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https://github.com/ipxe/ipxe
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[build] Replace obsolete makerom.pl with quick script using Option::ROM
The only remaining useful function of makerom.pl is to correct the ROM and PnP checksums; the PCI IDs are set at link time, and padding is performed using padimg.pl. Option::ROM already provides a facility for correcting the checksums, so we may as well just use this instead. Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
34
src/util/fixrom.pl
Executable file
34
src/util/fixrom.pl
Executable file
@@ -0,0 +1,34 @@
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#!/usr/bin/perl -w
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#
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# Copyright (C) 2010 Michael Brown <mbrown@fensystems.co.uk>.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of the
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# License, or any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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use strict;
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use warnings;
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use FindBin;
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use lib "$FindBin::Bin";
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use Option::ROM qw ( :all );
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my @romfiles = @ARGV;
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foreach my $romfile ( @romfiles ) {
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my $rom = new Option::ROM;
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$rom->load ( $romfile );
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$rom->pnp_header->fix_checksum() if $rom->pnp_header;
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$rom->fix_checksum();
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$rom->save ( $romfile );
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}
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@@ -1,226 +0,0 @@
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#!/usr/bin/perl -w
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use Getopt::Std;
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use constant MINROMSIZE => 8192;
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use constant MAXROMSIZE => 262144;
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use constant PCI_PTR_LOC => 0x18; # from beginning of ROM
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use constant PCI_HDR_SIZE => 0x18;
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use constant PNP_PTR_LOC => 0x1a; # from beginning of ROM
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use constant PNP_HDR_SIZE => 0x20;
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use constant PNP_CHKSUM_OFF => 0x9; # bytes from beginning of PnP header
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use constant PNP_DEVICE_OFF => 0x10; # bytes from beginning of PnP header
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use constant PCI_VEND_ID_OFF => 0x4; # bytes from beginning of PCI header
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use constant PCI_DEV_ID_OFF => 0x6; # bytes from beginning of PCI header
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use constant PCI_SIZE_OFF => 0x10; # bytes from beginning of PCI header
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use constant UNDI_PTR_LOC => 0x16; # from beginning of ROM
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use constant UNDI_HDR_SIZE => 0x16;
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use constant UNDI_CHKSUM_OFF => 0x05;
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use strict;
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use vars qw(%opts);
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use bytes;
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sub getromsize ($) {
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my ($romref) = @_;
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my $i;
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print STDERR "BIOS extension ROM Image did not start with 0x55 0xAA\n"
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if (substr($$romref, 0, 2) ne "\x55\xaa");
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my $size = ord(substr($$romref, 2, 1)) * 512;
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for ($i = MINROMSIZE; $i < MAXROMSIZE and $i < $size; $i *= 2) { }
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print STDERR "$size is a strange size for a boot ROM\n"
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if ($size > 0 and $i > $size);
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return ($size);
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}
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sub addident ($) {
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my ($romref) = @_;
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return (0) unless (my $s = $opts{'i'});
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# include the terminating NUL byte too
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$s .= "\x00";
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my $len = length($s);
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# Put the identifier in only if the space is blank
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my $pos = length($$romref) - $len - 2;
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return (0) if (substr($$romref, $pos, $len) ne ("\xFF" x $len));
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substr($$romref, $pos, $len) = $s;
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return ($pos);
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}
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sub pcipnpheaders ($$) {
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my ($romref, $identoffset) = @_;
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my ($pci_hdr_offset, $pnp_hdr_offset);
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$pci_hdr_offset = unpack('v', substr($$romref, PCI_PTR_LOC, 2));
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$pnp_hdr_offset = unpack('v', substr($$romref, PNP_PTR_LOC, 2));
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# Sanity checks
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if ($pci_hdr_offset < PCI_PTR_LOC + 2
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or $pci_hdr_offset > length($$romref) - PCI_HDR_SIZE
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or $pnp_hdr_offset < PNP_PTR_LOC + 2
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or $pnp_hdr_offset > length($$romref) - PNP_HDR_SIZE
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or substr($$romref, $pci_hdr_offset, 4) ne 'PCIR'
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or substr($$romref, $pnp_hdr_offset, 4) ne '$PnP') {
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$pci_hdr_offset = $pnp_hdr_offset = 0;
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} else {
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printf "PCI header at %#x and PnP header at %#x\n",
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$pci_hdr_offset, $pnp_hdr_offset if $opts{'v'};
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}
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if ($pci_hdr_offset > 0) {
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my ($pci_vendor_id, $pci_device_id);
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# if no -p option, just report what's there
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if (!defined($opts{'p'})) {
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$pci_vendor_id = unpack('v', substr($$romref, $pci_hdr_offset+PCI_VEND_ID_OFF, 2));
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$pci_device_id = unpack('v', substr($$romref, $pci_hdr_offset+PCI_DEV_ID_OFF, 2));
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printf "PCI Vendor ID %#x Device ID %#x\n",
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$pci_vendor_id, $pci_device_id;
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} else {
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substr($$romref, $pci_hdr_offset + PCI_SIZE_OFF, 2)
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= pack('v', length($$romref) / 512);
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($pci_vendor_id, $pci_device_id) = split(/,/, $opts{'p'});
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substr($$romref, $pci_hdr_offset+PCI_VEND_ID_OFF, 2)
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= pack('v', oct($pci_vendor_id)) if ($pci_vendor_id);
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substr($$romref, $pci_hdr_offset+PCI_DEV_ID_OFF, 2)
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= pack('v', oct($pci_device_id)) if ($pci_device_id);
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}
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}
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if ($pnp_hdr_offset > 0) {
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if (defined($identoffset)) {
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# Point to device id string at end of ROM image
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substr($$romref, $pnp_hdr_offset+PNP_DEVICE_OFF, 2)
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= pack('v', $identoffset);
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}
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substr($$romref, $pnp_hdr_offset+PNP_CHKSUM_OFF, 1) = "\x00";
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my $sum = unpack('%8C*', substr($$romref, $pnp_hdr_offset,
