[NTVDM]
[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 /* PRIVATE VARIABLES **********************************************************/
21
22 PBIOS_DATA_AREA Bda;
23 static BYTE BiosKeyboardMap[256];
24 static HANDLE BiosConsoleInput = INVALID_HANDLE_VALUE;
25 static HANDLE BiosConsoleOutput = INVALID_HANDLE_VALUE;
26 static CONSOLE_SCREEN_BUFFER_INFO BiosSavedBufferInfo;
27
28 /*
29 * VGA Register Configurations for BIOS Video Modes
30 * The configurations come from DosBox.
31 */
32 static BYTE VideoMode_40x25_text[] =
33 {
34 /* Miscellaneous Register */
35 0x67,
36
37 /* Sequencer Registers */
38 0x00, 0x08, 0x03, 0x00, 0x07,
39
40 /* GC Registers */
41 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x0E, 0x0F, 0xFF,
42
43 /* CRTC Registers */
44 0x2D, 0x27, 0x28, 0x90, 0x2B, 0xA0, 0xBF, 0x1F, 0x00, 0x4F, 0x0D, 0x0E,
45 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x14, 0x1F, 0x96, 0xB9, 0xA3,
46 0xFF,
47
48 /* AC Registers */
49 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07, 0x38, 0x39, 0x3A, 0x3B,
50 0x3C, 0x3D, 0x3E, 0x3F, 0x0C, 0x00, 0x0F, 0x08, 0x00
51 };
52
53 static BYTE VideoMode_80x25_text[] =
54 {
55 /* Miscellaneous Register */
56 0x67,
57
58 /* Sequencer Registers */
59 0x00, 0x00, 0x03, 0x00, 0x07,
60
61 /* GC Registers */
62 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x0E, 0x0F, 0xFF,
63
64 /* CRTC Registers */
65 0x5F, 0x4F, 0x50, 0x82, 0x55, 0x81, 0xBF, 0x1F, 0x00, 0x4F, 0x0D, 0x0E,
66 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x28, 0x1F, 0x96, 0xB9, 0xA3,
67 0xFF,
68
69 /* AC Registers */
70 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07, 0x38, 0x39, 0x3A, 0x3B,
71 0x3C, 0x3D, 0x3E, 0x3F, 0x0C, 0x00, 0x0F, 0x08, 0x00
72 };
73
74 static BYTE VideoMode_320x200_4color[] =
75 {
76 /* Miscellaneous Register */
77 0x63,
78
79 /* Sequencer Registers */
80 0x00, 0x09, 0x00, 0x00, 0x02,
81
82 /* GC Registers */
83 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x0F, 0x0F, 0xFF,
84
85 /* CRTC Registers */
86 0x2D, 0x27, 0x28, 0x90, 0x2B, 0x80, 0xBF, 0x1F, 0x00, 0xC1, 0x00, 0x00,
87 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x14, 0x00, 0x96, 0xB9, 0xA2,
88 0xFF,
89
90 /* AC Registers */
91 0x00, 0x13, 0x15, 0x17, 0x02, 0x04, 0x06, 0x07, 0x10, 0x11, 0x12, 0x13,
92 0x14, 0x15, 0x16, 0x17, 0x01, 0x00, 0x0F, 0x00, 0x00
93 };
94
95 static BYTE VideoMode_640x200_2color[] =
96 {
97 /* Miscellaneous Register */
98 0x63,
99
100 /* Sequencer Registers */
101 0x00, 0x09, 0x0F, 0x00, 0x02,
102
103 /* GC Registers */
104 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0xFF,
105
106 /* CRTC Registers */
107 0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0xBF, 0x1F, 0x00, 0xC1, 0x00, 0x00,
108 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x28, 0x00, 0x96, 0xB9, 0xC2,
109 0xFF,
110
111 /* AC Registers */
112 0x00, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17,
113 0x17, 0x17, 0x17, 0x17, 0x01, 0x00, 0x01, 0x00, 0x00
114 };
115
116 static BYTE VideoMode_320x200_16color[] =
117 {
118 /* Miscellaneous Register */
119 0x63,
120
121 /* Sequencer Registers */
122 0x00, 0x09, 0x0F, 0x00, 0x02,
123
124 /* GC Registers */
125 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x0F, 0xFF,
126
127 /* CRTC Registers */
128 0x2D, 0x27, 0x28, 0x90, 0x2B, 0x80, 0xBF, 0x1F, 0x00, 0xC0, 0x00, 0x00,
129 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x14, 0x00, 0x96, 0xB9, 0xE3,
130 0xFF,
131
132 /* AC Registers */
