#
# VirtualBox Guest Additions Module Makefile.
#
# (For 2.6.x this file must be 'Makefile'!)
#
# Copyright (C) 2006-2007 Sun Microsystems, Inc.
#
# This file is part of VirtualBox Open Source Edition (OSE), as
# available from http://www.virtualbox.org. This file is free software;
# you can redistribute it and/or modify it under the terms of the GNU
# General Public License (GPL) as published by the Free Software
# Foundation, in version 2 as it comes in the "COPYING" file of the
# VirtualBox OSE distribution. VirtualBox OSE is distributed in the
# hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
#
# Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
# Clara, CA 95054 USA or visit http://www.sun.com if you need
# additional information or have any questions.
#

# override is required by the Debian guys
override MODULE = vboxvfs
OBJS   = \
	vfsmod.o \
	dirops.o \
	regops.o \
	utils.o \
	GenericRequest.o \
	SysHlp.o \
	PhysHeap.o \
	Init.o \
	VMMDev.o \
	HGCM.o \
	VBoxCalls.o \
	r0drv/alloc-r0drv.o \
	r0drv/linux/alloc-r0drv-linux.o \
	r0drv/linux/semevent-r0drv-linux.o \
	r0drv/linux/semfastmutex-r0drv-linux.o \
	divdi3.o \
	moddi3.o \
	udivdi3.o \
	umoddi3.o \
	qdivrem.o


EXTRA_CFLAGS = -fshort-wchar

ifneq ($(MAKECMDGOALS),clean)

ifeq ($(KERNELRELEASE),)

 #
 # building from this directory
 #

 # kernel base directory
 ifndef KERN_DIR
  KERN_DIR := /lib/modules/$(shell uname -r)/build
  ifneq ($(shell if test -d $(KERN_DIR); then echo yes; fi),yes)
   KERN_DIR := /usr/src/linux
   ifneq ($(shell if test -d $(KERN_DIR); then echo yes; fi),yes)
    $(error Error: unable to find the sources of your current Linux kernel. \
	           Specify KERN_DIR=<directory> and run Make again)
   endif
   $(warning Warning: using /usr/src/linux as the source directory of your \
                      Linux kernel. If this is not correct, specify \
		      KERN_DIR=<directory> and run Make again.)
  endif
 else
  ifneq ($(shell if test -d $(KERN_DIR); then echo yes; fi),yes)
   $(error Error: KERN_DIR does not point to a directory)
  endif
 endif

 # includes
 ifndef KERN_INCL
  KERN_INCL = $(KERN_DIR)/include
 endif
 ifneq ($(shell if test -d $(KERN_INCL); then echo yes; fi),yes)
  $(error Error: unable to find the include directory for your current Linux \
                 kernel. Specify KERN_INCL=<directory> and run Make again)
 endif

 # module install dir.
 ifneq ($(filter install install_rpm,$(MAKECMDGOALS)),)
  ifndef MODULE_DIR
   MODULE_DIR_TST := /lib/modules/$(shell uname -r)
   ifeq ($(shell if test -d $(MODULE_DIR_TST); then echo yes; fi),yes)
    MODULE_DIR := $(MODULE_DIR_TST)/misc
   else
    $(error Unable to find the folder to install the shared folders driver to)
   endif
  endif # MODULE_DIR unspecified
 endif

 # guess kernel version (24 or 26)
 ifeq ($(shell if grep '"2\.4\.' $(KERN_INCL)/linux/version.h > /dev/null; then echo yes; fi),yes)
  KERN_VERSION := 24
 else
  KERN_VERSION := 26
 endif

else # neq($(KERNELRELEASE),)

 #
 # building from kbuild (make -C <kernel_directory> M=`pwd`)
 #

 # guess kernel version (24 or 26)
 ifeq ($(shell if grep '"2\.4\.' $(PWD)/include/linux/version.h > /dev/null; then echo yes; fi),yes)
  KERN_VERSION := 24
 else
  KERN_VERSION := 26
 endif

endif # neq($(KERNELRELEASE),)

# debug - show guesses.
ifdef DEBUG
$(warning dbg: KERN_DIR     = $(KERN_DIR))
$(warning dbg: KERN_INCL    = $(KERN_INCL))
$(warning dbg: MODULE_DIR   = $(MODULE_DIR))
$(warning dbg: KERN_VERSION = $(KERN_VERSION))
endif


#
# Compiler options
#
ifndef INCL
 INCL    := $(addprefix -I,$(KERN_INCL) $(EXTRA_INCL))
 ifndef KBUILD_EXTMOD
  KBUILD_EXTMOD := $(shell pwd)
 endif
 INCL    += $(addprefix -I$(KBUILD_EXTMOD),/ /include /r0drv/linux)
 export INCL
endif
KFLAGS   := -D__KERNEL__ -DMODULE -DRT_OS_LINUX -DIN_RING0 -D_X86_ -DIN_RT_R0 \
	    -DIN_SUP_R0 -DVBOX -DVBOX_HGCM -DLOG_TO_BACKDOOR -DIN_MODULE \
	    -DIN_GUEST_R0
ifeq ($(BUILD_TYPE),debug)
KFLAGS   += -DDEBUG
endif

ifeq ($(KERN_VERSION), 24)
#
# 2.4
#

CFLAGS := -O2 -DVBOX_LINUX_2_4 $(INCL) $(KFLAGS) $(KDEBUG)
MODULE_EXT := o

# 2.4 Module linking
$(MODULE).o: $(OBJS)
	$(LD) -o $@ -r $(OBJS)

.PHONY: $(MODULE)
all: $(MODULE)
$(MODULE): $(MODULE).o

else
#
# 2.6 and later
#

MODULE_EXT := ko

$(MODULE)-y  := $(OBJS)

# special hack for FC6 2.6.18 and rhel5 2.6.18
ifeq ($(KERNELRELEASE),)
 KFLAGS += $(foreach inc,$(KERN_INCL),\
             $(if $(wildcard $(inc)/linux/utsrelease.h),\
               $(if $(shell if grep -q '"2.6.18.*fc6.*"' $(inc)/linux/utsrelease.h;\
                 then echo yes; fi),-DKERNEL_FC6,),) \
             $(if $(wildcard $(inc)/linux/utsrelease.h),\
               $(if $(shell if grep -q '"2.6.18.*el5.*"' $(inc)/linux/utsrelease.h;\
                 then echo yes; fi),-DKERNEL_FC6,),))
else
 KFLAGS += $(filter -DKERNEL_FC6,$(patsubst 2.6.18%fc6,-DKERNEL_FC6,$(KERNELRELEASE)) \
                                 $(patsubst 2.6.18%el5,-DKERNEL_FC6,$(KERNELRELEASE)))
endif

# build defs
EXTRA_CFLAGS += $(INCL) $(KFLAGS) $(KDEBUG)

all: $(MODULE)

obj-m += $(MODULE).o

$(MODULE):
	$(MAKE) KBUILD_VERBOSE=1 -C $(KERN_DIR) SUBDIRS=$(CURDIR) SRCROOT=$(CURDIR) modules

endif

install: $(MODULE)
	@mkdir -p $(MODULE_DIR); \
	install -m 0664 -o root -g root $(MODULE).$(MODULE_EXT) $(MODULE_DIR); \
	PATH="$(PATH):/bin:/sbin" depmod -ae;

endif # eq($(MAKECMDGOALS),clean)

clean:
	for f in . linux r0drv r0drv/linux; do rm -f $$f/*.o $$f/.*.cmd $$f/.*.flags; done
	rm -rf .vboxvfs* .tmp_ver* vboxvfs.* Module.symvers Modules.symvers