Root/include/kernel-build.mk

1#
2# Copyright (C) 2006-2007 OpenWrt.org
3#
4# This is free software, licensed under the GNU General Public License v2.
5# See /LICENSE for more information.
6#
7include $(INCLUDE_DIR)/host.mk
8include $(INCLUDE_DIR)/prereq.mk
9
10ifneq ($(DUMP),1)
11  all: compile
12endif
13
14export QUILT=1
15STAMP_PREPARED:=$(LINUX_DIR)/.prepared
16STAMP_CONFIGURED:=$(LINUX_DIR)/.configured
17include $(INCLUDE_DIR)/download.mk
18include $(INCLUDE_DIR)/quilt.mk
19include $(INCLUDE_DIR)/kernel-defaults.mk
20
21define Kernel/Prepare
22    $(call Kernel/Prepare/Default)
23endef
24
25define Kernel/Configure
26    $(call Kernel/Configure/Default)
27endef
28
29define Kernel/CompileModules
30    $(call Kernel/CompileModules/Default)
31endef
32
33define Kernel/CompileImage
34    $(call Kernel/CompileImage/Default)
35endef
36
37define Kernel/Clean
38    $(call Kernel/Clean/Default)
39endef
40
41define Download/kernel
42  URL:=$(LINUX_SITE)
43  FILE:=$(LINUX_SOURCE)
44  MD5SUM:=$(LINUX_KERNEL_MD5SUM)
45endef
46
47ifdef CONFIG_COLLECT_KERNEL_DEBUG
48  define Kernel/CollectDebug
49    rm -rf $(KERNEL_BUILD_DIR)/debug
50    mkdir -p $(KERNEL_BUILD_DIR)/debug/modules
51    $(CP) $(LINUX_DIR)/vmlinux $(KERNEL_BUILD_DIR)/debug/
52    -$(CP) \
53        $(STAGING_DIR_ROOT)/lib/modules/$(LINUX_VERSION)/* \
54        $(KERNEL_BUILD_DIR)/debug/modules/
55    $(FIND) $(KERNEL_BUILD_DIR)/debug -type f | $(XARGS) $(KERNEL_CROSS)strip --only-keep-debug
56    $(TAR) c -C $(KERNEL_BUILD_DIR) debug | bzip2 -c -9 > $(BIN_DIR)/kernel-debug.tar.bz2
57  endef
58endif
59
60define BuildKernel
61  $(if $(QUILT),$(Build/Quilt))
62  $(if $(LINUX_SITE),$(call Download,kernel))
63
64  $(STAMP_PREPARED): $(if $(LINUX_SITE),$(DL_DIR)/$(LINUX_SOURCE))
65    -rm -rf $(KERNEL_BUILD_DIR)
66    -mkdir -p $(KERNEL_BUILD_DIR)
67    $(Kernel/Prepare)
68    touch $$@
69
70  $(KERNEL_BUILD_DIR)/symtab.h: FORCE
71    rm -f $(KERNEL_BUILD_DIR)/symtab.h
72    touch $(KERNEL_BUILD_DIR)/symtab.h
73    +$(MAKE) $(KERNEL_MAKEOPTS) vmlinux
74    find $(LINUX_DIR) $(STAGING_DIR_ROOT)/lib/modules -name \*.ko | \
75        xargs $(TARGET_CROSS)nm | \
76        awk '$$$$1 == "U" { print $$$$2 } ' | \
77        sort -u > $(KERNEL_BUILD_DIR)/mod_symtab.txt
78    $(TARGET_CROSS)nm -n $(LINUX_DIR)/vmlinux.o | grep ' r __ksymtab' | sed -e 's,........ r __ksymtab_,,' > $(KERNEL_BUILD_DIR)/kernel_symtab.txt
79    grep -f $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_include.txt
80    grep -vf $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_exclude.txt
81    ( \
82        echo '#define SYMTAB_KEEP \'; \
83        cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
84            awk '{print "*(__ksymtab." $$$$1 ") \\" }'; \
85        echo; \
86        echo '#define SYMTAB_KEEP_GPL \'; \
87        cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
88            awk '{print "*(__ksymtab_gpl." $$$$1 ") \\" }'; \
89        echo; \
90        echo '#define SYMTAB_KEEP_STR \'; \
91        cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
92            awk '{print "*(__ksymtab_strings." $$$$1 ") \\" }'; \
93        echo; \
94        echo '#define SYMTAB_DISCARD \'; \
95        cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
96            awk '{print "*(__ksymtab." $$$$1 ") \\" }'; \
97        echo; \
98        echo '#define SYMTAB_DISCARD_GPL \'; \
99        cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
100            awk '{print "*(__ksymtab_gpl." $$$$1 ") \\" }'; \
101        echo; \
102        echo '#define SYMTAB_DISCARD_STR \'; \
103        cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
104            awk '{print "*(__ksymtab_strings." $$$$1 ") \\" }'; \
105        echo; \
106    ) > $$@
107
108  $(STAMP_CONFIGURED): $(STAMP_PREPARED) $(LINUX_KCONFIG_LIST) $(TOPDIR)/.config
109    $(Kernel/Configure)
110    touch $$@
111
112  $(LINUX_DIR)/.modules: $(STAMP_CONFIGURED) $(LINUX_DIR)/.config FORCE
113    $(Kernel/CompileModules)
114    touch $$@
115
116  $(LINUX_DIR)/.image: $(STAMP_CONFIGURED) $(if $(CONFIG_STRIP_KERNEL_EXPORTS),$(KERNEL_BUILD_DIR)/symtab.h) FORCE
117    $(Kernel/CompileImage)
118    $(Kernel/CollectDebug)
119    touch $$@
120    
121  mostlyclean: FORCE
122    $(Kernel/Clean)
123
124  define BuildKernel
125  endef
126
127  download: $(DL_DIR)/$(LINUX_SOURCE)
128  prepare: $(STAMP_CONFIGURED)
129  compile: $(LINUX_DIR)/.modules
130    $(MAKE) -C image compile TARGET_BUILD=
131
132  oldconfig menuconfig nconfig: $(STAMP_PREPARED) $(STAMP_CHECKED) FORCE
133    rm -f $(STAMP_CONFIGURED)
134    $(LINUX_RECONF_CMD) > $(LINUX_DIR)/.config
135    $(_SINGLE)$(MAKE) -C $(LINUX_DIR) $(KERNEL_MAKEOPTS) $$@
136    $(LINUX_RECONF_DIFF) $(LINUX_DIR)/.config > $(LINUX_RECONFIG_TARGET)
137
138  install: $(LINUX_DIR)/.image
139    +$(MAKE) -C image compile install TARGET_BUILD=
140
141  clean: FORCE
142    rm -rf $(KERNEL_BUILD_DIR)
143
144  image-prereq:
145    @+$(NO_TRACE_MAKE) -s -C image prereq TARGET_BUILD=
146
147  prereq: image-prereq
148
149endef
150

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