liminix-fork/kernel/vmlinux.nix
2022-10-16 15:15:18 +01:00

101 lines
3.2 KiB
Nix

{ stdenv
, buildPackages
, runCommand
, writeText
, lib
, config
, checkedConfig ? {}
, tree
} :
let writeConfig = name : config: writeText name
(builtins.concatStringsSep
"\n"
(lib.mapAttrsToList
(name: value: (if value == "n" then "# CONFIG_${name} is not set" else "CONFIG_${name}=${value}"))
config
));
kconfigFile = writeConfig "kconfig" (config // checkedConfig);
# KLUDGE FIXME. some symbols we need to enable in some configurations don't
# have a prompt (!), so we can't turn them on just by adding FOO=y and make oldconfig
#
# (!) yes, that was my reaction too
kconfigLocal = writeText "Kconfig.local" ''
config LIMINIX
prompt "Local symbols"
bool
default y
select SOC_QCA955X
'';
checkedConfigFile = writeConfig "checked_kconfig" checkedConfig ;
inherit lib; in
stdenv.mkDerivation rec {
name = "vmlinux";
hardeningDisable = ["all"];
nativeBuildInputs = [buildPackages.stdenv.cc] ++
(with buildPackages.pkgs;
[rsync bc bison flex pkgconfig openssl ncurses.all perl]);
CC = "${stdenv.cc.bintools.targetPrefix}gcc";
HOSTCC = with buildPackages.pkgs;
"gcc -I${openssl}/include -I${ncurses}/include";
HOST_EXTRACFLAGS = with buildPackages.pkgs;
"-I${openssl.dev}/include -L${openssl.out}/lib -L${ncurses.out}/lib";
PKG_CONFIG_PATH = "./pkgconfig";
CROSS_COMPILE = stdenv.cc.bintools.targetPrefix;
ARCH = "mips"; # kernel uses "mips" here for both mips and mipsel
dontStrip = true;
dontPatchELF = true;
outputs = ["out" "modulesupport"];
phases = [
"butcherPkgconfig"
"configurePhase"
"checkConfigurationPhase"
"buildPhase"
"installPhase"
];
# this is here to work around what I think is a bug in nixpkgs
# packaging of ncurses: it installs pkg-config data files which
# don't produce any -L options when queried with "pkg-config --lib
# ncurses". For a regular build you'll never even notice, this only
# becomes an issue if you do a nix-shell in this derivation and
# expect "make nconfig" to work.
butcherPkgconfig = ''
cp -r ${buildPackages.pkgs.ncurses.dev}/lib/pkgconfig .
chmod +w pkgconfig pkgconfig/*.pc
for i in pkgconfig/*.pc; do test -f $i && sed -i 's/^Libs:/Libs: -L''${libdir} /' $i;done
'';
configurePhase = ''
export KBUILD_OUTPUT=`pwd`
cp ${kconfigFile} .config
cp ${kconfigFile} .config.orig
cp ${kconfigLocal} Kconfig.local
( cd ${tree} && make V=1 olddefconfig )
'';
checkConfigurationPhase = ''
echo Checking required config items:
if comm -2 -3 <(grep 'CONFIG' ${checkedConfigFile} |sort) <(grep 'CONFIG' .config|sort) |grep '.' ; then
echo -e "^^^ Some configuration lost :-(\nPerhaps you have mutually incompatible settings, or have disabled options on which these depend.\n"
exit 0
fi
echo "OK"
'';
KBUILD_BUILD_HOST = "liminix.builder";
buildPhase = ''
make -C ${tree} vmlinux modules_prepare
'';
installPhase = ''
${CROSS_COMPILE}strip -d vmlinux
cp vmlinux $out
mkdir -p $modulesupport
cp .config $modulesupport/config
make clean
cp -a . $modulesupport
'';
}