mirror of https://github.com/ipxe/ipxe.git
55 lines
1.6 KiB
Perl
55 lines
1.6 KiB
Perl
#!/usr/bin/perl -w
|
|
|
|
use strict;
|
|
use warnings;
|
|
|
|
use constant DEVICES => "/proc/bus/pci/devices";
|
|
|
|
open my $fh, DEVICES
|
|
or die "Could not open ".DEVICES.": $!";
|
|
|
|
while ( ( my $line = <$fh> ) ) {
|
|
|
|
# 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 ) ];
|
|
|
|
# Calculate expansion ROM BAR presence and length
|
|
my $rom_length = $lengths->[6];
|
|
|
|
# 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;
|
|
}
|
|
}
|
|
|
|
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";
|
|
}
|