/* * DOS memory emulation * * Copyright 1995 Alexandre Julliard * Copyright 1996 Marcus Meissner */ #include #include #include #include "windows.h" #include "winbase.h" #include "global.h" #include "ldt.h" #include "miscemu.h" #include "vga.h" #include "module.h" #include "task.h" #include "debug.h" HANDLE16 DOSMEM_BiosSeg; /* BIOS data segment at 0x40:0 */ #pragma pack(1) typedef struct { WORD Com1Addr; /* 00: COM1 I/O address */ WORD Com2Addr; /* 02: COM2 I/O address */ WORD Com3Addr; /* 04: COM3 I/O address */ WORD Com4Addr; /* 06: COM4 I/O address */ WORD Lpt1Addr; /* 08: LPT1 I/O address */ WORD Lpt2Addr; /* 0a: LPT2 I/O address */ WORD Lpt3Addr; /* 0c: LPT3 I/O address */ WORD Lpt4Addr; /* 0e: LPT4 I/O address */ WORD InstalledHardware; /* 10: Installed hardware flags */ BYTE POSTstatus; /* 12: Power-On Self Test status */ WORD MemSize WINE_PACKED; /* 13: Base memory size in Kb */ WORD unused1 WINE_PACKED; /* 15: Manufacturing test scratch pad */ BYTE KbdFlags1; /* 17: Keyboard flags 1 */ BYTE KbdFlags2; /* 18: Keyboard flags 2 */ BYTE unused2; /* 19: Keyboard driver workspace */ WORD NextKbdCharPtr; /* 1a: Next character in kbd buffer */ WORD FirstKbdCharPtr; /* 1c: First character in kbd buffer */ WORD KbdBuffer[16]; /* 1e: Keyboard buffer */ BYTE DisketteStatus1; /* 3e: Diskette recalibrate status */ BYTE DisketteStatus2; /* 3f: Diskette motor status */ BYTE DisketteStatus3; /* 40: Diskette motor timeout */ BYTE DisketteStatus4; /* 41: Diskette last operation status */ BYTE DiskStatus[7]; /* 42: Disk status/command bytes */ BYTE VideoMode; /* 49: Video mode */ WORD VideoColumns; /* 4a: Number of columns */ WORD VideoPageSize; /* 4c: Video page size in bytes */ WORD VideoPageStartAddr; /* 4e: Video page start address */ BYTE VideoCursorPos[16]; /* 50: Cursor position for 8 pages */ WORD VideoCursorType; /* 60: Video cursor type */ BYTE VideoCurPage; /* 62: Video current page */ WORD VideoCtrlAddr WINE_PACKED; /* 63: Video controller address */ BYTE VideoReg1; /* 65: Video mode select register */ BYTE VideoReg2; /* 66: Video CGA palette register */ DWORD ResetEntry WINE_PACKED; /* 67: Warm reset entry point */ BYTE LastIRQ; /* 6b: Last unexpected interrupt */ DWORD Ticks; /* 6c: Ticks since midnight */ BYTE TicksOverflow; /* 70: Timer overflow if past midnight */ BYTE CtrlBreakFlag; /* 71: Ctrl-Break flag */ WORD ResetFlag; /* 72: POST Reset flag */ BYTE DiskOpStatus; /* 74: Last hard-disk operation status */ BYTE NbHardDisks; /* 75: Number of hard disks */ BYTE DiskCtrlByte; /* 76: Disk control byte */ BYTE DiskIOPort; /* 77: Disk I/O port offset */ BYTE LptTimeout[4]; /* 78: Timeouts for parallel ports */ BYTE ComTimeout[4]; /* 7c: Timeouts for serial ports */ WORD KbdBufferStart; /* 80: Keyboard buffer start */ WORD KbdBufferEnd; /* 82: Keyboard buffer end */ } BIOSDATA; #pragma pack(4) static BIOSDATA *pBiosData = NULL; 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(HMODULE16 hModule) { TDB *pTask = hModule ? NULL : (TDB *)GlobalLock16( GetCurrentTask() ); NE_MODULE *pModule = (hModule || pTask) ? NE_GetPtr( hModule ? hModule : 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(HMODULE16 hModule) { return