1 #Android makefile to build kernel as a part of Android Build
4 KERNEL_TARGET := $(strip $(INSTALLED_KERNEL_TARGET))
5 ifeq ($(KERNEL_TARGET),)
6 INSTALLED_KERNEL_TARGET := $(PRODUCT_OUT)/kernel
9 TARGET_KERNEL_MAKE_ENV := $(strip $(TARGET_KERNEL_MAKE_ENV))
10 ifeq ($(TARGET_KERNEL_MAKE_ENV),)
13 KERNEL_MAKE_ENV := $(TARGET_KERNEL_MAKE_ENV)
16 TARGET_KERNEL_ARCH := $(strip $(TARGET_KERNEL_ARCH))
17 ifeq ($(TARGET_KERNEL_ARCH),)
20 KERNEL_ARCH := $(TARGET_KERNEL_ARCH)
23 TARGET_KERNEL_HEADER_ARCH := $(strip $(TARGET_KERNEL_HEADER_ARCH))
24 ifeq ($(TARGET_KERNEL_HEADER_ARCH),)
25 KERNEL_HEADER_ARCH := $(KERNEL_ARCH)
27 $(warning Forcing kernel header generation only for '$(TARGET_KERNEL_HEADER_ARCH)')
28 KERNEL_HEADER_ARCH := $(TARGET_KERNEL_HEADER_ARCH)
31 KERNEL_HEADER_DEFCONFIG := $(strip $(KERNEL_HEADER_DEFCONFIG))
32 ifeq ($(KERNEL_HEADER_DEFCONFIG),)
33 KERNEL_HEADER_DEFCONFIG := $(KERNEL_DEFCONFIG)
36 # Force 32-bit binder IPC for 64bit kernel with 32bit userspace
37 ifeq ($(KERNEL_ARCH),arm64)
38 ifeq ($(TARGET_ARCH),arm)
39 KERNEL_CONFIG_OVERRIDE := CONFIG_ANDROID_BINDER_IPC_32BIT=y
43 TARGET_KERNEL_CROSS_COMPILE_PREFIX := $(strip $(TARGET_KERNEL_CROSS_COMPILE_PREFIX))
44 ifeq ($(TARGET_KERNEL_CROSS_COMPILE_PREFIX),)
45 KERNEL_CROSS_COMPILE := arm-eabi-
47 KERNEL_CROSS_COMPILE := $(TARGET_KERNEL_CROSS_COMPILE_PREFIX)
50 ifeq ($(TARGET_PREBUILT_KERNEL),)
52 KERNEL_GCC_NOANDROID_CHK := $(shell (echo "int main() {return 0;}" | $(KERNEL_CROSS_COMPILE)gcc -E -mno-android - > /dev/null 2>&1 ; echo $$?))
53 ifeq ($(strip $(KERNEL_GCC_NOANDROID_CHK)),0)
54 KERNEL_CFLAGS := KCFLAGS=-mno-android
57 mkfile_path := $(abspath $(lastword $(MAKEFILE_LIST)))
58 current_dir := $(notdir $(patsubst %/,%,$(dir $(mkfile_path))))
59 ifeq ($(TARGET_KERNEL_VERSION),)
60 TARGET_KERNEL_VERSION := 3.18
62 TARGET_KERNEL := msm-$(TARGET_KERNEL_VERSION)
63 ifeq ($(TARGET_KERNEL),$(current_dir))
64 # New style, kernel/msm-version
65 BUILD_ROOT_LOC := ../../
66 TARGET_KERNEL_SOURCE := kernel/$(TARGET_KERNEL)
67 KERNEL_OUT := $(TARGET_OUT_INTERMEDIATES)/kernel/$(TARGET_KERNEL)
68 KERNEL_SYMLINK := $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ
69 KERNEL_USR := $(KERNEL_SYMLINK)/usr
71 # Legacy style, kernel source directly under kernel
72 KERNEL_LEGACY_DIR := true
74 TARGET_KERNEL_SOURCE := kernel
75 KERNEL_OUT := $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ
78 KERNEL_CONFIG := $(KERNEL_OUT)/.config
80 ifeq ($(KERNEL_DEFCONFIG)$(wildcard $(KERNEL_CONFIG)),)
81 $(error Kernel configuration not defined, cannot build kernel)
84 ifeq ($(TARGET_USES_UNCOMPRESSED_KERNEL),true)
85 $(info Using uncompressed kernel)
86 TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/Image
88 ifeq ($(KERNEL_ARCH),arm64)
89 TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/Image.gz
91 TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/zImage
95 ifeq ($(TARGET_KERNEL_APPEND_DTB), true)
96 $(info Using appended DTB)
97 TARGET_PREBUILT_INT_KERNEL := $(TARGET_PREBUILT_INT_KERNEL)-dtb
100 KERNEL_HEADERS_INSTALL := $(KERNEL_OUT)/usr
101 KERNEL_MODULES_INSTALL ?= system
102 KERNEL_MODULES_OUT ?= $(PRODUCT_OUT)/$(KERNEL_MODULES_INSTALL)/lib/modules
