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1/*
2 * Copyright (C) 1991, 1992 Linus Torvalds
3 * Copyright (C) 1997 Martin Mares
4 * Copyright (C) 2007 H. Peter Anvin
5 */
6
7/*
8 * This file builds a disk-image from three different files:
9 *
10 * - setup: 8086 machine code, sets up system parm
11 * - system: 80386 code for actual system
12 * - zoffset.h: header with ZO_* defines
13 *
14 * It does some checking that all files are of the correct type, and writes
15 * the result to the specified destination, removing headers and padding to
16 * the right amount. It also writes some system data to stdout.
17 */
18
19/*
20 * Changes by tytso to allow root device specification
21 * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
22 * Cross compiling fixes by Gertjan van Wingerde, July 1996
23 * Rewritten by Martin Mares, April 1997
24 * Substantially overhauled by H. Peter Anvin, April 2007
25 */
26
27#include <stdio.h>
28#include <string.h>
29#include <stdlib.h>
30#include <stdarg.h>
31#include <sys/types.h>
32#include <sys/stat.h>
33#include <unistd.h>
34#include <fcntl.h>
35#include <sys/mman.h>
36#include <tools/le_byteshift.h>
37
38typedef unsigned char u8;
39typedef unsigned short u16;
40typedef unsigned int u32;
41
42#define DEFAULT_MAJOR_ROOT 0
43#define DEFAULT_MINOR_ROOT 0
44#define DEFAULT_ROOT_DEV (DEFAULT_MAJOR_ROOT << 8 | DEFAULT_MINOR_ROOT)
45
46/* Minimal number of setup sectors */
47#define SETUP_SECT_MIN 5
48#define SETUP_SECT_MAX 64
49
50/* This must be large enough to hold the entire setup */
51u8 buf[SETUP_SECT_MAX*512];
52int is_big_kernel;
53
54#define PECOFF_RELOC_RESERVE 0x20
55
56unsigned long efi32_stub_entry;
57unsigned long efi64_stub_entry;
58unsigned long efi_pe_entry;
59unsigned long startup_64;
60
61/*----------------------------------------------------------------------*/
62
63static const u32 crctab32[] = {
64 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
65 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
66 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
67 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
68 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
69 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
70 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
71 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
72 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
73 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
74 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
75 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
76 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
77 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
78 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
79 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
80 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
81 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
82 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
83 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
84 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
85 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
86 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
87 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
88 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
89 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
90 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
91 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
92 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
93 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
94 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
95 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
96 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
97 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
98 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
99 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
100 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
101 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
102 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
103 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
104 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
105 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
106 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
107 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
108 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
109 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
110 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
111 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
112 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
113 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
114 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
115 0x2d02ef8d
116};
117
118static u32 partial_crc32_one(u8 c, u32 crc)
119{
120 return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8);
121}
122
123static u32 partial_crc32(const u8 *s, int len, u32 crc)
124{
125 while (len--)
126 crc = partial_crc32_one(*s++, crc);
127 return crc;
128}
129
130static void die(const char * str, ...)
131{
132 va_list args;
133 va_start(args, str);
134 vfprintf(stderr, str, args);
135 fputc('\n', stderr);
136 exit(1);
137}
138
139static void usage(void)
140{
141 die("Usage: build setup system zoffset.h image");
142}
143
144#ifdef CONFIG_EFI_STUB
145
146static void update_pecoff_section_header(char *section_name, u32 offset, u32 size)
147{
148 unsigned int pe_header;
149 unsigned short num_sections;
150 u8 *section;
151
152 pe_header = get_unaligned_le32(&buf[0x3c]);
153 num_sections = get_unaligned_le16(&buf[pe_header + 6]);
154
155#ifdef CONFIG_X86_32
156 section = &buf[pe_header + 0xa8];
157#else
158 section = &buf[pe_header + 0xb8];
159#endif
160
161 while (num_sections > 0) {
162 if (strncmp((char*)section, section_name, 8) == 0) {
163 /* section header size field */
164 put_unaligned_le32(size, section + 0x8);
165
166 /* section header vma field */
167 put_unaligned_le32(offset, section + 0xc);
168
169 /* section header 'size of initialised data' field */
170 put_unaligned_le32(size, section + 0x10);
171
172 /* section header 'file offset' field */
173 put_unaligned_le32(offset, section + 0x14);
174
175 break;
176 }
177 section += 0x28;
178 num_sections--;
179 }
180}
181
182static void update_pecoff_setup_and_reloc(unsigned int size)
183{
184 u32 setup_offset = 0x200;
185 u32 reloc_offset = size - PECOFF_RELOC_RESERVE;
186 u32 setup_size = reloc_offset - setup_offset;
187
188 update_pecoff_section_header(".setup", setup_offset, setup_size);
189 update_pecoff_section_header(".reloc", reloc_offset, PECOFF_RELOC_RESERVE);
190
191 /*
192 * Modify .reloc section contents with a single entry. The
193 * relocation is applied to offset 10 of the relocation section.
