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1ifeq ($(TARGET_KERNEL_BUILT_FROM_SOURCE),true)
2
3# Force using bash as a shell, otherwise, on Ubuntu, dash will break some
4# dependency due to its bad handling of echo \1
5MAKE += SHELL=/bin/bash
6
7ifeq ($(KERNEL_CFG_NAME),)
8$(error cannot build kernel, config not specified)
9endif
10
11ifeq ($(TARGET_KERNEL_ARCH),x86_64)
12KERNEL_TOOLCHAIN_ARCH := $(TARGET_KERNEL_ARCH)
13else
14KERNEL_TOOLCHAIN_ARCH := i686
15endif
16KERNEL_EXTRA_FLAGS := ANDROID_TOOLCHAIN_FLAGS="-mno-android -Werror"
17KERNEL_CROSS_COMP := $(notdir $(TARGET_TOOLS_PREFIX))
18
19KERNEL_CCACHE :=$(firstword $(TARGET_CC))
20KERNEL_PATH := $(ANDROID_BUILD_TOP)/vendor/intel/support
21ifeq ($(notdir $(KERNEL_CCACHE)),ccache)
22KERNEL_CROSS_COMP := "ccache $(KERNEL_CROSS_COMP)"
23KERNEL_PATH := $(KERNEL_PATH):$(ANDROID_BUILD_TOP)/$(dir $(KERNEL_CCACHE))
24endif
25
26#remove time_macros from ccache options, it breaks signing process
27KERNEL_CCSLOP := $(filter-out time_macros,$(subst $(comma), ,$(CCACHE_SLOPPINESS)))
28KERNEL_CCSLOP := $(subst $(space),$(comma),$(KERNEL_CCSLOP))
29
30KERNEL_OUT_DIR := $(PRODUCT_OUT)/linux/kernel
31KERNEL_CONFIG := $(KERNEL_OUT_DIR)/.config
32KERNEL_SAVE_DEFCONFIG := $(KERNEL_OUT_DIR)/defconfig
33KERNEL_BLD_FLAGS := \
34    ARCH=$(TARGET_KERNEL_ARCH) \
35    $(KERNEL_EXTRA_FLAGS)
36
37KERNEL_BLD_FLAGS :=$(KERNEL_BLD_FLAGS) \
38     O=../../$(KERNEL_OUT_DIR) \
39
40KERNEL_BLD_ENV := CROSS_COMPILE=$(KERNEL_CROSS_COMP) \
41    PATH=$(KERNEL_PATH):$(PATH) \
42    CCACHE_SLOPPINESS=$(KERNEL_CCSLOP)
43
44KERNEL_DEFCONFIG ?= $(KERNEL_SRC_DIR)/arch/x86/configs/$(KERNEL_CFG_NAME)_defconfig
45KERNEL_VERSION_FILE := $(KERNEL_OUT_DIR)/include/config/kernel.release
46KERNEL_BZIMAGE := $(PRODUCT_OUT)/kernel
47
48$(KERNEL_CONFIG): $(KERNEL_DEFCONFIG)
49	$(hide) echo Regenerating kernel config $(KERNEL_OUT_DIR)
50	$(hide) mkdir -p $(KERNEL_OUT_DIR)
51	$(hide) $(KERNEL_BLD_ENV) $(MAKE) -C $(KERNEL_SRC_DIR) $(KERNEL_BLD_FLAGS) $(notdir $(KERNEL_DEFCONFIG))
52
53ifeq (,$(filter build_kernel-nodeps,$(MAKECMDGOALS)))
54$(KERNEL_BZIMAGE): $(MINIGZIP)
55endif
56
57$(KERNEL_BZIMAGE): $(KERNEL_CONFIG)
58	$(hide) $(KERNEL_BLD_ENV) $(MAKE) -C $(KERNEL_SRC_DIR) $(KERNEL_BLD_FLAGS)
59	$(hide) cp -f $(KERNEL_OUT_DIR)/arch/x86/boot/bzImage $@
60
61clean_kernel:
62	$(hide) $(KERNEL_BLD_ENV) $(MAKE) -C $(KERNEL_SRC_DIR) $(KERNEL_BLD_FLAGS) clean
63
64menuconfig xconfig gconfig: $(KERNEL_CONFIG)
65	$(hide) $(KERNEL_BLD_ENV) $(MAKE) -C $(KERNEL_SRC_DIR) $(KERNEL_BLD_FLAGS) $@
66	$(hide) $(KERNEL_BLD_ENV) $(MAKE) -C $(KERNEL_SRC_DIR) $(KERNEL_BLD_FLAGS) savedefconfig
67	$(hide) cp -f $(KERNEL_SAVE_DEFCONFIG) $(KERNEL_DEFCONFIG)
68	$(hide) echo ===========
69	$(hide) echo $(KERNEL_DEFCONFIG) has been modified !
70	$(hide) echo ===========
71
72TAGS_files := TAGS
73tags_files := tags
74gtags_files := GTAGS GPATH GRTAGS GSYMS
75cscope_files := $(addprefix cscope.,files out out.in out.po)
76
77TAGS tags gtags cscope: $(KERNEL_CONFIG)
78	$(hide) $(KERNEL_BLD_ENV) $(MAKE) -C $(KERNEL_SRC_DIR) $(KERNEL_BLD_FLAGS) $@
79	$(hide) rm -f $(KERNEL_SRC_DIR)/$($@_files)
80	$(hide) cp -fs $(addprefix `pwd`/$(KERNEL_OUT_DIR)/,$($@_files)) $(KERNEL_SRC_DIR)/
81
82
83define build_kernel_module
84$(error Use of external Kernel modules is not allowed)
85endef
86
87.PHONY: menuconfig xconfig gconfig
88.PHONY: $(KERNEL_BZIMAGE)
89.PHONY: build_kernel build_kernel-nodeps
90
91$(PRODUCT_OUT)/boot.img: build_kernel
92
93endif #TARGET_KERNEL_BUILT_FROM_SOURCE
94