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@@ -0,0 +1,54 @@
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+#!/usr/bin/perl -w
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+
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+use strict;
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+use warnings;
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+
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+use constant DEVICES => "/proc/bus/pci/devices";
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+
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+open my $fh, DEVICES
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+ or die "Could not open ".DEVICES.": $!";
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+
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+while ( ( my $line = <$fh> ) ) {
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+
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+ # Parse line from /proc/bus/pci/devices
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+ chomp $line;
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+ ( my $bus, my $devfn, my $vendor, my $device, my $irq, my $bars, my $lengths,
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+ my $driver )
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+ = ( $line =~ /^ ([0-9a-f]{2}) ([0-9a-f]{2}) \s+
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+ ([0-9a-f]{4}) ([0-9a-f]{4}) \s+ ([0-9a-f]+) \s+
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+ ((?:[0-9a-f]+\s+){7}) ((?:[0-9a-f]+\s+){7})
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+ (.+)?$/x )
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+ or die "Invalid line \"".$line."\"\n";
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+ ( $bus, $devfn, $vendor, $device, $irq ) =
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+ map { hex ( $_ ) } ( $bus, $devfn, $vendor, $device, $irq );
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+ my $dev = ( $devfn >> 3 );
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+ my $fn = ( $devfn & 0x7 );
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+ $bars = [ map { hex ( $_ ) } split ( /\s+/, $bars ) ];
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+ $lengths = [ map { hex ( $_ ) } split ( /\s+/, $lengths ) ];
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+
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+ # Calculate expansion ROM BAR presence and length
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+ my $rom_length = $lengths->[6];
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+
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+ # Look for a BAR that could support a .mrom
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+ my $mrom_ok;
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+ if ( $rom_length ) {
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+ for ( my $bar = 0 ; $bar < 7 ; $bar++ ) {
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+ # Skip I/O BARs
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+ next if $bars->[$bar] & 0x01;
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+ # Skip low half of 64-bit BARs
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+ $bar++ if $bars->[$bar] & 0x04;
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+ # Skip 64-bit BARs with high dword set
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+ next if $bars->[$bar] >> 32;
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+ # Skip BARs smaller than the expansion ROM BAR
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+ next if $lengths->[$bar] < $rom_length;
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+ # This BAR is usable!
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+ $mrom_ok = 1;
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+ last;
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+ }
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+ }
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+
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+ printf "%02x:%02x.%x (%04x:%04x)", $bus, $dev, $fn, $vendor, $device;
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+ printf " supports a %dkB .rom", ( $rom_length / 1024 ) if $rom_length;
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+ printf " or .mrom" if $mrom_ok;
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+ printf "\n";
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+}
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