build/tasks/kernel.mk

   1 #
   2 # Copyright (C) 2014-2019 The Android-x86 Open Source Project
   3 #
   4 # Licensed under the Apache License, Version 2.0 (the "License");
   5 # you may not use this file except in compliance with the License.
   6 # You may obtain a copy of the License at
   7 #
   8 #      http://www.apache.org/licenses/LICENSE-2.0
   9 #
  10
  11 ifneq ($(TARGET_NO_KERNEL),true)
  12 ifeq ($(TARGET_PREBUILT_KERNEL),)
  13
  14 KERNEL_DIR ?= kernel
  15
  16 ifneq ($(filter x86%,$(TARGET_ARCH)),)
  17 TARGET_KERNEL_ARCH ?= $(TARGET_ARCH)
  18 KERNEL_TARGET := bzImage
  19 TARGET_KERNEL_CONFIG ?= android-$(TARGET_KERNEL_ARCH)_defconfig
  20 KERNEL_CONFIG_DIR := arch/x86/configs
  21 endif
  22 ifeq ($(TARGET_ARCH),arm)
  23 KERNEL_TARGET := zImage
  24 TARGET_KERNEL_CONFIG ?= goldfish_defconfig
  25 KERNEL_CONFIG_DIR := arch/arm/configs
  26 endif
  27
  28 KERNEL_CLANG_CLAGS := HOSTCC=$(abspath $(LLVM_PREBUILTS_PATH)/clang)
  29 ifeq ($(BUILD_KERNEL_WITH_CLANG),true)
  30 CROSS_COMPILE := x86_64-linux-androidkernel-
  31 KERNEL_CLANG_CLAGS += CC=$(abspath $(LLVM_PREBUILTS_PATH)/clang) CLANG_TRIPLE=x86_64-linux-gnu-
  32 else
  33 ifeq ($(TARGET_KERNEL_ARCH),x86_64)
  34 ifeq ($(HOST_OS),darwin)
  35 CROSS_COMPILE ?= $(abspath prebuilts/gcc/darwin-x86/host/i686-apple-darwin-4.2.1/bin)/i686-apple-darwin11-
  36 else
  37 CROSS_COMPILE ?= $(abspath prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.6/bin)/x86_64-linux-
  38 endif
  39 else
  40 CROSS_COMPILE ?= $(abspath $(TARGET_TOOLS_PREFIX))
  41 endif
  42 endif
  43
  44 KBUILD_OUTPUT := $(TARGET_OUT_INTERMEDIATES)/kernel
  45 ifeq ($(HOST_OS),darwin)
  46 KBUILD_JOBS := $(shell /usr/sbin/sysctl -n hw.ncpu)
  47 else
  48 KBUILD_JOBS := $(shell echo $$((1-(`cat /sys/devices/system/cpu/present`))))
  49 endif
  50
  51 mk_kernel := + $(hide) prebuilts/build-tools/$(HOST_PREBUILT_TAG)/bin/make -j$(KBUILD_JOBS) -l$$(($(KBUILD_JOBS)+2)) \
  52         -C $(KERNEL_DIR) O=$(abspath $(KBUILD_OUTPUT)) ARCH=$(TARGET_ARCH) CROSS_COMPILE="$(abspath $(CC_WRAPPER)) $(CROSS_COMPILE)" $(if $(SHOW_COMMANDS),V=1) \
  53         YACC=$(abspath $(BISON)) LEX=$(abspath $(LEX)) \
  54         $(KERNEL_CLANG_CLAGS)
  55
  56 KERNEL_CONFIG_FILE := $(if $(wildcard $(TARGET_KERNEL_CONFIG)),$(TARGET_KERNEL_CONFIG),$(KERNEL_DIR)/$(KERNEL_CONFIG_DIR)/$(TARGET_KERNEL_CONFIG))
  57
  58 MOD_ENABLED := $(shell grep ^CONFIG_MODULES=y $(KERNEL_CONFIG_FILE))
  59 FIRMWARE_ENABLED := $(shell grep ^CONFIG_FIRMWARE_IN_KERNEL=y $(KERNEL_CONFIG_FILE))
  60
  61 # I understand Android build system discourage to use submake,
  62 # but I don't want to write a complex Android.mk to build kernel.
  63 # This is the simplest way I can think.
