kernelscripts: Add snapshots of buildkernel.sh and kernel_definitions.mk

By default, the build.sh provides a mechanism to compile the kernel
as a standalone component, and is not helpful to compile from within
the Android tree. As a result, add the snapshots of kernel_definitions.mk
and buildkernel.sh files to support kernel compilation from within
the Android tree. The snaphot is taken from msm-4.19 branch as of
commit <0780fd437f12d401c> (kernel/build: remove wildcard entry for
updating makefile variable).

Change-Id: I63b3859a9c7d7b5bcf19320fe62235f432f9817a

1 files changed, 321 insertions, 0 deletions

diff --git a/buildkernel.sh b/buildkernel.sh
new file mode 100755
index 0000000..141ddf2
--- /dev/null
+++ b/buildkernel.sh
@@ -0,0 +1,321 @@
+#!/bin/bash -xE
+
+# Copyright (c) 2019 The Linux Foundation. All rights reserved.
+# Not a Contribution.
+#
+# Copyright (C) 2019 The Android Open Source 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.
+
+# Usage:
+#   build/build.sh <make options>*
+#
+# The kernel is built in ${COMMON_OUT_DIR}/${KERNEL_DIR}.
+
+set -e
+
+export ROOT_DIR=$(readlink -f $(dirname $0)/../../..)
+export MAKE_ARGS=$@
+export COMMON_OUT_DIR=$(readlink -m ${OUT_DIR:-${ROOT_DIR}/out/${BRANCH}})
+export OUT_DIR=$(readlink -m ${COMMON_OUT_DIR})
+export MODULES_STAGING_DIR=$(readlink -m ${COMMON_OUT_DIR}/staging)
+export KERNEL_PREBUILT_DIR=$(readlink -m ${KERNEL_DIR}/../ship_prebuilt)
+export MODULES_PRIVATE_DIR=$(readlink -m ${COMMON_OUT_DIR}/private)
+export DIST_DIR=$(readlink -m ${DIST_DIR:-${COMMON_OUT_DIR}/dist})
+export UNSTRIPPED_DIR=${DIST_DIR}/unstripped
+export CLANG_TRIPLE CROSS_COMPILE CROSS_COMPILE_ARM32 ARCH SUBARCH
+
+#Setting up for build
+PREBUILT_KERNEL_IMAGE=$(basename ${TARGET_PREBUILT_INT_KERNEL})
+IMAGE_FILE_PATH=arch/${ARCH}/boot
+KERNEL_GEN_HEADERS=include
+ARCH_GEN_HEADERS=arch/${ARCH}/include
+ARCH_GEN_HEADERS_LOC=arch/${ARCH}
+KERNEL_SCRIPTS=scripts
+FILES="
+vmlinux
+System.map
+"
+PRIMARY_KERN_BINS=${KERNEL_PREBUILT_DIR}/primary_kernel
+SECONDARY_KERN_BINS=${KERNEL_PREBUILT_DIR}/secondary_kernel
+KERN_SHA1_LOC=${KERNEL_PREBUILT_DIR}/kernel_sha1.txt
+
+#defconfig
+make_defconfig()
+{
+	if [ -z "${SKIP_DEFCONFIG}" ] ; then
+		echo "======================"
+		echo "Building defconfig"
+		set -x
+		(cd ${KERNEL_DIR} && \
+		make O=${OUT_DIR} ${MAKE_ARGS} HOSTCFLAGS="${TARGET_INCLUDES}" HOSTLDFLAGS="${TARGET_LINCLUDES}" ARCH=${ARCH} CROSS_COMPILE=${CROSS_COMPILE} ${DEFCONFIG})
+		set +x
