AndroidKernel.mk

   1 #Android makefile to build kernel as a part of Android Build
   2
   3 ifeq ($(KERNEL_DEFCONFIG),)
   4 $(error KERNEL_DEFCONFIG must be set as environment variable)
   5 endif
   6
   7 ifeq ($(INSTALLED_KERNEL_TARGET),)
   8 KERNEL_OBJECTS := $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ
   9 INSTALLED_KERNEL_TARGET := $(PRODUCT_OUT)/kernel
  10 INSTALLED_DTBOIMAGE_TARGET := $(PRODUCT_OUT)/dtbo.img
  11 BOARD_PREBUILT_DTBOIMAGE := $(PRODUCT_OUT)/prebuilt_dtbo.img
  12 INSTALLED_DTB_TARGET := $(PRODUCT_OUT)/dtb.img
  13 BOARD_MKBOOTIMG_ARGS += \
  14         --second $(INSTALLED_DTB_TARGET) \
  15         --second_offset 0
  16 endif
  17
  18 TARGET_KERNEL_ARCH := $(strip $(TARGET_KERNEL_ARCH))
  19 ifeq ($(TARGET_KERNEL_ARCH),)
  20 KERNEL_ARCH := arm64
  21 else
  22 KERNEL_ARCH := $(TARGET_KERNEL_ARCH)
  23 endif
  24
  25 TARGET_KERNEL_MAKE_ENV := $(strip $(TARGET_KERNEL_MAKE_ENV))
  26 ifeq ($(TARGET_KERNEL_MAKE_ENV),)
  27 KERNEL_MAKE_ENV :=
  28 else
  29 KERNEL_MAKE_ENV := $(TARGET_KERNEL_MAKE_ENV)
  30 endif
  31
  32 ifeq ($(CROSS_COMPILE),)
  33 KERNEL_CROSS_COMPILE := aarch64-linux-android-
  34 else
  35 KERNEL_CROSS_COMPILE := $(CROSS_COMPILE)
  36 endif
  37
  38 SOONG_GLOBAL_CONFIG := build/soong/cc/config/global.go
  39 CLANG_VERSION := clang-4691093
  40 CLANG_PATH := prebuilts/clang/host/linux-x86
  41 CC :=$(PWD)/$(CLANG_PATH)/$(CLANG_VERSION)/bin/clang
  42
  43 KERNEL_LTO_ON = True
  44 ifneq ($(KERNEL_LTO_ON),)
  45 LLVM_AR :=$(PWD)/$(CLANG_PATH)/$(CLANG_VERSION)/bin/llvm-ar
  46 LLVM_DIS :=$(PWD)/$(CLANG_PATH)/$(CLANG_VERSION)/bin/llvm-dis
  47 LTO_LLVM_LIB_BASE = $(PWD)/$(CLANG_PATH)/$(CLANG_VERSION)/lib64/
  48 LLVM_OPTIONS := LLVM_AR=$(LLVM_AR) LLVM_DIS=$(LLVM_DIS) LTO_LLVM_LIB_BASE=$(LTO_LLVM_LIB_BASE)
  49 else
  50 LLVM_OPTIONS :=
  51 endif
  52
  53 ifeq ($(CLANG_TRIPLE),)
  54 CLANG_TRIPLE := aarch64-linux-gnu-
  55 else
  56 CLANG_TRIPLE := $(CLANG_TRIPLE)
  57 endif
  58
  59 BUILD_ROOT_LOC := ../../
  60 KERNEL_OUT := $(TARGET_OUT_INTERMEDIATES)/kernel/$(TARGET_SOC)
  61 KERNEL_OUT := $(KERNEL_OBJECTS)
  62 ifeq ($(TARGET_PREBUILT_KERNEL),)
  63
  64 KERNEL_CONFIG := $(KERNEL_OBJECTS)/.config
  65 KERNEL_BOOT := $(KERNEL_OBJECTS)/arch/$(KERNEL_ARCH)/boot
  66 KERNEL_BIN := $(KERNEL_BOOT)/Image
  67 KERNEL_DTB_DIR := $(KERNEL_BOOT)/dts/exynos
  68 KERNEL_DTB := $(KERNEL_DTB_DIR)/exynos9610.dtb
  69 MKDTIMG := $(HOST_OUT_EXECUTABLES)/mkdtimg
  70
  71 TARGET_KERNEL_SOURCE := kernel/$(TARGET_SOC)
  72 KERNEL_DTB_SOURCE_DIR := $(TARGET_KERNEL_SOURCE)/arch/$(KERNEL_ARCH)/boot/dts/exynos
  73 KERNEL_DTBO_CFG := $(KERNEL_DTB_SOURCE_DIR)/exynos9610_dtboimg.cfg
  74 KERNEL_MERGE_CONFIG := $(TARGET_KERNEL_SOURCE)/scripts/kconfig/merge_config.sh
  75 KERNEL_CONFIG_BASE := $(TARGET_KERNEL_SOURCE)/arch/$(KERNEL_ARCH)/configs
  76 KERNEL_DEFCONFIG_PATH := $(KERNEL_CONFIG_BASE)/$(KERNEL_DEFCONFIG)
  77
  78 ifeq ($(TARGET_PRODUCT),kane_factory)
  79 ERD9609_DEFCONFIG := erd9610_defconfig
  80 ERD9609_DEFCONFIG_PATH := $(KERNEL_CONFIG_BASE)/$(ERD9609_DEFCONFIG)
  81 ROBUSTA2_FACTORY_DEFCONFIG := robusta2_factory_defconfig