194 */
195 put_unaligned_le32(reloc_offset + 10, &buf[reloc_offset]);
196 put_unaligned_le32(10, &buf[reloc_offset + 4]);
197}
198
199static void update_pecoff_text(unsigned int text_start, unsigned int file_sz)
200{
201 unsigned int pe_header;
202 unsigned int text_sz = file_sz - text_start;
203
204 pe_header = get_unaligned_le32(&buf[0x3c]);
205
206 /* Size of image */
207 put_unaligned_le32(file_sz, &buf[pe_header + 0x50]);
208
209 /*
210 * Size of code: Subtract the size of the first sector (512 bytes)
211 * which includes the header.
212 */
213 put_unaligned_le32(file_sz - 512, &buf[pe_header + 0x1c]);
214
215 /*
216 * Address of entry point for PE/COFF executable
217 */
218 put_unaligned_le32(text_start + efi_pe_entry, &buf[pe_header + 0x28]);
219
220 update_pecoff_section_header(".text", text_start, text_sz);
221}
222
223static int reserve_pecoff_reloc_section(int c)
224{
225 /* Reserve 0x20 bytes for .reloc section */
226 memset(buf+c, 0, PECOFF_RELOC_RESERVE);
227 return PECOFF_RELOC_RESERVE;
228}
229
230static void efi_stub_defaults(void)
231{
232 /* Defaults for old kernel */
233#ifdef CONFIG_X86_32
234 efi_pe_entry = 0x10;
235#else
236 efi_pe_entry = 0x210;
237 startup_64 = 0x200;
238#endif
239}
240
241static void efi_stub_entry_update(void)
242{
243 unsigned long addr = efi32_stub_entry;
244
245#ifdef CONFIG_X86_64
246 /* Yes, this is really how we defined it :( */
247 addr = efi64_stub_entry - 0x200;
248#endif
249
250#ifdef CONFIG_EFI_MIXED
251 if (efi32_stub_entry != addr)
252 die("32-bit and 64-bit EFI entry points do not match\n");
253#endif
254 put_unaligned_le32(addr, &buf[0x264]);
255}
256
257#else
258
259static inline void update_pecoff_setup_and_reloc(unsigned int size) {}
260static inline void update_pecoff_text(unsigned int text_start,
261 unsigned int file_sz) {}
262static inline void efi_stub_defaults(void) {}
263static inline void efi_stub_entry_update(void) {}
264
265static inline int reserve_pecoff_reloc_section(int c)
266{
267 return 0;
268}
269#endif /* CONFIG_EFI_STUB */
270
271
272/*
273 * Parse zoffset.h and find the entry points. We could just #include zoffset.h
274 * but that would mean tools/build would have to be rebuilt every time. It's
275 * not as if parsing it is hard...
