memdisk/fdgeo.pl

   1 #!/usr/bin/perl
   2 #
   3 # Try automatic generation of geometries
   4 #
   5
   6 ($k) = @ARGV;
   7 $sec = int($k*2+0.5);
   8
   9 if ($sec < 320*2) {
  10     $c = 40;
  11     $h = 1;
  12     $type = 1;
  13 } elsif ($sec < 640*2) {
  14     $c = 40;
  15     $h = 2;
  16     $type = 1;
  17 } elsif ($sec < 1200*2) {
  18     $c = 80;
  19     $h = 2;
  20     $type = 3;
  21 } elsif ($sec < 1440*2) {
  22     $c = 80;
  23     $h = 2;
  24     $type = 2;
  25 } elsif ($sec < 2880*2) {
  26     $c = 80;
  27     $h = 2;
  28     $type = 4;
  29 } elsif ($sec < 4096*2) {
  30     $c = 80;
  31     $h = 2;
  32     $type = 6;
  33 } else {
  34     printf "%.1fK, %d sectors: ", $sec/2, $sec;
  35     print "Considered a hard disk\n";
  36     exit 2;
  37 }
  38
  39 $ok = 0;
  40 while ($c < 256) {
  41     $s = int($sec/($c*$h)+0.5);
  42     if ($s <= 63 && $sec == $c*$h*$s) {
  43         $ok = 1;
  44         last;
  45     }
  46     $c++;
  47 }
  48
  49 printf "%.1fK, %d sectors: ", $sec/2, $sec;
  50 if ($ok) {
  51     print "c=$c, h=$h, s=$s, type=$type\n";
  52     exit 0;
  53 } else {
  54     print "No valid geometry found (MEMDISK will fake it)\n";
  55     exit 1;
  56 }