build/tasks/kernel.mk

   1 #
   2 # Copyright (C) 2014-2017 The Android-x86 Open Source Project
   3 #
   4 # Licensed under the Apache License, Version 2.0 (the "License");
   5 # you may not use this file except in compliance with the License.
   6 # You may obtain a copy of the License at
   7 #
   8 #      http://www.apache.org/licenses/LICENSE-2.0
   9 #
  10
  11 ifneq ($(TARGET_NO_KERNEL),true)
  12 ifeq ($(TARGET_PREBUILT_KERNEL),)
  13
  14 KERNEL_DIR ?= kernel
  15
  16 ifneq ($(filter x86%,$(TARGET_ARCH)),)
  17 TARGET_KERNEL_ARCH ?= $(TARGET_ARCH)
  18 KERNEL_TARGET := bzImage
  19 TARGET_KERNEL_CONFIG ?= android-$(TARGET_KERNEL_ARCH)_defconfig
  20 KERNEL_CONFIG_DIR := arch/x86/configs
  21 endif
  22 ifeq ($(TARGET_ARCH),arm)
  23 KERNEL_TARGET := zImage
  24 TARGET_KERNEL_CONFIG ?= goldfish_defconfig
  25 KERNEL_CONFIG_DIR := arch/arm/configs
  26 endif
  27
  28 ifeq ($(BUILD_KERNEL_WITH_CLANG),true)
  29 CROSS_COMPILE := x86_64-linux-androidkernel-
  30 KERNEL_CLANG_CLAGS := CC=clang HOSTCC=clang CLANG_TRIPLE=x86_64-linux-gnu- PATH=$(abspath $(LLVM_PREBUILTS_BASE)/$(BUILD_OS)-x86/$(LLVM_PREBUILTS_VERSION)/bin):$$PATH
  31 else
  32 ifeq ($(TARGET_KERNEL_ARCH),x86_64)
  33 CROSS_COMPILE ?= $(abspath prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.6/bin)/x86_64-linux-
  34 else
  35 CROSS_COMPILE ?= $(abspath $(TARGET_TOOLS_PREFIX))
  36 endif
  37 endif
  38 KBUILD_OUTPUT := $(abspath $(TARGET_OUT_INTERMEDIATES)/kernel)
  39 mk_kernel := + $(hide) $(MAKE) $(if $(filter darwin,$(HOST_OS)),,-j$$(nproc) -l$$(($$(nproc)+2))) -C $(KERNEL_DIR) O=$(KBUILD_OUTPUT) ARCH=$(TARGET_ARCH) CROSS_COMPILE="$(abspath $(CC_WRAPPER)) $(CROSS_COMPILE)" $(if $(SHOW_COMMANDS),V=1) $(KERNEL_CLANG_CLAGS)
  40
  41 KERNEL_CONFIG_FILE := $(if $(wildcard $(TARGET_KERNEL_CONFIG)),$(TARGET_KERNEL_CONFIG),$(KERNEL_DIR)/$(KERNEL_CONFIG_DIR)/$(TARGET_KERNEL_CONFIG))
  42
  43 MOD_ENABLED := $(shell grep ^CONFIG_MODULES=y $(KERNEL_CONFIG_FILE))
  44 FIRMWARE_ENABLED := $(shell grep ^CONFIG_FIRMWARE_IN_KERNEL=y $(KERNEL_CONFIG_FILE))
  45
  46 # I understand Android build system discourage to use submake,
  47 # but I don't want to write a complex Android.mk to build kernel.
  48 # This is the simplest way I can think.
