2363e5ba00f63f2a738470316f9e82c5e010690a
[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 "emulator.h"
14 #include "bios.h"
15
16 #include "vga.h"
17 #include "pic.h"
18 #include "ps2.h"
19 #include "timer.h"
20
21 #include "int32.h"
22 #include "registers.h"
23
24 /* PRIVATE VARIABLES **********************************************************/
25
26 PBIOS_DATA_AREA Bda;
27 static BYTE BiosKeyboardMap[256];
28 static HANDLE BiosConsoleInput = INVALID_HANDLE_VALUE;
29 static HANDLE BiosConsoleOutput = INVALID_HANDLE_VALUE;
30 static CONSOLE_SCREEN_BUFFER_INFO BiosSavedBufferInfo;
31 static HANDLE InputThread = NULL;
32
33 /*
34 * VGA Register Configurations for BIOS Video Modes
35 * The configurations come from DosBox.
36 */
37 static BYTE VideoMode_40x25_text[] =
38 {
39 /* Miscellaneous Register */
40 0x67,
41
42 /* Sequencer Registers */
43 0x00, 0x08, 0x03, 0x00, 0x07,
44
45 /* GC Registers */
46 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x0E, 0x0F, 0xFF,
47
48 /* CRTC Registers */
49 0x2D, 0x27, 0x28, 0x90, 0x2B, 0xA0, 0xBF, 0x1F, 0x00, 0x4F, 0x0D, 0x0E,
50 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x14, 0x1F, 0x96, 0xB9, 0xA3,
51 0xFF,
52
53 /* AC Registers */
54 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07, 0x38, 0x39, 0x3A, 0x3B,
55 0x3C, 0x3D, 0x3E, 0x3F, 0x0C, 0x00, 0x0F, 0x08, 0x00
56 };
57
58 static BYTE VideoMode_80x25_text[] =
59 {
60 /* Miscellaneous Register */
61 0x67,
62
63 /* Sequencer Registers */
64 0x00, 0x00, 0x03, 0x00, 0x07,
65
66 /* GC Registers */
67 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x0E, 0x0F, 0xFF,
68
69 /* CRTC Registers */
70 0x5F, 0x4F, 0x50, 0x82, 0x55, 0x81, 0xBF, 0x1F, 0x00, 0x4F, 0x0D, 0x0E,
71 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x28, 0x1F, 0x96, 0xB9, 0xA3,
72 0xFF,
73
74 /* AC Registers */
75 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07, 0x38, 0x39, 0x3A, 0x3B,
76 0x3C, 0x3D, 0x3E, 0x3F, 0x0C, 0x00, 0x0F, 0x08, 0x00
77 };
78
79 static BYTE VideoMode_320x200_4color[] =
80 {
81 /* Miscellaneous Register */
82 0x63,
83
84 /* Sequencer Registers */
85 0x00, 0x09, 0x00, 0x00, 0x02,
86
87 /* GC Registers */
88 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x0F, 0x0F, 0xFF,
89
90 /* CRTC Registers */
91 0x2D, 0x27, 0x28, 0x90, 0x2B, 0x80, 0xBF, 0x1F, 0x00, 0xC1, 0x00, 0x00,
92 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x14, 0x00, 0x96, 0xB9, 0xA2,
93 0xFF,
94
95 /* AC Registers */
96 0x00, 0x13, 0x15, 0x17, 0x02, 0x04, 0x06, 0x07, 0x10, 0x11, 0x12, 0x13,
97 0x14, 0x15, 0x16, 0x17, 0x01, 0x00, 0x0F, 0x00, 0x00
98 };
99
100 static BYTE VideoMode_640x200_2color[] =
101 {
102 /* Miscellaneous Register */
103 0x63,
104
105 /* Sequencer Registers */
106 0x00, 0x09, 0x0F, 0x00, 0x02,
107
108 /* GC Registers */
109 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0xFF,
110
111 /* CRTC Registers */
112 0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0xBF, 0x1F, 0x00, 0xC1, 0x00, 0x00,
113 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x28, 0x00, 0x96, 0xB9, 0xC2,
114 0xFF,
115
116 /* AC Registers */
117 0x00, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17,
118 0x17, 0x17, 0x17, 0x17, 0x01, 0x00, 0x01, 0x00, 0x00
119 };
120
121 static BYTE VideoMode_320x200_16color[] =
122 {
123 /* Miscellaneous Register */
124 0x63,
125
126 /* Sequencer Registers */
127 0x00, 0x09, 0x0F, 0x00, 0x02,
128
129 /* GC Registers */
130 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x0F, 0xFF,
131
132 /* CRTC Registers */
133 0x2D, 0x27, 0x28, 0x90, 0x2B, 0x80, 0xBF, 0x1F, 0x00, 0xC0, 0x00, 0x00,
134 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x14, 0x00, 0x96, 0xB9, 0xE3,
135 0xFF,
136
137 /* AC Registers */
138 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x10, 0x11, 0x12, 0x13,
139 0x14, 0x15, 0x16, 0x17, 0x01, 0x00, 0x0F, 0x00, 0x00
140 };
141
142 static BYTE VideoMode_640x200_16color[] =
143 {
144 /* Miscellaneous Register */
145 0x63,
146
147 /* Sequencer Registers */
148 0x00, 0x01, 0x0F, 0x00, 0x02,
149
150 /* GC Registers */
151 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x0F, 0xFF,
152
153 /* CRTC Registers */
154 0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0xBF, 0x1F, 0x00, 0xC0, 0x00, 0x00,
155 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x28, 0x00, 0x96, 0xB9, 0xE3,
156 0xFF,
157
158 /* AC Registers */
159 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x10, 0x11, 0x12, 0x13,
160 0x14, 0x15, 0x16, 0x17, 0x01, 0x00, 0x0F, 0x00, 0x00
161 };
162
163 static BYTE VideoMode_640x350_16color[] =
164 {
