projects / reactos.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
history | raw | HEAD
[NTVDM]: Fix informative comment.
[reactos.git] / subsystems / ntvdm / bios.c
1 /*
2 * COPYRIGHT: GPL - See COPYING in the top level directory
3 * PROJECT: ReactOS Virtual DOS Machine
4 * FILE: bios.c
5 * PURPOSE: VDM BIOS
6 * PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
7 */
8
9 /* INCLUDES *******************************************************************/
10
11 #define NDEBUG
12
13 #include "bios.h"
14 #include "emulator.h"
15 #include "vga.h"
16 #include "pic.h"
17 #include "ps2.h"
18 #include "timer.h"
19
20 #include "registers.h"
21
22 /* PRIVATE VARIABLES **********************************************************/
23
24 PBIOS_DATA_AREA Bda;
25 static BYTE BiosKeyboardMap[256];
26 static HANDLE BiosConsoleInput = INVALID_HANDLE_VALUE;
27 static HANDLE BiosConsoleOutput = INVALID_HANDLE_VALUE;
28 static CONSOLE_SCREEN_BUFFER_INFO BiosSavedBufferInfo;
29 static HANDLE InputThread = NULL;
30
31 /*
32 * VGA Register Configurations for BIOS Video Modes
33 * The configurations come from DosBox.
34 */
35 static BYTE VideoMode_40x25_text[] =
36 {
37 /* Miscellaneous Register */
38 0x67,
39
40 /* Sequencer Registers */
41 0x00, 0x08, 0x03, 0x00, 0x07,
42
43 /* GC Registers */
44 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x0E, 0x0F, 0xFF,
45
46 /* CRTC Registers */
47 0x2D, 0x27, 0x28, 0x90, 0x2B, 0xA0, 0xBF, 0x1F, 0x00, 0x4F, 0x0D, 0x0E,
48 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x14, 0x1F, 0x96, 0xB9, 0xA3,
49 0xFF,
50
51 /* AC Registers */
52 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07, 0x38, 0x39, 0x3A, 0x3B,
53 0x3C, 0x3D, 0x3E, 0x3F, 0x0C, 0x00, 0x0F, 0x08, 0x00
54 };
55
56 static BYTE VideoMode_80x25_text[] =
57 {
58 /* Miscellaneous Register */
59 0x67,
60
61 /* Sequencer Registers */
62 0x00, 0x00, 0x03, 0x00, 0x07,
63
64 /* GC Registers */
65 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x0E, 0x0F, 0xFF,
66
67 /* CRTC Registers */
68 0x5F, 0x4F, 0x50, 0x82, 0x55, 0x81, 0xBF, 0x1F, 0x00, 0x4F, 0x0D, 0x0E,
69 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x28, 0x1F, 0x96, 0xB9, 0xA3,
70 0xFF,
71
72 /* AC Registers */
73 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07, 0x38, 0x39, 0x3A, 0x3B,
74 0x3C, 0x3D, 0x3E, 0x3F, 0x0C, 0x00, 0x0F, 0x08, 0x00
75 };
76
77 static BYTE VideoMode_320x200_4color[] =
78 {
79 /* Miscellaneous Register */
80 0x63,
81
82 /* Sequencer Registers */
83 0x00, 0x09, 0x00, 0x00, 0x02,
84
85 /* GC Registers */
86 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x0F, 0x0F, 0xFF,
87
88 /* CRTC Registers */
89 0x2D, 0x27, 0x28, 0x90, 0x2B, 0x80, 0xBF, 0x1F, 0x00, 0xC1, 0x00, 0x00,
90 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x14, 0x00, 0x96, 0xB9, 0xA2,
91 0xFF,
92
93 /* AC Registers */
94 0x00, 0x13, 0x15, 0x17, 0x02, 0x04, 0x06, 0x07, 0x10, 0x11, 0x12, 0x13,
95 0x14, 0x15, 0x16, 0x17, 0x01, 0x00, 0x0F, 0x00, 0x00
96 };
97
98 static BYTE VideoMode_640x200_2color[] =
99 {
100 /* Miscellaneous Register */
101 0x63,
102
103 /* Sequencer Registers */
104 0x00, 0x09, 0x0F, 0x00, 0x02,
105
106 /* GC Registers */
107 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0xFF,
108
109 /* CRTC Registers */
110 0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0xBF, 0x1F, 0x00, 0xC1, 0x00, 0x00,
111 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x28, 0x00, 0x96, 0xB9, 0xC2,
112 0xFF,
113
114 /* AC Registers */
115 0x00, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17,
116 0x17, 0x17, 0x17, 0x17, 0x01, 0x00, 0x01, 0x00, 0x00
117 };
118
119 static BYTE VideoMode_320x200_16color[] =
120 {
121 /* Miscellaneous Register */
122 0x63,
123
124 /* Sequencer Registers */
125 0x00, 0x09, 0x0F, 0x00, 0x02,
126
127 /* GC Registers */
128 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x0F, 0xFF,
129
130 /* CRTC Registers */
131 0x2D, 0x27, 0x28, 0x90, 0x2B, 0x80, 0xBF, 0x1F, 0x00, 0xC0, 0x00, 0x00,
132 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x14, 0x00, 0x96, 0xB9, 0xE3,
133 0xFF,
134
135 /* AC Registers */
136 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x10, 0x11, 0x12, 0x13,
137 0x14, 0x15, 0x16, 0x17, 0x01, 0x00, 0x0F, 0x00, 0x00
138 };
139
140 static BYTE VideoMode_640x200_16color[] =
141 {
142 /* Miscellaneous Register */
143 0x63,
144
145 /* Sequencer Registers */
146 0x00, 0x01, 0x0F, 0x00, 0x02,
147
148 /* GC Registers */
149 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x0F, 0xFF,
150
151 /* CRTC Registers */
152 0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0xBF, 0x1F, 0x00, 0xC0, 0x00, 0x00,
153 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x28, 0x00, 0x96, 0xB9, 0xE3,
154 0xFF,
155
156 /* AC Registers */
