projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 02a884c0 PA |
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 | } |