165 /* Miscellaneous Register */
166 0xA3,
167
168 /* Sequencer Registers */
169 0x00, 0x01, 0x0F, 0x00, 0x02,
170
171 /* GC Registers */
172 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x0F, 0xFF,
173
174 /* CRTC Registers */
175 0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0xBF, 0x1F, 0x00, 0x40, 0x00, 0x00,
176 0x00, 0x00, 0x00, 0x00, 0x83, 0x85, 0x5D, 0x28, 0x0F, 0x63, 0xBA, 0xE3,
177 0xFF,
178
179 /* AC Registers */
180 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07, 0x38, 0x39, 0x3A, 0x3B,
181 0x3C, 0x3D, 0x3E, 0x3F, 0x01, 0x00, 0x0F, 0x00, 0x00
182 };
183
184 static BYTE VideoMode_640x480_2color[] =
185 {
186 /* Miscellaneous Register */
187 0xE3,
188
189 /* Sequencer Registers */
190 0x00, 0x01, 0x0F, 0x00, 0x02,
191
192 /* GC Registers */
193 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x0F, 0xFF,
194
195 /* CRTC Registers */
196 0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0x0B, 0x3E, 0x00, 0x40, 0x00, 0x00,
197 0x00, 0x00, 0x00, 0x00, 0xEA, 0x8C, 0xDF, 0x28, 0x00, 0xE7, 0x04, 0xC3,
198 0xFF,
199
200 /* AC Registers */
201 0x00, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
202 0x3F, 0x3F, 0x3F, 0x3F, 0x01, 0x00, 0x0F, 0x00, 0x00
203 };
204
205 static BYTE VideoMode_640x480_16color[] =
206 {
207 /* Miscellaneous Register */
208 0xE3,
209
210 /* Sequencer Registers */
211 0x00, 0x01, 0x0F, 0x00, 0x02,
212
213 /* GC Registers */
214 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x0F, 0xFF,
215
216 /* CRTC Registers */
217 0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0x0B, 0x3E, 0x00, 0x40, 0x00, 0x00,
218 0x00, 0x00, 0x00, 0x00, 0xEA, 0x8C, 0xDF, 0x28, 0x00, 0xE7, 0x04, 0xE3,
219 0xFF,
220
221 /* AC Registers */
222 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07, 0x38, 0x39, 0x3A, 0x3B,
223 0x3C, 0x3D, 0x3E, 0x3F, 0x01, 0x00, 0x0F, 0x00, 0x00
224 };
225
226 static BYTE VideoMode_320x200_256color[] =
227 {
228 /* Miscellaneous Register */
229 0x63,
230
231 /* Sequencer Registers */
232 0x00, 0x01, 0x0F, 0x00, 0x0E,
233
234 /* GC Registers */
235 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x05, 0x0F, 0xFF,
236
237 /* CRTC Registers */
238 0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0xBF, 0x1F, 0x00, 0x41, 0x00, 0x00,
239 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x28, 0x40, 0x96, 0xB9, 0xA3,
240 0xFF,
241
242 /* AC Registers */
243 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
244 0x0C, 0x0D, 0x0E, 0x0F, 0x41, 0x00, 0x0F, 0x00, 0x00
245 };
246
247 static LPBYTE VideoModes[] =
248 {
249 VideoMode_40x25_text, /* Mode 00h */
250 VideoMode_40x25_text, /* Mode 01h */
251 VideoMode_80x25_text, /* Mode 02h */
252 VideoMode_80x25_text, /* Mode 03h */
253 VideoMode_320x200_4color, /* Mode 04h */
254 VideoMode_320x200_4color, /* Mode 05h */
255 VideoMode_640x200_2color, /* Mode 06h */
256 NULL, /* Mode 07h */
257 NULL, /* Mode 08h */
258 NULL, /* Mode 09h */
259 NULL, /* Mode 0Ah */
260 NULL, /* Mode 0Bh */
261 NULL, /* Mode 0Ch */
262 VideoMode_320x200_16color, /* Mode 0Dh */
263 VideoMode_640x200_16color, /* Mode 0Eh */
264 NULL, /* Mode 0Fh */
265 VideoMode_640x350_16color, /* Mode 10h */
266 VideoMode_640x480_2color, /* Mode 11h */
267 VideoMode_640x480_16color, /* Mode 12h */
268 VideoMode_320x200_256color, /* Mode 13h */
269 };
270
271 /* PRIVATE FUNCTIONS **********************************************************/
272
273 static BOOLEAN BiosKbdBufferPush(WORD Data)
274 {
275 /* Get the location of the element after the tail */
276 WORD NextElement = Bda->KeybdBufferTail + sizeof(WORD);
277
278 /* Wrap it around if it's at or beyond the end */
279 if (NextElement >= Bda->KeybdBufferEnd) NextElement = Bda->KeybdBufferStart;
280
281 /* If it's full, fail */
282 if (NextElement == Bda->KeybdBufferHead) return FALSE;
283
284 /* Put the value in the queue */
285 *((LPWORD)((ULONG_PTR)Bda + Bda->KeybdBufferTail)) = Data;
286 Bda->KeybdBufferTail += sizeof(WORD);
287
288 /* Check if we are at, or have passed, the end of the buffer */
289 if (Bda->KeybdBufferTail >= Bda->KeybdBufferEnd)
290 {
291 /* Return it to the beginning */
292 Bda->KeybdBufferTail = Bda->KeybdBufferStart;
293 }
294
295 /* Return success */
296 return TRUE;
297 }
298
299 static BOOLEAN BiosKbdBufferTop(LPWORD Data)
300 {
301 /* If it's empty, fail */
302 if (Bda->KeybdBufferHead == Bda->KeybdBufferTail) return FALSE;
303
304 /* Otherwise, get the value and return success */
305 *Data = *((LPWORD)((ULONG_PTR)Bda + Bda->KeybdBufferHead));
306
307 return TRUE;
308 }
309
310 static BOOLEAN BiosKbdBufferPop(VOID)
