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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#define DEFAULT_MAJOR_ROOT 0
44#define DEFAULT_MINOR_ROOT 0
45#define DEFAULT_ROOT_DEV (DEFAULT_MAJOR_ROOT << 8 | DEFAULT_MINOR_ROOT)
46
47/* Minimal number of setup sectors */
48#define SETUP_SECT_MIN 5
49#define SETUP_SECT_MAX 64
50
51/* This must be large enough to hold the entire setup */
52u8 buf[SETUP_SECT_MAX*512];
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_fields(char *section_name, u32 vma, u32 size, u32 datasz, u32 offset)
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(vma, section + 0xc);
168
169 /* section header 'size of initialised data' field */
170 put_unaligned_le32(datasz, 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_section_header(char *section_name, u32 offset, u32 size)
183{
184 update_pecoff_section_header_fields(section_name, offset, size, size, offset);
185}
186
187static void update_pecoff_setup_and_reloc(unsigned int size)
188{
189 u32 setup_offset = 0x200;
190 u32 reloc_offset = size - PECOFF_RELOC_RESERVE;
191 u32 setup_size = reloc_offset - setup_offset;
192
193 update_pecoff_section_header(".setup", setup_offset, setup_size);
194 update_pecoff_section_header(".reloc", reloc_offset, PECOFF_RELOC_RESERVE);
195
196 /*
197 * Modify .reloc section contents with a single entry. The
198 * relocation is applied to offset 10 of the relocation section.
199 */
200 put_unaligned_le32(reloc_offset + 10, &buf[reloc_offset]);
201 put_unaligned_le32(10, &buf[reloc_offset + 4]);
202}
203
204static void update_pecoff_text(unsigned int text_start, unsigned int file_sz)
205{
206 unsigned int pe_header;
207 unsigned int text_sz = file_sz - text_start;
208
209 pe_header = get_unaligned_le32(&buf[0x3c]);
210
211 /*
212 * Size of code: Subtract the size of the first sector (512 bytes)
213 * which includes the header.
214 */
215 put_unaligned_le32(file_sz - 512, &buf[pe_header + 0x1c]);
216
217 /*
218 * Address of entry point for PE/COFF executable
219 */
220 put_unaligned_le32(text_start + efi_pe_entry, &buf[pe_header + 0x28]);
221
222 update_pecoff_section_header(".text", text_start, text_sz);
223}
224
225static void update_pecoff_bss(unsigned int file_sz, unsigned int init_sz)
226{
227 unsigned int pe_header;
228 unsigned int bss_sz = init_sz - file_sz;
229
230 pe_header = get_unaligned_le32(&buf[0x3c]);
231
232 /* Size of uninitialized data */
233 put_unaligned_le32(bss_sz, &buf[pe_header + 0x24]);
234
235 /* Size of image */
236 put_unaligned_le32(init_sz, &buf[pe_header + 0x50]);
237
238 update_pecoff_section_header_fields(".bss", file_sz, bss_sz, 0, 0);
239}
240
241static int reserve_pecoff_reloc_section(int c)
242{
243 /* Reserve 0x20 bytes for .reloc section */
244 memset(buf+c, 0, PECOFF_RELOC_RESERVE);
245 return PECOFF_RELOC_RESERVE;
246}
247
248static void efi_stub_defaults(void)
249{
250 /* Defaults for old kernel */
251#ifdef CONFIG_X86_32
252 efi_pe_entry = 0x10;
253#else
254 efi_pe_entry = 0x210;
255 startup_64 = 0x200;
256#endif
257}
258
259static void efi_stub_entry_update(void)
260{
261 unsigned long addr = efi32_stub_entry;
262
263#ifdef CONFIG_X86_64
264 /* Yes, this is really how we defined it :( */
265 addr = efi64_stub_entry - 0x200;
266#endif
267
268#ifdef CONFIG_EFI_MIXED
269 if (efi32_stub_entry != addr)
270 die("32-bit and 64-bit EFI entry points do not match\n");
271#endif
272 put_unaligned_le32(addr, &buf[0x264]);
273}
274
275#else
276
277static inline void update_pecoff_setup_and_reloc(unsigned int size) {}
278static inline void update_pecoff_text(unsigned int text_start,
279 unsigned int file_sz) {}
280static inline void update_pecoff_bss(unsigned int file_sz,
281 unsigned int init_sz) {}
282static inline void efi_stub_defaults(void) {}
283static inline void efi_stub_entry_update(void) {}
284
285static inline int reserve_pecoff_reloc_section(int c)
286{
287 return 0;
288}
289#endif /* CONFIG_EFI_STUB */
290
291
292/*
293 * Parse zoffset.h and find the entry points. We could just #include zoffset.h
294 * but that would mean tools/build would have to be rebuilt every time. It's
295 * not as if parsing it is hard...
