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/*
* DOS memory emulation
*
* Copyright 1995 Alexandre Julliard
* Copyright 1996 Marcus Meissner
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "wine/port.h"
#include <signal.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#ifdef HAVE_SYS_MMAN_H
# include <sys/mman.h>
#endif
#include "windef.h"
#include "winbase.h"
#include "winreg.h"
#include "excpt.h"
#include "winternl.h"
#include "wine/winbase16.h"
#include "kernel_private.h"
#include "toolhelp.h"
#include "miscemu.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(dosmem);
WINE_DECLARE_DEBUG_CHANNEL(selector);
WORD DOSMEM_0000H; /* segment at 0:0 */
WORD DOSMEM_BiosDataSeg; /* BIOS data segment at 0x40:0 */
WORD DOSMEM_BiosSysSeg; /* BIOS ROM segment at 0xf000:0 */
/* DOS memory highest address (including HMA) */
#define DOSMEM_SIZE 0x110000
#define DOSMEM_64KB 0x10000
/* use 2 low bits of 'size' for the housekeeping */
#define DM_BLOCK_DEBUG 0xABE00000
#define DM_BLOCK_TERMINAL 0x00000001
#define DM_BLOCK_FREE 0x00000002
#define DM_BLOCK_MASK 0x001FFFFC
/*
#define __DOSMEM_DEBUG__
*/
typedef struct {
unsigned size;
} dosmem_entry;
typedef struct {
unsigned blocks;
unsigned free;
} dosmem_info;
#define NEXT_BLOCK(block) \
(dosmem_entry*)(((char*)(block)) + \
sizeof(dosmem_entry) + ((block)->size & DM_BLOCK_MASK))
#define VM_STUB(x) (0x90CF00CD|(x<<8)) /* INT x; IRET; NOP */
#define VM_STUB_SEGMENT 0xf000 /* BIOS segment */
/* when looking at DOS and real mode memory, we activate in three different
* modes, depending the situation.
* 1/ By default (protected mode), the first MB of memory (actually 0x110000,
* when you also look at the HMA part) is always reserved, whatever you do.
* We allocated some PM selectors to this memory, even if this area is not
* committed at startup
* 2/ if a program tries to use the memory through the selectors, we actually
* commit this memory, made of: BIOS segment, but also some system
* information, usually low in memory that we map for the circumstance also
* in the BIOS segment, so that we keep the low memory protected (for NULL
* pointer deref catching for example). In this case, we'res still in PM
* mode, accessing part of the "physicale" real mode memory.
* 3/ if the process enters the real mode, then we commit the full first MB of
* memory (and also initialize the DOS structures in it).
*/
/* DOS memory base (linear in process address space) */
static char *DOSMEM_dosmem;
/* DOS system base (for interrupt vector table and BIOS data area)
* ...should in theory (i.e. Windows) be equal to DOSMEM_dosmem (NULL),
* but is normally set to 0xf0000 in Wine to allow trapping of NULL pointers,
* and only relocated to NULL when absolutely necessary */
static char *DOSMEM_sysmem;
/* number of bytes protected from _dosmem. 0 when DOS memory is initialized,
* 64k otherwise to trap NULL pointers deref */
static DWORD DOSMEM_protect;
static void DOSMEM_InitMemory(void);
/***********************************************************************
* DOSMEM_MemoryTop
*
* Gets the DOS memory top.
*/
static char *DOSMEM_MemoryTop(void)
{
return DOSMEM_dosmem+0x9FFFC; /* 640K */
}
/***********************************************************************
* DOSMEM_InfoBlock
*
* Gets the DOS memory info block.
*/
static dosmem_info *DOSMEM_InfoBlock(void)
{
/* Start of DOS conventional memory */
static char *DOSMEM_membase;
if (!DOSMEM_membase)
{
DWORD reserve;
/*
* Reserve either:
* - lowest 64k for NULL pointer catching (Win16)
* - lowest 1k for interrupt handlers and
* another 0.5k for BIOS, DOS and intra-application
* areas (DOS)
*/
if (DOSMEM_dosmem != DOSMEM_sysmem)
reserve = DOSMEM_64KB;
else
reserve = 0x600; /* 1.5k */
/*
* Round to paragraph boundary in order to make
* sure the alignment is correct.