311 {
312 /* If it's empty, fail */
313 if (Bda->KeybdBufferHead == Bda->KeybdBufferTail) return FALSE;
314
315 /* Remove the value from the queue */
316 Bda->KeybdBufferHead += sizeof(WORD);
317
318 /* Check if we are at, or have passed, the end of the buffer */
319 if (Bda->KeybdBufferHead >= Bda->KeybdBufferEnd)
320 {
321 /* Return it to the beginning */
322 Bda->KeybdBufferHead = Bda->KeybdBufferStart;
323 }
324
325 /* Return success */
326 return TRUE;
327 }
328
329 static VOID BiosReadWindow(LPWORD Buffer, SMALL_RECT Rectangle, BYTE Page)
330 {
331 INT i, j;
332 INT Counter = 0;
333 WORD Character;
334 DWORD VideoAddress = TO_LINEAR(TEXT_VIDEO_SEG, Page * Bda->VideoPageSize);
335
336 for (i = Rectangle.Top; i <= Rectangle.Bottom; i++)
337 {
338 for (j = Rectangle.Left; j <= Rectangle.Right; j++)
339 {
340 /* Read from video memory */
341 VgaReadMemory(VideoAddress + (i * Bda->ScreenColumns + j) * sizeof(WORD),
342 (LPVOID)&Character,
343 sizeof(WORD));
344
345 /* Write the data to the buffer in row order */
346 Buffer[Counter++] = Character;
347 }
348 }
349 }
350
351 static VOID BiosWriteWindow(LPWORD Buffer, SMALL_RECT Rectangle, BYTE Page)
352 {
353 INT i, j;
354 INT Counter = 0;
355 WORD Character;
356 DWORD VideoAddress = TO_LINEAR(TEXT_VIDEO_SEG, Page * Bda->VideoPageSize);
357
358 for (i = Rectangle.Top; i <= Rectangle.Bottom; i++)
359 {
360 for (j = Rectangle.Left; j <= Rectangle.Right; j++)
361 {
362 Character = Buffer[Counter++];
363
364 /* Write to video memory */
365 VgaWriteMemory(VideoAddress + (i * Bda->ScreenColumns + j) * sizeof(WORD),
366 (LPVOID)&Character,
367 sizeof(WORD));
368 }
369 }
370 }
371
372 /* PUBLIC FUNCTIONS ***********************************************************/
373
374 BYTE BiosGetVideoMode(VOID)
375 {
376 return Bda->VideoMode;
377 }
378
379 BOOLEAN BiosSetVideoMode(BYTE ModeNumber)
380 {
381 INT i;
382 COORD Resolution;
383 LPBYTE Values = VideoModes[ModeNumber];
384
385 DPRINT1("Switching to mode %Xh; Values = 0x%p\n", ModeNumber, Values);
386
387 if (Values == NULL) return FALSE;
388
389 /* Write the misc register */
390 VgaWritePort(VGA_MISC_WRITE, *(Values++));
391
392 /* Write the sequencer registers */
393 for (i = 0; i < VGA_SEQ_MAX_REG; i++)
394 {
395 VgaWritePort(VGA_SEQ_INDEX, i);
396 VgaWritePort(VGA_SEQ_DATA, *(Values++));
397 }
398
399 /* Write the GC registers */
400 for (i = 0; i < VGA_GC_MAX_REG; i++)
401 {
402 VgaWritePort(VGA_GC_INDEX, i);
403 VgaWritePort(VGA_GC_DATA, *(Values++));
404 }
405
406 /* Write the CRTC registers */
407 for (i = 0; i < VGA_CRTC_MAX_REG; i++)
408 {
409 VgaWritePort(VGA_CRTC_INDEX, i);
410 VgaWritePort(VGA_CRTC_DATA, *(Values++));
411 }
412
413 /* Write the AC registers */
414 for (i = 0; i < VGA_AC_MAX_REG; i++)
415 {
416 VgaWritePort(VGA_AC_INDEX, i);
417 VgaWritePort(VGA_AC_WRITE, *(Values++));
418 }
419
420 /* Reset the palette */
421 VgaResetPalette();
422
423 /* Update the values in the BDA */
424 Bda->VideoMode = ModeNumber;
425 Bda->VideoPage = 0;
426 Bda->VideoPageSize = BIOS_PAGE_SIZE;
427 Bda->VideoPageOffset = 0;
428
429 /* Get the character height */
430 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_MAX_SCAN_LINE_REG);
431 Bda->CharacterHeight = 1 + (VgaReadPort(VGA_CRTC_DATA) & 0x1F);
432
433 Resolution = VgaGetDisplayResolution();
434 Bda->ScreenColumns = Resolution.X;
435 Bda->ScreenRows = Resolution.Y - 1;
436
437 return TRUE;
438 }
439
440 BOOLEAN BiosSetVideoPage(BYTE PageNumber)
441 {
442 /* Check if the page exists */
443 if (PageNumber >= BIOS_MAX_PAGES) return FALSE;
444
445 /* Check if this is the same page */
446 if (PageNumber == Bda->VideoPage) return TRUE;
447
448 /* Set the values in the BDA */
449 Bda->VideoPage = PageNumber;
450 Bda->VideoPageSize = BIOS_PAGE_SIZE;
451 Bda->VideoPageOffset = PageNumber * BIOS_PAGE_SIZE;
452
453 /* Set the start address in the CRTC */
454 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_LOC_LOW_REG);
455 VgaWritePort(VGA_CRTC_DATA , LOBYTE(Bda->VideoPageOffset));
456 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_LOC_HIGH_REG);
457 VgaWritePort(VGA_CRTC_DATA , HIBYTE(Bda->VideoPageOffset));
458
459 return TRUE;
460 }
461
462 BOOLEAN BiosInitialize(VOID)
463 {
464 /* Initialize the BDA */
465 Bda = (PBIOS_DATA_AREA)SEG_OFF_TO_PTR(BDA_SEGMENT, 0);
466 Bda->EquipmentList = BIOS_EQUIPMENT_LIST;
467 /*
468 * Conventional memory size is 640 kB,
469 * see: http://webpages.charter.net/danrollins/techhelp/0184.HTM
470 * and see Ralf Brown: http://www.ctyme.com/intr/rb-0598.htm
471 * for more information.
