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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];
52
53#define PECOFF_RELOC_RESERVE 0x20
54
55unsigned long efi32_stub_entry;
56unsigned long efi64_stub_entry;
57unsigned long efi_pe_entry;
58unsigned long startup_64;
59
60/*----------------------------------------------------------------------*/
61
62static const u32 crctab32[] = {
63 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
64 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
65 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
66 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
67 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
68 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
69 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
70 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
71 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
72 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
73 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
74 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
75 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
76 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
77 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
78 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
79 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
80 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
81 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
82 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
83 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
84 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
85 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
86 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
87 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
88 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
89 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
90 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
91 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
92 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
93 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
94 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
95 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
96 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
97 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
98 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
99 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
100 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
101 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
102 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
103 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
104 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
105 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
106 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
107 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
108 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
109 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
110 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
111 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
112 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
113 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
114 0x2d02ef8d
115};
116
117static u32 partial_crc32_one(u8 c, u32 crc)
118{
119 return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8);
120}
121
122static u32 partial_crc32(const u8 *s, int len, u32 crc)
123{
124 while (len--)
125 crc = partial_crc32_one(*s++, crc);
126 return crc;
127}
128
129static void die(const char * str, ...)
130{
131 va_list args;
132 va_start(args, str);
133 vfprintf(stderr, str, args);
134 fputc('\n', stderr);
135 exit(1);
136}
137
138static void usage(void)
139{
140 die("Usage: build setup system zoffset.h image");
141}
142
143#ifdef CONFIG_EFI_STUB
144
145static void update_pecoff_section_header_fields(char *section_name, u32 vma, u32 size, u32 datasz, u32 offset)
146{
147 unsigned int pe_header;
148 unsigned short num_sections;
149 u8 *section;
150
151 pe_header = get_unaligned_le32(&buf[0x3c]);
152 num_sections = get_unaligned_le16(&buf[pe_header + 6]);
153
154#ifdef CONFIG_X86_32
155 section = &buf[pe_header + 0xa8];
156#else
157 section = &buf[pe_header + 0xb8];
158#endif
159
160 while (num_sections > 0) {
161 if (strncmp((char*)section, section_name, 8) == 0) {
162 /* section header size field */
163 put_unaligned_le32(size, section + 0x8);
164
165 /* section header vma field */
166 put_unaligned_le32(vma, section + 0xc);
167
168 /* section header 'size of initialised data' field */
169 put_unaligned_le32(datasz, section + 0x10);
170
171 /* section header 'file offset' field */
172 put_unaligned_le32(offset, section + 0x14);
173
174 break;
175 }
176 section += 0x28;
177 num_sections--;
178 }
179}
180
181static void update_pecoff_section_header(char *section_name, u32 offset, u32 size)
182{
183 update_pecoff_section_header_fields(section_name, offset, size, size, offset);
184}
185
186static void update_pecoff_setup_and_reloc(unsigned int size)
187{
188 u32 setup_offset = 0x200;
189 u32 reloc_offset = size - PECOFF_RELOC_RESERVE;
190 u32 setup_size = reloc_offset - setup_offset;
191
192 update_pecoff_section_header(".setup", setup_offset, setup_size);
193 update_pecoff_section_header(".reloc", reloc_offset, PECOFF_RELOC_RESERVE);
194
195 /*
196 * Modify .reloc section contents with a single entry. The
197 * relocation is applied to offset 10 of the relocation section.
198 */
199 put_unaligned_le32(reloc_offset + 10, &buf[reloc_offset]);
200 put_unaligned_le32(10, &buf[reloc_offset + 4]);
201}
202
203static void update_pecoff_text(unsigned int text_start, unsigned int file_sz)
204{
205 unsigned int pe_header;
206 unsigned int text_sz = file_sz - text_start;
207
208 pe_header = get_unaligned_le32(&buf[0x3c]);
209
210 /*
211 * Size of code: Subtract the size of the first sector (512 bytes)
212 * which includes the header.
