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 #include <tools/le_byteshift.h>
33
main(int argc,char * argv[])34 int main(int argc, char *argv[])
35 {
36 uint32_t olen;
37 long ilen;
38 unsigned long offs;
39 FILE *f;
40
41 if (argc < 2) {
42 fprintf(stderr, "Usage: %s compressed_file\n", argv[0]);
43 return 1;
44 }
45
46 /* Get the information for the compressed kernel image first */
47
48 f = fopen(argv[1], "r");
49 if (!f) {
50 perror(argv[1]);
51 return 1;
52 }
53
54
55 if (fseek(f, -4L, SEEK_END)) {
56 perror(argv[1]);
57 }
58
59 if (fread(&olen, sizeof(olen), 1, f) != 1) {
60 perror(argv[1]);
61 return 1;
62 }
63
64 ilen = ftell(f);
65 olen = get_unaligned_le32(&olen);
66 fclose(f);
67
68 /*
69 * Now we have the input (compressed) and output (uncompressed)
70 * sizes, compute the necessary decompression offset...
71 */
72
73 offs = (olen > ilen) ? olen - ilen : 0;
74 offs += olen >> 12; /* Add 8 bytes for each 32K block */
75 offs += 64*1024 + 128; /* Add 64K + 128 bytes slack */
76 offs = (offs+4095) & ~4095; /* Round to a 4K boundary */
77
78 printf(".section \".rodata..compressed\",\"a\",@progbits\n");
79 printf(".globl z_input_len\n");
80 printf("z_input_len = %lu\n", ilen);
81 printf(".globl z_output_len\n");
82 printf("z_output_len = %lu\n", (unsigned long)olen);
83 printf(".globl z_extract_offset\n");
84 printf("z_extract_offset = 0x%lx\n", offs);
85 /* z_extract_offset_negative allows simplification of head_32.S */
86 printf(".globl z_extract_offset_negative\n");
87 printf("z_extract_offset_negative = -0x%lx\n", offs);
88
89 printf(".globl input_data, input_data_end\n");
90 printf("input_data:\n");
91 printf(".incbin \"%s\"\n", argv[1]);
92 printf("input_data_end:\n");
93
94 return 0;
95 }
96