build: integrate with Android build

Add Android.mk to build with Android.

Change-Id: Ibf75136736c2e95f842bffa26e54b32abd0943ce
CR-Id: ALPS04286006
Feature: build process
Signed-off-by: Celeste Wang <celeste.wang@mediatek.com>

Android.mk

@@ -0,0 +1,56 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2019 MediaTek Inc.
+
+LOCAL_PATH := $(call my-dir)
+
+ifeq ($(notdir $(LOCAL_PATH)),$(strip $(LINUX_KERNEL_VERSION)))
+ifneq ($(strip $(TARGET_NO_KERNEL)),true)
+
+include $(LOCAL_PATH)/kenv.mk
+
+ifeq ($(wildcard $(TARGET_PREBUILT_KERNEL)),)
+# .config cannot be PHONY due to config_data.gz
+$(TARGET_KERNEL_CONFIG): $(KERNEL_CONFIG_FILE) $(LOCAL_PATH)/Android.mk
+$(TARGET_KERNEL_CONFIG): $(shell find $(KERNEL_DIR) -name "Kconfig*")
+	$(hide) mkdir -p $(dir $@)
+	$(MAKE) -C $(KERNEL_DIR) $(KERNEL_MAKE_OPTION) $(KERNEL_DEFCONFIG)
+
+.KATI_RESTAT: $(KERNEL_ZIMAGE_OUT)
+$(KERNEL_ZIMAGE_OUT): $(TARGET_KERNEL_CONFIG) FORCE
+	$(hide) mkdir -p $(dir $@)
+	$(MAKE) -C $(KERNEL_DIR) $(KERNEL_MAKE_OPTION)
+	$(hide) $(call fixup-kernel-cmd-file,$(KERNEL_OUT)/arch/$(KERNEL_TARGET_ARCH)/boot/compressed/.piggy.xzkern.cmd)
+	# check the kernel image size
+	python device/mediatek/build/build/tools/check_kernel_size.py $(KERNEL_OUT) $(KERNEL_DIR)
+
+$(BUILT_KERNEL_TARGET): $(KERNEL_ZIMAGE_OUT) $(TARGET_KERNEL_CONFIG) $(LOCAL_PATH)/Android.mk | $(ACP)
+	$(copy-file-to-target)
+
+$(TARGET_PREBUILT_KERNEL): $(BUILT_KERNEL_TARGET) $(LOCAL_PATH)/Android.mk | $(ACP)
+	$(copy-file-to-new-target)
+
+endif #TARGET_PREBUILT_KERNEL is empty
+
+$(INSTALLED_KERNEL_TARGET): $(BUILT_KERNEL_TARGET) $(LOCAL_PATH)/Android.mk | $(ACP)
+	$(copy-file-to-target)
+
+.PHONY: kernel save-kernel kernel-savedefconfig %config-kernel clean-kernel
+kernel: $(INSTALLED_KERNEL_TARGET)
+save-kernel: $(TARGET_PREBUILT_KERNEL)
+
+kernel-savedefconfig: $(TARGET_KERNEL_CONFIG)
+	cp $(TARGET_KERNEL_CONFIG) $(KERNEL_CONFIG_FILE)
+
+kernel-menuconfig:
+	$(hide) mkdir -p $(KERNEL_OUT)
+	$(MAKE) -C $(KERNEL_DIR) $(KERNEL_MAKE_OPTION) menuconfig
+
+%config-kernel:
+	$(hide) mkdir -p $(KERNEL_OUT)
+	$(MAKE) -C $(KERNEL_DIR) $(KERNEL_MAKE_OPTION) $(patsubst %config-kernel,%config,$@)
+
+clean-kernel:
+	$(hide) rm -rf $(KERNEL_OUT) $(INSTALLED_KERNEL_TARGET)
+
+endif #TARGET_NO_KERNEL
+endif #LINUX_KERNEL_VERSION

