aboutsummaryrefslogtreecommitdiffstats
path: root/include/kernel-build.mk
blob: e98d801939aaa7f741638b4ea50bb0e77e8303a9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
#
# Copyright (C) 2006-2007 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
include $(INCLUDE_DIR)/prereq.mk
include $(INCLUDE_DIR)/depends.mk

ifneq ($(DUMP),1)
  all: compile
endif

KERNEL_FILE_DEPENDS=$(GENERIC_PATCH_DIR) $(PATCH_DIR) $(GENERIC_FILES_DIR) $(FILES_DIR)
STAMP_PREPARED=$(LINUX_DIR)/.prepared$(if $(QUILT)$(DUMP),,_$(shell $(call find_md5,$(KERNEL_FILE_DEPENDS),)))
STAMP_CONFIGURED:=$(LINUX_DIR)/.configured
include $(INCLUDE_DIR)/download.mk
include $(INCLUDE_DIR)/quilt.mk
include $(INCLUDE_DIR)/kernel-defaults.mk

define Kernel/Prepare
	$(call Kernel/Prepare/Default)
endef

define Kernel/Configure
	$(call Kernel/Configure/Default)
endef

define Kernel/CompileModules
	$(call Kernel/CompileModules/Default)
endef

define Kernel/CompileImage
	$(call Kernel/CompileImage/Default)
	$(call Kernel/CompileImage/Initramfs)
endef

define Kernel/Clean
	$(call Kernel/Clean/Default)
endef

define Download/kernel
  URL:=$(LINUX_SITE)
  FILE:=$(LINUX_SOURCE)
  HASH:=$(LINUX_KERNEL_HASH)
endef

KERNEL_GIT_OPTS:=
ifneq ($(strip $(CONFIG_KERNEL_GIT_LOCAL_REPOSITORY)),"")
  KERNEL_GIT_OPTS+=--reference $(CONFIG_KERNEL_GIT_LOCAL_REPOSITORY)
endif

ifneq ($(strip $(CONFIG_KERNEL_GIT_BRANCH)),"")
  KERNEL_GIT_OPTS+=--branch $(CONFIG_KERNEL_GIT_BRANCH)
endif

define Download/git-kernel
  URL:=$(call qstrip,$(CONFIG_KERNEL_GIT_CLONE_URI))
  PROTO:=git
  VERSION:=$(CONFIG_KERNEL_GIT_BRANCH)
  FILE:=$(LINUX_SOURCE)
  SUBDIR:=linux-$(LINUX_VERSION)
  OPTS:=$(KERNEL_GIT_OPTS)
endef

ifdef CONFIG_COLLECT_KERNEL_DEBUG
  define Kernel/CollectDebug
	rm -rf $(KERNEL_BUILD_DIR)/debug
	mkdir -p $(KERNEL_BUILD_DIR)/debug/modules
	$(CP) $(LINUX_DIR)/vmlinux $(KERNEL_BUILD_DIR)/debug/
	-$(CP) \
		$(STAGING_DIR_ROOT)/lib/modules/$(LINUX_VERSION)/* \
		$(KERNEL_BUILD_DIR)/debug/modules/
	$(FIND) $(KERNEL_BUILD_DIR)/debug -type f | $(XARGS) $(KERNEL_CROSS)strip --only-keep-debug
	$(TAR) c -C $(KERNEL_BUILD_DIR) debug \
		$(if $(SOURCE_DATE_EPOCH),--mtime="@$(SOURCE_DATE_EPOCH)") \
		| bzip2 -c -9 > $(BIN_DIR)/kernel-debug.tar.bz2
  endef
endif

ifeq ($(DUMP)$(filter prereq clean refresh update,$(MAKECMDGOALS)),)
  ifneq ($(if $(QUILT),,$(CONFIG_AUTOREBUILD)),)
    define Kernel/Autoclean
      $(PKG_BUILD_DIR)/.dep_files: $(STAMP_PREPARED)
      $(call rdep,$(KERNEL_FILE_DEPENDS),$(STAMP_PREPARED),$(PKG_BUILD_DIR)/.dep_files,-x "*/.dep_*")
    endef
  endif
endif

define BuildKernel
  $(if $(QUILT),$(Build/Quilt))
  $(if $(LINUX_SITE),$(call Download,kernel))
  $(if $(call qstrip,$(CONFIG_KERNEL_GIT_CLONE_URI)),$(call Download,git-kernel))

