9 Nov
2013
9 Nov
'13
12:28 a.m.
Author: hbelusca
Date: Sat Nov 9 00:28:26 2013
New Revision: 60890
URL: http://svn.reactos.org/svn/reactos?rev=60890&view=rev
Log:
[NTVDM]: Add offset information to the BIOS Data Area, and add missing fields. See the
provided links in the patch for more information.
Modified:
branches/ntvdm/subsystems/ntvdm/bios.h
Modified: branches/ntvdm/subsystems/ntvdm/bios.h
URL:
http://svn.reactos.org/svn/reactos/branches/ntvdm/subsystems/ntvdm/bios.h?r…
==============================================================================
--- branches/ntvdm/subsystems/ntvdm/bios.h [iso-8859-1] (original)
+++ branches/ntvdm/subsystems/ntvdm/bios.h [iso-8859-1] Sat Nov 9 00:28:26 2013
@@ -24,12 +24,12 @@
#define BIOS_SEGMENT 0xF000
-#define BIOS_VIDEO_INTERRUPT 0x10
-#define BIOS_EQUIPMENT_INTERRUPT 0x11
-#define BIOS_MEMORY_SIZE 0x12
-#define BIOS_KBD_INTERRUPT 0x16
-#define BIOS_TIME_INTERRUPT 0x1A
-#define BIOS_SYS_TIMER_INTERRUPT 0x1C
+#define BIOS_VIDEO_INTERRUPT 0x10
+#define BIOS_EQUIPMENT_INTERRUPT 0x11
+#define BIOS_MEMORY_SIZE 0x12
+#define BIOS_KBD_INTERRUPT 0x16
+#define BIOS_TIME_INTERRUPT 0x1A
+#define BIOS_SYS_TIMER_INTERRUPT 0x1C
#define CONSOLE_FONT_HEIGHT 8
#define BIOS_KBD_BUFFER_SIZE 16
@@ -69,53 +69,81 @@
#pragma pack(push, 1)
+/*
+ * BIOS Data Area at 0040:XXXX
+ *
+ * See: http://webpages.charter.net/danrollins/techhelp/0093.HTM
+ * and: http://www.bioscentral.com/misc/bda.htm
+ * for more information.
+ */
typedef struct
{
- WORD SerialPorts[4];
- WORD ParallelPorts[3];
- WORD EbdaSegment; // Sometimes, ParallelPort
- WORD EquipmentList;
- BYTE Reserved0; // Errors in PCjr infrared keyboard link
- WORD MemorySize;
- WORD Reserved1; // Scratch pad for manufacturing error tests
- WORD KeybdShiftFlags;
- BYTE AlternateKeypad;
- WORD KeybdBufferHead;
- WORD KeybdBufferTail;
- WORD KeybdBuffer[BIOS_KBD_BUFFER_SIZE];
- BYTE DriveRecalibrate;
- BYTE DriveMotorStatus;
- BYTE MotorShutdownCounter;
- BYTE LastDisketteOperation;
- BYTE Reserved2[7];
- BYTE VideoMode;
- WORD ScreenColumns;
- WORD VideoPageSize;
- WORD VideoPageOffset;
- WORD CursorPosition[BIOS_MAX_PAGES];
- BYTE CursorEndLine;
- BYTE CursorStartLine;
- BYTE VideoPage;
- WORD CrtBasePort;
- BYTE CrtModeControl;
- BYTE CrtColorPaletteMask;
- DWORD Uptime;
- BYTE Reserved3;
- DWORD TickCounter;
- BYTE MidnightPassed;
- BYTE BreakFlag;
- WORD SoftReset;
- BYTE LastDiskOperation;
- BYTE NumDisks;
- BYTE DriveControlByte;
- BYTE DiskPortOffset;
- BYTE LptTimeOut[4];
- BYTE ComTimeOut[4];
- WORD KeybdBufferStart;
- WORD KeybdBufferEnd;
- BYTE ScreenRows;
- WORD CharacterHeight;
+ WORD SerialPorts[4]; // 0x00
+ WORD ParallelPorts[3]; // 0x08
+ WORD EbdaSegment; // 0x0e - ParallelPort in PC/XT
+ WORD EquipmentList; // 0x10
+ BYTE Reserved0; // 0x12 - Errors in PCjr infrared
keyboard link
+ WORD MemorySize; // 0x13
+ WORD Reserved1; // 0x15 - Scratch pad for manufacturing
error tests
+ WORD KeybdShiftFlags; // 0x17
+ BYTE AlternateKeypad; // 0x19
+ WORD KeybdBufferHead; // 0x1a
+ WORD KeybdBufferTail; // 0x1c
+ WORD KeybdBuffer[BIOS_KBD_BUFFER_SIZE]; // 0x1e
+ BYTE DriveRecalibrate; // 0x3e
+ BYTE DriveMotorStatus; // 0x3f
+ BYTE MotorShutdownCounter; // 0x40
+ BYTE LastDisketteOperation; // 0x41
+ BYTE Reserved2[7]; // 0x42
+ BYTE VideoMode; // 0x49
+ WORD ScreenColumns; // 0x4a
+ WORD VideoPageSize; // 0x4c
+ WORD VideoPageOffset; // 0x4e
+ WORD CursorPosition[BIOS_MAX_PAGES]; // 0x50
+ BYTE CursorEndLine; // 0x60
+ BYTE CursorStartLine; // 0x61
+ BYTE VideoPage; // 0x62
+ WORD CrtBasePort; // 0x63
+ BYTE CrtModeControl; // 0x65
+ BYTE CrtColorPaletteMask; // 0x66
+ BYTE CassetteData[5]; // 0x67
+ DWORD TickCounter; // 0x6c
+ BYTE MidnightPassed; // 0x70
+ BYTE BreakFlag; // 0x71
+ WORD SoftReset; // 0x72
+ BYTE LastDiskOperation; // 0x74
+ BYTE NumDisks; // 0x75
+ BYTE DriveControlByte; // 0x76
+ BYTE DiskPortOffset; // 0x77
+ BYTE LptTimeOut[4]; // 0x78
+ BYTE ComTimeOut[4]; // 0x7c
+ WORD KeybdBufferStart; // 0x80
+ WORD KeybdBufferEnd; // 0x82
+ BYTE ScreenRows; // 0x84
+ WORD CharacterHeight; // 0x85
+ BYTE EGAFlags[2]; // 0x87
+ BYTE VGAFlags[2]; // 0x89
+ DWORD Reserved3; // 0x8b
+ BYTE Reserved4; // 0x8f
+ BYTE Reserved5[2]; // 0x90
+ BYTE Reserved6[2]; // 0x92
+ BYTE Reserved7[2]; // 0x94
+ WORD Reserved8; // 0x96
+ DWORD Reserved9; // 0x98
+ DWORD Reserved10; // 0x9c
+ DWORD Reserved11[2]; // 0xa0
+ DWORD EGAPtr; // 0xa8
+ BYTE Reserved12[68]; // 0xac
+ BYTE Reserved13[16]; // 0xf0
+
+ DWORD Reserved14; // 0x100
+ BYTE Reserved15[12]; // 0x104
+ BYTE Reserved16[17]; // 0x110
+ BYTE Reserved17[15]; // 0x121
+ BYTE Reserved18[3]; // 0x130
} BIOS_DATA_AREA, *PBIOS_DATA_AREA;
+
+C_ASSERT(sizeof(BIOS_DATA_AREA) == 0x133);
#pragma pack(pop)