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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_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
#
# NEED_KERNEL_MODULE_ROOT = Optional, if true, install kernel
# modules in root instead of vendor
# NEED_KERNEL_MODULE_SYSTEM = Optional, if true, install kernel
# modules in system instead of vendor
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
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_SRC := $(KERNEL_SRC)/arch/$(KERNEL_DEFCONFIG_ARCH)/configs/$(KERNEL_DEFCONFIG)
ifeq ($(BOARD_KERNEL_IMAGE_NAME),)
$(error BOARD_KERNEL_IMAGE_NAME not defined.)
endif
TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/$(BOARD_KERNEL_IMAGE_NAME)
ifneq ($(TARGET_KERNEL_ADDITIONAL_CONFIG),)
KERNEL_ADDITIONAL_CONFIG := $(TARGET_KERNEL_ADDITIONAL_CONFIG)
KERNEL_ADDITIONAL_CONFIG_SRC := $(KERNEL_SRC)/arch/$(KERNEL_ARCH)/configs/$(KERNEL_ADDITIONAL_CONFIG)
ifeq ("$(wildcard $(KERNEL_ADDITIONAL_CONFIG_SRC))","")
$(warning TARGET_KERNEL_ADDITIONAL_CONFIG '$(TARGET_KERNEL_ADDITIONAL_CONFIG)' doesn't exist)
KERNEL_ADDITIONAL_CONFIG_SRC := /dev/null
endif
else
KERNEL_ADDITIONAL_CONFIG_SRC := /dev/null
endif
ifeq "$(wildcard $(KERNEL_SRC) )" ""
ifneq ($(TARGET_PREBUILT_KERNEL),)
HAS_PREBUILT_KERNEL := true
NEEDS_KERNEL_COPY := true
else
$(foreach cf,$(PRODUCT_COPY_FILES), \
$(eval _src := $(call word-colon,1,$(cf))) \
$(eval _dest := $(call word-colon,2,$(cf))) \
$(ifeq kernel,$(_dest), \
$(eval HAS_PREBUILT_KERNEL := true)))
endif
ifneq ($(HAS_PREBUILT_KERNEL),)
$(warning ***************************************************************)
$(warning * Using prebuilt kernel binary instead of source *)
$(warning * THIS IS DEPRECATED, AND WILL BE DISCONTINUED *)
$(warning * Please configure your device to download the kernel *)
$(warning * source repository to $(KERNEL_SRC))
$(warning * for more information *)
$(warning ***************************************************************)
FULL_KERNEL_BUILD := false
KERNEL_BIN := $(TARGET_PREBUILT_KERNEL)
else
$(warning ***************************************************************)
$(warning * *)
$(warning * No kernel source found, and no fallback prebuilt defined. *)
$(warning * Please make sure your device is properly configured to *)
$(warning * download the kernel repository to $(KERNEL_SRC))
$(warning * and add the TARGET_KERNEL_CONFIG variable to BoardConfig.mk *)
$(warning * *)
$(warning * As an alternative, define the TARGET_PREBUILT_KERNEL *)
$(warning * variable with the path to the prebuilt binary kernel image *)
$(warning * in your BoardConfig.mk file *)
$(warning * *)
$(warning ***************************************************************)
$(error "NO KERNEL")
endif
else
NEEDS_KERNEL_COPY := true
ifeq ($(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 := $(TARGET_PREBUILT_INT_KERNEL)
endif
endif
ifeq ($(FULL_KERNEL_BUILD),true)
ifeq ($(NEED_KERNEL_MODULE_ROOT),true)
KERNEL_MODULES_OUT := $(TARGET_ROOT_OUT)
KERNEL_DEPMOD_STAGING_DIR := $(call intermediates-dir-for,PACKAGING,depmod_recovery)
KERNEL_MODULE_MOUNTPOINT :=
else ifeq ($(NEED_KERNEL_MODULE_SYSTEM),true)
KERNEL_MODULES_OUT := $(TARGET_OUT)
KERNEL_DEPMOD_STAGING_DIR := $(call intermediates-dir-for,PACKAGING,depmod_system)
KERNEL_MODULE_MOUNTPOINT := system
else
KERNEL_MODULES_OUT := $(TARGET_OUT_VENDOR)
KERNEL_DEPMOD_STAGING_DIR := $(call intermediates-dir-for,PACKAGING,depmod_vendor)
KERNEL_MODULE_MOUNTPOINT := vendor
endif
MODULES_INTERMEDIATES := $(call intermediates-dir-for,PACKAGING,kernel_modules)
ifeq ($(TARGET_KERNEL_CLANG_COMPILE),true)
ifneq ($(TARGET_KERNEL_CLANG_VERSION),)
# Find the clang-* directory containing the specified version
KERNEL_CLANG_VERSION := $(shell find $(BUILD_TOP)/prebuilts/clang/host/$(HOST_OS)-x86/ -name AndroidVersion.txt -exec grep -l $(TARGET_KERNEL_CLANG_VERSION) "{}" \; | sed -e 's|/AndroidVersion.txt$$||g;s|^.*/||g')
else
