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96 lines
2.6 KiB
C
96 lines
2.6 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 XMS emulation is hooked through the DPMI interrupt.
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*/
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#include <unistd.h>
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#include <string.h>
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#include "winbase.h"
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#include "global.h"
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#include "module.h"
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#include "miscemu.h"
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#include "toolhelp.h"
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#include "debugtools.h"
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#include "selectors.h"
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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*)DOSMEM_MapRealToLinear(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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AX_reg(context) = 0x0200; /* 2.0 */
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BX_reg(context) = 0x0000; /* internal revision */
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DX_reg(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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MEMMANINFO mmi;
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TRACE("query free extended memory\n");
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mmi.dwSize = sizeof(mmi);
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MemManInfo16(&mmi);
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AX_reg(context) = mmi.dwLargestFreeBlock >> 10;
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DX_reg(context) = (mmi.dwFreePages * VIRTUAL_GetPageSize()) >> 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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DX_reg(context) = GlobalAlloc16(GMEM_MOVEABLE,
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(DWORD)DX_reg(context)<<10);
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AX_reg(context) = DX_reg(context) ? 1 : 0;
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if (!DX_reg(context)) BL_reg(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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GlobalFree16(DX_reg(context));
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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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DS_reg(context),ESI_reg(context));
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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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AX_reg(context) = 0x0000; /* failure */
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BL_reg(context) = 0x80; /* function not implemented */
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break;
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}
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}
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