/* * DOS memory emulation * * Copyright 1995 Alexandre Julliard * Copyright 1996 Marcus Meissner */ #include "config.h" #include "wine/port.h" #include #include #include #include #ifdef HAVE_SYS_MMAN_H # include #endif #include "winbase.h" #include "wine/winbase16.h" #include "global.h" #include "selectors.h" #include "miscemu.h" #include "debugtools.h" DEFAULT_DEBUG_CHANNEL(dosmem); 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 */ DWORD DOSMEM_CollateTable; /* 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 */ /* DOS memory base */ 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; /* various real-mode code stubs */ WORD DOSMEM_wrap_seg; WORD DOSMEM_xms_seg; WORD DOSMEM_dpmi_seg; WORD DOSMEM_dpmi_sel; DWORD DOS_LOLSeg; /*********************************************************************** * DOSMEM_SystemBase * * Gets the virtual DOS memory base (interrupt table). */ char *DOSMEM_SystemBase(void) { return DOSMEM_sysmem; } /*********************************************************************** * DOSMEM_MemoryBase * * Gets the DOS memory base. */ char *DOSMEM_MemoryBase(void) { return DOSMEM_dosmem; } /*********************************************************************** * 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) { return (dosmem_info*)(DOSMEM_dosmem+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_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); } /*********************************************************************** * DOSMEM_InitDPMI * * Allocate the global DPMI RMCB wrapper. */ static void DOSMEM_InitDPMI(void) { LPSTR ptr; static const char wrap_code[]={ 0xCD,0x31, /* int $0x31 */ 0xCB /* lret */ }; static const char enter_xms[]= { /* XMS hookable entry point */ 0xEB,0x03, /* jmp entry */ 0x90,0x90,0x90, /* nop;nop;nop */ /* entry: */ /* real entry point */ /* for simplicity, we'll just use the same hook as DPMI below */ 0xCD,0x31, /* int $0x31 */ 0xCB /* lret */ }; static const char enter_pm[]= { 0x50, /* pushw %ax */ 0x52, /* pushw %dx */ 0x55, /* pushw %bp */ 0x89,0xE5, /* movw %sp,%bp */ /* get return CS */ 0x8B,0x56,0x08, /* movw 8(%bp),%dx */ /* just call int 31 here to get into protected mode... */ /* it'll check whether it was called from dpmi_seg... */ 0xCD,0x31, /* int $0x31 */ /* we are now in the context of a 16-bit relay call */ /* need to fixup our stack; * 16-bit relay return address will be lost, but we won't worry quite yet */ 0x8E,0xD0, /* movw %ax,%ss */ 0x66,0x0F,0xB7,0xE5, /* movzwl %bp,%esp */ /* set return CS */ 0x89,0x56,0x08, /* movw %dx,8(%bp) */ 0x5D, /* popw %bp */ 0x5A, /* popw %dx */ 0x58, /* popw %ax */ 0xCB /* lret */ }; ptr = DOSMEM_GetBlock( sizeof(wrap_code), &DOSMEM_wrap_seg ); memcpy( ptr, wrap_code, sizeof(wrap_code) ); ptr = DOSMEM_GetBlock( sizeof(enter_xms), &DOSMEM_xms_seg ); memcpy( ptr, enter_xms, sizeof(enter_xms) ); ptr = DOSMEM_GetBlock( sizeof(enter_pm), &DOSMEM_dpmi_seg ); memcpy( ptr, enter_pm, sizeof(enter_pm) ); DOSMEM_dpmi_sel = SELECTOR_AllocBlock( ptr, sizeof(enter_pm), WINE_LDT_FLAGS_CODE ); } BIOSDATA * DOSMEM_BiosData() { return (BIOSDATA *)(DOSMEM_sysmem + 0x400); } BYTE * DOSMEM_BiosSys() { return DOSMEM_dosmem+0xf0000; } /*********************************************************************** * 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() { #if 0 /* no longer used */ 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); #endif /* 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 ; } /********************************************************************** * setup_dos_mem * * Setup the first megabyte for DOS memory access */ static void setup_dos_mem( int dos_init ) { int sys_offset = 0; int page_size = getpagesize(); void *addr = wine_anon_mmap( (void *)page_size, 0x110000-page_size, PROT_READ | PROT_WRITE | PROT_EXEC, 0 ); if (addr == (void *)page_size) /* we got what we wanted */ { /* now map from address 0 */ addr = wine_anon_mmap( NULL, 0x110000, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_FIXED ); if (addr) { ERR("MAP_FIXED failed at address 0 for DOS address space\n" ); ExitProcess(1); } /* inform the memory manager that there is a mapping here */ VirtualAlloc( addr, 0x110000, MEM_RESERVE | MEM_SYSTEM, PAGE_EXECUTE_READWRITE ); /* protect the first 64K to catch NULL pointers */ if (!dos_init) { VirtualProtect( addr, 0x10000, PAGE_NOACCESS, NULL ); /* move the BIOS and ISR area from 0x00000 to 0xf0000 */ sys_offset += 0xf0000; } } else { ERR("Cannot use first megabyte for DOS address space, please report\n" ); if (dos_init) ExitProcess(1); /* allocate the DOS area somewhere else */ addr = VirtualAlloc( NULL, 0x110000, MEM_COMMIT, PAGE_EXECUTE_READWRITE ); if (!addr) { ERR( "Cannot allocate DOS memory\n" ); ExitProcess(1); } } DOSMEM_dosmem = addr; DOSMEM_sysmem = (char*)addr + sys_offset; } /*********************************************************************** * DOSMEM_Init * * Create the dos memory segments, and store them into the KERNEL * exported values. */ BOOL DOSMEM_Init(BOOL dos_init) { static int already_done, already_mapped; if (!already_done) { setup_dos_mem( dos_init ); DOSMEM_0000H = GLOBAL_CreateBlock( GMEM_FIXED, DOSMEM_sysmem, 0x10000, 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, 0x10000, 0, WINE_LDT_FLAGS_DATA ); DOSMEM_FillBiosSegments(); DOSMEM_FillIsrTable(); DOSMEM_InitMemory(); DOSMEM_InitCollateTable(); DOSMEM_InitErrorTable(); DOSMEM_InitDPMI(); already_done = 1; } else if (dos_init && !already_mapped) { if (DOSMEM_dosmem) { ERR( "Needs access to the first megabyte for DOS mode\n" ); ExitProcess(1); } MESSAGE( "Warning: unprotecting the first 64KB of memory to allow real-mode calls.\n" " NULL pointer accesses will no longer be caught.\n" ); VirtualProtect( NULL, 0x10000, PAGE_EXECUTE_READWRITE, NULL ); /* 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 */ 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_dosmem) & 0xf) ) { dosmem_entry *dm = (dosmem_entry*)(((char*)ptr) - sizeof(dosmem_entry)); if( pseg ) *pseg = ((char*)ptr - DOSMEM_dosmem) >> 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_dosmem) && ((char*)ptr < DOSMEM_dosmem + 0x100000)) 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 < 0x100000) 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+(x&0xffff)+(((x&0xffff0000)>>16)*16); 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, 0x10000, hModule, WINE_LDT_FLAGS_DATA ); TRACE_(selector)("(0x%04x) returns 0x%04x.\n", realsel,sel); return sel; }