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 ifeq ($(KBUILD_OUTPUT),)
  12 ifeq ($(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 KBUILD_OUTPUT := $(abspath $(TARGET_OUT_INTERMEDIATES)/kernel)
  29 mk_kernel := + $(hide) $(MAKE) -C $(KERNEL_DIR) O=$(KBUILD_OUTPUT) ARCH=$(TARGET_ARCH) CROSS_COMPILE=$(abspath $(TARGET_TOOLS_PREFIX)) $(if $(SHOW_COMMANDS),V=1)
  30
  31 KERNEL_CONFIG_FILE := $(if $(wildcard $(TARGET_KERNEL_CONFIG)),$(TARGET_KERNEL_CONFIG),$(KERNEL_DIR)/$(KERNEL_CONFIG_DIR)/$(TARGET_KERNEL_CONFIG))
  32
  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_ARCH_CHANGED := $(if $(filter 0,$(shell grep -s ^$(if $(filter x86,$(TARGET_KERNEL_ARCH)),\#.)CONFIG_64BIT $(KERNEL_DOTCONFIG_FILE) | wc -l)),FORCE)
  41 $(KERNEL_DOTCONFIG_FILE): $(KERNEL_CONFIG_FILE) $(wildcard $(TARGET_KERNEL_DIFFCONFIG)) $(KERNEL_ARCH_CHANGED)
  42         $(hide) mkdir -p $(@D) && cat $(wildcard $^) > $@
  43         $(mk_kernel) oldnoconfig
  44
  45 # bison is needed to build kernel and external modules from source
  46 BISON := $(HOST_OUT_EXECUTABLES)/bison$(HOST_EXECUTABLE_SUFFIX)
  47
  48 BUILT_KERNEL_TARGET := $(KBUILD_OUTPUT)/arch/$(TARGET_ARCH)/boot/$(KERNEL_TARGET)
  49 $(INSTALLED_KERNEL_TARGET): $(KERNEL_DOTCONFIG_FILE) | $(ACP) $(BISON)
  50         $(mk_kernel) $(KERNEL_TARGET) $(if $(MOD_ENABLED),modules)
  51         $(hide) $(ACP) -fp $(BUILT_KERNEL_TARGET) $@
  52         $(if $(FIRMWARE_ENABLED),$(mk_kernel) INSTALL_MOD_PATH=$(abspath $(TARGET_OUT)) firmware_install)
  53
  54 ifneq ($(MOD_ENABLED),)
  55 KERNEL_MODULES_DEP := $(firstword $(wildcard $(TARGET_OUT)/lib/modules/*/modules.dep))
  56 KERNEL_MODULES_DEP := $(if $(KERNEL_MODULES_DEP),$(KERNEL_MODULES_DEP),$(TARGET_OUT)/lib/modules)
  57
  58 $(TARGET_OUT_INTERMEDIATES)/%.kmodule: $(INSTALLED_KERNEL_TARGET)
  59         $(hide) cp -an $(EXTRA_KERNEL_MODULE_PATH_$*) $(TARGET_OUT_INTERMEDIATES)/$*.kmodule
  60         @echo Building additional kernel module $*
  61         $(mk_kernel) M=$(abspath $@) modules
  62
  63 $(KERNEL_MODULES_DEP): $(INSTALLED_KERNEL_TARGET) $(patsubst %,$(TARGET_OUT_INTERMEDIATES)/%.kmodule,$(TARGET_EXTRA_KERNEL_MODULES))
  64         $(hide) rm -rf $(TARGET_OUT)/lib/modules
  65         $(mk_kernel) INSTALL_MOD_PATH=$(abspath $(TARGET_OUT)) modules_install
  66         + $(hide) for kmod in $(TARGET_EXTRA_KERNEL_MODULES) ; do \
  67                 echo Installing additional kernel module $${kmod} ; \
  68                 $(subst +,,$(subst $(hide),,$(mk_kernel))) INSTALL_MOD_PATH=$(abspath $(TARGET_OUT)) M=$(abspath $(TARGET_OUT_INTERMEDIATES))/$${kmod}.kmodule modules_install ; \
  69         done
  70         $(hide) rm -f $(TARGET_OUT)/lib/modules/*/{build,source}
  71 endif
  72
  73 $(BUILT_SYSTEMIMAGE): $(KERNEL_MODULES_DEP)
  74
  75 # rules to get source of Broadcom 802.11a/b/g/n hybrid device driver
  76 # based on broadcomsetup.sh of Kyle Evans
  77 WL_PATH := $(KERNEL_DIR)/drivers/net/wireless/wl
  78 WL_ENABLED := $(if $(wildcard $(WL_PATH)),$(shell grep ^CONFIG_WL=[my] $(KERNEL_CONFIG_FILE)))
  79 WL_ARCH_CHANGED := $(if $(shell file $(WL_PATH)/lib/wlc_hybrid.o_shipped | grep -s $(if $(filter x86,$(TARGET_KERNEL_ARCH)),80386,x86-64)),,FORCE)
  80 WL_SRC := $(WL_PATH)/hybrid-v35$(if $(filter x86,$(TARGET_KERNEL_ARCH)),,_64)-nodebug-pcoem-6_30_223_271.tar.gz
  81 $(WL_SRC):
  82         @echo Downloading $(@F)...
  83         $(hide) curl http://www.broadcom.com/docs/linux_sta/$(@F) > $@
  84 $(WL_PATH)/Makefile : $(WL_SRC) $(wildcard $(WL_PATH)/*.patch) $(WL_ARCH_CHANGED) $(KERNEL_ARCH_CHANGED)
  85         $(hide) tar zxf $< -C $(@D) --overwrite && \
  86                 patch -p5 -d $(@D) -i wl.patch && \
  87                 patch -p1 -d $(@D) -i linux-recent.patch
  88 $(INSTALLED_KERNEL_TARGET): $(if $(WL_ENABLED),$(WL_PATH)/Makefile)
  89
  90 installclean: FILES += $(KBUILD_OUTPUT) $(INSTALLED_KERNEL_TARGET)
  91
  92 TARGET_PREBUILT_KERNEL := $(INSTALLED_KERNEL_TARGET)
  93
  94 .PHONY: kernel $(if $(KERNEL_ARCH_CHANGED),$(KERNEL_HEADERS_COMMON)/linux/binder.h)
  95 kernel: $(TARGET_PREBUILT_KERNEL)
  96
  97 else
  98
  99 $(INSTALLED_KERNEL_TARGET): $(TARGET_PREBUILT_KERNEL) | $(ACP)
 100         $(copy-file-to-new-target)
 101 ifdef TARGET_PREBUILT_MODULES
 102         mkdir -p $(TARGET_OUT)/lib
 103         $(hide) cp -r $(TARGET_PREBUILT_MODULES) $(TARGET_OUT)/lib
 104 endif
 105
 106 endif # TARGET_PREBUILT_KERNEL
 107 endif # KBUILD_OUTPUT