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236 lines
7.7 KiB
C
236 lines
7.7 KiB
C
/*
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* DOS memory emulation
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*
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* Copyright 1995 Alexandre Julliard
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* Copyright 1996 Marcus Meissner
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <signal.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#ifdef HAVE_SYS_MMAN_H
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# include <sys/mman.h>
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#endif
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#include "windef.h"
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#include "winbase.h"
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#include "excpt.h"
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#include "winternl.h"
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#include "wine/winbase16.h"
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#include "kernel_private.h"
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#include "kernel16_private.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(dosmem);
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WINE_DECLARE_DEBUG_CHANNEL(selector);
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WORD DOSMEM_0000H; /* segment at 0:0 */
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WORD DOSMEM_BiosDataSeg; /* BIOS data segment at 0x40:0 */
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WORD DOSMEM_BiosSysSeg; /* BIOS ROM segment at 0xf000:0 */
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/* DOS memory highest address (including HMA) */
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#define DOSMEM_SIZE 0x110000
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#define DOSMEM_64KB 0x10000
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/* when looking at DOS and real mode memory, we activate in three different
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* modes, depending the situation.
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* 1/ By default (protected mode), the first MB of memory (actually 0x110000,
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* when you also look at the HMA part) is always reserved, whatever you do.
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* We allocated some PM selectors to this memory, even if this area is not
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* committed at startup
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* 2/ if a program tries to use the memory through the selectors, we actually
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* commit this memory, made of: BIOS segment, but also some system
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* information, usually low in memory that we map for the circumstance also
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* in the BIOS segment, so that we keep the low memory protected (for NULL
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* pointer deref catching for example). In this case, we're still in PM
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* mode, accessing part of the "physical" real mode memory. In fact, we don't
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* map all the first meg, we keep 64k uncommitted to still catch NULL
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* pointers dereference
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* 3/ if the process enters the real mode, then we (also) commit the full first
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* MB of memory (and also initialize the DOS structures in it).
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*/
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/* DOS memory base (linear in process address space) */
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static char *DOSMEM_dosmem;
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/* number of bytes protected from _dosmem. 0 when DOS memory is initialized,
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* 64k otherwise to trap NULL pointers deref */
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static DWORD DOSMEM_protect;
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static LONG WINAPI dosmem_handler(EXCEPTION_POINTERS* except);
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struct winedos_exports winedos;
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BOOL load_winedos(void)
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{
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static HANDLE hRunOnce /* = 0 */;
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static HMODULE hWineDos /* = 0 */;
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/* FIXME: this isn't 100% thread safe, as we won't catch access to 1MB while
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* loading winedos (and may return uninitialized valued)
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*/
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if (hWineDos) goto done;
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if (hRunOnce == 0)
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{
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HANDLE hEvent = CreateEventW( NULL, TRUE, FALSE, NULL );
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if (InterlockedCompareExchangePointer( &hRunOnce, hEvent, 0 ) == 0)
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{
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HMODULE hModule;
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/* ok, we're the winning thread */
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if (!VirtualProtect( DOSMEM_dosmem + DOSMEM_protect,
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DOSMEM_SIZE - DOSMEM_protect,
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PAGE_READWRITE, NULL ) ||
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!(hModule = LoadLibraryA( "winedos.dll" )))
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{
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ERR("Could not load winedos.dll, DOS subsystem unavailable\n");
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hModule = (HMODULE)1; /* not to try to load it again */
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}
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else
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{
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#define GET_ADDR(func) winedos.func = (void *)GetProcAddress( hModule, #func );
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GET_ADDR(AllocDosBlock);
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GET_ADDR(FreeDosBlock);
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GET_ADDR(ResizeDosBlock);
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GET_ADDR(inport);
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GET_ADDR(outport);
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GET_ADDR(EmulateInterruptPM);
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GET_ADDR(CallBuiltinHandler);
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#undef GET_ADDR
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}
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RtlRemoveVectoredExceptionHandler( dosmem_handler );
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hWineDos = hModule;
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SetEvent( hRunOnce );
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goto done;
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}
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/* someone beat us here... */
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CloseHandle( hEvent );
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}
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/* and wait for the winner to have finished */
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WaitForSingleObject( hRunOnce, INFINITE );
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done:
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return (hWineDos != (HMODULE)1);
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}
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/******************************************************************
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* dosmem_handler
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*
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* Handler to catch access to our 1MB address space reserved for real memory
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*/
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static LONG WINAPI dosmem_handler(EXCEPTION_POINTERS* except)
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{
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if (except->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
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{
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char *addr = (char *)except->ExceptionRecord->ExceptionInformation[1];
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if (addr >= DOSMEM_dosmem + DOSMEM_protect && addr < DOSMEM_dosmem + DOSMEM_SIZE)
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{
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if (load_winedos()) return EXCEPTION_CONTINUE_EXECUTION;
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}
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}
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return EXCEPTION_CONTINUE_SEARCH;
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}
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/***********************************************************************
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* DOSMEM_Init
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*
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* Create the dos memory segments, and store them into the KERNEL
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* exported values.
