1#
2# Copyright (C) 2006-2015 OpenWrt.org
3#
4# This is free software, licensed under the GNU General Public License v2.
5# See /LICENSE for more information.
6#
7
8KERNEL_MAKEOPTS := -C $(LINUX_DIR) \
9	HOSTCFLAGS="$(HOST_CFLAGS) -Wall -Wmissing-prototypes -Wstrict-prototypes" \
10	CROSS_COMPILE="$(KERNEL_CROSS)" \
11	ARCH="$(LINUX_KARCH)" \
12	KBUILD_HAVE_NLS=no \
13	KBUILD_BUILD_USER="$(call qstrip,$(CONFIG_KERNEL_BUILD_USER))" \
14	KBUILD_BUILD_HOST="$(call qstrip,$(CONFIG_KERNEL_BUILD_DOMAIN))" \
15	CONFIG_SHELL="$(BASH)" \
16	$(if $(findstring c,$(OPENWRT_VERBOSE)),V=1,V='') \
17	$(if $(PKG_BUILD_ID),LDFLAGS_MODULE=--build-id=0x$(PKG_BUILD_ID))
18
19ifdef CONFIG_STRIP_KERNEL_EXPORTS
20  KERNEL_MAKEOPTS += \
21	EXTRA_LDSFLAGS="-I$(KERNEL_BUILD_DIR) -include symtab.h"
22endif
23
24INITRAMFS_EXTRA_FILES ?= $(GENERIC_PLATFORM_DIR)/image/initramfs-base-files.txt
25
26ifneq (,$(KERNEL_CC))
27  KERNEL_MAKEOPTS += CC="$(KERNEL_CC)"
28endif
29
30ifdef CONFIG_USE_SPARSE
31  KERNEL_MAKEOPTS += C=1 CHECK=$(STAGING_DIR_HOST)/bin/sparse
32endif
33
34export HOST_EXTRACFLAGS=-I$(STAGING_DIR_HOST)/include
35
36# defined in quilt.mk
37Kernel/Patch:=$(Kernel/Patch/Default)
38
39KERNEL_GIT_OPTS:=
40ifneq ($(strip $(CONFIG_KERNEL_GIT_LOCAL_REPOSITORY)),"")
41  KERNEL_GIT_OPTS+=--reference $(CONFIG_KERNEL_GIT_LOCAL_REPOSITORY)
42endif
43
44ifneq ($(strip $(CONFIG_KERNEL_GIT_BRANCH)),"")
45  KERNEL_GIT_OPTS+=--branch $(CONFIG_KERNEL_GIT_BRANCH)
46endif
47
48ifeq ($(strip $(CONFIG_EXTERNAL_KERNEL_TREE)),"")
49  ifeq ($(strip $(CONFIG_KERNEL_GIT_CLONE_URI)),"")
50    define Kernel/Prepare/Default
51	xzcat $(DL_DIR)/$(LINUX_SOURCE) | $(TAR) -C $(KERNEL_BUILD_DIR) $(TAR_OPTIONS)
52	$(Kernel/Patch)
53	touch $(LINUX_DIR)/.quilt_used
54    endef
55  else
56    define Kernel/Prepare/Default
57	git clone $(KERNEL_GIT_OPTS) $(CONFIG_KERNEL_GIT_CLONE_URI) $(LINUX_DIR)
58    endef
59  endif
60else
61  define Kernel/Prepare/Default
62	mkdir -p $(KERNEL_BUILD_DIR)
63	if [ -d $(LINUX_DIR) ]; then \
64		rmdir $(LINUX_DIR); \
65	fi
66	ln -s $(CONFIG_EXTERNAL_KERNEL_TREE) $(LINUX_DIR)
67  endef
68endif
69
70ifeq ($(CONFIG_TARGET_ROOTFS_INITRAMFS),y)
71  ifeq ($(strip $(CONFIG_EXTERNAL_CPIO)),"")
72    define Kernel/SetInitramfs/PreConfigure
73	grep -v -e INITRAMFS -e CONFIG_RD_ -e CONFIG_BLK_DEV_INITRD $(LINUX_DIR)/.config.old > $(LINUX_DIR)/.config
74	echo 'CONFIG_BLK_DEV_INITRD=y' >> $(LINUX_DIR)/.config
75	echo 'CONFIG_INITRAMFS_SOURCE="$(strip $(TARGET_DIR) $(INITRAMFS_EXTRA_FILES))"' >> $(LINUX_DIR)/.config
76    endef
77  else
78    define Kernel/SetInitramfs/PreConfigure
79	grep -v INITRAMFS $(LINUX_DIR)/.config.old > $(LINUX_DIR)/.config