133 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x10, 0x11, 0x12, 0x13,
134 0x14, 0x15, 0x16, 0x17, 0x01, 0x00, 0x0F, 0x00, 0x00
135 };
136
137 static BYTE VideoMode_640x200_16color[] =
138 {
139 /* Miscellaneous Register */
140 0x63,
141
142 /* Sequencer Registers */
143 0x00, 0x01, 0x0F, 0x00, 0x02,
144
145 /* GC Registers */
146 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x0F, 0xFF,
147
148 /* CRTC Registers */
149 0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0xBF, 0x1F, 0x00, 0xC0, 0x00, 0x00,
150 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x28, 0x00, 0x96, 0xB9, 0xE3,
151 0xFF,
152
153 /* AC Registers */
154 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x10, 0x11, 0x12, 0x13,
155 0x14, 0x15, 0x16, 0x17, 0x01, 0x00, 0x0F, 0x00, 0x00
156 };
157
158 static BYTE VideoMode_640x350_16color[] =
159 {
160 /* Miscellaneous Register */
161 0xA3,
162
163 /* Sequencer Registers */
164 0x00, 0x01, 0x0F, 0x00, 0x02,
165
166 /* GC Registers */
167 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x0F, 0xFF,
168
169 /* CRTC Registers */
170 0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0xBF, 0x1F, 0x00, 0x40, 0x00, 0x00,
171 0x00, 0x00, 0x00, 0x00, 0x83, 0x85, 0x5D, 0x28, 0x0F, 0x63, 0xBA, 0xE3,
172 0xFF,
173
174 /* AC Registers */
175 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07, 0x38, 0x39, 0x3A, 0x3B,
176 0x3C, 0x3D, 0x3E, 0x3F, 0x01, 0x00, 0x0F, 0x00, 0x00
177 };
178
179 static BYTE VideoMode_640x480_2color[] =
180 {
181 /* Miscellaneous Register */
182 0xE3,
183
184 /* Sequencer Registers */
185 0x00, 0x01, 0x0F, 0x00, 0x02,
186
187 /* GC Registers */
188 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x0F, 0xFF,
189
190 /* CRTC Registers */
191 0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0x0B, 0x3E, 0x00, 0x40, 0x00, 0x00,
192 0x00, 0x00, 0x00, 0x00, 0xEA, 0x8C, 0xDF, 0x28, 0x00, 0xE7, 0x04, 0xC3,
193 0xFF,
194
195 /* AC Registers */
196 0x00, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
197 0x3F, 0x3F, 0x3F, 0x3F, 0x01, 0x00, 0x0F, 0x00, 0x00
198 };
199
200 static BYTE VideoMode_640x480_16color[] =
201 {
202 /* Miscellaneous Register */
203 0xE3,
204
205 /* Sequencer Registers */
206 0x00, 0x01, 0x0F, 0x00, 0x02,
207
208 /* GC Registers */
209 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x0F, 0xFF,
210
211 /* CRTC Registers */
212 0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0x0B, 0x3E, 0x00, 0x40, 0x00, 0x00,
213 0x00, 0x00, 0x00, 0x00, 0xEA, 0x8C, 0xDF, 0x28, 0x00, 0xE7, 0x04, 0xE3,
214 0xFF,
215
216 /* AC Registers */
217 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07, 0x38, 0x39, 0x3A, 0x3B,
218 0x3C, 0x3D, 0x3E, 0x3F, 0x01, 0x00, 0x0F, 0x00, 0x00
219 };
220
221 static BYTE VideoMode_320x200_256color[] =
222 {
223 /* Miscellaneous Register */
224 0x63,
225
226 /* Sequencer Registers */
227 0x00, 0x01, 0x0F, 0x00, 0x0E,
228
229 /* GC Registers */
230 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x05, 0x0F, 0xFF,
231
232 /* CRTC Registers */
233 0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0xBF, 0x1F, 0x00, 0x41, 0x00, 0x00,
234 0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x28, 0x40, 0x96, 0xB9, 0xA3,
235 0xFF,
236
237 /* AC Registers */
238 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
239 0x0C, 0x0D, 0x0E, 0x0F, 0x41, 0x00, 0x0F, 0x00, 0x00
240 };
241
242 static LPBYTE VideoModes[] =
243 {
244 VideoMode_40x25_text, /* Mode 00h */
