/* * DOS memory emulation * * Copyright 1995 Alexandre Julliard * Copyright 1996 Marcus Meissner */ #include #include #include #include "winbase.h" #include "wine/winbase16.h" #include "global.h" #include "ldt.h" #include "miscemu.h" #include "vga.h" #include "dosexe.h" #include "debugtools.h" DEFAULT_DEBUG_CHANNEL(dosmem) DECLARE_DEBUG_CHANNEL(selector) HANDLE16 DOSMEM_BiosDataSeg; /* BIOS data segment at 0x40:0 */ HANDLE16 DOSMEM_BiosSysSeg; /* BIOS ROM segment at 0xf000:0 */ static char *DOSMEM_dosmem; DWORD DOSMEM_CollateTable; DWORD DOSMEM_ErrorCall; DWORD DOSMEM_ErrorBuffer; /* 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 */ /*********************************************************************** * DOSMEM_MemoryBase * * Gets the DOS memory base. */ char *DOSMEM_MemoryBase(void) { LPDOSTASK lpDosTask = MZ_Current(); if (lpDosTask && lpDosTask->img) return lpDosTask->img; else return DOSMEM_dosmem; } /*********************************************************************** * DOSMEM_MemoryTop * * Gets the DOS memory top. */ static char *DOSMEM_MemoryTop(void) { return DOSMEM_MemoryBase()+0x9FFFC; /* 640K */ } /*********************************************************************** * DOSMEM_InfoBlock * * Gets the DOS memory info block. */ static dosmem_info *DOSMEM_InfoBlock(void) { return (dosmem_info*)(DOSMEM_MemoryBase()+0x10000); /* 64K */ } /*********************************************************************** * 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_MemoryBase(); DWORD *stub = (DWORD*)((char*)isr + (VM_STUB_SEGMENT << 4)); int x; for (x=0; x<256; x++) isr[x]=PTR_SEG_OFF_TO_SEGPTR(VM_STUB_SEGMENT,x*4); for (x=0; x<256; x++) stub[x]=VM_STUB(x); } /*********************************************************************** * DOSMEM_InitDPMI * * Allocate the global DPMI RMCB wrapper. */ static void DOSMEM_InitDPMI(void) { extern UINT16 DPMI_wrap_seg; static char wrap_code[]={ 0xCD,0x31, /* int $0x31 */ 0xCB /* lret */ }; LPSTR wrapper = (LPSTR)DOSMEM_GetBlock(sizeof(wrap_code), &DPMI_wrap_seg); memcpy(wrapper, wrap_code, sizeof(wrap_code)); } BIOSDATA * DOSMEM_BiosData() { return (BIOSDATA *)(DOSMEM_MemoryBase()+0x400); } BYTE * DOSMEM_BiosSys() { return DOSMEM_MemoryBase()+0xf0000; } struct _DOS_LISTOFLISTS * DOSMEM_LOL() { return (struct _DOS_LISTOFLISTS *)DOSMEM_MapRealToLinear (PTR_SEG_OFF_TO_SEGPTR(HIWORD(DOS_LOLSeg),0)); } /*********************************************************************** * DOSMEM_FillBiosSegments * * Fill the BIOS data segment with dummy values. */ static void DOSMEM_FillBiosSegments(void) { BYTE *pBiosSys = DOSMEM_BiosSys(); BYTE *pBiosROMTable = pBiosSys+0xe6f5; BIOSDATA *pBiosData = DOSMEM_BiosData(); /* bogus 0xe0xx addresses !! Adapt int 0x10/0x1b if change needed */ VIDEOFUNCTIONALITY *pVidFunc = (VIDEOFUNCTIONALITY *)(pBiosSys+0xe000); VIDEOSTATE *pVidState = (VIDEOSTATE *)(pBiosSys+0xe010); int i; /* Clear all unused values */ memset( pBiosData, 0, sizeof(*pBiosData) ); memset( pVidFunc, 0, sizeof(*pVidFunc ) ); memset( pVidState, 0, sizeof(*pVidState) ); /* 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 = INT1A_GetTicksSinceMidnight(); pBiosData->NbHardDisks = 2; pBiosData->KbdBufferStart = 0x1e; pBiosData->KbdBufferEnd = 0x3e; pBiosData->RowsOnScreenMinus1 = 23; 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 */ for (i = 0; i < 7; i++) pVidFunc->ModeSupport[i] = 0xff; pVidFunc->ScanlineSupport = 7; pVidFunc->NumberCharBlocks = 0; pVidFunc->ActiveCharBlocks = 0; pVidFunc->MiscFlags = 0x8ff; pVidFunc->SavePointerFlags = 0x3f; pVidState->StaticFuncTable = 0xf000e000; /* FIXME: always real mode ? */ pVidState->VideoMode = pBiosData->VideoMode; /* needs updates! */ pVidState->NumberColumns = pBiosData->VideoColumns; /* needs updates! */ pVidState->RegenBufLen = 0; pVidState->RegenBufAddr = 0; for (i = 0; i < 8; i++) pVidState->CursorPos[i] = 0; pVidState->CursorType = 0x0a0b; /* start/end line */ pVidState->ActivePage = 0; pVidState->CRTCPort = 0x3da; pVidState->Port3x8 = 0; pVidState->Port3x9 = 0; pVidState->NumberRows = 23; /* number of rows - 1 */ pVidState->BytesPerChar = 0x10; pVidState->DCCActive = pBiosData->DisplayCombination; pVidState->DCCAlternate = 0; pVidState->NumberColors = 16; pVidState->NumberPages = 1; pVidState->NumberScanlines = 3; /* (0,1,2,3) = (200,350,400,480) */ pVidState->CharBlockPrimary = 0; pVidState->CharBlockSecondary = 0; pVidState->MiscFlags = (pBiosData->VGASettings & 0x0f) | ((pBiosData->ModeOptions & 1) << 4); /* cursor emulation */ pVidState->NonVGASupport = 0; pVidState->VideoMem = (pBiosData->ModeOptions & 0x60 >> 5); pVidState->SavePointerState = 0; pVidState->DisplayStatus = 4; /* BIOS date string */ strcpy((char *)pBiosSys+0xfff5, "13/01/99"); /* BIOS ID */ *(pBiosSys+0xfffe) = 0xfc; } /*********************************************************************** * DOSMEM_InitCollateTable * * Initialises the collate table (character sorting, language dependent) */ static void DOSMEM_InitCollateTable() { DWORD x; unsigned char *tbl; int i; x = GlobalDOSAlloc16(258); DOSMEM_CollateTable = MAKELONG(0,(x>>16)); tbl = DOSMEM_MapRealToLinear(DOSMEM_CollateTable); *(WORD*)tbl = 0x100; tbl += 2; for ( i = 0; i < 0x100; i++) *tbl++ = i; } /*********************************************************************** * DOSMEM_InitErrorTable * * Initialises the error tables (DOS 5+) */ static void DOSMEM_InitErrorTable() { DWORD x; char *call; /* We will use a snippet of real mode code that calls */ /* a WINE-only interrupt to handle moving the requested */ /* message into the buffer... */ /* FIXME - There is still something wrong... */ /* FIXME - Find hex values for opcodes... (On call, AX contains message number DI contains 'offset' (??) Resturn, ES:DI points to counted string ) PUSH BX MOV BX, AX MOV AX, (arbitrary subfunction number) INT (WINE-only interrupt) POP BX RET */ const int code = 4; const int buffer = 80; const int SIZE_TO_ALLOCATE = code + buffer; /* FIXME - Complete rewrite of the table system to save */ /* precious DOS space. Now, we return the 0001:???? as */ /* DOS 4+ (??, it seems to be the case in MS 7.10) treats that */ /* as a special case and programs will use the alternate */ /* interface (a farcall returned with INT 24 (AX = 0x122e, DL = */ /* 0x08) which lets us have a smaller memory footprint anyway. */ x = GlobalDOSAlloc16(SIZE_TO_ALLOCATE); DOSMEM_ErrorCall = MAKELONG(0,(x>>16)); DOSMEM_ErrorBuffer = DOSMEM_ErrorCall + code; call = DOSMEM_MapRealToLinear(DOSMEM_ErrorCall); memset(call, 0, SIZE_TO_ALLOCATE); /* Fixme - Copy assembly into buffer here */ } /*********************************************************************** * DOSMEM_InitMemory * * Initialises the DOS memory structures. */ static void DOSMEM_InitMemory(void) { /* Low 64Kb are reserved for DOS/BIOS so the useable area starts at * 1000:0000 and ends at 9FFF:FFEF. */ 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 ; } /*********************************************************************** * DOSMEM_MovePointers * * Relocates any pointers into DOS memory to a new address space. */ static void DOSMEM_MovePointers(LPVOID dest, LPVOID src, DWORD size) { unsigned long delta = (char *) dest - (char *) src; unsigned cnt; ldt_entry ent; /* relocate base addresses of any selectors pointing into memory */ for (cnt=FIRST_LDT_ENTRY_TO_ALLOC; cnt= (unsigned long)src) && \ (ent.base < ((unsigned long)src + size))) { ent.base += delta; LDT_SetEntry(cnt, &ent); } } } /*********************************************************************** * DOSMEM_Init * * Create the dos memory segments, and store them into the KERNEL * exported values. */ BOOL DOSMEM_Init(BOOL dos_init) { LPVOID base = DOSMEM_MemoryBase(); BOOL do_init = dos_init && !DOSMEM_dosmem; if (!base) { /* Allocate 1 MB dosmemory */ DOSMEM_dosmem = VirtualAlloc( NULL, 0x100000, MEM_COMMIT, PAGE_EXECUTE_READWRITE ); if (!DOSMEM_dosmem) { WARN("Could not allocate DOS memory.