#
# Makefile for the VirtualBox Linux Host Driver.
# (For 2.6.x this file must be called 'Makefile'!)
#

#
#
# Copyright (C) 2006 InnoTek Systemberatung 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.
#
# If you received this file as part of a commercial VirtualBox
# distribution, then only the terms of your commercial VirtualBox
# license agreement apply instead of the previous paragraph.
#

MODULE = vboxdrv
OBJS   = \
	linux/SUPDrv-linux.o \
	SUPDRVShared.o \
	r0drv/alloc-r0drv.o \
	r0drv/linux/alloc-r0drv-linux.o \
	r0drv/linux/semaphore-r0drv-linux.o \
	r0drv/linux/spinlock-r0drv-linux.o \
	r0drv/linux/thread-r0drv-linux.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
 $(info Info: using $(KERN_INCL) as the include directory of your Linux kernel. If this is not correct, specify KERN_INCL=<directory> and run Make again.)
endif
ifneq ($(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.
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 Error: could not find the module directory for your current Linux kernel)
 endif
endif # MODULE_DIR unspecified

# guess kernel version (24 or 26)
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)
 ifndef KBUILD_EXTMOD
  KBUILD_EXTMOD := $(shell pwd)
 endif
 INCL    += $(addprefix -I$(KBUILD_EXTMOD),/ /include /r0drv/linux)
 export INCL
endif
KFLAGS   := -D__KERNEL__ -DMODULE -D__LINUX__ -DIN_RING0 -DIN_RT_R0 -DIN_SUP_R0
ifndef CONFIG_VBOXDRV_FIXEDMAJOR
 KFLAGS  += -DCONFIG_VBOXDRV_AS_MISC
endif
ifeq ($(filter-out x86_64 amd64 AMD64,$(shell uname -m)),)
 KFLAGS  += -D__AMD64__
else
 KFLAGS  += -D__X86__
endif
#ifeq ($(BUILD_TYPE),debug) - you'll have to enable this manually to get debug stuff.
#KFLAGS   += -DDEBUG
#endif

ifeq ($(KERN_VERSION), 24)
# 2.4
TOPDIR         = $(KERN_DIR)
MODULE_EXT    := o
EXTRA_CFLAGS  := -DVBOX_LINUX_2_4
$(MODULE)-objs = $(OBJS)
else
# 2.6 and later
MODULE_EXT    := ko
$(MODULE)-y   := $(OBJS)
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

ifeq ($(KERN_VERSION), 24)
#
# 2.4 Module linking
#
$(MODULE).o: $(OBJS)
	$(LD) -o $@ -r $(OBJS)

include $(KERN_DIR)/Rules.make

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; \
	rm -f /etc/vbox/module_not_compiled

endif # eq($(MAKECMDGOALS),clean)

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