157 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x10, 0x11, 0x12, 0x13,
158 0x14, 0x15, 0x16, 0x17, 0x01, 0x00, 0x0F, 0x00, 0x00
159 };
160
161 static BYTE VideoMode_640x350_16color[] =
162 {
163 /* Miscellaneous Register */
164 0xA3,
165
166 /* Sequencer Registers */
167 0x00, 0x01, 0x0F, 0x00, 0x02,
168
169 /* GC Registers */
170 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x0F, 0xFF,
171
172 /* CRTC Registers */
173 0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0xBF, 0x1F, 0x00, 0x40, 0x00, 0x00,
174 0x00, 0x00, 0x00, 0x00, 0x83, 0x85, 0x5D, 0x28, 0x0F, 0x63, 0xBA, 0xE3,
175 0xFF,
176
177 /* AC Registers */
178 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07, 0x38, 0x39, 0x3A, 0x3B,
179 0x3C, 0x3D, 0x3E, 0x3F, 0x01, 0x00, 0x0F, 0x00, 0x00
180 };
181
182 static BYTE VideoMode_640x480_2color[] =
183 {
184 /* Miscellaneous Register */
185 0xE3,
186
187 /* Sequencer Registers */
188 0x00, 0x01, 0x0F, 0x00, 0x02,
189
190 /* GC Registers */
191 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x0F, 0xFF,
192
193 /* CRTC Registers */
194 0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0x0B, 0x3E, 0x00, 0x40, 0x00, 0x00,
195 0x00, 0x00, 0x00, 0x00, 0xEA, 0x8C, 0xDF, 0x28, 0x00, 0xE7, 0x04, 0xC3,
196 0xFF,
197
198 /* AC Registers */
199 0x00, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
200 0x3F, 0x3F, 0x3F, 0x3F, 0x01, 0x00, 0x0F, 0x00, 0x00
201 };
202
203 static BYTE VideoMode_640x480_16color[] =
204 {
205 /* Miscellaneous Register */
206 0xE3,
207
208 /* Sequencer Registers */
209 0x00, 0x01, 0x0F, 0x00, 0x02,
210
211 /* GC Registers */
212 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x0F, 0xFF,
213
214 /* CRTC Registers */
215 0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0x0B, 0x3E, 0x00, 0x40, 0x00, 0x00,
216 0x00, 0x00, 0x00, 0x00, 0xEA, 0x8C, 0xDF, 0x28, 0x00, 0xE7, 0x04, 0xE3,
217 0xFF,
218
219 /* AC Registers */
220 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07, 0x38, 0x39, 0x3A, 0x3B,
221 0x3C, 0x3D, 0x3E, 0x3F, 0x01, 0x00, 0x0F, 0x00, 0x00
222 };
223
224 static BYTE VideoMode_320x200_256color[] =
225 {
226 /* Miscellaneous Register */
227 0x63,
228
229 /* Sequencer Registers */
230 0x00, 0x01, 0x0F, 0x00, 0x0E,
231
232 /* GC Registers */
233 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x05, 0x0F, 0xFF,
234
235 /* CRTC Registers */
236 0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0xBF, 0x1F, 0x00, 0x41, 0x00, 0x00,
237 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x28, 0x40, 0x96, 0xB9, 0xA3,
238 0xFF,
239
240 /* AC Registers */
241 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
242 0x0C, 0x0D, 0x0E, 0x0F, 0x41, 0x00, 0x0F, 0x00, 0x00
243 };
244
245 static LPBYTE VideoModes[] =
246 {
247 VideoMode_40x25_text, /* Mode 00h */
248 VideoMode_40x25_text, /* Mode 01h */
249 VideoMode_80x25_text, /* Mode 02h */
250 VideoMode_80x25_text, /* Mode 03h */
251 VideoMode_320x200_4color, /* Mode 04h */
252 VideoMode_320x200_4color, /* Mode 05h */
253 VideoMode_640x200_2color, /* Mode 06h */
254 NULL, /* Mode 07h */
255 NULL, /* Mode 08h */
256 NULL, /* Mode 09h */
257 NULL, /* Mode 0Ah */
258 NULL, /* Mode 0Bh */
259 NULL, /* Mode 0Ch */
260 VideoMode_320x200_16color, /* Mode 0Dh */
261 VideoMode_640x200_16color, /* Mode 0Eh */
262 NULL, /* Mode 0Fh */
263 VideoMode_640x350_16color, /* Mode 10h */
264 VideoMode_640x480_2color, /* Mode 11h */
265 VideoMode_640x480_16color, /* Mode 12h */
266 VideoMode_320x200_256color, /* Mode 13h */
267 };
268
269 /* PRIVATE FUNCTIONS **********************************************************/
270
271 static BOOLEAN BiosKbdBufferPush(WORD Data)
272 {
273 /* Get the location of the element after the tail */
274 WORD NextElement = Bda->KeybdBufferTail + sizeof(WORD);
275
276 /* Wrap it around if it's at or beyond the end */
277 if (NextElement >= Bda->KeybdBufferEnd) NextElement = Bda->KeybdBufferStart;
278
279 /* If it's full, fail */
280 if (NextElement == Bda->KeybdBufferHead) return FALSE;
281
282 /* Put the value in the queue */
283 *((LPWORD)((ULONG_PTR)Bda + Bda->KeybdBufferTail)) = Data;
284 Bda->KeybdBufferTail += sizeof(WORD);
285
286 /* Check if we are at, or have passed, the end of the buffer */
287 if (Bda->KeybdBufferTail >= Bda->KeybdBufferEnd)
288 {
289 /* Return it to the beginning */
290 Bda->KeybdBufferTail = Bda->KeybdBufferStart;
291 }
292
293 /* Return success */
294 return TRUE;
295 }
296
297 static BOOLEAN BiosKbdBufferTop(LPWORD Data)
298 {
299 /* If it's empty, fail */
300 if (Bda->KeybdBufferHead == Bda->KeybdBufferTail) return FALSE;
301
302 /* Otherwise, get the value and return success */
303 *Data = *((LPWORD)((ULONG_PTR)Bda + Bda->KeybdBufferHead));
304
305 return TRUE;
306 }
307
