#####################################################################################
#
#   vim: noexpandtab
#
#####################################################################################
# .SILENT:

ifeq ($(KERNEL_LAYOUT),)
# KERNEL_LAYOUT	:= 8mb_26
KERNEL_LAYOUT	:= arm926
endif

##########################################################################################
LINUX_KERNEL_VERSION	:= 2.6.13.1
CP			    := cp
MAKE			:= make
FILESYSTEM		:= filesystem
export INSTALL_MOD_PATH := $(shell echo `pwd`/$(FILESYSTEM))

##########################################################################################
ifeq ($(KERNEL_LAYOUT),arm926)
ARCH			:= arm
CROSS_COMPILE   ?= arm-elf-linux-
else
ARCH			:= mips
CROSS_COMPILE   ?= mipsel-uclibc-linux-
endif


##########################################################################################
SWITCH_KERNEL		?= ../arch/kernel_switch_subproject
SWITCH_KERNEL_PARAM	?= j
SUB_PROJET_LIST     := atm power vinax cpmac emac audio Piglet ahci stick_and_surf ubik2 \
			   		   isdn_fon isdn_fon2 isdn_fon3 isdn_fon4 isdn_fon5 isdn_fon6 flash_update \
			   		   oss_audio avm rfcntl lzma

export PATH		:= $(HOME)/bin/$(KERNEL_LAYOUT)/bin:$(AR7BIN_HOME)/$(KERNEL_LAYOUT)/bin:$(PATH)
KERNEL_BUILD_PARAMS	:= ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE) 
LZMA_LIB		:= kernel/linux-$(LINUX_KERNEL_VERSION)/fs/squashfs/lzma_decode.a

##########################################################################################
all: $(LZMA_LIB)
	$(CP) Config.$(KERNEL_LAYOUT) kernel/linux-$(LINUX_KERNEL_VERSION)/.config
	$(MAKE) -C kernel/linux-$(LINUX_KERNEL_VERSION)  $(KERNEL_BUILD_PARAMS)
	if ! diff -q Config.$(KERNEL_LAYOUT) kernel/linux-$(LINUX_KERNEL_VERSION)/.config ; then \
		LinesDatediff=`diff -au Config.$(KERNEL_LAYOUT) kernel/linux-$(LINUX_KERNEL_VERSION)/.config | grep -e '^[-+]' | grep -v '^---' | grep -v '^+++' | grep -e '[[:digit:]]\+:[[:digit:]][[:digit:]]:[[:digit:]][[:digit:]] [[:digit:]][[:digit:]]' | wc -l`; \
		LinesDiff=`diff -au Config.$(KERNEL_LAYOUT) kernel/linux-$(LINUX_KERNEL_VERSION)/.config | grep -e '^[-+]' | grep -v '^---' | grep -v '^+++'| wc -l`; \
		if [ $$LinesDiff -gt $$LinesDatediff ] ; then \
			$(ECHO) " >> more than a date-diff, updating Config.$(KERNEL_LAYOUT)" ;\
			$(CP) kernel/linux-$(LINUX_KERNEL_VERSION)/.config Config.$(KERNEL_LAYOUT) ; \
		else	\
			$(ECHO) " >> ignoring simple date-diff between 'Config.$(KERNEL_LAYOUT)' and 'kernel/linux-$(LINUX_KERNEL_VERSION)/.config'" ;\
		fi; \
	fi
	
##########################################################################################
menuconfig:
	-$(CP) Config.$(KERNEL_LAYOUT) kernel/linux-$(LINUX_KERNEL_VERSION)/.config
	$(MAKE) -C kernel/linux-$(LINUX_KERNEL_VERSION) $(KERNEL_BUILD_PARAMS) menuconfig 
	$(CP) kernel/linux-$(LINUX_KERNEL_VERSION)/.config Config.$(KERNEL_LAYOUT) 

##########################################################################################
oldconfig:
	$(CP) Config.$(KERNEL_LAYOUT) kernel/linux-$(LINUX_KERNEL_VERSION)/.config
	$(MAKE) -C kernel/linux-$(LINUX_KERNEL_VERSION) $(KERNEL_BUILD_PARAMS) include/linux/autoconf.h
	