*/
reserve = ((reserve + 15) >> 4) << 4;
/*
* Set DOS memory base and initialize conventional memory.
*/
DOSMEM_membase = DOSMEM_dosmem + reserve;
DOSMEM_InitMemory();
}
return (dosmem_info*)DOSMEM_membase;
}
/***********************************************************************
* DOSMEM_RootBlock
*
* Gets the DOS memory root block.
*/
static dosmem_entry *DOSMEM_RootBlock(void)
{
/* first block has to be paragraph-aligned */
return (dosmem_entry*)(((char*)DOSMEM_InfoBlock()) +
((((sizeof(dosmem_info) + 0xf) & ~0xf) - sizeof(dosmem_entry))));
}
/***********************************************************************
* DOSMEM_FillIsrTable
*
* Fill the interrupt table with fake BIOS calls to BIOSSEG (0xf000).
*
* NOTES:
* Linux normally only traps INTs performed from or destined to BIOSSEG
* for us to handle, if the int_revectored table is empty. Filling the
* interrupt table with calls to INT stubs in BIOSSEG allows DOS programs
* to hook interrupts, as well as use their familiar retf tricks to call
* them, AND let Wine handle any unhooked interrupts transparently.
*/
static void DOSMEM_FillIsrTable(void)
{
SEGPTR *isr = (SEGPTR*)DOSMEM_sysmem;
int x;
for (x=0; x<256; x++) isr[x]=MAKESEGPTR(VM_STUB_SEGMENT,x*4);
}
static void DOSMEM_MakeIsrStubs(void)
{
DWORD *stub = (DWORD*)(DOSMEM_dosmem + (VM_STUB_SEGMENT << 4));
int x;
for (x=0; x<256; x++) stub[x]=VM_STUB(x);
}
static BIOSDATA * DOSMEM_BiosData(void)
{
return (BIOSDATA *)(DOSMEM_sysmem + 0x400);
}
/**********************************************************************
* DOSMEM_GetTicksSinceMidnight
*
* Return number of clock ticks since midnight.
*/
static DWORD DOSMEM_GetTicksSinceMidnight(void)
{
SYSTEMTIME time;
/* This should give us the (approximately) correct
* 18.206 clock ticks per second since midnight.
*/
GetLocalTime( &time );
return (((time.wHour * 3600 + time.wMinute * 60 +
time.wSecond) * 18206) / 1000) +
(time.wMilliseconds * 1000 / 54927);
}
/***********************************************************************
* DOSMEM_FillBiosSegments
*
* Fill the BIOS data segment with dummy values.
*/
static void DOSMEM_FillBiosSegments(void)
{
char *pBiosSys = DOSMEM_dosmem + 0xf0000;
BYTE *pBiosROMTable = pBiosSys+0xe6f5;
BIOSDATA *pBiosData = DOSMEM_BiosData();
/* Clear all unused values */
memset( pBiosData, 0, sizeof(*pBiosData) );
/* FIXME: should check the number of configured drives and ports */
pBiosData->Com1Addr = 0x3f8;
pBiosData->Com2Addr = 0x2f8;
pBiosData->Lpt1Addr = 0x378;
pBiosData->Lpt2Addr = 0x278;
pBiosData->InstalledHardware = 0x5463;
pBiosData->MemSize = 640;
pBiosData->NextKbdCharPtr = 0x1e;
pBiosData->FirstKbdCharPtr = 0x1e;
pBiosData->VideoMode = 3;
pBiosData->VideoColumns = 80;
pBiosData->VideoPageSize = 80 * 25 * 2;
pBiosData->VideoPageStartAddr = 0xb800;
pBiosData->VideoCtrlAddr = 0x3d4;
pBiosData->Ticks = DOSMEM_GetTicksSinceMidnight();
pBiosData->NbHardDisks = 2;
pBiosData->KbdBufferStart = 0x1e;
pBiosData->KbdBufferEnd = 0x3e;
pBiosData->RowsOnScreenMinus1 = 24;
pBiosData->BytesPerChar = 0x10;
pBiosData->ModeOptions = 0x64;
pBiosData->FeatureBitsSwitches = 0xf9;
pBiosData->VGASettings = 0x51;
pBiosData->DisplayCombination = 0x08;
pBiosData->DiskDataRate = 0;
/* fill ROM configuration table (values from Award) */
*(pBiosROMTable+0x0) = 0x08; /* number of bytes following LO */
*(pBiosROMTable+0x1) = 0x00; /* number of bytes following HI */
*(pBiosROMTable+0x2) = 0xfc; /* model */
*(pBiosROMTable+0x3) = 0x01; /* submodel */
*(pBiosROMTable+0x4) = 0x00; /* BIOS revision */
