include/kernel-build.mk

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 #
   3 # Copyright (C) 2006-2020 OpenWrt.org
   4
   5 include $(INCLUDE_DIR)/prereq.mk
   6 include $(INCLUDE_DIR)/depends.mk
   7
   8 ifneq ($(DUMP),1)
   9   all: compile
  10 endif
  11
  12 KERNEL_FILE_DEPENDS=$(GENERIC_BACKPORT_DIR) $(GENERIC_PATCH_DIR) $(GENERIC_HACK_DIR) $(PATCH_DIR) $(GENERIC_FILES_DIR) $(FILES_DIR)
  13 STAMP_PREPARED=$(LINUX_DIR)/.prepared$(if $(QUILT)$(DUMP),,_$(shell $(call find_md5,$(KERNEL_FILE_DEPENDS),)))
  14 STAMP_CONFIGURED:=$(LINUX_DIR)/.configured
  15 include $(INCLUDE_DIR)/download.mk
  16 include $(INCLUDE_DIR)/quilt.mk
  17 include $(INCLUDE_DIR)/kernel-defaults.mk
  18
  19 define Kernel/Prepare
  20         $(call Kernel/Prepare/Default)
  21 endef
  22
  23 define Kernel/Configure
  24         $(call Kernel/Configure/Default)
  25 endef
  26
  27 define Kernel/CompileModules
  28         $(call Kernel/CompileModules/Default)
  29 endef
  30
  31 define Kernel/CompileImage
  32         $(call Kernel/CompileImage/Default)
  33         $(call Kernel/CompileImage/Initramfs)
  34 endef
  35
  36 define Kernel/Clean
  37         $(call Kernel/Clean/Default)
  38 endef
  39
  40 define Download/kernel
  41   URL:=$(LINUX_SITE)
  42   FILE:=$(LINUX_SOURCE)
  43   HASH:=$(LINUX_KERNEL_HASH)
  44 endef
  45
  46 KERNEL_GIT_OPTS:=
  47 ifneq ($(strip $(CONFIG_KERNEL_GIT_LOCAL_REPOSITORY)),"")
  48   KERNEL_GIT_OPTS+=--reference $(CONFIG_KERNEL_GIT_LOCAL_REPOSITORY)
  49 endif
  50
  51 define Download/git-kernel
  52   URL:=$(call qstrip,$(CONFIG_KERNEL_GIT_CLONE_URI))
  53   PROTO:=git
  54   VERSION:=$(CONFIG_KERNEL_GIT_REF)
  55   FILE:=$(LINUX_SOURCE)
  56   SUBDIR:=linux-$(LINUX_VERSION)
  57   OPTS:=$(KERNEL_GIT_OPTS)
  58 endef
  59
  60 ifdef CONFIG_COLLECT_KERNEL_DEBUG
  61   define Kernel/CollectDebug
  62         rm -rf $(KERNEL_BUILD_DIR)/debug
  63         mkdir -p $(KERNEL_BUILD_DIR)/debug/modules
  64         $(CP) $(LINUX_DIR)/vmlinux $(KERNEL_BUILD_DIR)/debug/
  65         -$(CP) \
  66                 $(STAGING_DIR_ROOT)/lib/modules/$(LINUX_VERSION)/* \
  67                 $(KERNEL_BUILD_DIR)/debug/modules/
  68         $(FIND) $(KERNEL_BUILD_DIR)/debug -type f | $(XARGS) $(KERNEL_CROSS)strip --only-keep-debug
  69         $(TAR) c -C $(KERNEL_BUILD_DIR) debug \
  70                 $(if $(SOURCE_DATE_EPOCH),--mtime="@$(SOURCE_DATE_EPOCH)") \
  71                 | zstd -T0 -f -o $(BIN_DIR)/kernel-debug.tar.zst
  72   endef
  73 endif
  74
  75 ifeq ($(DUMP)$(filter prereq clean refresh update,$(MAKECMDGOALS)),)
  76   ifneq ($(if $(QUILT),,$(CONFIG_AUTOREBUILD)),)
  77     define Kernel/Autoclean
  78       $(PKG_BUILD_DIR)/.dep_files: $(STAMP_PREPARED)
  79       $(call rdep,$(KERNEL_FILE_DEPENDS),$(STAMP_PREPARED),$(PKG_BUILD_DIR)/.dep_files,-x "*/.dep_*")
  80     endef
  81   endif
  82 endif
  83
  84 define BuildKernel
  85   $(if $(QUILT),$(Build/Quilt))
  86   $(if $(LINUX_SITE),$(call Download,kernel))
  87   $(if $(call qstrip,$(CONFIG_KERNEL_GIT_CLONE_URI)),$(call Download,git-kernel))
  88
  89   .NOTPARALLEL:
  90
  91   $(Kernel/Autoclean)
  92   $(STAMP_PREPARED): $(if $(LINUX_SITE),$(DL_DIR)/$(LINUX_SOURCE))
  93         -rm -rf $(KERNEL_BUILD_DIR)
  94         -mkdir -p $(KERNEL_BUILD_DIR)
  95         $(Kernel/Prepare)
  96         touch $$@
  97
  98   $(KERNEL_BUILD_DIR)/symtab.h: FORCE
  99         rm -f $(KERNEL_BUILD_DIR)/symtab.h
 100         touch $(KERNEL_BUILD_DIR)/symtab.h
 101         +$(KERNEL_MAKE) vmlinux
 102         find $(LINUX_DIR) $(STAGING_DIR_ROOT)/lib/modules -name \*.ko | \
 103                 xargs $(TARGET_CROSS)nm | \
 104                 awk '$$$$1 == "U" { print $$$$2 } ' | \
