syslinux/memdisk/postprocess.pl
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   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
  20eval { use bytes; };
  21
  22($out,$file16,$file32) = @ARGV;
  23
  24open(OUT, "> $out\0") or die "$0: Cannot create file: $out\n";
  25eval { binmode OUT; };
  26open(FILE, "< $file16\0") or die "$0: Cannot open file: $file16\n";
  27eval { binmode FILE };
  28
  29@info = stat(FILE);
  30$size = $info[7];
  31
  32$sectors = ($size + 511) >> 9;
  33$xsize = $sectors << 9;
  34
  35read(FILE, $f16, $size);
  36
  37print OUT $f16;
  38
  39if ( $size != $xsize ) {
  40    # Pad to a sector boundary
  41    print OUT "\0" x ($xsize-$size);
  42}
  43
  44seek(OUT, 0x1f1, SEEK_SET);     # setup_sects
  45# All sectors are setup except the first
  46print OUT pack("C", $sectors-1);
  47
  48seek(OUT, $xsize, SEEK_SET);
  49close(FILE);
  50
  51open(FILE, "+< $file32\0") or die "$0: Cannot open file: $file32\n";
  52
  53while ( ($n = read(FILE, $f32, 65536)) > 0 ) {
  54    print OUT $f32;
  55}
  56
  57close(FILE);
  58close(OUT);
  59
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