Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

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+======  Kernel Module for 2.6  ======
+=====  With Normal Makefile  =====
+The hello world program. With normal Makefile, the Makefile:
+<code>
+ARCH		:= i386
+CROSS_COMPILE	:=
+#CROSS_COMPILE	:= ppc_6xxx-
+INSTALL		:= install -c
+INSTALL_DATA	:= $(INSTALL) -m 644
+KERNELVERSION	:= $(shell uname -r)
+# KERNELVERSION	:= 2.6.16-mpc52xx-gc92bc8e3
+EXTRA_CFLAGS 	:= -g -I/usr/realtime/include -I/usr/include/ -ffast-math -mhard-float
+KDIR		:= /lib/modules/$(KERNELVERSION)/build
+PWD		:= $(shell pwd)
+obj-m		:= hello_world.o
+all:
+	$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE)
+#	gcc -o scope scope.c
+clean:
+	rm -f *.o *.ko *.mod.o *.mod.c .*.{cmd,flags} Modules.symvers
+	rm -rf config.status config.log autom4te*.cache .tmp_versions
+</code>
+The hello_world.c:
+<code>
+#include <linux/module.h>
+#include <asm/io.h>
+#include <rtai.h>
+#include <rtai_sched.h>
+#include <rtai_fifos.h>
+MODULE_LICENSE("GPL");
+int init_module(void)
+{
+   printk("in init_module\n");
+   return 0;
+}
+void cleanup_module(void)
+{
+   printk("in cleanup_module\n");
+   return;
+}
+</code>
+=====  With Automake and Autoconf  =====
+create the directory structure:
+<code>
+mkdir test
+cd test
+mkdir src
+mkdir m4
+touch NEWS
+touch README
+touch AUTHORS
+touch ChangeLog
+</code>
+Now we create the Makefile.am:
+<code>
+ACLOCAL_AMFLAGS = -I m4
+SUBDIRS = src
+EXTRA_DIST = autogen.sh
+</code>
+  *  ACLOCAL_AMFLAGS says aclocal where to look for additional m4 macros
+  *  SUBDIRS are processed
+  *  EXTRA_DIST says to include the autogen.sh in our distribution tar
+Now we create a m4 script to get the kernel-source named m4/acinclude.m4:
+<code>
+dnl check for kernel source
+AC_DEFUN([AC_PATH_KERNEL_SOURCE_SEARCH],
+[
+  kerneldir=missing
+  kernelext=ko
+  no_kernel=yes
+  if test `uname` != "Linux"; then
+    kerneldir="not running Linux"
+  else
+    for dir in /usr/src/kernel-source-`uname -r` /usr/src/linux-`uname -r` /usr/src/linux /lib/modules/`uname -r`/build ${ac_kerneldir}; do
+      if test -d $dir; then
+        kerneldir=`dirname $dir/Makefile`/
+        no_kernel=no
+      fi;
+    done
+  fi
+  if test x${no_kernel} != xyes; then
+    if test -f ${kerneldir}/Makefile; then
+      if test "${ac_pkss_mktemp}" = "yes"; then
+        ac_pkss_makefile=`mktemp /tmp/LIRCMF.XXXXXX`
+      else
+        ac_pkss_makefile=/tmp/LIRCMF.XXXXXX
+      fi
+      cat ${kerneldir}/Makefile >${ac_pkss_makefile}
+      echo "lirc_tell_me_what_cc_is:" >>${ac_pkss_makefile}
+      echo "	echo \$(CC)" >>${ac_pkss_makefile}
+      kernelcc=`make -s -C ${kerneldir} -f ${ac_pkss_makefile} lirc_tell_me_what_cc_is`
+      echo "lirc_tell_me_what_version_is:" >>${ac_pkss_makefile}
+      echo "	echo \$(VERSION)" >>${ac_pkss_makefile}
+      echo "lirc_tell_me_what_patchlevel_is:" >>${ac_pkss_makefile}
+      echo "	echo \$(PATCHLEVEL)" >>${ac_pkss_makefile}
+      version=`make -s -C ${kerneldir} -f ${ac_pkss_makefile} lirc_tell_me_what_version_is`
+      patchlevel=`make -s -C ${kerneldir} -f ${ac_pkss_makefile} lirc_tell_me_what_patchlevel_is`
+      if test ${version} -eq 2; then
+        if test ${patchlevel} -lt 5; then
+          kernelext=o
+        fi
+      fi
+      rm -f ${ac_pkss_makefile}
+    else
+      kerneldir="no Makefile found"
+      no_kernel=yes
+    fi
+  fi
+  ac_cv_have_kernel="no_kernel=${no_kernel} \
+		kerneldir=\"${kerneldir}\" \
+		kernelext=\"${kernelext}\" \
+		kernelcc=\"${kernelcc}\""
+]
+)
+AC_DEFUN([AC_PATH_KERNEL_SOURCE],
+[
+  AC_CHECK_PROG(ac_pkss_mktemp,mktemp,yes,no)
+  AC_PROVIDE([AC_PATH_KERNEL_SOURCE])
+  AC_MSG_CHECKING(for Linux kernel sources)
+  AC_ARG_WITH(kerneldir,
+    [  --with-kerneldir=DIR    kernel sources in DIR],
+    ac_kerneldir=${withval}
+    AC_PATH_KERNEL_SOURCE_SEARCH,
+    ac_kerneldir=""
+    AC_CACHE_VAL(ac_cv_have_kernel,AC_PATH_KERNEL_SOURCE_SEARCH)
+  )
+  eval "$ac_cv_have_kernel"
+  AC_SUBST(kerneldir)
+  AC_SUBST(kernelcc)
+  AC_SUBST(kernelext)
+  AC_MSG_RESULT(${kerneldir})
+]
+)
+</code>
+Create now the file configure.ac:
+<code>
+dnl Proccess this file with autoconf to produce a configure script.
