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326 lines
13 KiB
326 lines
13 KiB
# Copyright (C) 2012 The CyanogenMod Project
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# (C) 2017 The LineageOS Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# Android makefile to build kernel as a part of Android Build
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#
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# Configuration
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# =============
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#
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# These config vars are usually set in BoardConfig.mk:
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#
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# TARGET_KERNEL_CONFIG = Kernel defconfig
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# TARGET_KERNEL_VARIANT_CONFIG = Variant defconfig, optional
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# TARGET_KERNEL_SELINUX_CONFIG = SELinux defconfig, optional
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# TARGET_KERNEL_ADDITIONAL_CONFIG = Additional defconfig, optional
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#
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# TARGET_KERNEL_CLANG_COMPILE = Compile kernel with clang, defaults to false
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#
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# TARGET_KERNEL_CLANG_VERSION = Clang prebuilts version, optional, defaults to clang-stable
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#
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# TARGET_KERNEL_CLANG_PATH = Clang prebuilts path, optional
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#
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# BOARD_KERNEL_IMAGE_NAME = Built image name
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# for ARM use: zImage
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# for ARM64 use: Image.gz
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# for uncompressed use: Image
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# If using an appended DT, append '-dtb'
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# to the end of the image name.
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# For example, for ARM devices,
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# use zImage-dtb instead of zImage.
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#
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# KERNEL_CC = The C Compiler used. This is automatically set based
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# on whether the clang version is set, optional.
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# KERNEL_LD = The Linker used. This is automatically set based
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# on whether the clang/gcc version is set, optional.
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#
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# KERNEL_CLANG_TRIPLE = Target triple for clang (e.g. aarch64-linux-gnu-)
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# defaults to arm-linux-gnu- for arm
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# aarch64-linux-gnu- for arm64
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# x86_64-linux-gnu- for x86
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#
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# NEED_KERNEL_MODULE_ROOT = Optional, if true, install kernel
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# modules in root instead of vendor
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# NEED_KERNEL_MODULE_SYSTEM = Optional, if true, install kernel
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# modules in system instead of vendor
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ifneq ($(TARGET_NO_KERNEL),true)
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## Externally influenced variables
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KERNEL_SRC := $(TARGET_KERNEL_SOURCE)
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# kernel configuration - mandatory
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KERNEL_DEFCONFIG := $(TARGET_KERNEL_CONFIG)
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VARIANT_DEFCONFIG := $(TARGET_KERNEL_VARIANT_CONFIG)
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SELINUX_DEFCONFIG := $(TARGET_KERNEL_SELINUX_CONFIG)
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## Internal variables
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DTBS_OUT := $(PRODUCT_OUT)/dtbs
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KERNEL_OUT := $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ
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KERNEL_CONFIG := $(KERNEL_OUT)/.config
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KERNEL_RELEASE := $(KERNEL_OUT)/include/config/kernel.release
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ifeq ($(KERNEL_ARCH),x86_64)
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KERNEL_DEFCONFIG_ARCH := x86
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else
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KERNEL_DEFCONFIG_ARCH := $(KERNEL_ARCH)
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endif
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KERNEL_DEFCONFIG_DIR := $(KERNEL_SRC)/arch/$(KERNEL_DEFCONFIG_ARCH)/configs
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KERNEL_DEFCONFIG_SRC := $(KERNEL_DEFCONFIG_DIR)/$(KERNEL_DEFCONFIG)
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ifneq ($(TARGET_KERNEL_ADDITIONAL_CONFIG),)
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KERNEL_ADDITIONAL_CONFIG := $(TARGET_KERNEL_ADDITIONAL_CONFIG)
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KERNEL_ADDITIONAL_CONFIG_SRC := $(KERNEL_DEFCONFIG_DIR)/$(KERNEL_ADDITIONAL_CONFIG)
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ifeq ("$(wildcard $(KERNEL_ADDITIONAL_CONFIG_SRC))","")
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$(warning TARGET_KERNEL_ADDITIONAL_CONFIG '$(TARGET_KERNEL_ADDITIONAL_CONFIG)' doesn't exist)
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KERNEL_ADDITIONAL_CONFIG_SRC := /dev/null
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endif
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else
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KERNEL_ADDITIONAL_CONFIG_SRC := /dev/null
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endif
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ifeq ($(BOARD_KERNEL_IMAGE_NAME),)
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$(error BOARD_KERNEL_IMAGE_NAME not defined.)
