1 files changed, 226 insertions, 0 deletions
diff --git a/roms/ipxe/src/util/modrom.pl b/roms/ipxe/src/util/modrom.pl
new file mode 100755
index 00000000..cdac0b97
--- /dev/null
+++ b/roms/ipxe/src/util/modrom.pl
@@ -0,0 +1,226 @@
+#!/usr/bin/perl -w
+
+use Getopt::Std;
+
+use constant MINROMSIZE => 8192;
+use constant MAXROMSIZE => 262144;
+
+use constant PCI_PTR_LOC => 0x18;	# from beginning of ROM
+use constant PCI_HDR_SIZE => 0x18;
+use constant PNP_PTR_LOC => 0x1a;	# from beginning of ROM
+use constant PNP_HDR_SIZE => 0x20;
+use constant PNP_CHKSUM_OFF => 0x9;	# bytes from beginning of PnP header
+use constant PNP_DEVICE_OFF => 0x10;	# bytes from beginning of PnP header
+use constant PCI_VEND_ID_OFF => 0x4;	# bytes from beginning of PCI header
+use constant PCI_DEV_ID_OFF => 0x6;	# bytes from beginning of PCI header
+use constant PCI_SIZE_OFF => 0x10;	# bytes from beginning of PCI header
+
+use constant UNDI_PTR_LOC => 0x16;	# from beginning of ROM
+use constant UNDI_HDR_SIZE => 0x16;
+use constant UNDI_CHKSUM_OFF => 0x05;
+
+use strict;
+
+use vars qw(%opts);
+
+use bytes;
+
+sub getromsize ($) {
+	my ($romref) = @_;
+	my $i;
+
+	print STDERR "BIOS extension ROM Image did not start with 0x55 0xAA\n"
+		if (substr($$romref, 0, 2) ne "\x55\xaa");
+	my $size = ord(substr($$romref, 2, 1)) * 512;
+	for ($i = MINROMSIZE; $i < MAXROMSIZE and $i < $size; $i *= 2) { }
+	print STDERR "$size is a strange size for a boot ROM\n"
+		if ($size > 0 and $i > $size);
+	return ($size);
+}
+
+sub addident ($) {
+	my ($romref) = @_;
+
+	return (0) unless (my $s = $opts{'i'});
+	# include the terminating NUL byte too
+	$s .= "\x00";
+	my $len = length($s);
+	# Put the identifier in only if the space is blank
+	my $pos = length($$romref) - $len - 2;
+	return (0) if (substr($$romref, $pos, $len) ne ("\xFF" x $len));
+	substr($$romref, $pos, $len) = $s;
+	return ($pos);
+}
+
+sub pcipnpheaders ($$) {
+	my ($romref, $identoffset) = @_;
+	my ($pci_hdr_offset, $pnp_hdr_offset);
+
+	$pci_hdr_offset = unpack('v', substr($$romref, PCI_PTR_LOC, 2));
+	$pnp_hdr_offset = unpack('v', substr($$romref, PNP_PTR_LOC, 2));
+	# Sanity checks
+	if ($pci_hdr_offset < PCI_PTR_LOC + 2
+		or $pci_hdr_offset > length($$romref) - PCI_HDR_SIZE
+		or $pnp_hdr_offset < PNP_PTR_LOC + 2
+		or $pnp_hdr_offset > length($$romref) - PNP_HDR_SIZE
+		or substr($$romref, $pci_hdr_offset, 4) ne 'PCIR'
+		or substr($$romref, $pnp_hdr_offset, 4) ne '$PnP') {
+		$pci_hdr_offset = $pnp_hdr_offset = 0;
+	} else {
+		printf "PCI header at %#x and PnP header at %#x\n",
+			$pci_hdr_offset, $pnp_hdr_offset;
+	}
+	if ($pci_hdr_offset > 0) {
+		my ($pci_vendor_id, $pci_device_id);
+		# if no -p option, just report what's there
+		if (!defined($opts{'p'})) {
+			$pci_vendor_id = unpack('v', substr($$romref, $pci_hdr_offset+PCI_VEND_ID_OFF, 2));
+			$pci_device_id = unpack('v', substr($$romref, $pci_hdr_offset+PCI_DEV_ID_OFF, 2));
+			printf "PCI Vendor ID %#x Device ID %#x\n",
+				$pci_vendor_id, $pci_device_id;
+		} else {
+			substr($$romref, $pci_hdr_offset + PCI_SIZE_OFF, 2)
+				= pack('v', length($$romref) / 512);
+			($pci_vendor_id, $pci_device_id) = split(/,/, $opts{'p'});
+			substr($$romref, $pci_hdr_offset+PCI_VEND_ID_OFF, 2)
+				= pack('v', oct($pci_vendor_id)) if ($pci_vendor_id);
+			substr($$romref, $pci_hdr_offset+PCI_DEV_ID_OFF, 2)
+				= pack('v', oct($pci_device_id)) if ($pci_device_id);
+		}
+	}
+	if ($pnp_hdr_offset > 0 and defined($identoffset)) {
+		# Point to device id string at end of ROM image
+		substr($$romref, $pnp_hdr_offset+PNP_DEVICE_OFF, 2)
+			= pack('v', $identoffset);
+		substr($$romref, $pnp_hdr_offset+PNP_CHKSUM_OFF, 1) = "\x00";
+		my $sum = unpack('%8C*', substr($$romref, $pnp_hdr_offset,
+			PNP_HDR_SIZE));
+		substr($$romref, $pnp_hdr_offset+PNP_CHKSUM_OFF, 1) = chr(256 - $sum);
