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AndroidKernel.mk
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AndroidKernel.mk
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#Android makefile to build kernel as a part of Android Build
PERL = perl
KERNEL_TARGET := $(strip $(INSTALLED_KERNEL_TARGET))
ifeq ($(KERNEL_TARGET),)
INSTALLED_KERNEL_TARGET := $(PRODUCT_OUT)/kernel
endif
TARGET_KERNEL_ARCH := $(strip $(TARGET_KERNEL_ARCH))
ifeq ($(TARGET_KERNEL_ARCH),)
KERNEL_ARCH := arm
else
KERNEL_ARCH := $(TARGET_KERNEL_ARCH)
endif
TARGET_KERNEL_HEADER_ARCH := $(strip $(TARGET_KERNEL_HEADER_ARCH))
ifeq ($(TARGET_KERNEL_HEADER_ARCH),)
KERNEL_HEADER_ARCH := $(KERNEL_ARCH)
else
$(warning Forcing kernel header generation only for '$(TARGET_KERNEL_HEADER_ARCH)')
KERNEL_HEADER_ARCH := $(TARGET_KERNEL_HEADER_ARCH)
endif
# Force 32-bit binder IPC for 64bit kernel with 32bit userspace
ifeq ($(KERNEL_ARCH),arm64)
ifeq ($(TARGET_ARCH),arm)
KERNEL_CONFIG_OVERRIDE := CONFIG_ANDROID_BINDER_IPC_32BIT=y
endif
endif
TARGET_KERNEL_CROSS_COMPILE_PREFIX := $(strip $(TARGET_KERNEL_CROSS_COMPILE_PREFIX))
ifeq ($(TARGET_KERNEL_CROSS_COMPILE_PREFIX),)
KERNEL_CROSS_COMPILE := arm-eabi-
else
KERNEL_CROSS_COMPILE := $(TARGET_KERNEL_CROSS_COMPILE_PREFIX)
endif
ifeq ($(TARGET_PREBUILT_KERNEL),)
KERNEL_GCC_NOANDROID_CHK := $(shell (echo "int main() {return 0;}" | $(KERNEL_CROSS_COMPILE)gcc -E -mno-android - > /dev/null 2>&1 ; echo $$?))
ifeq ($(strip $(KERNEL_GCC_NOANDROID_CHK)),0)
KERNEL_CFLAGS := KCFLAGS=-mno-android
endif
KERNEL_OUT := $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ
KERNEL_CONFIG := $(KERNEL_OUT)/.config
ifeq ($(KERNEL_DEFCONFIG)$(wildcard $(KERNEL_CONFIG)),)
$(error Kernel configuration not defined, cannot build kernel)
else
ifeq ($(TARGET_USES_UNCOMPRESSED_KERNEL),true)
$(info Using uncompressed kernel)
TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/Image
else
ifeq ($(KERNEL_ARCH),arm64)
TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/Image.gz
else
TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/zImage
endif
endif
ifeq ($(TARGET_KERNEL_APPEND_DTB), true)
$(info Using appended DTB)
TARGET_PREBUILT_INT_KERNEL := $(TARGET_PREBUILT_INT_KERNEL)-dtb
endif
KERNEL_HEADERS_INSTALL := $(KERNEL_OUT)/usr
KERNEL_MODULES_INSTALL := system
KERNEL_MODULES_OUT := $(TARGET_OUT)/lib/modules
# relative path from KERNEL_OUT to kernel source directory
KERNEL_SOURCE_RELATIVE_PATH := ../../../../../../kernel
TARGET_PREBUILT_KERNEL := $(TARGET_PREBUILT_INT_KERNEL)
$(info TARGET_PREBUILT_KERNEL is $(TARGET_PREBUILT_KERNEL))
define mv-modules
mdpath=`find $(KERNEL_MODULES_OUT) -type f -name modules.order`;\
if [ "$$mdpath" != "" ];then\
mpath=`dirname $$mdpath`;\
ko=`find $$mpath/kernel -type f -name *.ko`;\
for i in $$ko; do mv $$i $(KERNEL_MODULES_OUT)/; done;\
fi
endef
define clean-module-folder
mdpath=`find $(KERNEL_MODULES_OUT) -type f -name modules.order`;\
if [ "$$mdpath" != "" ];then\
mpath=`dirname $$mdpath`; rm -rf $$mpath;\
fi
endef
include kernel/defconfig.mk
KERNEL_HEADER_DEFCONFIG := $(strip $(KERNEL_HEADER_DEFCONFIG))
ifeq ($(KERNEL_HEADER_DEFCONFIG),)
KERNEL_HEADER_DEFCONFIG := $(TARGET_DEFCONFIG)
endif
define do-kernel-config
( cp $(3) $(2) && $(7) -C $(4) O=$(1) ARCH=$(5) CROSS_COMPILE=$(6) KBUILD_BUILD_USER=$(TARGET_KERNEL_BUILD_USER) KBUILD_BUILD_HOST=$(TARGET_KERNEL_BUILD_HOST) defoldconfig ) || ( rm -f $(2) && false )
endef
$(KERNEL_OUT):
mkdir -p $(KERNEL_OUT)
$(KERNEL_CONFIG): $(KERNEL_OUT) $(TARGET_DEFCONFIG)
$(call do-kernel-config,../$(KERNEL_OUT),$@,$(TARGET_DEFCONFIG),kernel,$(KERNEL_ARCH),$(KERNEL_CROSS_COMPILE),$(MAKE))
$(hide) if [ ! -z "$(KERNEL_CONFIG_OVERRIDE)" ]; then \
echo "Overriding kernel config with '$(KERNEL_CONFIG_OVERRIDE)'"; \
echo $(KERNEL_CONFIG_OVERRIDE) >> $(KERNEL_OUT)/.config; \
$(MAKE) -C kernel O=../$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) oldconfig; fi
$(TARGET_PREBUILT_INT_KERNEL): $(KERNEL_OUT) $(KERNEL_CONFIG) $(KERNEL_HEADERS_INSTALL)
$(hide) echo "Building kernel..."