213 */
214 put_unaligned_le32(file_sz - 512, &buf[pe_header + 0x1c]);
215
216 /*
217 * Address of entry point for PE/COFF executable
218 */
219 put_unaligned_le32(text_start + efi_pe_entry, &buf[pe_header + 0x28]);
220
221 update_pecoff_section_header(".text", text_start, text_sz);
222}
223
224static void update_pecoff_bss(unsigned int file_sz, unsigned int init_sz)
225{
226 unsigned int pe_header;
227 unsigned int bss_sz = init_sz - file_sz;
228
229 pe_header = get_unaligned_le32(&buf[0x3c]);
230
231 /* Size of uninitialized data */
232 put_unaligned_le32(bss_sz, &buf[pe_header + 0x24]);
233
234 /* Size of image */
235 put_unaligned_le32(init_sz, &buf[pe_header + 0x50]);
236
237 update_pecoff_section_header_fields(".bss", file_sz, bss_sz, 0, 0);
238}
239
240static int reserve_pecoff_reloc_section(int c)
241{
242 /* Reserve 0x20 bytes for .reloc section */
243 memset(buf+c, 0, PECOFF_RELOC_RESERVE);
244 return PECOFF_RELOC_RESERVE;
245}
246
247static void efi_stub_defaults(void)
248{
249 /* Defaults for old kernel */
250#ifdef CONFIG_X86_32
251 efi_pe_entry = 0x10;
252#else
253 efi_pe_entry = 0x210;
254 startup_64 = 0x200;
255#endif
256}
257
258static void efi_stub_entry_update(void)
259{
260 unsigned long addr = efi32_stub_entry;
261
262#ifdef CONFIG_X86_64
263 /* Yes, this is really how we defined it :( */
264 addr = efi64_stub_entry - 0x200;
265#endif
266
267#ifdef CONFIG_EFI_MIXED
268 if (efi32_stub_entry != addr)
269 die("32-bit and 64-bit EFI entry points do not match\n");
270#endif
271 put_unaligned_le32(addr, &buf[0x264]);
272}
273
274#else
275
276static inline void update_pecoff_setup_and_reloc(unsigned int size) {}
277static inline void update_pecoff_text(unsigned int text_start,
278 unsigned int file_sz) {}
279static inline void update_pecoff_bss(unsigned int file_sz,
280 unsigned int init_sz) {}
281static inline void efi_stub_defaults(void) {}
282static inline void efi_stub_entry_update(void) {}
283
284static inline int reserve_pecoff_reloc_section(int c)
285{
286 return 0;
287}
288#endif /* CONFIG_EFI_STUB */
289
290
291/*
292 * Parse zoffset.h and find the entry points. We could just #include zoffset.h
293 * but that would mean tools/build would have to be rebuilt every time. It's
294 * not as if parsing it is hard...
295 */
296#define PARSE_ZOFS(p, sym) do { \
297 if (!strncmp(p, "#define ZO_" #sym " ", 11+sizeof(#sym))) \
298 sym = strtoul(p + 11 + sizeof(#sym), NULL, 16); \
299} while (0)
300
301static void parse_zoffset(char *fname)
302{
303 FILE *file;
304 char *p;
305 int c;
306
307 file = fopen(fname, "r");
308 if (!file)
309 die("Unable to open `%s': %m", fname);
310 c = fread(buf, 1, sizeof(buf) - 1, file);
311 if (ferror(file))
312 die("read-error on `zoffset.h'");
313 fclose(file);
314 buf[c] = 0;
315
316 p = (char *)buf;
317
318 while (p && *p) {
319 PARSE_ZOFS(p, efi32_stub_entry);
320 PARSE_ZOFS(p, efi64_stub_entry);
321 PARSE_ZOFS(p, efi_pe_entry);
322 PARSE_ZOFS(p, startup_64);
323
324 p = strchr(p, '\n');
325 while (p && (*p == '\r' || *p == '\n'))
326 p++;
327 }
328}
329
330int main(int argc, char ** argv)
331{
332 unsigned int i, sz, setup_sectors, init_sz;
333 int c;
334 u32 sys_size;
335 struct stat sb;
336 FILE *file, *dest;
337 int fd;
338 void *kernel;
339 u32 crc = 0xffffffffUL;
340
341 efi_stub_defaults();
342
343 if (argc != 5)
344 usage();
345 parse_zoffset(argv[3]);
346
347 dest = fopen(argv[4], "w");
348 if (!dest)
349 die("Unable to write `%s': %m", argv[4]);
350
351 /* Copy the setup code */
352 file = fopen(argv[1], "r");
353 if (!file)
354 die("Unable to open `%s': %m", argv[1]);
355 c = fread(buf, 1, sizeof(buf), file);
356 if (ferror(file))
357 die("read-error on `setup'");
358 if (c < 1024)
359 die("The setup must be at least 1024 bytes");
360 if (get_unaligned_le16(&buf[510]) != 0xAA55)
361 die("Boot block hasn't got boot flag (0xAA55)");
362 fclose(file);
363
364 c += reserve_pecoff_reloc_section(c);
365
366 /* Pad unused space with zeros */
367 setup_sectors = (c + 511) / 512;
368 if (setup_sectors < SETUP_SECT_MIN)
369 setup_sectors = SETUP_SECT_MIN;
370 i = setup_sectors*512;
371 memset(buf+c, 0, i-c);
372
373 update_pecoff_setup_and_reloc(i);
374
375 /* Set the default root device */
376 put_unaligned_le16(DEFAULT_ROOT_DEV, &buf[508]);
377
378 printf("Setup is %d bytes (padded to %d bytes).\n", c, i);
379
380 /* Open and stat the kernel file */
381 fd = open(argv[2], O_RDONLY);
382 if (fd < 0)
383 die("Unable to open `%s': %m", argv[2]);
384 if (fstat(fd, &sb))
385 die("Unable to stat `%s': %m", argv[2]);
386 sz = sb.st_size;
387 printf("System is %d kB\n", (sz+1023)/1024);
388 kernel = mmap(NULL, sz, PROT_READ, MAP_SHARED, fd, 0);
389 if (kernel == MAP_FAILED)
390 die("Unable to mmap '%s': %m", argv[2]);
391 /* Number of 16-byte paragraphs, including space for a 4-byte CRC */
392 sys_size = (sz + 15 + 4) / 16;
393
394 /* Patch the setup code with the appropriate size parameters */
