hello world模块

测试环境：fedora 10,devkit8000

 

源代码

#include
#include
MODULE_LICENSE("Dual BSD/GPL");

static int hello_init(void)
{
 printk(KERN_ALERT "Hello, world\n");
 return 0;
}

static void hello_exit(void)
{
 printk(KERN_ALERT "Goodbye, cruel world\n");
}

module_init(hello_init);
module_exit(hello_exit);

 

Makefile如下：

ARCH=arm
CROSS_COMPILE=arm-none-linux-gnueabi-
obj-m := hello.o
#   KERNELDIR ?= /lib/modules/$(shell uname -r)/build
    KERNELDIR ?= /home/omap/linux-2.6.28-omap
    # The current directory is passed to sub-makes as argument
    PWD := $(shell pwd)

modules:   
 $(MAKE) -C $(KERNELDIR) M=$(PWD) modules
 

modules_install:
 $(MAKE) -C $(KERNELDIR) M=$(PWD) modules_install

clean:
 rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions

 

测试环境是arm，如果是在计算机上测试，则要改2个地方：

（1）去掉

ARCH=arm
CROSS_COMPILE=arm-none-linux-gnueabi-

（2）用KERNELDIR ?= /lib/modules/$(shell uname -r)/build替代

      KERNELDIR ?= /home/omap/linux-2.6.28-omap

 

 

编译下

[omap@localhost ldd3]$ sudo make
[sudo] password for omap:
make -C /home/omap/linux-2.6.28-omap M=/mnt/hgfs/linux_share/ldd3 modules
make[1]: Entering directory `/home/omap/linux-2.6.28-omap'
  Building modules, stage 2.
  MODPOST 1 modules
make[1]: Leaving directory `/home/omap/linux-2.6.28-omap'
[omap@localhost ldd3]$

 

测试一下：

[\u\@\h \W]# ls
hello.ko
[\u\@\h \W]# insmod hello.ko
Hello, world
[\u\@\h \W]# rmmod hello
Goodbye, cruel world
rmmod: module 'hello' not found
[\u\@\h \W]#

 

rmmod: module 'hello' not found这句话不需要管，如果要深究的话，改下busybox源程序就可以了。