xv6

port of xv6 to x86-64
git clone http://frotz.net/git/xv6.git
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sign.pl (363B)

      1 #!/usr/bin/perl
      2 
      3 open(SIG, $ARGV[0]) || die "open $ARGV[0]: $!";
      4 
      5 $n = sysread(SIG, $buf, 1000);
      6 
      7 if($n > 510){
      8   print STDERR "boot block too large: $n bytes (max 510)\n";
      9   exit 1;
     10 }
     11 
     12 print STDERR "boot block is $n bytes (max 510)\n";
     13 
     14 $buf .= "\0" x (510-$n);
     15 $buf .= "\x55\xAA";
     16 
     17 open(SIG, ">$ARGV[0]") || die "open >$ARGV[0]: $!";
     18 print SIG $buf;
     19 close SIG;