+	}
+}
+
+sub undiheaders ($) {
+	my ($romref) = @_;
+	my ($undi_hdr_offset);
+
+	$undi_hdr_offset = unpack('v', substr($$romref, UNDI_PTR_LOC, 2));
+	# Sanity checks
+	if ($undi_hdr_offset < UNDI_PTR_LOC + 2
+		or $undi_hdr_offset > length($$romref) - UNDI_HDR_SIZE
+		or substr($$romref, $undi_hdr_offset, 4) ne 'UNDI') {
+		$undi_hdr_offset = 0;
+	} else {
+		printf "UNDI header at %#x\n", $undi_hdr_offset;
+	}
+	if ($undi_hdr_offset > 0) {
+		substr($$romref, $undi_hdr_offset+UNDI_CHKSUM_OFF, 1) = "\x00";
+		my $sum = unpack('%8C*', substr($$romref, $undi_hdr_offset,
+			UNDI_HDR_SIZE));
+		substr($$romref, $undi_hdr_offset+UNDI_CHKSUM_OFF, 1) = chr(256 - $sum);
+	}
+}
+
+sub writerom ($$) {
+	my ($filename, $romref) = @_;
+
+	open(R, ">$filename") or die "$filename: $!\n";
+	print R $$romref;
+	close(R);
+}
+
+sub checksum ($) {
+	my ($romref) = @_;
+
+	substr($$romref, 6, 1) = "\x00";
+	my $sum = unpack('%8C*', $$romref);
+	substr($$romref, 6, 1) = chr(256 - $sum);
+	# Double check
+	$sum = unpack('%8C*', $$romref);
+	if ($sum != 0) {
+		print "Checksum fails\n"
+	} elsif ($opts{'v'}) {
+		print "Checksum ok\n";
+	}
+}
+
+sub makerom () {
+	my ($rom, $romsize);
+
+	getopts('3xi:p:s:v', \%opts);
+	$ARGV[0] or die "Usage: $0 [-s romsize] [-i ident] [-p vendorid,deviceid] [-x] [-3] rom-file\n";
+	open(R, $ARGV[0]) or die "$ARGV[0]: $!\n";
+	# Read in the whole ROM in one gulp
+	my $filesize = read(R, $rom, MAXROMSIZE+1);
+	close(R);
+	defined($filesize) and $filesize >= 3 or die "Cannot get first 3 bytes of file\n";
+	print "$filesize bytes read\n" if $opts{'v'};
+	# If PXE image, just fill the length field and write it out
+	if ($opts{'x'}) {
+		substr($rom, 2, 1) = chr((length($rom) + 511) / 512);
+		&writerom($ARGV[0], \$rom);
+		return;
+	}
+	# Size specified with -s overrides value in 3rd byte in image
+	# -s 0 means round up to next 512 byte block
+	if (defined($opts{'s'})) {
+		if (($romsize = oct($opts{'s'})) <= 0) {
+			# NB: This roundup trick only works on powers of 2
+			$romsize = ($filesize + 511) & ~511
+		}
+	} else {
+		$romsize = &getromsize(\$rom);
+		# 0 put there by *loader.S means makerom should pick the size
+		if ($romsize == 0) {
+			# Shrink romsize down to the smallest power of two that will do
+			for ($romsize = MAXROMSIZE;
+				$romsize > MINROMSIZE and $romsize >= 2*$filesize;
+				$romsize /= 2) { }
+		}
+	}
+	if ($filesize > $romsize) {
+		print STDERR "ROM size of $romsize not big enough for data, ";
+		# NB: This roundup trick only works on powers of 2
+		$romsize = ($filesize + 511) & ~511;
+		print "will use $romsize instead\n"
+	}
+	# Pad with 0xFF to $romsize
+	$rom .= "\xFF" x ($romsize - length($rom));
+	if ($romsize >= 128 * 1024) {
+		print "Warning: ROM size exceeds extension BIOS limit\n";
+	}
+	substr($rom, 2, 1) = chr(($romsize / 512) % 256);
+	print "ROM size is $romsize\n" if $opts{'v'};
+	my $identoffset = &addident(\$rom);
+	&pcipnpheaders(\$rom, $identoffset);
+	&undiheaders(\$rom);
+	# 3c503 requires last two bytes to be 0x80
+	substr($rom, MINROMSIZE-2, 2) = "\x80\x80"
+		if ($opts{'3'} and $romsize == MINROMSIZE);
+	&checksum(\$rom);
+	&writerom($ARGV[0], \$rom);
+}
+
+sub modrom () {
+	my ($rom);
+
+	getopts('p:v', \%opts);
+	$ARGV[0] or die "Usage: $0 [-p vendorid,deviceid] rom-file\n";
+	open(R, $ARGV[0]) or die "$ARGV[0]: $!\n";
+	# Read in the whole ROM in one gulp
+	my $filesize = read(R, $rom, MAXROMSIZE+1);
+	close(R);
+	defined($filesize) and $filesize >= 3 or die "Cannot get first 3 bytes of file\n";
+	print "$filesize bytes read\n" if $opts{'v'};
+	&pcipnpheaders(\$rom);
+	&undiheaders(\$rom);
+	&checksum(\$rom);
+	&writerom($ARGV[0], \$rom);
+}
+
+# Main routine. See how we were called and behave accordingly
+if ($0 =~ m:modrom(\.pl)?$:) {
+	&modrom();
+} else {
+	&makerom();
+}
+exit(0);