# Use the default version of clang if TARGET_KERNEL_CLANG_VERSION hasn't been set by the device config
KERNEL_CLANG_VERSION := $(LLVM_PREBUILTS_VERSION)
endif
TARGET_KERNEL_CLANG_PATH ?= $(BUILD_TOP)/prebuilts/clang/host/$(HOST_OS)-x86/$(KERNEL_CLANG_VERSION)/bin
ifeq ($(KERNEL_ARCH),arm64)
KERNEL_CLANG_TRIPLE ?= CLANG_TRIPLE=aarch64-linux-gnu-
else ifeq ($(KERNEL_ARCH),arm)
KERNEL_CLANG_TRIPLE ?= CLANG_TRIPLE=arm-linux-gnu-
else ifeq ($(KERNEL_ARCH),x86)
KERNEL_CLANG_TRIPLE ?= CLANG_TRIPLE=x86_64-linux-gnu-
endif
PATH_OVERRIDE := PATH=$(TARGET_KERNEL_CLANG_PATH):$$PATH LD_LIBRARY_PATH=$(BUILD_TOP)/prebuilts/clang/host/$(HOST_OS)-x86/$(KERNEL_CLANG_VERSION)/lib64:$$LD_LIBRARY_PATH
ifeq ($(KERNEL_CC),)
KERNEL_CC := CC="$(CCACHE_BIN) clang"
endif
endif
ifeq ($(TARGET_KERNEL_MODULES),)
TARGET_KERNEL_MODULES := INSTALLED_KERNEL_MODULES
endif
KERNEL_ADDITIONAL_CONFIG_OUT := $(KERNEL_OUT)/.additional_config
# 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) $(MAKE) -C $(KERNEL_SRC) O=$(1) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) $(KERNEL_CLANG_TRIPLE) $(KERNEL_CC) $(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
.PHONY: force_additional_config
$(KERNEL_ADDITIONAL_CONFIG_OUT): force_additional_config
$(hide) cmp -s $(KERNEL_ADDITIONAL_CONFIG_SRC) $@ || cp $(KERNEL_ADDITIONAL_CONFIG_SRC) $@;
$(KERNEL_CONFIG): $(KERNEL_DEFCONFIG_SRC) $(KERNEL_ADDITIONAL_CONFIG_OUT)
@echo "Building Kernel Config"
$(hide) mkdir -p $(KERNEL_OUT)
$(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)
$(hide) if [ ! -z "$(KERNEL_ADDITIONAL_CONFIG)" ]; then \
echo "Using additional config '$(KERNEL_ADDITIONAL_CONFIG)'"; \
$(KERNEL_SRC)/scripts/kconfig/merge_config.sh -m -O $(KERNEL_OUT) $(KERNEL_OUT)/.config $(KERNEL_SRC)/arch/$(KERNEL_ARCH)/configs/$(KERNEL_ADDITIONAL_CONFIG); \
$(call make-kernel-target,KCONFIG_ALLCONFIG=$(KERNEL_OUT)/.config alldefconfig); \
fi
# TODO
# For now this creates some issue because of ifneq ($(BOARD_KERNEL_IMAGE_NAME),zImage-dtb)
# ifneq ($(BOARD_DTB_IMAGE_NAME),)
# ifneq ($(BOARD_KERNEL_IMAGE_NAME),zImage-dtb)
# $(warning **********************************************************)
# $(warning * DTB image found, but ${BOARD_KERNEL_IMAGE_NAME} is not *)
# $(warning * supported with BOARD_DTB_IMAGE_NAME. Please use *)
# $(warning * TARGET_KERNEL_CONFIG="zImage-dtb" instead in your your *)
# $(warning * BoardConfig.mk file *)
# $(warning **********************************************************)
# $(error "WRONG BOARD_KERNEL_IMAGE_NAME")
# endif
# endif
.PHONY: TARGET_KERNEL_BINARIES
TARGET_KERNEL_BINARIES: $(KERNEL_CONFIG)
@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); \
fi
.PHONY: INSTALLED_KERNEL_MODULES
INSTALLED_KERNEL_MODULES: depmod-host
$(hide) if grep -q '=m' $(KERNEL_CONFIG); then \
echo "Installing Kernel Modules"; \
$(call make-kernel-target,INSTALL_MOD_PATH=$(MODULES_INTERMEDIATES) modules_install); \
kernel_release=$$(cat $(KERNEL_RELEASE)) \
modules=$$(find $(MODULES_INTERMEDIATES)/lib/modules/$$kernel_release -type f -name '*.ko'); \
for f in $$modules; do \
$(KERNEL_TOOLCHAIN_PATH)strip --strip-unneeded $$f; \
done; \
($(call build-image-kernel-modules,$$modules,$(KERNEL_MODULES_OUT),$(KERNEL_MODULE_MOUNTPOINT)/,$(KERNEL_DEPMOD_STAGING_DIR))); \
fi
$(TARGET_KERNEL_MODULES): TARGET_KERNEL_BINARIES
$(TARGET_PREBUILT_INT_KERNEL): $(TARGET_KERNEL_MODULES)
.PHONY: kerneltags
kerneltags: $(KERNEL_CONFIG)
$(hide) mkdir -p $(KERNEL_OUT)
$(call make-kernel-target,tags)
.PHONY: kernelsavedefconfig alldefconfig
kernelsavedefconfig:
$(hide) mkdir -p $(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:
$(hide) mkdir -p $(KERNEL_OUT)
env KCONFIG_NOTIMESTAMP=true \
$(call make-kernel-target,alldefconfig)
ifeq ($(TARGET_NEEDS_DTBOIMAGE),true)
BOARD_PREBUILT_DTBOIMAGE = $(PRODUCT_OUT)/dtbo/arch/$(KERNEL_ARCH)/boot/dtbo.img
$(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)
endif # TARGET_NO_KERNEL
|
