about summary refs log tree commit diff
path: root/pkgs/os-specific/linux/kernel/generic.nix
blob: e6e1bd842363a1f80612c7531447c8c2f59107d7 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
{ buildPackages
, callPackage
, perl
, bison ? null
, flex ? null
, gmp ? null
, libmpc ? null
, mpfr ? null
, stdenv

, # The kernel source tarball.
  src

, # The kernel version.
  version

, # Allows overriding the default defconfig
  defconfig ? null

, # Legacy overrides to the intermediate kernel config, as string
  extraConfig ? ""

, # kernel intermediate config overrides, as a set
 structuredExtraConfig ? {}

, # The version number used for the module directory
  modDirVersion ? version

, # An attribute set whose attributes express the availability of
  # certain features in this kernel.  E.g. `{iwlwifi = true;}'
  # indicates a kernel that provides Intel wireless support.  Used in
  # NixOS to implement kernel-specific behaviour.
  features ? {}

, # Custom seed used for CONFIG_GCC_PLUGIN_RANDSTRUCT if enabled. This is
  # automatically extended with extra per-version and per-config values.
  randstructSeed ? ""

, # A list of patches to apply to the kernel.  Each element of this list
  # should be an attribute set {name, patch} where `name' is a
  # symbolic name and `patch' is the actual patch.  The patch may
  # optionally be compressed with gzip or bzip2.
  kernelPatches ? []
, ignoreConfigErrors ? stdenv.hostPlatform.platform.name != "pc" ||
                       stdenv.hostPlatform != stdenv.buildPlatform
, extraMeta ? {}

# easy overrides to stdenv.hostPlatform.platform members
, autoModules ? stdenv.hostPlatform.platform.kernelAutoModules
, preferBuiltin ? stdenv.hostPlatform.platform.kernelPreferBuiltin or false
, kernelArch ? stdenv.hostPlatform.platform.kernelArch

, ...
}:

assert stdenv.isLinux;

let

  lib = stdenv.lib;

  # Combine the `features' attribute sets of all the kernel patches.
  kernelFeatures = lib.fold (x: y: (x.features or {}) // y) ({
    iwlwifi = true;
    efiBootStub = true;
    needsCifsUtils = true;
    netfilterRPFilter = true;
    grsecurity = false;
    xen_dom0 = false;
    ia32Emulation = true;
  } // features) kernelPatches;

  commonStructuredConfig = import ./common-config.nix {
    inherit stdenv version ;

    features = kernelFeatures; # Ensure we know of all extra patches, etc.
  };

  intermediateNixConfig = configfile.moduleStructuredConfig.intermediateNixConfig
    # extra config in legacy string format
    + extraConfig
    + lib.optionalString (stdenv.hostPlatform.platform ? kernelExtraConfig) stdenv.hostPlatform.platform.kernelExtraConfig;

  structuredConfigFromPatches =
        map ({extraStructuredConfig ? {}, ...}: {settings=extraStructuredConfig;}) kernelPatches;

  # appends kernel patches extraConfig
  kernelConfigFun = baseConfigStr:
    let
      configFromPatches =
        map ({extraConfig ? "", ...}: extraConfig) kernelPatches;
    in lib.concatStringsSep "\n" ([baseConfigStr] ++ configFromPatches);

  configfile = stdenv.mkDerivation {
    inherit ignoreConfigErrors autoModules preferBuiltin kernelArch;
    pname = "linux-config";
    inherit version;

    generateConfig = ./generate-config.pl;

    kernelConfig = kernelConfigFun intermediateNixConfig;
    passAsFile = [ "kernelConfig" ];

    depsBuildBuild = [ buildPackages.stdenv.cc ];
    nativeBuildInputs = [ perl gmp libmpc mpfr ]
      ++ lib.optionals (stdenv.lib.versionAtLeast version "4.16") [ bison flex ];

    platformName = stdenv.hostPlatform.platform.name;
    # e.g. "defconfig"
    kernelBaseConfig = if defconfig != null then defconfig else stdenv.hostPlatform.platform.kernelBaseConfig;
    # e.g. "bzImage"
    kernelTarget = stdenv.hostPlatform.platform.kernelTarget;

    prePatch = kernel.prePatch + ''
      # Patch kconfig to print "###" after every question so that
      # generate-config.pl from the generic builder can answer them.
      sed -e '/fflush(stdout);/i\printf("###");' -i scripts/kconfig/conf.c
    '';

    preUnpack = kernel.preUnpack or "";

    inherit (kernel) src patches;

    buildPhase = ''
      export buildRoot="''${buildRoot:-build}"

      # Get a basic config file for later refinement with $generateConfig.
      make -C .  O="$buildRoot" $kernelBaseConfig \
          ARCH=$kernelArch \
          HOSTCC=${buildPackages.stdenv.cc.targetPrefix}gcc \
          HOSTCXX=${buildPackages.stdenv.cc.targetPrefix}g++

      # Create the config file.
      echo "generating kernel configuration..."
      ln -s "$kernelConfigPath" "$buildRoot/kernel-config"
      DEBUG=1 ARCH=$kernelArch KERNEL_CONFIG="$buildRoot/kernel-config" AUTO_MODULES=$autoModules \
           PREFER_BUILTIN=$preferBuiltin BUILD_ROOT="$buildRoot" SRC=. perl -w $generateConfig
    '';

    installPhase = "mv $buildRoot/.config $out";

    enableParallelBuilding = true;

    passthru = rec {

      module = import ../../../../nixos/modules/system/boot/kernel_config.nix;
      # used also in apache
      # { modules = [ { options = res.options; config = svc.config or svc; } ];
      #   check = false;
      # The result is a set of two attributes
      moduleStructuredConfig = (lib.evalModules {
        modules = [
          module
          { settings = commonStructuredConfig; _file = "pkgs/os-specific/linux/kernel/common-config.nix"; }
          { settings = structuredExtraConfig; _file = "structuredExtraConfig"; }
        ]
        ++  structuredConfigFromPatches
        ;
      }).config;

      #
      structuredConfig = moduleStructuredConfig.settings;
    };


  }; # end of configfile derivation

  kernel = (callPackage ./manual-config.nix {}) {
    inherit version modDirVersion src kernelPatches randstructSeed stdenv extraMeta configfile;

    config = { CONFIG_MODULES = "y"; CONFIG_FW_LOADER = "m"; };
  };

  passthru = {
    features = kernelFeatures;
    inherit commonStructuredConfig;
    passthru = kernel.passthru // (removeAttrs passthru [ "passthru" ]);
  };

in lib.extendDerivation true passthru kernel