*(pBiosROMTable+0x5) = 0x74; /* feature byte 1 */
*(pBiosROMTable+0x6) = 0x00; /* feature byte 2 */
*(pBiosROMTable+0x7) = 0x00; /* feature byte 3 */
*(pBiosROMTable+0x8) = 0x00; /* feature byte 4 */
*(pBiosROMTable+0x9) = 0x00; /* feature byte 5 */
/* BIOS date string */
strcpy(pBiosSys+0xfff5, "13/01/99");
/* BIOS ID */
*(pBiosSys+0xfffe) = 0xfc;
/* Reboot vector (f000:fff0 or ffff:0000) */
*(DWORD*)(pBiosSys + 0xfff0) = VM_STUB(0x19);
}
/***********************************************************************
* DOSMEM_InitMemory
*
* Initialises the DOS memory structures.
*/
static void DOSMEM_InitMemory(void)
{
dosmem_info* info_block = DOSMEM_InfoBlock();
dosmem_entry* root_block = DOSMEM_RootBlock();
dosmem_entry* dm;
root_block->size = DOSMEM_MemoryTop() - (((char*)root_block) + sizeof(dosmem_entry));
info_block->blocks = 0;
info_block->free = root_block->size;
dm = NEXT_BLOCK(root_block);
dm->size = DM_BLOCK_TERMINAL;
root_block->size |= DM_BLOCK_FREE
#ifdef __DOSMEM_DEBUG__
| DM_BLOCK_DEBUG
#endif
;
TRACE( "DOS conventional memory initialized, %d bytes free.\n",
DOSMEM_Available() );
}
static void dosmem_bios_init(void)
{
static int bios_created;
if (!bios_created)
{
DOSMEM_FillBiosSegments();
DOSMEM_FillIsrTable();
bios_created = TRUE;
}
}
/******************************************************************
* dosmem_handler
*
* Handler to catch access to our 1MB address space reserved for real memory
*/
static LONG WINAPI dosmem_handler(EXCEPTION_POINTERS* except)
{
if (except->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
{
DWORD addr = except->ExceptionRecord->ExceptionInformation[1];
if (addr >= (ULONG_PTR)DOSMEM_sysmem &&
addr < (ULONG_PTR)DOSMEM_sysmem + DOSMEM_64KB)
{
VirtualProtect( DOSMEM_sysmem, DOSMEM_64KB, PAGE_EXECUTE_READWRITE, NULL );
dosmem_bios_init();
return EXCEPTION_CONTINUE_EXECUTION;
}
if (addr >= (ULONG_PTR)DOSMEM_dosmem + DOSMEM_protect &&
addr < (ULONG_PTR)DOSMEM_dosmem + DOSMEM_SIZE)
{
VirtualProtect( DOSMEM_dosmem + DOSMEM_protect, DOSMEM_SIZE - DOSMEM_protect,
PAGE_EXECUTE_READWRITE, NULL );
dosmem_bios_init();
return EXCEPTION_CONTINUE_EXECUTION;
}
}
return EXCEPTION_CONTINUE_SEARCH;
}
/**********************************************************************
* setup_dos_mem
*
* Setup the first megabyte for DOS memory access
*/
static void setup_dos_mem(void)
{
int sys_offset = 0;
int page_size = getpagesize();
void *addr = NULL;
if (wine_mmap_is_in_reserved_area( NULL, DOSMEM_SIZE ) != 1)
{
addr = wine_anon_mmap( (void *)page_size, DOSMEM_SIZE-page_size,
PROT_READ | PROT_WRITE | PROT_EXEC, 0 );
if (addr == (void *)page_size) addr = NULL; /* we got what we wanted */
else munmap( addr, DOSMEM_SIZE - page_size );
}
if (!addr)
{
/* now reserve from address 0 */
wine_anon_mmap( NULL, DOSMEM_SIZE, 0, MAP_FIXED );
/* inform the memory manager that there is a mapping here, but don't commit yet */
VirtualAlloc( NULL, DOSMEM_SIZE, MEM_RESERVE | MEM_SYSTEM, PAGE_NOACCESS );
sys_offset = 0xf0000;
DOSMEM_protect = DOSMEM_64KB;
}
else
{
ERR("Cannot use first megabyte for DOS address space, please report\n" );
/* allocate the DOS area somewhere else */
addr = VirtualAlloc( NULL, DOSMEM_SIZE, MEM_RESERVE, PAGE_NOACCESS );
if (!addr)
{
ERR( "Cannot allocate DOS memory\n" );
ExitProcess(1);
}
}
DOSMEM_dosmem = addr;
DOSMEM_sysmem = (char*)addr + sys_offset;
RtlAddVectoredExceptionHandler(FALSE, dosmem_handler);
}
/***********************************************************************
* DOSMEM_Init
*
* Create the dos memory segments, and store them into the KERNEL
* exported values.
