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:=$(LINUX_SOURCE)
  46   HASH:=$(LINUX_KERNEL_HASH)
  47 endef
  48
  49 KERNEL_GIT_OPTS:=
  50 ifneq ($(strip $(CONFIG_KERNEL_GIT_LOCAL_REPOSITORY)),"")
  51   KERNEL_GIT_OPTS+=--reference $(CONFIG_KERNEL_GIT_LOCAL_REPOSITORY)
  52 endif
  53
  54 ifneq ($(strip $(CONFIG_KERNEL_GIT_BRANCH)),"")
  55   KERNEL_GIT_OPTS+=--branch $(CONFIG_KERNEL_GIT_BRANCH)
  56 endif
  57
  58 define Download/git-kernel
  59   URL:=$(call qstrip,$(CONFIG_KERNEL_GIT_CLONE_URI))
  60   PROTO:=git
  61   VERSION:=$(CONFIG_KERNEL_GIT_BRANCH)
  62   FILE:=$(LINUX_SOURCE)
  63   SUBDIR:=linux-$(KERNEL_PATCHVER)
  64   OPTS:=$(KERNEL_GIT_OPTS)
  65 endef
  66
  67 ifdef CONFIG_COLLECT_KERNEL_DEBUG
  68   define Kernel/CollectDebug
  69         rm -rf $(KERNEL_BUILD_DIR)/debug
  70         mkdir -p $(KERNEL_BUILD_DIR)/debug/modules
  71         $(CP) $(LINUX_DIR)/vmlinux $(KERNEL_BUILD_DIR)/debug/
  72         -$(CP) \
  73                 $(STAGING_DIR_ROOT)/lib/modules/$(LINUX_VERSION)/* \
  74                 $(KERNEL_BUILD_DIR)/debug/modules/
  75         $(FIND) $(KERNEL_BUILD_DIR)/debug -type f | $(XARGS) $(KERNEL_CROSS)strip --only-keep-debug
  76         $(TAR) c -C $(KERNEL_BUILD_DIR) debug \
  77                 $(if $(SOURCE_DATE_EPOCH),--mtime="@$(SOURCE_DATE_EPOCH)") \
  78                 | bzip2 -c -9 > $(BIN_DIR)/kernel-debug.tar.bz2
  79   endef
  80 endif
  81
  82 ifeq ($(DUMP)$(filter prereq clean refresh update,$(MAKECMDGOALS)),)
  83   ifneq ($(if $(QUILT),,$(CONFIG_AUTOREBUILD)),)
  84     define Kernel/Autoclean
  85       $(PKG_BUILD_DIR)/.dep_files: $(STAMP_PREPARED)
  86       $(call rdep,$(KERNEL_FILE_DEPENDS),$(STAMP_PREPARED),$(PKG_BUILD_DIR)/.dep_files,-x "*/.dep_*")
  87     endef
  88   endif
  89 endif
  90
  91 define BuildKernel
  92   $(if $(QUILT),$(Build/Quilt))
  93   $(if $(LINUX_SITE),$(call Download,kernel))
  94   $(if $(call qstrip,$(CONFIG_KERNEL_GIT_CLONE_URI)),$(call Download,git-kernel))
  95
  96   .NOTPARALLEL:
  97
  98   $(Kernel/Autoclean)
  99   $(STAMP_PREPARED): $(if $(LINUX_SITE),$(DL_DIR)/$(LINUX_SOURCE))
 100         -rm -rf $(KERNEL_BUILD_DIR)
 101         -mkdir -p $(KERNEL_BUILD_DIR)
 102         $(Kernel/Prepare)
 103         touch $$@
 104
 105   $(KERNEL_BUILD_DIR)/symtab.h: FORCE
 106         rm -f $(KERNEL_BUILD_DIR)/symtab.h
 107         touch $(KERNEL_BUILD_DIR)/symtab.h
 108         +$(MAKE) $(KERNEL_MAKEOPTS) vmlinux
 109         find $(LINUX_DIR) $(STAGING_DIR_ROOT)/lib/modules -name \*.ko | \
 110                 xargs $(TARGET_CROSS)nm | \
 111                 awk '$$$$1 == "U" { print $$$$2 } ' | \
 112                 sort -u > $(KERNEL_BUILD_DIR)/mod_symtab.txt
 113         $(TARGET_CROSS)nm -n $(LINUX_DIR)/vmlinux.o | grep ' [rR] __ksymtab' | sed -e 's,........ [rR] __ksymtab_,,' > $(KERNEL_BUILD_DIR)/kernel_symtab.txt
