183 lines
7.9 KiB
C
183 lines
7.9 KiB
C
/*
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* DOS memory emulation
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*
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* Copyright 1995 Alexandre Julliard
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*/
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "windows.h"
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#include "winbase.h"
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#include "global.h"
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#include "ldt.h"
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#include "miscemu.h"
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#include "module.h"
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HANDLE DOSMEM_BiosSeg; /* BIOS data segment at 0x40:0 */
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#pragma pack(1)
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typedef struct
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{
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WORD Com1Addr; /* 00: COM1 I/O address */
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WORD Com2Addr; /* 02: COM2 I/O address */
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WORD Com3Addr; /* 04: COM3 I/O address */
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WORD Com4Addr; /* 06: COM4 I/O address */
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WORD Lpt1Addr; /* 08: LPT1 I/O address */
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WORD Lpt2Addr; /* 0a: LPT2 I/O address */
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WORD Lpt3Addr; /* 0c: LPT3 I/O address */
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WORD Lpt4Addr; /* 0e: LPT4 I/O address */
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WORD InstalledHardware; /* 10: Installed hardware flags */
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BYTE POSTstatus; /* 12: Power-On Self Test status */
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WORD MemSize WINE_PACKED; /* 13: Base memory size in Kb */
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WORD unused1 WINE_PACKED; /* 15: Manufacturing test scratch pad */
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BYTE KbdFlags1; /* 17: Keyboard flags 1 */
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BYTE KbdFlags2; /* 18: Keyboard flags 2 */
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BYTE unused2; /* 19: Keyboard driver workspace */
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WORD NextKbdCharPtr; /* 1a: Next character in kbd buffer */
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WORD FirstKbdCharPtr; /* 1c: First character in kbd buffer */
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WORD KbdBuffer[16]; /* 1e: Keyboard buffer */
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BYTE DisketteStatus1; /* 3e: Diskette recalibrate status */
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BYTE DisketteStatus2; /* 3f: Diskette motor status */
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BYTE DisketteStatus3; /* 40: Diskette motor timeout */
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BYTE DisketteStatus4; /* 41: Diskette last operation status */
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BYTE DiskStatus[7]; /* 42: Disk status/command bytes */
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BYTE VideoMode; /* 49: Video mode */
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WORD VideoColumns; /* 4a: Number of columns */
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WORD VideoPageSize; /* 4c: Video page size in bytes */
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WORD VideoPageStartAddr; /* 4e: Video page start address */
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BYTE VideoCursorPos[16]; /* 50: Cursor position for 8 pages */
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WORD VideoCursorType; /* 60: Video cursor type */
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BYTE VideoCurPage; /* 62: Video current page */
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WORD VideoCtrlAddr WINE_PACKED; /* 63: Video controller address */
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BYTE VideoReg1; /* 65: Video mode select register */
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BYTE VideoReg2; /* 66: Video CGA palette register */
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DWORD ResetEntry WINE_PACKED; /* 67: Warm reset entry point */
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BYTE LastIRQ; /* 6b: Last unexpected interrupt */
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DWORD Ticks; /* 6c: Ticks since midnight */
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BYTE TicksOverflow; /* 70: Timer overflow if past midnight */
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BYTE CtrlBreakFlag; /* 71: Ctrl-Break flag */
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WORD ResetFlag; /* 72: POST Reset flag */
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BYTE DiskOpStatus; /* 74: Last hard-disk operation status */
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BYTE NbHardDisks; /* 75: Number of hard disks */
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BYTE DiskCtrlByte; /* 76: Disk control byte */
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BYTE DiskIOPort; /* 77: Disk I/O port offset */
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BYTE LptTimeout[4]; /* 78: Timeouts for parallel ports */
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BYTE ComTimeout[4]; /* 7c: Timeouts for serial ports */
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WORD KbdBufferStart; /* 80: Keyboard buffer start */
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WORD KbdBufferEnd; /* 82: Keyboard buffer end */
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} BIOSDATA;
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#pragma pack(4)
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static BIOSDATA *pBiosData = NULL;
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/***********************************************************************
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* DOSMEM_Init
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*
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* Create the dos memory segments, and store them into the KERNEL
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* exported values. BUILTIN_Init() must already have been called.