395 buf[0x1f1] = setup_sectors-1;
396 put_unaligned_le32(sys_size, &buf[0x1f4]);
397
398 update_pecoff_text(setup_sectors * 512, i + (sys_size * 16));
399 init_sz = get_unaligned_le32(&buf[0x260]);
400 update_pecoff_bss(i + (sys_size * 16), init_sz);
401
402 efi_stub_entry_update();
403
404 crc = partial_crc32(buf, i, crc);
405 if (fwrite(buf, 1, i, dest) != i)
406 die("Writing setup failed");
407
408 /* Copy the kernel code */
409 crc = partial_crc32(kernel, sz, crc);
410 if (fwrite(kernel, 1, sz, dest) != sz)
411 die("Writing kernel failed");
412
413 /* Add padding leaving 4 bytes for the checksum */
414 while (sz++ < (sys_size*16) - 4) {
415 crc = partial_crc32_one('\0', crc);
416 if (fwrite("\0", 1, 1, dest) != 1)
417 die("Writing padding failed");
418 }
419
420 /* Write the CRC */
421 printf("CRC %x\n", crc);
422 put_unaligned_le32(crc, buf);
423 if (fwrite(buf, 1, 4, dest) != 4)
424 die("Writing CRC failed");
425
426 /* Catch any delayed write failures */
427 if (fclose(dest))
428 die("Writing image failed");
429
430 close(fd);
431
432 /* Everything is OK */
433 return 0;
434}
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
56#ifdef CONFIG_EFI_MIXED
57#define PECOFF_COMPAT_RESERVE 0x20
58#else
59#define PECOFF_COMPAT_RESERVE 0x0
60#endif
61
62static unsigned long efi32_stub_entry;
63static unsigned long efi64_stub_entry;
64static unsigned long efi_pe_entry;
65static unsigned long efi32_pe_entry;
66static unsigned long kernel_info;
67static unsigned long startup_64;
68static unsigned long _ehead;
69static unsigned long _end;
70
71/*----------------------------------------------------------------------*/
72
73static const u32 crctab32[] = {
74 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
75 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
76 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
77 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
78 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
79 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
80 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
81 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
82 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
83 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
84 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
85 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
86 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
87 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
88 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
89 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
90 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
91 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
92 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
93 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
94 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
95 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
96 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
97 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
98 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
99 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
100 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
101 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
102 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
103 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
104 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
105 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
106 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
107 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
108 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
109 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
110 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
111 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
112 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
113 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
114 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
115 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
116 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
117 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
118 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
119 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
120 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
121 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
122 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
123 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
124 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
125 0x2d02ef8d
126};
127
128static u32 partial_crc32_one(u8 c, u32 crc)
129{
130 return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8);
131}
132
133static u32 partial_crc32(const u8 *s, int len, u32 crc)
134{
135 while (len--)
136 crc = partial_crc32_one(*s++, crc);
137 return crc;
138}
139
140static void die(const char * str, ...)
