memdisk/postprocess.pl

   1 #!/usr/bin/perl
   2 ## -----------------------------------------------------------------------
   3 ##
   4 ##   Copyright 2001-2008 H. Peter Anvin - All Rights Reserved
   5 ##
   6 ##   This program is free software; you can redistribute it and/or modify
   7 ##   it under the terms of the GNU General Public License as published by
   8 ##   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
   9 ##   Boston MA 02111-1307, USA; either version 2 of the License, or
  10 ##   (at your option) any later version; incorporated herein by reference.
  11 ##
  12 ## -----------------------------------------------------------------------
  13
  14 #
  15 # Postprocess the memdisk binary.  Used during the 'make' process.
  16 # We write memdisk16.bin out to the final memdisk kernel, pad it to an
  17 # integral 512-byte sector length, write this number of sectors into the
  18 # kernel header field "setup_sects", then append memdisk32.bin
  19
  20 eval { use bytes; };
  21
  22 ($out,$file16,$file32) = @ARGV;
  23
  24 open(OUT, "> $out\0") or die "$0: Cannot create file: $out\n";
  25 eval { binmode OUT; };
  26 open(FILE, "< $file16\0") or die "$0: Cannot open file: $file16\n";
  27 eval { binmode FILE };
  28
  29 @info = stat(FILE);
  30 $size = $info[7];
  31
  32 $sectors = ($size + 511) >> 9;
  33 $xsize = $sectors << 9;
  34
  35 read(FILE, $f16, $size);
  36
  37 print OUT $f16;
  38
  39 if ( $size != $xsize ) {
  40     # Pad to a sector boundary
  41     print OUT "\0" x ($xsize-$size);
  42 }
  43
  44 seek(OUT, 0x1f1, SEEK_SET);     # setup_sects
  45 # All sectors are setup except the first
  46 print OUT pack("C", $sectors-1);
  47
  48 seek(OUT, $xsize, SEEK_SET);
  49 close(FILE);
  50
  51 open(FILE, "+< $file32\0") or die "$0: Cannot open file: $file32\n";
  52
  53 while ( ($n = read(FILE, $f32, 65536)) > 0 ) {
  54     print OUT $f32;
  55 }
  56
  57 close(FILE);
  58 close(OUT);