# checkKenerlOS.mk
# Dennis Yang
# Include this for checking the OS distribution
# Support RedHat, RHEL_AS_30, RHEL_AS_40, SUSE, SUEL_9
# This .mk will parapre these parameters
# $(RUNKVER) $(KERSRC) $(KSRCSYMLINK)
# $(OSDIST) $(KER_INCLUDES) $(VERSION_H) $(CONFIG_H) $(MODPOST)
# Start: 2005/05/12
# Update: 2006/01/26

RUNKVER := $(shell uname -r)
KSRCPATH :=  /lib/modules/$(RUNKVER)/source /lib/modules/$(RUNKVER)/build /usr/src/linux-$(RUNKVER) /usr/src/linux-$(shell echo $(RUNKVER) | sed 's/-.*//') /usr/src/linux-$(shell echo $(RUNKVER) | sed 's/\([0-9]*\.[0-9]*\)\..*/\1/') /usr/src/linux

KERSRC := $(shell for i in $(KSRCPATH) ; do if [ -e $${i}/include/linux ] ; then echo $${i} ; break ; fi ; done)

ifeq ($(KERSRC),)
	$(error Can not find linux kernel source!)
endif

KSRCSYMLINK := $(shell ls -la $(KERSRC)|grep "\->"|sed -e 's/..*-> //')

OSDIST := NONE
GENKSYMS := genksyms
KER_INCLUDES  := -I$(KERSRC)/include
VERSION_H := $(KERSRC)/include/linux/version.h
CONFIG_H := $(KERSRC)/include/linux/config.h

ifneq ($(wildcard /etc/redhat-release),) 
#RedHat
	ISRHEL := $(shell cat /etc/redhat-release|grep "Enterprise Linux")
	ifneq ($(ISRHEL),)
		ifneq ($(wildcard $(KERSRC)/include/linux/rhconfig.h),)
			OSDIST := RHEL_AS_30
		endif
		ifeq ($(OSDIST),NONE)
			ISRHELAS4 := $(shell cat $(KERSRC)/include/linux/compile.h|grep "LINUX_COMPILE_DOMAIN"|grep ".redhat.com")
			ifneq ($(ISRHELAS4),)
				OSDIST := RHEL_AS_40
			endif
		endif
	else
		ifneq ($(wildcard $(KERSRC)/include/linux/rhconfig.h),)
			OSDIST := REDHAT
		endif
	endif
else
	ifneq ($(wildcard /etc/SuSE-release),)
		OSDIST := SUSE
		ISSUEL9 := $(shell cat /etc/SuSE-release|grep "SUSE LINUX Enterprise Server 9")
		ifneq ($(ISSUEL9),)
			OSDIST := SUEL_9
		endif
	endif
endif

#verify OS
ifeq ($(OSDIST),NONE)
	$(error Can not find OS distribution)
endif

# Check CPU section
#ifeq ($(CPU),INTEL)
#	CPU_ARCH = INTEL
#endif
#ifeq ($(CPU),AMD)
#	CPU_ARCH = AMD
#endif

ifneq ($(CPU_ARCH),)
	FORCE_ARCH = 1
else
	ifneq ($(wildcard $(MINCLUDEPATH)/cpuarch.mk),)
		include $(MINCLUDEPATH)/cpuarch.mk
	else
		CPU_ARCH = INTEL
	endif
endif

# For RedHat
ifeq ($(OSDIST),REDHAT)
	#UP
	ifeq ($(KERNEL_CONFIG),1) 
		KDEF_EXT = -D__BOOT_KERNEL_UP=1 -D__BOOT_KERNEL_SMP=0 -D__BOOT_KERNEL_BIGMEM=0 -D__BOOT_KERNEL_ENTERPRISE=0
	endif
	#SMP
	ifeq ($(KERNEL_CONFIG),2)
		KDEF_EXT = -D__BOOT_KERNEL_UP=0 -D__BOOT_KERNEL_SMP=1 -D__BOOT_KERNEL_BIGMEM=0 -D__BOOT_KERNEL_ENTERPRISE=0
	endif
	#Bigmem
	ifeq ($(KERNEL_CONFIG),3)
		KDEF_EXT = -D__BOOT_KERNEL_UP=0 -D__BOOT_KERNEL_SMP=0 -D__BOOT_KERNEL_BIGMEM=1 -D__BOOT_KERNEL_ENTERPRISE=0
	endif

	KER_INCLUDES := -I$(KERSRC)/include
	VERSION_H := $(KERSRC)/include/linux/version.h
	CONFIG_H := $(KERSRC)/include/linux/config.h
endif

#For RHEL AS 30
ifeq ($(OSDIST),RHEL_AS_30)
	KER_INCLUDES := -I$(KERSRC)/include
	VERSION_H := $(KERSRC)/include/linux/version.h
	CONFIG_H := $(KERSRC)/include/linux/config.h
	
