rtc.c

威盛 wince5.0 bsp 包 for x86 系统, 支持 VT8601 等北桥

//
// Copyright (c) Microsoft Corporation.  All rights reserved.
//
//
// Use of this source code is subject to the terms of the Microsoft end-user
// license agreement (EULA) under which you licensed this SOFTWARE PRODUCT.
// If you did not accept the terms of the EULA, you are not authorized to use
// this source code. For a copy of the EULA, please see the LICENSE.RTF on your
// install media.
//
/*++
THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
PARTICULAR PURPOSE.

Module Name:  

Abstract:  
   This file implements the NK kernel interfaces for the real time clock.
 
Functions:


Notes: 

--*/


#include <windows.h>
#include <nkintr.h>
#include <pc.h>

// NOTE: A problem has been found with some chipsets such that
// setting the time to 23:59:59 on the 29th or 30th day of a month which
// has less than 31 days causes the clock to roll over incorrectly.
// Uncomment the following line to fix this problem.  However, be aware 
// that the fix consists of responding to calls that set the time to 
// HH:MM:59 by instead setting the time to HH:MM:58.
//#define HARDWARE_TIME_SET_PROBLEM 1


SYSTEMTIME RTC_AlarmTime;
CRITICAL_SECTION RTC_critsect;


BOOL Bare_SetAlarmTime(LPSYSTEMTIME lpst);
BOOL Bare_SetRealTime(LPSYSTEMTIME lpst);
BOOL Bare_GetRealTime(LPSYSTEMTIME lpst);


BOOL OEMGetRealTime(LPSYSTEMTIME lpst)
{
    BOOL RetVal;

    EnterCriticalSection(&RTC_critsect);
    RetVal = Bare_GetRealTime(lpst);
    LeaveCriticalSection(&RTC_critsect);

    return RetVal;
}

BOOL OEMSetRealTime(LPSYSTEMTIME lpst)
{
    BOOL RetVal;

    EnterCriticalSection(&RTC_critsect);
    RetVal = Bare_SetRealTime(lpst);
    LeaveCriticalSection(&RTC_critsect);
    
    return RetVal;
}

BOOL OEMSetAlarmTime(LPSYSTEMTIME lpst)
{
    BOOL RetVal;

    EnterCriticalSection(&RTC_critsect);
    RetVal = Bare_SetAlarmTime(lpst);
    LeaveCriticalSection(&RTC_critsect);
    
    return RetVal;
}

BOOL x86IoCtlHalInitRTC (
    UINT32 code, VOID *lpInBuf, UINT32 nInBufSize, VOID *lpOutBuf, 
    UINT32 nOutBufSize, UINT32 *lpBytesReturned
) {
    // We have a battery backed CMOS based clock.  Don't actually do anything
    // to the RTC unless it appears to have been corrupted.  I guess the best
    // way to detect corruption is by checksumming CMOS
    return TRUE;
}