| /* |
| * DOS memory emulation |
| * |
| * Copyright 1995 Alexandre Julliard |
| * Copyright 1996 Marcus Meissner |
| */ |
| |
| #include <signal.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include "windows.h" |
| #include "winbase.h" |
| #include "global.h" |
| #include "ldt.h" |
| #include "miscemu.h" |
| #include "module.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; |
| static char *DOSMEM_top; |
| |
| 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; |
| |
| static dosmem_entry* root_block = NULL; |
| static dosmem_info* info_block = NULL; |
| |
| #define NEXT_BLOCK(block) \ |
| (dosmem_entry*)(((char*)(block)) + \ |
| sizeof(dosmem_entry) + ((block)->size & DM_BLOCK_MASK)) |
| |
| /*********************************************************************** |
| * 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 = 0; |
| 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_InitMemory |
| * |
| * Initialises the DOS memory structures. |
| */ |
| static void DOSMEM_InitMemory() |
| { |
| /* Low 64Kb are reserved for DOS/BIOS so the useable area starts at |
| * 1000:0000 and ends at 9FFF:FFEF. */ |
| |
| dosmem_entry* dm; |
| |
| DOSMEM_top = DOSMEM_dosmem+0x9FFFC; /* 640K */ |
| info_block = (dosmem_info*)( DOSMEM_dosmem + 0x10000 ); |
| |
| /* first block has to be paragraph-aligned relative to the DOSMEM_dosmem */ |
| |
| root_block = (dosmem_entry*)( DOSMEM_dosmem + 0x10000 + |
| ((((sizeof(dosmem_info) + 0xf) & ~0xf) - sizeof(dosmem_entry)))); |
| root_block->size = DOSMEM_top - (((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(void) |
| { |
| /* 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_FillBiosSegment(); |
| DOSMEM_InitMemory(); |
| DOSMEM_InitCollateTable(); |
| return TRUE; |
| } |
| |
| |
| /*********************************************************************** |
| * DOSMEM_Tick |
| * |
| * Increment the BIOS tick counter. Called by timer signal handler. |
| */ |
| void DOSMEM_Tick(void) |
| { |
| if (pBiosData) pBiosData->Ticks++; |
| } |
| |
| /*********************************************************************** |
| * DOSMEM_GetBlock |
| * |
| * Carve a chunk of the DOS memory block (without selector). |
| */ |
| LPVOID DOSMEM_GetBlock(UINT32 size, UINT16* pseg) |
| { |
| UINT32 blocksize; |
| char *block = NULL; |
| dosmem_entry *dm; |
| #ifdef __DOSMEM_DEBUG_ |
| dosmem_entry *prev = NULL; |
| #endif |
| |
| if( size > info_block->free ) return NULL; |
| dm = root_block; |
| |
| 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_dosmem) >> 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(void* ptr) |
| { |
| if( ptr >= (void*)(((char*)root_block) + sizeof(dosmem_entry)) && |
| ptr < (void*)DOSMEM_top && !((((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_MapLinearToDos |
| * |
| * Linear address to the DOS address space. |
| */ |
| UINT32 DOSMEM_MapLinearToDos(LPVOID ptr) |
| { |
| if (((char*)ptr >= DOSMEM_dosmem) && |
| ((char*)ptr < DOSMEM_dosmem + 0x100000)) |
| return (UINT32)ptr - (UINT32)DOSMEM_dosmem; |
| 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_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 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; |
| } |
| |