308 static BOOLEAN BiosKbdBufferPop(VOID)
309 {
310 /* If it's empty, fail */
311 if (Bda->KeybdBufferHead == Bda->KeybdBufferTail) return FALSE;
312
313 /* Remove the value from the queue */
314 Bda->KeybdBufferHead += sizeof(WORD);
315
316 /* Check if we are at, or have passed, the end of the buffer */
317 if (Bda->KeybdBufferHead >= Bda->KeybdBufferEnd)
318 {
319 /* Return it to the beginning */
320 Bda->KeybdBufferHead = Bda->KeybdBufferStart;
321 }
322
323 /* Return success */
324 return TRUE;
325 }
326
327 static VOID BiosReadWindow(LPWORD Buffer, SMALL_RECT Rectangle, BYTE Page)
328 {
329 INT i, j;
330 INT Counter = 0;
331 WORD Character;
332 DWORD VideoAddress = TO_LINEAR(TEXT_VIDEO_SEG, Page * Bda->VideoPageSize);
333
334 for (i = Rectangle.Top; i <= Rectangle.Bottom; i++)
335 {
336 for (j = Rectangle.Left; j <= Rectangle.Right; j++)
337 {
338 /* Read from video memory */
339 VgaReadMemory(VideoAddress + (i * Bda->ScreenColumns + j) * sizeof(WORD),
340 (LPVOID)&Character,
341 sizeof(WORD));
342
343 /* Write the data to the buffer in row order */
344 Buffer[Counter++] = Character;
345 }
346 }
347 }
348
349 static VOID BiosWriteWindow(LPWORD Buffer, SMALL_RECT Rectangle, BYTE Page)
350 {
351 INT i, j;
352 INT Counter = 0;
353 WORD Character;
354 DWORD VideoAddress = TO_LINEAR(TEXT_VIDEO_SEG, Page * Bda->VideoPageSize);
355
356 for (i = Rectangle.Top; i <= Rectangle.Bottom; i++)
357 {
358 for (j = Rectangle.Left; j <= Rectangle.Right; j++)
359 {
360 Character = Buffer[Counter++];
361
362 /* Write to video memory */
363 VgaWriteMemory(VideoAddress + (i * Bda->ScreenColumns + j) * sizeof(WORD),
364 (LPVOID)&Character,
365 sizeof(WORD));
366 }
367 }
368 }
369
370 /* PUBLIC FUNCTIONS ***********************************************************/
371
372 BYTE BiosGetVideoMode(VOID)
373 {
374 return Bda->VideoMode;
375 }
376
377 BOOLEAN BiosSetVideoMode(BYTE ModeNumber)
378 {
379 INT i;
380 COORD Resolution;
381 LPBYTE Values = VideoModes[ModeNumber];
382
383 DPRINT1("Switching to mode %Xh; Values = 0x%p\n", ModeNumber, Values);
384
385 if (Values == NULL) return FALSE;
386
387 /* Write the misc register */
388 VgaWritePort(VGA_MISC_WRITE, *(Values++));
389
390 /* Write the sequencer registers */
391 for (i = 0; i < VGA_SEQ_MAX_REG; i++)
392 {
393 VgaWritePort(VGA_SEQ_INDEX, i);
394 VgaWritePort(VGA_SEQ_DATA, *(Values++));
395 }
396
397 /* Write the GC registers */
398 for (i = 0; i < VGA_GC_MAX_REG; i++)
399 {
400 VgaWritePort(VGA_GC_INDEX, i);
401 VgaWritePort(VGA_GC_DATA, *(Values++));
402 }
403
404 /* Write the CRTC registers */
405 for (i = 0; i < VGA_CRTC_MAX_REG; i++)
406 {
407 VgaWritePort(VGA_CRTC_INDEX, i);
408 VgaWritePort(VGA_CRTC_DATA, *(Values++));
409 }
410
411 /* Write the AC registers */
412 for (i = 0; i < VGA_AC_MAX_REG; i++)
413 {
414 VgaWritePort(VGA_AC_INDEX, i);
415 VgaWritePort(VGA_AC_WRITE, *(Values++));
416 }
417
418 /* Reset the palette */
419 VgaResetPalette();
420
421 /* Update the values in the BDA */
422 Bda->VideoMode = ModeNumber;
423 Bda->VideoPage = 0;
424 Bda->VideoPageSize = BIOS_PAGE_SIZE;
425 Bda->VideoPageOffset = 0;
426
427 /* Get the character height */
428 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_MAX_SCAN_LINE_REG);
429 Bda->CharacterHeight = 1 + (VgaReadPort(VGA_CRTC_DATA) & 0x1F);
430
431 Resolution = VgaGetDisplayResolution();
432 Bda->ScreenColumns = Resolution.X;
433 Bda->ScreenRows = Resolution.Y - 1;
434
435 return TRUE;
436 }
437
438 BOOLEAN BiosSetVideoPage(BYTE PageNumber)
439 {
440 /* Check if the page exists */
441 if (PageNumber >= BIOS_MAX_PAGES) return FALSE;
442
443 /* Check if this is the same page */
444 if (PageNumber == Bda->VideoPage) return TRUE;
445
446 /* Set the values in the BDA */
447 Bda->VideoPage = PageNumber;
448 Bda->VideoPageSize = BIOS_PAGE_SIZE;
449 Bda->VideoPageOffset = PageNumber * BIOS_PAGE_SIZE;
450
451 /* Set the start address in the CRTC */
452 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_LOC_LOW_REG);
453 VgaWritePort(VGA_CRTC_DATA , LOBYTE(Bda->VideoPageOffset));
454 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_LOC_HIGH_REG);
455 VgaWritePort(VGA_CRTC_DATA , HIBYTE(Bda->VideoPageOffset));
456
457 return TRUE;
458 }
459
460 BOOLEAN BiosInitialize(VOID)
461 {
462 USHORT i;
463 WORD Offset = 0;
464 LPWORD IntVecTable = (LPWORD)BaseAddress;
465 LPBYTE BiosCode = (LPBYTE)SEG_OFF_TO_PTR(BIOS_SEGMENT, 0);
466
467 /* Initialize the BDA */
468 Bda = (PBIOS_DATA_AREA)SEG_OFF_TO_PTR(BDA_SEGMENT, 0);
469 Bda->EquipmentList = BIOS_EQUIPMENT_LIST;
470 /*
471 * Conventional memory size is 640 kB,
472 * see: http://webpages.charter.net/danrollins/techhelp/0184.HTM
473 * and see Ralf Brown: http://www.ctyme.com/intr/rb-0598.htm
474 * for more information.
