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authorH. Peter Anvin <hpa@zytor.com>2009-05-21 13:34:12 -0700
committerH. Peter Anvin <hpa@zytor.com>2009-05-21 13:35:22 -0700
commitd4d9f190900d31b5e9428401a0175012957d7cb7 (patch)
tree3b1bfe13f7b711905591ee1e92fde70ee3ab437d /utils/isohybrid.in
parent652070309f5d283efacaa8c5102368da20a92c4a (diff)
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isohybrid: allow selecting the _c and _f versions of the prefix
Allow selecting the _f or _c versions of the prefix in addition to the default one. This is specified with the -forcehd0 or -ctrlhd0 options. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'utils/isohybrid.in')
-rw-r--r--utils/isohybrid.in51
1 files changed, 37 insertions, 14 deletions
diff --git a/utils/isohybrid.in b/utils/isohybrid.in
index 61ff795d..2bbaada4 100644
--- a/utils/isohybrid.in
+++ b/utils/isohybrid.in
@@ -2,6 +2,7 @@
## -----------------------------------------------------------------------
##
## Copyright 2002-2008 H. Peter Anvin - All Rights Reserved
+## Copyright 2009 Intel Corporation; author: H. Peter Anvin
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
@@ -41,17 +42,27 @@ use Fcntl;
'offset' => [0, 64],
'type' => [0, 255],
'id' => [0, 0xffffffff],
+ 'hd0' => [0, 2],
+);
+
+# Boolean options just set other options
+%bool_opt = (
+ 'nohd0' => ['hd0', 0],
+ 'forcehd0' => ['hd0', 1],
+ 'ctrlhd0' => ['hd0', 2],
);
sub usage() {
- print STDERR "Usage: $0 [options] filename\n",
+ print STDERR "Usage: $0 [options] filename.iso\n",
"Options:\n",
- " -h Number of default geometry heads\n",
- " -s Number of default geometry sectors\n",
- " -entry Specify partition entry number (1-4)\n",
- " -offset Specify partition offset (default 0)\n",
- " -type Specify partition type (default 0x17)\n",
- " -id Specify MBR ID (default random)\n";
+ " -h Number of default geometry heads\n",
+ " -s Number of default geometry sectors\n",
+ " -entry Specify partition entry number (1-4)\n",
+ " -offset Specify partition offset (default 0)\n",
+ " -type Specify partition type (default 0x17)\n",
+ " -id Specify MBR ID (default random)\n",
+ " -forcehd0 Always assume we are loaded as disk ID 0\n",
+ " -ctrlhd0 Assume disk ID 0 if the Ctrl key is pressed\n",
exit 1;
}
@@ -77,10 +88,26 @@ sub get_random() {
return ($$+time()) & 0xffffffff;
}
+sub get_hex_data() {
+ my $mbr = '';
+ my $line, $byte;
+ while ( $line = <DATA> ) {
+ chomp $line;
+ last if ($line eq '*');
+ foreach $byte ( split(/\s+/, $line) ) {
+ $mbr .= chr(hex($byte));
+ }
+ }
+ return $mbr;
+}
+
while ($ARGV[0] =~ /^\-(.*)$/) {
$o = $1;
shift @ARGV;
- if (exists($opt{$o})) {
+ if (defined($bool_opt{$o})) {
+ ($o, $v) = @{$bool_opt{$o}};
+ $opt{$o} = $v;
+ } elsif (exists($opt{$o})) {
$opt{$o} = doh(shift @ARGV);
if (defined($valid_range{$o})) {
($l, $h) = @{$valid_range{$o}};
@@ -175,12 +202,8 @@ if (defined($opt{'id'})) {
# Print the MBR and partition table
seek(FILE, 0, SEEK_SET) or die "$0: $file: $!\n";
-$mbr = '';
-while ( $line = <DATA> ) {
- chomp $line;
- foreach $byte ( split(/\s+/, $line) ) {
- $mbr .= chr(hex($byte));
- }
+for ($i = 0; $i <= $opt{'hd0'}; $i++) {
+ $mbr = get_hex_data();
}
if ( length($mbr) > 432 ) {
die "$0: Bad MBR code\n";