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Android.mk
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# Copyright (C) 2012 The CyanogenMod Project
# Copyright (C) 2015 Chirayu Desai
#
# 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
ifeq ($(filter-out amami aries castor eagle flamingo honami leo scorpion seagull sirius tianchi,$(TARGET_DEVICE)),)
KERNEL_SRC := $(call my-dir)
# kernel configuration - mandatory:
TARGET_KERNEL_CONFIG ?= $(notdir $(wildcard $(KERNEL_SRC)/arch/arm/configs/aosp_*_$(TARGET_DEVICE)_defconfig))
KERNEL_DEFCONFIG := $(TARGET_KERNEL_CONFIG)
ifeq ($(OUT_DIR),out)
KERNEL_OUT := $(ANDROID_BUILD_TOP)/$(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ
else
KERNEL_OUT := $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ
endif
KERNEL_CONFIG := $(KERNEL_OUT)/.config
TARGET_KERNEL_ARCH := $(strip $(TARGET_KERNEL_ARCH))
ifeq ($(TARGET_KERNEL_ARCH),)
KERNEL_ARCH := $(TARGET_ARCH)
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
KERNEL_HEADER_ARCH := $(TARGET_KERNEL_HEADER_ARCH)
endif
KERNEL_HEADER_DEFCONFIG := $(strip $(KERNEL_HEADER_DEFCONFIG))
ifeq ($(KERNEL_HEADER_DEFCONFIG),)
KERNEL_HEADER_DEFCONFIG := $(KERNEL_DEFCONFIG)
endif
TARGET_PREBUILT_INT_KERNEL_TYPE := zImage
TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/$(TARGET_PREBUILT_INT_KERNEL_TYPE)
# Clear this first to prevent accidental poisoning from env
MAKE_FLAGS :=
ifeq ($(KERNEL_ARCH),arm64)
# Avoid "unsupported RELA relocation: 311" errors (R_AARCH64_ADR_GOT_PAGE)
MAKE_FLAGS += CFLAGS_MODULE="-fno-pic"
ifeq ($(TARGET_ARCH),arm)
KERNEL_CONFIG_OVERRIDE := CONFIG_ANDROID_BINDER_IPC_32BIT=y
endif
endif
KERNEL_BIN := $(TARGET_PREBUILT_INT_KERNEL)
KERNEL_HEADERS_INSTALL := $(KERNEL_OUT)/usr
KERNEL_MODULES_INSTALL := system
KERNEL_MODULES_OUT := $(TARGET_OUT)/lib/modules
TARGET_KERNEL_CROSS_COMPILE_PREFIX := $(strip $(TARGET_KERNEL_CROSS_COMPILE_PREFIX))
ifeq ($(TARGET_KERNEL_CROSS_COMPILE_PREFIX),)
ifeq ($(KERNEL_TOOLCHAIN_PREFIX),)
KERNEL_TOOLCHAIN_PREFIX := arm-eabi-
endif
else
KERNEL_TOOLCHAIN_PREFIX := $(TARGET_KERNEL_CROSS_COMPILE_PREFIX)
endif
ifeq ($(KERNEL_TOOLCHAIN),)
KERNEL_TOOLCHAIN_PATH := $(KERNEL_TOOLCHAIN_PREFIX)
else
ifneq ($(KERNEL_TOOLCHAIN_PREFIX),)
KERNEL_TOOLCHAIN_PATH := $(KERNEL_TOOLCHAIN)/$(KERNEL_TOOLCHAIN_PREFIX)
endif
endif
ifneq ($(USE_CCACHE),)