141{
142 va_list args;
143 va_start(args, str);
144 vfprintf(stderr, str, args);
145 va_end(args);
146 fputc('\n', stderr);
147 exit(1);
148}
149
150static void usage(void)
151{
152 die("Usage: build setup system zoffset.h image");
153}
154
155#ifdef CONFIG_EFI_STUB
156
157static void update_pecoff_section_header_fields(char *section_name, u32 vma, u32 size, u32 datasz, u32 offset)
158{
159 unsigned int pe_header;
160 unsigned short num_sections;
161 u8 *section;
162
163 pe_header = get_unaligned_le32(&buf[0x3c]);
164 num_sections = get_unaligned_le16(&buf[pe_header + 6]);
165
166#ifdef CONFIG_X86_32
167 section = &buf[pe_header + 0xa8];
168#else
169 section = &buf[pe_header + 0xb8];
170#endif
171
172 while (num_sections > 0) {
173 if (strncmp((char*)section, section_name, 8) == 0) {
174 /* section header size field */
175 put_unaligned_le32(size, section + 0x8);
176
177 /* section header vma field */
178 put_unaligned_le32(vma, section + 0xc);
179
180 /* section header 'size of initialised data' field */
181 put_unaligned_le32(datasz, section + 0x10);
182
183 /* section header 'file offset' field */
184 put_unaligned_le32(offset, section + 0x14);
185
186 break;
187 }
188 section += 0x28;
189 num_sections--;
190 }
191}
192
193static void update_pecoff_section_header(char *section_name, u32 offset, u32 size)
194{
195 update_pecoff_section_header_fields(section_name, offset, size, size, offset);
196}
197
198static void update_pecoff_setup_and_reloc(unsigned int size)
199{
200 u32 setup_offset = 0x200;
201 u32 reloc_offset = size - PECOFF_RELOC_RESERVE - PECOFF_COMPAT_RESERVE;
202#ifdef CONFIG_EFI_MIXED
203 u32 compat_offset = reloc_offset + PECOFF_RELOC_RESERVE;
204#endif
205 u32 setup_size = reloc_offset - setup_offset;
206
207 update_pecoff_section_header(".setup", setup_offset, setup_size);
208 update_pecoff_section_header(".reloc", reloc_offset, PECOFF_RELOC_RESERVE);
209
210 /*
211 * Modify .reloc section contents with a single entry. The
212 * relocation is applied to offset 10 of the relocation section.
213 */
214 put_unaligned_le32(reloc_offset + 10, &buf[reloc_offset]);
215 put_unaligned_le32(10, &buf[reloc_offset + 4]);
216
217#ifdef CONFIG_EFI_MIXED
218 update_pecoff_section_header(".compat", compat_offset, PECOFF_COMPAT_RESERVE);
219
220 /*
221 * Put the IA-32 machine type (0x14c) and the associated entry point
222 * address in the .compat section, so loaders can figure out which other
223 * execution modes this image supports.
224 */
225 buf[compat_offset] = 0x1;
226 buf[compat_offset + 1] = 0x8;
227 put_unaligned_le16(0x14c, &buf[compat_offset + 2]);
228 put_unaligned_le32(efi32_pe_entry + size, &buf[compat_offset + 4]);
229#endif
230}
231
232static void update_pecoff_text(unsigned int text_start, unsigned int file_sz,
233 unsigned int init_sz)
234{
235 unsigned int pe_header;
236 unsigned int text_sz = file_sz - text_start;
237 unsigned int bss_sz = init_sz - file_sz;
238
239 pe_header = get_unaligned_le32(&buf[0x3c]);
240
241 /*
242 * The PE/COFF loader may load the image at an address which is
243 * misaligned with respect to the kernel_alignment field in the setup
244 * header.
245 *
246 * In order to avoid relocating the kernel to correct the misalignment,
247 * add slack to allow the buffer to be aligned within the declared size
248 * of the image.
249 */
250 bss_sz += CONFIG_PHYSICAL_ALIGN;
251 init_sz += CONFIG_PHYSICAL_ALIGN;
252
253 /*
254 * Size of code: Subtract the size of the first sector (512 bytes)
255 * which includes the header.
