subsystems/ntvdm/bios.h

   1 /*
   2  * COPYRIGHT:       GPL - See COPYING in the top level directory
   3  * PROJECT:         ReactOS Virtual DOS Machine
   4  * FILE:            bios.h
   5  * PURPOSE:         VDM BIOS
   6  * PROGRAMMERS:     Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
   7  */
   8
   9 #ifndef _BIOS_H_
  10 #define _BIOS_H_
  11
  12 /* INCLUDES *******************************************************************/
  13
  14 #include "ntvdm.h"
  15
  16 /* DEFINES ********************************************************************/
  17
  18 #define ROM_AREA_START  0xE0000
  19 #define ROM_AREA_END    0xFFFFF
  20
  21 #define BDA_SEGMENT     0x40
  22 #define BIOS_SEGMENT    0xF000
  23
  24 #define BIOS_PIC_MASTER_INT 0x08
  25 #define BIOS_PIC_SLAVE_INT  0x70
  26
  27 #define BIOS_VIDEO_INTERRUPT        0x10
  28 #define BIOS_EQUIPMENT_INTERRUPT    0x11
  29 #define BIOS_MEMORY_SIZE            0x12
  30 #define BIOS_MISC_INTERRUPT         0x15
  31 #define BIOS_KBD_INTERRUPT          0x16
  32 #define BIOS_TIME_INTERRUPT         0x1A
  33 #define BIOS_SYS_TIMER_INTERRUPT    0x1C
  34
  35 #define CONSOLE_FONT_HEIGHT 8
  36 #define BIOS_KBD_BUFFER_SIZE 16
  37 #define BIOS_EQUIPMENT_LIST 0x2C // HACK: Disable FPU for now
  38
  39 #define BIOS_DEFAULT_VIDEO_MODE 0x03
  40 #define BIOS_MAX_PAGES 8
  41 #define BIOS_MAX_VIDEO_MODE 0x13
  42 #define DEFAULT_ATTRIBUTE   0x07
  43
  44 #define GRAPHICS_VIDEO_SEG  0xA000
  45 #define TEXT_VIDEO_SEG      0xB800
  46
  47 #define BDA_KBDFLAG_RSHIFT      (1 << 0)
  48 #define BDA_KBDFLAG_LSHIFT      (1 << 1)
  49 #define BDA_KBDFLAG_CTRL        (1 << 2)
  50 #define BDA_KBDFLAG_ALT         (1 << 3)
  51 #define BDA_KBDFLAG_SCROLL_ON   (1 << 4)
  52 #define BDA_KBDFLAG_NUMLOCK_ON  (1 << 5)
  53 #define BDA_KBDFLAG_CAPSLOCK_ON (1 << 6)
  54 #define BDA_KBDFLAG_INSERT_ON   (1 << 7)
  55 #define BDA_KBDFLAG_RALT        (1 << 8)
  56 #define BDA_KBDFLAG_LALT        (1 << 9)
  57 #define BDA_KBDFLAG_SYSRQ       (1 << 10)
  58 #define BDA_KBDFLAG_PAUSE       (1 << 11)
  59 #define BDA_KBDFLAG_SCROLL      (1 << 12)
  60 #define BDA_KBDFLAG_NUMLOCK     (1 << 13)
  61 #define BDA_KBDFLAG_CAPSLOCK    (1 << 14)
  62 #define BDA_KBDFLAG_INSERT      (1 << 15)
  63
  64 enum
  65 {
  66     SCROLL_DIRECTION_UP,
  67     SCROLL_DIRECTION_DOWN,
  68     SCROLL_DIRECTION_LEFT,
  69     SCROLL_DIRECTION_RIGHT
  70 };
  71
  72 /*
  73  * BIOS Data Area at 0040:XXXX
  74  *
  75  * See: http://webpages.charter.net/danrollins/techhelp/0093.HTM
  76  * and: http://www.bioscentral.com/misc/bda.htm
  77  * for more information.
