4 * Copyright 1998 Ove Kåven
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.
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.
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
20 * Note: This XMS emulation is hooked through the DPMI interrupt.
30 #include "wine/winbase16.h"
32 #include "wine/debug.h"
34 WINE_DEFAULT_DEBUG_CHANNEL(int31);
39 } WINE_PACKED MOVEOFS;
45 } WINE_PACKED MOVESTRUCT;
47 static BYTE * XMS_Offset( MOVEOFS *ofs )
49 if (ofs->Handle) return (BYTE*)GlobalLock16(ofs->Handle)+ofs->Offset;
50 else return (BYTE*)PTR_REAL_TO_LIN(SELECTOROF(ofs->Offset),OFFSETOF(ofs->Offset));
53 /**********************************************************************
57 void WINAPI XMS_Handler( CONTEXT86 *context )
59 switch(AH_reg(context))
61 case 0x00: /* Get XMS version number */
62 TRACE("get XMS version number\n");
63 SET_AX( context, 0x0200 ); /* 2.0 */
64 SET_BX( context, 0x0000 ); /* internal revision */
65 SET_DX( context, 0x0001 ); /* HMA exists */
67 case 0x08: /* Query Free Extended Memory */
71 TRACE("query free extended memory\n");
72 GlobalMemoryStatus( &status );
73 SET_DX( context, status.dwAvailVirtual >> 10 );
74 SET_AX( context, status.dwAvailVirtual >> 10 );
75 TRACE("returning largest %dK, total %dK\n", AX_reg(context), DX_reg(context));
78 case 0x09: /* Allocate Extended Memory Block */
79 TRACE("allocate extended memory block (%dK)\n",
81 SET_DX( context, GlobalAlloc16(GMEM_MOVEABLE, (DWORD)DX_reg(context)<<10) );
82 SET_AX( context, DX_reg(context) ? 1 : 0 );
83 if (!DX_reg(context)) SET_BL( context, 0xA0 ); /* out of memory */
85 case 0x0a: /* Free Extended Memory Block */
86 TRACE("free extended memory block %04x\n",DX_reg(context));
87 if(!DX_reg(context) || GlobalFree16(DX_reg(context))) {
88 SET_AX( context, 0 ); /* failure */
89 SET_BL( context, 0xa2 ); /* invalid handle */
91 SET_AX( context, 1 ); /* success */
93 case 0x0b: /* Move Extended Memory Block */
95 MOVESTRUCT*move=CTX_SEG_OFF_TO_LIN(context,
96 context->SegDs,context->Esi);
98 TRACE("move extended memory block\n");
99 src=XMS_Offset(&move->Source);
100 dst=XMS_Offset(&move->Dest);
101 memcpy(dst,src,move->Length);
102 if (move->Source.Handle) GlobalUnlock16(move->Source.Handle);
103 if (move->Dest.Handle) GlobalUnlock16(move->Dest.Handle);
106 case 0x88: /* Query Any Free Extended Memory */
111 TRACE("query any free extended memory\n");
113 GlobalMemoryStatus( &status );
114 GetSystemInfo( &info );
115 context->Eax = status.dwAvailVirtual >> 10;
116 context->Edx = status.dwAvailVirtual >> 10;
117 context->Ecx = (DWORD)info.lpMaximumApplicationAddress;
118 SET_BL( context, 0 ); /* No errors. */
120 TRACE("returning largest %ldK, total %ldK, highest 0x%lx\n",
121 context->Eax, context->Edx, context->Ecx);
125 INT_BARF( context, 0x31 );
126 SET_AX( context, 0x0000 ); /* failure */
127 SET_BL( context, 0x80 ); /* function not implemented */