| /* |
| * DOS memory emulation |
| * |
| * Copyright 1995 Alexandre Julliard |
| * Copyright 1996 Marcus Meissner |
| */ |
| |
| #include <signal.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include "winbase.h" |
| #include "wine/winbase16.h" |
| #include "global.h" |
| #include "ldt.h" |
| #include "miscemu.h" |
| #include "vga.h" |
| #include "module.h" |
| #include "task.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) |
| { |
| TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() ); |
| NE_MODULE *pModule = pTask ? NE_GetPtr( pTask->hModule ) : NULL; |
| |
| GlobalUnlock16( GetCurrentTask() ); |
| if (pModule && pModule->dos_image) |
| return pModule->dos_image; |
| 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 = (BYTE *)GlobalLock16( DOSMEM_BiosSysSeg ); |
| BYTE *pBiosROMTable = pBiosSys+0xe6f5; |
| BIOSDATA *pBiosData = (BIOSDATA *)GlobalLock16( DOSMEM_BiosDataSeg ); |
| |
| /* 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<LDT_SIZE; cnt++) { |
| LDT_GetEntry(cnt, &ent); |
| if ((ent.base >= (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(HMODULE16 hModule) |
| { |
| if (!hModule) |
| { |
| /* Allocate 1 MB dosmemory |
| * - it is mostly wasted but we can use some of it to |
| * store internal translation tables, etc... |
| */ |
| 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 ); |
| DOSMEM_FillIsrTable(); |
| DOSMEM_FillBiosSegments(); |
| DOSMEM_InitMemory(); |
| DOSMEM_InitCollateTable(); |
| DOSMEM_InitErrorTable(); |
| DOSMEM_InitDPMI(); |
| DOSDEV_InstallDOSDevices(); |
| } |
| else |
| { |
| #if 0 |
| DOSMEM_FillIsrTable(hModule); |
| DOSMEM_InitMemory(hModule); |
| #else |
| LPVOID base = DOSMEM_MemoryBase(); |
| |
| /* 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); |
| #endif |
| } |
| 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), |
| (size<orgsize) ? size : orgsize); |
| /* free old block */ |
| info_block->blocks--; |
| 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; |
| } |
| |