472 */
473 Bda->MemorySize = 0x0280;
474 Bda->KeybdBufferStart = FIELD_OFFSET(BIOS_DATA_AREA, KeybdBuffer);
475 Bda->KeybdBufferEnd = Bda->KeybdBufferStart + BIOS_KBD_BUFFER_SIZE * sizeof(WORD);
476
477 /* Initialize the 32-bit Interrupt system */
478 InitializeInt32(BIOS_SEGMENT);
479
480 /* Register the BIOS 32-bit Interrupts */
481 RegisterInt32(BIOS_VIDEO_INTERRUPT , BiosVideoService );
482 RegisterInt32(BIOS_EQUIPMENT_INTERRUPT, BiosEquipmentService );
483 RegisterInt32(BIOS_MEMORY_SIZE , BiosGetMemorySize );
484 RegisterInt32(BIOS_KBD_INTERRUPT , BiosKeyboardService );
485 RegisterInt32(BIOS_TIME_INTERRUPT , BiosTimeService );
486 RegisterInt32(BIOS_SYS_TIMER_INTERRUPT, BiosSystemTimerInterrupt);
487
488 /* Get the input handle to the real console, and check for success */
489 BiosConsoleInput = CreateFileW(L"CONIN$",
490 GENERIC_READ | GENERIC_WRITE,
491 FILE_SHARE_READ | FILE_SHARE_WRITE,
492 NULL,
493 OPEN_EXISTING,
494 0,
495 NULL);
496 if (BiosConsoleInput == INVALID_HANDLE_VALUE)
497 {
498 return FALSE;
499 }
500
501 /* Get the output handle to the real console, and check for success */
502 BiosConsoleOutput = CreateFileW(L"CONOUT$",
503 GENERIC_READ | GENERIC_WRITE,
504 FILE_SHARE_READ | FILE_SHARE_WRITE,
505 NULL,
506 OPEN_EXISTING,
507 0,
508 NULL);
509 if (BiosConsoleOutput == INVALID_HANDLE_VALUE)
510 {
511 CloseHandle(BiosConsoleInput);
512 return FALSE;
513 }
514
515 /* Save the console screen buffer information */
516 if (!GetConsoleScreenBufferInfo(BiosConsoleOutput, &BiosSavedBufferInfo))
517 {
518 CloseHandle(BiosConsoleOutput);
519 CloseHandle(BiosConsoleInput);
520 return FALSE;
521 }
522
523 /* Initialize VGA */
524 if (!VgaInitialize(BiosConsoleOutput))
525 {
526 CloseHandle(BiosConsoleOutput);
527 CloseHandle(BiosConsoleInput);
528 return FALSE;
529 }
530
531 /* Update the cursor position */
532 BiosSetCursorPosition(BiosSavedBufferInfo.dwCursorPosition.Y,
533 BiosSavedBufferInfo.dwCursorPosition.X,
534 0);
535
536 /* Set the console input mode */
537 SetConsoleMode(BiosConsoleInput, ENABLE_MOUSE_INPUT | ENABLE_PROCESSED_INPUT);
538
539 /* Start the input thread */
540 InputThread = CreateThread(NULL, 0, &InputThreadProc, BiosConsoleInput, 0, NULL);
541
542 /* Initialize the PIC */
543 PicWriteCommand(PIC_MASTER_CMD, PIC_ICW1 | PIC_ICW1_ICW4);
544 PicWriteCommand(PIC_SLAVE_CMD , PIC_ICW1 | PIC_ICW1_ICW4);
545
546 /* Set the interrupt offsets */
547 PicWriteData(PIC_MASTER_DATA, BIOS_PIC_MASTER_INT);
548 PicWriteData(PIC_SLAVE_DATA , BIOS_PIC_SLAVE_INT);
549
550 /* Tell the master PIC there is a slave at IRQ 2 */
551 PicWriteData(PIC_MASTER_DATA, 1 << 2);
552 PicWriteData(PIC_SLAVE_DATA , 2);
553
554 /* Make sure the PIC is in 8086 mode */
555 PicWriteData(PIC_MASTER_DATA, PIC_ICW4_8086);
556 PicWriteData(PIC_SLAVE_DATA , PIC_ICW4_8086);
557
558 /* Clear the masks for both PICs */
559 PicWriteData(PIC_MASTER_DATA, 0x00);
560 PicWriteData(PIC_SLAVE_DATA , 0x00);
561
562 PitWriteCommand(0x34);
563 PitWriteData(0, 0x00);
564 PitWriteData(0, 0x00);
565
566 return TRUE;
567 }
568
569 VOID BiosCleanup(VOID)
570 {
571 /* Close the input thread handle */
572 if (InputThread != NULL) CloseHandle(InputThread);
573
574 /* Restore the old screen buffer */
575 SetConsoleActiveScreenBuffer(BiosConsoleOutput);
576
577 /* Restore the screen buffer size */
578 SetConsoleScreenBufferSize(BiosConsoleOutput, BiosSavedBufferInfo.dwSize);
579
580 /* Close the console handles */
581 if (BiosConsoleOutput != INVALID_HANDLE_VALUE) CloseHandle(BiosConsoleOutput);
582 if (BiosConsoleInput != INVALID_HANDLE_VALUE) CloseHandle(BiosConsoleInput);
583 }
584
585 WORD BiosPeekCharacter(VOID)
586 {
587 WORD CharacterData = 0;
588
589 /* Get the key from the queue, but don't remove it */
590 if (BiosKbdBufferTop(&CharacterData)) return CharacterData;
591 else return 0xFFFF;
592 }
593
594 WORD BiosGetCharacter(VOID)
595 {
596 WORD CharacterData = 0;
597
598 /* Check if there is a key available */
599 if (Bda->KeybdBufferHead != Bda->KeybdBufferTail)
600 {
601 /* Get the key from the queue, and remove it */
602 BiosKbdBufferTop(&CharacterData);
603 BiosKbdBufferPop();
604 }
605 else
606 {
607 /* Set the handler CF to repeat the BOP */
608 EmulatorSetFlag(EMULATOR_FLAG_CF);
609 }
610
611 return CharacterData;
612 }
613
614 VOID BiosGetCursorPosition(PBYTE Row, PBYTE Column, BYTE Page)
615 {
616 /* Make sure the selected video page is valid */
617 if (Page >= BIOS_MAX_PAGES) return;
618
619 /* Get the cursor location */
620 *Row = HIBYTE(Bda->CursorPosition[Page]);
621 *Column = LOBYTE(Bda->CursorPosition[Page]);
622 }
623
624 VOID BiosSetCursorPosition(BYTE Row, BYTE Column, BYTE Page)
625 {
626 /* Make sure the selected video page is valid */
627 if (Page >= BIOS_MAX_PAGES) return;
628
629 /* Update the position in the BDA */
630 Bda->CursorPosition[Page] = MAKEWORD(Column, Row);
631
632 /* Check if this is the current video page */
633 if (Page == Bda->VideoPage)
634 {
635 WORD Offset = Row * Bda->ScreenColumns + Column;
636
637 /* Modify the CRTC registers */
638 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_LOC_LOW_REG);
639 VgaWritePort(VGA_CRTC_DATA , LOBYTE(Offset));
640 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_LOC_HIGH_REG);
641 VgaWritePort(VGA_CRTC_DATA , HIBYTE(Offset));
642 }
643 }
644
645 BOOLEAN BiosScrollWindow(INT Direction,
646 DWORD Amount,
647 SMALL_RECT Rectangle,
648 BYTE Page,
649 BYTE FillAttribute)
650 {
651 DWORD i;
652 LPWORD WindowData;
653 DWORD WindowSize = (Rectangle.Bottom - Rectangle.Top + 1)
654 * (Rectangle.Right - Rectangle.Left + 1);
655
656 /* Allocate a buffer for the window */
657 WindowData = (LPWORD)HeapAlloc(GetProcessHeap(),
658 HEAP_ZERO_MEMORY,
659 WindowSize * sizeof(WORD));
660 if (WindowData == NULL) return FALSE;
661
662 /* Read the window data */
663 BiosReadWindow(WindowData, Rectangle, Page);
664
665 if (Amount == 0)
666 {
667 /* Fill the window */
668 for (i = 0; i < WindowSize; i++)
669 {
670 WindowData[i] = MAKEWORD(' ', FillAttribute);
671 }
672
673 goto Done;
674 }
675
676 // TODO: Scroll the window!
