mos_sw.cpp

用VC编写的一个微型操作系统

// Mos_sw.cpp: implementation of the CMos_sw class.
// Code by biti_zx. Released March,2002.
// Copyright (C) 2002 by biti_zx.
// All rights reserved.
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "Mos.h"
#include "Mos_sw.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
extern CVCS m_cpu;
extern PCB m_pcb;
CMos_sw::CMos_sw()
{

}

CMos_sw::~CMos_sw()
{

}

void CMos_sw::idle()
{
	m_UI.DealWithUI(_T("IDLE"),IDC_STATIC_CPU);
	for(;;){
		m_cpu.clock();
		m_cpu.idletime++;//闲逛计数
		if(m_cpu.Test())
			return;
	}
}

void CMos_sw::run()
{
	if(m_pcb.curr_pcb==NULL){
		idle();//有中断时返回
		m_inth.interrupt_handle();//接着处理中断
	}
	else{
		  if(m_pcb.curr_pcb->pid>3)//处理用户进程
		  {//恢复现场
			  m_UI.DealWithUI(_T("USER"),IDC_STATIC_CPU);
			  m_cpu.C = m_pcb.curr_pcb->regc;
			  m_cpu.PC[0] = m_pcb.curr_pcb->regpc[0];
			  m_cpu.PC[1] = m_pcb.curr_pcb->regpc[1];
			  for(int i=0;i<=3;i++)
				  m_cpu.R[i] = m_pcb.curr_pcb->regr[i];
			  m_cpu.PTR.op4 = m_pcb.curr_pcb->regptr[3];
			  m_cpu.PTR.op3 = m_pcb.curr_pcb->regptr[2];
			  m_cpu.PTR.op2 = m_pcb.curr_pcb->regptr[1];
			  m_cpu.PTR.op1 = m_pcb.curr_pcb->regptr[0];
		  }
		  m_cpu.MODE = m_pcb.curr_pcb->mode;
		  switch(m_pcb.curr_pcb->pid)
		  {
			case 1:m_UI.DealWithUI(_T("KERNEL"),IDC_STATIC_CPU);m_in.pre_input();break;
			case 2:m_UI.DealWithUI(_T("KERNEL"),IDC_STATIC_CPU);m_jsw.jsw();break;
			case 3:m_UI.DealWithUI(_T("KERNEL"),IDC_STATIC_CPU);m_out.delay_output();break;
				//仅当自己睡眠后函数返回,接着转进程调度
			case 4:case 5:case 6:case 7:case 8:
				   m_cpu.VCS();//有中断时返回
				   m_inth.interrupt_handle();//接着处理中断
			default:break;
		  }
	}//end of else
}

void CMos_sw::swtch()
{
	m_UI.DealWithUI(_T(" "),IDC_STATIC_CP);
	m_pcb.curr_pcb = mos_proc.GetQueueHead(m_pcb.readypcbhead,m_pcb.readypcbtail,IDC_STATIC_RP);
	if(m_pcb.curr_pcb != NULL&&m_pcb.curr_pcb->mode == USERMODE)
		m_cpu.time = 10;
	if(m_pcb.curr_pcb!=NULL)
	{
		CString str;
		str.Format("->P%d",m_pcb.curr_pcb->pid);
		m_UI.DealWithUI(str,IDC_STATIC_CP);
	}
	else m_UI.DealWithUI(_T(" "),IDC_STATIC_CP);
	run();
}