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endif
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TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/$(BOARD_KERNEL_IMAGE_NAME)
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ifeq "$(wildcard $(KERNEL_SRC) )" ""
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ifneq ($(TARGET_PREBUILT_KERNEL),)
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HAS_PREBUILT_KERNEL := true
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NEEDS_KERNEL_COPY := true
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else
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$(foreach cf,$(PRODUCT_COPY_FILES), \
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$(eval _src := $(call word-colon,1,$(cf))) \
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$(eval _dest := $(call word-colon,2,$(cf))) \
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$(ifeq kernel,$(_dest), \
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$(eval HAS_PREBUILT_KERNEL := true)))
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endif
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ifneq ($(HAS_PREBUILT_KERNEL),)
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$(warning ***************************************************************)
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$(warning * Using prebuilt kernel binary instead of source *)
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$(warning * THIS IS DEPRECATED, AND IS NOT ADVISED. *)
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$(warning * Please configure your device to download the kernel *)
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$(warning * source repository to $(KERNEL_SRC))
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$(warning * for more information *)
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$(warning ***************************************************************)
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FULL_KERNEL_BUILD := false
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KERNEL_BIN := $(TARGET_PREBUILT_KERNEL)
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else
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$(warning ***************************************************************)
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$(warning * *)
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$(warning * No kernel source found, and no fallback prebuilt defined. *)
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$(warning * Please make sure your device is properly configured to *)
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$(warning * download the kernel repository to $(KERNEL_SRC))
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$(warning * and add the TARGET_KERNEL_CONFIG variable to BoardConfig.mk *)
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$(warning * *)
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$(warning * As an alternative, define the TARGET_PREBUILT_KERNEL *)
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$(warning * variable with the path to the prebuilt binary kernel image *)
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$(warning * in your BoardConfig.mk file *)
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$(warning * *)
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$(warning ***************************************************************)
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$(error "NO KERNEL")
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endif
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else
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NEEDS_KERNEL_COPY := true
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ifeq ($(TARGET_KERNEL_CONFIG),)
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$(warning **********************************************************)
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$(warning * Kernel source found, but no configuration was defined *)
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$(warning * Please add the TARGET_KERNEL_CONFIG variable to your *)
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$(warning * BoardConfig.mk file *)
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$(warning **********************************************************)
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# $(error "NO KERNEL CONFIG")
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else
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#$(info Kernel source found, building it)
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FULL_KERNEL_BUILD := true
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KERNEL_BIN := $(TARGET_PREBUILT_INT_KERNEL)
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endif
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endif
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ifeq ($(FULL_KERNEL_BUILD),true)
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ifeq ($(NEED_KERNEL_MODULE_ROOT),true)
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KERNEL_MODULES_OUT := $(TARGET_ROOT_OUT)
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KERNEL_DEPMOD_STAGING_DIR := $(KERNEL_BUILD_OUT_PREFIX)$(call intermediates-dir-for,PACKAGING,depmod_recovery)
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KERNEL_MODULE_MOUNTPOINT :=
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else ifeq ($(NEED_KERNEL_MODULE_SYSTEM),true)
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KERNEL_MODULES_OUT := $(TARGET_OUT)
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KERNEL_DEPMOD_STAGING_DIR := $(KERNEL_BUILD_OUT_PREFIX)$(call intermediates-dir-for,PACKAGING,depmod_system)
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KERNEL_MODULE_MOUNTPOINT := system
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else
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KERNEL_MODULES_OUT := $(TARGET_OUT_VENDOR)
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KERNEL_DEPMOD_STAGING_DIR := $(KERNEL_BUILD_OUT_PREFIX)$(call intermediates-dir-for,PACKAGING,depmod_vendor)
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KERNEL_MODULE_MOUNTPOINT := vendor
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endif
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MODULES_INTERMEDIATES := $(KERNEL_BUILD_OUT_PREFIX)$(call intermediates-dir-for,PACKAGING,kernel_modules)
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PATH_OVERRIDE :=
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ifeq ($(TARGET_KERNEL_CLANG_COMPILE),true)
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ifneq ($(TARGET_KERNEL_CLANG_VERSION),)
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KERNEL_CLANG_VERSION := clang-$(TARGET_KERNEL_CLANG_VERSION)
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else
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# Use the default version of clang if TARGET_KERNEL_CLANG_VERSION hasn't been set by the device config
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KERNEL_CLANG_VERSION := $(LLVM_PREBUILTS_VERSION)
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endif
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TARGET_KERNEL_CLANG_PATH ?= $(BUILD_TOP)/prebuilts/clang/host/$(HOST_OS)-x86/$(KERNEL_CLANG_VERSION)
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ifeq ($(KERNEL_ARCH),arm64)
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KERNEL_CLANG_TRIPLE ?= CLANG_TRIPLE=aarch64-linux-gnu-
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else ifeq ($(KERNEL_ARCH),arm)
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KERNEL_CLANG_TRIPLE ?= CLANG_TRIPLE=arm-linux-gnu-
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else ifeq ($(KERNEL_ARCH),x86)
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KERNEL_CLANG_TRIPLE ?= CLANG_TRIPLE=x86_64-linux-gnu-
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endif
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PATH_OVERRIDE += PATH=$(TARGET_KERNEL_CLANG_PATH)/bin:$$PATH LD_LIBRARY_PATH=$(TARGET_KERNEL_CLANG_PATH)/lib64:$$LD_LIBRARY_PATH
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ifeq ($(KERNEL_CC),)
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KERNEL_CC := CC="$(CCACHE_BIN) clang"
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endif
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ifeq ($(KERNEL_LD),)
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KERNEL_LD :=
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endif
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endif
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ifneq ($(TARGET_KERNEL_MODULES),)
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$(error TARGET_KERNEL_MODULES is no longer supported!)