276 */
277#define PARSE_ZOFS(p, sym) do { \
278 if (!strncmp(p, "#define ZO_" #sym " ", 11+sizeof(#sym))) \
279 sym = strtoul(p + 11 + sizeof(#sym), NULL, 16); \
280} while (0)
281
282static void parse_zoffset(char *fname)
283{
284 FILE *file;
285 char *p;
286 int c;
287
288 file = fopen(fname, "r");
289 if (!file)
290 die("Unable to open `%s': %m", fname);
291 c = fread(buf, 1, sizeof(buf) - 1, file);
292 if (ferror(file))
293 die("read-error on `zoffset.h'");
294 fclose(file);
295 buf[c] = 0;
296
297 p = (char *)buf;
298
299 while (p && *p) {
300 PARSE_ZOFS(p, efi32_stub_entry);
301 PARSE_ZOFS(p, efi64_stub_entry);
302 PARSE_ZOFS(p, efi_pe_entry);
303 PARSE_ZOFS(p, startup_64);
304
305 p = strchr(p, '\n');
306 while (p && (*p == '\r' || *p == '\n'))
307 p++;
308 }
309}
310
311int main(int argc, char ** argv)
312{
313 unsigned int i, sz, setup_sectors;
314 int c;
315 u32 sys_size;
316 struct stat sb;
317 FILE *file, *dest;
318 int fd;
319 void *kernel;
320 u32 crc = 0xffffffffUL;
321
322 efi_stub_defaults();
323
324 if (argc != 5)
325 usage();
326 parse_zoffset(argv[3]);
327
328 dest = fopen(argv[4], "w");
329 if (!dest)
330 die("Unable to write `%s': %m", argv[4]);
331
332 /* Copy the setup code */
333 file = fopen(argv[1], "r");
334 if (!file)
335 die("Unable to open `%s': %m", argv[1]);
336 c = fread(buf, 1, sizeof(buf), file);
337 if (ferror(file))
338 die("read-error on `setup'");
339 if (c < 1024)
340 die("The setup must be at least 1024 bytes");
341 if (get_unaligned_le16(&buf[510]) != 0xAA55)
342 die("Boot block hasn't got boot flag (0xAA55)");
343 fclose(file);
344
345 c += reserve_pecoff_reloc_section(c);
346
347 /* Pad unused space with zeros */
348 setup_sectors = (c + 511) / 512;
349 if (setup_sectors < SETUP_SECT_MIN)
350 setup_sectors = SETUP_SECT_MIN;
351 i = setup_sectors*512;
352 memset(buf+c, 0, i-c);
353
354 update_pecoff_setup_and_reloc(i);
355
356 /* Set the default root device */
357 put_unaligned_le16(DEFAULT_ROOT_DEV, &buf[508]);
358
359 printf("Setup is %d bytes (padded to %d bytes).\n", c, i);
360
361 /* Open and stat the kernel file */
362 fd = open(argv[2], O_RDONLY);
363 if (fd < 0)
364 die("Unable to open `%s': %m", argv[2]);
365 if (fstat(fd, &sb))
366 die("Unable to stat `%s': %m", argv[2]);
367 sz = sb.st_size;
368 printf("System is %d kB\n", (sz+1023)/1024);
369 kernel = mmap(NULL, sz, PROT_READ, MAP_SHARED, fd, 0);
370 if (kernel == MAP_FAILED)
371 die("Unable to mmap '%s': %m", argv[2]);
372 /* Number of 16-byte paragraphs, including space for a 4-byte CRC */
373 sys_size = (sz + 15 + 4) / 16;
374
375 /* Patch the setup code with the appropriate size parameters */
376 buf[0x1f1] = setup_sectors-1;
377 put_unaligned_le32(sys_size, &buf[0x1f4]);
378
379 update_pecoff_text(setup_sectors * 512, sz + i + ((sys_size * 16) - sz));
380
381 efi_stub_entry_update();
382
383 crc = partial_crc32(buf, i, crc);
384 if (fwrite(buf, 1, i, dest) != i)
385 die("Writing setup failed");
386
387 /* Copy the kernel code */
388 crc = partial_crc32(kernel, sz, crc);
389 if (fwrite(kernel, 1, sz, dest) != sz)
390 die("Writing kernel failed");
391
392 /* Add padding leaving 4 bytes for the checksum */
393 while (sz++ < (sys_size*16) - 4) {
394 crc = partial_crc32_one('\0', crc);
395 if (fwrite("\0", 1, 1, dest) != 1)
396 die("Writing padding failed");
397 }
398
399 /* Write the CRC */
400 printf("CRC %x\n", crc);
401 put_unaligned_le32(crc, buf);
402 if (fwrite(buf, 1, 4, dest) != 4)
403 die("Writing CRC failed");
404
405 /* Catch any delayed write failures */
406 if (fclose(dest))
407 die("Writing image failed");
408
409 close(fd);
410
411 /* Everything is OK */
412 return 0;
413}
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
39typedef unsigned char u8;
40typedef unsigned short u16;
41typedef 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 */
48u8 buf[SETUP_SECT_MAX*512];
49
50static unsigned long _edata;
51
52/*----------------------------------------------------------------------*/
53
54static 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
109static u32 partial_crc32_one(u8 c, u32 crc)
110{
111 return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8);
112}
113
114static u32 partial_crc32(const u8 *s, int len, u32 crc)
115{
116 while (len--)
117 crc = partial_crc32_one(*s++, crc);
118 return crc;
119}
120
121static void die(const char * str, ...)