  82 ROBUSTA2_FACTORY_DEFCONFIG_PATH := $(KERNEL_CONFIG_BASE)/$(ROBUSTA2_FACTORY_DEFCONFIG)
  83 ERD9609_ROBUSTA2_FACTORY_DEFCONFIG := erd9610_robusta2_factory_defconfig
  84 ERD9609_ROBUSTA2_FACTORY_DEFCONFIG_PATH := $(KERNEL_CONFIG_BASE)/$(ERD9609_ROBUSTA2_FACTORY_DEFCONFIG)
  85 endif
  86
  87 ifeq ($(KERNEL_DEFCONFIG),)
  88 $(error Kernel configuration not defined, cannot build kernel)
  89 else
  90
  91 ifeq ($(TARGET_BUILD_VARIANT),eng)
  92 MAKE_CONFIG_CMD := $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(PWD)/$(KERNEL_OBJECTS) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(KERNEL_DEFCONFIG)
  93 else
  94 ifeq ($(TARGET_BUILD_VARIANT),userdebug)
  95 KERNEL_USER_CFG := $(KERNEL_CONFIG_BASE)/$(TARGET_SOC)_userdebug.cfg
  96 else
  97 KERNEL_USER_CFG := $(KERNEL_CONFIG_BASE)/$(TARGET_SOC)_user.cfg
  98 endif
  99 MAKE_CONFIG_CMD := ARCH=$(KERNEL_ARCH) $(KERNEL_MERGE_CONFIG) -m -O $(TARGET_KERNEL_SOURCE) $(KERNEL_DEFCONFIG_PATH) $(KERNEL_USER_CFG);
 100 MAKE_CONFIG_CMD += $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(PWD)/$(KERNEL_OBJECTS) ARCH=$(KERNEL_ARCH) KCONFIG_ALLCONFIG=.config alldefconfig;
 101 MAKE_CONFIG_CMD += $(MAKE) -C $(TARGET_KERNEL_SOURCE) distclean
 102 endif
 103
 104 ifeq ($(N_KERNEL_BUILD_THREAD),)
 105 N_KERNEL_BUILD_THREAD := 8
 106 endif
 107
 108 include $(TARGET_KERNEL_SOURCE)/defconfig.mk
 109
 110
 111 TARGET_PREBUILT_KERNEL := $(KERNEL_BIN)
 112
 113 # Make the kernel config
 114 #   $1 output dir
 115 #   $2 kernel config filepath
 116 #   $3 defconfig
 117 #   $4 kernel source
 118 #   $5 kernel make env
 119 #   $6 kernel architecture
 120 #   $7 cross compile sub-command
 121 #   $8 make command
 122 define do-kernel-config
 123     ( cp $(3) $(2) && $(8) -C $(4) O=$(1) $(5) ARCH=$(6) CROSS_COMPILE=$(7) defoldconfig ) || ( rm -f $(2) && false )
 124 endef
 125
 126
 127 $(KERNEL_OUT):
 128         mkdir -p $(KERNEL_OUT)
 129
 130 .PHONY: kernel
 131 kernel: $(KERNEL_BIN)
 132
 133 .PHONY: kernel-distclean
 134 kernel-distclean:
 135         $(MAKE) -C $(TARGET_KERNEL_SOURCE) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) distclean
 136
 137 $(KERNEL_CONFIG): $(TARGET_DEFCONFIG)
 138         $(hide) echo "make $(KERNEL_CONFIG)"
 139         $(call do-kernel-config,$(BUILD_ROOT_LOC)$(KERNEL_OUT),$@,$(TARGET_DEFCONFIG),$(TARGET_KERNEL_SOURCE),$(KERNEL_MAKE_ENV),$(KERNEL_ARCH),$(KERNEL_CROSS_COMPILE),$(MAKE))
 140
 141 $(KERNEL_BIN): $(KERNEL_OUT) $(KERNEL_CONFIG)
 142         $(hide) echo "Building kernel..."
 143         $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(PWD)/$(KERNEL_OBJECTS) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) CLANG_TRIPLE=$(CLANG_TRIPLE) CC=$(CC) $(LLVM_OPTIONS) -j$(N_KERNEL_BUILD_THREAD)
 144
 145 $(INSTALLED_KERNEL_TARGET): $(INSTALLED_DTBOIMAGE_TARGET)
 146         cp $(KERNEL_BIN) $(INSTALLED_KERNEL_TARGET)
 147         cp $(KERNEL_DTB) $(INSTALLED_DTB_TARGET)
 148
 149 $(BOARD_PREBUILT_DTBOIMAGE): $(MKDTIMG) $(KERNEL_DTBO_CFG) $(KERNEL_BIN)
 150         $(hide) echo "Building DTBOIMAGE..."
 151         $(MKDTIMG) cfg_create $@ $(KERNEL_DTBO_CFG) -d $(KERNEL_OBJECTS)
 152
 153 endif #TARGET_PREBUILT_KERNEL
 154 endif #KERNEL_DEFCONFIG