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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| #!/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"; | ||
| } |