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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
48HOST_OPENSSL := $(HOST_OUT_EXECUTABLES)/openssl
49
50$(KERNEL_CONFIG): $(KERNEL_DEFCONFIG)
51	$(hide) echo Regenerating kernel config $(KERNEL_OUT_DIR)
52	$(hide) mkdir -p $(KERNEL_OUT_DIR)
53	$(hide) $(KERNEL_BLD_ENV) $(MAKE) -C $(KERNEL_SRC_DIR) $(KERNEL_BLD_FLAGS) $(notdir $(KERNEL_DEFCONFIG))
54
55ifeq (,$(filter build_kernel-nodeps,$(MAKECMDGOALS)))
56$(KERNEL_BZIMAGE): $(HOST_OPENSSL) $(MINIGZIP)
57endif
58
59$(KERNEL_BZIMAGE): $(KERNEL_CONFIG)
60	$(hide) $(KERNEL_BLD_ENV) $(MAKE) -C $(KERNEL_SRC_DIR) $(KERNEL_BLD_FLAGS)
61	$(hide) cp -f $(KERNEL_OUT_DIR)/arch/x86/boot/bzImage $@
62
63clean_kernel:
64	$(hide) $(KERNEL_BLD_ENV) $(MAKE) -C $(KERNEL_SRC_DIR) $(KERNEL_BLD_FLAGS) clean
65
66menuconfig xconfig gconfig: $(KERNEL_CONFIG)
67	$(hide) $(KERNEL_BLD_ENV) $(MAKE) -C $(KERNEL_SRC_DIR) $(KERNEL_BLD_FLAGS) $@
68	$(hide) $(KERNEL_BLD_ENV) $(MAKE) -C $(KERNEL_SRC_DIR) $(KERNEL_BLD_FLAGS) savedefconfig
69	$(hide) cp -f $(KERNEL_SAVE_DEFCONFIG) $(KERNEL_DEFCONFIG)
70	$(hide) echo ===========
71	$(hide) echo $(KERNEL_DEFCONFIG) has been modified !
72	$(hide) echo ===========
73
74TAGS_files := TAGS
75tags_files := tags
76gtags_files := GTAGS GPATH GRTAGS GSYMS
77cscope_files := $(addprefix cscope.,files out out.in out.po)
78
79TAGS tags gtags cscope: $(KERNEL_CONFIG)
80	$(hide) $(KERNEL_BLD_ENV) $(MAKE) -C $(KERNEL_SRC_DIR) $(KERNEL_BLD_FLAGS) $@
81	$(hide) rm -f $(KERNEL_SRC_DIR)/$($@_files)
82	$(hide) cp -fs $(addprefix `pwd`/$(KERNEL_OUT_DIR)/,$($@_files)) $(KERNEL_SRC_DIR)/
83
84
85define build_kernel_module
86$(error Use of external Kernel modules is not allowed)
87endef
88
89.PHONY: menuconfig xconfig gconfig
90.PHONY: $(KERNEL_BZIMAGE)
91.PHONY: build_kernel build_kernel-nodeps
92
93$(PRODUCT_OUT)/boot.img: build_kernel
94
95endif #TARGET_KERNEL_BUILT_FROM_SOURCE
96