内核及设备驱动实验报告

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1、内核及设备驱动实验报告一、实验目的1.学习Linux操作系统下内核程序的编写和应用。2.学习可编程接口芯片的编程控制方法。二、实验内容与要求1.完成一个内核模块的编写，实现内核模块的正确加载和卸载。2.建立一个虚拟的字符设备驱动程序，至少要包含读、写功能，为用户程序提供内核空间与用户空间的数据交换，方案及实现过程自定。3.在上面的基础上完成8253与自编的应用程序结合，实现特定的功能。三、实验记录与分析程序清单：1.驱动程序#include#include#

2、include#includeintinit_module(void);voidcleanup_module(void);staticintdevice_open(structinode*,structfile*);staticintdevice_release(structinode*,structfile*);staticssize_tdevice_read(structfile*,char*,size_t,loff_t*);staticssize_tdevice

3、_write(structfile*,constchar*,size_t,loff_t*);#defineSUCCESS0#defineDEVICE_NAME"chardev"#defineBUF_LEN80staticintMajor;staticintDevice_Open=0;staticcharmsg[BUF_LEN];staticchar*msg_Ptr;staticstructfile_operationsfops={.read=device_read,.write=device_write,.open=de

4、vice_open,.release=device_release};intinit_module(void){Major=register_chrdev(0,DEVICE_NAME,&fops);if(Major<0){printk("Registeringthecharacterdevicefailedwith%d",Major);returnMajor;}printk("<1>Iwasassignedmajornumber%d.Totalkto",Major);printk("<1>thedriver,cr

5、eateadevfilewith");printk("'mknod/dev/helloc%d0'.",Major);printk("<1>Tryvariousminornumbers.Trytocatandechoto");printk("thedevicefile.");printk("<1>Removethedevicefileandmodulewhendone.");return0;}voidcleanup_module(void){intret=unregister_chrdev(Major,

6、DEVICE_NAME);if(ret<0)printk("Errorinunregister_chrdev:%d",ret);}staticintdevice_open(structinode*inode,structfile*file){staticintcounter=0;if(Device_Open)return-EBUSY;printk("majorandminordevicenumber=%x",inode->i_rdev);printk("Majornumber=%d",MAJOR(inode-

7、>i_rdev));Device_Open++;sprintf(msg,"Ihavealreadytoldyou%dtimesHelloworld!",counter++);msg_Ptr=msg;returnSUCCESS;}staticintdevice_release(structinode*inode,structfile*file){Device_Open--;return0;}staticssize_tdevice_read(structfile*filp,char*buffer,size_tlength

8、,loff_t*offset){intbytes_read=0;if(*msg_Ptr==0)return0;while(length&&*msg_Ptr){put_user(*(msg_Ptr++),buffer++);length--;bytes_read++;}returnbytes_read;}statics