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