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         $(call Kernel/CompileImage/Initramfs)
  36 endef
  37
  38 define Kernel/Clean
  39         $(call Kernel/Clean/Default)
  40 endef
  41
  42 define Download/kernel
  43   URL:=$(LINUX_SITE)
  44   FILE:=$(LINUX_SOURCE)
  45   MD5SUM:=$(LINUX_KERNEL_MD5SUM)
  46 endef
  47
  48 ifdef 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 \
  58                 $(if $(SOURCE_DATE_EPOCH),--mtime="@$(SOURCE_DATE_EPOCH)") \
  59                 | bzip2 -c -9 > $(BIN_DIR)/kernel-debug.tar.bz2
  60   endef
  61 endif
  62
  63 define BuildKernel
  64   $(if $(QUILT),$(Build/Quilt))
  65   $(if $(LINUX_SITE),$(call Download,kernel))
  66
  67   .NOTPARALLEL:
  68
  69   $(STAMP_PREPARED): $(if $(LINUX_SITE),$(DL_DIR)/$(LINUX_SOURCE))
  70         -rm -rf $(KERNEL_BUILD_DIR)
  71         -mkdir -p $(KERNEL_BUILD_DIR)
  72         $(Kernel/Prepare)
  73         touch $$@
  74
  75   $(KERNEL_BUILD_DIR)/symtab.h: FORCE
  76         rm -f $(KERNEL_BUILD_DIR)/symtab.h
  77         touch $(KERNEL_BUILD_DIR)/symtab.h
  78         +$(MAKE) $(KERNEL_MAKEOPTS) vmlinux
  79         find $(LINUX_DIR) $(STAGING_DIR_ROOT)/lib/modules -name \*.ko | \
  80                 xargs $(TARGET_CROSS)nm | \
  81                 awk '$$$$1 == "U" { print $$$$2 } ' | \
  82                 sort -u > $(KERNEL_BUILD_DIR)/mod_symtab.txt
  83         $(TARGET_CROSS)nm -n $(LINUX_DIR)/vmlinux.o | grep ' [rR] __ksymtab' | sed -e 's,........ [rR] __ksymtab_,,' > $(KERNEL_BUILD_DIR)/kernel_symtab.txt
  84         grep -Ff $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_include.txt
  85         grep -Fvf $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_exclude.txt
  86         ( \
  87                 echo '#define SYMTAB_KEEP \'; \
  88                 cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
  89                         awk '{print "KEEP(*(___ksymtab+" $$$$1 ")) \\" }'; \
  90                 echo; \
  91                 echo '#define SYMTAB_KEEP_GPL \'; \
  92                 cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
  93                         awk '{print "KEEP(*(___ksymtab_gpl+" $$$$1 ")) \\" }'; \
  94                 echo; \
  95                 echo '#define SYMTAB_DISCARD \'; \
  96                 cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
  97                         awk '{print "*(___ksymtab+" $$$$1 ") \\" }'; \
  98                 echo; \
  99                 echo '#define SYMTAB_DISCARD_GPL \'; \
 100                 cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
 101                         awk '{print "*(___ksymtab_gpl+" $$$$1 ") \\" }'; \
 102                 echo; \
 103         ) > $$@
 104
 105   $(STAMP_CONFIGURED): $(STAMP_PREPARED) $(LINUX_KCONFIG_LIST) $(TOPDIR)/.config
 106         $(Kernel/Configure)
 107         touch $$@
 108
 109   $(LINUX_DIR)/.modules: $(STAMP_CONFIGURED) $(LINUX_DIR)/.config FORCE
 110         $(Kernel/CompileModules)
 111         touch $$@
 112
 113   $(LINUX_DIR)/.image: $(STAMP_CONFIGURED) $(if $(CONFIG_STRIP_KERNEL_EXPORTS),$(KERNEL_BUILD_DIR)/symtab.h) FORCE
 114         $(Kernel/CompileImage)
 115         $(Kernel/CollectDebug)
 116         touch $$@
 117
 118   mostlyclean: FORCE
 119         $(Kernel/Clean)
 120
 121   define BuildKernel
 122   endef
 123
 124   download: $(if $(LINUX_SITE),$(DL_DIR)/$(LINUX_SOURCE))
 125   prepare: $(STAMP_CONFIGURED)
 126   compile: $(LINUX_DIR)/.modules
 127         $(MAKE) -C image compile TARGET_BUILD=
 128
 129   oldconfig menuconfig nconfig: $(STAMP_PREPARED) $(STAMP_CHECKED) FORCE
 130         rm -f $(LINUX_DIR)/.config.prev
 131         rm -f $(STAMP_CONFIGURED)
 132         $(LINUX_RECONF_CMD) > $(LINUX_DIR)/.config
 133         $(_SINGLE)$(MAKE) -C $(LINUX_DIR) $(KERNEL_MAKEOPTS) $$@
 134         $(LINUX_RECONF_DIFF) $(LINUX_DIR)/.config > $(LINUX_RECONFIG_TARGET)
 135
 136   install: $(LINUX_DIR)/.image
 137         +$(MAKE) -C image compile install TARGET_BUILD=
 138
 139   clean: FORCE
 140         rm -rf $(KERNEL_BUILD_DIR)
 141
 142   image-prereq:
 143         @+$(NO_TRACE_MAKE) -s -C image prereq TARGET_BUILD=
 144
 145   prereq: image-prereq
 146
 147 endef