$(hide) rm -rf $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/dts
$(MAKE) -C kernel KBUILD_RELSRC=$(KERNEL_SOURCE_RELATIVE_PATH) O=../$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) KBUILD_BUILD_USER=$(TARGET_KERNEL_BUILD_USER) KBUILD_BUILD_HOST=$(TARGET_KERNEL_BUILD_HOST) $(KERNEL_CFLAGS)
$(MAKE) -C kernel KBUILD_RELSRC=$(KERNEL_SOURCE_RELATIVE_PATH) O=../$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) KBUILD_BUILD_USER=$(TARGET_KERNEL_BUILD_USER) KBUILD_BUILD_HOST=$(TARGET_KERNEL_BUILD_HOST) $(KERNEL_CFLAGS) dtbs
$(MAKE) -C kernel KBUILD_RELSRC=$(KERNEL_SOURCE_RELATIVE_PATH) O=../$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) KBUILD_BUILD_USER=$(TARGET_KERNEL_BUILD_USER) KBUILD_BUILD_HOST=$(TARGET_KERNEL_BUILD_HOST) $(KERNEL_CFLAGS) modules
$(MAKE) -C kernel KBUILD_RELSRC=$(KERNEL_SOURCE_RELATIVE_PATH) O=../$(KERNEL_OUT) INSTALL_MOD_PATH=../../$(KERNEL_MODULES_INSTALL) INSTALL_MOD_STRIP="--strip-debug --remove-section=.note.gnu.build-id" ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) KBUILD_BUILD_USER=$(TARGET_KERNEL_BUILD_USER) KBUILD_BUILD_HOST=$(TARGET_KERNEL_BUILD_HOST) modules_install
$(mv-modules)
$(clean-module-folder)
$(KERNEL_HEADERS_INSTALL): $(KERNEL_OUT) $(KERNEL_CONFIG)
$(hide) if [ ! -z "$(KERNEL_HEADER_DEFCONFIG)" ]; then \
$(hide) rm -f ../$(KERNEL_CONFIG); \
$(call do-kernel-config,../$(KERNEL_OUT),$(KERNEL_CONFIG),$(KERNEL_HEADER_DEFCONFIG),kernel,$(KERNEL_HEADER_ARCH),$(KERNEL_CROSS_COMPILE),$(MAKE)); \
$(MAKE) -C kernel O=../$(KERNEL_OUT) ARCH=$(KERNEL_HEADER_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) KBUILD_BUILD_USER=$(TARGET_KERNEL_BUILD_USER) KBUILD_BUILD_HOST=$(TARGET_KERNEL_BUILD_HOST) headers_install; fi
$(hide) if [ "$(KERNEL_HEADER_DEFCONFIG)" != "$(KERNEL_DEFCONFIG)" ]; then \
echo "Used a different defconfig for header generation"; \
$(hide) rm -f ../$(KERNEL_CONFIG); \
$(call do-kernel-config,../$(KERNEL_OUT),$(KERNEL_CONFIG),$(TARGET_DEFCONFIG),kernel,$(KERNEL_ARCH),$(KERNEL_CROSS_COMPILE),$(MAKE)); fi
$(hide) if [ ! -z "$(KERNEL_CONFIG_OVERRIDE)" ]; then \
echo "Overriding kernel config with '$(KERNEL_CONFIG_OVERRIDE)'"; \
echo $(KERNEL_CONFIG_OVERRIDE) >> $(KERNEL_OUT)/.config; \
$(MAKE) -C kernel O=../$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) oldconfig; fi
kerneltags: $(KERNEL_OUT) $(KERNEL_CONFIG)
$(MAKE) -C kernel O=../$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) KBUILD_BUILD_USER=$(TARGET_KERNEL_BUILD_USER) KBUILD_BUILD_HOST=$(TARGET_KERNEL_BUILD_HOST) tags
kernelconfig: $(KERNEL_OUT) $(KERNEL_CONFIG)
env KCONFIG_NOTIMESTAMP=true \
$(MAKE) -C kernel O=../$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) KBUILD_BUILD_USER=$(TARGET_KERNEL_BUILD_USER) KBUILD_BUILD_HOST=$(TARGET_KERNEL_BUILD_HOST) menuconfig
env KCONFIG_NOTIMESTAMP=true \
$(MAKE) -C kernel O=../$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) KBUILD_BUILD_USER=$(TARGET_KERNEL_BUILD_USER) KBUILD_BUILD_HOST=$(TARGET_KERNEL_BUILD_HOST) savedefconfig
cp $(KERNEL_OUT)/defconfig kernel/arch/$(KERNEL_ARCH)/configs/$(KERNEL_DEFCONFIG)
endif
endif