  49 KERNEL_DOTCONFIG_FILE := $(KBUILD_OUTPUT)/.config
  50 KERNEL_ARCH_CHANGED := $(if $(filter 0,$(shell grep -s ^$(if $(filter x86,$(TARGET_KERNEL_ARCH)),\#.)CONFIG_64BIT $(KERNEL_DOTCONFIG_FILE) | wc -l)),FORCE)
  51 $(KERNEL_DOTCONFIG_FILE): $(KERNEL_CONFIG_FILE) $(wildcard $(TARGET_KERNEL_DIFFCONFIG)) $(KERNEL_ARCH_CHANGED)
  52         $(hide) mkdir -p $(@D) && cat $(wildcard $^) > $@
  53         $(hide) ln -sf ../../../../../../external $(@D)
  54         $(mk_kernel) oldnoconfig
  55
  56 # bison is needed to build kernel and external modules from source
  57 BISON := $(HOST_OUT_EXECUTABLES)/bison$(HOST_EXECUTABLE_SUFFIX)
  58
  59 BUILT_KERNEL_TARGET := $(KBUILD_OUTPUT)/arch/$(TARGET_ARCH)/boot/$(KERNEL_TARGET)
  60 $(BUILT_KERNEL_TARGET): $(KERNEL_DOTCONFIG_FILE) | $(BISON)
  61         $(mk_kernel) $(KERNEL_TARGET) $(if $(MOD_ENABLED),modules)
  62         $(if $(FIRMWARE_ENABLED),$(mk_kernel) INSTALL_MOD_PATH=$(abspath $(TARGET_OUT)) firmware_install)
  63
  64 ifneq ($(MOD_ENABLED),)
  65 KERNEL_MODULES_DEP := $(firstword $(wildcard $(TARGET_OUT)/lib/modules/*/modules.dep))
  66 KERNEL_MODULES_DEP := $(if $(KERNEL_MODULES_DEP),$(KERNEL_MODULES_DEP),$(TARGET_OUT)/lib/modules)
  67
  68 ALL_EXTRA_MODULES := $(patsubst %,$(TARGET_OUT_INTERMEDIATES)/kmodule/%,$(TARGET_EXTRA_KERNEL_MODULES))
  69 $(ALL_EXTRA_MODULES): $(TARGET_OUT_INTERMEDIATES)/kmodule/%: $(BUILT_KERNEL_TARGET)
  70         @echo Building additional kernel module $*
  71         $(hide) mkdir -p $(@D) && $(ACP) -fr $(EXTRA_KERNEL_MODULE_PATH_$*) $(@D)
  72         $(mk_kernel) M=$(abspath $@) modules
  73
  74 $(KERNEL_MODULES_DEP): $(BUILT_KERNEL_TARGET) $(ALL_EXTRA_MODULES)
  75         $(hide) rm -rf $(TARGET_OUT)/lib/modules
  76         $(mk_kernel) INSTALL_MOD_PATH=$(abspath $(TARGET_OUT)) modules_install
  77         + $(hide) for kmod in $(TARGET_EXTRA_KERNEL_MODULES) ; do \
  78                 echo Installing additional kernel module $${kmod} ; \
  79                 $(subst +,,$(subst $(hide),,$(mk_kernel))) INSTALL_MOD_PATH=$(abspath $(TARGET_OUT)) M=$(abspath $(TARGET_OUT_INTERMEDIATES))/kmodule/$${kmod} modules_install ; \
  80         done
  81         $(hide) rm -f $(TARGET_OUT)/lib/modules/*/{build,source}
  82 endif
  83
  84 $(BUILT_SYSTEMIMAGE): $(KERNEL_MODULES_DEP)
  85
  86 # rules to get source of Broadcom 802.11a/b/g/n hybrid device driver
  87 # based on broadcomsetup.sh of Kyle Evans
  88 WL_PATH := $(KERNEL_DIR)/drivers/net/wireless/broadcom/wl
  89 ifeq ($(wildcard $(WL_PATH)/build.mk),)
  90 WL_PATH := $(KERNEL_DIR)/drivers/net/wireless/wl
  91 endif
  92 -include $(WL_PATH)/build.mk
  93
  94 installclean: FILES += $(KBUILD_OUTPUT) $(INSTALLED_KERNEL_TARGET)
  95
  96 TARGET_PREBUILT_KERNEL := $(BUILT_KERNEL_TARGET)
  97
  98 .PHONY: kernel $(if $(KERNEL_ARCH_CHANGED),$(KERNEL_HEADERS_COMMON)/linux/binder.h)
  99 kernel: $(INSTALLED_KERNEL_TARGET)
 100
 101 endif # TARGET_PREBUILT_KERNEL
 102
 103 ifndef LINEAGE_BUILD
 104 $(INSTALLED_KERNEL_TARGET): $(TARGET_PREBUILT_KERNEL) | $(ACP)
 105         $(copy-file-to-new-target)
 106 ifdef TARGET_PREBUILT_MODULES
 107         mkdir -p $(TARGET_OUT)/lib
 108         $(hide) cp -r $(TARGET_PREBUILT_MODULES) $(TARGET_OUT)/lib
 109 endif
 110 endif # LINEAGE_BUILD
 111 endif # KBUILD_OUTPUT