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