+	fi
+}
+
+#Install headers
+headers_install()
+{
+	echo "======================"
+	echo "Installing kernel headers"
+	set -x
+	(cd ${OUT_DIR} && \
+	make HOSTCFLAGS="${TARGET_INCLUDES}" HOSTLDFLAGS="${TARGET_LINCLUDES}" ARCH=${ARCH} CROSS_COMPILE=${CROSS_COMPILE} O=${OUT_DIR} ${CC_ARG} ${MAKE_ARGS} headers_install)
+	set +x
+}
+
+# Building Kernel
+build_kernel()
+{
+	echo "======================"
+	echo "Building kernel"
+	set -x
+	(cd ${OUT_DIR} && \
+	make ARCH=${ARCH} CROSS_COMPILE=${CROSS_COMPILE} HOSTCFLAGS="${TARGET_INCLUDES}" HOSTLDFLAGS="${TARGET_LINCLUDES}" O=${OUT_DIR} ${CC_ARG} ${MAKE_ARGS} -j$(nproc))
+	set +x
+}
+
+# Modules Install
+modules_install()
+{
+	echo "======================"
+	echo "Installing kernel modules"
+	rm -rf ${MODULES_STAGING_DIR}
+	mkdir -p ${MODULES_STAGING_DIR}
+	set -x
+	(cd ${OUT_DIR} && \
+	make O=${OUT_DIR} ${CC_ARG} INSTALL_MOD_STRIP=1 INSTALL_MOD_PATH=${MODULES_STAGING_DIR} ${MAKE_ARGS} modules_install)
+	set +x
+}
+
+copy_modules_to_prebuilt()
+{
+	PREBUILT_OUT=$1
+
+	if [[ ! -e ${KERNEL_MODULES_OUT} ]]; then
+		mkdir -p ${KERNEL_MODULES_OUT}
+	fi
+
+	MODULES=$(find ${MODULES_STAGING_DIR} -type f -name "*.ko")
+	if [ -n "${MODULES}" ]; then
+		echo "======================"
+		echo " Copying modules files"
+		for FILE in ${MODULES}; do
+			echo "${FILE#${KERNEL_MODULES_OUT}/}"
+			cp -p ${FILE} ${KERNEL_MODULES_OUT}
+
+			# Copy for prebuilt
+			if [ ! -e ${PREBUILT_OUT}/${KERNEL_MODULES_OUT} ]; then
+				mkdir -p ${PREBUILT_OUT}/${KERNEL_MODULES_OUT}
+			fi
+			cp -p ${FILE} ${PREBUILT_OUT}/${KERNEL_MODULES_OUT}
+		done
+	fi
+
+	echo "Copying module signing certificate into prebuilt"
+	if [[ ! -e ${PREBUILT_OUT}/certs ]]; then
+		mkdir -p ${PREBUILT_OUT}/certs
+	fi
+	cp -p ${OUT_DIR}/certs/*.*  ${PREBUILT_OUT}/certs/
+}
+
+copy_all_to_prebuilt()
+{
+	PREBUILT_OUT=$1
+	echo ${PREBUILT_OUT}
+
+	if [[ ! -e ${PREBUILT_OUT} ]]; then
+		mkdir -p ${PREBUILT_OUT}
+	fi
+
+	copy_modules_to_prebuilt ${PREBUILT_OUT}
+
+	#copy necessary files from the out directory
+	echo "============="
+	echo "Copying files to prebuilt"
+	for FILE in ${FILES}; do
+	  if [ -f ${OUT_DIR}/${FILE} ]; then
+	    # Copy for prebuilt
+	    echo "$FILE ${PREBUILT_OUT}"
+	    cp -p ${OUT_DIR}/${FILE} ${PREBUILT_OUT}/
+	    echo $FILE copied to ${PREBUILT_OUT}
+	  else
+	    echo "$FILE does not exist, skipping"
+	  fi
+	done
+
+	#copy kernel image
+	echo "============="
+	echo "Copying kernel image to prebuilt"
