core/tasks/kernel.mk

   1 #
   2 # Copyright (C) 2014-2016 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 CROSS_COMPILE ?= $(abspath $(TARGET_TOOLCHAIN_ROOT)/bin)/x86_64-linux-androidkernel-
  29 KBUILD_OUTPUT := $(abspath $(TARGET_OUT_INTERMEDIATES)/kernel)
  30 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)
  31
  32 KERNEL_CONFIG_FILE := $(if $(wildcard $(TARGET_KERNEL_CONFIG)),$(TARGET_KERNEL_CONFIG),$(KERNEL_DIR)/$(KERNEL_CONFIG_DIR)/$(TARGET_KERNEL_CONFIG))
  33
  34 MOD_ENABLED := $(shell grep ^CONFIG_MODULES=y $(KERNEL_CONFIG_FILE))
  35 FIRMWARE_ENABLED := $(shell grep ^CONFIG_FIRMWARE_IN_KERNEL=y $(KERNEL_CONFIG_FILE))
  36
  37 # I understand Android build system discourage to use submake,
  38 # but I don't want to write a complex Android.mk to build kernel.
  39 # This is the simplest way I can think.
  40 KERNEL_DOTCONFIG_FILE := $(KBUILD_OUTPUT)/.config
  41 KERNEL_ARCH_CHANGED := $(if $(filter 0,$(shell grep -s ^$(if $(filter x86,$(TARGET_KERNEL_ARCH)),\#.)CONFIG_64BIT $(KERNEL_DOTCONFIG_FILE) | wc -l)),FORCE)
  42 $(KERNEL_DOTCONFIG_FILE): $(KERNEL_CONFIG_FILE) $(wildcard $(TARGET_KERNEL_DIFFCONFIG)) $(KERNEL_ARCH_CHANGED)
  43         $(hide) mkdir -p $(@D) && cat $(wildcard $^) > $@
  44         $(mk_kernel) oldnoconfig
  45
  46 # bison is needed to build kernel and external modules from source
  47 BISON := $(HOST_OUT_EXECUTABLES)/bison$(HOST_EXECUTABLE_SUFFIX)
  48
  49 BUILT_KERNEL_TARGET := $(KBUILD_OUTPUT)/arch/$(TARGET_ARCH)/boot/$(KERNEL_TARGET)
  50 $(INSTALLED_KERNEL_TARGET): $(KERNEL_DOTCONFIG_FILE) | $(ACP) $(BISON)
  51         $(mk_kernel) $(KERNEL_TARGET) $(if $(MOD_ENABLED),modules)
  52         $(hide) $(ACP) -fp $(BUILT_KERNEL_TARGET) $@
  53         $(if $(FIRMWARE_ENABLED),$(mk_kernel) INSTALL_MOD_PATH=$(abspath $(TARGET_OUT)) firmware_install)
  54
  55 ifneq ($(MOD_ENABLED),)
  56 KERNEL_MODULES_DEP := $(firstword $(wildcard $(TARGET_OUT)/lib/modules/*/modules.dep))
  57 KERNEL_MODULES_DEP := $(if $(KERNEL_MODULES_DEP),$(KERNEL_MODULES_DEP),$(TARGET_OUT)/lib/modules)
  58
  59 ALL_EXTRA_MODULES := $(patsubst %,$(TARGET_OUT_INTERMEDIATES)/kmodule/%,$(TARGET_EXTRA_KERNEL_MODULES))
  60 $(ALL_EXTRA_MODULES): $(TARGET_OUT_INTERMEDIATES)/kmodule/%: $(INSTALLED_KERNEL_TARGET)
  61         @echo Building additional kernel module $*
  62         $(hide) mkdir -p $(@D) && $(ACP) -fr $(EXTRA_KERNEL_MODULE_PATH_$*) $(@D)
  63         $(mk_kernel) M=$(abspath $@) modules
  64
  65 $(KERNEL_MODULES_DEP): $(INSTALLED_KERNEL_TARGET) $(ALL_EXTRA_MODULES)
  66         $(hide) rm -rf $(TARGET_OUT)/lib/modules
  67         $(mk_kernel) INSTALL_MOD_PATH=$(abspath $(TARGET_OUT)) modules_install
  68         $(hide) for kmod in $(TARGET_EXTRA_KERNEL_MODULES) ; do \
  69                 echo Installing additional kernel module $${kmod} ; \
  70                 $(subst $(hide),,$(mk_kernel)) INSTALL_MOD_PATH=$(abspath $(TARGET_OUT)) M=$(abspath $(TARGET_OUT_INTERMEDIATES))/kmodule/$${kmod} modules_install ; \
  71         done
  72         $(hide) rm -f $(TARGET_OUT)/lib/modules/*/{build,source}
  73 endif
  74
  75 $(BUILT_SYSTEMIMAGE): $(KERNEL_MODULES_DEP)
  76
  77 # rules to get source of Broadcom 802.11a/b/g/n hybrid device driver
  78 # based on broadcomsetup.sh of Kyle Evans
  79 WL_PATH := $(KERNEL_DIR)/drivers/net/wireless/broadcom/wl
  80 ifeq ($(wildcard $(WL_PATH)/build.mk),)
  81 WL_PATH := $(KERNEL_DIR)/drivers/net/wireless/wl
  82 endif
  83 -include $(WL_PATH)/build.mk
  84
  85 installclean: FILES += $(KBUILD_OUTPUT) $(INSTALLED_KERNEL_TARGET)
  86
  87 TARGET_PREBUILT_KERNEL := $(INSTALLED_KERNEL_TARGET)
  88
  89 .PHONY: kernel $(if $(KERNEL_ARCH_CHANGED),$(KERNEL_HEADERS_COMMON)/linux/binder.h)
  90 kernel: $(TARGET_PREBUILT_KERNEL)
  91
  92 else
  93
  94 $(INSTALLED_KERNEL_TARGET): $(TARGET_PREBUILT_KERNEL) | $(ACP)
  95         $(copy-file-to-new-target)
  96 ifdef TARGET_PREBUILT_MODULES
  97         mkdir -p $(TARGET_OUT)/lib
  98         $(hide) cp -r $(TARGET_PREBUILT_MODULES) $(TARGET_OUT)/lib
  99 endif
 100
 101 endif # TARGET_PREBUILT_KERNEL
 102 endif # KBUILD_OUTPUT