80	echo 'CONFIG_INITRAMFS_SOURCE="$(call qstrip,$(CONFIG_EXTERNAL_CPIO))"' >> $(LINUX_DIR)/.config
81    endef
82  endif
83
84  define Kernel/SetInitramfs
85	rm -f $(LINUX_DIR)/.config.prev
86	mv $(LINUX_DIR)/.config $(LINUX_DIR)/.config.old
87	$(call Kernel/SetInitramfs/PreConfigure)
88	echo 'CONFIG_INITRAMFS_ROOT_UID=$(shell id -u)' >> $(LINUX_DIR)/.config
89	echo 'CONFIG_INITRAMFS_ROOT_GID=$(shell id -g)' >> $(LINUX_DIR)/.config
90	echo "$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_NONE),CONFIG_INITRAMFS_COMPRESSION_NONE=y,# CONFIG_INITRAMFS_COMPRESSION_NONE is not set)" >> $(LINUX_DIR)/.config
91	echo -e "$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_GZIP),CONFIG_INITRAMFS_COMPRESSION_GZIP=y\nCONFIG_RD_GZIP=y,# CONFIG_INITRAMFS_COMPRESSION_GZIP is not set\n# CONFIG_RD_GZIP is not set)" >> $(LINUX_DIR)/.config
92	echo -e "$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_BZIP2),CONFIG_INITRAMFS_COMPRESSION_BZIP2=y\nCONFIG_RD_BZIP2=y,# CONFIG_INITRAMFS_COMPRESSION_BZIP2 is not set\n# CONFIG_RD_BZIP2 is not set)" >> $(LINUX_DIR)/.config
93	echo -e "$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZMA),CONFIG_INITRAMFS_COMPRESSION_LZMA=y\nCONFIG_RD_LZMA=y,# CONFIG_INITRAMFS_COMPRESSION_LZMA is not set\n# CONFIG_RD_LZMA is not set)" >> $(LINUX_DIR)/.config
94	echo -e "$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZO),CONFIG_INITRAMFS_COMPRESSION_LZO=y\nCONFIG_RD_LZO=y,# CONFIG_INITRAMFS_COMPRESSION_LZO is not set\n# CONFIG_RD_LZO is not set)" >> $(LINUX_DIR)/.config
95	echo -e "$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_XZ),CONFIG_INITRAMFS_COMPRESSION_XZ=y\nCONFIG_RD_XZ=y,# CONFIG_INITRAMFS_COMPRESSION_XZ is not set\n# CONFIG_RD_XZ is not set)" >> $(LINUX_DIR)/.config
96	echo -e "$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZ4),CONFIG_INITRAMFS_COMPRESSION_LZ4=y\nCONFIG_RD_LZ4=y,# CONFIG_INITRAMFS_COMPRESSION_LZ4 is not set\n# CONFIG_RD_LZ4 is not set)" >> $(LINUX_DIR)/.config
97  endef
98else
99endif
100
101define Kernel/SetNoInitramfs
102	mv $(LINUX_DIR)/.config.set $(LINUX_DIR)/.config.old
103	grep -v INITRAMFS $(LINUX_DIR)/.config.old > $(LINUX_DIR)/.config.set
104	echo 'CONFIG_INITRAMFS_SOURCE=""' >> $(LINUX_DIR)/.config.set
105endef
106
107define Kernel/Configure/Default
108	$(LINUX_CONF_CMD) > $(LINUX_DIR)/.config.target
109# copy CONFIG_KERNEL_* settings over to .config.target
110	awk '/^(#[[:space:]]+)?CONFIG_KERNEL/{sub("CONFIG_KERNEL_","CONFIG_");print}' $(TOPDIR)/.config >> $(LINUX_DIR)/.config.target
111	echo "# CONFIG_KALLSYMS_EXTRA_PASS is not set" >> $(LINUX_DIR)/.config.target
112	echo "# CONFIG_KALLSYMS_ALL is not set" >> $(LINUX_DIR)/.config.target
113	echo "CONFIG_KALLSYMS_UNCOMPRESSED=y" >> $(LINUX_DIR)/.config.target