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endif
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PATH_OVERRIDE += PATH=$(KERNEL_TOOLCHAIN_PATH_gcc)/bin:$$PATH
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# System tools are no longer allowed on 10+
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PATH_OVERRIDE += $(TOOLS_PATH_OVERRIDE)
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KERNEL_ADDITIONAL_CONFIG_OUT := $(KERNEL_OUT)/.additional_config
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# Internal implementation of make-kernel-target
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# $(1): output path (The value passed to O=)
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# $(2): target to build (eg. defconfig, modules, dtbo.img)
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define internal-make-kernel-target
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$(PATH_OVERRIDE) $(KERNEL_MAKE_CMD) $(KERNEL_MAKE_FLAGS) -C $(KERNEL_SRC) O=$(KERNEL_BUILD_OUT_PREFIX)$(1) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) $(KERNEL_CLANG_TRIPLE) $(KERNEL_CC) $(KERNEL_LD) $(2)
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endef
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# Make a kernel target
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# $(1): The kernel target to build (eg. defconfig, modules, modules_install)
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define make-kernel-target
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$(call internal-make-kernel-target,$(KERNEL_OUT),$(1))
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endef
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# Make a DTBO target
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# $(1): The DTBO target to build (eg. dtbo.img, defconfig)
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define make-dtbo-target
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$(call internal-make-kernel-target,$(PRODUCT_OUT)/dtbo,$(1))
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endef
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# Make a DTB targets
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# $(1): The DTB target to build (eg. dtbs, defconfig)
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define make-dtb-target
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$(call internal-make-kernel-target,$(DTBS_OUT),$(1))
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endef
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$(KERNEL_OUT):
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mkdir -p $(KERNEL_OUT)
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$(KERNEL_ADDITIONAL_CONFIG_OUT): $(KERNEL_OUT)
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$(hide) cmp -s $(KERNEL_ADDITIONAL_CONFIG_SRC) $@ || cp $(KERNEL_ADDITIONAL_CONFIG_SRC) $@;
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$(KERNEL_CONFIG): $(KERNEL_DEFCONFIG_SRC) $(KERNEL_ADDITIONAL_CONFIG_OUT)
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@echo "Building Kernel Config"
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$(call make-kernel-target,VARIANT_DEFCONFIG=$(VARIANT_DEFCONFIG) SELINUX_DEFCONFIG=$(SELINUX_DEFCONFIG) $(KERNEL_DEFCONFIG))
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$(hide) if [ ! -z "$(KERNEL_CONFIG_OVERRIDE)" ]; then \
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echo "Overriding kernel config with '$(KERNEL_CONFIG_OVERRIDE)'"; \
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echo $(KERNEL_CONFIG_OVERRIDE) >> $(KERNEL_OUT)/.config; \
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$(call make-kernel-target,oldconfig); \
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fi
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# Create defconfig build artifact
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$(call make-kernel-target,savedefconfig)
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$(hide) if [ ! -z "$(KERNEL_ADDITIONAL_CONFIG)" ]; then \
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echo "Using additional config '$(KERNEL_ADDITIONAL_CONFIG)'"; \
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$(KERNEL_SRC)/scripts/kconfig/merge_config.sh -m -O $(KERNEL_OUT) $(KERNEL_OUT)/.config $(KERNEL_SRC)/arch/$(KERNEL_ARCH)/configs/$(KERNEL_ADDITIONAL_CONFIG); \
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$(call make-kernel-target,KCONFIG_ALLCONFIG=$(KERNEL_OUT)/.config alldefconfig); \
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fi
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$(TARGET_PREBUILT_INT_KERNEL): $(KERNEL_CONFIG) $(DEPMOD)
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@echo "Building Kernel"
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$(call make-kernel-target,$(BOARD_KERNEL_IMAGE_NAME))
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$(hide) if grep -q '^CONFIG_OF=y' $(KERNEL_CONFIG); then \
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echo "Building DTBs"; \