677
678 Done:
679 /* Write back the window data */
680 BiosWriteWindow(WindowData, Rectangle, Page);
681
682 /* Free the window buffer */
683 HeapFree(GetProcessHeap(), 0, WindowData);
684
685 return TRUE;
686 }
687
688 VOID BiosPrintCharacter(CHAR Character, BYTE Attribute, BYTE Page)
689 {
690 WORD CharData = MAKEWORD(Character, Attribute);
691 BYTE Row, Column;
692
693 /* Make sure the page exists */
694 if (Page >= BIOS_MAX_PAGES) return;
695
696 /* Get the cursor location */
697 BiosGetCursorPosition(&Row, &Column, Page);
698
699 if (Character == '\a')
700 {
701 /* Bell control character */
702 // NOTE: We may use what the terminal emulator offers to us...
703 Beep(800, 200);
704 return;
705 }
706 else if (Character == '\b')
707 {
708 /* Backspace control character */
709 if (Column > 0)
710 {
711 Column--;
712 }
713 else if (Row > 0)
714 {
715 Column = Bda->ScreenColumns - 1;
716 Row--;
717 }
718
719 /* Erase the existing character */
720 CharData = MAKEWORD(' ', Attribute);
721 EmulatorWriteMemory(&EmulatorContext,
722 TO_LINEAR(TEXT_VIDEO_SEG,
723 Page * Bda->VideoPageSize +
724 (Row * Bda->ScreenColumns + Column) * sizeof(WORD)),
725 (LPVOID)&CharData,
726 sizeof(WORD));
727 }
728 else if (Character == '\t')
729 {
730 /* Horizontal Tabulation control character */
731 do
732 {
733 // Taken from DosBox
734 BiosPrintCharacter(' ', Attribute, Page);
735 BiosGetCursorPosition(&Row, &Column, Page);
736 } while (Column % 8);
737 }
738 else if (Character == '\n')
739 {
740 /* Line Feed control character */
741 Row++;
742 }
743 else if (Character == '\r')
744 {
745 /* Carriage Return control character */
746 Column = 0;
747 }
748 else
749 {
750 /* Default character */
751
752 /* Write the character */
753 EmulatorWriteMemory(&EmulatorContext,
754 TO_LINEAR(TEXT_VIDEO_SEG,
755 Page * Bda->VideoPageSize +
756 (Row * Bda->ScreenColumns + Column) * sizeof(WORD)),
757 (LPVOID)&CharData,
758 sizeof(WORD));
759
760 /* Advance the cursor */
761 Column++;
762 }
763
764 /* Check if it passed the end of the row */
765 if (Column >= Bda->ScreenColumns)
766 {
767 /* Return to the first column and go to the next line */
768 Column = 0;
769 Row++;
770 }
771
772 /* Scroll the screen up if needed */
773 if (Row > Bda->ScreenRows)
774 {
775 /* The screen must be scrolled up */
776 SMALL_RECT Rectangle = { 0, 0, Bda->ScreenColumns - 1, Bda->ScreenRows };
777
778 BiosScrollWindow(SCROLL_DIRECTION_UP,
779 1,
780 Rectangle,
781 Page,
782 DEFAULT_ATTRIBUTE);
783
784 Row--;
785 }
786
787 /* Set the cursor position */
788 BiosSetCursorPosition(Row, Column, Page);
789 }
790
791 VOID WINAPI BiosVideoService(LPWORD Stack)
792 {
793 switch (getAH())
794 {
795 /* Set Video Mode */
796 case 0x00:
797 {
798 BiosSetVideoMode(getAL());
799 VgaClearMemory();
800 break;
801 }
802
803 /* Set Text-Mode Cursor Shape */
804 case 0x01:
805 {
806 /* Update the BDA */
807 Bda->CursorStartLine = getCH();
808 Bda->CursorEndLine = getCL();
809
810 /* Modify the CRTC registers */
811 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_START_REG);
812 VgaWritePort(VGA_CRTC_DATA , Bda->CursorStartLine);
813 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_END_REG);
814 VgaWritePort(VGA_CRTC_DATA , Bda->CursorEndLine);
815
816 break;
817 }
818
819 /* Set Cursor Position */
820 case 0x02:
821 {
822 BiosSetCursorPosition(getDH(), getDL(), getBH());
823 break;
824 }
825
826 /* Get Cursor Position */
827 case 0x03:
828 {
829 /* Make sure the selected video page exists */
830 if (getBH() >= BIOS_MAX_PAGES) break;
831
832 /* Return the result */
833 setAX(0);
834 setCX(MAKEWORD(Bda->CursorEndLine, Bda->CursorStartLine));
835 setDX(Bda->CursorPosition[getBH()]);
836 break;
837 }
838
839 /* Query Light Pen */
840 case 0x04:
841 {
842 /*
843 * On modern BIOSes, this function returns 0
844 * so that we can ignore the other registers.