245 VideoMode_40x25_text, /* Mode 01h */
246 VideoMode_80x25_text, /* Mode 02h */
247 VideoMode_80x25_text, /* Mode 03h */
248 VideoMode_320x200_4color, /* Mode 04h */
249 VideoMode_320x200_4color, /* Mode 05h */
250 VideoMode_640x200_2color, /* Mode 06h */
251 NULL, /* Mode 07h */
252 NULL, /* Mode 08h */
253 NULL, /* Mode 09h */
254 NULL, /* Mode 0Ah */
255 NULL, /* Mode 0Bh */
256 NULL, /* Mode 0Ch */
257 VideoMode_320x200_16color, /* Mode 0Dh */
258 VideoMode_640x200_16color, /* Mode 0Eh */
259 NULL, /* Mode 0Fh */
260 VideoMode_640x350_16color, /* Mode 10h */
261 VideoMode_640x480_2color, /* Mode 11h */
262 VideoMode_640x480_16color, /* Mode 12h */
263 VideoMode_320x200_256color, /* Mode 13h */
264 };
265
266 /* PRIVATE FUNCTIONS **********************************************************/
267
268 static BOOLEAN BiosKbdBufferPush(WORD Data)
269 {
270 /* Get the location of the element after the head */
271 WORD NextElement = Bda->KeybdBufferHead + 2;
272
273 /* Wrap it around if it's at or beyond the end */
274 if (NextElement >= Bda->KeybdBufferEnd) NextElement = Bda->KeybdBufferStart;
275
276 /* If it's full, fail */
277 if (NextElement == Bda->KeybdBufferTail) return FALSE;
278
279 /* Put the value in the queue */
280 *((LPWORD)((ULONG_PTR)Bda + Bda->KeybdBufferTail)) = Data;
281 Bda->KeybdBufferTail += sizeof(WORD);
282
283 /* Check if we are at, or have passed, the end of the buffer */
284 if (Bda->KeybdBufferTail >= Bda->KeybdBufferEnd)
285 {
286 /* Return it to the beginning */
287 Bda->KeybdBufferTail = Bda->KeybdBufferStart;
288 }
289
290 /* Return success */
291 return TRUE;
292 }
293
294 static BOOLEAN BiosKbdBufferTop(LPWORD Data)
295 {
296 /* If it's empty, fail */
297 if (Bda->KeybdBufferHead == Bda->KeybdBufferTail) return FALSE;
298
299 /* Otherwise, get the value and return success */
300 *Data = *((LPWORD)((ULONG_PTR)Bda + Bda->KeybdBufferHead));
301
302 return TRUE;
303 }
304
305 static BOOLEAN BiosKbdBufferPop(VOID)
306 {
307 /* If it's empty, fail */
308 if (Bda->KeybdBufferHead == Bda->KeybdBufferTail) return FALSE;
309
310 /* Remove the value from the queue */
311 Bda->KeybdBufferHead += sizeof(WORD);
312
313 /* Check if we are at, or have passed, the end of the buffer */
314 if (Bda->KeybdBufferHead >= Bda->KeybdBufferEnd)
315 {
316 /* Return it to the beginning */
317 Bda->KeybdBufferHead = Bda->KeybdBufferStart;
318 }
319
320 /* Return success */
321 return TRUE;
322 }
323
324 static VOID BiosReadWindow(LPWORD Buffer, SMALL_RECT Rectangle, BYTE Page)
325 {
326 INT i, j;
327 INT Counter = 0;
328 WORD Character;
329 DWORD VideoAddress = TO_LINEAR(TEXT_VIDEO_SEG, Page * Bda->VideoPageSize);
330
331 for (i = Rectangle.Top; i <= Rectangle.Bottom; i++)
332 {
333 for (j = Rectangle.Left; j <= Rectangle.Right; j++)
334 {
335 /* Read from video memory */
336 VgaReadMemory(VideoAddress + (i * Bda->ScreenColumns + j) * sizeof(WORD),
337 (LPVOID)&Character,
338 sizeof(WORD));
339
340 /* Write the data to the buffer in row order */
341 Buffer[Counter++] = Character;
342 }
343 }
344 }
345
346 static VOID BiosWriteWindow(LPWORD Buffer, SMALL_RECT Rectangle, BYTE Page)
347 {
348 INT i, j;
349 INT Counter = 0;
350 WORD Character;
351 DWORD VideoAddress = TO_LINEAR(TEXT_VIDEO_SEG, Page * Bda->VideoPageSize);
352
353 for (i = Rectangle.Top; i <= Rectangle.Bottom; i++)
354 {
355 for (j = Rectangle.Left; j <= Rectangle.Right; j++)
356 {
357 Character = Buffer[Counter++];
358
359 /* Write to video memory */