475 */
476 Bda->MemorySize = 0x0280;
477 Bda->KeybdBufferStart = FIELD_OFFSET(BIOS_DATA_AREA, KeybdBuffer);
478 Bda->KeybdBufferEnd = Bda->KeybdBufferStart + BIOS_KBD_BUFFER_SIZE * sizeof(WORD);
479
480 /* Generate ISR stubs and fill the IVT */
481 for (i = 0x00; i <= 0xFF; i++)
482 {
483 IntVecTable[i * 2] = Offset;
484 IntVecTable[i * 2 + 1] = BIOS_SEGMENT;
485
486 BiosCode[Offset++] = 0xFB; // sti
487
488 BiosCode[Offset++] = 0x6A; // push i
489 BiosCode[Offset++] = (UCHAR)i;
490
491 BiosCode[Offset++] = 0x6A; // push 0
492 BiosCode[Offset++] = 0x00;
493
494 // BOP_SEQ:
495 BiosCode[Offset++] = 0xF8; // clc
496
497 BiosCode[Offset++] = LOBYTE(EMULATOR_BOP); // BOP sequence
498 BiosCode[Offset++] = HIBYTE(EMULATOR_BOP);
499 BiosCode[Offset++] = EMULATOR_INT_BOP;
500
501 BiosCode[Offset++] = 0x73; // jnc EXIT (offset +3)
502 BiosCode[Offset++] = 0x03;
503
504 // HACK: The following instruction should be HLT!
505 BiosCode[Offset++] = 0x90; // nop
506
507 BiosCode[Offset++] = 0xEB; // jmp BOP_SEQ (offset -9)
508 BiosCode[Offset++] = 0xF7;
509
510 // EXIT:
511 BiosCode[Offset++] = 0x83; // add sp, 4
512 BiosCode[Offset++] = 0xC4;
513 BiosCode[Offset++] = 0x04;
514
515 BiosCode[Offset++] = 0xCF; // iret
516 }
517
518 /* Get the input handle to the real console, and check for success */
519 BiosConsoleInput = CreateFileW(L"CONIN$",
520 GENERIC_READ | GENERIC_WRITE,
521 FILE_SHARE_READ | FILE_SHARE_WRITE,
522 NULL,
523 OPEN_EXISTING,
524 0,
525 NULL);
526 if (BiosConsoleInput == INVALID_HANDLE_VALUE)
527 {
528 return FALSE;
529 }
530
531 /* Get the output handle to the real console, and check for success */
532 BiosConsoleOutput = CreateFileW(L"CONOUT$",
533 GENERIC_READ | GENERIC_WRITE,
534 FILE_SHARE_READ | FILE_SHARE_WRITE,
535 NULL,
536 OPEN_EXISTING,
537 0,
538 NULL);
539 if (BiosConsoleOutput == INVALID_HANDLE_VALUE)
540 {
541 CloseHandle(BiosConsoleInput);
542 return FALSE;
543 }
544
545 /* Save the console screen buffer information */
546 if (!GetConsoleScreenBufferInfo(BiosConsoleOutput, &BiosSavedBufferInfo))
547 {
548 CloseHandle(BiosConsoleOutput);
549 CloseHandle(BiosConsoleInput);
550 return FALSE;
551 }
552
553 /* Initialize VGA */
554 if (!VgaInitialize(BiosConsoleOutput))
555 {
556 CloseHandle(BiosConsoleOutput);
557 CloseHandle(BiosConsoleInput);
558 return FALSE;
559 }
560
561 /* Update the cursor position */
562 BiosSetCursorPosition(BiosSavedBufferInfo.dwCursorPosition.Y,
563 BiosSavedBufferInfo.dwCursorPosition.X,
564 0);
565
566 /* Set the console input mode */
567 SetConsoleMode(BiosConsoleInput, ENABLE_MOUSE_INPUT | ENABLE_PROCESSED_INPUT);
568
569 /* Start the input thread */
570 InputThread = CreateThread(NULL, 0, &InputThreadProc, BiosConsoleInput, 0, NULL);
571
572 /* Initialize the PIC */
573 PicWriteCommand(PIC_MASTER_CMD, PIC_ICW1 | PIC_ICW1_ICW4);
574 PicWriteCommand(PIC_SLAVE_CMD , PIC_ICW1 | PIC_ICW1_ICW4);
575
576 /* Set the interrupt offsets */
577 PicWriteData(PIC_MASTER_DATA, BIOS_PIC_MASTER_INT);
578 PicWriteData(PIC_SLAVE_DATA , BIOS_PIC_SLAVE_INT);
579
580 /* Tell the master PIC there is a slave at IRQ 2 */
581 PicWriteData(PIC_MASTER_DATA, 1 << 2);
582 PicWriteData(PIC_SLAVE_DATA , 2);
583
584 /* Make sure the PIC is in 8086 mode */
585 PicWriteData(PIC_MASTER_DATA, PIC_ICW4_8086);
586 PicWriteData(PIC_SLAVE_DATA , PIC_ICW4_8086);
587
588 /* Clear the masks for both PICs */
589 PicWriteData(PIC_MASTER_DATA, 0x00);
590 PicWriteData(PIC_SLAVE_DATA , 0x00);
591
592 PitWriteCommand(0x34);
593 PitWriteData(0, 0x00);
594 PitWriteData(0, 0x00);
595
596 return TRUE;
597 }
598
599 VOID BiosCleanup(VOID)
600 {
601 /* Restore the old screen buffer */
602 SetConsoleActiveScreenBuffer(BiosConsoleOutput);
603
604 /* Restore the screen buffer size */
605 SetConsoleScreenBufferSize(BiosConsoleOutput, BiosSavedBufferInfo.dwSize);
606
607 /* Close the console handles */
608 if (BiosConsoleOutput != INVALID_HANDLE_VALUE) CloseHandle(BiosConsoleOutput);
609 if (BiosConsoleInput != INVALID_HANDLE_VALUE) CloseHandle(BiosConsoleInput);
610
611 /* Close the input thread handle */
612 if (InputThread != NULL) CloseHandle(InputThread);
613 }
614
615 WORD BiosPeekCharacter(VOID)
616 {
617 WORD CharacterData = 0;
618
619 /* Get the key from the queue, but don't remove it */
620 if (BiosKbdBufferTop(&CharacterData)) return CharacterData;
621 else return 0xFFFF;
622 }
623
624 WORD BiosGetCharacter(VOID)
625 {
626 WORD CharacterData = 0;
627
628 /* Check if there is a key available */
629 if (Bda->KeybdBufferHead != Bda->KeybdBufferTail)
630 {
631 /* Get the key from the queue, and remove it */
632 BiosKbdBufferTop(&CharacterData);
633 BiosKbdBufferPop();
634 }
635 else
636 {
637 /* Set the handler CF to repeat the BOP */
638 EmulatorSetFlag(EMULATOR_FLAG_CF);
639 }
640
641 return CharacterData;
642 }
643
644 VOID BiosSetCursorPosition(BYTE Row, BYTE Column, BYTE Page)
645 {
646 /* Make sure the selected video page is valid */
