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+package Option::ROM;
+
+# Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
+#
+# 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 the Free Software Foundation; either version 2 of the
+# License, or any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+=head1 NAME
+
+Option::ROM - Option ROM manipulation
+
+=head1 SYNOPSIS
+
+ use Option::ROM;
+
+ # Load a ROM image
+ my $rom = new Option::ROM;
+ $rom->load ( "rtl8139.rom" );
+
+ # Modify the PCI device ID
+ $rom->pci_header->{device_id} = 0x1234;
+ $rom->fix_checksum();
+
+ # Write ROM image out to a new file
+ $rom->save ( "rtl8139-modified.rom" );
+
+=head1 DESCRIPTION
+
+C<Option::ROM> provides a mechanism for manipulating Option ROM
+images.
+
+=head1 METHODS
+
+=cut
+
+##############################################################################
+#
+# Option::ROM::Fields
+#
+##############################################################################
+
+package Option::ROM::Fields;
+
+use strict;
+use warnings;
+use Carp;
+use bytes;
+
+sub TIEHASH {
+ my $class = shift;
+ my $self = shift;
+
+ bless $self, $class;
+ return $self;
+}
+
+sub FETCH {
+ my $self = shift;
+ my $key = shift;
+
+ return undef unless $self->EXISTS ( $key );
+ my $raw = substr ( ${$self->{data}},
+ ( $self->{offset} + $self->{fields}->{$key}->{offset} ),
+ $self->{fields}->{$key}->{length} );
+ my $unpack = ( ref $self->{fields}->{$key}->{unpack} ?
+ $self->{fields}->{$key}->{unpack} :
+ sub { unpack ( $self->{fields}->{$key}->{pack}, shift ); } );
+ return &$unpack ( $raw );
+}
+
+sub STORE {
+ my $self = shift;
+ my $key = shift;
+ my $value = shift;
+
+ croak "Nonexistent field \"$key\"" unless $self->EXISTS ( $key );
+ my $pack = ( ref $self->{fields}->{$key}->{pack} ?
+ $self->{fields}->{$key}->{pack} :
+ sub { pack ( $self->{fields}->{$key}->{pack}, shift ); } );
+ my $raw = &$pack ( $value );
+ substr ( ${$self->{data}},
+ ( $self->{offset} + $self->{fields}->{$key}->{offset} ),
+ $self->{fields}->{$key}->{length} ) = $raw;
+}
+
+sub DELETE {
+ my $self = shift;
+ my $key = shift;
+
+ $self->STORE ( $key, 0 );
+}
+
+sub CLEAR {
+ my $self = shift;
+
+ foreach my $key ( keys %{$self->{fields}} ) {
+ $self->DELETE ( $key );
+ }
+}
+
+sub EXISTS {
+ my $self = shift;
+ my $key = shift;
+
+ return ( exists $self->{fields}->{$key} &&
+ ( ( $self->{fields}->{$key}->{offset} +
+ $self->{fields}->{$key}->{length} ) <= $self->{length} ) );
+}
+
+sub FIRSTKEY {
+ my $self = shift;
+
+ keys %{$self->{fields}};
+ return each %{$self->{fields}};
+}
+
+sub NEXTKEY {
+ my $self = shift;
+ my $lastkey = shift;
+
+ return each %{$self->{fields}};
+}
+
+sub SCALAR {
+ my $self = shift;
+
+ return 1;
+}
+
+sub UNTIE {
+ my $self = shift;
+}
+
+sub DESTROY {
+ my $self = shift;
+}
+
+sub checksum {
+ my $self = shift;
+
+ my $raw = substr ( ${$self->{data}}, $self->{offset}, $self->{length} );
+ return unpack ( "%8C*", $raw );
+}
+
+##############################################################################
+#
+# Option::ROM
+#
+##############################################################################
+
+package Option::ROM;
+
+use strict;
+use warnings;
+use Carp;
+use bytes;
+use Exporter 'import';
+
+use constant ROM_SIGNATURE => 0xaa55;
+use constant PCI_SIGNATURE => 'PCIR';
+use constant PNP_SIGNATURE => '$PnP';
+
+our @EXPORT_OK = qw ( ROM_SIGNATURE PCI_SIGNATURE PNP_SIGNATURE );
+our %EXPORT_TAGS = ( all => [ @EXPORT_OK ] );
+
+use constant JMP_SHORT => 0xeb;
+use constant JMP_NEAR => 0xe9;
+
+sub pack_init {
+ my $dest = shift;
+
+ # Always create a near jump; it's simpler
+ if ( $dest ) {
+ return pack ( "CS", JMP_NEAR, ( $dest - 6 ) );
+ } else {
+ return pack ( "CS", 0, 0 );
+ }
+}
+
+sub unpack_init {
+ my $instr = shift;
+
+ # Accept both short and near jumps
+ my $jump = unpack ( "C", $instr );
+ if ( $jump == JMP_SHORT ) {
+ my $offset = unpack ( "xC", $instr );
+ return ( $offset + 5 );
+ } elsif ( $jump == JMP_NEAR ) {
+ my $offset = unpack ( "xS", $instr );
+ return ( $offset + 6 );
+ } elsif ( $jump == 0 ) {
+ return 0;
+ } else {
+ croak "Unrecognised jump instruction in init vector\n";
+ }
+}
+
+=pod
+
+=item C<< new () >>
+
+Construct a new C<Option::ROM> object.