360 VgaWriteMemory(VideoAddress + (i * Bda->ScreenColumns + j) * sizeof(WORD),
361 (LPVOID)&Character,
362 sizeof(WORD));
363 }
364 }
365 }
366
367 /* PUBLIC FUNCTIONS ***********************************************************/
368
369 BYTE BiosGetVideoMode(VOID)
370 {
371 return Bda->VideoMode;
372 }
373
374 BOOLEAN BiosSetVideoMode(BYTE ModeNumber)
375 {
376 INT i;
377 COORD Resolution;
378 LPBYTE Values = VideoModes[ModeNumber];
379
380 if (Values == NULL) return FALSE;
381
382 /* Write the misc register */
383 VgaWritePort(VGA_MISC_WRITE, *(Values++));
384
385 /* Write the sequencer registers */
386 for (i = 0; i < VGA_SEQ_MAX_REG; i++)
387 {
388 VgaWritePort(VGA_SEQ_INDEX, i);
389 VgaWritePort(VGA_SEQ_DATA, *(Values++));
390 }
391
392 /* Write the GC registers */
393 for (i = 0; i < VGA_GC_MAX_REG; i++)
394 {
395 VgaWritePort(VGA_GC_INDEX, i);
396 VgaWritePort(VGA_GC_DATA, *(Values++));
397 }
398
399 /* Write the CRTC registers */
400 for (i = 0; i < VGA_CRTC_MAX_REG; i++)
401 {
402 VgaWritePort(VGA_CRTC_INDEX, i);
403 VgaWritePort(VGA_CRTC_DATA, *(Values++));
404 }
405
406 /* Write the AC registers */
407 for (i = 0; i < VGA_AC_MAX_REG; i++)
408 {
409 VgaWritePort(VGA_AC_INDEX, i);
410 VgaWritePort(VGA_AC_WRITE, *(Values++));
411 }
412
413 /* Update the values in the BDA */
414 Bda->VideoMode = ModeNumber;
415 Bda->VideoPage = 0;
416 Bda->VideoPageSize = BIOS_PAGE_SIZE;
417 Bda->VideoPageOffset = 0;
418
419 /* Get the character height */
420 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_MAX_SCAN_LINE_REG);
421 Bda->CharacterHeight = 1 + (VgaReadPort(VGA_CRTC_DATA) & 0x1F);
422
423 Resolution = VgaGetDisplayResolution();
424 Bda->ScreenColumns = Resolution.X;
425 Bda->ScreenRows = Resolution.Y - 1;
426
427 return TRUE;
428 }
429
430 BOOLEAN BiosSetVideoPage(BYTE PageNumber)
431 {
432 /* Check if the page exists */
433 if (PageNumber >= BIOS_MAX_PAGES) return FALSE;
434
435 /* Check if this is the same page */
436 if (PageNumber == Bda->VideoPage) return TRUE;
437
438 /* Set the values in the BDA */
439 Bda->VideoPage = PageNumber;
440 Bda->VideoPageSize = BIOS_PAGE_SIZE;
441 Bda->VideoPageOffset = PageNumber * BIOS_PAGE_SIZE;
442
443 /* Set the start address in the CRTC */
444 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_LOC_LOW_REG);
445 VgaWritePort(VGA_CRTC_DATA , LOBYTE(Bda->VideoPageOffset));
446 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_LOC_HIGH_REG);
447 VgaWritePort(VGA_CRTC_DATA , HIBYTE(Bda->VideoPageOffset));
448
449 return TRUE;
450 }
451
452 BOOLEAN BiosInitialize(VOID)
453 {
454 INT i;
455 WORD Offset = 0;
456 LPWORD IntVecTable = (LPWORD)((ULONG_PTR)BaseAddress);
457 LPBYTE BiosCode = (LPBYTE)((ULONG_PTR)BaseAddress + TO_LINEAR(BIOS_SEGMENT, 0));
458
459 /* Initialize the BDA */
460 Bda = (PBIOS_DATA_AREA)((ULONG_PTR)BaseAddress + TO_LINEAR(BDA_SEGMENT, 0));
461 Bda->EquipmentList = BIOS_EQUIPMENT_LIST;
462 Bda->KeybdBufferStart = FIELD_OFFSET(BIOS_DATA_AREA, KeybdBuffer);
463 Bda->KeybdBufferEnd = Bda->KeybdBufferStart + BIOS_KBD_BUFFER_SIZE * sizeof(WORD);
464
465 /* Generate ISR stubs and fill the IVT */
466 for (i = 0; i < 256; i++)
467 {
468 IntVecTable[i * 2] = Offset;
469 IntVecTable[i * 2 + 1] = BIOS_SEGMENT;
470
471 BiosCode[Offset++] = 0xFA; // cli
472
473 BiosCode[Offset++] = 0x6A; // push i
474 BiosCode[Offset++] = (BYTE)i;
475
476 BiosCode[Offset++] = LOBYTE(EMULATOR_BOP); // BOP sequence
477 BiosCode[Offset++] = HIBYTE(EMULATOR_BOP);