  .NOTPARALLEL:

  $(Kernel/Autoclean)
  $(STAMP_PREPARED): $(if $(LINUX_SITE),$(DL_DIR)/$(LINUX_SOURCE))
	-rm -rf $(KERNEL_BUILD_DIR)
	-mkdir -p $(KERNEL_BUILD_DIR)
	$(Kernel/Prepare)
	touch $$@

  $(KERNEL_BUILD_DIR)/symtab.h: FORCE
	rm -f $(KERNEL_BUILD_DIR)/symtab.h
	touch $(KERNEL_BUILD_DIR)/symtab.h
	+$(KERNEL_MAKE) vmlinux
	find $(LINUX_DIR) $(STAGING_DIR_ROOT)/lib/modules -name \*.ko | \
		xargs $(TARGET_CROSS)nm | \
		awk '$$$$1 == "U" { print $$$$2 } ' | \
		sort -u > $(KERNEL_BUILD_DIR)/mod_symtab.txt
	$(TARGET_CROSS)nm -n $(LINUX_DIR)/vmlinux.o | grep ' [rR] __ksymtab' | sed -e 's,........ [rR] __ksymtab_,,' > $(KERNEL_BUILD_DIR)/kernel_symtab.txt
	grep -Ff $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_include.txt
	grep -Fvf $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_exclude.txt
	( \
		echo '#define SYMTAB_KEEP \'; \
		cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
			awk '{print "KEEP(*(___ksymtab+" $$$$1 ")) \\" }'; \
		echo; \
		echo '#define SYMTAB_KEEP_GPL \'; \
		cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
			awk '{print "KEEP(*(___ksymtab_gpl+" $$$$1 ")) \\" }'; \
		echo; \
		echo '#define SYMTAB_DISCARD \'; \
		cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
			awk '{print "*(___ksymtab+" $$$$1 ") \\" }'; \
		echo; \
		echo '#define SYMTAB_DISCARD_GPL \'; \
		cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
			awk '{print "*(___ksymtab_gpl+" $$$$1 ") \\" }'; \
		echo; \
	) > $$@

  $(STAMP_CONFIGURED): $(STAMP_PREPARED) $(LINUX_KCONFIG_LIST) $(TOPDIR)/.config FORCE
	$(Kernel/Configure)
	touch $$@

  $(LINUX_DIR)/.modules: $(STAMP_CONFIGURED) $(LINUX_DIR)/.config FORCE
	$(Kernel/CompileModules)
	touch $$@

  $(LINUX_DIR)/.image: $(STAMP_CONFIGURED) $(if $(CONFIG_STRIP_KERNEL_EXPORTS),$(KERNEL_BUILD_DIR)/symtab.h) FORCE
	$(Kernel/CompileImage)
	$(Kernel/CollectDebug)
	touch $$@
	
  mostlyclean: FORCE
	$(Kernel/Clean)

  define BuildKernel
  endef

  download: $(if $(LINUX_SITE),$(DL_DIR)/$(LINUX_SOURCE))
  prepare: $(STAMP_PREPARED)
  compile: $(LINUX_DIR)/.modules
	$(MAKE) -C image compile TARGET_BUILD=

  oldconfig menuconfig nconfig: $(STAMP_PREPARED) $(STAMP_CHECKED) FORCE
	rm -f $(LINUX_DIR)/.config.prev
	rm -f $(STAMP_CONFIGURED)
	$(LINUX_RECONF_CMD) > $(LINUX_DIR)/.config
	$(_SINGLE)$(KERNEL_MAKE) HOST_LOADLIBES="-L$(STAGING_DIR_HOST)/lib -lncurses" $$@
	$(LINUX_RECONF_DIFF) $(LINUX_DIR)/.config > $(LINUX_RECONFIG_TARGET)

  install: $(LINUX_DIR)/.image
	+$(MAKE) -C image compile install TARGET_BUILD=

  clean: FORCE
	rm -rf $(KERNEL_BUILD_DIR)

  image-prereq:
	@+$(NO_TRACE_MAKE) -s -C image prereq TARGET_BUILD=

  prereq: image-prereq

endef