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 include $(INCLUDE_DIR)/depends.mk
  10
  11 ifneq ($(DUMP),1)
  12   all: compile
  13 endif
  14
  15 KERNEL_FILE_DEPENDS=$(GENERIC_PATCH_DIR) $(PATCH_DIR) $(GENERIC_FILES_DIR) $(FILES_DIR)
  16 STAMP_PREPARED=$(LINUX_DIR)/.prepared$(if $(QUILT)$(DUMP),,_$(shell $(call find_md5,$(KERNEL_FILE_DEPENDS),)))
  17 STAMP_CONFIGURED:=$(LINUX_DIR)/.configured
  18 include $(INCLUDE_DIR)/download.mk
  19 include $(INCLUDE_DIR)/quilt.mk
  20 include $(INCLUDE_DIR)/kernel-defaults.mk
  21
  22 define Kernel/Prepare
  23         $(call Kernel/Prepare/Default)
  24 endef
  25
  26 define Kernel/Configure
  27         $(call Kernel/Configure/Default)
  28 endef
  29
  30 define Kernel/CompileModules
  31         $(call Kernel/CompileModules/Default)
  32 endef
  33
  34 define Kernel/CompileImage
  35         $(call Kernel/CompileImage/Default)
  36         $(call Kernel/CompileImage/Initramfs)
  37 endef
  38
  39 define Kernel/Clean
  40         $(call Kernel/Clean/Default)
  41 endef
  42
  43 define Download/kernel
  44   URL:=$(LINUX_SITE)
  45   FILE:=$(LINUX_SOURCE)
  46   MD5SUM:=$(LINUX_KERNEL_MD5SUM)
  47 endef
  48
  49 ifdef CONFIG_COLLECT_KERNEL_DEBUG
  50   define Kernel/CollectDebug
  51         rm -rf $(KERNEL_BUILD_DIR)/debug
  52         mkdir -p $(KERNEL_BUILD_DIR)/debug/modules
  53         $(CP) $(LINUX_DIR)/vmlinux $(KERNEL_BUILD_DIR)/debug/
  54         -$(CP) \
  55                 $(STAGING_DIR_ROOT)/lib/modules/$(LINUX_VERSION)/* \
  56                 $(KERNEL_BUILD_DIR)/debug/modules/
  57         $(FIND) $(KERNEL_BUILD_DIR)/debug -type f | $(XARGS) $(KERNEL_CROSS)strip --only-keep-debug
  58         $(TAR) c -C $(KERNEL_BUILD_DIR) debug \
  59                 $(if $(SOURCE_DATE_EPOCH),--mtime="@$(SOURCE_DATE_EPOCH)") \
  60                 | bzip2 -c -9 > $(BIN_DIR)/kernel-debug.tar.bz2
  61   endef
  62 endif
  63
  64 ifeq ($(DUMP)$(filter prereq clean refresh update,$(MAKECMDGOALS)),)
  65   ifneq ($(if $(QUILT),,$(CONFIG_AUTOREBUILD)),)
  66     define Kernel/Autoclean
  67       $(PKG_BUILD_DIR)/.dep_files: $(STAMP_PREPARED)
  68       $(call rdep,$(KERNEL_FILE_DEPENDS),$(STAMP_PREPARED),$(PKG_BUILD_DIR)/.dep_files,-x "*/.dep_*")
  69     endef
  70   endif
  71 endif
  72
  73 define BuildKernel
  74   $(if $(QUILT),$(Build/Quilt))
  75   $(if $(LINUX_SITE),$(call Download,kernel))
  76
  77   .NOTPARALLEL:
  78
  79   $(Kernel/Autoclean)
  80   $(STAMP_PREPARED): $(if $(LINUX_SITE),$(DL_DIR)/$(LINUX_SOURCE))
  81         -rm -rf $(KERNEL_BUILD_DIR)
  82         -mkdir -p $(KERNEL_BUILD_DIR)
  83         $(Kernel/Prepare)
  84         touch $$@
  85
  86   $(KERNEL_BUILD_DIR)/symtab.h: FORCE
  87         rm -f $(KERNEL_BUILD_DIR)/symtab.h
  88         touch $(KERNEL_BUILD_DIR)/symtab.h
  89         +$(MAKE) $(KERNEL_MAKEOPTS) vmlinux
  90         find $(LINUX_DIR) $(STAGING_DIR_ROOT)/lib/modules -name \*.ko | \
  91                 xargs $(TARGET_CROSS)nm | \