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*/
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BOOL DOSMEM_Init(void)
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{
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HMODULE hModule = GetModuleHandle( "KERNEL" );
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char *dosmem;
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/* Allocate 7 64k segments for 0000, A000, B000, C000, D000, E000, F000. */
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dosmem = VirtualAlloc( NULL, 0x70000, MEM_COMMIT, PAGE_EXECUTE_READWRITE );
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if (!dosmem)
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{
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fprintf( stderr, "Could not allocate DOS segments\n" );
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return FALSE;
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}
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MODULE_SetEntryPoint( hModule, 183, /* KERNEL.183: __0000H */
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GLOBAL_CreateBlock( GMEM_FIXED, dosmem,
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0x10000, hModule, FALSE, FALSE, FALSE, NULL ));
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DOSMEM_BiosSeg = GLOBAL_CreateBlock( GMEM_FIXED, dosmem + 0x400, 0x100,
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hModule, FALSE, FALSE, FALSE, NULL );
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MODULE_SetEntryPoint( hModule, 193, /* KERNEL.193: __0040H */
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DOSMEM_BiosSeg );
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MODULE_SetEntryPoint( hModule, 174, /* KERNEL.174: __A000H */
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GLOBAL_CreateBlock( GMEM_FIXED, dosmem + 0x10000,
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0x10000, hModule, FALSE, FALSE, FALSE, NULL ));
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MODULE_SetEntryPoint( hModule, 181, /* KERNEL.181: __B000H */
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GLOBAL_CreateBlock( GMEM_FIXED, dosmem + 0x20000,
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0x10000, hModule, FALSE, FALSE, FALSE, NULL ));
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MODULE_SetEntryPoint( hModule, 182, /* KERNEL.182: __B800H */
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GLOBAL_CreateBlock( GMEM_FIXED, dosmem + 0x28000,
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0x10000, hModule, FALSE, FALSE, FALSE, NULL ));
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MODULE_SetEntryPoint( hModule, 195, /* KERNEL.195: __C000H */
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GLOBAL_CreateBlock( GMEM_FIXED, dosmem + 0x30000,
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0x10000, hModule, FALSE, FALSE, FALSE, NULL ));
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MODULE_SetEntryPoint( hModule, 179, /* KERNEL.179: __D000H */
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GLOBAL_CreateBlock( GMEM_FIXED, dosmem + 0x40000,
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0x10000, hModule, FALSE, FALSE, FALSE, NULL ));
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MODULE_SetEntryPoint( hModule, 190, /* KERNEL.190: __E000H */
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GLOBAL_CreateBlock( GMEM_FIXED, dosmem + 0x50000,
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0x10000, hModule, FALSE, FALSE, FALSE, NULL ));
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MODULE_SetEntryPoint( hModule, 173, /* KERNEL.173: __ROMBIOS */
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GLOBAL_CreateBlock( GMEM_FIXED, dosmem + 0x60000,
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0x10000, hModule, FALSE, FALSE, FALSE, NULL ));
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MODULE_SetEntryPoint( hModule, 194, /* KERNEL.194: __F000H */
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GLOBAL_CreateBlock( GMEM_FIXED, dosmem + 0x60000,
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0x10000, hModule, FALSE, FALSE, FALSE, NULL ));
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DOSMEM_FillBiosSegment();
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return TRUE;
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}
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/***********************************************************************
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* DOSMEM_Tick
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*
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* Increment the BIOS tick counter. Called by timer signal handler.
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*/
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void DOSMEM_Tick(void)
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{
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if (pBiosData) pBiosData->Ticks++;
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}
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/***********************************************************************
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* DOSMEM_FillBiosSegment
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*
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* Fill the BIOS data segment with dummy values.
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*/
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void DOSMEM_FillBiosSegment(void)
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{
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pBiosData = (BIOSDATA *)GlobalLock16( DOSMEM_BiosSeg );
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/* Clear all unused values */
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memset( pBiosData, 0, sizeof(*pBiosData) );
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/* FIXME: should check the number of configured drives and ports */
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pBiosData->Com1Addr = 0x3e8;
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pBiosData->Com2Addr = 0x2e8;
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pBiosData->Lpt1Addr = 0x378;
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pBiosData->Lpt2Addr = 0x278;
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pBiosData->InstalledHardware = 0x8443;
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pBiosData->MemSize = 640;
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pBiosData->NextKbdCharPtr = 0x1e;
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pBiosData->FirstKbdCharPtr = 0x1e;
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pBiosData->VideoMode = 0;
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pBiosData->VideoColumns = 80;
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pBiosData->VideoPageSize = 80 * 25 * 2;
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pBiosData->VideoPageStartAddr = 0xb800;
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pBiosData->VideoCtrlAddr = 0x3d4;
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pBiosData->Ticks = INT1A_GetTicksSinceMidnight();
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pBiosData->NbHardDisks = 2;
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pBiosData->KbdBufferStart = 0x1e;
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pBiosData->KbdBufferEnd = 0x3e;
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}
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