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#! @perl@ -w
use File::Spec;
use File::Basename;
my @kernelModules = ();
my @initrdKernelModules = ();
# Read a file, returning undef if the file cannot be opened.
sub readFile {
my $filename = shift;
my $res;
if (open FILE, "<$filename") {
my $prev = $/;
undef $/;
$res = <FILE>;
$/ = $prev;
close FILE;
chomp $res;
}
return $res;
}
my $cpuinfo = readFile "/proc/cpuinfo";
sub hasCPUFeature {
my $feature = shift;
return $cpuinfo =~ /^flags\s*:.* $feature( |$)/m;
}
# Detect the number of CPU cores.
my $cpus = scalar (grep {/^processor\s*:/} (split '\n', $cpuinfo));
# CPU frequency scaling. Not sure about this test.
push @kernelModules, "acpi-cpufreq" if hasCPUFeature "acpi";
# Virtualization support?
push @kernelModules, "kvm-intel" if hasCPUFeature "vmx";
push @kernelModules, "kvm-amd" if hasCPUFeature "svm";
# Look at the PCI devices and add necessary modules. Note that most
# modules are auto-detected so we don't need to list them here.
# However, some are needed in the initrd to boot the system.
my $enableIntel2200BGFirmware = "false";
my $enableIntel3945ABGFirmware = "false";
my $videoDriver = "vesa";
sub pciCheck {
my $path = shift;
my $vendor = readFile "$path/vendor";
my $device = readFile "$path/device";
my $class = readFile "$path/class";
my $module;
if (-e "$path/driver/module") {
$module = basename `readlink -f $path/driver/module`;
chomp $module;
}
print STDERR "$path: $vendor $device $class";
print STDERR " $module" if defined $module;
print STDERR "\n";
if (defined $module) {
# See the bottom of http://pciids.sourceforge.net/pci.ids for
# device classes.
if (# Mass-storage controller. Definitely important.
$class =~ /^0x01/ ||
# Firewire controller. A disk might be attached.
$class =~ /^0x0c00/ ||
# USB controller. Needed if we want to use the
# keyboard when things go wrong in the initrd.
$class =~ /^0x0c03/
)
{
push @initrdKernelModules, $module;
}
}
# Can't rely on $module here, since the module may not be loaded
# due to missing firmware. Ideally we would check modules.pcimap
# here.
$enableIntel2200BGFirmware = "true" if $vendor eq "0x8086" &&
($device eq "0x1043" || $device eq "0x104f" || $device eq "0x4220" ||
$device eq "0x4221" || $device eq "0x4223" || $device eq "0x4224");
$enableIntel3945ABGFirmware = "true" if $vendor eq "0x8086" &&
($device eq "0x4229" || $device eq "0x4230" ||
$device eq "0x4222" || $device eq "0x4227");
# Hm, can we extract the PCI ids supported by X drivers somehow?
# cf. http://www.calel.org/pci-devices/xorg-device-list.html
$videoDriver = "i810" if $vendor eq "0x8086" &&
($device eq "0x1132" ||
$device eq "0x2572" ||
$device eq "0x2592" ||
$device eq "0x2772" ||
$device eq "0x2776" ||
$device eq "0x2782" ||
$device eq "0x2792" ||
$device eq "0x2792" ||
$device eq "0x27a2" ||
$device eq "0x27a6" ||
$device eq "0x29a2" ||
$device eq "0x3582" ||
$device eq "0x7121" ||
$device eq "0x7123" ||
$device eq "0x7125" ||
$device eq "0x7128"
);
# Assume that all NVIDIA cards are supported by the NVIDIA driver.
# There may be exceptions (e.g. old cards).
$videoDriver = "nvidia" if $vendor eq "0x10de" && $class =~ /^0x03/;
}
foreach my $path (glob "/sys/bus/pci/devices/*") {
pciCheck $path;
}
# Idem for USB devices.
sub usbCheck {
my $path = shift;
my $class = readFile "$path/bInterfaceClass";
my $subclass = readFile "$path/bInterfaceSubClass";
my $protocol = readFile "$path/bInterfaceProtocol";
my $module;
if (-e "$path/driver/module") {
$module = basename `readlink -f $path/driver/module`;
chomp $module;
}
print STDERR "$path: $class $subclass $protocol";
print STDERR " $module" if defined $module;
print STDERR "\n";
if (defined $module) {
if (# Mass-storage controller. Definitely important.
$class eq "08" ||
# Keyboard. Needed if we want to use the
# keyboard when things go wrong in the initrd.
($class eq "03" && $protocol eq "01")
)
{
push @initrdKernelModules, $module;
}
}
}
foreach my $path (glob "/sys/bus/usb/devices/*") {
if (-e "$path/bInterfaceClass") {
usbCheck $path;
}
}
# Generate the configuration file.
sub removeDups {
my %seen;
my @res = ();
foreach my $s (@_) {
if (!defined $seen{$s}) {
$seen{$s} = "";
push @res, $s;
}
}
return @res;
}
sub toNixExpr {
my $res = "";
foreach my $s (@_) {
$res .= " \"$s\"";
}
return $res;
}
my $initrdKernelModules = toNixExpr(removeDups @initrdKernelModules);
my $kernelModules = toNixExpr(removeDups @kernelModules);
print <<EOF ;
# This is a generated file. Do not modify!
# Make changes to /etc/nixos/configuration.nix instead.
{
boot = {
initrd = {
extraKernelModules = [ $initrdKernelModules ];
};
kernelModules = [ $kernelModules ];
};
nix = {
maxJobs = $cpus;
};
networking = {
enableIntel3945ABGFirmware = $enableIntel3945ABGFirmware;
# Warning: setting this option to `true' requires acceptance of the
# firmware license, see http://ipw2200.sourceforge.net/firmware.php?fid=7.
enableIntel2200BGFirmware = $enableIntel2200BGFirmware;
};
services = {
xserver = {
videoDriver = "$videoDriver";
};
};
}
EOF
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