| /* |
| * 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 "kernel16_private.h" |
| #include "dosexe.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 |
| |
| /* |
| * Memory Control Block (MCB) definition |
| * FIXME: implement Allocation Strategy |
| */ |
| |
| #define MCB_DUMP(mc) \ |
| TRACE ("MCB_DUMP base=%p type=%02xh psp=%04xh size=%04xh\n", mc, mc->type, mc->psp , mc->size ) |
| |
| #define MCB_NEXT(mc) \ |
| (MCB*) ((mc->type==MCB_TYPE_LAST) ? NULL : (char*)(mc) + ((mc->size + 1) << 4) ) |
| |
| /* FIXME: should we check more? */ |
| #define MCB_VALID(mc) \ |
| ((mc->type==MCB_TYPE_NORMAL) || (mc->type==MCB_TYPE_LAST)) |
| |
| |
| #define MCB_TYPE_NORMAL 0x4d |
| #define MCB_TYPE_LAST 0x5a |
| |
| #define MCB_PSP_DOS 0x0060 |
| #define MCB_PSP_FREE 0 |
| |
| #include "pshpack1.h" |
| typedef struct { |
| BYTE type; |
| WORD psp; /* segment of owner psp */ |
| WORD size; /* in paragraphs */ |
| BYTE pad[3]; |
| BYTE name[8]; |
| } MCB; |
| #include "poppack.h" |
| |
| /* |
| #define __DOSMEM_DEBUG__ |
| */ |
| |
| #define VM_STUB(x) (0x90CF00CD|(x<<8)) /* INT x; IRET; NOP */ |
| #define VM_STUB_SEGMENT 0xf000 /* BIOS segment */ |
| |
| /* FIXME: this should be moved to the LOL */ |
| static MCB* DOSMEM_root_block; |
| |
| /* 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; |
| 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 LONG WINAPI dosmem_handler(EXCEPTION_POINTERS* except); |
| static void *vectored_handler; |
| |
| /*********************************************************************** |
| * 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); |
| } |
| |
| BIOSDATA* DOSVM_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) |
| { |
| BYTE *pBiosSys = (BYTE*)DOSMEM_dosmem + 0xf0000; |
| BYTE *pBiosROMTable = pBiosSys+0xe6f5; |
| BIOSDATA *pBiosData = DOSVM_BiosData(); |
| static const char bios_date[] = "13/01/99"; |
| |
| /* 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 */ |
| memcpy(pBiosSys+0xfff5, bios_date, sizeof bios_date); |
| |
| /* BIOS ID */ |
| *(pBiosSys+0xfffe) = 0xfc; |
| |
| /* Reboot vector (f000:fff0 or ffff:0000) */ |
| *(DWORD*)(pBiosSys + 0xfff0) = VM_STUB(0x19); |
| } |
| |
| /*********************************************************************** |
| * BiosTick |
| * |
| * Increment the BIOS tick counter. Called by timer signal handler. |
| */ |
| static void CALLBACK BiosTick( LPVOID arg, DWORD low, DWORD high ) |
| { |
| BIOSDATA *pBiosData = arg; |
| pBiosData->Ticks++; |
| } |
| |
| /*********************************************************************** |
| * timer_thread |
| */ |
| static DWORD CALLBACK timer_thread( void *arg ) |
| { |
| LARGE_INTEGER when; |
| HANDLE timer; |
| |
| if (!(timer = CreateWaitableTimerA( NULL, FALSE, NULL ))) return 0; |
| |
| when.u.LowPart = when.u.HighPart = 0; |
| SetWaitableTimer( timer, &when, 55 /* actually 54.925 */, BiosTick, arg, FALSE ); |
| for (;;) SleepEx( INFINITE, TRUE ); |
| } |
| |
| /*********************************************************************** |
| * DOSVM_start_bios_timer |
| * |
| * Start the BIOS ticks timer when the app accesses selector 0x40. |
| */ |
| void DOSVM_start_bios_timer(void) |
| { |
| static LONG running; |
| |
| if (!InterlockedExchange( &running, 1 )) |
| CloseHandle( CreateThread( NULL, 0, timer_thread, DOSVM_BiosData(), 0, NULL )); |
| } |
| |
| /*********************************************************************** |
| * DOSMEM_Collapse |
| * |
| * Helper function for internal use only. |
| * Attach all following free blocks to this one, even if this one is not free. |
| */ |
| static void DOSMEM_Collapse( MCB* mcb ) |
| { |
| MCB* next = MCB_NEXT( mcb ); |
| |
| while (next && next->psp == MCB_PSP_FREE) |
| { |
| mcb->size = mcb->size + next->size + 1; |
| mcb->type = next->type; /* make sure keeping MCB_TYPE_LAST */ |
| next = MCB_NEXT( next ); |