478 BiosCode[Offset++] = LOBYTE(EMULATOR_INT_BOP);
479 BiosCode[Offset++] = HIBYTE(EMULATOR_INT_BOP);
480
481 BiosCode[Offset++] = 0x44; // inc sp
482 BiosCode[Offset++] = 0x44; // inc sp
483
484 BiosCode[Offset++] = 0xCF; // iret
485 }
486
487 /* Get the input handle to the real console, and check for success */
488 BiosConsoleInput = CreateFileW(L"CONIN$",
489 GENERIC_READ | GENERIC_WRITE,
490 FILE_SHARE_READ | FILE_SHARE_WRITE,
491 NULL,
492 OPEN_EXISTING,
493 0,
494 NULL);
495 if (BiosConsoleInput == INVALID_HANDLE_VALUE)
496 {
497 return FALSE;
498 }
499
500 /* Get the output handle to the real console, and check for success */
501 BiosConsoleOutput = CreateFileW(L"CONOUT$",
502 GENERIC_READ | GENERIC_WRITE,
503 FILE_SHARE_READ | FILE_SHARE_WRITE,
504 NULL,
505 OPEN_EXISTING,
506 0,
507 NULL);
508 if (BiosConsoleOutput == INVALID_HANDLE_VALUE)
509 {
510 CloseHandle(BiosConsoleInput);
511 return FALSE;
512 }
513
514 /* Save the console screen buffer information */
515 if (!GetConsoleScreenBufferInfo(BiosConsoleOutput, &BiosSavedBufferInfo))
516 {
517 CloseHandle(BiosConsoleOutput);
518 CloseHandle(BiosConsoleInput);
519 return FALSE;
520 }
521
522 /* Initialize VGA */
523 if (!VgaInitialize(BiosConsoleOutput))
524 {
525 CloseHandle(BiosConsoleOutput);
526 CloseHandle(BiosConsoleInput);
527 return FALSE;
528 }
529
530 /* Update the cursor position */
531 BiosSetCursorPosition(BiosSavedBufferInfo.dwCursorPosition.Y,
532 BiosSavedBufferInfo.dwCursorPosition.X,
533 0);
534
535 /* Set the console input mode */
536 SetConsoleMode(BiosConsoleInput, ENABLE_MOUSE_INPUT | ENABLE_PROCESSED_INPUT);
537
538 /* Initialize the PIC */
539 PicWriteCommand(PIC_MASTER_CMD, PIC_ICW1 | PIC_ICW1_ICW4);
540 PicWriteCommand(PIC_SLAVE_CMD , PIC_ICW1 | PIC_ICW1_ICW4);
541
542 /* Set the interrupt offsets */
543 PicWriteData(PIC_MASTER_DATA, BIOS_PIC_MASTER_INT);
544 PicWriteData(PIC_SLAVE_DATA , BIOS_PIC_SLAVE_INT);
545
546 /* Tell the master PIC there is a slave at IRQ 2 */
547 PicWriteData(PIC_MASTER_DATA, 1 << 2);
548 PicWriteData(PIC_SLAVE_DATA , 2);
549
550 /* Make sure the PIC is in 8086 mode */
551 PicWriteData(PIC_MASTER_DATA, PIC_ICW4_8086);
552 PicWriteData(PIC_SLAVE_DATA , PIC_ICW4_8086);
553
554 /* Clear the masks for both PICs */
555 PicWriteData(PIC_MASTER_DATA, 0x00);
556 PicWriteData(PIC_SLAVE_DATA , 0x00);
557
558 PitWriteCommand(0x34);
559 PitWriteData(0, 0x00);
560 PitWriteData(0, 0x00);
561
562 return TRUE;
563 }
564
565 VOID BiosCleanup(VOID)
566 {
567 /* Restore the old screen buffer */
568 SetConsoleActiveScreenBuffer(BiosConsoleOutput);
569
570 /* Restore the screen buffer size */
571 SetConsoleScreenBufferSize(BiosConsoleOutput, BiosSavedBufferInfo.dwSize);
572
573 /* Close the console handles */
574 if (BiosConsoleOutput != INVALID_HANDLE_VALUE) CloseHandle(BiosConsoleOutput);
575 if (BiosConsoleInput != INVALID_HANDLE_VALUE) CloseHandle(BiosConsoleInput);
576 }
577
578 WORD BiosPeekCharacter(VOID)
579 {
580 WORD CharacterData;
581
582 /* Check if there is a key available */
583 if (Bda->KeybdBufferHead == Bda->KeybdBufferTail) return 0xFFFF;
584
585 /* Get the key from the queue, but don't remove it */
586 BiosKbdBufferTop(&CharacterData);
587
588 return CharacterData;
589 }
590
591 WORD BiosGetCharacter(VOID)
592 {
593 WORD CharacterData;
594 INPUT_RECORD InputRecord;
595 DWORD Count;
596
597 /* Check if there is a key available */
598 if (Bda->KeybdBufferHead != Bda->KeybdBufferTail)
