GeekOS操作系统课程设计 项目0

GeekOS操作系统课程设计 项目0

环境配置可以见文章 ：

记录bochs+geekos报错指南

1. 实现目标

实现一个内核进程，该进程的功能是：接收键盘输入的字符并显示到屏幕上，当输入ctrl+d时，结束进程的运行。

2. 操作流程

GeekOS 中的内核进程一般写在 project/src/geekos 目录中，通过修改 main.c 实现上述目标，具体代码如下。

// main.c
/*
 * GeekOS C code entry point
 * Copyright (c) 2001,2003,2004 David H. Hovemeyer <daveho@cs.umd.edu>
 * Copyright (c) 2003, Jeffrey K. Hollingsworth <hollings@cs.umd.edu>
 * Copyright (c) 2004, Iulian Neamtiu <neamtiu@cs.umd.edu>
 * $Revision: 1.51 $
 * 
 * This is free software.  You are permitted to use,
 * redistribute, and modify it as specified in the file "COPYING".
 */

#include <geekos/bootinfo.h>
#include <geekos/string.h>
#include <geekos/screen.h>
#include <geekos/mem.h>
#include <geekos/crc32.h>
#include <geekos/tss.h>
#include <geekos/int.h>
#include <geekos/kthread.h>
#include <geekos/trap.h>
#include <geekos/timer.h>
#include <geekos/keyboard.h>

/*
 * project0
 */
void project0(){
    Print("To Exit hit Ctrl + d.\n");
    Keycode keycode;
    while(1)
    {
        if(Read_Key(&keycode))
        {
            if(!((keycode & KEY_SPECIAL_FLAG) || (keycode & KEY_RELEASE_FLAG)))// 不是特殊键或者弹起
            {
                int asciiCode = keycode & 0xff;//d
                if((keycode & KEY_CTRL_FLAG)==KEY_CTRL_FLAG && asciiCode=='d')//ctrl+d
                {
                    Print("\n---------BYE!---------\n");
                    Exit(1);
                }else
                {
                    Print("%c",(asciiCode=='\r') ? '\n' : asciiCode);
                }
            }
        }
    }
}

/*
 * Kernel C code entry point.
 * Initializes kernel subsystems, mounts filesystems,
 * and spawns init process.
 */
void Main(struct Boot_Info* bootInfo)
{
    Init_BSS();
    Init_Screen();
    Init_Mem(bootInfo);
    Init_CRC32();
    Init_TSS();
    Init_Interrupts();
    Init_Scheduler();
    Init_Traps();
    Init_Timer();
    Init_Keyboard();


    Set_Current_Attr(ATTRIB(BLACK, GREEN|BRIGHT));
    Print("Welcome to GeekOS!\n");
    Set_Current_Attr(ATTRIB(BLACK, GRAY));


    // TODO("Start a kernel thread to echo pressed keys and print counts");

    Start_Kernel_Thread((Thread_Start_Func)project0, 0, PRIORITY_NORMAL, true);

    /* 让主线程挂起 */
    while (1);
}

3. 运行结果

# cd至project0/build目录下 运行下述指令
make depend
sudo make 
bochs

参考

GeekOS操作系统课程设计 project0