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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * Note: This XMS emulation is hooked through the DPMI interrupt.
  21  */
  22
  23 #include "config.h"
  24
  25 #ifdef HAVE_UNISTD_H
  26 # include <unistd.h>
  27 #endif
  28 #include <stdarg.h>
  29 #include <string.h>
  30 #include "windef.h"
  31 #include "winbase.h"
  32 #include "wine/winbase16.h"
  33 #include "dosexe.h"
  34 #include "wine/debug.h"
  35
  36 WINE_DEFAULT_DEBUG_CHANNEL(int31);
  37
  38 #include "pshpack1.h"
  39
  40 typedef struct {
  41  WORD Handle;
  42  DWORD Offset;
  43 } MOVEOFS;
  44
  45 typedef struct {
  46  DWORD Length;
  47  MOVEOFS Source;
  48  MOVEOFS Dest;
  49 } MOVESTRUCT;
  50
  51 #include "poppack.h"
  52
  53 static BYTE * XMS_Offset( MOVEOFS *ofs )
  54 {
  55     if (ofs->Handle) return (BYTE*)GlobalLock16(ofs->Handle)+ofs->Offset;
  56     else return (BYTE*)PTR_REAL_TO_LIN(SELECTOROF(ofs->Offset),OFFSETOF(ofs->Offset));
  57 }
  58
  59 /**********************************************************************
  60  *          XMS_Handler
  61  */
  62
  63 void WINAPI XMS_Handler( CONTEXT86 *context )
  64 {
  65     switch(AH_reg(context))
  66     {
  67     case 0x00:   /* Get XMS version number */
  68         TRACE("get XMS version number\n");
  69         SET_AX( context, 0x0200 ); /* 2.0 */
  70         SET_BX( context, 0x0000 ); /* internal revision */
  71         SET_DX( context, 0x0001 ); /* HMA exists */
  72         break;
  73     case 0x08:   /* Query Free Extended Memory */
  74     {
  75         MEMORYSTATUS status;
  76
  77         TRACE("query free extended memory\n");
  78         GlobalMemoryStatus( &status );
  79         SET_DX( context, status.dwAvailVirtual >> 10 );
  80         SET_AX( context, status.dwAvailVirtual >> 10 );
  81         TRACE("returning largest %dK, total %dK\n", AX_reg(context), DX_reg(context));
  82     }
  83     break;
  84     case 0x09:   /* Allocate Extended Memory Block */
  85         TRACE("allocate extended memory block (%dK)\n",
  86             DX_reg(context));
  87         SET_DX( context, GlobalAlloc16(GMEM_MOVEABLE, (DWORD)DX_reg(context)<<10) );
  88         SET_AX( context, DX_reg(context) ? 1 : 0 );
  89         if (!DX_reg(context)) SET_BL( context, 0xA0 ); /* out of memory */
  90         break;
  91     case 0x0a:   /* Free Extended Memory Block */
  92         TRACE("free extended memory block %04x\n",DX_reg(context));
  93        if(!DX_reg(context) || GlobalFree16(DX_reg(context))) {
  94          SET_AX( context, 0 );    /* failure */
  95          SET_BL( context, 0xa2 ); /* invalid handle */
  96        } else
  97          SET_AX( context, 1 );    /* success */
  98         break;
  99     case 0x0b:   /* Move Extended Memory Block */
 100     {
 101         MOVESTRUCT*move=CTX_SEG_OFF_TO_LIN(context,
 102             context->SegDs,context->Esi);
 103         BYTE*src,*dst;
 104         TRACE("move extended memory block\n");
 105         src=XMS_Offset(&move->Source);
 106         dst=XMS_Offset(&move->Dest);
 107         memcpy(dst,src,move->Length);
 108         if (move->Source.Handle) GlobalUnlock16(move->Source.Handle);
 109         if (move->Dest.Handle) GlobalUnlock16(move->Dest.Handle);
 110         break;
 111     }
 112     case 0x88:   /* Query Any Free Extended Memory */
 113     {
 114         MEMORYSTATUS status;
 115         SYSTEM_INFO  info;
 116
 117         TRACE("query any free extended memory\n");
 118
 119         GlobalMemoryStatus( &status );
 120         GetSystemInfo( &info );
 121         context->Eax = status.dwAvailVirtual >> 10;
 122         context->Edx = status.dwAvailVirtual >> 10;
 123         context->Ecx = (DWORD)info.lpMaximumApplicationAddress;
 124         SET_BL( context, 0 ); /* No errors. */
 125
 126         TRACE("returning largest %dK, total %dK, highest 0x%x\n",
 127               context->Eax, context->Edx, context->Ecx);
 128     }
 129     break;
 130     default:
 131         INT_BARF( context, 0x31 );
 132         SET_AX( context, 0x0000 ); /* failure */
 133         SET_BL( context, 0x80 );   /* function not implemented */
 134         break;
 135     }
 136 }