# kernel_LIBRARIES .. list of the kernel-space libraries
# rtlinux_LIBRARIES.. list of the RT-Linux kernel-space libraries
# kernel_HEADERS   .. list of the kernel-space public header files
# rtlinux_HEADERS  .. list of the RT-Linux kernel-space public header files
# kernel_MODULES   .. list of the kernel side modules/applications
# rtlinux_MODULES  .. list of RT-Linux the kernel side modules/applications
# kernel_INCLUDES  .. additional include directories and defines for kernel-space
# rtlinux_INCLUDES .. additional include directories and defines for RT-Linux
# OMIT_KERNEL_PASSES  if defined, all kernel passes are omited
# LINUX_DIR        .. location of Linux kernel sources
# RTL_DIR          .. location of RT-Linux sources

KERN_INCLUDE_DIR := $(OUTPUT_DIR)/$(COMPILED_DIR_NAME)/include-kern
KERN_LIB_DIR     := $(OUTPUT_DIR)/$(COMPILED_DIR_NAME)/lib-kern
KERN_MODULES_DIR := $(OUTPUT_DIR)/$(COMPILED_DIR_NAME)/modules
KERN_BUILD_DIR   := $(OUTPUT_DIR)/$(BUILD_DIR_NAME)/kern
KERN_MODPOST_DIR := $(OUTPUT_DIR)/$(BUILD_DIR_NAME)/kern-modpost

ifndef LINUX_VERSION
LINUX_VERSION=$(shell uname -r)
endif
ifndef LINUX_DIR
LINUX_DIR=/lib/modules/$(LINUX_VERSION)/build
endif

KERN_OBJS_DIR = $(KERN_BUILD_DIR)/$(RELATIVE_DIR)

kernel-lib-pass: include-pass
kernel-mod-pass: kernel-lib-pass
kernel-modpost-pass: kernel-mod-pass
kernel-pass: kernel-mod-pass kernel-modpost-pass

#=====================================================================
# Kernel-space rules and templates to compile modules, libraries etc.

ifdef KERN_RULE_TEMPLATES

$(KERN_LIB_DIR)/kernel.mk: $(LINUX_DIR)/.config $(MAKERULES_DIR)/kernelcfg2mk
	@$(QUIET_CMD_ECHO) "  KCFG2MK $@"
	$(Q) $(MAKERULES_DIR)/kernelcfg2mk $(LINUX_DIR) $(KERN_LIB_DIR)

ifeq ($(CONFIG_RTLINUX),y)
include $(RTL_DIR)/rtl.mk

KERN_CC = $(CC)
kern_GCCLIB_DIR=$(shell LANG=C LC_ALL=C LC_MESSAGES=C $(CC) -print-search-dirs | $(SED4OMK) -n -e 's/^install: \(.*\)$$/\1/p' )
INCLUDES := -I $(KERN_INCLUDE_DIR) $(INCLUDE) $(rtlinux_INCLUDES) $(kernel_INCLUDES)
#-DEXPORT_NO_SYMBOLS
c_o_kern_COMPILE = $(KERN_CC) -idirafter $(kern_GCCLIB_DIR)/include $(INCLUDES)  $(CFLAGS) -DOMK_FOR_KERNEL -DEXPORT_SYMTAB -nostdinc
cc_o_kern_COMPILE = $(CXX) $(INCLUDES) $(CXXFLAGS) -DOMK_FOR_KERNEL -DEXPORT_SYMTAB
KERN_EXE_SUFFIX := .o
KERN_ARCH = $(ARCH)
KERN_LD = $(LD)
KERN_AR = $(AR)

else # CONFIG_RTLINUX

include $(KERN_LIB_DIR)/kernel.mk

ifeq ($(LINUX_SRC),)
LINUX_SRC = $(LINUX_DIR)
endif
kernel_INCLUDES += -I $(KERN_INCLUDE_DIR) -I $(LINUX_DIR) -idirafter $(LINUX_SRC)/include/linux