256 */
257 put_unaligned_le32(file_sz - 512 + bss_sz, &buf[pe_header + 0x1c]);
258
259 /* Size of image */
260 put_unaligned_le32(init_sz, &buf[pe_header + 0x50]);
261
262 /*
263 * Address of entry point for PE/COFF executable
264 */
265 put_unaligned_le32(text_start + efi_pe_entry, &buf[pe_header + 0x28]);
266
267 update_pecoff_section_header_fields(".text", text_start, text_sz + bss_sz,
268 text_sz, text_start);
269}
270
271static int reserve_pecoff_reloc_section(int c)
272{
273 /* Reserve 0x20 bytes for .reloc section */
274 memset(buf+c, 0, PECOFF_RELOC_RESERVE);
275 return PECOFF_RELOC_RESERVE;
276}
277
278static void efi_stub_defaults(void)
279{
280 /* Defaults for old kernel */
281#ifdef CONFIG_X86_32
282 efi_pe_entry = 0x10;
283#else
284 efi_pe_entry = 0x210;
285 startup_64 = 0x200;
286#endif
287}
288
289static void efi_stub_entry_update(void)
290{
291 unsigned long addr = efi32_stub_entry;
292
293#ifdef CONFIG_X86_64
294 /* Yes, this is really how we defined it :( */
295 addr = efi64_stub_entry - 0x200;
296#endif
297
298#ifdef CONFIG_EFI_MIXED
299 if (efi32_stub_entry != addr)
300 die("32-bit and 64-bit EFI entry points do not match\n");
301#endif
302 put_unaligned_le32(addr, &buf[0x264]);
303}
304
305#else
306
307static inline void update_pecoff_setup_and_reloc(unsigned int size) {}
308static inline void update_pecoff_text(unsigned int text_start,
309 unsigned int file_sz,
310 unsigned int init_sz) {}
311static inline void efi_stub_defaults(void) {}
312static inline void efi_stub_entry_update(void) {}
313
314static inline int reserve_pecoff_reloc_section(int c)
315{
316 return 0;
317}
318#endif /* CONFIG_EFI_STUB */
319
320static int reserve_pecoff_compat_section(int c)
321{
322 /* Reserve 0x20 bytes for .compat section */
323 memset(buf+c, 0, PECOFF_COMPAT_RESERVE);
324 return PECOFF_COMPAT_RESERVE;
325}
326
327/*
328 * Parse zoffset.h and find the entry points. We could just #include zoffset.h
329 * but that would mean tools/build would have to be rebuilt every time. It's
330 * not as if parsing it is hard...
331 */
332#define PARSE_ZOFS(p, sym) do { \
333 if (!strncmp(p, "#define ZO_" #sym " ", 11+sizeof(#sym))) \
334 sym = strtoul(p + 11 + sizeof(#sym), NULL, 16); \
335} while (0)
336
337static void parse_zoffset(char *fname)
338{
339 FILE *file;
340 char *p;
341 int c;
342
343 file = fopen(fname, "r");
344 if (!file)
345 die("Unable to open `%s': %m", fname);
346 c = fread(buf, 1, sizeof(buf) - 1, file);
347 if (ferror(file))
348 die("read-error on `zoffset.h'");
349 fclose(file);
350 buf[c] = 0;
351
352 p = (char *)buf;
353
354 while (p && *p) {
355 PARSE_ZOFS(p, efi32_stub_entry);
356 PARSE_ZOFS(p, efi64_stub_entry);
357 PARSE_ZOFS(p, efi_pe_entry);
358 PARSE_ZOFS(p, efi32_pe_entry);
359 PARSE_ZOFS(p, kernel_info);
360 PARSE_ZOFS(p, startup_64);
361 PARSE_ZOFS(p, _ehead);
362 PARSE_ZOFS(p, _end);
363
364 p = strchr(p, '\n');
365 while (p && (*p == '\r' || *p == '\n'))
366 p++;
367 }
368}
369
370int main(int argc, char ** argv)
371{
372 unsigned int i, sz, setup_sectors, init_sz;
373 int c;
374 u32 sys_size;
375 struct stat sb;
376 FILE *file, *dest;
377 int fd;
378 void *kernel;
379 u32 crc = 0xffffffffUL;
380
381 efi_stub_defaults();
382
383 if (argc != 5)
384 usage();
385 parse_zoffset(argv[3]);
386
387 dest = fopen(argv[4], "w");
388 if (!dest)
389 die("Unable to write `%s': %m", argv[4]);
390
391 /* Copy the setup code */
392 file = fopen(argv[1], "r");
393 if (!file)
394 die("Unable to open `%s': %m", argv[1]);
