Ubuntu下轻松建立你的内核驱动开发环境 tonychen123

本网站用的阿里云ECS,推荐大家用。自己搞个学习研究也不错
Preface:
1.笔者刚学Linux驱动开发,看到网上很多说要现建立内核树。在笔者到官网下载源码时,源码下面有如下说明: If you are simply trying to build third-party modules for your kernel, you do not want this package. Install the appropriate Linux-headers package instead. 意思是,如果你只是想为内核编译第三方的模块,那么,你不需下载此源码包。安装内核头文件包或许会更适合你。

2.如果你的Ubuntu是保持更新的,你的系统是安装有内核头文件包的,不信你到/usr/src目录下查看,是不是有Linux-headers-2.6.xx-xx-generic的文件夹呢,呵呵。我现在可以说,你可以在此开发你的驱动程序了。

3.笔者也是初学,有见笑的,大家多指正

emial: tonychen123@qq.com; 转载注明出处:http://sites.google.com/site/tonychen123site,作者:tony

4.环境本来就有了看来,所以我的文章,本来应该叫驱动开发最简单例子才合适……另,我要示例的是最简单,也是个最没用的驱动演示,名字叫tst,包含源码tst.c及makefile文件,www.Linuxidc.com编译出来的模块名叫tst.ko

Content:

1)建立你的实验目录并创建tst.c源文件:

代码:
tony@Ubuntu:~/mini2440$ mkdir mtst; cd mtst
tony@Ubuntu:~/mini2440/mtst$ vim tst.c

======================================

 

#include   
#include   
#include     

static int __init tst_start(viod)
{
    printk(KERN_INFO “Loading my so simple module…\n”);
    printk(KERN_INFO “I love Ubuntu\n”);
    return 0;
}

static void __exit tst_end(void)
{
    printk(KERN_INFO “From tst module: Goodbye, Tony.\n”);
}

module_init(tst_start);
module_exit(tst_end);

 

 

2)创建Makefile文件:

代码:
tony@Ubuntu:~/mini2440/mtst$ vim Makefile
=================================================================
obj-m = tst.o

K_DIR = $(shell uname -r)
PWD = $(shell pwd)

all:
    make -C /lib/modules/$(K_DIR)/build M=$(PWD) modules
clean:
    make -C /lib/modules/$(K_DIR)/build M=$(PWD) clean

# end #

3)编译

代码:
tony@Ubuntu:~/mini2440/mtst$ sudo make Note:好像要用sudo才行!
make -C /lib/modules/2.6.28-12-generic/build M=/home/tony/mini2440/mtst modules
make[1]: Entering directory `/usr/src/Linux-headers-2.6.28-12-generic’
  CC [M]  /home/tony/mini2440/mtst/tst.o
/home/tony/mini2440/mtst/tst.c:19: warning: function declaration isn’t a prototype
  Building modules, stage 2.
  MODPOST 1 modules        Note:生成一个module!
  CC      /home/tony/mini2440/mtst/tst.mod.o
  LD [M]  /home/tony/mini2440/mtst/tst.ko
make[1]: Leaving directory `/usr/src/Linux-headers-2.6.28-12-generic’
tony@Ubuntu:~/mini2440/mtst$

4)测试

代码:
tony@Ubuntu:~/mini2440/mtst$ su     Note:加载模块要有root特权                                          
Password:                                                                                    
root@Ubuntu:/home/tony/mini2440/mtst# insmod tst.ko  Note:加载模块要有root特权
root@Ubuntu:/home/tony/mini2440/mtst# dmesg | tail   
[   25.464531] r8169: eth0: link up            
[   25.464534] r8169: eth0: link up            
[   54.931357] UDF-fs: No VRS found            
[   54.981587] ISO 9660 Extensions: Microsoft Joliet Level 3
[   55.013712] ISOFS: changing to secondary root          
[ 2932.746291] module init                                
[ 3138.097884] Cleanup module                            
[ 7444.574136] tst: module license ‘unspecified’ taints kernel.
[ 7444.575117] Loading my so simple module…   Note:注意这两行,就是我们的模块加载信息
[ 7444.575121] I love Ubuntu                                          
root@Ubuntu:/home/tony/mini2440/mtst# lsmod | grep tst
tst                     9344  0
root@Ubuntu:/home/tony/mini2440/mtst# rmmod tst.ko
root@Ubuntu:/home/tony/mini2440/mtst# lsmod | grep tst
root@Ubuntu:/home/tony/mini2440/mtst# dmesg | tail
[   25.464534] r8169: eth0: link up
[   54.931357] UDF-fs: No VRS found
[   54.981587] ISO 9660 Extensions: Microsoft Joliet Level 3
[   55.013712] ISOFS: changing to secondary root
[ 2932.746291] module init
[ 3138.097884] Cleanup module
[ 7444.574136] tst: module license ‘unspecified’ taints kernel.
[ 7444.575117] Loading my so simple module…
[ 7444.5751

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