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# Copyright (C) 2012 The CyanogenMod 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
TARGET_AUTO_KDIR := $(shell echo $(TARGET_DEVICE_DIR) | sed -e 's/^device/kernel/g')
## Externally influenced variables
# kernel location - optional, defaults to kernel/<vendor>/<device>
TARGET_KERNEL_SOURCE ?= $(TARGET_AUTO_KDIR)
KERNEL_SRC := $(TARGET_KERNEL_SOURCE)
# kernel configuration - mandatory
KERNEL_DEFCONFIG := $(TARGET_KERNEL_CONFIG)
KERNEL_RECOVERY_DEFCONFIG := $(TARGET_KERNEL_RECOVERY_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_RECOVERY_OUT := $(TARGET_OUT_INTERMEDIATES)/KERNEL_RECOVERY_OBJ
KERNEL_RECOVERY_CONFIG := $(KERNEL_RECOVERY_OUT)/.config
ifeq ($(BOARD_USES_UBOOT),true)
TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(TARGET_ARCH)/boot/uImage
TARGET_PREBUILT_INT_KERNEL_RECOVERY := $(KERNEL_RECOVERY_OUT)/arch/$(TARGET_ARCH)/boot/uImage
TARGET_PREBUILT_INT_KERNEL_TYPE := uImage
else ifeq ($(BOARD_USES_UNCOMPRESSED_BOOT),true)
TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(TARGET_ARCH)/boot/Image
TARGET_PREBUILT_INT_KERNEL_RECOVERY := $(KERNEL_RECOVERY_OUT)/arch/$(TARGET_ARCH)/boot/Image
TARGET_PREBUILT_INT_KERNEL_TYPE := Image
else
TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(TARGET_ARCH)/boot/zImage
TARGET_PREBUILT_INT_KERNEL_RECOVERY := $(KERNEL_RECOVERY_OUT)/arch/$(TARGET_ARCH)/boot/zImage
TARGET_PREBUILT_INT_KERNEL_TYPE := zImage
endif
ifneq ($(TARGET_KERNEL_LOADADDR),)
KERNEL_LOADADDR := LOADADDR=$(TARGET_KERNEL_LOADADDR)
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 * See http://wiki.cyanogenmod.org/w/Doc:_integrated_kernel_building)
$(warning * for more information *)
$(warning ***************************************************************)
FULL_KERNEL_BUILD := false
KERNEL_BIN := $(TARGET_PREBUILT_KERNEL)
KERNEL_RECOVERY_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
ifeq ($(TARGET_USES_UNCOMPRESSED_KERNEL),true)
$(info Using uncompressed kernel)
KERNEL_BIN := $(KERNEL_OUT)/piggy
else
KERNEL_BIN := $(TARGET_PREBUILT_INT_KERNEL)
endif
endif
ifneq ($(TARGET_KERNEL_RECOVERY_CONFIG),)
FULL_KERNEL_BUILD := true
ifeq ($(TARGET_USES_UNCOMPRESSED_KERNEL),true)
$(info Using uncompressed kernel)
KERNEL_RECOVERY_BIN := $(KERNEL_RECOVERY_OUT)/piggy
else
KERNEL_RECOVERY_BIN := $(TARGET_PREBUILT_INT_KERNEL_RECOVERY)
endif
endif
endif
ifeq ($(FULL_KERNEL_BUILD),true)
KERNEL_HEADERS_INSTALL := $(KERNEL_OUT)/usr
KERNEL_MODULES_INSTALL := system
KERNEL_MODULES_OUT := $(TARGET_OUT)/lib/modules
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 $(ARM_EABI_TOOLCHAIN)/arm-eabi-strip --strip-unneeded $$i;\
mv $$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
ifeq ($(TARGET_ARCH),arm)
ifneq ($(USE_CCACHE),)
# search executable
ccache =
ifneq ($(strip $(wildcard $(ANDROID_BUILD_TOP)/prebuilts/misc/$(HOST_PREBUILT_EXTRA_TAG)/ccache/ccache)),)
ccache := $(ANDROID_BUILD_TOP)/prebuilts/misc/$(HOST_PREBUILT_EXTRA_TAG)/ccache/ccache
else
ifneq ($(strip $(wildcard $(ANDROID_BUILD_TOP)/prebuilts/misc/$(HOST_PREBUILT_TAG)/ccache/ccache)),)
ccache := $(ANDROID_BUILD_TOP)/prebuilts/misc/$(HOST_PREBUILT_TAG)/ccache/ccache
endif
endif
endif
ifneq ($(TARGET_KERNEL_CUSTOM_TOOLCHAIN),)