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*/
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BOOL DOSMEM_Init(void)
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{
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char *sysmem;
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void *addr = (void *)1;
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SIZE_T size = DOSMEM_SIZE - 1;
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if (NtAllocateVirtualMemory( GetCurrentProcess(), &addr, 0, &size,
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MEM_RESERVE | MEM_COMMIT, PAGE_NOACCESS ))
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{
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ERR( "Cannot allocate DOS memory\n" );
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ExitProcess(1);
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}
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if (addr <= (void *)DOSMEM_64KB)
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{
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DOSMEM_dosmem = 0;
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DOSMEM_protect = DOSMEM_64KB;
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sysmem = (char *)0xf0000; /* store sysmem in high addresses for now */
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}
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else
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{
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WARN( "First megabyte not available for DOS address space.\n" );
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DOSMEM_dosmem = addr;
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DOSMEM_protect = 0;
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sysmem = DOSMEM_dosmem;
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}
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RtlAddVectoredExceptionHandler(FALSE, dosmem_handler);
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DOSMEM_0000H = GLOBAL_CreateBlock( GMEM_FIXED, sysmem,
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DOSMEM_64KB, 0, WINE_LDT_FLAGS_DATA );
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DOSMEM_BiosDataSeg = GLOBAL_CreateBlock( GMEM_FIXED, sysmem + 0x400,
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0x100, 0, WINE_LDT_FLAGS_DATA );
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DOSMEM_BiosSysSeg = GLOBAL_CreateBlock( GMEM_FIXED, DOSMEM_dosmem + 0xf0000,
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DOSMEM_64KB, 0, WINE_LDT_FLAGS_DATA );
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return TRUE;
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}
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/***********************************************************************
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* DOSMEM_MapLinearToDos
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*
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* Linear address to the DOS address space.
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*/
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UINT DOSMEM_MapLinearToDos(LPVOID ptr)
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{
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if (((char*)ptr >= DOSMEM_dosmem) &&
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((char*)ptr < DOSMEM_dosmem + DOSMEM_SIZE))
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return (char *)ptr - DOSMEM_dosmem;
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return (UINT)ptr;
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}
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/***********************************************************************
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* DOSMEM_MapDosToLinear
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*
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* DOS linear address to the linear address space.
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*/
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LPVOID DOSMEM_MapDosToLinear(UINT ptr)
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{
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if (ptr < DOSMEM_SIZE) return DOSMEM_dosmem + ptr;
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return (LPVOID)ptr;
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}
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/***********************************************************************
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* DOSMEM_MapRealToLinear
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*
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* Real mode DOS address into a linear pointer
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*/
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LPVOID DOSMEM_MapRealToLinear(DWORD x)
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{
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LPVOID lin;
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lin = DOSMEM_dosmem + HIWORD(x) * 16 + LOWORD(x);
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TRACE_(selector)("(0x%08x) returns %p.\n", x, lin );
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return lin;
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}
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