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