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113 lines
3.5 KiB
C
113 lines
3.5 KiB
C
/*
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* XMS v2+ emulation
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*
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* Copyright 1998 Ove Kåven
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; 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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* Note: This XMS emulation is hooked through the DPMI interrupt.
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*/
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#include "config.h"
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#include <string.h>
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#include "winbase.h"
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#include "wine/winbase16.h"
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#include "module.h"
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#include "miscemu.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(int31);
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typedef struct {
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WORD Handle;
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DWORD Offset;
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} WINE_PACKED MOVEOFS;
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typedef struct {
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DWORD Length;
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MOVEOFS Source;
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MOVEOFS Dest;
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} WINE_PACKED MOVESTRUCT;
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static BYTE * XMS_Offset( MOVEOFS *ofs )
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{
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if (ofs->Handle) return (BYTE*)GlobalLock16(ofs->Handle)+ofs->Offset;
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else return (BYTE*)PTR_REAL_TO_LIN(SELECTOROF(ofs->Offset),OFFSETOF(ofs->Offset));
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}
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/**********************************************************************
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* XMS_Handler
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*/
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void WINAPI XMS_Handler( CONTEXT86 *context )
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{
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switch(AH_reg(context))
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{
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case 0x00: /* Get XMS version number */
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TRACE("get XMS version number\n");
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SET_AX( context, 0x0200 ); /* 2.0 */
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SET_BX( context, 0x0000 ); /* internal revision */
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SET_DX( context, 0x0001 ); /* HMA exists */
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break;
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case 0x08: /* Query Free Extended Memory */
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{
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MEMORYSTATUS status;
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TRACE("query free extended memory\n");
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GlobalMemoryStatus( &status );
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SET_DX( context, status.dwAvailVirtual >> 10 );
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SET_AX( context, status.dwAvailVirtual >> 10 );
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TRACE("returning largest %dK, total %dK\n", AX_reg(context), DX_reg(context));
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}
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break;
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case 0x09: /* Allocate Extended Memory Block */
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TRACE("allocate extended memory block (%dK)\n",
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DX_reg(context));
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SET_DX( context, GlobalAlloc16(GMEM_MOVEABLE, (DWORD)DX_reg(context)<<10) );
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SET_AX( context, DX_reg(context) ? 1 : 0 );
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if (!DX_reg(context)) SET_BL( context, 0xA0 ); /* out of memory */
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break;
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case 0x0a: /* Free Extended Memory Block */
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TRACE("free extended memory block %04x\n",DX_reg(context));
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if(!DX_reg(context) || GlobalFree16(DX_reg(context))) {
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SET_AX( context, 0 ); /* failure */
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SET_BL( context, 0xa2 ); /* invalid handle */
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} else
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SET_AX( context, 1 ); /* success */
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break;
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case 0x0b: /* Move Extended Memory Block */
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{
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MOVESTRUCT*move=CTX_SEG_OFF_TO_LIN(context,
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context->SegDs,context->Esi);
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BYTE*src,*dst;
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TRACE("move extended memory block\n");
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src=XMS_Offset(&move->Source);
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dst=XMS_Offset(&move->Dest);
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memcpy(dst,src,move->Length);
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if (move->Source.Handle) GlobalUnlock16(move->Source.Handle);
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if (move->Dest.Handle) GlobalUnlock16(move->Dest.Handle);
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break;
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}
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default:
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INT_BARF( context, 0x31 );
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SET_AX( context, 0x0000 ); /* failure */
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SET_BL( context, 0x80 ); /* function not implemented */
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break;
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}
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}
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