296 */
297#define PARSE_ZOFS(p, sym) do { \
298 if (!strncmp(p, "#define ZO_" #sym " ", 11+sizeof(#sym))) \
299 sym = strtoul(p + 11 + sizeof(#sym), NULL, 16); \
300} while (0)
301
302static void parse_zoffset(char *fname)
303{
304 FILE *file;
305 char *p;
306 int c;
307
308 file = fopen(fname, "r");
309 if (!file)
310 die("Unable to open `%s': %m", fname);
311 c = fread(buf, 1, sizeof(buf) - 1, file);
312 if (ferror(file))
313 die("read-error on `zoffset.h'");
314 fclose(file);
315 buf[c] = 0;
316
317 p = (char *)buf;
318
319 while (p && *p) {
320 PARSE_ZOFS(p, efi32_stub_entry);
321 PARSE_ZOFS(p, efi64_stub_entry);
322 PARSE_ZOFS(p, efi_pe_entry);
323 PARSE_ZOFS(p, startup_64);
324
325 p = strchr(p, '\n');
326 while (p && (*p == '\r' || *p == '\n'))
327 p++;
328 }
329}
330
331int main(int argc, char ** argv)
332{
333 unsigned int i, sz, setup_sectors, init_sz;
334 int c;
335 u32 sys_size;
336 struct stat sb;
337 FILE *file, *dest;
338 int fd;
339 void *kernel;
340 u32 crc = 0xffffffffUL;
341
342 efi_stub_defaults();
343
344 if (argc != 5)
345 usage();
346 parse_zoffset(argv[3]);
347
348 dest = fopen(argv[4], "w");
349 if (!dest)
350 die("Unable to write `%s': %m", argv[4]);
351
352 /* Copy the setup code */
353 file = fopen(argv[1], "r");
354 if (!file)
355 die("Unable to open `%s': %m", argv[1]);
356 c = fread(buf, 1, sizeof(buf), file);
357 if (ferror(file))
358 die("read-error on `setup'");
359 if (c < 1024)
360 die("The setup must be at least 1024 bytes");
361 if (get_unaligned_le16(&buf[510]) != 0xAA55)
362 die("Boot block hasn't got boot flag (0xAA55)");
363 fclose(file);
364
365 c += reserve_pecoff_reloc_section(c);
366
367 /* Pad unused space with zeros */
368 setup_sectors = (c + 511) / 512;
369 if (setup_sectors < SETUP_SECT_MIN)
370 setup_sectors = SETUP_SECT_MIN;
371 i = setup_sectors*512;
372 memset(buf+c, 0, i-c);
373
374 update_pecoff_setup_and_reloc(i);
375
376 /* Set the default root device */
377 put_unaligned_le16(DEFAULT_ROOT_DEV, &buf[508]);
378
379 printf("Setup is %d bytes (padded to %d bytes).\n", c, i);
380
381 /* Open and stat the kernel file */
382 fd = open(argv[2], O_RDONLY);
383 if (fd < 0)
384 die("Unable to open `%s': %m", argv[2]);
385 if (fstat(fd, &sb))
386 die("Unable to stat `%s': %m", argv[2]);
387 sz = sb.st_size;
388 printf("System is %d kB\n", (sz+1023)/1024);
389 kernel = mmap(NULL, sz, PROT_READ, MAP_SHARED, fd, 0);
390 if (kernel == MAP_FAILED)
391 die("Unable to mmap '%s': %m", argv[2]);
392 /* Number of 16-byte paragraphs, including space for a 4-byte CRC */
393 sys_size = (sz + 15 + 4) / 16;
394
395 /* Patch the setup code with the appropriate size parameters */
396 buf[0x1f1] = setup_sectors-1;
397 put_unaligned_le32(sys_size, &buf[0x1f4]);
398
399 update_pecoff_text(setup_sectors * 512, i + (sys_size * 16));
400 init_sz = get_unaligned_le32(&buf[0x260]);
401 update_pecoff_bss(i + (sys_size * 16), init_sz);
402
403 efi_stub_entry_update();
404
405 crc = partial_crc32(buf, i, crc);
406 if (fwrite(buf, 1, i, dest) != i)
407 die("Writing setup failed");
408
409 /* Copy the kernel code */
410 crc = partial_crc32(kernel, sz, crc);
411 if (fwrite(kernel, 1, sz, dest) != sz)
412 die("Writing kernel failed");
413
414 /* Add padding leaving 4 bytes for the checksum */
415 while (sz++ < (sys_size*16) - 4) {
416 crc = partial_crc32_one('\0', crc);
417 if (fwrite("\0", 1, 1, dest) != 1)
418 die("Writing padding failed");
419 }
420
421 /* Write the CRC */
422 printf("CRC %x\n", crc);
423 put_unaligned_le32(crc, buf);
424 if (fwrite(buf, 1, 4, dest) != 4)
425 die("Writing CRC failed");
426
427 /* Catch any delayed write failures */
428 if (fclose(dest))
429 die("Writing image failed");
430
431 close(fd);
432
433 /* Everything is OK */
434 return 0;
435}