+
+=cut
+
+sub new {
+ my $class = shift;
+
+ my $hash = {};
+ tie %$hash, "Option::ROM::Fields", {
+ data => undef,
+ offset => 0x00,
+ length => 0x20,
+ fields => {
+ signature => { offset => 0x00, length => 0x02, pack => "S" },
+ length => { offset => 0x02, length => 0x01, pack => "C" },
+ # "init" is part of a jump instruction
+ init => { offset => 0x03, length => 0x03,
+ pack => \&pack_init, unpack => \&unpack_init },
+ checksum => { offset => 0x06, length => 0x01, pack => "C" },
+ bofm_header => { offset => 0x14, length => 0x02, pack => "S" },
+ undi_header => { offset => 0x16, length => 0x02, pack => "S" },
+ pci_header => { offset => 0x18, length => 0x02, pack => "S" },
+ pnp_header => { offset => 0x1a, length => 0x02, pack => "S" },
+ },
+ };
+ bless $hash, $class;
+ return $hash;
+}
+
+=pod
+
+=item C<< load ( $filename ) >>
+
+Load option ROM contents from the file C<$filename>.
+
+=cut
+
+sub load {
+ my $hash = shift;
+ my $self = tied(%$hash);
+ my $filename = shift;
+
+ $self->{filename} = $filename;
+
+ open my $fh, "<$filename"
+ or croak "Cannot open $filename for reading: $!";
+ read $fh, my $data, ( 128 * 1024 ); # 128kB is theoretical max size
+ $self->{data} = \$data;
+ close $fh;
+}
+
+=pod
+
+=item C<< save ( [ $filename ] ) >>
+
+Write the ROM data back out to the file C<$filename>. If C<$filename>
+is omitted, the file used in the call to C<load()> will be used.
+
+=cut
+
+sub save {
+ my $hash = shift;
+ my $self = tied(%$hash);
+ my $filename = shift;
+
+ $filename ||= $self->{filename};
+
+ open my $fh, ">$filename"
+ or croak "Cannot open $filename for writing: $!";
+ print $fh ${$self->{data}};
+ close $fh;
+}
+
+=pod
+
+=item C<< length () >>
+
+Length of option ROM data. This is the length of the file, not the
+length from the ROM header length field.
+
+=cut
+
+sub length {
+ my $hash = shift;
+ my $self = tied(%$hash);
+
+ return length ${$self->{data}};
+}
+
+=pod
+
+=item C<< pci_header () >>
+
+Return a C<Option::ROM::PCI> object representing the ROM's PCI header,
+if present.
+
+=cut
+
+sub pci_header {
+ my $hash = shift;
+ my $self = tied(%$hash);
+
+ my $offset = $hash->{pci_header};
+ return undef unless $offset != 0;
+
+ return Option::ROM::PCI->new ( $self->{data}, $offset );
+}
+
+=pod
+
+=item C<< pnp_header () >>
+
+Return a C<Option::ROM::PnP> object representing the ROM's PnP header,
+if present.
+
+=cut
+
+sub pnp_header {
+ my $hash = shift;
+ my $self = tied(%$hash);
+
+ my $offset = $hash->{pnp_header};
+ return undef unless $offset != 0;
+
+ return Option::ROM::PnP->new ( $self->{data}, $offset );
+}
+
+=pod
+
+=item C<< checksum () >>
+
+Calculate the byte checksum of the ROM.
+
+=cut
+
+sub checksum {
+ my $hash = shift;
+ my $self = tied(%$hash);
+
+ return unpack ( "%8C*", ${$self->{data}} );
+}
+
+=pod
+
+=item C<< fix_checksum () >>
+
+Fix the byte checksum of the ROM.
