miscemu/dosmem.c

   1 /*
   2  * DOS memory emulation
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  */
   6
   7 #include <signal.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include "windows.h"
  12 #include "winbase.h"
  13 #include "global.h"
  14 #include "ldt.h"
  15 #include "miscemu.h"
  16 #include "module.h"
  17
  18
  19 HANDLE DOSMEM_BiosSeg;  /* BIOS data segment at 0x40:0 */
  20
  21
  22 #pragma pack(1)
  23
  24 typedef struct
  25 {
  26     WORD  Com1Addr;                  /* 00: COM1 I/O address */
  27     WORD  Com2Addr;                  /* 02: COM2 I/O address */
  28     WORD  Com3Addr;                  /* 04: COM3 I/O address */
  29     WORD  Com4Addr;                  /* 06: COM4 I/O address */
  30     WORD  Lpt1Addr;                  /* 08: LPT1 I/O address */
  31     WORD  Lpt2Addr;                  /* 0a: LPT2 I/O address */
  32     WORD  Lpt3Addr;                  /* 0c: LPT3 I/O address */
  33     WORD  Lpt4Addr;                  /* 0e: LPT4 I/O address */
  34     WORD  InstalledHardware;         /* 10: Installed hardware flags */
  35     BYTE  POSTstatus;                /* 12: Power-On Self Test status */
  36     WORD  MemSize WINE_PACKED;       /* 13: Base memory size in Kb */
  37     WORD  unused1 WINE_PACKED;       /* 15: Manufacturing test scratch pad */
  38     BYTE  KbdFlags1;                 /* 17: Keyboard flags 1 */
  39     BYTE  KbdFlags2;                 /* 18: Keyboard flags 2 */
  40     BYTE  unused2;                   /* 19: Keyboard driver workspace */
  41     WORD  NextKbdCharPtr;            /* 1a: Next character in kbd buffer */
  42     WORD  FirstKbdCharPtr;           /* 1c: First character in kbd buffer */
  43     WORD  KbdBuffer[16];             /* 1e: Keyboard buffer */
  44     BYTE  DisketteStatus1;           /* 3e: Diskette recalibrate status */
  45     BYTE  DisketteStatus2;           /* 3f: Diskette motor status */
  46     BYTE  DisketteStatus3;           /* 40: Diskette motor timeout */
  47     BYTE  DisketteStatus4;           /* 41: Diskette last operation status */
  48     BYTE  DiskStatus[7];             /* 42: Disk status/command bytes */
  49     BYTE  VideoMode;                 /* 49: Video mode */
  50     WORD  VideoColumns;              /* 4a: Number of columns */
  51     WORD  VideoPageSize;             /* 4c: Video page size in bytes */
  52     WORD  VideoPageStartAddr;        /* 4e: Video page start address */
  53     BYTE  VideoCursorPos[16];        /* 50: Cursor position for 8 pages */
  54     WORD  VideoCursorType;           /* 60: Video cursor type */
  55     BYTE  VideoCurPage;              /* 62: Video current page */
  56     WORD  VideoCtrlAddr WINE_PACKED; /* 63: Video controller address */
  57     BYTE  VideoReg1;                 /* 65: Video mode select register */
  58     BYTE  VideoReg2;                 /* 66: Video CGA palette register */
  59     DWORD ResetEntry WINE_PACKED;    /* 67: Warm reset entry point */
  60     BYTE  LastIRQ;                   /* 6b: Last unexpected interrupt */
  61     DWORD Ticks;                     /* 6c: Ticks since midnight */
  62     BYTE  TicksOverflow;             /* 70: Timer overflow if past midnight */
  63     BYTE  CtrlBreakFlag;             /* 71: Ctrl-Break flag */
  64     WORD  ResetFlag;                 /* 72: POST Reset flag */
  65     BYTE  DiskOpStatus;              /* 74: Last hard-disk operation status */
  66     BYTE  NbHardDisks;               /* 75: Number of hard disks */
  67     BYTE  DiskCtrlByte;              /* 76: Disk control byte */
  68     BYTE  DiskIOPort;                /* 77: Disk I/O port offset */
  69     BYTE  LptTimeout[4];             /* 78: Timeouts for parallel ports */
  70     BYTE  ComTimeout[4];             /* 7c: Timeouts for serial ports */
  71     WORD  KbdBufferStart;            /* 80: Keyboard buffer start */
  72     WORD  KbdBufferEnd;              /* 82: Keyboard buffer end */
  73 } BIOSDATA;
  74
  75 #pragma pack(4)
  76
  77
  78 static BIOSDATA *pBiosData = NULL;
  79
  80
  81 /***********************************************************************
  82  *           DOSMEM_Init
  83  *
  84  * Create the dos memory segments, and store them into the KERNEL
  85  * exported values. BUILTIN_Init() must already have been called.