ifdef LINUX_CC
KERN_CC = $(LINUX_CC)
kern_GCCLIB_DIR=$(shell LANG=C LC_ALL=C LC_MESSAGES=C $(LINUX_CC) -print-search-dirs | $(SED4OMK) -n -e 's/^install: \(.*\)$$/\1/p' )
else
KERN_CC = echo KERN_CC not defined - compilation skipped
endif
c_o_kern_COMPILE = $(KERN_CC) $(kernel_INCLUDES) -idirafter $(kern_GCCLIB_DIR)/include $(LINUX_CPPFLAGS) $(LINUX_CFLAGS) $(LINUX_CFLAGS_MODULE) -DOMK_FOR_KERNEL -DEXPORT_SYMTAB -nostdinc
cc_o_kern_COMPILE = $(KERN_CC) $(kernel_INCLUDES) -idirafter $(kern_GCCLIB_DIR)/include $(LINUX_CPPFLAGS) $(LINUX_CFLAGS) $(LINUX_CFLAGS_MODULE) -DOMK_FOR_KERNEL -DEXPORT_SYMTAB
S_o_kern_COMPILE = $(KERN_CC) $(kernel_INCLUDES) -idirafter $(kern_GCCLIB_DIR)/include $(LINUX_CPPFLAGS) $(LINUX_AFLAGS) $(LINUX_AFLAGS_MODULE) -DOMK_FOR_KERNEL -DEXPORT_SYMTAB -nostdinc
KERN_EXE_SUFFIX := $(LINUX_MODULE_EXT)
KERN_LDFLAGS = $(LINUX_LDFLAGS) $(LINUX_LDFLAGS_MODULE)
ifdef LINUX_ARCH
KERN_ARCH = $(LINUX_ARCH)
else
KERN_ARCH = echo KERN_ARCH not defined - skipped
endif
ifdef LINUX_LD
KERN_LD = $(LINUX_LD)
else
KERN_LD = echo KERN_LD  not defined - skipped
endif
ifneq ($(LINUX_AR),)
KERN_AR = $(LINUX_AR)
else
KERN_AR = $(AR)
endif
ifeq ($(LINUX_QUOTE_MODNAME),y)
KERN_MQ=\"
KERN_KBUILD_MODNAME=-D"KBUILD_MODNAME=((THIS_MODULE)!=NULL?(THIS_MODULE)->name:NULL)"
endif
endif # CONFIG_RTLINUX

KERN_LOADLIBES += -L$(KERN_LIB_DIR)

KERN_LOADLIBES += $(rtlinux_LOADLIBES:%=-l%)
KERN_LOADLIBES += $(kernel_LOADLIBES:%=-l%)



# Check GCC version for kernel part of build
ifndef kern_CC_MAJOR_VERSION
kern_CC_MAJOR_VERSION := $(shell $(KERN_CC) -dumpversion | $(SED4OMK) -e 's/\([^.]\)\..*/\1/')
endif
# Prepare suitable define for dependency building
ifeq ($(kern_CC_MAJOR_VERSION),2)
kern_CC_DEPFLAGS = -Wp,-MD,"$@.d.tmp"
else
kern_CC_DEPFLAGS = -MT $@ -MD -MP -MF "$@.d.tmp"
endif

ifeq ($(KERN_EXE_SUFFIX),.ko)
ifeq ($(wildcard $(LINUX_DIR)/scripts/mod/modpost),)
KERN_MODPOST = $(LINUX_DIR)/scripts/modpost
else
KERN_MODPOST = $(LINUX_DIR)/scripts/mod/modpost
endif
KERN_MODULES_LINK_DIR = $(KERN_MODPOST_DIR)
KERN_LINK_SUFFIX = .o
else
KERN_MODULES_LINK_DIR = $(KERN_MODULES_DIR)
KERN_LINK_SUFFIX = $(KERN_EXE_SUFFIX)
endif

ifeq ($(LINUX_CONFIG_MODVERSIONS),y)
MODPOST_OPTS += -m
MODPOST_OPTS += -i $(LINUX_DIR)/Module.symvers
ifneq ($(LINUX_BUILDHOST),) # this is not correct point, it should look for 2.6.17 kernel
MODPOST_OPTS += -I $(KERN_LIB_DIR)/Module.symvers
endif
MODPOST_OPTS += -o $(KERN_LIB_DIR)/Module.symvers
endif

ifeq ($(LINUX_CONFIG_DEBUG_SECTION_MISMATCH),y)
MODPOST_OPTS += -S
endif

ifeq ($(LINUX_CONFIG_MARKERS),y)
MODPOST_OPTS += -K $(LINUX_DIR)/Module.markers
MODPOST_OPTS += -M $(KERN_LIB_DIR)/Module.markers
endif

ifeq ($(LINUX_KBUILD_MODPOST_WARN),y)
MODPOST_OPTS += -w
endif

ifneq ($(LINUX_BUILDHOST),)
ifneq ($(LINUX_BUILDHOST),$(LINUX_ARCH))
MODPOST_OPTS += -c
endif
endif