DOSMEM_MemoryBase(hModule)+0x9FFFC; /* 640K */ } /*********************************************************************** * DOSMEM_InfoBlock * * Gets the DOS memory info block. */ static dosmem_info *DOSMEM_InfoBlock(HMODULE16 hModule) { return (dosmem_info*)(DOSMEM_MemoryBase(hModule)+0x10000); /* 64K */ } /*********************************************************************** * DOSMEM_RootBlock * * Gets the DOS memory root block. */ static dosmem_entry *DOSMEM_RootBlock(HMODULE16 hModule) { /* first block has to be paragraph-aligned */ return (dosmem_entry*)(((char*)DOSMEM_InfoBlock(hModule)) + ((((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(HMODULE16 hModule) { SEGPTR *isr = (SEGPTR*)DOSMEM_MemoryBase(hModule); 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_FillBiosSegment * * Fill the BIOS data segment with dummy values. */ static void DOSMEM_FillBiosSegment(void) { pBiosData = (BIOSDATA *)GlobalLock16( DOSMEM_BiosSeg ); /* Clear all unused values */ memset( pBiosData, 0, sizeof(*pBiosData) ); /* FIXME: should check the number of configured drives and ports */ pBiosData->Com1Addr = 0x3e8; pBiosData->Com2Addr = 0x2e8; pBiosData->Lpt1Addr = 0x378; pBiosData->Lpt2Addr = 0x278; pBiosData->InstalledHardware = 0x8443; 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; } /*********************************************************************** * DOSMEM_InitCollateTable * * Initialises the collate table (character sorting, language dependent) */ static void DOSMEM_InitCollateTable() { DWORD x; unsigned char *tbl; int i; x = GlobalDOSAlloc(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 = GlobalDOSAlloc(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(HMODULE16 hModule) { /* 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(hModule); dosmem_entry* root_block = DOSMEM_RootBlock(hModule); dosmem_entry* dm; root_block->size = DOSMEM_MemoryTop(hModule) - (((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_Init * * Create the dos memory segments, and store them into the KERNEL * exported values. */ BOOL32 DOSMEM_Init(HMODULE16 hModule) { if (!hModule) { /* Allocate 1 MB dosmemory * - it is mostly wasted but we use can some of it to * store internal translation tables, etc... */ DOSMEM_dosmem = VirtualAlloc( NULL, 0x100000, MEM_COMMIT, PAGE_EXECUTE_READWRITE ); if (!DOSMEM_dosmem) { WARN(dosmem, "Could not allocate DOS memory.\n" ); return FALSE; } DOSMEM_BiosSeg = GLOBAL_CreateBlock(GMEM_FIXED,DOSMEM_dosmem+0x400,0x100, 0, FALSE, FALSE, FALSE, NULL ); DOSMEM_FillIsrTable(0); DOSMEM_FillBiosSegment(); DOSMEM_InitMemory(0); DOSMEM_InitCollateTable(); DOSMEM_InitErrorTable(); } else { #if 0 DOSMEM_FillIsrTable(hModule); DOSMEM_InitMemory(hModule); #else /* bootstrap the new V86 task with a copy of the "system" memory */ memcpy(DOSMEM_MemoryBase(hModule), DOSMEM_dosmem, 0x100000); #endif } return TRUE; } /*********************************************************************** * DOSMEM_Tick * * Increment the BIOS tick counter. Called by timer signal handler. */ void DOSMEM_Tick( WORD timer ) { if (pBiosData) pBiosData->Ticks++; } /*********************************************************************** * DOSMEM_GetBlock * * Carve a