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 "global.h"
  14 #include "module.h"
  15 #include "miscemu.h"
  16 #include "toolhelp.h"
  17 #include "debugtools.h"
  18 #include "selectors.h"
  19
  20 DEFAULT_DEBUG_CHANNEL(int31);
  21
  22 typedef struct {
  23  WORD Handle;
  24  DWORD Offset;
  25 } WINE_PACKED MOVEOFS;
  26
  27 typedef struct {
  28  DWORD Length;
  29  MOVEOFS Source;
  30  MOVEOFS Dest;
  31 } WINE_PACKED MOVESTRUCT;
  32
  33 static BYTE * XMS_Offset( MOVEOFS *ofs )
  34 {
  35     if (ofs->Handle) return (BYTE*)GlobalLock16(ofs->Handle)+ofs->Offset;
  36         else return (BYTE*)DOSMEM_MapRealToLinear(ofs->Offset);
  37 }
  38
  39 /**********************************************************************
  40  *          XMS_Handler
  41  */
  42
  43 void WINAPI XMS_Handler( CONTEXT86 *context )
  44 {
  45     switch(AH_reg(context))
  46     {
  47     case 0x00:   /* Get XMS version number */
  48         TRACE("get XMS version number\n");
  49         AX_reg(context) = 0x0200; /* 2.0 */
  50         BX_reg(context) = 0x0000; /* internal revision */
  51         DX_reg(context) = 0x0001; /* HMA exists */
  52         break;
  53     case 0x08:   /* Query Free Extended Memory */
  54     {
  55         MEMMANINFO mmi;
  56
  57         TRACE("query free extended memory\n");
  58         mmi.dwSize = sizeof(mmi);
  59         MemManInfo16(&mmi);
  60         AX_reg(context) = mmi.dwLargestFreeBlock >> 10;
  61             DX_reg(context) = (mmi.dwFreePages * VIRTUAL_GetPageSize()) >> 10;
  62         TRACE("returning largest %dK, total %dK\n", AX_reg(context), DX_reg(context));
  63     }
  64     break;
  65     case 0x09:   /* Allocate Extended Memory Block */
  66         TRACE("allocate extended memory block (%dK)\n",
  67             DX_reg(context));
  68         DX_reg(context) = GlobalAlloc16(GMEM_MOVEABLE,
  69             (DWORD)DX_reg(context)<<10);
  70         AX_reg(context) = DX_reg(context) ? 1 : 0;
  71         if (!DX_reg(context)) BL_reg(context) = 0xA0; /* out of memory */
  72         break;
  73     case 0x0a:   /* Free Extended Memory Block */
  74         TRACE("free extended memory block %04x\n",DX_reg(context));
  75         GlobalFree16(DX_reg(context));
  76         break;
  77     case 0x0b:   /* Move Extended Memory Block */
  78     {
  79         MOVESTRUCT*move=CTX_SEG_OFF_TO_LIN(context,
  80             context->SegDs,context->Esi);
  81         BYTE*src,*dst;
  82         TRACE("move extended memory block\n");
  83         src=XMS_Offset(&move->Source);
  84         dst=XMS_Offset(&move->Dest);
  85         memcpy(dst,src,move->Length);
  86         if (move->Source.Handle) GlobalUnlock16(move->Source.Handle);
  87         if (move->Dest.Handle) GlobalUnlock16(move->Dest.Handle);
  88         break;
  89     }
  90     default:
  91         INT_BARF( context, 0x31 );
  92         AX_reg(context) = 0x0000; /* failure */
  93         BL_reg(context) = 0x80;   /* function not implemented */
  94         break;
  95     }
  96 }