##########################################################################################
clean:
	rm -f $(LZMA_LIB)
	$(MAKE) -C kernel/linux-$(LINUX_KERNEL_VERSION)  clean $(KERNEL_BUILD_PARAMS)

##########################################################################################
distclean:
	rm -f $(LZMA_LIB)
	$(MAKE) -C kernel/linux-$(LINUX_KERNEL_VERSION)  distclean $(KERNEL_BUILD_PARAMS)

##########################################################################################
lieferung:
	$(MAKE) external_URLs
	$(MAKE) clean
	$(MAKE) all
	$(MAKE) install

##########################################################################################
external_URLs: 
ifneq ($(NO_SVN),1)
	for i in $(SUB_PROJET_LIST) ; do \
		sh  $(SWITCH_KERNEL) $$i `pwd`/kernel/linux-$(LINUX_KERNEL_VERSION) $(KERNEL_LAYOUT) $(SWITCH_KERNEL_PARAM) || exit 1 ; \
	done
endif
   
##########################################################################################
svn_status:
ifneq ($(NO_SVN),1)
	svn status -qu .
	for i in $(SUB_PROJET_LIST) ; do \
		sh  $(SWITCH_KERNEL) $$i `pwd`/kernel/linux-$(LINUX_KERNEL_VERSION) $(KERNEL_LAYOUT) status || exit 1 ; \
	done
endif

##########################################################################################
$(LZMA_LIB):
ifeq ($(KERNEL_LAYOUT),arm926)
	$(MAKE) -C lzma lzma_decode.a CROSS_COMPILE=$(CROSS_COMPILE) \
		USE_CFLAGS="-D__KERNEL__ -Wall -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing \
		   -fno-common -ffreestanding -falign-functions=4  -falign-labels=4 -falign-loops=4  -falign-jumps=4 \
		   -fomit-frame-pointer -g 0 -fno-pic -finline-limit=100000 -Wa, -mthumb -mthumb-interwork -mapcs-32 -mlittle-endian\
		   "

else
	$(MAKE) -C lzma lzma_decode.a CROSS_COMPILE=$(CROSS_COMPILE) \
		USE_CFLAGS="-D__KERNEL__ -Wall -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing \
		   -fno-common -ffreestanding -falign-functions=4  -falign-labels=4 -falign-loops=4  -falign-jumps=4 \
		   -fomit-frame-pointer -g -G 0 -mno-abicalls -fno-pic -finline-limit=100000 -mabi=32 -march=mips32 -Wa,-32 \
		   -Wa,-march=mips32 -Wa,-mips32 -Wa,--trap"

	cp lzma/lzma_decode.a $@ 
endif

##########################################################################################
kernel.version.h:

##########################################################################################
install: update_h_files
	$(MAKE) -C kernel/linux-$(LINUX_KERNEL_VERSION)  $(KERNEL_BUILD_PARAMS) modules_install
	$(CROSS_COMPILE)objcopy -S -O binary kernel/linux-$(LINUX_KERNEL_VERSION)/vmlinux vmlinux; \
	rm -f lha.options
	echo -e "-l \c" >>lha.options
	grep 'A _text' kernel/linux-$(LINUX_KERNEL_VERSION)/System.map | sed -e's/\(.*\) A .*/0x\1/g' | tr '\n' ' ' >>lha.options
	echo -e "-e \c" >>lha.options
	grep 'T kernel_entry' kernel/linux-$(LINUX_KERNEL_VERSION)/System.map | sed -e's/\(.*\) T .*/0x\1/g' | tr '\n' ' ' >>lha.options

	echo 'MODUL_NAME=_$(KERNEL_LAYOUT)_kernel' >>kernel.version.h
	echo 'DESCRIPTION=Kernel for $(KERNEL_LAYOUT)' >>kernel.version.h
	echo 'VERSION=$(KERNEL_VERSION)' >>kernel.version.h
	echo "DATE=`date +\"%d.%m.%Y-%X\"`" >>kernel.version.h
	tar czpf kernel.$(KERNEL_LAYOUT).`echo $(KERNEL_VERSION) | tr ':' '-'`.tar.gz vmlinux lha.options ./filesystem kernel.version.h
	find . -name 'kernel.*.tar.gz' -mtime +7 -maxdepth 1 -exec rm {} \;
	rm -f kernel.version.h

