1#
2# Copyright (c) 2013 The Linux Foundation. All rights reserved.
3# Copyright (C) 2006-2007 OpenWrt.org
4#
5# This is free software, licensed under the GNU General Public License v2.
6# See /LICENSE for more information.
7#
8include $(INCLUDE_DIR)/host.mk
9include $(INCLUDE_DIR)/prereq.mk
10
11ifneq ($(DUMP),1)
12  all: compile
13endif
14
15export QUILT=1
16STAMP_PREPARED:=$(LINUX_DIR)/.prepared
17STAMP_CONFIGURED:=$(LINUX_DIR)/.configured
18include $(INCLUDE_DIR)/download.mk
19include $(INCLUDE_DIR)/quilt.mk
20include $(INCLUDE_DIR)/kernel-defaults.mk
21
22define Kernel/Prepare
23	$(call Kernel/Prepare/Default)
24endef
25
26define Kernel/Configure
27	$(call Kernel/Configure/Default)
28endef
29
30define Kernel/CompileModules
31	$(call Kernel/CompileModules/Default)
32endef
33
34define Kernel/CompileImage
35	$(call Kernel/CompileImage/Default)
36endef
37
38define Kernel/Clean
39	$(call Kernel/Clean/Default)
40endef
41
42define Download/kernel
43  URL:=$(LINUX_SITE)
44  FILE:=$(LINUX_SOURCE)
45  MD5SUM:=$(LINUX_KERNEL_MD5SUM)
46endef
47
48ifdef CONFIG_COLLECT_KERNEL_DEBUG
49  define Kernel/CollectDebug
50	rm -rf $(KERNEL_BUILD_DIR)/debug
51	mkdir -p $(KERNEL_BUILD_DIR)/debug/modules
52	$(CP) $(LINUX_DIR)/vmlinux $(KERNEL_BUILD_DIR)/debug/
53	-$(CP) \
54		$(STAGING_DIR_ROOT)/lib/modules/$(LINUX_VERSION)/* \
55		$(KERNEL_BUILD_DIR)/debug/modules/
56	$(FIND) $(KERNEL_BUILD_DIR)/debug -type f | $(XARGS) $(KERNEL_CROSS)strip --only-keep-debug
57	$(TAR) c -C $(KERNEL_BUILD_DIR) debug | bzip2 -c -9 > $(BIN_DIR)/kernel-debug.tar.bz2
58  endef
59endif
60
61define BuildKernel
62  $(if $(QUILT),$(Build/Quilt))
63  $(if $(LINUX_SITE),$(call Download,kernel))
64
65  $(STAMP_PREPARED): $(DL_DIR)/$(LINUX_SOURCE)
66	-rm -rf $(KERNEL_BUILD_DIR)
67	-mkdir -p $(KERNEL_BUILD_DIR)
68	$(Kernel/Prepare)
69	touch $$@
70
71  $(KERNEL_BUILD_DIR)/symtab.txt: FORCE
72	find $(LINUX_DIR) $(STAGING_DIR_ROOT)/lib/modules -name \*.ko | \
73		xargs $(TARGET_CROSS)nm | \
74		awk '$$$$1 == "U" { print $$$$2 } ' | \
75		sort -u > $$@
76
77  $(KERNEL_BUILD_DIR)/symtab.h: $(KERNEL_BUILD_DIR)/symtab.txt
78	( \
79		echo '#define SYMTAB_KEEP \'; \
80		cat $(KERNEL_BUILD_DIR)/symtab.txt | \
81			awk '{print "*(__ksymtab." $$$$1 ") \\" }'; \
82		echo; \
83		echo '#define SYMTAB_KEEP_GPL \'; \
84		cat $(KERNEL_BUILD_DIR)/symtab.txt | \
85			awk '{print "*(__ksymtab_gpl." $$$$1 ") \\" }'; \
86		echo; \
87		echo '#define SYMTAB_KEEP_STR \'; \
88		cat $(KERNEL_BUILD_DIR)/symtab.txt | \
89			awk '{print "*(__ksymtab_strings." $$$$1 ") \\" }'; \
90		echo; \
91	) > $$@
92
93  $(STAMP_CONFIGURED): $(STAMP_PREPARED) $(LINUX_KCONFIG_LIST) $(TOPDIR)/.config
94	$(Kernel/Configure)
95	touch $$@
96
97  $(LINUX_DIR)/.modules: $(STAMP_CONFIGURED) $(LINUX_DIR)/.config FORCE
98	$(Kernel/CompileModules)
99	touch $$@
100
101  $(LINUX_DIR)/.image: $(STAMP_CONFIGURED) $(if $(CONFIG_STRIP_KERNEL_EXPORTS),$(KERNEL_BUILD_DIR)/symtab.h) FORCE
102	$(Kernel/CompileImage)
103	$(Kernel/CollectDebug)
104	touch $$@
105	
106  mostlyclean: FORCE
107	$(Kernel/Clean)
108
109  define BuildKernel
110  endef
111
112  download: $(DL_DIR)/$(LINUX_SOURCE)
113  prepare: $(STAMP_CONFIGURED)
114  compile: $(LINUX_DIR)/.modules
115	$(MAKE) -C image compile TARGET_BUILD=
116
117  oldconfig menuconfig nconfig: $(STAMP_PREPARED) $(STAMP_CHECKED) FORCE
118	rm -f $(STAMP_CONFIGURED)
119	$(LINUX_RECONF_CMD) > $(LINUX_DIR)/.config
120	$(_SINGLE)$(MAKE) -C $(LINUX_DIR) $(KERNEL_MAKEOPTS) $$@
121	$(LINUX_RECONF_DIFF) $(LINUX_DIR)/.config > $(LINUX_RECONFIG_TARGET)
122
123  install: $(LINUX_DIR)/.image
124	+$(MAKE) -C image compile install TARGET_BUILD=
125
126  clean: FORCE
127	rm -rf $(KERNEL_BUILD_DIR)
128
129  image-prereq:
130	@+$(NO_TRACE_MAKE) -s -C image prereq TARGET_BUILD=
131
132  prereq: image-prereq
133
134endef
135