| } |
| } |
| |
| /****************************************************************** |
| * DOSMEM_InitDosMemory |
| */ |
| BOOL DOSMEM_InitDosMemory(void) |
| { |
| static BOOL done; |
| static HANDLE hRunOnce; |
| DWORD old_prot; |
| |
| if (done) return TRUE; |
| |
| /* FIXME: this isn't 100% thread safe, as we won't catch accesses while initializing */ |
| if (hRunOnce == 0) |
| { |
| HANDLE hEvent = CreateEventW( NULL, TRUE, FALSE, NULL ); |
| if (InterlockedCompareExchangePointer( &hRunOnce, hEvent, 0 ) == 0) |
| { |
| BOOL ret; |
| DWORD reserve; |
| |
| /* ok, we're the winning thread */ |
| if (!(ret = VirtualProtect( DOSMEM_dosmem + DOSMEM_protect, |
| DOSMEM_SIZE - DOSMEM_protect, |
| PAGE_READWRITE, &old_prot ))) |
| ERR("Cannot load access low 1Mb, DOS subsystem unavailable\n"); |
| RemoveVectoredExceptionHandler( vectored_handler ); |
| |
| /* |
| * 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 = 0x10000; /* 64k */ |
| else |
| reserve = 0x600; /* 1.5k */ |
| |
| /* |
| * Set DOS memory base and initialize conventional memory. |
| */ |
| DOSMEM_FillBiosSegments(); |
| DOSMEM_FillIsrTable(); |
| |
| /* align root block to paragraph */ |
| DOSMEM_root_block = (MCB*)(DOSMEM_dosmem + reserve); |
| DOSMEM_root_block->type = MCB_TYPE_LAST; |
| DOSMEM_root_block->psp = MCB_PSP_FREE; |
| DOSMEM_root_block->size = (DOSMEM_dosmem + 0x9fffc - ((char*)DOSMEM_root_block)) >> 4; |
| |
| TRACE("DOS conventional memory initialized, %d bytes free.\n", |
| DOSMEM_Available()); |
| |
| DOSVM_InitSegments(); |
| |
| SetEvent( hRunOnce ); |
| done = TRUE; |
| return ret; |
| } |
| /* someone beat us here... */ |
| CloseHandle( hEvent ); |
| } |
| |
| /* and wait for the winner to have finished */ |
| WaitForSingleObject( hRunOnce, INFINITE ); |
| return 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) |
| { |
| char *addr = (char *)except->ExceptionRecord->ExceptionInformation[1]; |
| if (addr >= DOSMEM_dosmem + DOSMEM_protect && addr < DOSMEM_dosmem + DOSMEM_SIZE) |
| { |
| if (DOSMEM_InitDosMemory()) return EXCEPTION_CONTINUE_EXECUTION; |
| } |
| } |
| return EXCEPTION_CONTINUE_SEARCH; |
| } |
| |
| /*********************************************************************** |
| * DOSMEM_Init |
| * |
| * Create the dos memory segments, and store them into the KERNEL |
| * exported values. |
| */ |
| BOOL DOSMEM_Init(void) |
| { |
| void *addr = (void *)1; |
| SIZE_T size = DOSMEM_SIZE - 1; |
| |
| if (NtAllocateVirtualMemory( GetCurrentProcess(), &addr, 0, &size, |
| MEM_RESERVE | MEM_COMMIT, PAGE_NOACCESS )) |
| { |
| ERR( "Cannot allocate DOS memory\n" ); |
| ExitProcess(1); |
| } |
| |
| if (addr <= (void *)DOSMEM_64KB) |
| { |
| DOSMEM_dosmem = 0; |
| DOSMEM_protect = DOSMEM_64KB; |
| DOSMEM_sysmem = (char *)0xf0000; /* store sysmem in high addresses for now */ |
| } |
| else |
| { |
| WARN( "First megabyte not available for DOS address space.\n" ); |
| DOSMEM_dosmem = addr; |
| DOSMEM_protect = 0; |
| DOSMEM_sysmem = DOSMEM_dosmem; |
| } |
| |
| vectored_handler = AddVectoredExceptionHandler(FALSE, dosmem_handler); |
| 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_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%08x) returns %p.\n", x, lin ); |
| return lin; |
| } |
| |
| /*********************************************************************** |
| * DOSMEM_AllocBlock |
| * |
| * Carve a chunk of the DOS memory block (without selector). |
| */ |
| LPVOID DOSMEM_AllocBlock(UINT size, UINT16* pseg) |
| { |
| MCB *curr; |
| MCB *next = NULL; |
| WORD psp; |
| |
| DOSMEM_InitDosMemory(); |
| |
| curr = DOSMEM_root_block; |
| if (!(psp = DOSVM_psp)) psp = MCB_PSP_DOS; |
| |
| if (pseg) *pseg = 0; |
| |
| TRACE( "(%04xh)\n", size ); |
| |
| /* round up to paragraph */ |
| size = (size + 15) >> 4; |
| |
| #ifdef __DOSMEM_DEBUG__ |
| DOSMEM_Available(); /* checks the whole MCB list */ |