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$(call make-kernel-target,dtbs); \
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fi
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$(hide) if grep -q '=m' $(KERNEL_CONFIG); then \
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echo "Building Kernel Modules"; \
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$(call make-kernel-target,modules) || exit "$$?"; \
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echo "Installing Kernel Modules"; \
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$(call make-kernel-target,INSTALL_MOD_PATH=$(MODULES_INTERMEDIATES) INSTALL_MOD_STRIP=1 modules_install); \
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kernel_release=$$(cat $(KERNEL_RELEASE)) \
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modules=$$(find $(MODULES_INTERMEDIATES)/lib/modules/$$kernel_release -type f -name '*.ko'); \
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($(call build-image-kernel-modules,$$modules,$(KERNEL_MODULES_OUT),$(KERNEL_MODULE_MOUNTPOINT)/,$(KERNEL_DEPMOD_STAGING_DIR))); \
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fi
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.PHONY: kerneltags
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kerneltags: $(KERNEL_CONFIG)
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$(call make-kernel-target,tags)
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.PHONY: kernelsavedefconfig alldefconfig
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kernelsavedefconfig: $(KERNEL_OUT)
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$(call make-kernel-target,$(KERNEL_DEFCONFIG))
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env KCONFIG_NOTIMESTAMP=true \
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$(call make-kernel-target,savedefconfig)
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cp $(KERNEL_OUT)/defconfig $(KERNEL_DEFCONFIG_SRC)
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alldefconfig: $(KERNEL_OUT)
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env KCONFIG_NOTIMESTAMP=true \
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$(call make-kernel-target,alldefconfig)
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ifeq ($(TARGET_NEEDS_DTBOIMAGE),true)
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$(BOARD_PREBUILT_DTBOIMAGE):
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echo -e ${CL_GRN}"Building DTBO.img"${CL_RST}
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$(call make-dtbo-target,$(KERNEL_DEFCONFIG))
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$(call make-dtbo-target,dtbo.img)
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endif # TARGET_NEEDS_DTBOIMAGE
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endif # FULL_KERNEL_BUILD
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## Install it
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ifeq ($(NEEDS_KERNEL_COPY),true)
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file := $(INSTALLED_KERNEL_TARGET)
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ALL_PREBUILT += $(file)
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$(file) : $(KERNEL_BIN) | $(ACP)
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$(transform-prebuilt-to-target)
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ALL_PREBUILT += $(INSTALLED_KERNEL_TARGET)
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endif
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INSTALLED_DTBOIMAGE_TARGET := $(PRODUCT_OUT)/dtbo.img
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ALL_PREBUILT += $(INSTALLED_DTBOIMAGE_TARGET)
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.PHONY: kernel
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kernel: $(INSTALLED_KERNEL_TARGET)
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.PHONY: dtboimage
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dtboimage: $(INSTALLED_DTBOIMAGE_TARGET)
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ifeq ($(BOARD_INCLUDE_DTB_IN_BOOTIMG),true)
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ifeq ($(BOARD_PREBUILT_DTBIMAGE_DIR),)
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$(INSTALLED_DTBIMAGE_TARGET):
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echo -e ${CL_GRN}"Building DTBs"${CL_RST}
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$(call make-dtb-target,$(KERNEL_DEFCONFIG))
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$(call make-dtb-target,dtbs)
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cat $(shell find $(DTBS_OUT)/arch/$(KERNEL_ARCH)/boot/dts/** -type f -name "*.dtb" | sort) > $@
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endif
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.PHONY: dtbimage
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dtbimage: $(INSTALLED_DTBIMAGE_TARGET)
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endif # BOARD_INCLUDE_DTB_IN_BOOTIMG
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endif # TARGET_NO_KERNEL
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