CleanSpec.mk

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2019 MediaTek Inc.
+
+# dummy file
+# To avoid scanning kernel when using findleaves.py to search CleanSpec.mk

kenv.mk

@@ -0,0 +1,53 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2019 MediaTek Inc.
+
+KERNEL_ENV_PATH := $(call my-dir)
+KERNEL_ROOT_DIR := $(PWD)
+
+define touch-kernel-image-timestamp
+if [ -e $(1) ] && [ -e $(2) ] && cmp -s $(1) $(2); then \
+ echo $(2) has no change;\
+ mv -f $(1) $(2);\
+else \
+ rm -f $(1);\
+fi
+endef
+
+# '\\' in command is wrongly replaced to '\\\\' in kernel/out/arch/arm/boot/compressed/.piggy.xzkern.cmd
+define fixup-kernel-cmd-file
+if [ -e $(1) ]; then cp $(1) $(1).bak; sed -e 's/\\\\\\\\/\\\\/g' < $(1).bak > $(1); rm -f $(1).bak; fi
+endef
+
+ifneq ($(strip $(TARGET_NO_KERNEL)),true)
+  KERNEL_DIR := $(KERNEL_ENV_PATH)
+
+  ifeq ($(KERNEL_TARGET_ARCH),arm64)
+    TARGET_KERNEL_CROSS_COMPILE ?= $(KERNEL_ROOT_DIR)/prebuilts/gcc/$(HOST_PREBUILT_TAG)/aarch64/aarch64-linux-android-4.9/bin/aarch64-linux-android-
+    ifeq ($(strip $(TARGET_KERNEL_USE_CLANG)),true)
+      TARGET_KERNEL_CLANG_COMPILE := CLANG_TRIPLE=aarch64-linux-gnu- CC=$(KERNEL_ROOT_DIR)/${LLVM_PREBUILTS_PATH}/clang
+    endif
+  else
+    TARGET_KERNEL_CROSS_COMPILE ?= $(KERNEL_ROOT_DIR)/prebuilts/gcc/$(HOST_PREBUILT_TAG)/arm/arm-linux-androideabi-4.9/bin/arm-linux-androideabi-
+    # No CLANG support for arm yet
+    TARGET_KERNEL_CLANG_COMPILE :=
+  endif
+
+  ifeq ($(wildcard $(TARGET_PREBUILT_KERNEL)),)
+    KERNEL_OUT ?= $(if $(filter /% ~%,$(TARGET_OUT_INTERMEDIATES)),,$(KERNEL_ROOT_DIR)/)$(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ
+    ifeq ($(KERNEL_TARGET_ARCH), arm64)
+        KERNEL_ZIMAGE_OUT := $(KERNEL_OUT)/arch/$(KERNEL_TARGET_ARCH)/boot/Image.gz
+    else
+        KERNEL_ZIMAGE_OUT := $(KERNEL_OUT)/arch/$(KERNEL_TARGET_ARCH)/boot/zImage
+    endif
+
+    BUILT_KERNEL_TARGET := $(KERNEL_ZIMAGE_OUT).bin
+    INSTALLED_KERNEL_TARGET := $(PRODUCT_OUT)/kernel
+    TARGET_KERNEL_CONFIG := $(KERNEL_OUT)/.config
+    KERNEL_CONFIG_FILE := $(KERNEL_DIR)/arch/$(KERNEL_TARGET_ARCH)/configs/$(KERNEL_DEFCONFIG)
+    KERNEL_MAKE_OPTION := O=$(KERNEL_OUT) ARCH=$(KERNEL_TARGET_ARCH) CROSS_COMPILE=$(TARGET_KERNEL_CROSS_COMPILE) $(TARGET_KERNEL_CLANG_COMPILE) ROOTDIR=$(KERNEL_ROOT_DIR) $(if $(strip $(SHOW_COMMANDS)),V=1)
+
+  else
+    BUILT_KERNEL_TARGET := $(TARGET_PREBUILT_KERNEL)
+  endif #TARGET_PREBUILT_KERNEL is empty
+
+endif #TARGET_NO_KERNEL