	X64BIT := $(shell $(CC) -v 2>&1 | grep "host=x86_64-redhat-linux" )
	ifneq ($(X64BIT),)
		X64 = 1
	else
		X64 = 0
	endif

	ifeq ($(CPU_ARCH),INTEL)
		ifeq ($(X64),1)
			KDEF_EXT_CPU = -D__MODULE_KERNEL_ia32e=1 -D__MODULE_KERNEL_x86_64=0
		else
			KDEF_EXT_CPU = -D__MODULE_KERNEL_athlon=0 -D__MODULE_KERNEL_i686=1
		endif
	endif
	ifeq ($(CPU_ARCH),AMD)
		ifeq ($(X64),1)
			KDEF_EXT_CPU = -D__MODULE_KERNEL_ia32e=0 -D__MODULE_KERNEL_x86_64=1
		else
			KDEF_EXT_CPU = -D__MODULE_KERNEL_athlon=1 -D__MODULE_KERNEL_i686=0
		endif
	endif

	#UP
	ifeq ($(KERNEL_CONFIG),1) 
		KDEF_EXT = $(KDEF_EXT_CPU) -D__BOOT_KERNEL_UP=1 -D__BOOT_KERNEL_SMP=0 -D__BOOT_KERNEL_BIGMEM=0 -D__BOOT_KERNEL_ENTERPRISE=0 -D__BOOT_KERNEL_HUGEMEM=0
	endif
	#SMP
	ifeq ($(KERNEL_CONFIG),2)
		KDEF_EXT = $(KDEF_EXT_CPU) -D__BOOT_KERNEL_UP=0 -D__BOOT_KERNEL_SMP=1 -D__BOOT_KERNEL_BIGMEM=0 -D__BOOT_KERNEL_ENTERPRISE=0 -D__BOOT_KERNEL_HUGEMEM=0
	endif
	#Bigmem
	ifeq ($(KERNEL_CONFIG),3)
		ifneq ($(X64),1)
			KDEF_EXT = $(KDEF_EXT_CPU) -D__BOOT_KERNEL_UP=0 -D__BOOT_KERNEL_SMP=0 -D__BOOT_KERNEL_BIGMEM=1 -D__BOOT_KERNEL_ENTERPRISE=0 -D__BOOT_KERNEL_HUGEMEM=1
		else
			KDEF_EXT = $(KDEF_EXT_CPU) -D__BOOT_KERNEL_UP=0 -D__BOOT_KERNEL_SMP=1 -D__BOOT_KERNEL_BIGMEM=0 -D__BOOT_KERNEL_ENTERPRISE=0 -D__BOOT_KERNEL_HUGEMEM=0
		endif
	endif

	ifeq ($(FORCE_ARCH),1)
		KDEF_EXT += $(KDEF_EXT_CPU)
	endif
endif

#For RHEL AS 40
ifeq ($(OSDIST),RHEL_AS_40)
	X64BIT := $(shell $(CC) -v 2>&1 | grep "host=x86_64-redhat-linux" )
	ifneq ($(X64BIT),)
		X64 = 1
	else
		X64 = 0
	endif

	#UP
	KVBASE=$(shell echo $(RUNKVER)|sed -e 's/hugemem//'|sed -e 's/smp//')
	ifeq ($(KERNEL_CONFIG),1)
		KERSRC := /lib/modules/$(KVBASE)/build
	endif
	#SMP
	ifeq ($(KERNEL_CONFIG),2)
		KERSRC := /lib/modules/$(KVBASE)smp/build
	endif
	#Hugemem
	ifeq ($(KERNEL_CONFIG),3)
		ifeq ($(X64),0)
			KERSRC := /lib/modules/$(KVBASE)hugemem/build
		else
			KERSRC := /lib/modules/$(KVBASE)smp/build
		endif
	endif

	KER_INCLUDES := -I$(KERSRC)/include
	VERSION_H := $(KERSRC)/include/linux/version.h
	CONFIG_H := $(KERSRC)/include/linux/config.h
	MODPOST := $(KERSRC)/scripts/mod/modpost
	GENKSYMS := $(KERSRC)/scripts/genksyms/genksyms
endif

#check SuSE
ifeq ($(OSDIST),SUSE)
	CONFIG_H := $(KERSRC)/include/linux/config.h
	ifneq ($(wildcard $(CONFIG_H)),)
		suse := $(shell $(CC) -E -dM -I$(KERSRC)/include $(CONFIG_H) | grep CONFIG_SUSE_KERNEL | cut -f3 -d' ')
	else
        $(error missing $(CONFIG_H))
	endif

	ifeq ($(suse),1) 
		ifneq ($(KERNEL_CONFIG),0)
			#get suse config path
			VERSION_H := $(KERSRC)/include/linux/version.h
			ifeq ($(wildcard $(VERSION_H)),)
                $(error missing $(VERSION_H))
			endif
			KVER := $(SHELL $(CC) -E -dM $(VERSION_H) | grep UTS_RELEASE | awk '{ print $$3 }' | sed 's/\"//g')
			KMAJORVER := $(shell echo "$(KVER)"|cut -f1 -d'-')

			ifeq ($(KERNEL_CONFIG),1)
				SUSECFG_PATH := $(SUSECFGPATH)/$(KMAJORVER)-4GB
			endif
			ifeq ($(KERNEL_CONFIG),2)
				SUSECFG_PATH := $(SUSECFGPATH)/$(KMAJORVER)-4GB-SMP
			endif
			ifeq ($(KERNEL_CONFIG),3)
				SUSECFG_PATH := $(SUSECFGPATH)/$(KMAJORVER)-64GB-SMP
			endif