  92                 awk '$$$$1 == "U" { print $$$$2 } ' | \
  93                 sort -u > $(KERNEL_BUILD_DIR)/mod_symtab.txt
  94         $(TARGET_CROSS)nm -n $(LINUX_DIR)/vmlinux.o | grep ' [rR] __ksymtab' | sed -e 's,........ [rR] __ksymtab_,,' > $(KERNEL_BUILD_DIR)/kernel_symtab.txt
  95         grep -Ff $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_include.txt
  96         grep -Fvf $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_exclude.txt
  97         ( \
  98                 echo '#define SYMTAB_KEEP \'; \
  99                 cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
 100                         awk '{print "KEEP(*(___ksymtab+" $$$$1 ")) \\" }'; \
 101                 echo; \
 102                 echo '#define SYMTAB_KEEP_GPL \'; \
 103                 cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
 104                         awk '{print "KEEP(*(___ksymtab_gpl+" $$$$1 ")) \\" }'; \
 105                 echo; \
 106                 echo '#define SYMTAB_DISCARD \'; \
 107                 cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
 108                         awk '{print "*(___ksymtab+" $$$$1 ") \\" }'; \
 109                 echo; \
 110                 echo '#define SYMTAB_DISCARD_GPL \'; \
 111                 cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
 112                         awk '{print "*(___ksymtab_gpl+" $$$$1 ") \\" }'; \
 113                 echo; \
 114         ) > $$@
 115
 116   $(STAMP_CONFIGURED): $(STAMP_PREPARED) $(LINUX_KCONFIG_LIST) $(TOPDIR)/.config FORCE
 117         $(Kernel/Configure)
 118         touch $$@
 119
 120   $(LINUX_DIR)/.modules: $(STAMP_CONFIGURED) $(LINUX_DIR)/.config FORCE
 121         $(Kernel/CompileModules)
 122         touch $$@
 123
 124   $(LINUX_DIR)/.image: $(STAMP_CONFIGURED) $(if $(CONFIG_STRIP_KERNEL_EXPORTS),$(KERNEL_BUILD_DIR)/symtab.h) FORCE
 125         $(Kernel/CompileImage)
 126         $(Kernel/CollectDebug)
 127         touch $$@
 128
 129   mostlyclean: FORCE
 130         $(Kernel/Clean)
 131
 132   define BuildKernel
 133   endef
 134
 135   download: $(if $(LINUX_SITE),$(DL_DIR)/$(LINUX_SOURCE))
 136   prepare: $(STAMP_CONFIGURED)
 137   compile: $(LINUX_DIR)/.modules
 138         $(MAKE) -C image compile TARGET_BUILD=
 139
 140   oldconfig menuconfig nconfig: $(STAMP_PREPARED) $(STAMP_CHECKED) FORCE
 141         rm -f $(LINUX_DIR)/.config.prev
 142         rm -f $(STAMP_CONFIGURED)
 143         $(LINUX_RECONF_CMD) > $(LINUX_DIR)/.config
 144         $(_SINGLE)$(MAKE) -C $(LINUX_DIR) $(KERNEL_MAKEOPTS) $$@
 145         $(LINUX_RECONF_DIFF) $(LINUX_DIR)/.config > $(LINUX_RECONFIG_TARGET)
 146
 147   install: $(LINUX_DIR)/.image
 148         +$(MAKE) -C image compile install TARGET_BUILD=
 149
 150   clean: FORCE
 151         rm -rf $(KERNEL_BUILD_DIR)
 152
 153   image-prereq:
 154         @+$(NO_TRACE_MAKE) -s -C image prereq TARGET_BUILD=
 155
 156   prereq: image-prereq
 157
 158 endef