+	if [ ! -e ${PREBUILT_OUT}/${IMAGE_FILE_PATH} ]; then
+		mkdir -p ${PREBUILT_OUT}/${IMAGE_FILE_PATH}
+	fi
+	cp -p ${OUT_DIR}/${IMAGE_FILE_PATH}/${PREBUILT_KERNEL_IMAGE} ${PREBUILT_OUT}/${IMAGE_FILE_PATH}/${PREBUILT_KERNEL_IMAGE}
+
+	#copy dtbo images to prebuilt
+	echo "============="
+	echo "Copying target dtb/dtbo files to prebuilt"
+	if [ ! -e ${PREBUILT_OUT}/${IMAGE_FILE_PATH}/dts/vendor/qcom ]; then
+		mkdir -p ${PREBUILT_OUT}/${IMAGE_FILE_PATH}/dts/vendor/qcom
+	fi
+	cp -p -r ${OUT_DIR}/${IMAGE_FILE_PATH}/dts/vendor/qcom/*.dtb ${PREBUILT_OUT}/${IMAGE_FILE_PATH}/dts/vendor/qcom/
+
+	if [ -f ${OUT_DIR}/${IMAGE_FILE_PATH}/dts/vendor/qcom/*.dtbo ]; then
+		cp -p -r ${OUT_DIR}/${IMAGE_FILE_PATH}/dts/vendor/qcom/*.dtbo ${PREBUILT_OUT}/${IMAGE_FILE_PATH}/dts/vendor/qcom/
+	fi
+
+	#copy arch generated headers
+	echo "============="
+	echo "Copying arch-specific generated headers to prebuilt"
+	cp -p -r ${OUT_DIR}/${ARCH_GEN_HEADERS} ${PREBUILT_OUT}/${ARCH_GEN_HEADERS_LOC}
+
+	#copy kernel generated headers
+	echo "============="
+	echo "Copying kernel generated headers to prebuilt"
+	cp -p -r ${OUT_DIR}/${KERNEL_GEN_HEADERS} ${PREBUILT_OUT}
+
+	#copy userspace facing headers
+	echo "============"
+	echo "Copying userspace headers to prebuilt"
+	mkdir -p ${PREBUILT_OUT}/usr
+	cp -p -r ${KERNEL_HEADERS_INSTALL}/include ${PREBUILT_OUT}/usr
+
+	#copy kernel scripts
+	echo "============"
+	echo "Copying kernel scripts to prebuilt"
+	cp -p -r ${OUT_DIR}/${KERNEL_SCRIPTS} ${PREBUILT_OUT}
+}
+
+extract_kernel_sha1()
+{
+	CUR_DIR=$(pwd)
+	cd ${KERNEL_DIR}
+	git rev-list --max-count=1 HEAD > ${KERN_SHA1_LOC}
+	cd ${CUR_DIR}
+}
+
+copy_from_prebuilt()
+{
+	PREBUILT_OUT=$1
+	cd ${ROOT_DIR}
+
+	if [ ! -e ${OUT_DIR} ]; then
+		mkdir -p ${OUT_DIR}
+	fi
+
+	#Copy userspace headers
+	echo "============"
+	echo "Copying userspace headers from prebuilt"
+	mkdir -p ${KERNEL_HEADERS_INSTALL}
+	cp -p -r ${PREBUILT_OUT}/usr/include ${ROOT_DIR}/${KERNEL_HEADERS_INSTALL}
+
+	#Copy files, such as System.map, vmlinux, etc
+	echo "============"
+	echo "Copying kernel files from prebuilt"
+	cd ${PREBUILT_OUT}
+	for FILE in ${FILES}; do
+		if [ -f ${PREBUILT_OUT}/$FILE ]; then
+			# Copy for prebuilt
+			echo "  $FILE ${PREBUILT_OUT}"
+			echo ${PREBUILT_OUT}/${FILE}
+			cp -p ${PREBUILT_OUT}/${FILE} ${OUT_DIR}/
+			echo $FILE copied to ${PREBUILT_OUT}
+		else
+			echo "$FILE does not exist, skipping"
+		fi
+	done
+
+	#copy kernel image
+	echo "============"
+	echo "Copying kernel image from prebuilt"