| #endif |
| |
| /* loop over all MCB and search the next large enough MCB */ |
| while (curr) |
| { |
| if (!MCB_VALID (curr)) |
| { |
| ERR( "MCB List Corrupt\n" ); |
| MCB_DUMP( curr ); |
| return NULL; |
| } |
| if (curr->psp == MCB_PSP_FREE) |
| { |
| DOSMEM_Collapse( curr ); |
| /* is it large enough (one paragraph for the MCB)? */ |
| if (curr->size >= size) |
| { |
| if (curr->size > size) |
| { |
| /* split curr */ |
| next = (MCB *) ((char*) curr + ((size+1) << 4)); |
| next->psp = MCB_PSP_FREE; |
| next->size = curr->size - (size+1); |
| next->type = curr->type; |
| curr->type = MCB_TYPE_NORMAL; |
| curr->size = size; |
| } |
| /* curr is the found block */ |
| curr->psp = psp; |
| if( pseg ) *pseg = (((char*)curr) + 16 - DOSMEM_dosmem) >> 4; |
| return (LPVOID) ((char*)curr + 16); |
| } |
| } |
| curr = MCB_NEXT(curr); |
| } |
| return NULL; |
| } |
| |
| /*********************************************************************** |
| * DOSMEM_FreeBlock |
| */ |
| BOOL DOSMEM_FreeBlock(void* ptr) |
| { |
| MCB* mcb = (MCB*) ((char*)ptr - 16); |
| |
| TRACE( "(%p)\n", ptr ); |
| |
| #ifdef __DOSMEM_DEBUG__ |
| DOSMEM_Available(); |
| #endif |
| |
| if (!MCB_VALID (mcb)) |
| { |
| ERR( "MCB invalid\n" ); |
| MCB_DUMP( mcb ); |
| return FALSE; |
| } |
| |
| mcb->psp = MCB_PSP_FREE; |
| DOSMEM_Collapse( mcb ); |
| return TRUE; |
| } |
| |
| /*********************************************************************** |
| * 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. |
| * |
| * TODO: return also biggest block size |
| */ |
| UINT DOSMEM_ResizeBlock(void *ptr, UINT size, BOOL exact) |
| { |
| MCB* mcb = (MCB*) ((char*)ptr - 16); |
| MCB* next; |
| |
| TRACE( "(%p,%04xh,%s)\n", ptr, size, exact ? "TRUE" : "FALSE" ); |
| |
| /* round up to paragraph */ |
| size = (size + 15) >> 4; |
| |
| #ifdef __DOSMEM_DEBUG__ |
| DOSMEM_Available(); |
| #endif |
| |
| if (!MCB_VALID (mcb)) |
| { |
| ERR( "MCB invalid\n" ); |
| MCB_DUMP( mcb ); |
| return -1; |
| } |
| |
| /* resize needed? */ |
| if (mcb->size == size) |
| return size << 4; |
| |
| /* collapse free blocks */ |
| DOSMEM_Collapse( mcb ); |
| |
| /* shrink mcb ? */ |
| if (mcb->size > size) |
| { |
| next = (MCB *) ((char*)mcb + ((size+1) << 4)); |
| next->type = mcb->type; |
| next->psp = MCB_PSP_FREE; |
| next->size = mcb->size - (size+1); |
| mcb->type = MCB_TYPE_NORMAL; |
| mcb->size = size; |
| return size << 4; |
| } |
| |
| if (!exact) |
| { |
| return mcb->size << 4; |
| } |
| |
| return -1; |
| } |
| |
| /*********************************************************************** |
| * DOSMEM_Available |
| */ |
| UINT DOSMEM_Available(void) |
| { |
| UINT available = 0; |
| UINT total = 0; |
| MCB *curr = DOSMEM_root_block; |
| /* loop over all MCB and search the largest free MCB */ |
| while (curr) |
| { |
| #ifdef __DOSMEM_DEBUG__ |
| MCB_DUMP( curr ); |
| #endif |
| if (!MCB_VALID (curr)) |
| { |
| ERR( "MCB List Corrupt\n" ); |
| MCB_DUMP( curr ); |
| return 0; |
| } |
| if (curr->psp == MCB_PSP_FREE && |
| curr->size > available ) |
| available = curr->size; |
| |
| total += curr->size + 1; |
| curr = MCB_NEXT( curr ); |
| } |
| TRACE( " %04xh of %04xh paragraphs available\n", available, total ); |
| return available << 4; |
| } |
| |
| /****************************************************************** |
| * DOSMEM_MapDosLayout |
| * |
| * Initialize the first MB of memory to look like a real DOS setup |
| */ |
| BOOL DOSMEM_MapDosLayout(void) |
| { |
| static BOOL already_mapped; |
| DWORD old_prot; |
| |
| if (!already_mapped) |
| { |
| if (DOSMEM_dosmem || !VirtualProtect( NULL, DOSMEM_SIZE, PAGE_EXECUTE_READWRITE, &old_prot )) |
| { |
| ERR( "Need full access to the first megabyte for DOS mode\n" ); |
| ExitProcess(1); |
| } |
| /* 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 = TRUE; |
| } |
| return TRUE; |
| } |
