260 lines
8.5 KiB
C
260 lines
8.5 KiB
C
/*
|
|
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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 "excpt.h"
|
|
#include "winternl.h"
|
|
#include "wine/winbase16.h"
|
|
|
|
#include "kernel_private.h"
|
|
#include "toolhelp.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
|
|
|
|
/* 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're still in PM
|
|
* mode, accessing part of the "physical" real mode memory. In fact, we don't
|
|
* map all the first meg, we keep 64k uncommitted to still catch NULL
|
|
* pointers dereference
|
|
* 3/ if the process enters the real mode, then we (also) 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;
|
|
/* number of bytes protected from _dosmem. 0 when DOS memory is initialized,
|
|
* 64k otherwise to trap NULL pointers deref */
|
|
static DWORD DOSMEM_protect;
|
|
|
|
static LONG WINAPI dosmem_handler(EXCEPTION_POINTERS* except);
|
|
|
|
struct winedos_exports winedos;
|
|
|
|
BOOL load_winedos(void)
|
|
{
|
|
static HANDLE hRunOnce /* = 0 */;
|
|
static HMODULE hWineDos /* = 0 */;
|
|
|
|
/* FIXME: this isn't 100% thread safe, as we won't catch access to 1MB while
|
|
* loading winedos (and may return uninitialized valued)
|
|
*/
|
|
if (hWineDos) goto done;
|
|
if (hRunOnce == 0)
|
|
{
|
|
HANDLE hEvent = CreateEventW( NULL, TRUE, FALSE, NULL );
|
|
if (InterlockedCompareExchangePointer( (PVOID)&hRunOnce, hEvent, 0 ) == 0)
|
|
{
|
|
HMODULE hModule;
|
|
|
|
/* ok, we're the winning thread */
|
|
if (!VirtualProtect( DOSMEM_dosmem + DOSMEM_protect,
|
|
DOSMEM_SIZE - DOSMEM_protect,
|
|
PAGE_READWRITE, NULL ) ||
|
|
!(hModule = LoadLibraryA( "winedos.dll" )))
|
|
{
|
|
ERR("Could not load winedos.dll, DOS subsystem unavailable\n");
|
|
hModule = (HMODULE)1; /* not to try to load it again */
|
|
}
|
|
else
|
|
{
|
|
#define GET_ADDR(func) winedos.func = (void *)GetProcAddress( hModule, #func );
|
|
GET_ADDR(AllocDosBlock);
|
|
GET_ADDR(FreeDosBlock);
|
|
GET_ADDR(ResizeDosBlock);
|
|
GET_ADDR(inport);
|
|
GET_ADDR(outport);
|
|
GET_ADDR(EmulateInterruptPM);
|
|
GET_ADDR(CallBuiltinHandler);
|
|
GET_ADDR(BiosTick);
|
|
#undef GET_ADDR
|
|
}
|
|
RtlRemoveVectoredExceptionHandler( dosmem_handler );
|
|
hWineDos = hModule;
|
|
SetEvent( hRunOnce );
|
|
goto done;
|
|
}
|
|
/* someone beat us here... */
|
|
CloseHandle( hEvent );
|
|
}
|
|
|
|
/* and wait for the winner to have finished */
|
|
WaitForSingleObject( hRunOnce, INFINITE );
|
|
done:
|
|
return (hWineDos != (HMODULE)1);
|
|
}
|
|
|
|
/******************************************************************
|
|
* 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_dosmem + DOSMEM_protect &&
|
|
addr < (ULONG_PTR)DOSMEM_dosmem + DOSMEM_SIZE)
|
|
{
|
|
if (load_winedos()) return EXCEPTION_CONTINUE_EXECUTION;
|
|
}
|
|
}
|
|
return EXCEPTION_CONTINUE_SEARCH;
|
|
}
|
|
|
|
/**********************************************************************
|
|
* setup_dos_mem
|
|
*
|
|
* Setup the first megabyte for DOS memory access
|
|
*/
|
|
static char* 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, 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, PROT_NONE, 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;
|
|
RtlAddVectoredExceptionHandler(FALSE, dosmem_handler);
|
|
return (char*)addr + sys_offset;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* DOSMEM_Init
|
|
*
|
|
* Create the dos memory segments, and store them into the KERNEL
|
|
* exported values.
|
|
*/
|
|
BOOL DOSMEM_Init(void)
|
|
{
|
|
char* sysmem = setup_dos_mem();
|
|
|
|
DOSMEM_0000H = GLOBAL_CreateBlock( GMEM_FIXED, sysmem,
|
|
DOSMEM_64KB, 0, WINE_LDT_FLAGS_DATA );
|
|
DOSMEM_BiosDataSeg = GLOBAL_CreateBlock( GMEM_FIXED, 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_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 (char *)ptr - 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 DOSMEM_dosmem + ptr;
|
|
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;
|
|
}
|