AndroidKernel.mk

   1 #Android makefile to build kernel as a part of Android Build
   2 PERL            = perl
   3
   4 KERNEL_TARGET := $(strip $(INSTALLED_KERNEL_TARGET))
   5 ifeq ($(KERNEL_TARGET),)
   6 INSTALLED_KERNEL_TARGET := $(PRODUCT_OUT)/kernel
   7 endif
   8
   9 TARGET_KERNEL_MAKE_ENV := $(strip $(TARGET_KERNEL_MAKE_ENV))
  10 ifeq ($(TARGET_KERNEL_MAKE_ENV),)
  11 KERNEL_MAKE_ENV :=
  12 else
  13 KERNEL_MAKE_ENV := $(TARGET_KERNEL_MAKE_ENV)
  14 endif
  15
  16 TARGET_KERNEL_ARCH := $(strip $(TARGET_KERNEL_ARCH))
  17 ifeq ($(TARGET_KERNEL_ARCH),)
  18 KERNEL_ARCH := arm
  19 else
  20 KERNEL_ARCH := $(TARGET_KERNEL_ARCH)
  21 endif
  22
  23 TARGET_KERNEL_HEADER_ARCH := $(strip $(TARGET_KERNEL_HEADER_ARCH))
  24 ifeq ($(TARGET_KERNEL_HEADER_ARCH),)
  25 KERNEL_HEADER_ARCH := $(KERNEL_ARCH)
  26 else
  27 $(warning Forcing kernel header generation only for '$(TARGET_KERNEL_HEADER_ARCH)')
  28 KERNEL_HEADER_ARCH := $(TARGET_KERNEL_HEADER_ARCH)
  29 endif
  30
  31 KERNEL_HEADER_DEFCONFIG := $(strip $(KERNEL_HEADER_DEFCONFIG))
  32 ifeq ($(KERNEL_HEADER_DEFCONFIG),)
  33 KERNEL_HEADER_DEFCONFIG := $(KERNEL_DEFCONFIG)
  34 endif
  35
  36 # Force 32-bit binder IPC for 64bit kernel with 32bit userspace
  37 ifeq ($(KERNEL_ARCH),arm64)
  38 ifeq ($(TARGET_ARCH),arm)
  39 KERNEL_CONFIG_OVERRIDE := CONFIG_ANDROID_BINDER_IPC_32BIT=y
  40 endif
  41 endif
  42
  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-
  46 else
  47 KERNEL_CROSS_COMPILE := $(shell pwd)/$(TARGET_TOOLS_PREFIX)
  48 endif
  49
  50 ifeq ($(TARGET_PREBUILT_KERNEL),)
  51
  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
  55 endif
  56
  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
  61 endif
  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
  70 else
  71     # Legacy style, kernel source directly under kernel
  72     KERNEL_LEGACY_DIR := true
  73     BUILD_ROOT_LOC := ../
  74     TARGET_KERNEL_SOURCE := kernel
  75     KERNEL_OUT := $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ
  76 endif
  77
  78 KERNEL_CONFIG := $(KERNEL_OUT)/.config
  79
  80 ifeq ($(KERNEL_DEFCONFIG)$(wildcard $(KERNEL_CONFIG)),)
  81 $(error Kernel configuration not defined, cannot build kernel)
  82 else
  83
  84 ifeq ($(TARGET_USES_UNCOMPRESSED_KERNEL),true)
  85 $(info Using uncompressed kernel)
  86 TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/Image
  87 else
  88 ifeq ($(KERNEL_ARCH),arm64)
  89 TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/Image.gz
  90 else
  91 TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/zImage
  92 endif
  93 endif
  94
  95 ifeq ($(TARGET_KERNEL_APPEND_DTB), true)
  96 $(info Using appended DTB)
  97 TARGET_PREBUILT_INT_KERNEL := $(TARGET_PREBUILT_INT_KERNEL)-dtb
  98 else
  99 $(info Using DTB Image)
 100 INSTALLED_DTBIMAGE_TARGET := $(PRODUCT_OUT)/dtb.img
 101 endif
 102
 103 # Creating a dtb.img once the kernel is compiled if TARGET_KERNEL_APPEND_DTB is set to be false
 104 $(INSTALLED_DTBIMAGE_TARGET): $(INSTALLED_KERNEL_TARGET)
 105         cat $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/dts/qcom/*.dtb > $@
 106
 107 KERNEL_HEADERS_INSTALL := $(KERNEL_OUT)/usr
 108 KERNEL_MODULES_INSTALL ?= system
 109 KERNEL_MODULES_OUT ?= $(PRODUCT_OUT)/$(KERNEL_MODULES_INSTALL)/lib/modules
 110
 111 TARGET_PREBUILT_KERNEL := $(TARGET_PREBUILT_INT_KERNEL)
 112
 113 define mv-modules
