idle.c

我自己编译的armv4i wince60模拟器的bps源文件,已经验证可以使用,欢迎下载

//
// Copyright (c) Microsoft Corporation.  All rights reserved.
//
//
// Use of this sample source code is subject to the terms of the Microsoft
// license agreement under which you licensed this sample source code. If
// you did not accept the terms of the license agreement, you are not
// authorized to use this sample source code. For the terms of the license,
// please see the license agreement between you and Microsoft or, if applicable,
// see the LICENSE.RTF on your install media or the root of your tools installation.
// THE SAMPLE SOURCE CODE IS PROVIDED "AS IS", WITH NO WARRANTIES.
//
//------------------------------------------------------------------------------
//
//  File: idle.c
//
//  This file contains OEMIdle function stub.
//
#include <windows.h>
#include <nkintr.h>
#include <oal.h>

//------------------------------------------------------------------------------
//
//  Function:     OEMIdle
//
//  This function is called by the kernel when there are no threads ready to 
//  run. The CPU should be put into a reduced power mode if possible and halted. 
//  It is important to be able to resume execution quickly upon receiving an 
//  interrupt.
//
//  It is assumed that interrupts are off when OEMIdle is called. Interrupts
//  are also turned off when OEMIdle returns.
//

// enable optimization for both debug and retail builds so that the Emulator
// will be able to recognize the OEMIdle opcode sequence
#pragma optimize("gsy", on)

VOID OEMIdle(DWORD idleParam)
{
    extern volatile BOOL fInterruptFlag;
    INT32 elapsedCounts;
    UINT64 idleStartCounts, idleCounts;
    ULARGE_INTEGER idle;
    
    // Save the current tick count
    idleStartCounts = g_oalTimer.curCounts;

    // Find how many hi-res ticks already elapsed
    elapsedCounts = OALTimerCountsSinceSysTick();

    // increment the start count by the elapsed count since last tick
    idleStartCounts += elapsedCounts;

    // Entered with interrupts disabled. Safely clear the flag.
    fInterruptFlag = 0;

    // Re-enable interrupts, and do nothing until one occurs.
    INTERRUPTS_ON();
    do {} while (!fInterruptFlag);

    // Turn interrupts back off, just like when entered.
    INTERRUPTS_OFF();

    // This is idle time in hi-res ticks
    idleCounts = g_oalTimer.curCounts - idleStartCounts;

    // Update Kernel idle counters
    idle.LowPart = curridlelow;
    idle.HighPart = curridlehigh;
    idle.QuadPart += idleCounts;
    curridlelow  = idle.LowPart;
    curridlehigh = idle.HighPart;
}

//------------------------------------------------------------------------------