			#set up header
			VERSION_H := $(SUSECFG_PATH)/vmlinuz.version.h
			CONFIG_H := $(SUSECFG_PATH)/vmlinuz.autoconf.h

			tmp := $(shell rm -rf ./include; mkdir -p include/linux; cp -af $(VERSION_H) include/linux/version.h; cp -af $(CONFIG_H) include/linux/autoconf.h)
			KER_INCLUDES := -I./include -I$(KERSRC)/include
		else
			VERSION_H := /boot/vmlinuz.version.h
			CONFIG_H := /boot/vmlinuz.autoconf.h
			ifneq ($(wildcard $(VERSION_H)),)
				ifneq ($(wildcard $(CONFIG_H)),)
					KVER := $(shell $(CC) -E -dM $(VERSION_H) | grep UTS_RELEASE | awk '{ print $$3 }' | sed 's/\"//g')
					ifeq ($(KVER),$(RUNKVER))
						tmp := $(shell rm -rf ./include; mkdir -p include/linux; cp -af $(VERSION_H) include/linux/version.h; cp -af $(CONFIG_H) include/linux/autoconf.h)
						KER_INCLUDES := -I./include -I$(KERSRC)/include
                        $(warning $(VERSION_H) and $(CONFIG_H) matched the running kernel, use them as default)
					endif
				endif
			endif
		endif
	else
		$(error This kernel source is not SuSE released!)
	endif
endif

ifeq ($(OSDIST),SUEL_9)
	CONFIG_H := $(KERSRC)/include/linux/autoconf.h
	ifneq ($(wildcard $(CONFIG_H)),)
		suse := $(shell $(CC) -E -dM -I$(KERSRC)/include $(CONFIG_H) | grep CONFIG_SUSE_KERNEL | cut -f3 -d' ')
	else
        $(error missing $(CONFIG_H), need suse kernel source!)
	endif

	KERBUILD := /lib/modules/$(RUNKVER)/build
	ifeq ($(suse),1) 
		ifneq ($(KERNEL_CONFIG),0)
			ifeq ($(KERNEL_CONFIG),1)
				KERBUILD := /usr/src/linux-obj/i386/default
			endif
			ifeq ($(KERNEL_CONFIG),2)
				KERBUILD := /usr/src/linux-obj/i386/smp
			endif
			ifeq ($(KERNEL_CONFIG),3)
				KERBUILD := /usr/src/linux-obj/i386/bigsmp
			endif

			#set up header
			VERSION_H := $(KERBUILD)/include/linux/version.h
			CONFIG_H := $(KERBUILD)/include/linux/autoconf.h

			KER_INCLUDES := -I$(KERBUILD)/include -I$(KERSRC)/include
		else
			VERSION_H := $(KERBUILD)/include/linux/version.h
			CONFIG_H := $(KERBUILD)/include/linux/autoconf.h
			KER_INCLUDES :=
			ifneq ($(wildcard $(VERSION_H)),)
				ifneq ($(wildcard $(CONFIG_H)),)
					KVER := $(shell $(CC) -E -dM $(VERSION_H) | grep UTS_RELEASE | awk '{ print $$3 }' | sed 's/\"//g')
					ifeq ($(KVER),$(RUNKVER))
						KER_INCLUDES := -I$(KERBUILD)/include -I$(KERSRC)/include
                        $(warning $(VERSION_H) and $(CONFIG_H) matched the running kernel, use them as default)
					endif
				endif
			endif
			ifeq ($(KER_INCLUDES),)
                $(error Can not find the kernel include directory for current kernel!)
			endif
		endif

		MODPOST := $(KERBUILD)/scripts/modpost
		GENKSYMS := $(KERBUILD)/scripts/genksyms/genksyms
	else
		$(error This kernel source is not SuSE released!)
	endif
endif


# Test file existence
ifeq ($(wildcard $(CONFIG_H)),)
	$(error missing $(CONFIG_H))
endif

ifeq ($(wildcard $(VERSION_H)),)
	$(error missing $(VERSION_H))
endif

ifneq ($(MODPOST),)
	ifeq ($(wildcard $(MODPOST)),)
		$(error missing $(MODPOST))
	endif
endif

#EOF