103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
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/*
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Copyright (C) 1994-1995 Apogee Software, Ltd.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/**********************************************************************
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module: DPMI.H
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author: James R. Dose
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date: March 31, 1994
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Inline functions for performing DPMI calls.
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(c) Copyright 1994 James R. Dose. All Rights Reserved.
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**********************************************************************/
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#ifndef __DPMI_H
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#define __DPMI_H
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enum DPMI_Errors
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{
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DPMI_Warning = -2,
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DPMI_Error = -1,
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DPMI_Ok = 0
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};
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typedef struct
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{
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unsigned long EDI;
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unsigned long ESI;
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unsigned long EBP;
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unsigned long Reserved;
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unsigned long EBX;
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unsigned long EDX;
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unsigned long ECX;
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unsigned long EAX;
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unsigned short Flags;
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unsigned short ES;
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unsigned short DS;
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unsigned short FS;
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unsigned short GS;
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unsigned short IP;
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unsigned short CS;
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unsigned short SP;
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unsigned short SS;
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} dpmi_regs;
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unsigned long DPMI_GetRealModeVector( int num );
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void DPMI_SetRealModeVector( int num, unsigned long vector );
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int DPMI_CallRealModeFunction( dpmi_regs *callregs );
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int DPMI_GetDOSMemory( void **ptr, int *descriptor, unsigned length );
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int DPMI_FreeDOSMemory( int descriptor );
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int DPMI_LockMemory( void *address, unsigned length );
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int DPMI_LockMemoryRegion( void *start, void *end );
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int DPMI_UnlockMemory( void *address, unsigned length );
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int DPMI_UnlockMemoryRegion( void *start, void *end );
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#define DPMI_Lock( variable ) \
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( DPMI_LockMemory( (void *) &( variable ), sizeof( variable ) ) )
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#define DPMI_Unlock( variable ) \
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( DPMI_UnlockMemory( (void *) &( variable ), sizeof( variable ) ) )
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#ifdef PLAT_DOS
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#pragma aux DPMI_GetDOSMemory = \
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"mov eax, 0100h", \
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"add ebx, 15", \
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"shr ebx, 4", \
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"int 31h", \
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"jc DPMI_Exit", \
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"movzx eax, ax", \
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"shl eax, 4", \
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"mov [ esi ], eax", \
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"mov [ edi ], edx", \
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"sub eax, eax", \
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"DPMI_Exit:", \
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parm [ esi ] [ edi ] [ ebx ] modify exact [ eax ebx edx ];
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#pragma aux DPMI_FreeDOSMemory = \
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"mov eax, 0101h", \
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"int 31h", \
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"jc DPMI_Exit", \
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"sub eax, eax", \
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"DPMI_Exit:", \
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parm [ edx ] modify exact [ eax ];
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#endif
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#endif
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