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# Copyright (C) 2012 The CyanogenMod Project
# (C) 2017 The LineageOS Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Android makefile to build kernel as a part of Android Build
#
# Configuration
# =============
#
# These config vars are usually set in BoardConfig.mk:
#
# TARGET_KERNEL_CONFIG = Kernel defconfig
# TARGET_KERNEL_VARIANT_CONFIG = Variant defconfig, optional
# TARGET_KERNEL_SELINUX_CONFIG = SELinux defconfig, optional
# TARGET_KERNEL_ADDITIONAL_CONFIG = Additional defconfig, optional
#
# TARGET_KERNEL_CLANG_COMPILE = Compile kernel with clang, defaults to false
#
# TARGET_KERNEL_CLANG_VERSION = Clang prebuilts version, optional, defaults to clang-stable
#
# TARGET_KERNEL_CLANG_PATH = Clang prebuilts path, optional
#
# BOARD_KERNEL_IMAGE_NAME = Built image name
# for ARM use: zImage
# for ARM64 use: Image.gz
# for uncompressed use: Image
# If using an appended DT, append '-dtb'
# to the end of the image name.
# For example, for ARM devices,
# use zImage-dtb instead of zImage.
#
# KERNEL_CC = The C Compiler used. This is automatically set based
# on whether the clang version is set, optional.
# KERNEL_LD = The Linker used. This is automatically set based
# on whether the clang/gcc version is set, optional.
#
# KERNEL_CLANG_TRIPLE = Target triple for clang (e.g. aarch64-linux-gnu-)
# defaults to arm-linux-gnu- for arm
# aarch64-linux-gnu- for arm64
# x86_64-linux-gnu- for x86
ifneq ($(TARGET_NO_KERNEL),true)
## Externally influenced variables
KERNEL_SRC := $(TARGET_KERNEL_SOURCE)
# kernel configuration - mandatory
KERNEL_DEFCONFIG := $(TARGET_KERNEL_CONFIG)
VARIANT_DEFCONFIG := $(TARGET_KERNEL_VARIANT_CONFIG)
SELINUX_DEFCONFIG := $(TARGET_KERNEL_SELINUX_CONFIG)
## Internal variables
DTBS_OUT := $(PRODUCT_OUT)/dtbs
KERNEL_OUT := $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ
KERNEL_CONFIG := $(KERNEL_OUT)/.config
KERNEL_RELEASE := $(KERNEL_OUT)/include/config/kernel.release
ifeq ($(KERNEL_ARCH),x86_64)
KERNEL_DEFCONFIG_ARCH := x86
else
KERNEL_DEFCONFIG_ARCH := $(KERNEL_ARCH)
endif
KERNEL_DEFCONFIG_DIR := $(KERNEL_SRC)/arch/$(KERNEL_DEFCONFIG_ARCH)/configs
KERNEL_DEFCONFIG_SRC := $(KERNEL_DEFCONFIG_DIR)/$(KERNEL_DEFCONFIG)
ifeq ($(BOARD_KERNEL_IMAGE_NAME),)
$(error BOARD_KERNEL_IMAGE_NAME not defined.)
