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
  33 int 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;
  78 bail:
  79         if (f)
  80                 fclose(f);
  81         return retval;
  82 }