647 if (Page >= BIOS_MAX_PAGES) return;
648
649 /* Update the position in the BDA */
650 Bda->CursorPosition[Page] = (Row << 8) | Column;
651
652 /* Check if this is the current video page */
653 if (Page == Bda->VideoPage)
654 {
655 WORD Offset = Row * Bda->ScreenColumns + Column;
656
657 /* Modify the CRTC registers */
658 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_LOC_LOW_REG);
659 VgaWritePort(VGA_CRTC_DATA , LOBYTE(Offset));
660 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_LOC_HIGH_REG);
661 VgaWritePort(VGA_CRTC_DATA , HIBYTE(Offset));
662 }
663 }
664
665 BOOLEAN BiosScrollWindow(INT Direction,
666 DWORD Amount,
667 SMALL_RECT Rectangle,
668 BYTE Page,
669 BYTE FillAttribute)
670 {
671 DWORD i;
672 LPWORD WindowData;
673 DWORD WindowSize = (Rectangle.Bottom - Rectangle.Top + 1)
674 * (Rectangle.Right - Rectangle.Left + 1);
675
676 /* Allocate a buffer for the window */
677 WindowData = (LPWORD)HeapAlloc(GetProcessHeap(),
678 HEAP_ZERO_MEMORY,
679 WindowSize * sizeof(WORD));
680 if (WindowData == NULL) return FALSE;
681
682 /* Read the window data */
683 BiosReadWindow(WindowData, Rectangle, Page);
684
685 if (Amount == 0)
686 {
687 /* Fill the window */
688 for (i = 0; i < WindowSize; i++)
689 {
690 WindowData[i] = ' ' | (FillAttribute << 8);
691 }
692
693 goto Done;
694 }
695
696 // TODO: Scroll the window!
697
698 Done:
699 /* Write back the window data */
700 BiosWriteWindow(WindowData, Rectangle, Page);
701
702 /* Free the window buffer */
703 HeapFree(GetProcessHeap(), 0, WindowData);
704
705 return TRUE;
706 }
707
708 VOID BiosPrintCharacter(CHAR Character, BYTE Attribute, BYTE Page)
709 {
710 WORD CharData = (Attribute << 8) | Character;
711 BYTE Row, Column;
712
713 /* Make sure the page exists */
714 if (Page >= BIOS_MAX_PAGES) return;
715
716 /* Get the cursor location */
717 Row = HIBYTE(Bda->CursorPosition[Page]);
718 Column = LOBYTE(Bda->CursorPosition[Page]);
719
720 if (Character == '\a')
721 {
722 /* Bell control character */
723 // NOTE: We may use what the terminal emulator offers to us...
724 Beep(800, 200);
725 return;
726 }
727 else if (Character == '\b')
728 {
729 /* Backspace control character */
730 if (Column > 0)
731 {
732 Column--;
733 }
734 else if (Row > 0)
735 {
736 Column = Bda->ScreenColumns - 1;
737 Row--;
738 }
739
740 /* Erase the existing character */
741 CharData = (Attribute << 8) | ' ';
742 VgaWriteMemory(TO_LINEAR(TEXT_VIDEO_SEG,
743 Page * Bda->VideoPageSize
744 + (Row * Bda->ScreenColumns + Column) * sizeof(WORD)),
745 (LPVOID)&CharData,
746 sizeof(WORD));
747 }
748 else if (Character == '\n')
749 {
750 /* Line Feed control character */
751 Row++;
752 }
753 else if (Character == '\r')
754 {
755 /* Carriage Return control character */
756 Column = 0;
757 }
758 else
759 {
760 /* Default character */
761
762 /* Write the character */
763 VgaWriteMemory(TO_LINEAR(TEXT_VIDEO_SEG,
764 Page * Bda->VideoPageSize
765 + (Row * Bda->ScreenColumns + Column) * sizeof(WORD)),
766 (LPVOID)&CharData,
767 sizeof(WORD));
768
769 /* Advance the cursor */
770 Column++;
771 }
772
773 /* Check if it passed the end of the row */
774 if (Column >= Bda->ScreenColumns)
775 {
776 /* Return to the first column and go to the next line */
777 Column = 0;
778 Row++;
779 }
780
781 /* Scroll the screen up if needed */
782 if (Row > Bda->ScreenRows)
783 {
784 /* The screen must be scrolled up */
785 SMALL_RECT Rectangle = { 0, 0, Bda->ScreenColumns - 1, Bda->ScreenRows };
786
787 BiosScrollWindow(SCROLL_DIRECTION_UP,
788 1,
789 Rectangle,
790 Page,
791 DEFAULT_ATTRIBUTE);
792 }
793
794 /* Set the cursor position */
795 BiosSetCursorPosition(Row, Column, Page);
796 }
797
798 VOID BiosVideoService(LPWORD Stack)
799 {
800 switch (getAH())
801 {
802 /* Set Video Mode */
803 case 0x00:
804 {
805 BiosSetVideoMode(getAL());
806 VgaClearMemory();
807 break;
808 }
809
810 /* Set Text-Mode Cursor Shape */
811 case 0x01:
812 {
813 /* Update the BDA */
814 Bda->CursorStartLine = getCH();
815 Bda->CursorEndLine = getCL();
816
817 /* Modify the CRTC registers */
818 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_START_REG);
819 VgaWritePort(VGA_CRTC_DATA , Bda->CursorStartLine);
820 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_END_REG);
821 VgaWritePort(VGA_CRTC_DATA , Bda->CursorEndLine);
822
823 break;
824 }
825
826 /* Set Cursor Position */
827 case 0x02:
828 {
829 BiosSetCursorPosition(getDH(), getDL(), getBH());
830 break;
831 }
832
833 /* Get Cursor Position */
834 case 0x03:
835 {
836 /* Make sure the selected video page exists */
837 if (getBH() >= BIOS_MAX_PAGES) break;
838
839 /* Return the result */
840 setAX(0);
841 setCX(MAKEWORD(Bda->CursorEndLine, Bda->CursorStartLine));
842 setDX(Bda->CursorPosition[getBH()]);
843 break;
844 }
845
846 /* Query Light Pen */
847 case 0x04:
848 {
849 /*
850 * On modern BIOSes, this function returns 0
851 * so that we can ignore the other registers.