599 {
600 /* Get the key from the queue, and remove it */
601 BiosKbdBufferTop(&CharacterData);
602 BiosKbdBufferPop();
603 }
604 else
605 {
606 VgaRefreshDisplay(); // HACK: Waiting here blocks the emulator!!!
607
608 while (TRUE)
609 {
610 /* Wait for a console event */
611 WaitForSingleObject(BiosConsoleInput, INFINITE);
612
613 /* Read the event, and make sure it's a keypress */
614 if (!ReadConsoleInput(BiosConsoleInput, &InputRecord, 1, &Count)) continue;
615 if (InputRecord.EventType != KEY_EVENT) continue;
616 if (!InputRecord.Event.KeyEvent.bKeyDown) continue;
617
618 /* Save the scan code and end the loop */
619 CharacterData = (InputRecord.Event.KeyEvent.wVirtualScanCode << 8)
620 | InputRecord.Event.KeyEvent.uChar.AsciiChar;
621
622 break;
623 }
624 }
625
626 return CharacterData;
627 }
628
629 VOID BiosSetCursorPosition(BYTE Row, BYTE Column, BYTE Page)
630 {
631 /* Make sure the selected video page is valid */
632 if (Page >= BIOS_MAX_PAGES) return;
633
634 /* Update the position in the BDA */
635 Bda->CursorPosition[Page] = (Row << 8) | Column;
636
637 /* Check if this is the current video page */
638 if (Page == Bda->VideoPage)
639 {
640 WORD Offset = Row * Bda->ScreenColumns + Column;
641
642 /* Modify the CRTC registers */
643 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_LOC_LOW_REG);
644 VgaWritePort(VGA_CRTC_DATA , LOBYTE(Offset));
645 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_LOC_HIGH_REG);
646 VgaWritePort(VGA_CRTC_DATA , HIBYTE(Offset));
647 }
648 }
649
650 BOOLEAN BiosScrollWindow(INT Direction,
651 DWORD Amount,
652 SMALL_RECT Rectangle,
653 BYTE Page,
654 BYTE FillAttribute)
655 {
656 DWORD i;
657 LPWORD WindowData;
658 DWORD WindowSize = (Rectangle.Bottom - Rectangle.Top + 1)
659 * (Rectangle.Right - Rectangle.Left + 1);
660
661 /* Allocate a buffer for the window */
662 WindowData = (LPWORD)HeapAlloc(GetProcessHeap(),
663 HEAP_ZERO_MEMORY,
664 WindowSize * sizeof(WORD));
665 if (WindowData == NULL) return FALSE;
666
667 /* Read the window data */
668 BiosReadWindow(WindowData, Rectangle, Page);
669
670 if (Amount == 0)
671 {
672 /* Fill the window */
673 for (i = 0; i < WindowSize; i++)
674 {
675 WindowData[i] = ' ' | (FillAttribute << 8);
676 }
677
678 goto Done;
679 }
680
681 // TODO: Scroll the window!
682
683 Done:
684 /* Write back the window data */
685 BiosWriteWindow(WindowData, Rectangle, Page);
686
687 /* Free the window buffer */
688 HeapFree(GetProcessHeap(), 0, WindowData);
689
690 return TRUE;
691 }
692
693 VOID BiosPrintCharacter(CHAR Character, BYTE Attribute, BYTE Page)
694 {
695 WORD CharData = (Attribute << 8) | Character;
696 BYTE Row, Column;
697
698 /* Make sure the page exists */
699 if (Page >= BIOS_MAX_PAGES) return;
700
701 /* Get the cursor location */
702 Row = HIBYTE(Bda->CursorPosition[Page]);
703 Column = LOBYTE(Bda->CursorPosition[Page]);
704
705 if (Character == '\a')
706 {
707 /* Bell control character */
708 // NOTE: We may use what the terminal emulator offers to us...
