timer.c

来自「详细介绍了一篇关于pci开发的接口芯片」· C语言 代码 · 共 27 行

/*  CXL - Copyright (c) 1987-1989 by Mike Smedley - All Rights Reserved  */
/*  TIMER.C     - returns the value of the BIOS timer   */

#include <dos.h>
#include "cxldef.h"

#if      defined(_M_IX86) && !defined(__ZTC__)    /*  Microsoft C/QuickC  */
#define  disable()  _disable()
#define  enable()   _enable()
#elif    defined(__ZTC__)                       /*  Zortech C++  */
#include <int.h>
#define  disable()  int_off()
#define  enable()   int_on()
#endif

unsigned long timer(void)
{
   unsigned long value;
   REALPTR p;

   RP_SET(p, 0x006c, 0x40);
   disable();
   value=PeekRealDWord(p);
   enable();
   return(value);
}