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 #
   7 include $(INCLUDE_DIR)/host.mk
   8 include $(INCLUDE_DIR)/prereq.mk
   9
  10 ifneq ($(DUMP),1)
  11   all: compile
  12 endif
  13
  14 export QUILT=1
  15 STAMP_PREPARED:=$(LINUX_DIR)/.prepared
  16 STAMP_CONFIGURED:=$(LINUX_DIR)/.configured
  17 include $(INCLUDE_DIR)/download.mk
  18 include $(INCLUDE_DIR)/quilt.mk
  19 include $(INCLUDE_DIR)/kernel-defaults.mk
  20
  21 define Kernel/Prepare
  22         $(call Kernel/Prepare/Default)
  23 endef
  24
  25 define Kernel/Configure
  26         $(call Kernel/Configure/Default)
  27 endef
  28
  29 define Kernel/CompileModules
  30         $(call Kernel/CompileModules/Default)
  31 endef
  32
  33 define Kernel/CompileImage
  34         $(call Kernel/CompileImage/Default)
  35 endef
  36
  37 define Kernel/Clean
  38         $(call Kernel/Clean/Default)
  39 endef
  40
  41 define Download/kernel
  42   URL:=$(LINUX_SITE)
  43   FILE:=$(LINUX_SOURCE)
  44   MD5SUM:=$(LINUX_KERNEL_MD5SUM)
  45 endef
  46
  47 ifdef 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
  58 endif
  59
  60 define 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 $$@
  69
  70   $(KERNEL_BUILD_DIR)/symtab.h: FORCE
  71         rm -f $(KERNEL_BUILD_DIR)/symtab.h
  72         touch $(KERNEL_BUILD_DIR)/symtab.h
  73         +$(MAKE) $(KERNEL_MAKEOPTS) vmlinux
  74         find $(LINUX_DIR) $(STAGING_DIR_ROOT)/lib/modules -name \*.ko | \
  75                 xargs $(TARGET_CROSS)nm | \
  76                 awk '$$$$1 == "U" { print $$$$2 } ' | \
  77                 sort -u > $(KERNEL_BUILD_DIR)/mod_symtab.txt
  78         $(TARGET_CROSS)nm -n $(LINUX_DIR)/vmlinux.o | grep ' r __ksymtab' | sed -e 's,........ r __ksymtab_,,' > $(KERNEL_BUILD_DIR)/kernel_symtab.txt
  79         grep -f $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_include.txt
  80         grep -vf $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_exclude.txt
  81         ( \
  82                 echo '#define SYMTAB_KEEP \'; \
  83                 cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
  84                         awk '{print "KEEP(*(___ksymtab+" $$$$1 ")) \\" }'; \
  85                 echo; \
  86                 echo '#define SYMTAB_KEEP_GPL \'; \
  87                 cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
  88                         awk '{print "KEEP(*(___ksymtab_gpl+" $$$$1 ")) \\" }'; \
  89                 echo; \
  90                 echo '#define SYMTAB_DISCARD \'; \
  91                 cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
  92                         awk '{print "*(___ksymtab+" $$$$1 ") \\" }'; \
  93                 echo; \
  94                 echo '#define SYMTAB_DISCARD_GPL \'; \
  95                 cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
  96                         awk '{print "*(___ksymtab_gpl+" $$$$1 ") \\" }'; \
  97                 echo; \
  98         ) > $$@
  99
 100   $(STAMP_CONFIGURED): $(STAMP_PREPARED) $(LINUX_KCONFIG_LIST) $(TOPDIR)/.config
 101         $(Kernel/Configure)
 102         touch $$@
 103
 104   $(LINUX_DIR)/.modules: $(STAMP_CONFIGURED) $(LINUX_DIR)/.config FORCE
 105         $(Kernel/CompileModules)
 106         touch $$@
 107
 108   $(LINUX_DIR)/.image: $(STAMP_CONFIGURED) $(if $(CONFIG_STRIP_KERNEL_EXPORTS),$(KERNEL_BUILD_DIR)/symtab.h) FORCE
 109         $(Kernel/CompileImage)
 110         $(Kernel/CollectDebug)
 111         touch $$@
 112
 113   mostlyclean: FORCE
 114         $(Kernel/Clean)
 115
 116   define BuildKernel
 117   endef
 118
 119   download: $(DL_DIR)/$(LINUX_SOURCE)
 120   prepare: $(STAMP_CONFIGURED)
 121   compile: $(LINUX_DIR)/.modules
 122         $(MAKE) -C image compile TARGET_BUILD=
 123
 124   oldconfig menuconfig nconfig: $(STAMP_PREPARED) $(STAMP_CHECKED) FORCE
 125         rm -f $(STAMP_CONFIGURED)
 126         $(LINUX_RECONF_CMD) > $(LINUX_DIR)/.config
 127         $(_SINGLE)$(MAKE) -C $(LINUX_DIR) $(KERNEL_MAKEOPTS) $$@
 128         $(LINUX_RECONF_DIFF) $(LINUX_DIR)/.config > $(LINUX_RECONFIG_TARGET)
 129
 130   install: $(LINUX_DIR)/.image
 131         +$(MAKE) -C image compile install TARGET_BUILD=
 132
 133   clean: FORCE
 134         rm -rf $(KERNEL_BUILD_DIR)
 135
 136   image-prereq:
 137         @+$(NO_TRACE_MAKE) -s -C image prereq TARGET_BUILD=
 138
 139   prereq: image-prereq
 140
 141 endef