709 Beep(800, 200);
710 return;
711 }
712 else if (Character == '\b')
713 {
714 /* Backspace control character */
715 if (Column > 0)
716 {
717 Column--;
718 }
719 else if (Row > 0)
720 {
721 Column = Bda->ScreenColumns - 1;
722 Row--;
723 }
724
725 /* Erase the existing character */
726 CharData = (Attribute << 8) | ' ';
727 VgaWriteMemory(TO_LINEAR(TEXT_VIDEO_SEG,
728 Page * Bda->VideoPageSize
729 + (Row * Bda->ScreenColumns + Column) * sizeof(WORD)),
730 (LPVOID)&CharData,
731 sizeof(WORD));
732 }
733 else if (Character == '\n')
734 {
735 /* Line Feed control character */
736 Row++;
737 }
738 else if (Character == '\r')
739 {
740 /* Carriage Return control character */
741 Column = 0;
742 }
743 else
744 {
745 /* Default character */
746
747 /* Write the character */
748 VgaWriteMemory(TO_LINEAR(TEXT_VIDEO_SEG,
749 Page * Bda->VideoPageSize
750 + (Row * Bda->ScreenColumns + Column) * sizeof(WORD)),
751 (LPVOID)&CharData,
752 sizeof(WORD));
753
754 /* Advance the cursor */
755 Column++;
756 }
757
758 /* Check if it passed the end of the row */
759 if (Column >= Bda->ScreenColumns)
760 {
761 /* Return to the first column and go to the next line */
762 Column = 0;
763 Row++;
764 }
765
766 /* Scroll the screen up if needed */
767 if (Row > Bda->ScreenRows)
768 {
769 /* The screen must be scrolled up */
770 SMALL_RECT Rectangle = { 0, 0, Bda->ScreenColumns - 1, Bda->ScreenRows };
771
772 BiosScrollWindow(SCROLL_DIRECTION_UP,
773 1,
774 Rectangle,
775 Page,
776 DEFAULT_ATTRIBUTE);
777 }
778
779 /* Set the cursor position */
780 BiosSetCursorPosition(Row, Column, Page);
781 }
782
783 VOID BiosVideoService(LPWORD Stack)
784 {
785 DWORD Eax = EmulatorGetRegister(EMULATOR_REG_AX);
786 DWORD Ecx = EmulatorGetRegister(EMULATOR_REG_CX);
787 DWORD Edx = EmulatorGetRegister(EMULATOR_REG_DX);
788 DWORD Ebx = EmulatorGetRegister(EMULATOR_REG_BX);
789
790 switch (HIBYTE(Eax))
791 {
792 /* Set Video Mode */
793 case 0x00:
794 {
795 BiosSetVideoMode(LOBYTE(Eax));
796 VgaClearMemory();
797 break;
798 }
799
800 /* Set Text-Mode Cursor Shape */
801 case 0x01:
802 {
803 /* Update the BDA */
804 Bda->CursorStartLine = HIBYTE(Ecx);
805 Bda->CursorEndLine = LOBYTE(Ecx);
806
807 /* Modify the CRTC registers */
808 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_START_REG);
809 VgaWritePort(VGA_CRTC_DATA , Bda->CursorStartLine);
810 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_END_REG);
811 VgaWritePort(VGA_CRTC_DATA , Bda->CursorEndLine);
812
813 break;
814 }
815
816 /* Set Cursor Position */
817 case 0x02:
818 {
819 BiosSetCursorPosition(HIBYTE(Edx), LOBYTE(Edx), HIBYTE(Ebx));
820 break;
821 }
822
823 /* Get Cursor Position */
824 case 0x03:
825 {
826 /* Make sure the selected video page exists */
827 if (HIBYTE(Ebx) >= BIOS_MAX_PAGES) break;
828
829 /* Return the result */
830 EmulatorSetRegister(EMULATOR_REG_AX, 0);
831 EmulatorSetRegister(EMULATOR_REG_CX,
832 (Bda->CursorStartLine << 8) | Bda->CursorEndLine);
833 EmulatorSetRegister(EMULATOR_REG_DX, Bda->CursorPosition[HIBYTE(Ebx)]);
834
835 break;
836 }
837
838 /* Query Light Pen */
839 case 0x04:
840 {
841 /*
842 * On modern BIOSes, this function returns 0
843 * so that we can ignore the other registers.