852 */
853 setAX(0);
854 break;
855 }
856
857 /* Select Active Display Page */
858 case 0x05:
859 {
860 BiosSetVideoPage(getAL());
861 break;
862 }
863
864 /* Scroll Window Up/Down */
865 case 0x06:
866 case 0x07:
867 {
868 SMALL_RECT Rectangle = { getCL(), getCH(), getDL(), getDH() };
869
870 /* Call the internal function */
871 BiosScrollWindow((getAH() == 0x06) ? SCROLL_DIRECTION_UP
872 : SCROLL_DIRECTION_DOWN,
873 getAL(),
874 Rectangle,
875 Bda->VideoPage,
876 getBH());
877
878 break;
879 }
880
881 /* Read/Write Character From Cursor Position */
882 case 0x08:
883 case 0x09:
884 case 0x0A:
885 {
886 WORD CharacterData = MAKEWORD(getAL(), getBL());
887 BYTE Page = getBH();
888 DWORD Offset;
889
890 /* Check if the page exists */
891 if (Page >= BIOS_MAX_PAGES) break;
892
893 /* Find the offset of the character */
894 Offset = Page * Bda->VideoPageSize +
895 (HIBYTE(Bda->CursorPosition[Page]) * Bda->ScreenColumns +
896 LOBYTE(Bda->CursorPosition[Page])) * 2;
897
898 if (getAH() == 0x08)
899 {
900 /* Read from the video memory */
901 VgaReadMemory(TO_LINEAR(TEXT_VIDEO_SEG, Offset),
902 (LPVOID)&CharacterData,
903 sizeof(WORD));
904
905 /* Return the character in AX */
906 setAX(CharacterData);
907 }
908 else
909 {
910 /* Write to video memory */
911 VgaWriteMemory(TO_LINEAR(TEXT_VIDEO_SEG, Offset),
912 (LPVOID)&CharacterData,
913 (getBH() == 0x09) ? sizeof(WORD) : sizeof(BYTE));
914 }
915
916 break;
917 }
918
919 /* Teletype Output */
920 case 0x0E:
921 {
922 BiosPrintCharacter(getAL(), getBL(), getBH());
923 break;
924 }
925
926 /* Get Current Video Mode */
927 case 0x0F:
928 {
929 setAX(MAKEWORD(Bda->VideoMode, Bda->ScreenColumns));
930 setBX(MAKEWORD(getBL(), Bda->VideoPage));
931 break;
932 }
933
934 /* Palette Control */
935 case 0x10:
936 {
937 switch (getAL())
938 {
939 /* Set Single Palette Register */
940 case 0x00:
941 {
942 /* Reset the flip-flop */
943 VgaReadPort(VGA_STAT_COLOR);
944
945 /* Write the index */
946 VgaWritePort(VGA_AC_INDEX, getBL());
947
948 /* Write the data */
949 VgaWritePort(VGA_AC_WRITE, getBH());
950
951 break;
952 }
953
954 /* Set Overscan Color */
955 case 0x01:
956 {
957 /* Reset the flip-flop */
958 VgaReadPort(VGA_STAT_COLOR);
959
960 /* Write the index */
961 VgaWritePort(VGA_AC_INDEX, VGA_AC_OVERSCAN_REG);
962
963 /* Write the data */
964 VgaWritePort(VGA_AC_WRITE, getBH());
965
966 break;
967 }
968
969 /* Set All Palette Registers */
970 case 0x02:
971 {
972 INT i;
973 LPBYTE Buffer = SEG_OFF_TO_PTR(getES(), getDX());
974
975 /* Set the palette registers */
976 for (i = 0; i <= VGA_AC_PAL_F_REG; i++)
977 {
978 /* Reset the flip-flop */
979 VgaReadPort(VGA_STAT_COLOR);
980
981 /* Write the index */
982 VgaWritePort(VGA_AC_INDEX, i);
983
984 /* Write the data */
985 VgaWritePort(VGA_AC_WRITE, Buffer[i]);
986 }
987
988 /* Set the overscan register */
989 VgaWritePort(VGA_AC_INDEX, VGA_AC_OVERSCAN_REG);
990 VgaWritePort(VGA_AC_WRITE, Buffer[VGA_AC_PAL_F_REG + 1]);
991
992 break;
993 }
994
995 /* Get Single Palette Register */
996 case 0x07:
997 {
998 /* Reset the flip-flop */
999 VgaReadPort(VGA_STAT_COLOR);
1000
1001 /* Write the index */
1002 VgaWritePort(VGA_AC_INDEX, getBL());
1003
1004 /* Read the data */
1005 setBH(VgaReadPort(VGA_AC_READ));
1006
1007 break;
1008 }
1009
1010 /* Get Overscan Color */
1011 case 0x08:
1012 {
1013 /* Reset the flip-flop */
1014 VgaReadPort(VGA_STAT_COLOR);
1015
1016 /* Write the index */
1017 VgaWritePort(VGA_AC_INDEX, VGA_AC_OVERSCAN_REG);
1018
1019 /* Read the data */
1020 setBH(VgaReadPort(VGA_AC_READ));
1021
1022 break;
1023 }
1024
1025 /* Get All Palette Registers */
1026 case 0x09:
1027 {
1028 INT i;
1029 LPBYTE Buffer = SEG_OFF_TO_PTR(getES(), getDX());
1030
1031 /* Get the palette registers */
1032 for (i = 0; i <= VGA_AC_PAL_F_REG; i++)
1033 {
1034 /* Reset the flip-flop */
1035 VgaReadPort(VGA_STAT_COLOR);
1036
1037 /* Write the index */
1038 VgaWritePort(VGA_AC_INDEX, i);
1039
1040 /* Read the data */
1041 Buffer[i] = VgaReadPort(VGA_AC_READ);
1042 }
1043
1044 /* Get the overscan register */
1045 VgaWritePort(VGA_AC_INDEX, VGA_AC_OVERSCAN_REG);
1046 Buffer[VGA_AC_PAL_F_REG + 1] = VgaReadPort(VGA_AC_READ);
1047
1048 break;
1049 }
1050
1051 /* Set Individual DAC Register */
1052 case 0x10:
1053 {
1054 /* Write the index */
1055 // Certainly in BL and not in BX as said by Ralf Brown...