 114 mdpath=`find $(KERNEL_MODULES_OUT) -type f -name modules.dep`;\
 115 if [ "$$mdpath" != "" ];then\
 116 mpath=`dirname $$mdpath`;\
 117 ko=`find $$mpath/kernel -type f -name *.ko`;\
 118 for i in $$ko; do mv $$i $(KERNEL_MODULES_OUT)/; done;\
 119 fi
 120 endef
 121
 122 define clean-module-folder
 123 mdpath=`find $(KERNEL_MODULES_OUT) -type f -name modules.dep`;\
 124 if [ "$$mdpath" != "" ];then\
 125 mpath=`dirname $$mdpath`; rm -rf $$mpath;\
 126 fi
 127 endef
 128
 129 ifneq ($(KERNEL_LEGACY_DIR),true)
 130 $(KERNEL_USR): $(KERNEL_HEADERS_INSTALL)
 131         rm -rf $(KERNEL_SYMLINK)
 132         ln -s kernel/$(TARGET_KERNEL) $(KERNEL_SYMLINK)
 133
 134 $(TARGET_PREBUILT_INT_KERNEL): $(KERNEL_USR)
 135 endif
 136
 137 $(KERNEL_OUT):
 138         mkdir -p $(KERNEL_OUT)
 139
 140 $(KERNEL_CONFIG): $(KERNEL_OUT)
 141         $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(KERNEL_DEFCONFIG)
 142         $(hide) if [ ! -z "$(KERNEL_CONFIG_OVERRIDE)" ]; then \
 143                         echo "Overriding kernel config with '$(KERNEL_CONFIG_OVERRIDE)'"; \
 144                         echo $(KERNEL_CONFIG_OVERRIDE) >> $(KERNEL_OUT)/.config; \
 145                         $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) oldconfig; fi
 146
 147 $(TARGET_PREBUILT_INT_KERNEL): $(KERNEL_OUT) $(KERNEL_HEADERS_INSTALL)
 148         $(hide) echo "Building kernel..."
 149         $(hide) rm -rf $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/dts
 150         $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(KERNEL_CFLAGS)
 151         $(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
 152         $(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
 153         $(mv-modules)
 154         $(clean-module-folder)
 155
 156 $(KERNEL_HEADERS_INSTALL): $(KERNEL_OUT)
 157         $(hide) if [ ! -z "$(KERNEL_HEADER_DEFCONFIG)" ]; then \
 158                         rm -f $(BUILD_ROOT_LOC)$(KERNEL_CONFIG); \
 159                         $(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); \
 160                         $(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
 161         $(hide) if [ "$(KERNEL_HEADER_DEFCONFIG)" != "$(KERNEL_DEFCONFIG)" ]; then \
 162                         echo "Used a different defconfig for header generation"; \
 163                         rm -f $(BUILD_ROOT_LOC)$(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) $(KERNEL_DEFCONFIG); fi
 165         $(hide) if [ ! -z "$(KERNEL_CONFIG_OVERRIDE)" ]; then \
 166                         echo "Overriding kernel config with '$(KERNEL_CONFIG_OVERRIDE)'"; \
 167                         echo $(KERNEL_CONFIG_OVERRIDE) >> $(KERNEL_OUT)/.config; \
 168                         $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) oldconfig; fi
 169
 170 kerneltags: $(KERNEL_OUT) $(KERNEL_CONFIG)
 171         $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) tags
 172
 173 kernelconfig: $(KERNEL_OUT) $(KERNEL_CONFIG)
 174         env KCONFIG_NOTIMESTAMP=true \
 175              $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) menuconfig
 176         env KCONFIG_NOTIMESTAMP=true \
 177              $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) savedefconfig
 178         cp $(KERNEL_OUT)/defconfig $(TARGET_KERNEL_SOURCE)/arch/$(KERNEL_ARCH)/configs/$(KERNEL_DEFCONFIG)
 179
 180 endif
 181 endif