1 /* ----------------------------------------------------------------------- *
2 *
3 * Copyright (C) 2009 Intel Corporation. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License version
7 * 2 as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17 * 02110-1301, USA.
18 *
19 * H. Peter Anvin <hpa@linux.intel.com>
20 *
21 * ----------------------------------------------------------------------- */
22
23 /*
24 * Compute the desired load offset from a compressed program; outputs
25 * a small assembly wrapper with the appropriate symbols defined.
26 */
27
28 #include <stdlib.h>
29 #include <stdio.h>
30 #include <string.h>
31 #include <inttypes.h>
32
33 static uint32_t getle32(const void *p)
34 {
35 const uint8_t *cp = p;
36
37 return (uint32_t)cp[0] + ((uint32_t)cp[1] << 8) +
38 ((uint32_t)cp[2] << 16) + ((uint32_t)cp[3] << 24);
39 }
40
41 int main(int argc, char *argv[])
42 {
43 uint32_t olen;
44 long ilen;
45 unsigned long offs;
46 FILE *f;
47
48 if (argc < 2) {
49 fprintf(stderr, "Usage: %s compressed_file\n", argv[0]);
50 return 1;
51 }
52
53 /* Get the information for the compressed kernel image first */
54
55 f = fopen(argv[1], "r");
56 if (!f) {
57 perror(argv[1]);
58 return 1;
59 }
60
61
62 if (fseek(f, -4L, SEEK_END)) {
63 perror(argv[1]);
64 }
65 fread(&olen, sizeof olen, 1, f);
66 ilen = ftell(f);
67 olen = getle32(&olen);
68 fclose(f);
69
70 /*
71 * Now we have the input (compressed) and output (uncompressed)
72 * sizes, compute the necessary decompression offset...
73 */
74
75 offs = (olen > ilen) ? olen - ilen : 0;
76 offs += olen >> 12; /* Add 8 bytes for each 32K block */
77 offs += 32*1024 + 18; /* Add 32K + 18 bytes slack */
78 offs = (offs+4095) & ~4095; /* Round to a 4K boundary */
79
80 printf(".section \".rodata.compressed\",\"a\",@progbits\n");
81 printf(".globl z_input_len\n");
82 printf("z_input_len = %lu\n", ilen);
83 printf(".globl z_output_len\n");
84 printf("z_output_len = %lu\n", (unsigned long)olen);
85 printf(".globl z_extract_offset\n");
86 printf("z_extract_offset = 0x%lx\n", offs);
87 /* z_extract_offset_negative allows simplification of head_32.S */
88 printf(".globl z_extract_offset_negative\n");
89 printf("z_extract_offset_negative = -0x%lx\n", offs);
90
91 printf(".globl input_data, input_data_end\n");
92 printf("input_data:\n");
93 printf(".incbin \"%s\"\n", argv[1]);
94 printf("input_data_end:\n");
95
96 return 0;
97 }
98
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