core/kernel.mk

   1 ifeq ($(TARGET_PREBUILT_KERNEL),)
   2
   3 ifeq ($(TARGET_ARCH),x86)
   4 KERNEL_TARGET := bzImage
   5 TARGET_KERNEL_CONFIG ?= android-x86_defconfig
   6 endif
   7 ifeq ($(TARGET_ARCH),arm)
   8 KERNEL_TARGET := zImage
   9 TARGET_KERNEL_CONFIG ?= goldfish_defconfig
  10 endif
  11
  12 KBUILD_OUTPUT := $(CURDIR)/$(TARGET_OUT_INTERMEDIATES)/kernel
  13 $(KBUILD_OUTPUT):
  14         mkdir -p $(KBUILD_OUTPUT)
  15
  16 mk_kernel := + $(hide) $(MAKE) -C kernel O=$(KBUILD_OUTPUT) ARCH=$(TARGET_ARCH) $(if $(SHOW_COMMANDS),V=1)
  17 ifneq ($(TARGET_ARCH),$(HOST_ARCH))
  18 mk_kernel += CROSS_COMPILE=$(CURDIR)/$(TARGET_TOOLS_PREFIX)
  19 endif
  20
  21 KERNEL_CONFIG_FILE := kernel/arch/$(TARGET_ARCH)/configs/$(TARGET_KERNEL_CONFIG)
  22 MOD_ENABLED := $(shell grep ^CONFIG_MODULES=y $(KERNEL_CONFIG_FILE))
  23
  24 # I understand Android build system discourage to use submake,
  25 # but I don't want to write a complex Android.mk to build kernel.
  26 # This is the simplest way I can think.
  27 BUILT_KERNEL_TARGET := $(KBUILD_OUTPUT)/arch/$(TARGET_ARCH)/boot/$(KERNEL_TARGET)
  28 $(BUILT_KERNEL_TARGET): $(KERNEL_CONFIG_FILE) | $(KBUILD_OUTPUT)
  29         $(mk_kernel) $(TARGET_KERNEL_CONFIG)
  30         $(mk_kernel) $(KERNEL_TARGET) $(if $(MOD_ENABLED),modules)
  31
  32 $(INSTALLED_KERNEL_TARGET): $(BUILT_KERNEL_TARGET) | $(ACP)
  33         $(copy-file-to-new-target)
  34 ifdef TARGET_PREBUILT_MODULES
  35         $(ACP) -r $(TARGET_PREBUILT_MODULES) $(TARGET_OUT)/lib
  36 else
  37 ifneq ($(MOD_ENABLED),)
  38         $(mk_kernel) INSTALL_MOD_PATH=$(CURDIR)/$(TARGET_OUT) modules_install
  39         $(hide) rm -f $(TARGET_OUT)/lib/modules/*/{build,source}
  40 endif
  41 endif
  42
  43 installclean: FILES += $(KBUILD_OUTPUT) $(INSTALLED_KERNEL_TARGET)
  44
  45 TARGET_PREBUILT_KERNEL  := $(INSTALLED_KERNEL_TARGET)
  46
  47 .PHONY: kernel
  48 kernel: $(TARGET_PREBUILT_KERNEL)
  49
  50 endif