biosequi.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 73 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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****************************************************************************/


#include "variety.h"
#include <bios.h>
#include "necibm.h"
#include "nonibm.h"

struct EquipBits {
    unsigned bootsFromDisk      : 1;
    unsigned hasCoPro           : 1;
    unsigned ramSize            : 2;
    unsigned initialVideoMode   : 2;
    unsigned numDisketteDrives  : 2;
    unsigned noDma              : 1;
    unsigned numSerialPorts     : 3;
    unsigned hasGamePort        : 1;
    unsigned hasSerialPrinter   : 1;
    unsigned numParPrinters     : 2;
};


_WCRTLINK unsigned short _bios_equiplist( void )
{
    unsigned short          necRc;
    union {
        struct EquipBits    bits;
        unsigned short      val;
    } equip;

    if( !__NonIBM ) {
        return( __ibm_bios_equiplist() );
    } else {
        /*** Obtain as much information as we can from NEC98 info ***/
        necRc = __nec98_bios_equiplist();
        equip.val = 0;
        equip.bits.hasCoPro = necRc&0x0002 ? 1 : 0;
        equip.bits.numDisketteDrives = (necRc>>3) & 0x0003;
        equip.bits.numParPrinters = necRc&0x4000 ? 1 : 0;
        equip.bits.numSerialPorts = (necRc>>9);
        return( equip.val );
    }
}