#
# VirtualBox Guest Additions Module Makefile.
#
# (For 2.6.x this file must be 'Makefile'!)
#
#  Copyright (C) 2006-2007 innotek GmbH
#
#  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 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.
#

#
MODULE = vboxadd
OBJS   = \
	cmc.o \
	hgcmcall.o \
	vboxmod.o \
	GenericRequest.o \
	HGCMInternal.o \
	Init.o \
	PhysHeap.o \
	SysHlp.o \
	VMMDev.o \
	r0drv/alloc-r0drv.o \
	r0drv/linux/alloc-r0drv-linux.o \
	r0drv/linux/semevent-r0drv-linux.o \
	r0drv/linux/semfastmutex-r0drv-linux.o \
	RTErrConvertToErrno.o \
	divdi3.o \
	moddi3.o \
	udivdi3.o \
	umoddi3.o \
	qdivrem.o \
	assert.o \
	logbackdoor.o \
	logformat.o \
	strformat.o \
	strformatrt.o \
	strformat-vbox.o

ifneq ($(MAKECMDGOALS),clean)

# 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 additions 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
# KERN_VERSION := $(if $(wildcard $(KERN_DIR)/Rules.make),24,26)

# 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    := -I$(KERN_INCL) $(addprefix -I, $(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 -DVBGL_VBOXGUEST -DVBOX_HGCM \
	    -DLOG_TO_BACKDOOR -DRT_WITH_VBOX -DIN_MODULE -DIN_GUEST_R0
ifeq ($(BUILD_TYPE),debug)
KFLAGS   += -DDEBUG
endif

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

CFLAGS := -O2 -DVBOX_LINUX_2_4 -DEXPORT_SYMTAB $(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)

# 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 .vboxadd* .tmp_ver* vboxadd.* Module.symvers Modules.symvers