122{
123 va_list args;
124 va_start(args, str);
125 vfprintf(stderr, str, args);
126 va_end(args);
127 fputc('\n', stderr);
128 exit(1);
129}
130
131static void usage(void)
132{
133 die("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
146static void parse_zoffset(char *fname)
147{
148 FILE *file;
149 char *p;
150 int c;
151
152 file = fopen(fname, "r");
153 if (!file)
154 die("Unable to open `%s': %m", fname);
155 c = fread(buf, 1, sizeof(buf) - 1, file);
156 if (ferror(file))
157 die("read-error on `zoffset.h'");
158 fclose(file);
159 buf[c] = 0;
160
161 p = (char *)buf;
162
163 while (p && *p) {
164 PARSE_ZOFS(p, _edata);
165
166 p = strchr(p, '\n');
167 while (p && (*p == '\r' || *p == '\n'))
168 p++;
169 }
170}
171
172int 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(argv[3]);
185
186 dest = fopen(argv[4], "w");
187 if (!dest)
188 die("Unable to write `%s': %m", argv[4]);
189
190 /* Copy the setup code */
191 file = fopen(argv[1], "r");
192 if (!file)
193 die("Unable to open `%s': %m", argv[1]);
194 c = fread(buf, 1, sizeof(buf), file);
195 if (ferror(file))
196 die("read-error on `setup'");
197 if (c < 1024)
198 die("The setup must be at least 1024 bytes");
199 if (get_unaligned_le16(&buf[510]) != 0xAA55)
200 die("Boot block hasn't got boot flag (0xAA55)");
201 fclose(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(buf+c, 0, i-c);
210
211 /* Open and stat the kernel file */
212 fd = open(argv[2], O_RDONLY);
213 if (fd < 0)
214 die("Unable to open `%s': %m", argv[2]);
215 if (fstat(fd, &sb))
216 die("Unable to stat `%s': %m", argv[2]);
217 if (_edata != sb.st_size)
218 die("Unexpected file size `%s': %u != %u", argv[2], _edata,
219 sb.st_size);
220 sz = _edata - 4;
221 kernel = mmap(NULL, sz, PROT_READ, MAP_SHARED, fd, 0);
222 if (kernel == MAP_FAILED)
223 die("Unable to mmap '%s': %m", argv[2]);
224
225 crc = partial_crc32(buf, i, crc);
226 if (fwrite(buf, 1, i, dest) != i)
227 die("Writing setup failed");
228
229 /* Copy the kernel code */
230 crc = partial_crc32(kernel, sz, crc);
231 if (fwrite(kernel, 1, sz, dest) != sz)
232 die("Writing kernel failed");
233
234 /* Write the CRC */
235 put_unaligned_le32(crc, buf);
236 if (fwrite(buf, 1, 4, dest) != 4)
237 die("Writing CRC failed");
238
239 /* Catch any delayed write failures */
240 if (fclose(dest))
241 die("Writing image failed");
242
243 close(fd);
244
245 /* Everything is OK */
246 return 0;
247}