*/
BOOL DOSMEM_Init(void)
{
setup_dos_mem();
DOSMEM_0000H = GLOBAL_CreateBlock( GMEM_FIXED, DOSMEM_sysmem,
DOSMEM_64KB, 0, WINE_LDT_FLAGS_DATA );
DOSMEM_BiosDataSeg = GLOBAL_CreateBlock(GMEM_FIXED,DOSMEM_sysmem + 0x400,
0x100, 0, WINE_LDT_FLAGS_DATA );
DOSMEM_BiosSysSeg = GLOBAL_CreateBlock(GMEM_FIXED,DOSMEM_dosmem + 0xf0000,
DOSMEM_64KB, 0, WINE_LDT_FLAGS_DATA );
return TRUE;
}
/******************************************************************
* DOSMEM_InitDosMem
*
* Initialize the first MB of memory to look like a real DOS setup
*/
BOOL DOSMEM_InitDosMem(void)
{
static int already_mapped;
if (!already_mapped)
{
if (DOSMEM_dosmem)
{
ERR( "Needs access to the first megabyte for DOS mode\n" );
ExitProcess(1);
}
MESSAGE( "Warning: unprotecting memory to allow real-mode calls.\n"
" NULL pointer accesses will no longer be caught.\n" );
VirtualProtect( NULL, DOSMEM_SIZE, PAGE_EXECUTE_READWRITE, NULL );
DOSMEM_protect = 0;
dosmem_bios_init();
/* copy the BIOS and ISR area down */
memcpy( DOSMEM_dosmem, DOSMEM_sysmem, 0x400 + 0x100 );
DOSMEM_sysmem = DOSMEM_dosmem;
SetSelectorBase( DOSMEM_0000H, 0 );
SetSelectorBase( DOSMEM_BiosDataSeg, 0x400 );
/* we may now need the actual interrupt stubs, and since we've just moved the
* interrupt vector table away, we can fill the area with stubs instead... */
DOSMEM_MakeIsrStubs();
already_mapped = 1;
}
return TRUE;
}
/***********************************************************************
* DOSMEM_Tick
*
* Increment the BIOS tick counter. Called by timer signal handler.
*/
void DOSMEM_Tick( WORD timer )
{
BIOSDATA *pBiosData = DOSMEM_BiosData();
if (pBiosData) pBiosData->Ticks++;
}
/***********************************************************************
* DOSMEM_GetBlock
*
* Carve a chunk of the DOS memory block (without selector).