395 c = fread(buf, 1, sizeof(buf), file);
396 if (ferror(file))
397 die("read-error on `setup'");
398 if (c < 1024)
399 die("The setup must be at least 1024 bytes");
400 if (get_unaligned_le16(&buf[510]) != 0xAA55)
401 die("Boot block hasn't got boot flag (0xAA55)");
402 fclose(file);
403
404 c += reserve_pecoff_compat_section(c);
405 c += reserve_pecoff_reloc_section(c);
406
407 /* Pad unused space with zeros */
408 setup_sectors = (c + 511) / 512;
409 if (setup_sectors < SETUP_SECT_MIN)
410 setup_sectors = SETUP_SECT_MIN;
411 i = setup_sectors*512;
412 memset(buf+c, 0, i-c);
413
414 update_pecoff_setup_and_reloc(i);
415
416 /* Set the default root device */
417 put_unaligned_le16(DEFAULT_ROOT_DEV, &buf[508]);
418
419 printf("Setup is %d bytes (padded to %d bytes).\n", c, i);
420
421 /* Open and stat the kernel file */
422 fd = open(argv[2], O_RDONLY);
423 if (fd < 0)
424 die("Unable to open `%s': %m", argv[2]);
425 if (fstat(fd, &sb))
426 die("Unable to stat `%s': %m", argv[2]);
427 sz = sb.st_size;
428 printf("System is %d kB\n", (sz+1023)/1024);
429 kernel = mmap(NULL, sz, PROT_READ, MAP_SHARED, fd, 0);
430 if (kernel == MAP_FAILED)
431 die("Unable to mmap '%s': %m", argv[2]);
432 /* Number of 16-byte paragraphs, including space for a 4-byte CRC */
433 sys_size = (sz + 15 + 4) / 16;
434#ifdef CONFIG_EFI_STUB
435 /*
436 * COFF requires minimum 32-byte alignment of sections, and
437 * adding a signature is problematic without that alignment.
438 */
439 sys_size = (sys_size + 1) & ~1;
440#endif
441
442 /* Patch the setup code with the appropriate size parameters */
443 buf[0x1f1] = setup_sectors-1;
444 put_unaligned_le32(sys_size, &buf[0x1f4]);
445
446 init_sz = get_unaligned_le32(&buf[0x260]);
447#ifdef CONFIG_EFI_STUB
448 /*
449 * The decompression buffer will start at ImageBase. When relocating
450 * the compressed kernel to its end, we must ensure that the head
451 * section does not get overwritten. The head section occupies
452 * [i, i + _ehead), and the destination is [init_sz - _end, init_sz).
453 *
454 * At present these should never overlap, because 'i' is at most 32k
455 * because of SETUP_SECT_MAX, '_ehead' is less than 1k, and the
456 * calculation of INIT_SIZE in boot/header.S ensures that
457 * 'init_sz - _end' is at least 64k.
458 *
459 * For future-proofing, increase init_sz if necessary.
460 */
461
462 if (init_sz - _end < i + _ehead) {
463 init_sz = (i + _ehead + _end + 4095) & ~4095;
464 put_unaligned_le32(init_sz, &buf[0x260]);
465 }
466#endif
467 update_pecoff_text(setup_sectors * 512, i + (sys_size * 16), init_sz);
468
469 efi_stub_entry_update();
470
471 /* Update kernel_info offset. */
472 put_unaligned_le32(kernel_info, &buf[0x268]);
473
474 crc = partial_crc32(buf, i, crc);
475 if (fwrite(buf, 1, i, dest) != i)
476 die("Writing setup failed");
477
478 /* Copy the kernel code */
479 crc = partial_crc32(kernel, sz, crc);
480 if (fwrite(kernel, 1, sz, dest) != sz)
481 die("Writing kernel failed");
482
483 /* Add padding leaving 4 bytes for the checksum */
484 while (sz++ < (sys_size*16) - 4) {
485 crc = partial_crc32_one('\0', crc);
486 if (fwrite("\0", 1, 1, dest) != 1)
487 die("Writing padding failed");
488 }
489
490 /* Write the CRC */
491 printf("CRC %x\n", crc);
492 put_unaligned_le32(crc, buf);
493 if (fwrite(buf, 1, 4, dest) != 4)
494 die("Writing CRC failed");
495
496 /* Catch any delayed write failures */
497 if (fclose(dest))
498 die("Writing image failed");
499
500 close(fd);
501
502 /* Everything is OK */
503 return 0;
504}