+AC_INIT(hello_world, 0.1)
+AC_PREREQ(2.5)
+AC_CONFIG_SRCDIR(src/hello_world.c)
+AC_CONFIG_AUX_DIR(config)
+AM_INIT_AUTOMAKE(1.8)
+dnl Checks for programms
+AC_PROG_CC
+AC_PATH_KERNEL_SOURCE
+default_moduledir=/lib/modules/`uname -r`/misc
+AC_ARG_WITH(moduledir,
+[  --with-moduledir=DIR    kernel modules in DIR (/lib/modules/`uname -r`/misc)],
+moduledir=${withval},
+moduledir=${default_moduledir})
+AC_SUBST(moduledir)
+AC_OUTPUT(Makefile src/Makefile)
+</code>
+  *  AC_INIT init the file with project name, version and email address
+  *  AC_CONFIG_AUX_DIR says autoconf to store tmp file in the dir config to keep the main dir clean
+  *  AC_CONFIG_SRCDIR where is the program to compile
+  *  AM_INIT_AUTOMAKE directive to generate the Makefile
+  *  AC_PROC_CC check for gcc
+  *  AC_OUTPUT generate the following files from the *.in or *.am files
+Now generate the src/Makefile.am:
+<code>
+EXTRA_DIST = Makefile.kernel Makefile.common
+EXTRA_PROGRAMS = automake_dummy
+automake_dummy_SOURCES = hello_world.c
+module_DATA = hello_world.o
+include ./Makefile.common
+</code>
+  *  "PROGRAMS" is called a primary. Other primaries include:
+    *  LIBRARIES for static libraries (.a)
+    *  LTLIBRARIES for Libtool-based shared libraries (.la)
+    *  HEADERS
+    *  ...
+  *  The prefix "bin_" tells Automake where to copy the resulting program when the user runs make install. Known directory prefixes include:
+    *  bin_ - for programs, e.g., /usr/local/bin
+    *  lib_ - where libraries are placed, e.g., /usr/local/lib
+    *  include_ - where header files are placed, e.g., /usr/local/include
+    *  pkginclude_ - e.g., /usr/local/include/foobar
+    *  noinst_ - files that will not be copied anywhere by make install
+    *  ...
+<code>
+      Note: The user can specify the locations of these directories when running the configure script. For more info, run configure --help.</code>
+  *  "SOURCES" is a variable that lists the source files of the program. For programs and libraries, possible variables include:
+    *  CFLAGS, CPPFLAGS, CXXFLAGS - extra arguments passed to the compiler/preprocessor
+    *  LIBADD - extra objects for a library
+    *  LDADD - extra objects for a program
+    *  LDFLAGS - extra arguments passed to the linker
+    *  ...
+Create the Makefile.common:
+<code>
+KERNEL_LOCATION=@kerneldir@
+KBUILD_VERBOSE = 1
+ARCH		:= i386
+CROSS_COMPILE	:=
+#CROSS_COMPILE	:= ppc_6xxx-
+#KERNELVERSION	:= $(shell uname -r)
+# KERNELVERSION	:= 2.6.16-mpc52xx-gc92bc8e3
+HELLO_WORLD_EXTRA_CFLAGS = -g -I/usr/realtime/include -I/usr/include/ -ffast-math -mhard-float
+PWD		:= $(shell pwd)
+export HELLO_WORLD_EXTRA_CFLAGS module_DATA
+$(module_DATA): $(automake_dummy_SOURCES)
+	mv Makefile Makefile.automake
+	cp Makefile.kernel Makefile
+	$(MAKE) -C $(KERNEL_LOCATION) SUBDIRS=$(PWD) modules \
+		KBUILD_VERBOSE=$(KBUILD_VERBOSE) ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE)
+	mv Makefile.automake Makefile
+CLEANFILES = $(module_DATA) .$(module_DATA).{cmd,flags} .$(module_DATA:.o=.@kernelext@).cmd \
+	$(module_DATA:.o=.mod.c) .$(module_DATA:.o=.mod.o.cmd) $(module_DATA:.o=.@kernelext@) \
+	Modules.symvers *~
+clean:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+	rm -rf .tmp_versions
+</code>
+Create Makefile.kernel:
+<code>
+EXTRA_CFLAGS += $(HELLO_WORLD_EXTRA_CFLAGS)
+obj-m=$(module_DATA)
+MI_OBJS = $(module_DATA)
+all clean:
+	$(warning **************************************************)
+	$(warning *** Makefile trick not undone, trying to recover *)
+	$(warning **************************************************)
+	mv Makefile.automake Makefile
+	$(MAKE) $@
+# The following is needed for 2.5 kernels and also let's the makefile work
+# when things get screwed.
+ifneq (,$(wildcard $(KERNEL_LOCATION)/Rules.make))
+include $(KERNEL_LOCATION)/Rules.make
+endif
+</code>

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