1056 VgaWritePort(VGA_DAC_WRITE_INDEX, getBL());
1057
1058 /* Write the data in this order: Red, Green, Blue */
1059 VgaWritePort(VGA_DAC_DATA, getDH());
1060 VgaWritePort(VGA_DAC_DATA, getCH());
1061 VgaWritePort(VGA_DAC_DATA, getCL());
1062
1063 break;
1064 }
1065
1066 /* Set Block of DAC Registers */
1067 case 0x12:
1068 {
1069 INT i;
1070 LPBYTE Buffer = SEG_OFF_TO_PTR(getES(), getDX());
1071
1072 /* Write the index */
1073 // Certainly in BL and not in BX as said by Ralf Brown...
1074 VgaWritePort(VGA_DAC_WRITE_INDEX, getBL());
1075
1076 for (i = 0; i < getCX(); i++)
1077 {
1078 /* Write the data in this order: Red, Green, Blue */
1079 VgaWritePort(VGA_DAC_DATA, *Buffer++);
1080 VgaWritePort(VGA_DAC_DATA, *Buffer++);
1081 VgaWritePort(VGA_DAC_DATA, *Buffer++);
1082 }
1083
1084 break;
1085 }
1086
1087 /* Get Individual DAC Register */
1088 case 0x15:
1089 {
1090 /* Write the index */
1091 VgaWritePort(VGA_DAC_READ_INDEX, getBL());
1092
1093 /* Read the data in this order: Red, Green, Blue */
1094 setDH(VgaReadPort(VGA_DAC_DATA));
1095 setCH(VgaReadPort(VGA_DAC_DATA));
1096 setCL(VgaReadPort(VGA_DAC_DATA));
1097
1098 break;
1099 }
1100
1101 /* Get Block of DAC Registers */
1102 case 0x17:
1103 {
1104 INT i;
1105 LPBYTE Buffer = SEG_OFF_TO_PTR(getES(), getDX());
1106
1107 /* Write the index */
1108 // Certainly in BL and not in BX as said by Ralf Brown...
1109 VgaWritePort(VGA_DAC_READ_INDEX, getBL());
1110
1111 for (i = 0; i < getCX(); i++)
1112 {
1113 /* Write the data in this order: Red, Green, Blue */
1114 *Buffer++ = VgaReadPort(VGA_DAC_DATA);
1115 *Buffer++ = VgaReadPort(VGA_DAC_DATA);
1116 *Buffer++ = VgaReadPort(VGA_DAC_DATA);
1117 }
1118
1119 break;
1120 }
1121
1122 default:
1123 {
1124 DPRINT1("BIOS Palette Control Sub-command AL = 0x%02X NOT IMPLEMENTED\n",
1125 getAL());
1126 break;
1127 }
1128 }
1129
1130 break;
1131 }
1132
1133 /* Scroll Window */
1134 case 0x12:
1135 {
1136 SMALL_RECT Rectangle = { getCL(), getCH(), getDL(), getDH() };
1137
1138 /* Call the internal function */
1139 BiosScrollWindow(getBL(),
1140 getAL(),
1141 Rectangle,
1142 Bda->VideoPage,
1143 DEFAULT_ATTRIBUTE);
1144
1145 break;
1146 }
1147
1148 /* Display combination code */
1149 case 0x1A:
1150 {
1151 switch(getAL())
1152 {
1153 case 0x00: /* Get Display combiantion code */
1154 setAX(MAKEWORD(0x1A, 0x1A));
1155 setBX(MAKEWORD(0x08, 0x00)); /* VGA w/ color analog display */
1156 break;
1157 case 0x01: /* Set Display combination code */
1158 DPRINT1("Set Display combination code - Unsupported\n");
1159 break;
1160 default:
1161 break;
1162 }
1163 break;
1164 }
1165
1166 default:
1167 {
1168 DPRINT1("BIOS Function INT 10h, AH = 0x%02X NOT IMPLEMENTED\n",
1169 getAH());
1170 }
1171 }
1172 }
1173
1174 VOID BiosKeyboardService(LPWORD Stack)
1175 {
1176 switch (getAH())
1177 {
1178 /* Wait for keystroke and read */
1179 case 0x00:
1180 /* Wait for extended keystroke and read */
1181 case 0x10: // FIXME: Temporarily do the same as INT 16h, 00h
1182 {
1183 /* Read the character (and wait if necessary) */
1184 setAX(BiosGetCharacter());
1185 break;
1186 }
1187
1188 /* Get keystroke status */
1189 case 0x01:
1190 /* Get extended keystroke status */
1191 case 0x11: // FIXME: Temporarily do the same as INT 16h, 01h
1192 {
1193 WORD Data = BiosPeekCharacter();
1194
1195 if (Data != 0xFFFF)
1196 {
1197 /* There is a character, clear ZF and return it */
1198 Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_ZF;
1199 setAX(Data);
1200 }
1201 else
1202 {
1203 /* No character, set ZF */
1204 Stack[STACK_FLAGS] |= EMULATOR_FLAG_ZF;
1205 }
1206
1207 break;
1208 }
1209
1210 /* Get shift status */
1211 case 0x02:
1212 {
1213 /* Return the lower byte of the keyboard shift status word */
1214 setAL(LOBYTE(Bda->KeybdShiftFlags));
1215 break;
1216 }
1217
1218 /* Reserved */
1219 case 0x04:
1220 {
1221 DPRINT1("BIOS Function INT 16h, AH = 0x04 is RESERVED\n");
1222 break;
1223 }
1224
1225 /* Push keystroke */
1226 case 0x05:
1227 {
1228 /* Return 0 if success, 1 if failure */
1229 setAL(BiosKbdBufferPush(getCX()) == FALSE);
1230 break;
1231 }
1232
1233 /* Get extended shift status */
1234 case 0x12:
1235 {
1236 /*
1237 * Be careful! The returned word is similar to Bda->KeybdShiftFlags
1238 * but the high byte is organized differently:
1239 * the bytes 2 and 3 of the high byte are not the same...
