/*
THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.  
COPYRIGHT 1993-1999 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
*/

#ifndef _DPMI_H
#define _DPMI_H

#include "pstypes.h"

typedef struct dpmi_real_regs {
    uint edi;
    uint esi;
    uint ebp;
    uint reserved_by_system;
    uint ebx;
    uint edx;
    uint ecx;
    uint eax;
    ushort flags;
    ushort es,ds,fs,gs,ip,cs,sp,ss;
} dpmi_real_regs;

#pragma intrinsic( inp );
#pragma intrinsic( outp );
#pragma intrinsic( _enable );
#pragma intrinsic( _disable );

#define DPMI_real_segment(P)	((((uint) (P)) >> 4) & 0xFFFF)
#define DPMI_real_offset(P)	(((uint) (P)) & 0xF)

// Initializes dpmi. Returns zero if failed.
extern int dpmi_init(int verbose);
// Returns a pointer to a temporary dos memory block. Size must be < 1024 bytes.
extern void *dpmi_get_temp_low_buffer( int size );
extern void *dpmi_real_malloc( int size, ushort *selector );
extern void dpmi_real_free( ushort selector );
extern void dpmi_real_int386x( ubyte intno, dpmi_real_regs * rregs );
extern void dpmi_real_call(dpmi_real_regs * rregs);
extern int dpmi_lock_region(void *address, unsigned length);
extern int dpmi_unlock_region(void *address, unsigned length);
// returns 0 if failed...
extern int dpmi_allocate_selector( void * address, int size, ushort * selector );
extern int dpmi_modify_selector_base( ushort selector, void * address );
extern int dpmi_modify_selector_limit( ushort selector, int size  );


// Sets the PM handler. Returns 0 if succssful
extern int dpmi_set_pm_handler(unsigned intnum, void far * isr );

extern unsigned int dpmi_virtual_memory;
extern unsigned int dpmi_available_memory;
extern unsigned int dpmi_physical_memory;
extern unsigned int dpmi_dos_memory;

#endif