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# -*-makefile-*-
#
# This file is part of the sample code for the book "Linux Device Drivers",
# second edition. It is meant to be generic and is designed to be recycled
# by other drivers. The comments should be clear enough.
# It partly comes from Linux Makefile, and needs GNU make. <rubini@xxxxxxxx>
# TOPDIR is declared by the Makefile including this file.
ifndef TOPDIR
TOPDIR = .
endif
# KERNELDIR can be speficied on the command line or environment
ifndef KERNELDIR
KERNELDIR = /usr/src/linux-2.4
endif
# The headers are taken from the kernel
INCLUDEDIR = $(KERNELDIR)/include
# We need the configuration file, for CONFIG_SMP and possibly other stuff
# (especiall for RISC platforms, where CFLAGS depends on the exact
# processor being used).
ifeq ($(KERNELDIR)/.config,$(wildcard $(KERNELDIR))/.config)
include $(KERNELDIR)/.config
else
MESSAGE := $(shell echo "WARNING: no .config file in $(KERNELDIR)")
endif
# ARCH can be speficed on the comdline or env. too, and defaults to this arch
# Unfortunately, we can't easily extract if from kernel configuration
# (well, we could look athe asm- symlink... don't know if worth the effort)
ifndef ARCH
ARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
-e s/arm.*/arm/ -e s/sa110/arm/)
endif
# This is useful if cross-compiling. Taken from kernel Makefile (CC changed)
AS =$(CROSS_COMPILE)as
LD =$(CROSS_COMPILE)ld
CC =$(CROSS_COMPILE)gcc
CPP =$(CC) -E
AR =$(CROSS_COMPILE)ar
NM =$(CROSS_COMPILE)nm
STRIP =$(CROSS_COMPILE)strip
OBJCOPY =$(CROSS_COMPILE)objcopy
OBJDUMP =$(CROSS_COMPILE)objdump
# The platform-specific Makefiles include portability nightmares.
# Some platforms, though, don't have one, so check for existence first
ARCHMAKEFILE = $(TOPDIR)/Makefile.$(ARCH)
ifeq ($(ARCHMAKEFILE),$(wildcard $(ARCHMAKEFILE)))
include $(ARCHMAKEFILE)
endif
# CFLAGS: all assignments to CFLAGS are inclremental, so you can specify
# the initial flags on the command line or environment, if needed.
CFLAGS += -Wall -D__KERNEL__ -DMODULE -I$(INCLUDEDIR)
ifdef CONFIG_SMP
CFLAGS += -D__SMP__ -DSMP
endif
# Prepend modversions.h if we're running with versioning.
ifdef CONFIG_MODVERSIONS
CFLAGS += -DMODVERSIONS -include $(KERNELDIR)/include/linux/modversions.h
endif
#Install dir
VERSIONFILE = $(INCLUDEDIR)/linux/version.h
VERSION = $(shell awk -F\" '/REL/ {print $$2}' $(VERSIONFILE))
INSTALLDIR = /lib/modules/$(VERSION)/misc
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