define COMPILE_c_o_kern_template

$(2): $(1)
	@$(QUIET_CMD_ECHO) "  CC [K]  $$@"
	$(Q) if $$(c_o_kern_COMPILE) $$(kern_CC_DEPFLAGS) $(3) $(KERN_KBUILD_MODNAME) \
	-D"KBUILD_BASENAME=$(KERN_MQ)$(notdir $(basename $(1)))$(KERN_MQ)" \
	-o $$@ -c $$< ; \
	then mv -f "$$@.d.tmp" "$$@.d" ; \
	else rm -f "$$@.d.tmp" ; exit 1; \
	fi
endef



define COMPILE_cc_o_kern_template

$(2): $(1)
	@$(QUIET_CMD_ECHO) "  CXX [K] $$@"
	$(Q) if $$(cc_o_kern_COMPILE) $$(kern_CC_DEPFLAGS) $(3) $(KERN_KBUILD_MODNAME) \
	-D"KBUILD_BASENAME=$(KERN_MQ)$(notdir $(basename $(1)))$(KERN_MQ)" \
	-o $$@ -c $$< ; \
	then mv -f "$$@.d.tmp" "$$@.d" ; \
	else rm -f "$$@.d.tmp" ; exit 1; \
	fi
endef



define COMPILE_S_o_kern_template

$(2): $(1)
	@$(QUIET_CMD_ECHO) "  AS [K]  $$@"
	$(Q) if $$(S_o_kern_COMPILE) $$(kern_CC_DEPFLAGS) $(3) $(KERN_KBUILD_MODNAME) \
	-D"KBUILD_BASENAME=$(KERN_MQ)$(notdir $(basename $(1)))$(KERN_MQ)" \
	-o $$@ -c $$< ; \
	then mv -f "$$@.d.tmp" "$$@.d" ; \
	else rm -f "$$@.d.tmp" ; exit 1; \
	fi
endef



define MODULE_kern_template
$(1)_OBJS += $$(filter %.o,$$($(1)_SOURCES:%.c=%.o))
$(1)_OBJS += $$(filter %.o,$$($(1)_SOURCES:%.cc=%.o))
$(1)_OBJS += $$(filter %.o,$$($(1)_SOURCES:%.cxx=%.o))
$(1)_OBJS += $$(filter %.o,$$($(1)_SOURCES:%.cpp=%.o))
$(1)_OBJS := $$(sort $$($(1)_OBJS))

KERN_OBJS  += $$($(1)_OBJS)
KERN_SOURCES += $$($(1)_SOURCES)

# this is hack to build "__this_module" structure for 2.6.x kernels
# modpost is used for that purpose now

#$(1).mod.c:
#	echo  "\
#	#include <linux/version.h>@\
#	#include <linux/module.h>@\
#	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,5))@\
#	#include <linux/vermagic.h>@\
#	#include <linux/compiler.h>@\
#	@\
#	MODULE_INFO(vermagic, VERMAGIC_STRING);@\
#	@\
#	#undef unix@\
#	struct module __this_module@\
#	__attribute__((section(\".gnu.linkonce.this_module\"))) = {@\
#	 .name = __stringify(KBUILD_MODNAME),@\
#	 .init = init_module,@\
#	#ifdef CONFIG_MODULE_UNLOAD@\
#	 .exit = cleanup_module,@\
#	#endif@\
#	};@\
#	#endif@\
#	" | tr @ \\n >$$@


#$(eval $(call COMPILE_c_o_kern_template,$(1).mod.c,$(1).mod.o,-DKBUILD_MODNAME=$(1)))

$(2)/$(1)$(KERN_LINK_SUFFIX): $$($(1)_OBJS)
	@$(QUIET_CMD_ECHO) "  LD [K]  $$@"
	$(Q) $$(KERN_LD) $$(KERN_LDFLAGS) -r $$($(1)_OBJS) -L$$(kern_GCCLIB_DIR) $$($(1)_LIBS:%=-l%) $$(KERN_LOADLIBES) -Map $(KERN_OBJS_DIR)/$(1).mod.map -o $$@
	@echo "$(2)/$(1)$(KERN_LINK_SUFFIX): \\" >$(KERN_OBJS_DIR)/$(1).mod.d
	@$(SED4OMK) -n -e 's/^LOAD \(.*\)$$$$/  \1  \\/p' $(KERN_OBJS_DIR)/$(1).mod.map  >>$(KERN_OBJS_DIR)/$(1).mod.d
	@echo >>$(KERN_OBJS_DIR)/$(1).mod.d
	@if [ "$(KERN_EXE_SUFFIX)" = ".ko" ] ; then \
	  echo $(1) >>$(KERN_MODPOST_DIR)/module-changes ; \
	  echo $(1) >$(KERN_MODPOST_DIR)/$(1).mod.stamp ; \
	fi