*/
LPVOID DOSMEM_GetBlock(UINT size, UINT16* pseg)
{
UINT blocksize;
char *block = NULL;
dosmem_info *info_block = DOSMEM_InfoBlock();
dosmem_entry *dm;
#ifdef __DOSMEM_DEBUG_
dosmem_entry *prev = NULL;
#endif
if( size > info_block->free ) return NULL;
dm = DOSMEM_RootBlock();
while (dm && dm->size != DM_BLOCK_TERMINAL)
{
#ifdef __DOSMEM_DEBUG__
if( (dm->size & DM_BLOCK_DEBUG) != DM_BLOCK_DEBUG )
{
WARN("MCB overrun! [prev = 0x%08x]\n", 4 + (UINT)prev);
return NULL;
}
prev = dm;
#endif
if( dm->size & DM_BLOCK_FREE )
{
dosmem_entry *next = NEXT_BLOCK(dm);
while( next->size & DM_BLOCK_FREE ) /* collapse free blocks */
{
dm->size += sizeof(dosmem_entry) + (next->size & DM_BLOCK_MASK);
next->size = (DM_BLOCK_FREE | DM_BLOCK_TERMINAL);
next = NEXT_BLOCK(dm);
}
blocksize = dm->size & DM_BLOCK_MASK;
if( blocksize >= size )
{
block = ((char*)dm) + sizeof(dosmem_entry);
if( blocksize - size > 0x20 )
{
/* split dm so that the next one stays
* paragraph-aligned (and dm loses free bit) */
dm->size = (((size + 0xf + sizeof(dosmem_entry)) & ~0xf) -
sizeof(dosmem_entry));
next = (dosmem_entry*)(((char*)dm) +
sizeof(dosmem_entry) + dm->size);
next->size = (blocksize - (dm->size +
sizeof(dosmem_entry))) | DM_BLOCK_FREE
#ifdef __DOSMEM_DEBUG__
| DM_BLOCK_DEBUG
#endif
;
} else dm->size &= DM_BLOCK_MASK;
info_block->blocks++;
info_block->free -= dm->size;
if( pseg ) *pseg = (block - DOSMEM_dosmem) >> 4;
#ifdef __DOSMEM_DEBUG__
dm->size |= DM_BLOCK_DEBUG;
#endif
break;
}
dm = next;
}
else dm = NEXT_BLOCK(dm);
}
return (LPVOID)block;
}
/***********************************************************************
* DOSMEM_FreeBlock
*/
BOOL DOSMEM_FreeBlock(void* ptr)
{
dosmem_info *info_block = DOSMEM_InfoBlock();
if( ptr >= (void*)(((char*)DOSMEM_RootBlock()) + sizeof(dosmem_entry)) &&
ptr < (void*)DOSMEM_MemoryTop() && !((((char*)ptr)
- DOSMEM_dosmem) & 0xf) )
{
dosmem_entry *dm = (dosmem_entry*)(((char*)ptr) - sizeof(dosmem_entry));
if( !(dm->size & (DM_BLOCK_FREE | DM_BLOCK_TERMINAL))
#ifdef __DOSMEM_DEBUG__
&& ((dm->size & DM_BLOCK_DEBUG) == DM_BLOCK_DEBUG )
#endif
)
{
info_block->blocks--;
info_block->free += dm->size;
dm->size |= DM_BLOCK_FREE;
return TRUE;
}
}
return FALSE;
}
/***********************************************************************
* DOSMEM_ResizeBlock
*
* Resize DOS memory block in place. Returns block size or -1 on error.
*
* If exact is TRUE, returned value is either old or requested block
* size. If exact is FALSE, block is expanded even if there is not
* enough space for full requested block size.
*/
UINT DOSMEM_ResizeBlock(void *ptr, UINT size, BOOL exact)
{
char *block = NULL;
dosmem_info *info_block = DOSMEM_InfoBlock();
dosmem_entry *dm;
dosmem_entry *next;
UINT blocksize;
UINT orgsize;
if( (ptr < (void*)(sizeof(dosmem_entry) + (char*)DOSMEM_RootBlock())) ||
(ptr >= (void*)DOSMEM_MemoryTop()) ||
(((((char*)ptr) - DOSMEM_dosmem) & 0xf) != 0) )
return (UINT)-1;
dm = (dosmem_entry*)(((char*)ptr) - sizeof(dosmem_entry));
if( dm->size & (DM_BLOCK_FREE | DM_BLOCK_TERMINAL) )
return (UINT)-1;
next = NEXT_BLOCK(dm);
orgsize = dm->size & DM_BLOCK_MASK;
/* collapse free blocks */
while( next->size & DM_BLOCK_FREE )
{
dm->size += sizeof(dosmem_entry) + (next->size & DM_BLOCK_MASK);
next->size = (DM_BLOCK_FREE | DM_BLOCK_TERMINAL);
next = NEXT_BLOCK(dm);
}
blocksize = dm->size & DM_BLOCK_MASK;
/*
* If collapse didn't help we either expand block to maximum
* available size (exact == FALSE) or give collapsed blocks
* back to free storage (exact == TRUE).