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PNP_HDR_SIZE));
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substr($$romref, $pnp_hdr_offset+PNP_CHKSUM_OFF, 1) = chr(256 - $sum);
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}
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}
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sub undiheaders ($) {
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my ($romref) = @_;
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my ($undi_hdr_offset);
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$undi_hdr_offset = unpack('v', substr($$romref, UNDI_PTR_LOC, 2));
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# Sanity checks
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if ($undi_hdr_offset < UNDI_PTR_LOC + 2
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or $undi_hdr_offset > length($$romref) - UNDI_HDR_SIZE
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or substr($$romref, $undi_hdr_offset, 4) ne 'UNDI') {
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$undi_hdr_offset = 0;
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} else {
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printf "UNDI header at %#x\n", $undi_hdr_offset if $opts{'v'};
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}
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if ($undi_hdr_offset > 0) {
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substr($$romref, $undi_hdr_offset+UNDI_CHKSUM_OFF, 1) = "\x00";
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my $sum = unpack('%8C*', substr($$romref, $undi_hdr_offset,
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UNDI_HDR_SIZE));
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substr($$romref, $undi_hdr_offset+UNDI_CHKSUM_OFF, 1) = chr(256 - $sum);
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}
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}
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sub writerom ($$) {
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my ($filename, $romref) = @_;
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open(R, ">$filename") or die "$filename: $!\n";
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print R $$romref;
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close(R);
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}
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sub checksum ($) {
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my ($romref) = @_;
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substr($$romref, 6, 1) = "\x00";
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my $sum = unpack('%8C*', $$romref);
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substr($$romref, 6, 1) = chr(256 - $sum);
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# Double check
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$sum = unpack('%8C*', $$romref);
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if ($sum != 0) {
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print "Checksum fails\n"
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} elsif ($opts{'v'}) {
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print "Checksum ok\n";
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}
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}
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sub makerom () {
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my ($rom, $romsize);
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getopts('3xi:p:s:v', \%opts);
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$ARGV[0] or die "Usage: $0 [-s romsize] [-i ident] [-p vendorid,deviceid] [-x] [-3] rom-file\n";
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open(R, $ARGV[0]) or die "$ARGV[0]: $!\n";
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# Read in the whole ROM in one gulp
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my $filesize = read(R, $rom, MAXROMSIZE+1);
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close(R);
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defined($filesize) and $filesize >= 3 or die "Cannot get first 3 bytes of file\n";
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print "$filesize bytes read\n" if $opts{'v'};
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# If PXE image, just fill the length field and write it out
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if ($opts{'x'}) {
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substr($rom, 2, 1) = chr((length($rom) + 511) / 512);
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writerom($ARGV[0], \$rom);
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return;
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}
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# Size specified with -s overrides value in 3rd byte in image
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# -s 0 means round up to next 512 byte block
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if (defined($opts{'s'})) {
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if (($romsize = oct($opts{'s'})) <= 0) {
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# NB: This roundup trick only works on powers of 2
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$romsize = ($filesize + 511) & ~511
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}
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} else {
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# Shrink romsize down to the smallest power of two that will do
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for ($romsize = MAXROMSIZE;
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$romsize > MINROMSIZE and $romsize >= 2*$filesize;
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$romsize /= 2) { }
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}
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if ($filesize > $romsize) {
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print STDERR "ROM size of $romsize not big enough for data, ";
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# NB: This roundup trick only works on powers of 2
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$romsize = ($filesize + 511) & ~511;
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print "will use $romsize instead\n"
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}
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# Pad with 0xFF to $romsize
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$rom .= "\xFF" x ($romsize - length($rom));
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if ($romsize >= 128 * 1024) {
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print "Warning: ROM size exceeds extension BIOS limit\n";
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}
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substr($rom, 2, 1) = chr(($romsize / 512) % 256);
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print "ROM size is $romsize\n" if $opts{'v'};
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# set the product string only if we don't have one yet
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my $pnp_hdr_offset = unpack('v', substr($rom, PNP_PTR_LOC, 2));
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my $identoffset = substr($rom, $pnp_hdr_offset+PNP_DEVICE_OFF, 2) eq "\0\0" ? addident(\$rom) : undef;
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pcipnpheaders(\$rom, $identoffset);
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undiheaders(\$rom);
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# 3c503 requires last two bytes to be 0x80
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substr($rom, MINROMSIZE-2, 2) = "\x80\x80"
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if ($opts{'3'} and $romsize == MINROMSIZE);
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checksum(\$rom);
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writerom($ARGV[0], \$rom);
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}
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sub modrom () {
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my ($rom);
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getopts('p:v', \%opts);
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$ARGV[0] or die "Usage: $0 [-p vendorid,deviceid] rom-file\n";
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open(R, $ARGV[0]) or die "$ARGV[0]: $!\n";
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# Read in the whole ROM in one gulp
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my $filesize = read(R, $rom, MAXROMSIZE+1);
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close(R);
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defined($filesize) and $filesize >= 3 or die "Cannot get first 3 bytes of file\n";
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print "$filesize bytes read\n" if $opts{'v'};
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pcipnpheaders(\$rom, undef);
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undiheaders(\$rom);
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checksum(\$rom);
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writerom($ARGV[0], \$rom);
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}
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# Main routine. See how we were called and behave accordingly
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if ($0 =~ m:modrom(\.pl)?$:) {
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modrom();
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} else {
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makerom();
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}
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exit(0);
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