ifeq ($(HOST_OS),darwin)
ARM_CROSS_COMPILE:=CROSS_COMPILE="$(ccache) $(ANDROID_BUILD_TOP)/prebuilt/darwin-x86/toolchain/$(TARGET_KERNEL_CUSTOM_TOOLCHAIN)/bin/arm-eabi-"
else
ARM_CROSS_COMPILE:=CROSS_COMPILE="$(ccache) $(ANDROID_BUILD_TOP)/prebuilt/linux-x86/toolchain/$(TARGET_KERNEL_CUSTOM_TOOLCHAIN)/bin/arm-eabi-"
endif
else
ARM_CROSS_COMPILE:=CROSS_COMPILE="$(ccache) $(ARM_EABI_TOOLCHAIN)/arm-eabi-"
endif
ccache =
endif
ifeq ($(HOST_OS),darwin)
MAKE_FLAGS := C_INCLUDE_PATH=$(ANDROID_BUILD_TOP)/external/elfutils/libelf
endif
ifeq ($(TARGET_KERNEL_MODULES),)
TARGET_KERNEL_MODULES := no-external-modules
endif
$(KERNEL_OUT):
mkdir -p $(KERNEL_OUT)
mkdir -p $(KERNEL_MODULES_OUT)
$(KERNEL_RECOVERY_OUT):
mkdir -p $(KERNEL_RECOVERY_OUT)
$(KERNEL_CONFIG): $(KERNEL_OUT)
$(MAKE) $(MAKE_FLAGS) -C $(KERNEL_SRC) O=$(KERNEL_OUT) ARCH=$(TARGET_ARCH) $(ARM_CROSS_COMPILE) VARIANT_DEFCONFIG=$(VARIANT_DEFCONFIG) SELINUX_DEFCONFIG=$(SELINUX_DEFCONFIG) $(KERNEL_DEFCONFIG)
$(KERNEL_RECOVERY_CONFIG): $(KERNEL_RECOVERY_OUT)
$(MAKE) $(MAKE_FLAGS) -C $(KERNEL_SRC) O=$(KERNEL_RECOVERY_OUT) ARCH=$(TARGET_ARCH) $(ARM_CROSS_COMPILE) $(KERNEL_RECOVERY_DEFCONFIG)
$(KERNEL_OUT)/piggy : $(TARGET_PREBUILT_INT_KERNEL)
$(hide) gunzip -c $(KERNEL_OUT)/arch/$(TARGET_ARCH)/boot/compressed/piggy.gzip > $(KERNEL_OUT)/piggy
$(KERNEL_RECOVERY_OUT)/piggy : $(TARGET_PREBUILT_INT_KERNEL_RECOVERY)
$(hide) gunzip -c $(KERNEL_OUT)/arch/$(TARGET_ARCH)/boot/compressed/piggy.gzip > $(KERNEL_RECOVERY_OUT)/piggy
TARGET_KERNEL_BINARIES: $(BUILT_RAMDISK_TARGET) $(KERNEL_OUT) $(KERNEL_CONFIG) $(KERNEL_HEADERS_INSTALL)
$(MAKE) $(MAKE_FLAGS) -C $(KERNEL_SRC) O=$(KERNEL_OUT) ARCH=$(TARGET_ARCH) $(ARM_CROSS_COMPILE) $(KERNEL_LOADADDR) $(TARGET_PREBUILT_INT_KERNEL_TYPE)
-$(MAKE) $(MAKE_FLAGS) -C $(KERNEL_SRC) O=$(KERNEL_OUT) ARCH=$(TARGET_ARCH) $(ARM_CROSS_COMPILE) modules
-$(MAKE) $(MAKE_FLAGS) -C $(KERNEL_SRC) O=$(KERNEL_OUT) INSTALL_MOD_PATH=../../$(KERNEL_MODULES_INSTALL) ARCH=$(TARGET_ARCH) $(ARM_CROSS_COMPILE) modules_install
$(mv-modules)
$(clean-module-folder)
$(TARGET_PREBUILT_INT_KERNEL_RECOVERY): $(recovery_ramdisk) $(KERNEL_RECOVERY_OUT) $(KERNEL_RECOVERY_CONFIG)
$(MAKE) $(MAKE_FLAGS) -C $(KERNEL_SRC) O=$(KERNEL_RECOVERY_OUT) ARCH=$(TARGET_ARCH) $(ARM_CROSS_COMPILE) $(KERNEL_LOADADDR) $(TARGET_PREBUILT_INT_KERNEL_TYPE)
$(TARGET_KERNEL_MODULES): TARGET_KERNEL_BINARIES
$(TARGET_PREBUILT_INT_KERNEL): $(TARGET_KERNEL_MODULES)
$(mv-modules)
$(clean-module-folder)
$(KERNEL_HEADERS_INSTALL): $(KERNEL_OUT) $(KERNEL_CONFIG)
$(MAKE) $(MAKE_FLAGS) -C $(KERNEL_SRC) O=$(KERNEL_OUT) ARCH=$(TARGET_ARCH) $(ARM_CROSS_COMPILE) headers_install
endif # FULL_KERNEL_BUILD
## Install it
ifeq ($(NEEDS_KERNEL_COPY),true)
installed_kernel := $(INSTALLED_KERNEL_TARGET)
ALL_PREBUILT += $(installed_kernel)
$(installed_kernel) : $(KERNEL_BIN) | $(ACP)
$(transform-prebuilt-to-target)
ALL_PREBUILT += $(INSTALLED_KERNEL_TARGET)
installed_recovery_kernel := $(INSTALLED_RECOVERY_KERNEL_TARGET)
ALL_PREBUILT += $(installed_recovery_kernel)
$(installed_recovery_kernel) : $(KERNEL_RECOVERY_BIN) | $(ACP)
$(transform-prebuilt-to-target)
ALL_PREBUILT += $(INSTALLED_RECOVERY_KERNEL_TARGET)
endif
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