ccache := $(ANDROID_BUILD_TOP)/prebuilts/misc/$(HOST_PREBUILT_TAG)/ccache/ccache
# Check that the executable is here.
ccache := $(strip $(wildcard $(ccache)))
endif
KERNEL_CROSS_COMPILE := CROSS_COMPILE="$(ccache) $(KERNEL_TOOLCHAIN_PATH)"
ccache =
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 $(KERNEL_TOOLCHAIN_PATH)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 ($(HOST_OS),darwin)
MAKE_FLAGS += C_INCLUDE_PATH=$(ANDROID_BUILD_TOP)/external/elfutils/0.153/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_CONFIG): $(KERNEL_OUT)
$(MAKE) $(MAKE_FLAGS) -C $(KERNEL_SRC) O=$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) $(KERNEL_DEFCONFIG)
$(hide) if [ ! -z "$(KERNEL_CONFIG_OVERRIDE)" ]; then \
echo "Overriding kernel config with '$(KERNEL_CONFIG_OVERRIDE)'"; \
echo $(KERNEL_CONFIG_OVERRIDE) >> $(KERNEL_OUT)/.config; \
$(MAKE) -C $(KERNEL_SRC) O=$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) oldconfig; fi
TARGET_KERNEL_BINARIES: $(KERNEL_OUT) $(KERNEL_CONFIG) $(KERNEL_HEADERS_INSTALL)
$(MAKE) $(MAKE_FLAGS) -C $(KERNEL_SRC) O=$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) $(TARGET_PREBUILT_INT_KERNEL_TYPE)
-$(MAKE) $(MAKE_FLAGS) -C $(KERNEL_SRC) O=$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) dtbs
-$(MAKE) $(MAKE_FLAGS) -C $(KERNEL_SRC) O=$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) modules
-$(MAKE) $(MAKE_FLAGS) -C $(KERNEL_SRC) O=$(KERNEL_OUT) INSTALL_MOD_PATH=../../$(KERNEL_MODULES_INSTALL) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) modules_install
$(mv-modules)
$(clean-module-folder)
$(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)
$(hide) if [ ! -z "$(KERNEL_HEADER_DEFCONFIG)" ]; then \
rm -f ../$(KERNEL_CONFIG); \
$(MAKE) -C $(KERNEL_SRC) O=$(KERNEL_OUT) ARCH=$(KERNEL_HEADER_ARCH) $(KERNEL_CROSS_COMPILE) $(KERNEL_HEADER_DEFCONFIG); \
$(MAKE) -C $(KERNEL_SRC) O=$(KERNEL_OUT) ARCH=$(KERNEL_HEADER_ARCH) $(KERNEL_CROSS_COMPILE) headers_install; fi
$(hide) if [ "$(KERNEL_HEADER_DEFCONFIG)" != "$(KERNEL_DEFCONFIG)" ]; then \
echo "Used a different defconfig for header generation"; \
rm -f ../$(KERNEL_CONFIG); \
$(MAKE) -C $(KERNEL_SRC) O=$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) $(KERNEL_DEFCONFIG); 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 $(KERNEL_SRC) O=$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) oldconfig; fi
kerneltags: $(KERNEL_OUT) $(KERNEL_CONFIG)
$(MAKE) -C $(KERNEL_SRC) O=$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) tags
kernelconfig: $(KERNEL_OUT) $(KERNEL_CONFIG)
env KCONFIG_NOTIMESTAMP=true \
$(MAKE) -C $(KERNEL_SRC) O=$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) menuconfig
env KCONFIG_NOTIMESTAMP=true \
$(MAKE) -C $(KERNEL_SRC) O=$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) savedefconfig
cp $(KERNEL_OUT)/defconfig $(KERNEL_SRC)/arch/$(KERNEL_ARCH)/configs/$(KERNEL_DEFCONFIG)
## Install it
INSTALLED_KERNEL_TARGET ?= $(PRODUCT_OUT)/kernel
DTB_FILES := $(shell find -L $(KERNEL_OUT)/arch/arm/boot/dts/ -name "*.dtb")
DTBS := $(foreach dtb,$(DTB_FILES),$(PRODUCT_OUT)/dtbs/$(notdir $(dtb)))
$(DTBS) : $(DTB_FILES) | $(ACP)
$(hide) @mkdir -p $(PRODUCT_OUT)/dtbs
$(transform-prebuilt-to-target)
file := $(INSTALLED_KERNEL_TARGET)
ALL_PREBUILT += $(file)
$(file) : $(KERNEL_BIN) $(DTBS) | $(ACP)
$(transform-prebuilt-to-target)
ALL_PREBUILT += $(INSTALLED_KERNEL_TARGET)
endif # Sony AOSP devices