build/tasks/kernel.mk

   1 #
   2 # Copyright (C) 2014-2019 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 export LC_MESSAGES := C
  13
  14 ifneq ($(TARGET_NO_KERNEL),true)
  15 ifeq ($(TARGET_PREBUILT_KERNEL),)
  16
  17 KERNEL_DIR ?= kernel
  18
  19 ifneq ($(filter x86%,$(TARGET_ARCH)),)
  20 TARGET_KERNEL_ARCH ?= $(TARGET_ARCH)
  21 KERNEL_TARGET := bzImage
  22 TARGET_KERNEL_CONFIG ?= android-$(TARGET_KERNEL_ARCH)_defconfig
  23 KERNEL_CONFIG_DIR := arch/x86/configs
  24 endif
  25 ifeq ($(TARGET_ARCH),arm)
  26 KERNEL_TARGET := zImage
  27 TARGET_KERNEL_CONFIG ?= goldfish_defconfig
  28 KERNEL_CONFIG_DIR := arch/arm/configs
  29 endif
  30
  31 ifeq ($(BUILD_KERNEL_WITH_CLANG),true)
  32 CROSS_COMPILE := x86_64-linux-androidkernel-
  33 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):$$PATH
  34 else
  35 ifeq ($(TARGET_KERNEL_ARCH),x86_64)
  36 ifeq ($(HOST_OS),darwin)
  37 CROSS_COMPILE ?= $(abspath prebuilts/gcc/darwin-x86/host/i686-apple-darwin-4.2.1/bin)/i686-apple-darwin11-
  38 else
  39 CROSS_COMPILE ?= $(abspath prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.6/bin)/x86_64-linux-
  40 endif
  41 else
  42 CROSS_COMPILE ?= $(abspath $(TARGET_TOOLS_PREFIX))
  43 endif
  44 endif
  45
  46 KBUILD_OUTPUT := $(abspath $(TARGET_OUT_INTERMEDIATES)/kernel)
  47 mk_kernel := + $(hide) $(MAKE) $(if $(filter darwin,$(HOST_OS)),-j$$(sysctl -n hw.ncpu) -l$$(($$(sysctl -n hw.ncpu)+2)),-j$$(nproc) -l$$(($$(nproc)+2))) \
  48         -C $(KERNEL_DIR) O=$(KBUILD_OUTPUT) ARCH=$(TARGET_ARCH) CROSS_COMPILE="$(abspath $(CC_WRAPPER)) $(CROSS_COMPILE)" $(if $(SHOW_COMMANDS),V=1) \
  49         YACC=$(abspath $(BISON)) LEX=$(abspath $(LEX)) \
  50         $(KERNEL_CLANG_CLAGS)
  51
  52 KERNEL_CONFIG_FILE := $(if $(wildcard $(TARGET_KERNEL_CONFIG)),$(TARGET_KERNEL_CONFIG),$(KERNEL_DIR)/$(KERNEL_CONFIG_DIR)/$(TARGET_KERNEL_CONFIG))
  53
  54 MOD_ENABLED := $(shell grep ^CONFIG_MODULES=y $(KERNEL_CONFIG_FILE))
  55 FIRMWARE_ENABLED := $(shell grep ^CONFIG_FIRMWARE_IN_KERNEL=y $(KERNEL_CONFIG_FILE))
  56
  57 # I understand Android build system discourage to use submake,
  58 # but I don't want to write a complex Android.mk to build kernel.
  59 # This is the simplest way I can think.
