exe16m.h

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/****************************************************************************
*
*                            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
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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*    available at www.sybase.com/developer/opensource.
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* Description:  DOS/16M executable format structures and constants.
*
****************************************************************************/


#ifndef _EXE16M_H

typedef struct gdt_info {
    unsigned_16     gdtlen;
    unsigned_16     gdtaddr;
    unsigned_8      gdtaddr_hi;
    unsigned_8      gdtaccess;
    unsigned_16     gdtreserved;
} gdt_info;

// the values for the options fiels.

enum {
    OPT_KEYBOARD        = 0x0004,
    OPT_OVERLOAD        = 0x0008,
    OPT_INT10           = 0x0010,
    OPT_INIT00          = 0x0020,
    OPT_INITFF          = 0x0040,
    OPT_ROTATE          = 0x0080,
    OPT_AUTO            = 0x1000,
};

#define TRANSPARENT 0x8000

#define NUM_RESERVED_SELS    16         // number of reserved selectors.

// memory strategy constants
#define MPreferExt 0    /* prefer, but not force, extended */
#define MPreferLow 1    /* prefer, but not force, conventional memory */
#define MForceExt 2     /* force extended */
#define MForceLow 3     /* force conventional */
#define MNoStrategy 0   /* no strategy specified */

#define acc_code 0x9A   /* present, priv 0, code, read, accessed */
#define acc_data 0x92   /* present, priv 0, data, write, accessed */

#define user_sel 0x80   /* first user selecter (user_gdt << 3) */

#define _EXE16M_H
#endif