104 TARGET_PREBUILT_KERNEL := $(TARGET_PREBUILT_INT_KERNEL)
107 mdpath=`find $(KERNEL_MODULES_OUT) -type f -name modules.dep`;\
108 if [ "$$mdpath" != "" ];then\
109 mpath=`dirname $$mdpath`;\
110 ko=`find $$mpath/kernel -type f -name *.ko`;\
111 for i in $$ko; do mv $$i $(KERNEL_MODULES_OUT)/; done;\
115 define clean-module-folder
116 mdpath=`find $(KERNEL_MODULES_OUT) -type f -name modules.dep`;\
117 if [ "$$mdpath" != "" ];then\
118 mpath=`dirname $$mdpath`; rm -rf $$mpath;\
122 ifneq ($(KERNEL_LEGACY_DIR),true)
123 $(KERNEL_USR): $(KERNEL_HEADERS_INSTALL)
124 rm -rf $(KERNEL_SYMLINK)
125 ln -s kernel/$(TARGET_KERNEL) $(KERNEL_SYMLINK)
127 $(TARGET_PREBUILT_INT_KERNEL): $(KERNEL_USR)
131 mkdir -p $(KERNEL_OUT)
133 $(KERNEL_CONFIG): $(KERNEL_OUT)
134 $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(KERNEL_DEFCONFIG)
135 $(hide) if [ ! -z "$(KERNEL_CONFIG_OVERRIDE)" ]; then \
136 echo "Overriding kernel config with '$(KERNEL_CONFIG_OVERRIDE)'"; \
137 echo $(KERNEL_CONFIG_OVERRIDE) >> $(KERNEL_OUT)/.config; \
138 $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) oldconfig; fi
140 $(TARGET_PREBUILT_INT_KERNEL): $(KERNEL_OUT) $(KERNEL_HEADERS_INSTALL)
141 $(hide) echo "Building kernel..."
142 $(hide) rm -rf $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/dts
143 $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(KERNEL_CFLAGS)
144 $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(KERNEL_CFLAGS) modules
145 $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) INSTALL_MOD_PATH=$(BUILD_ROOT_LOC)../$(KERNEL_MODULES_INSTALL) INSTALL_MOD_STRIP=1 $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) modules_install
147 $(clean-module-folder)
149 $(KERNEL_HEADERS_INSTALL): $(KERNEL_OUT)
150 $(hide) if [ ! -z "$(KERNEL_HEADER_DEFCONFIG)" ]; then \
151 rm -f $(BUILD_ROOT_LOC)$(KERNEL_CONFIG); \
152 $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_HEADER_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(KERNEL_HEADER_DEFCONFIG); \
153 $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_HEADER_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) headers_install; fi
154 $(hide) if [ "$(KERNEL_HEADER_DEFCONFIG)" != "$(KERNEL_DEFCONFIG)" ]; then \
155 echo "Used a different defconfig for header generation"; \
156 rm -f $(BUILD_ROOT_LOC)$(KERNEL_CONFIG); \
157 $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(KERNEL_DEFCONFIG); fi
158 $(hide) if [ ! -z "$(KERNEL_CONFIG_OVERRIDE)" ]; then \
159 echo "Overriding kernel config with '$(KERNEL_CONFIG_OVERRIDE)'"; \
160 echo $(KERNEL_CONFIG_OVERRIDE) >> $(KERNEL_OUT)/.config; \
161 $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) oldconfig; fi
163 kerneltags: $(KERNEL_OUT) $(KERNEL_CONFIG)
164 $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) tags
166 kernelconfig: $(KERNEL_OUT) $(KERNEL_CONFIG)
167 env KCONFIG_NOTIMESTAMP=true \
168 $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) menuconfig
169 env KCONFIG_NOTIMESTAMP=true \
170 $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) savedefconfig
171 cp $(KERNEL_OUT)/defconfig $(TARGET_KERNEL_SOURCE)/arch/$(KERNEL_ARCH)/configs/$(KERNEL_DEFCONFIG)