1240 */
1241 WORD KeybdShiftFlags = (Bda->KeybdShiftFlags & 0xF3FF);
1242
1243 /* Return the extended keyboard shift status word */
1244 setAX(KeybdShiftFlags);
1245 break;
1246 }
1247
1248 default:
1249 {
1250 DPRINT1("BIOS Function INT 16h, AH = 0x%02X NOT IMPLEMENTED\n",
1251 getAH());
1252 }
1253 }
1254 }
1255
1256 VOID BiosTimeService(LPWORD Stack)
1257 {
1258 switch (getAH())
1259 {
1260 case 0x00:
1261 {
1262 /* Set AL to 1 if midnight had passed, 0 otherwise */
1263 setAL(Bda->MidnightPassed ? 0x01 : 0x00);
1264
1265 /* Return the tick count in CX:DX */
1266 setCX(HIWORD(Bda->TickCounter));
1267 setDX(LOWORD(Bda->TickCounter));
1268
1269 /* Reset the midnight flag */
1270 Bda->MidnightPassed = FALSE;
1271
1272 break;
1273 }
1274
1275 case 0x01:
1276 {
1277 /* Set the tick count to CX:DX */
1278 Bda->TickCounter = MAKELONG(getDX(), getCX());
1279
1280 /* Reset the midnight flag */
1281 Bda->MidnightPassed = FALSE;
1282
1283 break;
1284 }
1285
1286 default:
1287 {
1288 DPRINT1("BIOS Function INT 1Ah, AH = 0x%02X NOT IMPLEMENTED\n",
1289 getAH());
1290 }
1291 }
1292 }
1293
1294 VOID BiosSystemTimerInterrupt(LPWORD Stack)
1295 {
1296 /* Increase the system tick count */
1297 Bda->TickCounter++;
1298 }
1299
1300 VOID BiosEquipmentService(LPWORD Stack)
1301 {
1302 /* Return the equipment list */
1303 setAX(Bda->EquipmentList);
1304 }
1305
1306 VOID BiosGetMemorySize(LPWORD Stack)
1307 {
1308 /* Return the conventional memory size in kB, typically 640 kB */
1309 setAX(Bda->MemorySize);
1310 }
1311
1312 VOID BiosHandleIrq(BYTE IrqNumber, LPWORD Stack)
1313 {
1314 switch (IrqNumber)
1315 {
1316 /* PIT IRQ */
1317 case 0:
1318 {
1319 /* Perform the system timer interrupt */
1320 EmulatorInterrupt(BIOS_SYS_TIMER_INTERRUPT);
1321 break;
1322 }
1323
1324 /* Keyboard IRQ */
1325 case 1:
1326 {
1327 BYTE ScanCode, VirtualKey;
1328 WORD Character;
1329
1330 /* Loop while there is a scancode available */
1331 do
1332 {
1333 /* Get the scan code and virtual key code */
1334 ScanCode = KeyboardReadData();
1335 VirtualKey = MapVirtualKey(ScanCode & 0x7F, MAPVK_VSC_TO_VK);
1336
1337 /* Check if this is a key press or release */
1338 if (!(ScanCode & (1 << 7)))
1339 {
1340 /* Key press */
1341 if (VirtualKey == VK_NUMLOCK ||
1342 VirtualKey == VK_CAPITAL ||
1343 VirtualKey == VK_SCROLL ||
1344 VirtualKey == VK_INSERT)
1345 {
1346 /* For toggle keys, toggle the lowest bit in the keyboard map */
1347 BiosKeyboardMap[VirtualKey] ^= ~(1 << 0);
1348 }
1349
1350 /* Set the highest bit */
1351 BiosKeyboardMap[VirtualKey] |= (1 << 7);
1352
1353 /* Find out which character this is */
1354 Character = 0;
1355 if (ToAscii(VirtualKey, ScanCode, BiosKeyboardMap, &Character, 0) == 0)
1356 {
1357 /* Not ASCII */
1358 Character = 0;
1359 }
1360
1361 /* Push it onto the BIOS keyboard queue */
1362 BiosKbdBufferPush(MAKEWORD(Character, ScanCode));
1363 }
1364 else
1365 {
1366 /* Key release, unset the highest bit */
1367 BiosKeyboardMap[VirtualKey] &= ~(1 << 7);
1368 }
1369 }
1370 while (KeyboardReadStatus() & 1);
1371
1372 /* Clear the keyboard flags */
1373 Bda->KeybdShiftFlags = 0;
1374
1375 /* Set the appropriate flags based on the state */
1376 if (BiosKeyboardMap[VK_RSHIFT] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_RSHIFT;
1377 if (BiosKeyboardMap[VK_LSHIFT] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_LSHIFT;
1378 if (BiosKeyboardMap[VK_CONTROL] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_CTRL;
1379 if (BiosKeyboardMap[VK_MENU] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_ALT;
1380 if (BiosKeyboardMap[VK_SCROLL] & (1 << 0)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_SCROLL_ON;
1381 if (BiosKeyboardMap[VK_NUMLOCK] & (1 << 0)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_NUMLOCK_ON;
1382 if (BiosKeyboardMap[VK_CAPITAL] & (1 << 0)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_CAPSLOCK_ON;
1383 if (BiosKeyboardMap[VK_INSERT] & (1 << 0)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_INSERT_ON;
1384 if (BiosKeyboardMap[VK_RMENU] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_RALT;
1385 if (BiosKeyboardMap[VK_LMENU] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_LALT;
1386 if (BiosKeyboardMap[VK_SNAPSHOT] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_SYSRQ;
1387 if (BiosKeyboardMap[VK_PAUSE] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_PAUSE;
1388 if (BiosKeyboardMap[VK_SCROLL] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_SCROLL;
1389 if (BiosKeyboardMap[VK_NUMLOCK] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_NUMLOCK;
1390 if (BiosKeyboardMap[VK_CAPITAL] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_CAPSLOCK;
1391 if (BiosKeyboardMap[VK_INSERT] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_INSERT;
1392
1393 break;
1394 }
1395 }
1396
1397 /* Send End-of-Interrupt to the PIC */
1398 if (IrqNumber >= 8) PicWriteCommand(PIC_SLAVE_CMD, PIC_OCW2_EOI);
1399 PicWriteCommand(PIC_MASTER_CMD, PIC_OCW2_EOI);
1400 }
1401
1402 /* EOF */
A free Windows-compatible Operating System