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 export LC_CTYPE := C
  12
  13 ifneq ($(TARGET_NO_KERNEL),true)
  14 ifeq ($(TARGET_PREBUILT_KERNEL),)
  15
  16 KERNEL_DIR ?= kernel
  17
  18 ifneq ($(filter x86%,$(TARGET_ARCH)),)
  19 TARGET_KERNEL_ARCH ?= $(TARGET_ARCH)
  20 KERNEL_TARGET := bzImage
  21 TARGET_KERNEL_CONFIG ?= android-$(TARGET_KERNEL_ARCH)_defconfig
  22 KERNEL_CONFIG_DIR := arch/x86/configs
  23 endif
  24 ifeq ($(TARGET_ARCH),arm)
  25 KERNEL_TARGET := zImage
  26 TARGET_KERNEL_CONFIG ?= goldfish_defconfig
  27 KERNEL_CONFIG_DIR := arch/arm/configs
  28 endif
  29
  30 ifeq ($(BUILD_KERNEL_WITH_CLANG),true)
  31 CROSS_COMPILE := x86_64-linux-androidkernel-
  32 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):$$PATH
  33 else
  34 ifeq ($(TARGET_KERNEL_ARCH),x86_64)
  35 ifeq ($(HOST_OS),darwin)
  36 CROSS_COMPILE ?= $(abspath prebuilts/gcc/darwin-x86/host/i686-apple-darwin-4.2.1/bin)/i686-apple-darwin11-
  37 else
  38 CROSS_COMPILE ?= $(abspath prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.6/bin)/x86_64-linux-
  39 endif
  40 else
  41 CROSS_COMPILE ?= $(abspath $(TARGET_TOOLS_PREFIX))
  42 endif
  43 endif
  44
  45 KBUILD_OUTPUT := $(abspath $(TARGET_OUT_INTERMEDIATES)/kernel)
  46 mk_kernel := + $(hide) $(MAKE) $(if $(filter darwin,$(HOST_OS)),-j$$(sysctl -n hw.ncpu) -l$$(($$(sysctl -n hw.ncpu)+2)),-j$$(nproc) -l$$(($$(nproc)+2))) \
  47         -C $(KERNEL_DIR) O=$(KBUILD_OUTPUT) ARCH=$(TARGET_ARCH) CROSS_COMPILE="$(abspath $(CC_WRAPPER)) $(CROSS_COMPILE)" $(if $(SHOW_COMMANDS),V=1) \
  48         YACC=$(abspath $(BISON)) LEX=$(abspath $(LEX)) \
  49         $(KERNEL_CLANG_CLAGS)
  50
  51 KERNEL_CONFIG_FILE := $(if $(wildcard $(TARGET_KERNEL_CONFIG)),$(TARGET_KERNEL_CONFIG),$(KERNEL_DIR)/$(KERNEL_CONFIG_DIR)/$(TARGET_KERNEL_CONFIG))
  52
  53 MOD_ENABLED := $(shell grep ^CONFIG_MODULES=y $(KERNEL_CONFIG_FILE))
  54 FIRMWARE_ENABLED := $(shell grep ^CONFIG_FIRMWARE_IN_KERNEL=y $(KERNEL_CONFIG_FILE))
  55
  56 # I understand Android build system discourage to use submake,
  57 # but I don't want to write a complex Android.mk to build kernel.
  58 # This is the simplest way I can think.