endif
TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/$(BOARD_KERNEL_IMAGE_NAME)
NEEDS_KERNEL_COPY := true
ifeq ($(TARGET_KERNEL_CONFIG),)
$(warning **********************************************************)
$(warning * Kernel source found, but no configuration was defined *)
$(warning * Please add the TARGET_KERNEL_CONFIG variable to your *)
$(warning * BoardConfig.mk file *)
$(warning **********************************************************)
# $(error "NO KERNEL CONFIG")
else
#$(info Kernel source found, building it)
FULL_KERNEL_BUILD := true
KERNEL_BIN := $(TARGET_PREBUILT_INT_KERNEL)
endif
ifeq ($(FULL_KERNEL_BUILD),true)
KERNEL_MODULES_OUT := $(TARGET_OUT_VENDOR)
KERNEL_DEPMOD_STAGING_DIR := $(KERNEL_BUILD_OUT_PREFIX)$(call intermediates-dir-for,PACKAGING,depmod_vendor)
KERNEL_MODULE_MOUNTPOINT := vendor
MODULES_INTERMEDIATES := $(KERNEL_BUILD_OUT_PREFIX)$(call intermediates-dir-for,PACKAGING,kernel_modules)
PATH_OVERRIDE :=
ifeq ($(TARGET_KERNEL_CLANG_COMPILE),true)
ifneq ($(TARGET_KERNEL_CLANG_VERSION),)
KERNEL_CLANG_VERSION := clang-$(TARGET_KERNEL_CLANG_VERSION)
else
# Use the default version of clang if TARGET_KERNEL_CLANG_VERSION hasn't been set by the device config
KERNEL_CLANG_VERSION := $(LLVM_PREBUILTS_VERSION)
endif
TARGET_KERNEL_CLANG_PATH ?= $(BUILD_TOP)/prebuilts/clang/host/$(HOST_OS)-x86/$(KERNEL_CLANG_VERSION)
ifeq ($(KERNEL_ARCH),arm64)
KERNEL_CLANG_TRIPLE ?= CLANG_TRIPLE=aarch64-linux-gnu-
else ifeq ($(KERNEL_ARCH),arm)
KERNEL_CLANG_TRIPLE ?= CLANG_TRIPLE=arm-linux-gnu-
else ifeq ($(KERNEL_ARCH),x86)
KERNEL_CLANG_TRIPLE ?= CLANG_TRIPLE=x86_64-linux-gnu-
endif
PATH_OVERRIDE += PATH=$(TARGET_KERNEL_CLANG_PATH)/bin:$$PATH LD_LIBRARY_PATH=$(TARGET_KERNEL_CLANG_PATH)/lib64:$$LD_LIBRARY_PATH
ifeq ($(KERNEL_CC),)
KERNEL_CC := CC="$(CCACHE_BIN) clang"
endif
ifeq ($(KERNEL_LD),)
KERNEL_LD :=
endif
endif
ifneq ($(TARGET_KERNEL_MODULES),)
$(error TARGET_KERNEL_MODULES is no longer supported!)
endif
PATH_OVERRIDE += PATH=$(KERNEL_TOOLCHAIN_PATH_gcc)/bin:$$PATH
# System tools are no longer allowed on 10+
PATH_OVERRIDE += $(TOOLS_PATH_OVERRIDE)
# Internal implementation of make-kernel-target
# $(1): output path (The value passed to O=)
# $(2): target to build (eg. defconfig, modules, dtbo.img)
define internal-make-kernel-target
$(PATH_OVERRIDE) $(KERNEL_MAKE_CMD) $(KERNEL_MAKE_FLAGS) -C $(KERNEL_SRC) O=$(KERNEL_BUILD_OUT_PREFIX)$(1) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) $(KERNEL_CLANG_TRIPLE) $(KERNEL_CC) $(KERNEL_LD) XZ=$(KERNEL_XZ) $(2)
endef
# Make a kernel target
# $(1): The kernel target to build (eg. defconfig, modules, modules_install)
define make-kernel-target
$(call internal-make-kernel-target,$(KERNEL_OUT),$(1))
endef
# Make a DTBO target
# $(1): The DTBO target to build (eg. dtbo.img, defconfig)
define make-dtbo-target
$(call internal-make-kernel-target,$(PRODUCT_OUT)/dtbo,$(1))
endef
# Make a DTB targets
# $(1): The DTB target to build (eg. dtbs, defconfig)
define make-dtb-target
$(call internal-make-kernel-target,$(DTBS_OUT),$(1))
endef
$(KERNEL_OUT):
mkdir -p $(KERNEL_OUT)
$(KERNEL_CONFIG): $(KERNEL_DEFCONFIG_SRC)
@echo "Building Kernel Config"