  78  */
  79 #pragma pack(push, 1)
  80 typedef struct
  81 {
  82     WORD SerialPorts[4];                        // 0x00
  83     WORD ParallelPorts[3];                      // 0x08
  84     WORD EbdaSegment;                           // 0x0e - ParallelPort in PC/XT
  85     WORD EquipmentList;                         // 0x10
  86     BYTE Reserved0;                             // 0x12 - Errors in PCjr infrared keyboard link
  87     WORD MemorySize;                            // 0x13
  88     WORD Reserved1;                             // 0x15 - Scratch pad for manufacturing error tests
  89     WORD KeybdShiftFlags;                       // 0x17
  90     BYTE AlternateKeypad;                       // 0x19
  91     WORD KeybdBufferHead;                       // 0x1a
  92     WORD KeybdBufferTail;                       // 0x1c
  93     WORD KeybdBuffer[BIOS_KBD_BUFFER_SIZE];     // 0x1e
  94     BYTE DriveRecalibrate;                      // 0x3e
  95     BYTE DriveMotorStatus;                      // 0x3f
  96     BYTE MotorShutdownCounter;                  // 0x40
  97     BYTE LastDisketteOperation;                 // 0x41
  98     BYTE Reserved2[7];                          // 0x42
  99     BYTE VideoMode;                             // 0x49
 100     WORD ScreenColumns;                         // 0x4a
 101     WORD VideoPageSize;                         // 0x4c
 102     WORD VideoPageOffset;                       // 0x4e
 103     WORD CursorPosition[BIOS_MAX_PAGES];        // 0x50
 104     BYTE CursorEndLine;                         // 0x60
 105     BYTE CursorStartLine;                       // 0x61
 106     BYTE VideoPage;                             // 0x62
 107     WORD CrtBasePort;                           // 0x63
 108     BYTE CrtModeControl;                        // 0x65
 109     BYTE CrtColorPaletteMask;                   // 0x66
 110     BYTE CassetteData[5];                       // 0x67
 111     DWORD TickCounter;                          // 0x6c
 112     BYTE MidnightPassed;                        // 0x70
 113     BYTE BreakFlag;                             // 0x71
 114     WORD SoftReset;                             // 0x72
 115     BYTE LastDiskOperation;                     // 0x74
 116     BYTE NumDisks;                              // 0x75
 117     BYTE DriveControlByte;                      // 0x76
 118     BYTE DiskPortOffset;                        // 0x77
 119     BYTE LptTimeOut[4];                         // 0x78
 120     BYTE ComTimeOut[4];                         // 0x7c
 121     WORD KeybdBufferStart;                      // 0x80
 122     WORD KeybdBufferEnd;                        // 0x82
 123     BYTE ScreenRows;                            // 0x84
 124     WORD CharacterHeight;                       // 0x85
 125     BYTE EGAFlags[2];                           // 0x87
 126     BYTE VGAFlags[2];                           // 0x89
 127     DWORD Reserved3;                            // 0x8b
 128     BYTE Reserved4;                             // 0x8f
 129     BYTE Reserved5[2];                          // 0x90
 130     BYTE Reserved6[2];                          // 0x92
 131     BYTE Reserved7[2];                          // 0x94
 132     WORD Reserved8;                             // 0x96
 133     DWORD Reserved9;                            // 0x98
 134     DWORD Reserved10;                           // 0x9c
 135     DWORD Reserved11[2];                        // 0xa0
 136     DWORD EGAPtr;                               // 0xa8
 137     BYTE Reserved12[68];                        // 0xac
 138     BYTE Reserved13[16];                        // 0xf0
 139
 140     DWORD Reserved14;                           // 0x100
 141     BYTE Reserved15[12];                        // 0x104
 142     BYTE Reserved16[17];                        // 0x110
 143     BYTE Reserved17[15];                        // 0x121
 144     BYTE Reserved18[3];                         // 0x130
 145 } BIOS_DATA_AREA, *PBIOS_DATA_AREA;
 146 #pragma pack(pop)
 147
 148 C_ASSERT(sizeof(BIOS_DATA_AREA) == 0x133);
 149
 150 /* FUNCTIONS ******************************************************************/
 151
 152 extern PBIOS_DATA_AREA Bda;
 153
 154 WORD BiosPeekCharacter(VOID);
 155 WORD BiosGetCharacter(VOID);
 156 VOID BiosPrintCharacter(CHAR Character, BYTE Attribute, BYTE Page);
 157
 158 BOOLEAN BiosInitialize(VOID);
 159 VOID BiosCleanup(VOID);
 160 VOID BiosHandleIrq(BYTE IrqNumber, LPWORD Stack);
 161
 162 #endif // _BIOS_H_
 163
 164 /* EOF */