  59 KERNEL_DOTCONFIG_FILE := $(KBUILD_OUTPUT)/.config
  60 KERNEL_ARCH_CHANGED := $(if $(filter 0,$(shell grep -s ^$(if $(filter x86,$(TARGET_KERNEL_ARCH)),\#.)CONFIG_64BIT $(KERNEL_DOTCONFIG_FILE) | wc -l)),FORCE)
  61 $(KERNEL_DOTCONFIG_FILE): $(KERNEL_CONFIG_FILE) $(wildcard $(TARGET_KERNEL_DIFFCONFIG)) $(KERNEL_ARCH_CHANGED)
  62         $(hide) mkdir -p $(@D) && cat $(wildcard $^) > $@
  63         $(hide) ln -sf ../../../../../../external $(@D)
  64         $(mk_kernel) olddefconfig
  65
  66 BUILT_KERNEL_TARGET := $(KBUILD_OUTPUT)/arch/$(TARGET_ARCH)/boot/$(KERNEL_TARGET)
  67 $(BUILT_KERNEL_TARGET): $(KERNEL_DOTCONFIG_FILE)
  68         $(mk_kernel) $(KERNEL_TARGET) $(if $(MOD_ENABLED),modules)
  69         $(if $(FIRMWARE_ENABLED),$(mk_kernel) INSTALL_MOD_PATH=$(abspath $(TARGET_OUT)) firmware_install)
  70
  71 ifneq ($(MOD_ENABLED),)
  72 KERNEL_MODULES_DEP := $(firstword $(wildcard $(TARGET_OUT)/lib/modules/*/modules.dep))
  73 KERNEL_MODULES_DEP := $(if $(KERNEL_MODULES_DEP),$(KERNEL_MODULES_DEP),$(TARGET_OUT)/lib/modules)
  74
  75 ALL_EXTRA_MODULES := $(patsubst %,$(TARGET_OUT_INTERMEDIATES)/kmodule/%,$(TARGET_EXTRA_KERNEL_MODULES))
  76 $(ALL_EXTRA_MODULES): $(TARGET_OUT_INTERMEDIATES)/kmodule/%: $(BUILT_KERNEL_TARGET) | $(ACP)
  77         @echo Building additional kernel module $*
  78         $(hide) mkdir -p $(@D) && $(ACP) -fr $(EXTRA_KERNEL_MODULE_PATH_$*) $(@D)
  79         $(mk_kernel) M=$(abspath $@) modules || ( rm -rf $@ && exit 1 )
  80
  81 $(KERNEL_MODULES_DEP): $(BUILT_KERNEL_TARGET) $(ALL_EXTRA_MODULES)
  82         $(hide) rm -rf $(TARGET_OUT)/lib/modules
  83         $(mk_kernel) INSTALL_MOD_PATH=$(abspath $(TARGET_OUT)) modules_install
  84         + $(hide) for kmod in $(TARGET_EXTRA_KERNEL_MODULES) ; do \
  85                 echo Installing additional kernel module $${kmod} ; \
  86                 $(subst +,,$(subst $(hide),,$(mk_kernel))) INSTALL_MOD_PATH=$(abspath $(TARGET_OUT)) M=$(abspath $(TARGET_OUT_INTERMEDIATES))/kmodule/$${kmod} modules_install ; \
  87         done
  88         $(hide) rm -f $(TARGET_OUT)/lib/modules/*/{build,source}
  89 endif
  90
  91 $(BUILT_SYSTEMIMAGE): $(KERNEL_MODULES_DEP)
  92
  93 # rules to get source of Broadcom 802.11a/b/g/n hybrid device driver
  94 # based on broadcomsetup.sh of Kyle Evans
  95 WL_PATH := $(KERNEL_DIR)/drivers/net/wireless/broadcom/wl
  96 ifeq ($(wildcard $(WL_PATH)/build.mk),)
  97 WL_PATH := $(KERNEL_DIR)/drivers/net/wireless/wl
  98 endif
  99 -include $(WL_PATH)/build.mk
 100
 101 installclean: FILES += $(KBUILD_OUTPUT) $(INSTALLED_KERNEL_TARGET)
 102
 103 TARGET_PREBUILT_KERNEL := $(BUILT_KERNEL_TARGET)
 104
 105 .PHONY: kernel $(if $(KERNEL_ARCH_CHANGED),$(KERNEL_HEADERS_COMMON)/linux/binder.h)
 106 kernel: $(INSTALLED_KERNEL_TARGET)
 107
 108 endif # TARGET_PREBUILT_KERNEL
 109
 110 ifndef LINEAGE_BUILD
 111 $(INSTALLED_KERNEL_TARGET): $(TARGET_PREBUILT_KERNEL) | $(ACP)
 112         $(copy-file-to-new-target)
 113 ifdef TARGET_PREBUILT_MODULES
 114         mkdir -p $(TARGET_OUT)/lib
 115         $(hide) cp -r $(TARGET_PREBUILT_MODULES) $(TARGET_OUT)/lib
 116 endif
 117 endif # LINEAGE_BUILD
 118 endif # KBUILD_OUTPUT