cpuinfo.c

来自「BIOS emulator and interface to Realmode 」· C语言 代码 · 共 73 行

/****************************************************************************
*
*						  Ultra Long Period Timer
*
*  ========================================================================
*
*    The contents of this file are subject to the SciTech MGL Public
*    License Version 1.0 (the "License"); you may not use this file
*    except in compliance with the License. You may obtain a copy of
*    the License at http://www.scitechsoft.com/mgl-license.txt
*
*    Software distributed under the License is distributed on an
*    "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
*    implied. See the License for the specific language governing
*    rights and limitations under the License.
*
*    The Original Code is Copyright (C) 1991-1998 SciTech Software, Inc.
*
*    The Initial Developer of the Original Code is SciTech Software, Inc.
*    All Rights Reserved.
*
*  ========================================================================
*
* Language:		ANSI C
* Environment:	DOS
*
* Description:	MSDOS specific code for the CPU detection module.
*
****************************************************************************/

/*----------------------------- Implementation ----------------------------*/

/* External timing function */

void __ZTimerInit(void);

/****************************************************************************
REMARKS:
Do nothing for DOS because we don't have thread priorities.
****************************************************************************/
#define	SetMaxThreadPriority()		0

/****************************************************************************
REMARKS:
Do nothing for DOS because we don't have thread priorities.
****************************************************************************/
#define	RestoreThreadPriority(i)	(void)(i)

/****************************************************************************
REMARKS:
Initialise the counter and return the frequency of the counter.
****************************************************************************/
static void GetCounterFrequency(
	CPU_largeInteger *freq)
{
	float	resolution;

	__ZTimerInit();
	ULZTimerResolution(&resolution);
	freq->low = (ulong)(10000.0 / resolution);
	freq->high = 0;
}

/****************************************************************************
REMARKS:
Read the counter and return the counter value.
****************************************************************************/
#define	GetCounter(t)					\
{                                   	\
	(t)->low = ULZReadTime() * 10000L;	\
	(t)->high = 0;						\
}