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 34 int main(int argc, char *argv[]) 35 { 36 uint32_t olen; 37 long ilen; 38 unsigned long offs; 39 FILE *f = NULL; 40 int retval = 1; 41 42 if (argc < 2) { 43 fprintf(stderr, "Usage: %s compressed_file\n", argv[0]); 44 goto bail; 45 } 46 47 /* Get the information for the compressed kernel image first */ 48 49 f = fopen(argv[1], "r"); 50 if (!f) { 51 perror(argv[1]); 52 goto bail; 53 } 54 55 56 if (fseek(f, -4L, SEEK_END)) { 57 perror(argv[1]); 58 } 59 60 if (fread(&olen, sizeof(olen), 1, f) != 1) { 61 perror(argv[1]); 62 goto bail; 63 } 64 65 ilen = ftell(f); 66 olen = get_unaligned_le32(&olen); 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 retval = 0; 95 bail: 96 if (f) 97 fclose(f); 98 return retval; 99 } 100