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