845 */
846 setAX(0);
847 break;
848 }
849
850 /* Select Active Display Page */
851 case 0x05:
852 {
853 BiosSetVideoPage(getAL());
854 break;
855 }
856
857 /* Scroll Window Up/Down */
858 case 0x06:
859 case 0x07:
860 {
861 SMALL_RECT Rectangle = { getCL(), getCH(), getDL(), getDH() };
862
863 /* Call the internal function */
864 BiosScrollWindow((getAH() == 0x06) ? SCROLL_DIRECTION_UP
865 : SCROLL_DIRECTION_DOWN,
866 getAL(),
867 Rectangle,
868 Bda->VideoPage,
869 getBH());
870
871 break;
872 }
873
874 /* Read/Write Character From Cursor Position */
875 case 0x08:
876 case 0x09:
877 case 0x0A:
878 {
879 WORD CharacterData = MAKEWORD(getAL(), getBL());
880 BYTE Page = getBH();
881 DWORD Offset;
882
883 /* Check if the page exists */
884 if (Page >= BIOS_MAX_PAGES) break;
885
886 /* Find the offset of the character */
887 Offset = Page * Bda->VideoPageSize +
888 (HIBYTE(Bda->CursorPosition[Page]) * Bda->ScreenColumns +
889 LOBYTE(Bda->CursorPosition[Page])) * 2;
890
891 if (getAH() == 0x08)
892 {
893 /* Read from the video memory */
894 VgaReadMemory(TO_LINEAR(TEXT_VIDEO_SEG, Offset),
895 (LPVOID)&CharacterData,
896 sizeof(WORD));
897
898 /* Return the character in AX */
899 setAX(CharacterData);
900 }
901 else
902 {
903 /* Write to video memory */
904 VgaWriteMemory(TO_LINEAR(TEXT_VIDEO_SEG, Offset),
905 (LPVOID)&CharacterData,
906 (getBH() == 0x09) ? sizeof(WORD) : sizeof(BYTE));
907 }
908
909 break;
910 }
911
912 /* Teletype Output */
913 case 0x0E:
914 {
915 BiosPrintCharacter(getAL(), getBL(), getBH());
916 break;
917 }
918
919 /* Get Current Video Mode */
920 case 0x0F:
921 {
922 setAX(MAKEWORD(Bda->VideoMode, Bda->ScreenColumns));
923 setBX(MAKEWORD(getBL(), Bda->VideoPage));
924 break;
925 }
926
927 /* Palette Control */
928 case 0x10:
929 {
930 switch (getAL())
931 {
932 /* Set Single Palette Register */
933 case 0x00:
934 {
935 /* Reset the flip-flop */
936 VgaReadPort(VGA_STAT_COLOR);
937
938 /* Write the index */
939 VgaWritePort(VGA_AC_INDEX, getBL());
940
941 /* Write the data */
942 VgaWritePort(VGA_AC_WRITE, getBH());
943
944 break;
945 }
946
947 /* Set Overscan Color */
948 case 0x01:
949 {
950 /* Reset the flip-flop */
951 VgaReadPort(VGA_STAT_COLOR);
952
953 /* Write the index */
954 VgaWritePort(VGA_AC_INDEX, VGA_AC_OVERSCAN_REG);
955
956 /* Write the data */
957 VgaWritePort(VGA_AC_WRITE, getBH());
958
959 break;
960 }
961
962 /* Set All Palette Registers */
963 case 0x02:
964 {
965 INT i;
966 LPBYTE Buffer = SEG_OFF_TO_PTR(getES(), getDX());
967
968 /* Set the palette registers */
969 for (i = 0; i <= VGA_AC_PAL_F_REG; i++)
970 {
971 /* Reset the flip-flop */
972 VgaReadPort(VGA_STAT_COLOR);
973
974 /* Write the index */
975 VgaWritePort(VGA_AC_INDEX, i);
976
977 /* Write the data */
978 VgaWritePort(VGA_AC_WRITE, Buffer[i]);
979 }
980
981 /* Set the overscan register */
982 VgaWritePort(VGA_AC_INDEX, VGA_AC_OVERSCAN_REG);
983 VgaWritePort(VGA_AC_WRITE, Buffer[VGA_AC_PAL_F_REG + 1]);
984
985 break;
986 }
987
988 /* Get Single Palette Register */
989 case 0x07:
990 {
991 /* Reset the flip-flop */
992 VgaReadPort(VGA_STAT_COLOR);
993
994 /* Write the index */
995 VgaWritePort(VGA_AC_INDEX, getBL());
996
997 /* Read the data */
998 setBH(VgaReadPort(VGA_AC_READ));
999
1000 break;
1001 }
1002
1003 /* Get Overscan Color */
1004 case 0x08:
1005 {
1006 /* Reset the flip-flop */
1007 VgaReadPort(VGA_STAT_COLOR);
1008
1009 /* Write the index */
1010 VgaWritePort(VGA_AC_INDEX, VGA_AC_OVERSCAN_REG);
1011
1012 /* Read the data */
1013 setBH(VgaReadPort(VGA_AC_READ));
1014
1015 break;
1016 }
1017
1018 /* Get All Palette Registers */
1019 case 0x09:
1020 {
1021 INT i;
1022 LPBYTE Buffer = SEG_OFF_TO_PTR(getES(), getDX());
1023
1024 /* Get the palette registers */
1025 for (i = 0; i <= VGA_AC_PAL_F_REG; i++)
1026 {
1027 /* Reset the flip-flop */
1028 VgaReadPort(VGA_STAT_COLOR);
1029
1030 /* Write the index */
1031 VgaWritePort(VGA_AC_INDEX, i);
1032
1033 /* Read the data */
1034 Buffer[i] = VgaReadPort(VGA_AC_READ);
1035 }
1036
1037 /* Get the overscan register */
1038 VgaWritePort(VGA_AC_INDEX, VGA_AC_OVERSCAN_REG);
1039 Buffer[VGA_AC_PAL_F_REG + 1] = VgaReadPort(VGA_AC_READ);
1040
1041 break;
1042 }
1043
1044 /* Set Individual DAC Register */
1045 case 0x10:
1046 {
1047 /* Write the index */
1048 // Certainly in BL and not in BX as said by Ralf Brown...
