dlls/winedos/xms.c

   1 /*
   2  * XMS v2+ emulation
   3  *
   4  * Copyright 1998 Ove Kåven
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  * Note: This XMS emulation is hooked through the DPMI interrupt.
  21  */
  22
  23 #include <unistd.h>
  24 #include <string.h>
  25 #include "winbase.h"
  26 #include "wine/winbase16.h"
  27 #include "module.h"
  28 #include "miscemu.h"
  29 #include "toolhelp.h"
  30 #include "wine/debug.h"
  31
  32 WINE_DEFAULT_DEBUG_CHANNEL(int31);
  33
  34 typedef struct {
  35  WORD Handle;
  36  DWORD Offset;
  37 } WINE_PACKED MOVEOFS;
  38
  39 typedef struct {
  40  DWORD Length;
  41  MOVEOFS Source;
  42  MOVEOFS Dest;
  43 } WINE_PACKED MOVESTRUCT;
  44
  45 static BYTE * XMS_Offset( MOVEOFS *ofs )
  46 {
  47     if (ofs->Handle) return (BYTE*)GlobalLock16(ofs->Handle)+ofs->Offset;
  48         else return (BYTE*)DOSMEM_MapRealToLinear(ofs->Offset);
  49 }
  50
  51 /**********************************************************************
  52  *          XMS_Handler
  53  */
  54
  55 void WINAPI XMS_Handler( CONTEXT86 *context )
  56 {
  57     switch(AH_reg(context))
  58     {
  59     case 0x00:   /* Get XMS version number */
  60         TRACE("get XMS version number\n");
  61         AX_reg(context) = 0x0200; /* 2.0 */
  62         BX_reg(context) = 0x0000; /* internal revision */
  63         DX_reg(context) = 0x0001; /* HMA exists */
  64         break;
  65     case 0x08:   /* Query Free Extended Memory */
  66     {
  67         MEMMANINFO mmi;
  68
  69         TRACE("query free extended memory\n");
  70         mmi.dwSize = sizeof(mmi);
  71         MemManInfo16(&mmi);
  72         AX_reg(context) = mmi.dwLargestFreeBlock >> 10;
  73         DX_reg(context) = (mmi.dwFreePages * mmi.wPageSize) >> 10;
  74         TRACE("returning largest %dK, total %dK\n", AX_reg(context), DX_reg(context));
  75     }
  76     break;
  77     case 0x09:   /* Allocate Extended Memory Block */
  78         TRACE("allocate extended memory block (%dK)\n",
  79             DX_reg(context));
  80         DX_reg(context) = GlobalAlloc16(GMEM_MOVEABLE,
  81             (DWORD)DX_reg(context)<<10);
  82         AX_reg(context) = DX_reg(context) ? 1 : 0;
  83         if (!DX_reg(context)) BL_reg(context) = 0xA0; /* out of memory */
  84         break;
  85     case 0x0a:   /* Free Extended Memory Block */
  86         TRACE("free extended memory block %04x\n",DX_reg(context));
  87         GlobalFree16(DX_reg(context));
  88         break;
  89     case 0x0b:   /* Move Extended Memory Block */
  90     {
  91         MOVESTRUCT*move=CTX_SEG_OFF_TO_LIN(context,
  92             context->SegDs,context->Esi);
  93         BYTE*src,*dst;
  94         TRACE("move extended memory block\n");
  95         src=XMS_Offset(&move->Source);
  96         dst=XMS_Offset(&move->Dest);
  97         memcpy(dst,src,move->Length);
  98         if (move->Source.Handle) GlobalUnlock16(move->Source.Handle);
  99         if (move->Dest.Handle) GlobalUnlock16(move->Dest.Handle);
 100         break;
 101     }
 102     default:
 103         INT_BARF( context, 0x31 );
 104         AX_reg(context) = 0x0000; /* failure */
 105         BL_reg(context) = 0x80;   /* function not implemented */
 106         break;
 107     }
 108 }