chunk of the DOS memory block (without selector). */ LPVOID DOSMEM_GetBlock(HMODULE16 hModule, UINT32 size, UINT16* pseg) { UINT32 blocksize; char *block = NULL; dosmem_info *info_block = DOSMEM_InfoBlock(hModule); dosmem_entry *dm; #ifdef __DOSMEM_DEBUG_ dosmem_entry *prev = NULL; #endif if( size > info_block->free ) return NULL; dm = DOSMEM_RootBlock(hModule); while (dm && dm->size != DM_BLOCK_TERMINAL) { #ifdef __DOSMEM_DEBUG__ if( (dm->size & DM_BLOCK_DEBUG) != DM_BLOCK_DEBUG ) { WARN(dosmem,"MCB overrun! [prev = 0x%08x]\n", 4 + (UINT32)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(hModule)) >> 4; #ifdef __DOSMEM_DEBUG__ dm->size |= DM_BLOCK_DEBUG; #endif break; } dm = next; } else dm = NEXT_BLOCK(dm); } return (LPVOID)block; } /*********************************************************************** * DOSMEM_FreeBlock */ BOOL32 DOSMEM_FreeBlock(HMODULE16 hModule, void* ptr) { dosmem_info *info_block = DOSMEM_InfoBlock(hModule); if( ptr >= (void*)(((char*)DOSMEM_RootBlock(hModule)) + sizeof(dosmem_entry)) && ptr < (void*)DOSMEM_MemoryTop(hModule) && !((((char*)ptr) - DOSMEM_MemoryBase(hModule)) & 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(HMODULE16 hModule, void* ptr, UINT32 size, UINT16* pseg) { char *block = NULL; dosmem_info *info_block = DOSMEM_InfoBlock(hModule); if( ptr >= (void*)(((char*)DOSMEM_RootBlock(hModule)) + sizeof(dosmem_entry)) && ptr < (void*)DOSMEM_MemoryTop(hModule) && !((((char*)ptr) - DOSMEM_MemoryBase(hModule)) & 0xf) ) { dosmem_entry *dm = (dosmem_entry*)(((char*)ptr) - sizeof(dosmem_entry)); if( pseg ) *pseg = ((char*)ptr - DOSMEM_MemoryBase(hModule)) >> 4; if( !(dm->size & (DM_BLOCK_FREE | DM_BLOCK_TERMINAL)) ) { dosmem_entry *next = NEXT_BLOCK(dm); UINT32 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 { block = DOSMEM_GetBlock(hModule, size, pseg); if (block) { info_block->blocks--; info_block->free += dm->size; dm->size |= DM_BLOCK_FREE; } } } } return (LPVOID)block; } /*********************************************************************** * DOSMEM_Available */ UINT32 DOSMEM_Available(HMODULE16 hModule) { UINT32 blocksize, available = 0; dosmem_entry *dm; dm = DOSMEM_RootBlock(hModule); while (dm && dm->size != DM_BLOCK_TERMINAL) { #ifdef __DOSMEM_DEBUG__ if( (dm->size & DM_BLOCK_DEBUG) != DM_BLOCK_DEBUG ) { WARN(dosmem,"MCB overrun! [prev = 0x%08x]\n", 4 + (UINT32)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. */ UINT32 DOSMEM_MapLinearToDos(LPVOID ptr) { if (((char*)ptr >= DOSMEM_MemoryBase(0)) && ((char*)ptr < DOSMEM_MemoryBase(0) + 0x100000)) return (UINT32)ptr - (UINT32)DOSMEM_MemoryBase(0); return (UINT32)ptr; } /*********************************************************************** * DOSMEM_MapDosToLinear * * DOS linear address to the linear address space. */ LPVOID DOSMEM_MapDosToLinear(UINT32 ptr) { if (ptr < 0x100000) return (LPVOID)(ptr + (UINT32)DOSMEM_MemoryBase(0)); return (LPVOID)ptr; } /*********************************************************************** * DOSMEM_MapRealToLinear * * Real mode DOS address into a linear pointer */ LPVOID DOSMEM_MapRealToLinear(DWORD x) { LPVOID lin; lin=DOSMEM_MemoryBase(0)+(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; }