Android.mk

   1 #
   2 # Copyright (C) 2009-2011 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 KERNEL_DIR ?= $(call my-dir)
  14
  15 ifeq ($(TARGET_ARCH),x86)
  16 KERNEL_TARGET := bzImage
  17 TARGET_KERNEL_CONFIG ?= android-x86_defconfig
  18 endif
  19 ifeq ($(TARGET_ARCH),arm)
  20 KERNEL_TARGET := zImage
  21 TARGET_KERNEL_CONFIG ?= goldfish_defconfig
  22 endif
  23
  24 KBUILD_OUTPUT := $(CURDIR)/$(TARGET_OUT_INTERMEDIATES)/kernel
  25 mk_kernel := + $(hide) $(MAKE) -C $(KERNEL_DIR) O=$(KBUILD_OUTPUT) ARCH=$(TARGET_ARCH) $(if $(SHOW_COMMANDS),V=1)
  26 ifneq ($(TARGET_ARCH),$(HOST_ARCH))
  27 mk_kernel += CROSS_COMPILE=$(CURDIR)/$(TARGET_TOOLS_PREFIX)
  28 endif
  29
  30 KERNEL_CONFIG_FILE := $(if $(wildcard $(TARGET_KERNEL_CONFIG)),$(TARGET_KERNEL_CONFIG),$(KERNEL_DIR)/arch/$(TARGET_ARCH)/configs/$(TARGET_KERNEL_CONFIG))
  31
  32 MOD_ENABLED := $(shell grep ^CONFIG_MODULES=y $(KERNEL_CONFIG_FILE))
  33 FIRMWARE_ENABLED := $(shell grep ^CONFIG_FIRMWARE_IN_KERNEL=y $(KERNEL_CONFIG_FILE))
  34
  35 # I understand Android build system discourage to use submake,
  36 # but I don't want to write a complex Android.mk to build kernel.
  37 # This is the simplest way I can think.
  38 KERNEL_DOTCONFIG_FILE := $(KBUILD_OUTPUT)/.config
  39 $(KERNEL_DOTCONFIG_FILE): $(KERNEL_CONFIG_FILE) | $(ACP)
  40         $(copy-file-to-new-target)
  41
  42 BUILT_KERNEL_TARGET := $(KBUILD_OUTPUT)/arch/$(TARGET_ARCH)/boot/$(KERNEL_TARGET)
  43 $(INSTALLED_KERNEL_TARGET): $(KERNEL_DOTCONFIG_FILE)
  44         $(mk_kernel) oldnoconfig
  45         $(mk_kernel) $(KERNEL_TARGET) $(if $(MOD_ENABLED),modules)
  46         $(hide) $(ACP) -fp $(BUILT_KERNEL_TARGET) $@
  47         $(if $(FIRMWARE_ENABLED),$(mk_kernel) INSTALL_MOD_PATH=$(CURDIR)/$(TARGET_OUT) firmware_install)
  48
  49 ifneq ($(MOD_ENABLED),)
  50 ifeq ($(wildcard $(INSTALLED_KERNEL_TARGET)),)
  51 KERNEL_MODULES_DEP := $(TARGET_OUT)/lib/modules
  52 else
  53 KERNELRELEASE := $(shell $(MAKE) -sC $(KERNEL_DIR) O=$(KBUILD_OUTPUT) ARCH=$(TARGET_ARCH) kernelrelease)
  54 KERNEL_MODULES_DEP := $(TARGET_OUT)/lib/modules/$(KERNELRELEASE)/modules.dep
  55 endif
  56 $(TARGET_OUT_INTERMEDIATES)/%.kmodule: $(INSTALLED_KERNEL_TARGET)
  57         $(hide) cp -an $(EXTRA_KERNEL_MODULE_PATH_$*) $(TARGET_OUT_INTERMEDIATES)/$*.kmodule
  58         @echo Building additional kernel module $*
  59         $(mk_kernel) M=$(CURDIR)/$@ modules
  60
  61 $(KERNEL_MODULES_DEP): $(INSTALLED_KERNEL_TARGET) $(patsubst %,$(TARGET_OUT_INTERMEDIATES)/%.kmodule,$(TARGET_EXTRA_KERNEL_MODULES))
  62         $(hide) rm -rf $(TARGET_OUT)/lib/modules
  63         $(mk_kernel) INSTALL_MOD_PATH=$(CURDIR)/$(TARGET_OUT) modules_install
  64         + $(hide) for kmod in $(TARGET_EXTRA_KERNEL_MODULES) ; do \
  65                 echo Installing additional kernel module $${kmod} ; \
  66                 $(subst +,,$(subst $(hide),,$(mk_kernel))) INSTALL_MOD_PATH=$(CURDIR)/$(TARGET_OUT) M=$(CURDIR)/$(TARGET_OUT_INTERMEDIATES)/$${kmod}.kmodule modules_install ; \
  67         done
  68         $(hide) rm -f $(TARGET_OUT)/lib/modules/*/{build,source}
  69 endif
  70
  71 # rules to get source of Broadcom 802.11a/b/g/n hybrid device driver
  72 # based on broadcomsetup.sh of Kyle Evans
  73 WL_ENABLED := $(shell grep ^CONFIG_WL=[my] $(KERNEL_DOTCONFIG_FILE))
  74 WL_PATH := drivers/net/wireless/wl
  75 WL_SRC := $(KERNEL_DIR)/$(WL_PATH)/hybrid-portsrc_x86_32-v5_100_82_112.tar.gz
  76 $(WL_SRC):
  77         @echo Downloading $(@F)...
  78         $(hide) curl http://www.broadcom.com/docs/linux_sta/$(@F) > $@ && tar zxf $@ -C $(@D) --overwrite && \
  79         (cd kernel/$(WL_PATH); patch Makefile < Makefile.patch; patch src/wl/sys/wl_iw.h < wl_iw.h.patch)
  80 $(INSTALLED_KERNEL_TARGET): $(if $(WL_ENABLED),$(WL_SRC))
  81
  82 installclean: FILES += $(KBUILD_OUTPUT) $(INSTALLED_KERNEL_TARGET)
  83
  84 TARGET_PREBUILT_KERNEL := $(INSTALLED_KERNEL_TARGET)
  85
  86 .PHONY: kernel
  87 kernel: $(TARGET_PREBUILT_KERNEL)
  88
  89 else
  90
  91 $(INSTALLED_KERNEL_TARGET): $(TARGET_PREBUILT_KERNEL) | $(ACP)
  92         $(copy-file-to-new-target)
  93 ifdef TARGET_PREBUILT_MODULES
  94         mkdir -p $(TARGET_OUT)/lib
  95         $(hide) cp -r $(TARGET_PREBUILT_MODULES) $(TARGET_OUT)/lib
  96 endif
  97
  98 endif # TARGET_PREBUILT_KERNEL