msdos/xms.c

   1 /*
   2  * XMS v2+ emulation
   3  *
   4  * Copyright 1998 Ove Kåven
   5  *
   6  * This XMS emulation is hooked through the DPMI interrupt.
   7  */
   8
   9 #include <unistd.h>
  10 #include <string.h>
  11 #include "winbase.h"
  12 #include "wine/winbase16.h"
  13 #include "module.h"
  14 #include "miscemu.h"
  15 #include "toolhelp.h"
  16 #include "debugtools.h"
  17
  18 DEFAULT_DEBUG_CHANNEL(int31);
  19
  20 typedef struct {
  21  WORD Handle;
  22  DWORD Offset;
  23 } WINE_PACKED MOVEOFS;
  24
  25 typedef struct {
  26  DWORD Length;
  27  MOVEOFS Source;
  28  MOVEOFS Dest;
  29 } WINE_PACKED MOVESTRUCT;
  30
  31 static BYTE * XMS_Offset( MOVEOFS *ofs )
  32 {
  33     if (ofs->Handle) return (BYTE*)GlobalLock16(ofs->Handle)+ofs->Offset;
  34         else return (BYTE*)DOSMEM_MapRealToLinear(ofs->Offset);
  35 }
  36
  37 /**********************************************************************
  38  *          XMS_Handler
  39  */
  40
  41 void WINAPI XMS_Handler( CONTEXT86 *context )
  42 {
  43     switch(AH_reg(context))
  44     {
  45     case 0x00:   /* Get XMS version number */
  46         TRACE("get XMS version number\n");
  47         AX_reg(context) = 0x0200; /* 2.0 */
  48         BX_reg(context) = 0x0000; /* internal revision */
  49         DX_reg(context) = 0x0001; /* HMA exists */
  50         break;
  51     case 0x08:   /* Query Free Extended Memory */
  52     {
  53         MEMMANINFO mmi;
  54
  55         TRACE("query free extended memory\n");
  56         mmi.dwSize = sizeof(mmi);
  57         MemManInfo16(&mmi);
  58         AX_reg(context) = mmi.dwLargestFreeBlock >> 10;
  59         DX_reg(context) = (mmi.dwFreePages * mmi.wPageSize) >> 10;
  60         TRACE("returning largest %dK, total %dK\n", AX_reg(context), DX_reg(context));
  61     }
  62     break;
  63     case 0x09:   /* Allocate Extended Memory Block */
  64         TRACE("allocate extended memory block (%dK)\n",
  65             DX_reg(context));
  66         DX_reg(context) = GlobalAlloc16(GMEM_MOVEABLE,
  67             (DWORD)DX_reg(context)<<10);
  68         AX_reg(context) = DX_reg(context) ? 1 : 0;
  69         if (!DX_reg(context)) BL_reg(context) = 0xA0; /* out of memory */
  70         break;
  71     case 0x0a:   /* Free Extended Memory Block */
  72         TRACE("free extended memory block %04x\n",DX_reg(context));
  73         GlobalFree16(DX_reg(context));
  74         break;
  75     case 0x0b:   /* Move Extended Memory Block */
  76     {
  77         MOVESTRUCT*move=CTX_SEG_OFF_TO_LIN(context,
  78             context->SegDs,context->Esi);
  79         BYTE*src,*dst;
  80         TRACE("move extended memory block\n");
  81         src=XMS_Offset(&move->Source);
  82         dst=XMS_Offset(&move->Dest);
  83         memcpy(dst,src,move->Length);
  84         if (move->Source.Handle) GlobalUnlock16(move->Source.Handle);
  85         if (move->Dest.Handle) GlobalUnlock16(move->Dest.Handle);
  86         break;
  87     }
  88     default:
  89         INT_BARF( context, 0x31 );
  90         AX_reg(context) = 0x0000; /* failure */
  91         BL_reg(context) = 0x80;   /* function not implemented */
  92         break;
  93     }
  94 }