| /* |
| * DOS memory emulation |
| * |
| * Copyright 1995 Alexandre Julliard |
| * Copyright 1996 Marcus Meissner |
| */ |
| |
| #include <signal.h> |
| #include <stdio.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; |
| char *DOSMEM_dosmem; |
| struct dosmem_entry { |
| struct dosmem_entry *next; |
| BYTE isfree; |
| }; |
| |
| |
| /*********************************************************************** |
| * DOSMEM_InitCollateTable |
| * |
| * Initialises the collate table (character sorting, language dependend) |
| */ |
| DWORD DOSMEM_CollateTable; |
| |
| static void DOSMEM_InitCollateTable() |
| { |
| DWORD x; |
| unsigned char *tbl; |
| int i; |
| |
| x=GlobalDOSAlloc(258); |
| DOSMEM_CollateTable=MAKELONG(0,(x>>16)); |
| tbl=DOSMEM_RealMode2Linear(DOSMEM_CollateTable); |
| *(WORD*)tbl = 0x100; |
| tbl+=2; |
| for (i=0;i<0x100;i++) |
| *tbl++=i; |
| } |
| |
| |
| /*********************************************************************** |
| * DOSMEM_Init |
| * |
| * Create the dos memory segments, and store them into the KERNEL |
| * exported values. |
| */ |
| BOOL32 DOSMEM_Init(void) |
| { |
| /* Allocate 1 MB dosmemory */ |
| /* Yes, allocating 1 MB of memory, which is usually not even used, is a |
| * waste of memory. But I (MM) don't see any easy method to use |
| * GlobalDOS{Alloc,Free} within an area of memory, with protected mode |
| * selectors pointing into it, and the possibilty, that the userprogram |
| * calls SetSelectorBase(,physical_address_in_DOSMEM); that includes |
| * dynamical enlarging (reallocing) the dosmem area. |
| * Yes, one could walk the ldt_copy on every realloc() on DOSMEM, but |
| * this feels more like a hack to me than this current implementation is. |
| * If you find another, better, method, just change it. -Marcus Meissner |
| */ |
| DOSMEM_dosmem = VirtualAlloc(NULL,0x100000,MEM_COMMIT,PAGE_EXECUTE_READWRITE); |
| if (!DOSMEM_dosmem) |
| { |
| fprintf( stderr, "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_InitMemoryHandling(); |
| DOSMEM_InitCollateTable(); |
| return TRUE; |
| } |
| |
| /*********************************************************************** |
| * DOSMEM_InitMemoryHandling |
| * |
| * Initialises the DOS Memory structures. |
| */ |
| void |
| DOSMEM_InitMemoryHandling() |
| { |
| struct dosmem_entry *dm; |
| |
| dm = (struct dosmem_entry*)(DOSMEM_dosmem+0x10000); |
| dm->isfree = 1; |
| dm->next = (struct dosmem_entry*)(DOSMEM_dosmem+0x9FFF0); |
| dm = dm->next; |
| dm->isfree = 0; |
| dm->next = NULL; |
| } |
| |
| /*********************************************************************** |
| * DOSMEM_Tick |
| * |
| * Increment the BIOS tick counter. Called by timer signal handler. |
| */ |
| void DOSMEM_Tick(void) |
| { |
| if (pBiosData) pBiosData->Ticks++; |
| } |
| |
| |
| /*********************************************************************** |
| * DOSMEM_FillBiosSegment |
| * |
| * Fill the BIOS data segment with dummy values. |
| */ |
| 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; |
| } |
| |
| /*********************************************************************** |
| * GlobalDOSAlloc (KERNEL.184) |
| * |
| * Allocates a piece of DOS Memory, in the first 1 MB physical memory. |
| * |
| * operates on the preallocated DOSMEM_dosmem (1MB). The useable area |
| * starts at 1000:0000 and ends at 9FFF:FFEF |
| * Memory allocation strategy is First Fit. (FIXME: Yes,I know that First Fit |
| * is a rather bad strategy. But since those functions are rather seldom |
| * called, it's easyness fits the purpose well.) |
| * |
| */ |
| |
| DWORD GlobalDOSAlloc(DWORD size) |
| { |
| struct dosmem_entry *dm,*ndm; |
| DWORD start,blocksize; |
| WORD sel; |
| HMODULE16 hModule=GetModuleHandle("KERNEL"); |
| |
| |
| start = 0; |
| dm = (struct dosmem_entry*)(DOSMEM_dosmem+0x10000); |
| size = (size+0xf)&~0xf; |
| while (dm && dm->next) { |
| blocksize = ((char*)dm->next-(char*)dm)-16; |
| if ((dm->isfree) && (blocksize>=size)) { |
| dm->isfree = 0; |
| start = ((((char*)dm)-DOSMEM_dosmem)+0x10)& ~0xf; |
| if ((blocksize-size) >= 0x20) { |
| /* if enough memory is left for a new block |
| * split this area into two blocks |
| */ |
| ndm=(struct dosmem_entry*)((char*)dm+0x10+size); |
| ndm->isfree = 1; |
| ndm->next = dm->next; |
| dm->next = ndm; |
| } |
| break; |
| } |
| dm=dm->next; |
| } |
| if (!start) |
| return 0; |
| sel=GLOBAL_CreateBlock( |
| GMEM_FIXED,DOSMEM_dosmem+start,size, |
| hModule,FALSE,FALSE,FALSE,NULL |
| ); |
| return MAKELONG(sel,start>>4); |
| } |
| |
| /*********************************************************************** |
| * GlobalDOSFree (KERNEL.185) |
| * |
| * Frees allocated dosmemory and corresponding selector. |
| */ |
| |
| WORD |
| GlobalDOSFree(WORD sel) |
| { |
| DWORD base; |
| struct dosmem_entry *dm; |
| |
| base = GetSelectorBase(sel); |
| /* base has already been conversed to a physical address */ |
| if (base>=0x100000) |
| return sel; |
| dm = (struct dosmem_entry*)(DOSMEM_dosmem+base-0x10); |
| if (dm->isfree) { |
| fprintf(stderr,"Freeing already freed DOSMEM.\n"); |
| return 0; |
| } |
| dm->isfree = 1; |
| |
| /* collapse adjunct free blocks into one */ |
| dm = (struct dosmem_entry*)(DOSMEM_dosmem+0x10000); |
| while (dm && dm->next) { |
| if (dm->isfree && dm->next->isfree) |
| dm->next = dm->next->next; |
| dm = dm->next; |
| } |
| GLOBAL_FreeBlock(sel); |
| return 0; |
| } |
| |
| /*********************************************************************** |
| * DOSMEM_RealMode2Linear |
| * |
| * Converts a realmode segment:offset address into a linear pointer |
| */ |
| LPVOID DOSMEM_RealMode2Linear(DWORD x) |
| { |
| LPVOID lin; |
| |
| lin=DOSMEM_dosmem+(x&0xffff)+(((x&0xffff0000)>>16)*16); |
| dprintf_selector(stddeb,"DOSMEM_RealMode2Linear(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=GetModuleHandle("KERNEL"); |
| WORD sel; |
| |
| sel=GLOBAL_CreateBlock( |
| GMEM_FIXED,DOSMEM_dosmem+realsel*16,0x10000, |
| hModule,FALSE,FALSE,FALSE,NULL |
| ); |
| dprintf_selector(stddeb,"DOSMEM_AllocSelector(0x%04x) returns 0x%04x.\n", |
| realsel,sel |
| ); |
| return sel; |
| } |