  60 KERNEL_DOTCONFIG_FILE := $(KBUILD_OUTPUT)/.config
  61 KERNEL_ARCH_CHANGED := $(if $(filter 0,$(shell grep -s ^$(if $(filter x86,$(TARGET_KERNEL_ARCH)),\#.)CONFIG_64BIT $(KERNEL_DOTCONFIG_FILE) | wc -l)),FORCE)
  62 $(KERNEL_DOTCONFIG_FILE): $(KERNEL_CONFIG_FILE) $(wildcard $(TARGET_KERNEL_DIFFCONFIG)) $(KERNEL_ARCH_CHANGED)
  63         $(hide) mkdir -p $(@D) && cat $(wildcard $^) > $@
  64         $(hide) ln -sf ../../../../../../external $(@D)
  65         $(mk_kernel) olddefconfig
  66
  67 BUILT_KERNEL_TARGET := $(KBUILD_OUTPUT)/arch/$(TARGET_ARCH)/boot/$(KERNEL_TARGET)
  68 $(BUILT_KERNEL_TARGET): $(KERNEL_DOTCONFIG_FILE)
  69         $(mk_kernel) $(KERNEL_TARGET) $(if $(MOD_ENABLED),modules)
  70         $(if $(FIRMWARE_ENABLED),$(mk_kernel) INSTALL_MOD_PATH=$(abspath $(TARGET_OUT)) firmware_install)
  71
  72 ifneq ($(MOD_ENABLED),)
  73 KERNEL_MODULES_DEP := $(firstword $(wildcard $(TARGET_OUT)/lib/modules/*/modules.dep))
  74 KERNEL_MODULES_DEP := $(if $(KERNEL_MODULES_DEP),$(KERNEL_MODULES_DEP),$(TARGET_OUT)/lib/modules)
  75
  76 ALL_EXTRA_MODULES := $(patsubst %,$(TARGET_OUT_INTERMEDIATES)/kmodule/%,$(TARGET_EXTRA_KERNEL_MODULES))
  77 $(ALL_EXTRA_MODULES): $(TARGET_OUT_INTERMEDIATES)/kmodule/%: $(BUILT_KERNEL_TARGET) | $(ACP)
  78         @echo Building additional kernel module $*
  79         $(hide) mkdir -p $(@D) && $(ACP) -fr $(EXTRA_KERNEL_MODULE_PATH_$*) $(@D)
  80         $(mk_kernel) M=$(abspath $@) modules || ( rm -rf $@ && exit 1 )
  81
  82 $(KERNEL_MODULES_DEP): $(BUILT_KERNEL_TARGET) $(ALL_EXTRA_MODULES)
  83         $(hide) rm -rf $(TARGET_OUT)/lib/modules
  84         $(mk_kernel) INSTALL_MOD_PATH=$(abspath $(TARGET_OUT)) modules_install
  85         + $(hide) for kmod in $(TARGET_EXTRA_KERNEL_MODULES) ; do \
  86                 echo Installing additional kernel module $${kmod} ; \
  87                 $(subst +,,$(subst $(hide),,$(mk_kernel))) INSTALL_MOD_PATH=$(abspath $(TARGET_OUT)) M=$(abspath $(TARGET_OUT_INTERMEDIATES))/kmodule/$${kmod} modules_install ; \
  88         done
  89         $(hide) rm -f $(TARGET_OUT)/lib/modules/*/{build,source}
  90 endif
  91
  92 $(BUILT_SYSTEMIMAGE): $(KERNEL_MODULES_DEP)
  93
  94 # rules to get source of Broadcom 802.11a/b/g/n hybrid device driver
  95 # based on broadcomsetup.sh of Kyle Evans
  96 WL_PATH := $(KERNEL_DIR)/drivers/net/wireless/broadcom/wl
  97 ifeq ($(wildcard $(WL_PATH)/build.mk),)
  98 WL_PATH := $(KERNEL_DIR)/drivers/net/wireless/wl
  99 endif
 100 -include $(WL_PATH)/build.mk
 101
 102 installclean: FILES += $(KBUILD_OUTPUT) $(INSTALLED_KERNEL_TARGET)
 103
 104 TARGET_PREBUILT_KERNEL := $(BUILT_KERNEL_TARGET)
 105
 106 .PHONY: kernel $(if $(KERNEL_ARCH_CHANGED),$(KERNEL_HEADERS_COMMON)/linux/binder.h)
 107 kernel: $(INSTALLED_KERNEL_TARGET)
 108
 109 endif # TARGET_PREBUILT_KERNEL
 110
 111 ifndef LINEAGE_BUILD
 112 $(INSTALLED_KERNEL_TARGET): $(TARGET_PREBUILT_KERNEL) | $(ACP)
 113         $(copy-file-to-new-target)
 114 ifdef TARGET_PREBUILT_MODULES
 115         mkdir -p $(TARGET_OUT)/lib
 116         $(hide) cp -r $(TARGET_PREBUILT_MODULES) $(TARGET_OUT)/lib
 117 endif
 118 endif # LINEAGE_BUILD
 119 endif # KBUILD_OUTPUT