$(call make-kernel-target,VARIANT_DEFCONFIG=$(VARIANT_DEFCONFIG) SELINUX_DEFCONFIG=$(SELINUX_DEFCONFIG) $(KERNEL_DEFCONFIG))
$(hide) if [ ! -z "$(KERNEL_CONFIG_OVERRIDE)" ]; then \
echo "Overriding kernel config with '$(KERNEL_CONFIG_OVERRIDE)'"; \
echo $(KERNEL_CONFIG_OVERRIDE) >> $(KERNEL_OUT)/.config; \
$(call make-kernel-target,oldconfig); \
fi
# Create defconfig build artifact
$(call make-kernel-target,savedefconfig)
$(TARGET_PREBUILT_INT_KERNEL): $(KERNEL_CONFIG) $(DEPMOD)
@echo "Building Kernel"
ifneq ($(BOARD_DTB_IMAGE_NAME),)
$(call make-kernel-target,zImage)
$(call make-kernel-target,$(BOARD_DTB_IMAGE_NAME))
cat $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/zImage \
$(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/dts/$(BOARD_DTB_IMAGE_NAME) \
> $(KERNEL_BIN)
else
$(call make-kernel-target,$(BOARD_KERNEL_IMAGE_NAME))
$(hide) if grep -q '^CONFIG_OF=y' $(KERNEL_CONFIG); then \
echo "Building DTBs"; \
$(call make-kernel-target,dtbs); \
fi
endif
$(hide) if grep -q '=m' $(KERNEL_CONFIG); then \
echo "Building Kernel Modules"; \
$(call make-kernel-target,modules) || exit "$$?"; \
echo "Installing Kernel Modules"; \
$(call make-kernel-target,INSTALL_MOD_PATH=$(MODULES_INTERMEDIATES) INSTALL_MOD_STRIP=1 modules_install); \
kernel_release=$$(cat $(KERNEL_RELEASE)) \
modules=$$(find $(MODULES_INTERMEDIATES)/lib/modules/$$kernel_release -type f -name '*.ko'); \
($(call build-image-kernel-modules,$$modules,$(KERNEL_MODULES_OUT),$(KERNEL_MODULE_MOUNTPOINT)/,$(KERNEL_DEPMOD_STAGING_DIR))); \
fi
.PHONY: kerneltags
kerneltags: $(KERNEL_CONFIG)
$(call make-kernel-target,tags)
.PHONY: kernelsavedefconfig alldefconfig
kernelsavedefconfig: $(KERNEL_OUT)
$(call make-kernel-target,$(KERNEL_DEFCONFIG))
env KCONFIG_NOTIMESTAMP=true \
$(call make-kernel-target,savedefconfig)
cp $(KERNEL_OUT)/defconfig $(KERNEL_DEFCONFIG_SRC)
alldefconfig: $(KERNEL_OUT)
env KCONFIG_NOTIMESTAMP=true \
$(call make-kernel-target,alldefconfig)
ifeq ($(TARGET_NEEDS_DTBOIMAGE),true)
$(BOARD_PREBUILT_DTBOIMAGE):
echo -e ${CL_GRN}"Building DTBO.img"${CL_RST}
$(call make-dtbo-target,$(KERNEL_DEFCONFIG))
$(call make-dtbo-target,dtbo.img)
endif # TARGET_NEEDS_DTBOIMAGE
endif # FULL_KERNEL_BUILD
## Install it
ifeq ($(NEEDS_KERNEL_COPY),true)
file := $(INSTALLED_KERNEL_TARGET)
ALL_PREBUILT += $(file)
$(file) : $(KERNEL_BIN) | $(ACP)
$(transform-prebuilt-to-target)
ALL_PREBUILT += $(INSTALLED_KERNEL_TARGET)
endif
INSTALLED_DTBOIMAGE_TARGET := $(PRODUCT_OUT)/dtbo.img
ALL_PREBUILT += $(INSTALLED_DTBOIMAGE_TARGET)
.PHONY: kernel
kernel: $(INSTALLED_KERNEL_TARGET)
.PHONY: dtboimage
dtboimage: $(INSTALLED_DTBOIMAGE_TARGET)
ifeq ($(BOARD_INCLUDE_DTB_IN_BOOTIMG),true)
ifeq ($(BOARD_PREBUILT_DTBIMAGE_DIR),)
$(INSTALLED_DTBIMAGE_TARGET):
echo -e ${CL_GRN}"Building DTBs"${CL_RST}
$(call make-dtb-target,$(KERNEL_DEFCONFIG))
$(call make-dtb-target,dtbs)
cat $(shell find $(DTBS_OUT)/arch/$(KERNEL_ARCH)/boot/dts/** -type f -name "*.dtb" | sort) > $@
endif
.PHONY: dtbimage
dtbimage: $(INSTALLED_DTBIMAGE_TARGET)
endif # BOARD_INCLUDE_DTB_IN_BOOTIMG
endif # TARGET_NO_KERNEL
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