  86  */
  87 BOOL DOSMEM_Init(void)
  88 {
  89     HMODULE hModule = GetModuleHandle( "KERNEL" );
  90     char *dosmem;
  91
  92     /* Allocate 7 64k segments for 0000, A000, B000, C000, D000, E000, F000. */
  93
  94     dosmem = VirtualAlloc( NULL, 0x70000, MEM_COMMIT, PAGE_EXECUTE_READWRITE );
  95     if (!dosmem)
  96     {
  97         fprintf( stderr, "Could not allocate DOS segments\n" );
  98         return FALSE;
  99     }
 100
 101     MODULE_SetEntryPoint( hModule, 183,  /* KERNEL.183: __0000H */
 102                           GLOBAL_CreateBlock( GMEM_FIXED, dosmem,
 103                                 0x10000, hModule, FALSE, FALSE, FALSE, NULL ));
 104     DOSMEM_BiosSeg = GLOBAL_CreateBlock( GMEM_FIXED, dosmem + 0x400, 0x100,
 105                                          hModule, FALSE, FALSE, FALSE, NULL );
 106
 107     MODULE_SetEntryPoint( hModule, 193,  /* KERNEL.193: __0040H */
 108                           DOSMEM_BiosSeg );
 109     MODULE_SetEntryPoint( hModule, 174,  /* KERNEL.174: __A000H */
 110                           GLOBAL_CreateBlock( GMEM_FIXED, dosmem + 0x10000,
 111                                 0x10000, hModule, FALSE, FALSE, FALSE, NULL ));
 112     MODULE_SetEntryPoint( hModule, 181,  /* KERNEL.181: __B000H */
 113                           GLOBAL_CreateBlock( GMEM_FIXED, dosmem + 0x20000,
 114                                 0x10000, hModule, FALSE, FALSE, FALSE, NULL ));
 115     MODULE_SetEntryPoint( hModule, 182,  /* KERNEL.182: __B800H */
 116                           GLOBAL_CreateBlock( GMEM_FIXED, dosmem + 0x28000,
 117                                 0x10000, hModule, FALSE, FALSE, FALSE, NULL ));
 118     MODULE_SetEntryPoint( hModule, 195,  /* KERNEL.195: __C000H */
 119                           GLOBAL_CreateBlock( GMEM_FIXED, dosmem + 0x30000,
 120                                 0x10000, hModule, FALSE, FALSE, FALSE, NULL ));
 121     MODULE_SetEntryPoint( hModule, 179,  /* KERNEL.179: __D000H */
 122                           GLOBAL_CreateBlock( GMEM_FIXED, dosmem + 0x40000,
 123                                 0x10000, hModule, FALSE, FALSE, FALSE, NULL ));
 124     MODULE_SetEntryPoint( hModule, 190,  /* KERNEL.190: __E000H */
 125                           GLOBAL_CreateBlock( GMEM_FIXED, dosmem + 0x50000,
 126                                 0x10000, hModule, FALSE, FALSE, FALSE, NULL ));
 127     MODULE_SetEntryPoint( hModule, 173,  /* KERNEL.173: __ROMBIOS */
 128                           GLOBAL_CreateBlock( GMEM_FIXED, dosmem + 0x60000,
 129                                 0x10000, hModule, FALSE, FALSE, FALSE, NULL ));
 130     MODULE_SetEntryPoint( hModule, 194,  /* KERNEL.194: __F000H */
 131                           GLOBAL_CreateBlock( GMEM_FIXED, dosmem + 0x60000,
 132                                 0x10000, hModule, FALSE, FALSE, FALSE, NULL ));
 133     DOSMEM_FillBiosSegment();
 134
 135     return TRUE;
 136 }
 137
 138
 139 /***********************************************************************
 140  *           DOSMEM_Tick
 141  *
 142  * Increment the BIOS tick counter. Called by timer signal handler.
 143  */
 144 void DOSMEM_Tick(void)
 145 {
 146     if (pBiosData) pBiosData->Ticks++;
 147 }
 148
 149
 150 /***********************************************************************
 151  *           DOSMEM_FillBiosSegment
 152  *
 153  * Fill the BIOS data segment with dummy values.
 154  */
 155 void DOSMEM_FillBiosSegment(void)
 156 {
 157     pBiosData = (BIOSDATA *)GlobalLock( DOSMEM_BiosSeg );
 158
 159       /* Clear all unused values */
 160     memset( pBiosData, 0, sizeof(*pBiosData) );
 161
 162     /* FIXME: should check the number of configured drives and ports */
 163
 164     pBiosData->Com1Addr             = 0x3e8;
 165     pBiosData->Com2Addr             = 0x2e8;
 166     pBiosData->Lpt1Addr             = 0x378;
 167     pBiosData->Lpt2Addr             = 0x278;
 168     pBiosData->InstalledHardware    = 0x8443;
 169     pBiosData->MemSize              = 640;
 170     pBiosData->NextKbdCharPtr       = 0x1e;
 171     pBiosData->FirstKbdCharPtr      = 0x1e;
 172     pBiosData->VideoMode            = 0;
 173     pBiosData->VideoColumns         = 80;
 174     pBiosData->VideoPageSize        = 80 * 25 * 2;
 175     pBiosData->VideoPageStartAddr   = 0xb800;
 176     pBiosData->VideoCtrlAddr        = 0x3d4;
 177     pBiosData->Ticks                = INT1A_GetTicksSinceMidnight();
 178     pBiosData->NbHardDisks          = 2;
 179     pBiosData->KbdBufferStart       = 0x1e;
 180     pBiosData->KbdBufferEnd         = 0x3e;
 181 }
 182