\n" ); return FALSE; } DOSMEM_BiosDataSeg = GLOBAL_CreateBlock(GMEM_FIXED,DOSMEM_dosmem+0x400, 0x100, 0, FALSE, FALSE, FALSE, NULL ); DOSMEM_BiosSysSeg = GLOBAL_CreateBlock(GMEM_FIXED,DOSMEM_dosmem+0xf0000, 0x10000, 0, FALSE, FALSE, FALSE, NULL ); base = DOSMEM_dosmem; do_init = TRUE; } if (do_init) { DOSMEM_FillIsrTable(); DOSMEM_FillBiosSegments(); DOSMEM_InitMemory(); DOSMEM_InitCollateTable(); DOSMEM_InitErrorTable(); DOSMEM_InitDPMI(); DOSDEV_InstallDOSDevices(); } else if (dos_init) { /* bootstrap the new V86 task with a copy of the "system" memory */ memcpy(base, DOSMEM_dosmem, 0x100000); /* then move existing selectors to it */ DOSMEM_MovePointers(base, DOSMEM_dosmem, 0x100000); } 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_MemoryBase()) >> 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_MemoryBase()) & 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 */ LPVOID DOSMEM_ResizeBlock(void* ptr, UINT size, UINT16* pseg) { char *block = NULL; dosmem_info *info_block = DOSMEM_InfoBlock(); if( ptr >= (void*)(((char*)DOSMEM_RootBlock()) + sizeof(dosmem_entry)) && ptr < (void*)DOSMEM_MemoryTop() && !((((char*)ptr) - DOSMEM_MemoryBase()) & 0xf) ) { dosmem_entry *dm = (dosmem_entry*)(((char*)ptr) - sizeof(dosmem_entry)); if( pseg ) *pseg = ((char*)ptr - DOSMEM_MemoryBase()) >> 4; if( !(dm->size & (DM_BLOCK_FREE | DM_BLOCK_TERMINAL)) ) { dosmem_entry *next = NEXT_BLOCK(dm); UINT blocksize, orgsize = dm->size & DM_BLOCK_MASK; 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 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; info_block->free += orgsize - dm->size; } else { /* the collapse didn't help, try getting a new block */ block = DOSMEM_GetBlock(size, pseg); if (block) { /* we got one, copy the old data there (we do need to, right?) */ memcpy(block, ((char*)dm) + sizeof(dosmem_entry), (sizeblocks--; info_block->free += dm->size; dm->size |= DM_BLOCK_FREE; } else { /* and Bill Gates said 640K should be enough for everyone... */ /* need to split original and collapsed blocks apart again, * and free the collapsed blocks again, before exiting */ if( blocksize - orgsize > 0x20 ) { /* split dm so that the next one stays * paragraph-aligned (and next gains free bit) */ dm->size = (((orgsize + 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; } } } } return (LPVOID)block; } /*********************************************************************** * 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_MemoryBase()) && ((char*)ptr < DOSMEM_MemoryBase() + 0x100000)) return (UINT)ptr - (UINT)DOSMEM_MemoryBase(); return (UINT)ptr; } /*********************************************************************** * DOSMEM_MapDosToLinear * * DOS linear address to the linear address space. */ LPVOID DOSMEM_MapDosToLinear(UINT ptr) { if (ptr < 0x100000) return (LPVOID)(ptr + (UINT)DOSMEM_MemoryBase()); return (LPVOID)ptr; } /*********************************************************************** * DOSMEM_MapRealToLinear * * Real mode DOS address into a linear pointer */ LPVOID DOSMEM_MapRealToLinear(DWORD x) { LPVOID lin; lin=DOSMEM_MemoryBase()+(x&0xffff)+(((x&0xffff0000)>>16)*16); TRACE_(selector)("(0x%08lx) returns 0x%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*16,0x10000, hModule,FALSE,FALSE,FALSE,NULL ); TRACE_(selector)("(0x%04x) returns 0x%04x.\n", realsel,sel); return sel; }