+	if [ ! -e ${OUT_DIR}/${IMAGE_FILE_PATH} ]; then
+		mkdir -p ${OUT_DIR}/${IMAGE_FILE_PATH}
+	fi
+	cp -p ${PREBUILT_OUT}/${IMAGE_FILE_PATH}/${PREBUILT_KERNEL_IMAGE} ${OUT_DIR}/${IMAGE_FILE_PATH}/${PREBUILT_KERNEL_IMAGE}
+
+	#copy dtbo images from prebuilt
+	echo "============="
+	echo "Copying dtb/dtbo files from prebuilt"
+	if [ ! -e ${OUT_DIR}/${IMAGE_FILE_PATH}/dts/vendor/qcom ]; then
+		mkdir -p ${OUT_DIR}/${IMAGE_FILE_PATH}/dts/vendor/qcom
+	fi
+	cp -p -r ${PREBUILT_OUT}/${IMAGE_FILE_PATH}/dts/vendor/qcom/*.dtb ${OUT_DIR}/${IMAGE_FILE_PATH}/dts/vendor/qcom/
+	cp -p -r ${PREBUILT_OUT}/${IMAGE_FILE_PATH}/dts/vendor/qcom/*.dtbo ${OUT_DIR}/${IMAGE_FILE_PATH}/dts/vendor/qcom/
+
+	#copy arch generated headers, and kernel generated headers
+	echo "============"
+	echo "Copying arch-specific generated headers from prebuilt"
+	cp -p -r ${PREBUILT_OUT}/${ARCH_GEN_HEADERS} ${OUT_DIR}/${ARCH_GEN_HEADERS_LOC}
+	echo "============"
+	echo "Copying kernel generated headers from prebuilt"
+	cp -p -r ${PREBUILT_OUT}/${KERNEL_GEN_HEADERS} ${OUT_DIR}
+
+	#copy modules
+	echo "============"
+	echo "Copying kernel modules from prebuilt"
+	cd ${ROOT_DIR}
+	MODULES=$(find ${PREBUILT_OUT} -type f -name "*.ko")
+	if [ ! -e  ${KERNEL_MODULES_OUT} ]; then
+		mkdir -p  ${KERNEL_MODULES_OUT}
+	fi
+	for FILE in ${MODULES}; do
+		echo "Copy ${FILE#${KERNEL_MODULES_OUT}/}"
+		cp -p ${FILE} ${KERNEL_MODULES_OUT}
+	done
+
+	#copy scripts directory
+	echo "============"
+	echo "Copying kernel scripts from prebuilt"
+	cp -p -r ${PREBUILT_OUT}/${KERNEL_SCRIPTS} ${OUT_DIR}
+
+	echo "Copying sign certificates from prebuilt"
+	if [[ ! -e ${OUT_DIR}/certs ]]; then
+		mkdir -p ${OUT_DIR}/certs
+	fi
+	cp -p -r ${PREBUILT_OUT}/certs ${OUT_DIR}
+
+}
+
+#script starts executing here
+if [ -n "${CC}" ]; then
+  CC_ARG="CC=${CC}"
+fi
+
+#choose between secondary and primary kernel image
+if [[ ${DEFCONFIG} == *"perf_defconfig" ]]; then
+	KERNEL_BINS=${SECONDARY_KERN_BINS}
+else
+	KERNEL_BINS=${PRIMARY_KERN_BINS}
+fi
+
+#use prebuilts if we want to use them, and they are available
+if [ ! -z ${USE_PREBUILT_KERNEL} ] && [ -d ${KERNEL_BINS} ]; then
+	make_defconfig
+	copy_from_prebuilt ${KERNEL_BINS}
+	exit 0
+fi
+
+#use kernel source for building
+if [ ! -z ${HEADERS_INSTALL} ]; then
+	make_defconfig
+	headers_install
+else
+	make_defconfig
+	headers_install
+	build_kernel
+	modules_install
+	copy_all_to_prebuilt ${KERNEL_BINS}
+	extract_kernel_sha1
+fi
+
+exit 0