114	$(SCRIPT_DIR)/metadata.pl kconfig $(TMP_DIR)/.packageinfo $(TOPDIR)/.config $(KERNEL_PATCHVER) > $(LINUX_DIR)/.config.override
115	$(SCRIPT_DIR)/kconfig.pl 'm+' '+' $(LINUX_DIR)/.config.target /dev/null $(LINUX_DIR)/.config.override > $(LINUX_DIR)/.config.set
116	$(call Kernel/SetNoInitramfs)
117	rm -rf $(KERNEL_BUILD_DIR)/modules
118	cmp -s $(LINUX_DIR)/.config.set $(LINUX_DIR)/.config.prev || { \
119		cp $(LINUX_DIR)/.config.set $(LINUX_DIR)/.config; \
120		cp $(LINUX_DIR)/.config.set $(LINUX_DIR)/.config.prev; \
121	}
122	$(_SINGLE) [ -d $(LINUX_DIR)/user_headers ] || $(MAKE) $(KERNEL_MAKEOPTS) INSTALL_HDR_PATH=$(LINUX_DIR)/user_headers headers_install
123	$(SH_FUNC) grep '=[ym]' $(LINUX_DIR)/.config.set | LC_ALL=C sort | md5s > $(LINUX_DIR)/.vermagic
124endef
125
126define Kernel/Configure/Initramfs
127	$(call Kernel/SetInitramfs)
128endef
129
130define Kernel/CompileModules/Default
131	rm -f $(LINUX_DIR)/vmlinux $(LINUX_DIR)/System.map
132	+$(MAKE) $(KERNEL_MAKEOPTS) modules
133endef
134
135OBJCOPY_STRIP = -R .reginfo -R .notes -R .note -R .comment -R .mdebug -R .note.gnu.build-id
136
137# AMD64 shares the location with x86
138ifeq ($(LINUX_KARCH),x86_64)
139IMAGES_DIR:=../../x86/boot
140endif
141
142define Kernel/CopyImage
143	cmp -s $(LINUX_DIR)/vmlinux $(KERNEL_BUILD_DIR)/vmlinux$(1).debug || { \
144		$(KERNEL_CROSS)objcopy -O binary $(OBJCOPY_STRIP) -S $(LINUX_DIR)/vmlinux $(LINUX_KERNEL)$(1); \
145		$(KERNEL_CROSS)objcopy $(OBJCOPY_STRIP) -S $(LINUX_DIR)/vmlinux $(KERNEL_BUILD_DIR)/vmlinux$(1).elf; \
146		$(CP) $(LINUX_DIR)/vmlinux $(KERNEL_BUILD_DIR)/vmlinux$(1).debug; \
147		$(foreach k, \
148			$(if $(KERNEL_IMAGES),$(KERNEL_IMAGES),$(filter-out dtbs,$(KERNELNAME))), \
149			$(CP) $(LINUX_DIR)/arch/$(LINUX_KARCH)/boot/$(IMAGES_DIR)/$(k) $(KERNEL_BUILD_DIR)/$(k)$(1); \
150		) \
151	}
152endef
153
154define Kernel/CompileImage/Default
155	rm -f $(TARGET_DIR)/init
156	+$(MAKE) $(KERNEL_MAKEOPTS) $(if $(KERNELNAME),$(KERNELNAME),all) modules
157	$(call Kernel/CopyImage)
158endef
159
160ifneq ($(CONFIG_TARGET_ROOTFS_INITRAMFS),)
161define Kernel/CompileImage/Initramfs
162	$(call Kernel/Configure/Initramfs)
163	$(CP) $(GENERIC_PLATFORM_DIR)/base-files/init $(TARGET_DIR)/init
164	rm -rf $(KERNEL_BUILD_DIR)/linux-$(LINUX_VERSION)/usr/initramfs_data.cpio*
165	+$(MAKE) $(KERNEL_MAKEOPTS) $(if $(KERNELNAME),$(KERNELNAME),all) modules
166	$(call Kernel/CopyImage,-initramfs)
167endef
168else
169define Kernel/CompileImage/Initramfs
170endef
171endif
172
173define Kernel/Clean/Default
174	rm -f $(KERNEL_BUILD_DIR)/linux-$(LINUX_VERSION)/.configured
175	rm -f $(LINUX_KERNEL)
176	$(_SINGLE)$(MAKE) -C $(KERNEL_BUILD_DIR)/linux-$(LINUX_VERSION) clean
177endef
178
179
180