	rm -f install 
	echo '#! /bin/sh' >>install
	echo 'echo "########################################################################"' >>install
	echo 'echo "#"' >>install
	echo "echo \"#	Install script for $(KERNEL_LAYOUT)\"" >>install
	echo 'echo "#"' >>install
	echo 'echo "########################################################################"' >>install
	echo 'rm -rf kernel.install' >>install
	echo 'mkdir kernel.install' >>install
	echo 'cd kernel.install' >>install
	echo 'if [ "$${install_path}" = "" ] ; then' >>install
	echo '    install_path=.' >>install
	echo 'fi' >>install
	echo 'if [ "$${filesystem}" = "" ] ; then' >>install
	echo '    filesystem=filesystem' >>install
	echo 'fi' >>install
	echo "echo unpack archive \"kernel.$(KERNEL_LAYOUT).$(KERNEL_VERSION).tar.gz\" ..." >>install
	echo "tar xzf ../kernel.$(KERNEL_LAYOUT).`echo $(KERNEL_VERSION) | tr ':' '-'`.tar.gz" >>install

	echo -e "source_files=\"\c" >>install
	find ./filesystem/lib/modules ./filesystem/include | sed -e 's/\(.*\)$$/	\1\\/g' >>install
	echo -e "\"" >>install

#	echo -e 'find ../$${install_path}/$${filesystem}/lib/modules/$(LINUX_KERNEL_VERSION)-ohio -name \x27*.ko\x27 -exec rm -f {} \;' >>install
	echo 'for i in $${source_files} ; do ' >>install
	echo '	destfile=`echo $$i | sed -e "s/.*modules\/\(.*\)/$${filesystem}\/lib\/modules\/\1/g"`' >>install
	echo '	rm -f ../$${install_path}/destfile' >>install
	echo '	if [ ! -d ../$${install_path}/`dirname $${destfile}` ] ; then' >>install
	echo '		echo create "`dirname $${destfile}`" ...' >>install
	echo '		mkdir -p ../$${install_path}/`dirname $${destfile}`' >>install
	echo '	fi' >>install
	echo '	echo install "$${destfile}"' >>install
	echo '	install --mode=444 $$i ../$${install_path}/$${destfile}' >>install
	echo 'done' >>install

#	echo 'rm -f ../$${install_path}/image/kernel.image ../$${install_path}/image/kernel.image.urlader' >>install

#	echo 'echo install "image/kernel.image"' >>install
#	echo 'install --mode=444 kernel.image ../$${install_path}/image' >>install

#	echo 'echo install "image/kernel.image.urlader"' >>install
#	echo 'install --mode=444 kernel.image.urlader ../$${install_path}/image' >>install

	echo 'echo install "kernel.version.h"' >>install
	echo 'install --mode=444 kernel.version.h ../$${filesystem_path}/.version' >>install

	echo 'echo install done' >>install
	chmod +x install
	cp kernel/linux-$(LINUX_KERNEL_VERSION)/System.map .

#---------------------------------------------------------------------------
#---------------------------------------------------------------------------
update_h_files:
	if [ `id -n -u` = ar7bin ] ; then \
		  make .update_h_files || exit 1 ; \
	fi
	
#---------------------------------------------------------------------------
#---------------------------------------------------------------------------
.update_h_files:
	echo "update h files in compiler path ..." ; \
	rm -rf $(AR7BIN_HOME)/$(KERNEL_LAYOUT)/include/asm
	rm -rf $(AR7BIN_HOME)/$(KERNEL_LAYOUT)/include/linux

	target_home=`pwd` ; \
	( cd $$target_home/kernel/linux-$(LINUX_KERNEL_VERSION)/include && \
	  tar --create --gzip --file=$$target_home/h-files.tar.gz --exclude '.svn*' --exclude 'route.h' . && \
	  cd $(AR7BIN_HOME)/$(KERNEL_LAYOUT)/include && \
	  tar --extract --gunzip --file=$$target_home/h-files.tar.gz \
	) ; \
	rm -f $$target_home/h-files.tar.gz 

.PHONY: install kernel.version.h lieferung distclean clean menuconfig all