 114         grep -Ff $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_include.txt
 115         grep -Fvf $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_exclude.txt
 116         ( \
 117                 echo '#define SYMTAB_KEEP \'; \
 118                 cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
 119                         awk '{print "KEEP(*(___ksymtab+" $$$$1 ")) \\" }'; \
 120                 echo; \
 121                 echo '#define SYMTAB_KEEP_GPL \'; \
 122                 cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
 123                         awk '{print "KEEP(*(___ksymtab_gpl+" $$$$1 ")) \\" }'; \
 124                 echo; \
 125                 echo '#define SYMTAB_DISCARD \'; \
 126                 cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
 127                         awk '{print "*(___ksymtab+" $$$$1 ") \\" }'; \
 128                 echo; \
 129                 echo '#define SYMTAB_DISCARD_GPL \'; \
 130                 cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
 131                         awk '{print "*(___ksymtab_gpl+" $$$$1 ") \\" }'; \
 132                 echo; \
 133         ) > $$@
 134
 135   $(STAMP_CONFIGURED): $(STAMP_PREPARED) $(LINUX_KCONFIG_LIST) $(TOPDIR)/.config FORCE
 136         $(Kernel/Configure)
 137         touch $$@
 138
 139   $(LINUX_DIR)/.modules: $(STAMP_CONFIGURED) $(LINUX_DIR)/.config FORCE
 140         $(Kernel/CompileModules)
 141         touch $$@
 142
 143   $(LINUX_DIR)/.image: $(STAMP_CONFIGURED) $(if $(CONFIG_STRIP_KERNEL_EXPORTS),$(KERNEL_BUILD_DIR)/symtab.h) FORCE
 144         $(Kernel/CompileImage)
 145         $(Kernel/CollectDebug)
 146         touch $$@
 147
 148   mostlyclean: FORCE
 149         $(Kernel/Clean)
 150
 151   define BuildKernel
 152   endef
 153
 154   download: $(if $(LINUX_SITE),$(DL_DIR)/$(LINUX_SOURCE))
 155   prepare: $(STAMP_CONFIGURED)
 156   compile: $(LINUX_DIR)/.modules
 157         $(MAKE) -C image compile TARGET_BUILD=
 158
 159   oldconfig menuconfig nconfig: $(STAMP_PREPARED) $(STAMP_CHECKED) FORCE
 160         rm -f $(LINUX_DIR)/.config.prev
 161         rm -f $(STAMP_CONFIGURED)
 162         $(LINUX_RECONF_CMD) > $(LINUX_DIR)/.config
 163         $(_SINGLE)$(MAKE) -C $(LINUX_DIR) $(KERNEL_MAKEOPTS) HOST_LOADLIBES="-L$(STAGING_DIR_HOST)/lib -lncurses" $$@
 164         $(LINUX_RECONF_DIFF) $(LINUX_DIR)/.config > $(LINUX_RECONFIG_TARGET)
 165
 166   install: $(LINUX_DIR)/.image
 167         +$(MAKE) -C image compile install TARGET_BUILD=
 168
 169   clean: FORCE
 170         rm -rf $(KERNEL_BUILD_DIR)
 171
 172   image-prereq:
 173         @+$(NO_TRACE_MAKE) -s -C image prereq TARGET_BUILD=
 174
 175   prereq: image-prereq
 176
 177 endef