+
+=cut
+
+sub fix_checksum {
+ my $hash = shift;
+ my $self = tied(%$hash);
+
+ $hash->{checksum} = ( ( $hash->{checksum} - $hash->checksum() ) & 0xff );
+}
+
+##############################################################################
+#
+# Option::ROM::PCI
+#
+##############################################################################
+
+package Option::ROM::PCI;
+
+use strict;
+use warnings;
+use Carp;
+use bytes;
+
+sub new {
+ my $class = shift;
+ my $data = shift;
+ my $offset = shift;
+
+ my $hash = {};
+ tie %$hash, "Option::ROM::Fields", {
+ data => $data,
+ offset => $offset,
+ length => 0x0c,
+ fields => {
+ signature => { offset => 0x00, length => 0x04, pack => "a4" },
+ vendor_id => { offset => 0x04, length => 0x02, pack => "S" },
+ device_id => { offset => 0x06, length => 0x02, pack => "S" },
+ device_list => { offset => 0x08, length => 0x02, pack => "S" },
+ struct_length => { offset => 0x0a, length => 0x02, pack => "S" },
+ struct_revision =>{ offset => 0x0c, length => 0x01, pack => "C" },
+ base_class => { offset => 0x0d, length => 0x01, pack => "C" },
+ sub_class => { offset => 0x0e, length => 0x01, pack => "C" },
+ prog_intf => { offset => 0x0f, length => 0x01, pack => "C" },
+ image_length => { offset => 0x10, length => 0x02, pack => "S" },
+ revision => { offset => 0x12, length => 0x02, pack => "S" },
+ code_type => { offset => 0x14, length => 0x01, pack => "C" },
+ last_image => { offset => 0x15, length => 0x01, pack => "C" },
+ runtime_length => { offset => 0x16, length => 0x02, pack => "S" },
+ conf_header => { offset => 0x18, length => 0x02, pack => "S" },
+ clp_entry => { offset => 0x1a, length => 0x02, pack => "S" },
+ },
+ };
+ bless $hash, $class;
+
+ # Retrieve true length of structure
+ my $self = tied ( %$hash );
+ $self->{length} = $hash->{struct_length};
+
+ return $hash;
+}
+
+##############################################################################
+#
+# Option::ROM::PnP
+#
+##############################################################################
+
+package Option::ROM::PnP;
+
+use strict;
+use warnings;
+use Carp;
+use bytes;
+
+sub new {
+ my $class = shift;
+ my $data = shift;
+ my $offset = shift;
+
+ my $hash = {};
+ tie %$hash, "Option::ROM::Fields", {
+ data => $data,
+ offset => $offset,
+ length => 0x06,
+ fields => {
+ signature => { offset => 0x00, length => 0x04, pack => "a4" },
+ struct_revision =>{ offset => 0x04, length => 0x01, pack => "C" },
+ struct_length => { offset => 0x05, length => 0x01, pack => "C" },
+ checksum => { offset => 0x09, length => 0x01, pack => "C" },
+ manufacturer => { offset => 0x0e, length => 0x02, pack => "S" },
+ product => { offset => 0x10, length => 0x02, pack => "S" },
+ bcv => { offset => 0x16, length => 0x02, pack => "S" },
+ bdv => { offset => 0x18, length => 0x02, pack => "S" },
+ bev => { offset => 0x1a, length => 0x02, pack => "S" },
+ },
+ };
+ bless $hash, $class;
+
+ # Retrieve true length of structure
+ my $self = tied ( %$hash );
+ $self->{length} = ( $hash->{struct_length} * 16 );
+
+ return $hash;
+}
+
+sub checksum {
+ my $hash = shift;
+ my $self = tied(%$hash);
+
+ return $self->checksum();
+}
+
+sub fix_checksum {
+ my $hash = shift;
+ my $self = tied(%$hash);
+
+ $hash->{checksum} = ( ( $hash->{checksum} - $hash->checksum() ) & 0xff );
+}
+
+sub manufacturer {
+ my $hash = shift;
+ my $self = tied(%$hash);
+
+ my $manufacturer = $hash->{manufacturer};
+ return undef unless $manufacturer;
+
+ my $raw = substr ( ${$self->{data}}, $manufacturer );
+ return unpack ( "Z*", $raw );
+}
+
+sub product {
+ my $hash = shift;
+ my $self = tied(%$hash);
+
+ my $product = $hash->{product};
+ return undef unless $product;
+
+ my $raw = substr ( ${$self->{data}}, $product );
+ return unpack ( "Z*", $raw );
+}
+
+1;
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