core/kernel.mk

   1 #
   2 # Copyright (C) 2009 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 ifeq ($(TARGET_PREBUILT_KERNEL),)
  12
  13 ifeq ($(TARGET_ARCH),x86)
  14 KERNEL_TARGET := bzImage
  15 TARGET_KERNEL_CONFIG ?= android-x86_defconfig
  16 endif
  17 ifeq ($(TARGET_ARCH),arm)
  18 KERNEL_TARGET := zImage
  19 TARGET_KERNEL_CONFIG ?= goldfish_defconfig
  20 endif
  21
  22 KBUILD_OUTPUT := $(CURDIR)/$(TARGET_OUT_INTERMEDIATES)/kernel
  23 mk_kernel := + $(hide) $(MAKE) -C kernel O=$(KBUILD_OUTPUT) ARCH=$(TARGET_ARCH) $(if $(SHOW_COMMANDS),V=1)
  24 ifneq ($(TARGET_ARCH),$(HOST_ARCH))
  25 mk_kernel += CROSS_COMPILE=$(CURDIR)/$(TARGET_TOOLS_PREFIX)
  26 endif
  27
  28 ifneq ($(wildcard $(TARGET_KERNEL_CONFIG)),)
  29 KERNEL_CONFIG_FILE := $(TARGET_KERNEL_CONFIG)
  30 else
  31 KERNEL_CONFIG_FILE := kernel/arch/$(TARGET_ARCH)/configs/$(TARGET_KERNEL_CONFIG)
  32 endif
  33 MOD_ENABLED := $(shell grep ^CONFIG_MODULES=y $(KERNEL_CONFIG_FILE))
  34 FIRMWARE_ENABLED := $(shell grep ^CONFIG_FIRMWARE_IN_KERNEL=y $(KERNEL_CONFIG_FILE))
  35
  36 # I understand Android build system discourage to use submake,
  37 # but I don't want to write a complex Android.mk to build kernel.
  38 # This is the simplest way I can think.
  39 KERNEL_DOTCONFIG_FILE := $(KBUILD_OUTPUT)/.config
  40 $(KERNEL_DOTCONFIG_FILE): $(KERNEL_CONFIG_FILE) | $(ACP)
  41         $(copy-file-to-new-target)
  42
  43 BUILT_KERNEL_TARGET := $(KBUILD_OUTPUT)/arch/$(TARGET_ARCH)/boot/$(KERNEL_TARGET)
  44 $(INSTALLED_KERNEL_TARGET): $(KERNEL_DOTCONFIG_FILE)
  45         $(mk_kernel) loose_nonint_oldconfig
  46         $(mk_kernel) $(KERNEL_TARGET) $(if $(MOD_ENABLED),modules)
  47         $(hide) $(ACP) -fp $(BUILT_KERNEL_TARGET) $@
  48 ifdef TARGET_PREBUILT_MODULES
  49         $(hide) $(ACP) -r $(TARGET_PREBUILT_MODULES) $(TARGET_OUT)/lib
  50 else
  51         $(hide) rm -rf $(TARGET_OUT)/lib/modules
  52         $(if $(MOD_ENABLED),$(mk_kernel) INSTALL_MOD_PATH=$(CURDIR)/$(TARGET_OUT) modules_install)
  53         $(hide) rm -f $(TARGET_OUT)/lib/modules/*/{build,source}
  54 endif
  55         $(if $(FIRMWARE_ENABLED),$(mk_kernel) INSTALL_MOD_PATH=$(CURDIR)/$(TARGET_OUT) firmware_install)
  56
  57 installclean: FILES += $(KBUILD_OUTPUT) $(INSTALLED_KERNEL_TARGET)
  58
  59 TARGET_PREBUILT_KERNEL  := $(INSTALLED_KERNEL_TARGET)
  60
  61 .PHONY: kernel
  62 kernel: $(TARGET_PREBUILT_KERNEL)
  63
  64 else
  65
  66 $(INSTALLED_KERNEL_TARGET): $(TARGET_PREBUILT_KERNEL) | $(ACP)
  67         $(copy-file-to-new-target)
  68
  69 endif # TARGET_PREBUILT_KERNEL