endef



define LIBRARY_kern_template
$(1)_OBJS += $$(filter %.o,$$($(1)_SOURCES:%.c=%.o))
$(1)_OBJS += $$(filter %.o,$$($(1)_SOURCES:%.cc=%.o))
$(1)_OBJS += $$(filter %.o,$$($(1)_SOURCES:%.cxx=%.o))
$(1)_OBJS += $$(filter %.o,$$($(1)_SOURCES:%.cpp=%.o))
$(1)_OBJS := $$(sort $$($(1)_OBJS))

KERN_OBJS  += $$($(1)_OBJS)
KERN_SOURCES += $$($(1)_SOURCES)

$(KERN_LIB_DIR)/lib$(1).a: $$($(1)_OBJS)
	@$(QUIET_CMD_ECHO) "  AR [K]  $$@"
	$(Q) $(KERN_AR) rcs $$@ $$^
endef


ifdef LINUX_DIR

kernel-lib-pass-local: $(kernel_LIBRARIES:%=$(KERN_LIB_DIR)/lib%.a)

kernel-mod-pass-local: $(kernel_MODULES:%=$(KERN_MODULES_LINK_DIR)/%$(KERN_LINK_SUFFIX))

$(foreach module,$(kernel_MODULES),$(eval $(call MODULE_kern_template,$(module),$(KERN_MODULES_LINK_DIR))))

$(foreach lib,$(kernel_LIBRARIES),$(eval $(call LIBRARY_kern_template,$(lib))))

endif


ifeq ($(CONFIG_RTLINUX),y)

kernel-mod-pass-local: $(rtlinux_MODULES:%=$(KERN_MODULES_LINK_DIR)/%$(KERN_LINK_SUFFIX))

kernel-lib-pass-local: $(rtlinux_LIBRARIES:%=$(KERN_LIB_DIR)/lib%.a)

$(foreach module,$(rtlinux_MODULES),$(eval $(call MODULE_kern_template,$(module),$(KERN_MODULES_LINK_DIR))))

$(foreach lib,$(rtlinux_LIBRARIES),$(eval $(call LIBRARY_kern_template,$(lib))))

endif

ifeq ($(KERN_MODPOST_PASS),y)

MODULES_LIST :=	$(wildcard *.mod.stamp)
MODULES_LIST := $(MODULES_LIST:%.mod.stamp=%)

define MODPOST_kern_template
$(2) : $(1)$(KERN_LINK_SUFFIX) $(1).mod.c
	@$(QUIET_CMD_ECHO) "  LD [M]  $$@"
	$(Q) $$(c_o_kern_COMPILE) -D"KBUILD_BASENAME=$(KERN_MQ)$(1)$(KERN_MQ)" \
		-D"KBUILD_MODNAME=$(KERN_MQ)$(1)$(KERN_MQ)" \
		-o $(1).mod.o -c $(1).mod.c
	$(Q) $$(KERN_LD) $$(KERN_LDFLAGS) $(1)$(KERN_LINK_SUFFIX) $(1).mod.o -r -o $$@
endef

kernel-modpost-versions: $(wildcard $(LINUX_DIR)/Module.symvers)
	@$(QUIET_CMD_ECHO) "  MODPOST    $(KERN_MODPOST_DIR)"
	@echo  >$(KERN_MODPOST_DIR)/modpost-running
	@rm -f $(KERN_MODPOST_DIR)/module-changes
	$(Q) $(KERN_MODPOST) $(MODPOST_OPTS) $(MODULES_LIST:%=%$(KERN_LINK_SUFFIX))

$(MODULES_LIST:%=%.mod.c) : kernel-modpost-versions

kernel-modpost-pass-local: $(MODULES_LIST:%=$(KERN_MODULES_DIR)/%$(KERN_EXE_SUFFIX))
	@rm -f $(KERN_MODPOST_DIR)/modpost-running

