Ed Sweetman <[email protected]> writes:
> What are you supposed to do though if you dont have that bios option.
> And if the bios wasn't changed between kernel version upgrades, what
> is the PCI irq subsystem doing now that requires such a change? And
> what makes it possible to remove the problem with reverting just the
> 8139too driver ... There is a quirk here, but the fix should be in
> the kernel, since not all bios' allow you to make the fix yourself.
Can you post the detail? (/proc/interrupt, mptable, 8259A.pl, lspci -vvv)
--
OGAWA Hirofumi <[email protected]>
#!/usr/bin/perl
#
# 8259A
#
use strict;
use warnings;
use Getopt::Std;
sub outb
{
my $data = shift;
my $port = shift;
open(IO, "> /dev/port") || die;
sysseek(IO, $port, 0) || die;
my $x = pack("C", $data);
syswrite(IO, $x, 1);
close(IO);
}
sub inb
{
my $port = shift;
my $data;
open(IO, "/dev/port") || die;
sysseek(IO, $port, 0) || die;
sysread(IO, $data, 1);
close(IO);
return unpack("C", $data);
}
sub set_edge_level
{
my $irq = shift;
my $to = shift;
my $mask = 1 << ($irq & 7);
my $port = 0x4d0 + ($irq >> 3);
my $val = inb($port);
if ($to eq "edge") {
outb($val & ~$mask, $port);
} else {
outb($val | $mask, $port);
}
print "irq $irq: -> $to\n";
}
our($opt_e, $opt_l);
getopts('e:l:');
if ($opt_e and ($opt_e < 15)) {
set_edge_level($opt_e, "edge");
} elsif ($opt_l and ($opt_l < 15)) {
set_edge_level($opt_l, "level");
}
foreach my $irq (0..15) {
my $mask = 1 << ($irq & 7);
my $port = 0x4d0 + ($irq >> 3);
my $val = inb($port);
printf "irq %d: %02x, %s\n", $irq, $val, ($val & $mask) ? "level" : "edge";
}
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