  64 KERNEL_DOTCONFIG_FILE := $(KBUILD_OUTPUT)/.config
  65 ifneq ($(filter 0,$(shell grep -s ^$(if $(filter x86,$(TARGET_KERNEL_ARCH)),\#.)CONFIG_64BIT $(KERNEL_DOTCONFIG_FILE) | wc -l)),)
  66 KERNEL_ARCH_CHANGED := $(KERNEL_DOTCONFIG_FILE)-
  67 $(KERNEL_ARCH_CHANGED):
  68                 @touch $@
  69 endif
  70 $(KERNEL_DOTCONFIG_FILE): $(KERNEL_CONFIG_FILE) $(wildcard $(TARGET_KERNEL_DIFFCONFIG)) $(KERNEL_ARCH_CHANGED)
  71         $(hide) mkdir -p $(@D) && cat $(wildcard $^) > $@
  72         $(hide) ln -sf ../../../../../../prebuilts $(@D)
  73         $(hide) rm -f $(KERNEL_ARCH_CHANGED)
  74
  75 BUILT_KERNEL_TARGET := $(KBUILD_OUTPUT)/arch/$(TARGET_ARCH)/boot/$(KERNEL_TARGET)
  76 $(BUILT_KERNEL_TARGET): $(KERNEL_DOTCONFIG_FILE)
  77         # A dirty hack to use ar & ld
  78         $(hide) mkdir -p $(OUT_DIR)/.path; ln -sf ../../$(LLVM_PREBUILTS_PATH)/llvm-ar $(OUT_DIR)/.path/ar; ln -sf ../../$(LLVM_PREBUILTS_PATH)/ld.lld $(OUT_DIR)/.path/ld
  79 ifeq ($(BUILD_KERNEL_WITH_CLANG),true)
  80         $(hide) cd $(OUT_DIR)/.path; ln -sf ../../$(dir $(TARGET_TOOLS_PREFIX))x86_64-linux-androidkernel-* .; ln -sf x86_64-linux-androidkernel-as x86_64-linux-gnu-as
  81 endif
  82         $(mk_kernel) olddefconfig
  83         $(mk_kernel) $(KERNEL_TARGET) $(if $(MOD_ENABLED),modules)
  84         $(if $(FIRMWARE_ENABLED),$(mk_kernel) INSTALL_MOD_PATH=$(abspath $(TARGET_OUT)) firmware_install)
  85
  86 ifneq ($(MOD_ENABLED),)
  87 KERNEL_MODULES_DEP := $(firstword $(wildcard $(TARGET_OUT)/lib/modules/*/modules.dep))
  88 KERNEL_MODULES_DEP := $(if $(KERNEL_MODULES_DEP),$(KERNEL_MODULES_DEP),$(TARGET_OUT)/lib/modules)
  89
  90 ALL_EXTRA_MODULES := $(patsubst %,$(TARGET_OUT_INTERMEDIATES)/kmodule/%,$(TARGET_EXTRA_KERNEL_MODULES))
  91 $(ALL_EXTRA_MODULES): $(TARGET_OUT_INTERMEDIATES)/kmodule/%: $(BUILT_KERNEL_TARGET) | $(ACP)
  92         @echo Building additional kernel module $*
  93         $(hide) mkdir -p $(@D) && $(ACP) -fr $(EXTRA_KERNEL_MODULE_PATH_$*) $(@D)
  94         $(mk_kernel) M=$(abspath $@) modules || ( rm -rf $@ && exit 1 )
  95
  96 $(KERNEL_MODULES_DEP): $(BUILT_KERNEL_TARGET) $(ALL_EXTRA_MODULES)
  97         $(hide) rm -rf $(TARGET_OUT)/lib/modules
  98         $(mk_kernel) INSTALL_MOD_PATH=$(abspath $(TARGET_OUT)) modules_install
  99         + $(hide) for kmod in $(TARGET_EXTRA_KERNEL_MODULES) ; do \
 100                 echo Installing additional kernel module $${kmod} ; \
 101                 $(subst +,,$(subst $(hide),,$(mk_kernel))) INSTALL_MOD_PATH=$(abspath $(TARGET_OUT)) M=$(abspath $(TARGET_OUT_INTERMEDIATES))/kmodule/$${kmod} modules_install ; \
 102         done
 103         $(hide) rm -f $(TARGET_OUT)/lib/modules/*/{build,source}
 104 endif
 105
 106 $(BUILT_SYSTEMIMAGE): $(KERNEL_MODULES_DEP)
 107
 108 installclean: FILES += $(KBUILD_OUTPUT) $(INSTALLED_KERNEL_TARGET)
 109
 110 TARGET_PREBUILT_KERNEL := $(BUILT_KERNEL_TARGET)
 111
 112 .PHONY: kernel
 113 kernel: $(INSTALLED_KERNEL_TARGET) $(KERNEL_MODULES_DEP)
 114
 115 endif # TARGET_PREBUILT_KERNEL
 116
 117 ifndef LINEAGE_BUILD
 118 $(INSTALLED_KERNEL_TARGET): $(TARGET_PREBUILT_KERNEL) | $(ACP)
 119         $(copy-file-to-new-target)
 120 ifdef TARGET_PREBUILT_MODULES
 121         mkdir -p $(TARGET_OUT)/lib
 122         $(hide) cp -r $(TARGET_PREBUILT_MODULES) $(TARGET_OUT)/lib
 123 endif
 124 endif # LINEAGE_BUILD
 125 endif # KBUILD_OUTPUT