 105                 sort -u > $(KERNEL_BUILD_DIR)/mod_symtab.txt
 106         $(TARGET_CROSS)nm -n $(LINUX_DIR)/vmlinux.o | awk '/^[0-9a-f]+ [rR] __ksymtab_/ {print substr($$$$3,11)}' > $(KERNEL_BUILD_DIR)/kernel_symtab.txt
 107         grep -Ff $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_include.txt
 108         grep -Fvf $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_exclude.txt
 109         ( \
 110                 echo '#define SYMTAB_KEEP \'; \
 111                 cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
 112                         awk '{print "KEEP(*(___ksymtab+" $$$$1 ")) \\" }'; \
 113                 echo; \
 114                 echo '#define SYMTAB_KEEP_GPL \'; \
 115                 cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
 116                         awk '{print "KEEP(*(___ksymtab_gpl+" $$$$1 ")) \\" }'; \
 117                 echo; \
 118                 echo '#define SYMTAB_DISCARD \'; \
 119                 cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
 120                         awk '{print "*(___ksymtab+" $$$$1 ") \\" }'; \
 121                 echo; \
 122                 echo '#define SYMTAB_DISCARD_GPL \'; \
 123                 cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
 124                         awk '{print "*(___ksymtab_gpl+" $$$$1 ") \\" }'; \
 125                 echo; \
 126         ) > $$@
 127
 128   $(STAMP_CONFIGURED): $(STAMP_PREPARED) $(LINUX_KCONFIG_LIST) $(TOPDIR)/.config FORCE
 129         $(Kernel/Configure)
 130         touch $$@
 131
 132   $(LINUX_DIR)/.modules: export STAGING_PREFIX=$$(STAGING_DIR_HOST)
 133   $(LINUX_DIR)/.modules: export PKG_CONFIG_PATH=$$(STAGING_DIR_HOST)/lib/pkgconfig
 134   $(LINUX_DIR)/.modules: export PKG_CONFIG_LIBDIR=$$(STAGING_DIR_HOST)/lib/pkgconfig
 135   $(LINUX_DIR)/.modules: $(STAMP_CONFIGURED) $(LINUX_DIR)/.config FORCE
 136         $(Kernel/CompileModules)
 137         touch $$@
 138
 139   $(LINUX_DIR)/.image: export STAGING_PREFIX=$$(STAGING_DIR_HOST)
 140   $(LINUX_DIR)/.image: export PKG_CONFIG_PATH=$$(STAGING_DIR_HOST)/lib/pkgconfig
 141   $(LINUX_DIR)/.image: export PKG_CONFIG_LIBDIR=$$(STAGING_DIR_HOST)/lib/pkgconfig
 142   $(LINUX_DIR)/.image: $(STAMP_CONFIGURED) $(if $(CONFIG_STRIP_KERNEL_EXPORTS),$(KERNEL_BUILD_DIR)/symtab.h) FORCE
 143         $(Kernel/CompileImage)
 144         $(Kernel/CollectDebug)
 145         touch $$@
 146
 147   mostlyclean: FORCE
 148         $(Kernel/Clean)
 149
 150   define BuildKernel
 151   endef
 152
 153   download: $(if $(LINUX_SITE),$(DL_DIR)/$(LINUX_SOURCE))
 154   prepare: $(STAMP_PREPARED)
 155   compile: $(LINUX_DIR)/.modules
 156         $(MAKE) -C image compile TARGET_BUILD=
 157
 158   oldconfig menuconfig nconfig xconfig: $(STAMP_PREPARED) $(STAMP_CHECKED) FORCE
 159         rm -f $(LINUX_DIR)/.config.prev
 160         rm -f $(STAMP_CONFIGURED)
 161         $(LINUX_RECONF_CMD) > $(LINUX_DIR)/.config
 162         $(_SINGLE)$(KERNEL_MAKE) \
 163                 $(if $(findstring Darwin,$(HOST_OS)), \
 164                         HOST_LOADLIBES="-L$(STAGING_DIR_HOST)/lib -lncurses" \
 165                         HOSTLDLIBS_mconf="-L$(STAGING_DIR_HOST)/lib -lncurses" \
 166                         filechk_conf_cfg="      :" \
 167                 ) \
 168                 YACC=$(STAGING_DIR_HOST)/bin/bison \
 169                 $$@
 170         $(call LINUX_RECONF_DIFF,$(LINUX_DIR)/.config) > $(LINUX_RECONFIG_TARGET)
 171
 172   install: $(LINUX_DIR)/.image
 173         +$(MAKE) -C image compile install TARGET_BUILD=
 174
 175   clean: FORCE
 176         rm -rf $(KERNEL_BUILD_DIR)
 177
 178   image-prereq:
 179         @+$(NO_TRACE_MAKE) -s -C image prereq TARGET_BUILD=
 180
 181   prereq: image-prereq
 182
 183 endef