LXR linux/arch/x86/boot/compressed/mkpiggy.c

   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 * Outputs a small assembly wrapper with the appropriate symbols defined.
  24 *
  25 */
  26
  27#include <stdlib.h>
  28#include <stdio.h>
  29#include <string.h>
  30#include <inttypes.h>
  31#include <tools/le_byteshift.h>
  32
  33int main(int argc, char *argv[])
  34{
  35        uint32_t olen;
  36        long ilen;
  37        FILE *f = NULL;
  38        int retval = 1;
  39
  40        if (argc < 2) {
  41                fprintf(stderr, "Usage: %s compressed_file\n", argv[0]);
  42                goto bail;
  43        }
  44
  45        /* Get the information for the compressed kernel image first */
  46
  47        f = fopen(argv[1], "r");
  48        if (!f) {
  49                perror(argv[1]);
  50                goto bail;
  51        }
  52
  53
  54        if (fseek(f, -4L, SEEK_END)) {
  55                perror(argv[1]);
  56        }
  57
  58        if (fread(&olen, sizeof(olen), 1, f) != 1) {
  59                perror(argv[1]);
  60                goto bail;
  61        }
  62
  63        ilen = ftell(f);
  64        olen = get_unaligned_le32(&olen);
  65
  66        printf(".section \".rodata..compressed\",\"a\",@progbits\n");
  67        printf(".globl z_input_len\n");
  68        printf("z_input_len = %lu\n", ilen);
  69        printf(".globl z_output_len\n");
  70        printf("z_output_len = %lu\n", (unsigned long)olen);
  71
  72        printf(".globl input_data, input_data_end\n");
  73        printf("input_data:\n");
  74        printf(".incbin \"%s\"\n", argv[1]);
  75        printf("input_data_end:\n");
  76
  77        retval = 0;
  78bail:
  79        if (f)
  80                fclose(f);
  81        return retval;
  82}
  83