1049 VgaWritePort(VGA_DAC_WRITE_INDEX, getBL());
1050
1051 /* Write the data in this order: Red, Green, Blue */
1052 VgaWritePort(VGA_DAC_DATA, getDH());
1053 VgaWritePort(VGA_DAC_DATA, getCH());
1054 VgaWritePort(VGA_DAC_DATA, getCL());
1055
1056 break;
1057 }
1058
1059 /* Set Block of DAC Registers */
1060 case 0x12:
1061 {
1062 INT i;
1063 LPBYTE Buffer = SEG_OFF_TO_PTR(getES(), getDX());
1064
1065 /* Write the index */
1066 // Certainly in BL and not in BX as said by Ralf Brown...
1067 VgaWritePort(VGA_DAC_WRITE_INDEX, getBL());
1068
1069 for (i = 0; i < getCX(); i++)
1070 {
1071 /* Write the data in this order: Red, Green, Blue */
1072 VgaWritePort(VGA_DAC_DATA, *Buffer++);
1073 VgaWritePort(VGA_DAC_DATA, *Buffer++);
1074 VgaWritePort(VGA_DAC_DATA, *Buffer++);
1075 }
1076
1077 break;
1078 }
1079
1080 /* Get Individual DAC Register */
1081 case 0x15:
1082 {
1083 /* Write the index */
1084 VgaWritePort(VGA_DAC_READ_INDEX, getBL());
1085
1086 /* Read the data in this order: Red, Green, Blue */
1087 setDH(VgaReadPort(VGA_DAC_DATA));
1088 setCH(VgaReadPort(VGA_DAC_DATA));
1089 setCL(VgaReadPort(VGA_DAC_DATA));
1090
1091 break;
1092 }
1093
1094 /* Get Block of DAC Registers */
1095 case 0x17:
1096 {
1097 INT i;
1098 LPBYTE Buffer = SEG_OFF_TO_PTR(getES(), getDX());
1099
1100 /* Write the index */
1101 // Certainly in BL and not in BX as said by Ralf Brown...
1102 VgaWritePort(VGA_DAC_READ_INDEX, getBL());
1103
1104 for (i = 0; i < getCX(); i++)
1105 {
1106 /* Write the data in this order: Red, Green, Blue */
1107 *Buffer++ = VgaReadPort(VGA_DAC_DATA);
1108 *Buffer++ = VgaReadPort(VGA_DAC_DATA);
1109 *Buffer++ = VgaReadPort(VGA_DAC_DATA);
1110 }
1111
1112 break;
1113 }
1114
1115 default:
1116 {
1117 DPRINT1("BIOS Palette Control Sub-command AL = 0x%02X NOT IMPLEMENTED\n",
1118 getAL());
1119 break;
1120 }
1121 }
1122
1123 break;
1124 }
1125
1126 /* Scroll Window */
1127 case 0x12:
1128 {
1129 SMALL_RECT Rectangle = { getCL(), getCH(), getDL(), getDH() };
1130
1131 /* Call the internal function */
1132 BiosScrollWindow(getBL(),
1133 getAL(),
1134 Rectangle,
1135 Bda->VideoPage,
1136 DEFAULT_ATTRIBUTE);
1137
1138 break;
1139 }
1140
1141 /* Display combination code */
1142 case 0x1A:
1143 {
1144 switch(getAL())
1145 {
1146 case 0x00: /* Get Display combiantion code */
1147 setAX(MAKEWORD(0x1A, 0x1A));
1148 setBX(MAKEWORD(0x08, 0x00)); /* VGA w/ color analog display */
1149 break;
1150 case 0x01: /* Set Display combination code */
1151 DPRINT1("Set Display combination code - Unsupported\n");
1152 break;
1153 default:
1154 break;
1155 }
1156 break;
1157 }
1158
1159 default:
1160 {
1161 DPRINT1("BIOS Function INT 10h, AH = 0x%02X NOT IMPLEMENTED\n",
1162 getAH());
1163 }
1164 }
1165 }
1166
1167 VOID WINAPI BiosEquipmentService(LPWORD Stack)
1168 {
1169 /* Return the equipment list */
1170 setAX(Bda->EquipmentList);
1171 }
1172
1173 VOID WINAPI BiosGetMemorySize(LPWORD Stack)
1174 {
1175 /* Return the conventional memory size in kB, typically 640 kB */
1176 setAX(Bda->MemorySize);
1177 }
1178
1179 VOID WINAPI BiosKeyboardService(LPWORD Stack)
1180 {
1181 switch (getAH())
1182 {
1183 /* Wait for keystroke and read */
1184 case 0x00:
1185 /* Wait for extended keystroke and read */
1186 case 0x10: // FIXME: Temporarily do the same as INT 16h, 00h
1187 {
1188 /* Read the character (and wait if necessary) */
1189 setAX(BiosGetCharacter());
1190 break;
1191 }
1192
1193 /* Get keystroke status */
1194 case 0x01:
1195 /* Get extended keystroke status */
1196 case 0x11: // FIXME: Temporarily do the same as INT 16h, 01h
1197 {
1198 WORD Data = BiosPeekCharacter();
1199
1200 if (Data != 0xFFFF)
1201 {
1202 /* There is a character, clear ZF and return it */
1203 Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_ZF;
1204 setAX(Data);
1205 }
1206 else
1207 {
1208 /* No character, set ZF */
1209 Stack[STACK_FLAGS] |= EMULATOR_FLAG_ZF;
1210 }
1211
1212 break;
1213 }
1214
1215 /* Get shift status */
1216 case 0x02:
1217 {
1218 /* Return the lower byte of the keyboard shift status word */
1219 setAL(LOBYTE(Bda->KeybdShiftFlags));
1220 break;
1221 }
1222
1223 /* Reserved */
1224 case 0x04:
1225 {
1226 DPRINT1("BIOS Function INT 16h, AH = 0x04 is RESERVED\n");
1227 break;
1228 }
1229
1230 /* Push keystroke */
1231 case 0x05:
1232 {
1233 /* Return 0 if success, 1 if failure */
1234 setAL(BiosKbdBufferPush(getCX()) == FALSE);
1235 break;
1236 }
1237
1238 /* Get extended shift status */
1239 case 0x12:
1240 {
1241 /*
1242 * Be careful! The returned word is similar to Bda->KeybdShiftFlags
1243 * but the high byte is organized differently:
1244 * the bytes 2 and 3 of the high byte are not the same...
