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[util] Add romcheck.pl
Provide a utility to quickly determine the ROM size and .mrom format support for attached PCI devices. For example: 01:00.0 (1186:4300) supports a 128kB .rom or .mrom Inspired-by: Wes Frazier <wes.frazier@members.fsf.org> Signed-off-by: Michael Brown <mcb30@ipxe.org>
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#!/usr/bin/perl -w | ||
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use strict; | ||
use warnings; | ||
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use constant DEVICES => "/proc/bus/pci/devices"; | ||
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open my $fh, DEVICES | ||
or die "Could not open ".DEVICES.": $!"; | ||
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while ( ( my $line = <$fh> ) ) { | ||
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# Parse line from /proc/bus/pci/devices | ||
chomp $line; | ||
( my $bus, my $devfn, my $vendor, my $device, my $irq, my $bars, my $lengths, | ||
my $driver ) | ||
= ( $line =~ /^ ([0-9a-f]{2}) ([0-9a-f]{2}) \s+ | ||
([0-9a-f]{4}) ([0-9a-f]{4}) \s+ ([0-9a-f]+) \s+ | ||
((?:[0-9a-f]+\s+){7}) ((?:[0-9a-f]+\s+){7}) | ||
(.+)?$/x ) | ||
or die "Invalid line \"".$line."\"\n"; | ||
( $bus, $devfn, $vendor, $device, $irq ) = | ||
map { hex ( $_ ) } ( $bus, $devfn, $vendor, $device, $irq ); | ||
my $dev = ( $devfn >> 3 ); | ||
my $fn = ( $devfn & 0x7 ); | ||
$bars = [ map { hex ( $_ ) } split ( /\s+/, $bars ) ]; | ||
$lengths = [ map { hex ( $_ ) } split ( /\s+/, $lengths ) ]; | ||
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# Calculate expansion ROM BAR presence and length | ||
my $rom_length = $lengths->[6]; | ||
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# Look for a BAR that could support a .mrom | ||
my $mrom_ok; | ||
if ( $rom_length ) { | ||
for ( my $bar = 0 ; $bar < 7 ; $bar++ ) { | ||
# Skip I/O BARs | ||
next if $bars->[$bar] & 0x01; | ||
# Skip low half of 64-bit BARs | ||
$bar++ if $bars->[$bar] & 0x04; | ||
# Skip 64-bit BARs with high dword set | ||
next if $bars->[$bar] >> 32; | ||
# Skip BARs smaller than the expansion ROM BAR | ||
next if $lengths->[$bar] < $rom_length; | ||
# This BAR is usable! | ||
$mrom_ok = 1; | ||
last; | ||
} | ||
} | ||
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printf "%02x:%02x.%x (%04x:%04x)", $bus, $dev, $fn, $vendor, $device; | ||
printf " supports a %dkB .rom", ( $rom_length / 1024 ) if $rom_length; | ||
printf " or .mrom" if $mrom_ok; | ||
printf "\n"; | ||
} |