$(foreach module,$(MODULES_LIST),$(eval $(call MODPOST_kern_template,$(module),$(module:%=$(KERN_MODULES_DIR)/%$(KERN_EXE_SUFFIX)))))

endif

-include $(KERN_OBJS_DIR)/*.d

endif

#=====================================================================

# Kernel requires its own set of configuration header-files
ifneq ($(kernel_LIBRARIES)$(rtlinux_LIBRARIES)$(kernel_MODULES)$(rtlinux_MODULES)$(kernel_HEADERS)$(rtlinux_HEADERS)$(kernel_HEADERS)$(rtlinux_HEADERS)$(nobase_kernel_HEADERS)$(nobase_rtlinux_HEADERS)$(renamed_kernel_HEADERS)$(renamed_rtlinux_HEADERS),)
KERN_CONFIG_HEADERS_REQUIRED = y
endif

$(eval $(call omk_pass_template, kernel-lib-pass,$(KERN_OBJS_DIR),KERN_RULE_TEMPLATES=y,$(kernel_LIBRARIES)$(rtlinux_LIBRARIES)))
$(eval $(call omk_pass_template, kernel-mod-pass,$(KERN_OBJS_DIR),KERN_RULE_TEMPLATES=y,$(kernel_MODULES)$(rtlinux_MODULES)))

kernel-modpost-pass:
	+@if [ -e "$(KERN_MODPOST_DIR)/module-changes" -o -e "$(KERN_MODPOST_DIR)/modpost-running" ] ; \
	then \
	    $(MAKE) --no-print-directory -C $(KERN_MODPOST_DIR) \
	       -f $(SOURCES_DIR)/Makefile KERN_RULE_TEMPLATES=y KERN_MODPOST_PASS=y $(@:%=%-local) ; \
	fi

check-dir::
	@$(call mkdir_def,$(KERN_BUILD_DIR))
	@$(call mkdir_def,$(KERN_INCLUDE_DIR))
	@$(call mkdir_def,$(KERN_LIB_DIR))
	@$(call mkdir_def,$(KERN_MODULES_DIR))
	@$(call mkdir_def,$(KERN_MODPOST_DIR))

$(eval $(call include-pass-template,$(KERN_INCLUDE_DIR),kernel))
ifeq ($(CONFIG_RTLINUX),y)
$(eval $(call include-pass-template,$(KERN_INCLUDE_DIR),rtlinux))
endif

ifdef KERN_RULE_TEMPLATES

KERN_SOURCES := $(sort $(KERN_SOURCES))

#$(warning KERN_SOURCES = $(KERN_SOURCES))

$(foreach src,$(filter %.c,$(KERN_SOURCES)),$(eval $(call COMPILE_c_o_kern_template,$(SOURCES_DIR)/$(src),$(src:%.c=%.o),)))

$(foreach src,$(filter %.cc,$(KERN_SOURCES)),$(eval $(call COMPILE_cc_o_kern_template,$(SOURCES_DIR)/$(src),$(src:%.cc=%.o),)))

$(foreach src,$(filter %.cxx,$(KERN_SOURCES)),$(eval $(call COMPILE_cc_o_kern_template,$(SOURCES_DIR)/$(src),$(src:%.cxx=%.o),)))

$(foreach src,$(filter %.cpp,$(KERN_SOURCES)),$(eval $(call COMPILE_cc_o_kern_template,$(SOURCES_DIR)/$(src),$(src:%.cpp=%.o),)))

$(foreach src,$(filter %.S,$(USER_SOURCES)),$(eval $(call COMPILE_S_o_kern_template,$(SOURCES_DIR)/$(src),$(src:%.S=%.o),)))
endif

clean-local::
	@echo Cleaning in $(KERN_OBJS_DIR)
	@rm -f $(KERN_OBJS_DIR)/*.o \
	       $(KERN_OBJS_DIR)/*.d \
	       $(KERN_OBJS_DIR)/*.map \
	       $(KERN_OBJS_DIR)/*.mod.c \
	       $(kernel_MODULES:%=$(KERN_MODPOST_DIR)/%.*) \
	       $(LOCAL_CONFIG_H:%=$(KERN_OBJS_DIR)/%)
	@if [ -e $(KERN_LIB_DIR)/kernel.mk ] ; then \
	    touch -t 200001010101 $(KERN_LIB_DIR)/kernel.mk ; \
	fi

ifndef OMIT_KERNEL_PASSES
# Also make kernel passes if not disabled
default: kernel-lib-pass kernel-pass
endif