |
144 | } while (0) |
145 | |
146 | static void parse_zoffset(char *fname) |
147 | { |
148 | FILE *file; |
149 | char *p; |
150 | int c; |
151 | |
152 | file = fopen(filename: fname, modes: "r" ); |
153 | if (!file) |
154 | die(str: "Unable to open `%s': %m" , fname); |
155 | c = fread(ptr: buf, size: 1, n: sizeof(buf) - 1, stream: file); |
156 | if (ferror(stream: file)) |
157 | die(str: "read-error on `zoffset.h'" ); |
158 | fclose(stream: file); |
159 | buf[c] = 0; |
160 | |
161 | p = (char *)buf; |
162 | |
163 | while (p && *p) { |
164 | PARSE_ZOFS(p, _edata); |
165 | |
166 | p = strchr(s: p, c: '\n'); |
167 | while (p && (*p == '\r' || *p == '\n')) |
168 | p++; |
169 | } |
170 | } |
171 | |
172 | int main(int argc, char ** argv) |
173 | { |
174 | unsigned int i, sz, setup_sectors; |
175 | int c; |
176 | struct stat sb; |
177 | FILE *file, *dest; |
178 | int fd; |
179 | void *kernel; |
180 | u32 crc = 0xffffffffUL; |
181 | |
182 | if (argc != 5) |
183 | usage(); |
184 | parse_zoffset(fname: argv[3]); |
185 | |
186 | dest = fopen(filename: argv[4], modes: "w" ); |
187 | if (!dest) |
188 | die(str: "Unable to write `%s': %m" , argv[4]); |
189 | |
190 | /* Copy the setup code */ |
191 | file = fopen(filename: argv[1], modes: "r" ); |
192 | if (!file) |
193 | die(str: "Unable to open `%s': %m" , argv[1]); |
194 | c = fread(ptr: buf, size: 1, n: sizeof(buf), stream: file); |
195 | if (ferror(stream: file)) |
196 | die(str: "read-error on `setup'" ); |
197 | if (c < 1024) |
198 | die(str: "The setup must be at least 1024 bytes" ); |
199 | if (get_unaligned_le16(p: &buf[510]) != 0xAA55) |
200 | die(str: "Boot block hasn't got boot flag (0xAA55)" ); |
201 | fclose(stream: file); |
202 | |
203 | /* Pad unused space with zeros */ |
204 | setup_sectors = (c + 4095) / 4096; |
205 | setup_sectors *= 8; |
206 | if (setup_sectors < SETUP_SECT_MIN) |
207 | setup_sectors = SETUP_SECT_MIN; |
208 | i = setup_sectors*512; |
209 | memset(s: buf+c, c: 0, n: i-c); |
210 | |
211 | /* Open and stat the kernel file */ |
212 | fd = open(file: argv[2], O_RDONLY); |
213 | if (fd < 0) |
214 | die(str: "Unable to open `%s': %m" , argv[2]); |
215 | if (fstat(fd: fd, buf: &sb)) |
216 | die(str: "Unable to stat `%s': %m" , argv[2]); |
217 | if (_edata != sb.st_size) |
218 | die(str: "Unexpected file size `%s': %u != %u" , argv[2], _edata, |
219 | sb.st_size); |
220 | sz = _edata - 4; |
221 | kernel = mmap(NULL, len: sz, PROT_READ, MAP_SHARED, fd: fd, offset: 0); |
222 | if (kernel == MAP_FAILED) |
223 | die(str: "Unable to mmap '%s': %m" , argv[2]); |
224 | |
225 | crc = partial_crc32(s: buf, len: i, crc); |
226 | if (fwrite(ptr: buf, size: 1, n: i, s: dest) != i) |
227 | die(str: "Writing setup failed" ); |
228 | |
229 | /* Copy the kernel code */ |
230 | crc = partial_crc32(s: kernel, len: sz, crc); |
231 | if (fwrite(ptr: kernel, size: 1, n: sz, s: dest) != sz) |
232 | die(str: "Writing kernel failed" ); |
233 | |
234 | /* Write the CRC */ |
235 | put_unaligned_le32(val: crc, p: buf); |
236 | if (fwrite(ptr: buf, size: 1, n: 4, s: dest) != 4) |
237 | die(str: "Writing CRC failed" ); |
238 | |
239 | /* Catch any delayed write failures */ |
240 | if (fclose(stream: dest)) |
241 | die(str: "Writing image failed" ); |
242 | |
243 | close(fd: fd); |
244 | |
245 | /* Everything is OK */ |
246 | return 0; |
247 | } |
248 | |