*/
if (blocksize < size)
size = exact ? orgsize : blocksize;
block = ((char*)dm) + sizeof(dosmem_entry);
if( blocksize - size > 0x20 )
{
/*
* split dm so that the next one stays
* paragraph-aligned (and next gains free bit)
*/
dm->size = (((size + 0xf + sizeof(dosmem_entry)) & ~0xf) -
sizeof(dosmem_entry));
next = (dosmem_entry*)(((char*)dm) +
sizeof(dosmem_entry) + dm->size);
next->size = (blocksize - (dm->size +
sizeof(dosmem_entry))) | DM_BLOCK_FREE;
}
else
{
dm->size &= DM_BLOCK_MASK;
}
/*
* Adjust available memory if block size changes.
*/
info_block->free += orgsize - dm->size;
return size;
}
/***********************************************************************
* DOSMEM_Available
*/
UINT DOSMEM_Available(void)
{
UINT blocksize, available = 0;
dosmem_entry *dm;
dm = DOSMEM_RootBlock();
while (dm && dm->size != DM_BLOCK_TERMINAL)
{
#ifdef __DOSMEM_DEBUG__
if( (dm->size & DM_BLOCK_DEBUG) != DM_BLOCK_DEBUG )
{
WARN("MCB overrun! [prev = 0x%08x]\n", 4 + (UINT)prev);
return NULL;
}
prev = dm;
#endif
if( dm->size & DM_BLOCK_FREE )
{
dosmem_entry *next = NEXT_BLOCK(dm);
while( next->size & DM_BLOCK_FREE ) /* collapse free blocks */
{
dm->size += sizeof(dosmem_entry) + (next->size & DM_BLOCK_MASK);
next->size = (DM_BLOCK_FREE | DM_BLOCK_TERMINAL);
next = NEXT_BLOCK(dm);
}
blocksize = dm->size & DM_BLOCK_MASK;
if ( blocksize > available ) available = blocksize;
dm = next;
}
else dm = NEXT_BLOCK(dm);
}
return available;
}
/***********************************************************************
* DOSMEM_MapLinearToDos
*
* Linear address to the DOS address space.
*/
UINT DOSMEM_MapLinearToDos(LPVOID ptr)
{
if (((char*)ptr >= DOSMEM_dosmem) &&
((char*)ptr < DOSMEM_dosmem + DOSMEM_SIZE))
return (UINT)ptr - (UINT)DOSMEM_dosmem;
return (UINT)ptr;
}
/***********************************************************************
* DOSMEM_MapDosToLinear
*
* DOS linear address to the linear address space.
*/
LPVOID DOSMEM_MapDosToLinear(UINT ptr)
{
if (ptr < DOSMEM_SIZE) return (LPVOID)(ptr + (UINT)DOSMEM_dosmem);
return (LPVOID)ptr;
}
/***********************************************************************
* DOSMEM_MapRealToLinear
*
* Real mode DOS address into a linear pointer
*/
LPVOID DOSMEM_MapRealToLinear(DWORD x)
{
LPVOID lin;
lin = DOSMEM_dosmem + HIWORD(x) * 16 + LOWORD(x);
TRACE_(selector)("(0x%08lx) returns %p.\n", x, lin );
return lin;
}
/***********************************************************************
* DOSMEM_AllocSelector
*
* Allocates a protected mode selector for a realmode segment.
*/
WORD DOSMEM_AllocSelector(WORD realsel)
{
HMODULE16 hModule = GetModuleHandle16("KERNEL");
WORD sel;
sel=GLOBAL_CreateBlock( GMEM_FIXED, DOSMEM_dosmem+realsel*16, DOSMEM_64KB,
hModule, WINE_LDT_FLAGS_DATA );
TRACE_(selector)("(0x%04x) returns 0x%04x.\n", realsel,sel);
return sel;
}
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