helloworld.ko

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原创最新推荐文章于 2026-05-27 20:17:44 发布 362 阅读 AI 写同款· GEO 优化 ›

Linux设备驱动 ----helloworld.ko 毕业已经好多年了，从单片机到毕业后的安卓开发，虽然在上面工作了很多时间，但是总感觉自己缺点什么。总的来说对知识的储备其实不是那么充足，对一些深层次的东西理解也不是很透彻，当然自己也缺少一股冲劲与恒心。所以现在想在优快云上中记录对基础知识的一些巩固，对程序员而言真的是需要多看多写，才能对自己有所提高，不然到最后可能还是那个水平，废话可能有点多了........下面进入正题最简单的驱动编译，注... 阅读详情

helloworld模块：

xxha@xxha-OptiPlex-780:~/share/learning/songbaohua/4_char_device_driver/helloworld$vim hello.c

1 /*======================================================================
  2 A simple kernel module: "hello world"
  3 
  4 The initial developer of the original code is Baohua Song
  5 <author@linuxdriver.cn>. All Rights Reserved.
  6 ======================================================================*/
  7 #include <linux/init.h>
  8 #include <linux/module.h>
  9 MODULE_LICENSE("Dual BSD/GPL");
 10 static int hello_init(void)
 11 {
 12 printk(KERN_INFO " Hello World enter\n");
 13 return 0;
 14 }
 15 
 16 static void hello_exit(void)
 17 {
 18 printk(KERN_INFO " Hello World exit\n ");
 19 }
 20 
 21 module_init(hello_init);
 22 module_exit(hello_exit);
 23 
 24 MODULE_AUTHOR("Song Baohua");
 25 MODULE_DESCRIPTION("A simple Hello World Module");
 26 MODULE_ALIAS("a simplest module");

xxha@xxha-OptiPlex-780:~/share/learning/songbaohua/4_char_device_driver/helloworld$vim Makefile

1 obj-m := hello.o
  2 
  3 clean: 
  4 rm -rf *.ko *.mod.c *.o *.order *.symvers

编译模块：
xxha@xxha-OptiPlex-780:~/share/learning/songbaohua/4_char_device_driver/helloworld$make -C /usr/src/linux-headers-2.6.35-22-generic/ M=$(pwd) modules
make:进入目录'/usr/src/linux-headers-2.6.35-22-generic'
CC [M] /home/xxha/share/learning/songbaohua/4_char_device_driver/helloworld/hello.o
Building modules, stage 2.
MODPOST 1 modules
CC      /home/xxha/share/learning/songbaohua/4_char_device_driver/helloworld/hello.mod.o
LD [M] /home/xxha/share/learning/songbaohua/4_char_device_driver/helloworld/hello.ko
make:离开目录“/usr/src/linux-headers-2.6.35-22-generic”

xxha@xxha-OptiPlex-780:~/share/learning/songbaohua/4_char_device_driver/helloworld$ls
hello.c hello.ko hello.mod.c hello.mod.o hello.o Makefile modules.order Module.symvers

xxha@xxha-OptiPlex-780:~/share/learning/songbaohua/4_char_device_driver/helloworld$sudo insmod hello.ko

xxha@xxha-OptiPlex-780:~/share/learning/songbaohua/4_char_device_driver/helloworld$tail -n 2 /var/log/messages
Jan 24 11:13:15 xxha-OptiPlex-780 kernel: [ 6909.919001] book num:5000
Jan 24 13:38:43 xxha-OptiPlex-780 kernel: [15638.098334] Hello World enter

xxha@xxha-OptiPlex-780:~/share/learning/songbaohua/4_char_device_driver/helloworld$modinfo hello.ko    //查询模块的信息。
filename:       hello.ko
alias:          a simplest module
description:    A simple Hello World Module
author:         Song Baohua
license:        Dual BSD/GPL
srcversion:     AF31C8A811E72E11F852B3E
depends:
vermagic:       2.6.35.4 SMP mod_unload modversions

xxha@xxha-OptiPlex-780:~/share/learning/songbaohua/4_char_device_driver/helloworld$sudo rmmod hello.ko
xxha@xxha-OptiPlex-780:~/share/learning/songbaohua/4_char_device_driver/helloworld$tail -n 2 /var/log/messages
Jan 24 13:38:43 xxha-OptiPlex-780 kernel: [15638.098334] Hello World enter
Jan 24 13:40:34 xxha-OptiPlex-780 kernel: [15748.893361] Hello World exit

这就是helloworld.ko，超简单。