1245 */
1246 WORD KeybdShiftFlags = (Bda->KeybdShiftFlags & 0xF3FF);
1247
1248 /* Return the extended keyboard shift status word */
1249 setAX(KeybdShiftFlags);
1250 break;
1251 }
1252
1253 default:
1254 {
1255 DPRINT1("BIOS Function INT 16h, AH = 0x%02X NOT IMPLEMENTED\n",
1256 getAH());
1257 }
1258 }
1259 }
1260
1261 VOID WINAPI BiosTimeService(LPWORD Stack)
1262 {
1263 switch (getAH())
1264 {
1265 case 0x00:
1266 {
1267 /* Set AL to 1 if midnight had passed, 0 otherwise */
1268 setAL(Bda->MidnightPassed ? 0x01 : 0x00);
1269
1270 /* Return the tick count in CX:DX */
1271 setCX(HIWORD(Bda->TickCounter));
1272 setDX(LOWORD(Bda->TickCounter));
1273
1274 /* Reset the midnight flag */
1275 Bda->MidnightPassed = FALSE;
1276
1277 break;
1278 }
1279
1280 case 0x01:
1281 {
1282 /* Set the tick count to CX:DX */
1283 Bda->TickCounter = MAKELONG(getDX(), getCX());
1284
1285 /* Reset the midnight flag */
1286 Bda->MidnightPassed = FALSE;
1287
1288 break;
1289 }
1290
1291 default:
1292 {
1293 DPRINT1("BIOS Function INT 1Ah, AH = 0x%02X NOT IMPLEMENTED\n",
1294 getAH());
1295 }
1296 }
1297 }
1298
1299 VOID WINAPI BiosSystemTimerInterrupt(LPWORD Stack)
1300 {
1301 /* Increase the system tick count */
1302 Bda->TickCounter++;
1303 }
1304
1305 VOID BiosHandleIrq(BYTE IrqNumber, LPWORD Stack)
1306 {
1307 switch (IrqNumber)
1308 {
1309 /* PIT IRQ */
1310 case 0:
1311 {
1312 /* Perform the system timer interrupt */
1313 EmulatorInterrupt(BIOS_SYS_TIMER_INTERRUPT);
1314 break;
1315 }
1316
1317 /* Keyboard IRQ */
1318 case 1:
1319 {
1320 BYTE ScanCode, VirtualKey;
1321 WORD Character;
1322
1323 /* Loop while there is a scancode available */
1324 do
1325 {
1326 /* Get the scan code and virtual key code */
1327 ScanCode = KeyboardReadData();
1328 VirtualKey = MapVirtualKey(ScanCode & 0x7F, MAPVK_VSC_TO_VK);
1329
1330 /* Check if this is a key press or release */
1331 if (!(ScanCode & (1 << 7)))
1332 {
1333 /* Key press */
1334 if (VirtualKey == VK_NUMLOCK ||
1335 VirtualKey == VK_CAPITAL ||
1336 VirtualKey == VK_SCROLL ||
1337 VirtualKey == VK_INSERT)
1338 {
1339 /* For toggle keys, toggle the lowest bit in the keyboard map */
1340 BiosKeyboardMap[VirtualKey] ^= ~(1 << 0);
1341 }
1342
1343 /* Set the highest bit */
1344 BiosKeyboardMap[VirtualKey] |= (1 << 7);
1345
1346 /* Find out which character this is */
1347 Character = 0;
1348 if (ToAscii(VirtualKey, ScanCode, BiosKeyboardMap, &Character, 0) == 0)
1349 {
1350 /* Not ASCII */
1351 Character = 0;
1352 }
1353
1354 /* Push it onto the BIOS keyboard queue */
1355 BiosKbdBufferPush(MAKEWORD(Character, ScanCode));
1356 }
1357 else
1358 {
1359 /* Key release, unset the highest bit */
1360 BiosKeyboardMap[VirtualKey] &= ~(1 << 7);
1361 }
1362 }
1363 while (KeyboardReadStatus() & 1);
1364
1365 /* Clear the keyboard flags */
1366 Bda->KeybdShiftFlags = 0;
1367
1368 /* Set the appropriate flags based on the state */
1369 if (BiosKeyboardMap[VK_RSHIFT] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_RSHIFT;
1370 if (BiosKeyboardMap[VK_LSHIFT] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_LSHIFT;
1371 if (BiosKeyboardMap[VK_CONTROL] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_CTRL;
1372 if (BiosKeyboardMap[VK_MENU] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_ALT;
1373 if (BiosKeyboardMap[VK_SCROLL] & (1 << 0)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_SCROLL_ON;
1374 if (BiosKeyboardMap[VK_NUMLOCK] & (1 << 0)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_NUMLOCK_ON;
1375 if (BiosKeyboardMap[VK_CAPITAL] & (1 << 0)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_CAPSLOCK_ON;
1376 if (BiosKeyboardMap[VK_INSERT] & (1 << 0)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_INSERT_ON;
1377 if (BiosKeyboardMap[VK_RMENU] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_RALT;
1378 if (BiosKeyboardMap[VK_LMENU] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_LALT;
1379 if (BiosKeyboardMap[VK_SNAPSHOT] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_SYSRQ;
1380 if (BiosKeyboardMap[VK_PAUSE] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_PAUSE;
1381 if (BiosKeyboardMap[VK_SCROLL] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_SCROLL;
1382 if (BiosKeyboardMap[VK_NUMLOCK] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_NUMLOCK;
1383 if (BiosKeyboardMap[VK_CAPITAL] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_CAPSLOCK;
1384 if (BiosKeyboardMap[VK_INSERT] & (1 << 7)) Bda->KeybdShiftFlags |= BDA_KBDFLAG_INSERT;
1385
1386 break;
1387 }
1388 }
1389
1390 /* Send End-of-Interrupt to the PIC */
1391 if (IrqNumber >= 8) PicWriteCommand(PIC_SLAVE_CMD, PIC_OCW2_EOI);
1392 PicWriteCommand(PIC_MASTER_CMD, PIC_OCW2_EOI);
1393 }
1394
1395 /* EOF */