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* A program for generating the hardware-specific bits of

Browse source 
configuration.nix.  Right now it finds out the following:

  - How many CPUs the machine has (for nix.maxJobs).
  - Whether to load KVM support (either kvm-intel or kvm-amd).
  - The modules necessary for the initrd by scanning the PCI and USB
    busses.  Only mass-storage and HID related modules are added.

svn path=/nixos/trunk/; revision=10221
This commit is contained in:
Eelco Dolstra 2008-01-18 16:17:48 +00:00
parent 86484779c7
commit fcef0545be
1 changed files with 144 additions and 0 deletions
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144
installer/nixos-hardware-scan.sh Normal file
View file

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#! @shell@ -e
kernelModules=
initrdKernelModules=
hasCPUFeature() {
local feature="$1"
cat /proc/cpuinfo | grep -q "^flags.* $feature\( \|$\)"
}
needKernelModule() {
kernelModules="$kernelModules \"$1\""
}
needInitrdKernelModule() {
initrdKernelModules="$initrdKernelModules \"$1\""
}
# Detect the number of CPU cores.
cpus="$(cat /proc/cpuinfo | grep '^processor' | wc -l)"
# CPU frequency scaling. Not sure about this test.
if hasCPUFeature "acpi"; then
needKernelModule "acpi-cpufreq"
fi
# Virtualization support?
if hasCPUFeature "vmx"; then
needKernelModule "kvm-intel"
fi
if hasCPUFeature "svm"; then
needKernelModule "kvm-amd"
fi
# 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.
pciCheck() {
local path="$1"
local vendor="$(cat $path/vendor)"
local device="$(cat $path/device)"
local class="$(cat $path/class)"
local module
if test -e "$path/driver/module"; then
module=$(basename $(readlink -f $path/driver/module))
fi
echo "$path: $vendor $device $class $module"
if test -n "$module"; then
# See the bottom of http://pciids.sourceforge.net/pci.ids for
# device classes.
case $class in
0x01*)
# Mass-storage controller. Definitely important.
needInitrdKernelModule $module
;;
0x0c00*)
# Firewire controller. A disk might be attached.
needInitrdKernelModule $module
;;
0x0c03*)
# USB controller. Needed if we want to use the
# keyboard when things go wrong in the initrd.
needInitrdKernelModule $module
;;
esac
fi
}
for path in /sys/bus/pci/devices/*; do
pciCheck "$path"
done
# Idem for USB devices.
usbCheck() {
local path="$1"
local class="$(cat $path/bInterfaceClass)"
local subclass="$(cat $path/bInterfaceSubClass)"
local protocol="$(cat $path/bInterfaceProtocol)"
local module
if test -e "$path/driver/module"; then
module=$(basename $(readlink -f $path/driver/module))
fi
echo "$path: $class $subclass $protocol $module"
if test -n "$module"; then
# See http://www.linux-usb.org/usb.ids for
# classes/subclasses/protocols.
case $class:$subclass:$protocol in
08:*)
# Mass-storage controller. Definitely important.
needInitrdKernelModule $module
;;
03:*:01)
# Keyboard. Needed if we want to use the
# keyboard when things go wrong in the initrd.
needInitrdKernelModule $module
;;
esac
fi
}
for path in /sys/bus/usb/devices/*; do
if test -e "$path/bInterfaceClass"; then
usbCheck "$path"
fi
done
# Remove duplicate modules. !!! preserve order
kernelModules=$(for i in $kernelModules; do echo $i; done | sort | uniq)
initrdKernelModules=$(for i in $initrdKernelModules; do echo $i; done | sort | uniq)
# Generation the configuration file.
cat <<EOF
# This is a generated file. Do not modify!
# Make changes to /etc/nixos/configuration.nix instead.
{
boot = {
initrd = {
extraKernelModules = [ $(echo $initrdKernelModules) ];
};
kernelModules = [ $(echo $kernelModules) ];
};
nix = {
maxJobs = $cpus;
};
}
EOF