844 */
845 EmulatorSetRegister(EMULATOR_REG_AX, 0);
846 break;
847 }
848
849 /* Select Active Display Page */
850 case 0x05:
851 {
852 BiosSetVideoPage(LOBYTE(Eax));
853 break;
854 }
855
856 /* Scroll Window Up/Down */
857 case 0x06:
858 case 0x07:
859 {
860 SMALL_RECT Rectangle =
861 {
862 LOBYTE(Ecx),
863 HIBYTE(Ecx),
864 LOBYTE(Edx),
865 HIBYTE(Edx)
866 };
867
868 /* Call the internal function */
869 BiosScrollWindow((HIBYTE(Eax) == 0x06) ? SCROLL_DIRECTION_UP
870 : SCROLL_DIRECTION_DOWN,
871 LOBYTE(Eax),
872 Rectangle,
873 Bda->VideoPage,
874 HIBYTE(Ebx));
875
876 break;
877 }
878
879 /* Read/Write Character From Cursor Position */
880 case 0x08:
881 case 0x09:
882 case 0x0A:
883 {
884 WORD CharacterData = MAKEWORD(LOBYTE(Eax), LOBYTE(Ebx));
885 BYTE Page = HIBYTE(Ebx);
886 DWORD Offset;
887
888 /* Check if the page exists */
889 if (Page >= BIOS_MAX_PAGES) break;
890
891 /* Find the offset of the character */
892 Offset = Page * Bda->VideoPageSize
893 + (HIBYTE(Bda->CursorPosition[Page]) * Bda->ScreenColumns
894 + LOBYTE(Bda->CursorPosition[Page])) * 2;
895
896 if (HIBYTE(Eax) == 0x08)
897 {
898 /* Read from the video memory */
899 VgaReadMemory(TO_LINEAR(TEXT_VIDEO_SEG, Offset),
900 (LPVOID)&CharacterData,
901 sizeof(WORD));
902
903 /* Return the character in AX */
904 EmulatorSetRegister(EMULATOR_REG_AX, CharacterData);
905 }
906 else
907 {
908 /* Write to video memory */
909 VgaWriteMemory(TO_LINEAR(TEXT_VIDEO_SEG, Offset),
910 (LPVOID)&CharacterData,
911 (HIBYTE(Ebx) == 0x09) ? sizeof(WORD) : sizeof(BYTE));
912 }
913
914 break;
915 }
916
917 /* Teletype Output */
918 case 0x0E:
919 {
920 BiosPrintCharacter(LOBYTE(Eax), LOBYTE(Ebx), HIBYTE(Ebx));
921 break;
922 }
923
924 /* Get Current Video Mode */
925 case 0x0F:
926 {
927 EmulatorSetRegister(EMULATOR_REG_AX,
928 MAKEWORD(Bda->VideoMode, Bda->ScreenColumns));
929 EmulatorSetRegister(EMULATOR_REG_BX,
930 MAKEWORD(LOBYTE(Ebx), Bda->VideoPage));
931
932 break;
933 }
934
935 /* Scroll Window */
936 case 0x12:
937 {
938 SMALL_RECT Rectangle =
939 {
940 LOBYTE(Ecx),
941 HIBYTE(Ecx),
942 LOBYTE(Edx),
943 HIBYTE(Edx)
944 };
945
946 /* Call the internal function */
947 BiosScrollWindow(LOBYTE(Ebx),
948 LOBYTE(Eax),
949 Rectangle,
950 Bda->VideoPage,
951 DEFAULT_ATTRIBUTE);
952
953 break;
954 }
955
956 /* Display combination code */
957 case 0x1A:
958 {
959 switch(LOBYTE(Eax))
960 {
961 case 0x00: /* Get Display combiantion code */
962 EmulatorSetRegister(EMULATOR_REG_AX, MAKEWORD(0x1A, 0x1A));
963 EmulatorSetRegister(EMULATOR_REG_BX, MAKEWORD(0x08, 0x0)); /* VGA w/ color analog display */
964 break;
965 case 0x01: /* Set Display combination code */
966 DPRINT1("Set Display combination code - Unsupported\n");
967 break;
968 default:
969 break;
970 }
971 break;
972 }
973
974 default:
975 {
976 DPRINT1("BIOS Function INT 10h, AH = 0x%02X NOT IMPLEMENTED\n",
977 HIBYTE(Eax));
978 }
979 }
980 }
981
982 VOID BiosKeyboardService(LPWORD Stack)
983 {
984 DWORD Eax = EmulatorGetRegister(EMULATOR_REG_AX);
985
986 switch (HIBYTE(Eax))
987 {
988 case 0x00:
989 {
990 /* Read the character (and wait if necessary) */
991 EmulatorSetRegister(EMULATOR_REG_AX, BiosGetCharacter());
992
993 break;
994 }
995
996 case 0x01:
997 {
998 WORD Data = BiosPeekCharacter();
999
1000 if (Data != 0xFFFF)
1001 {
1002 /* There is a character, clear ZF and return it */
1003 EmulatorSetRegister(EMULATOR_REG_AX, Data);
1004 Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_ZF;
1005 }
1006 else
1007 {
1008 /* No character, set ZF */
1009 Stack[STACK_FLAGS] |= EMULATOR_FLAG_ZF;
1010 }
1011
1012 break;
1013 }
1014
1015 default:
1016 {
1017 DPRINT1("BIOS Function INT 16h, AH = 0x%02X NOT IMPLEMENTED\n",
1018 HIBYTE(Eax));
1019 }
1020 }
1021 }
1022
1023 VOID BiosTimeService(LPWORD Stack)
1024 {
1025 DWORD Eax = EmulatorGetRegister(EMULATOR_REG_AX);
1026 DWORD Ecx = EmulatorGetRegister(EMULATOR_REG_CX);
1027 DWORD Edx = EmulatorGetRegister(EMULATOR_REG_DX);
1028
1029 switch (HIBYTE(Eax))
1030 {
1031 case 0x00:
1032 {
1033 /* Set AL to 1 if midnight had passed, 0 otherwise */
1034 Eax &= 0xFFFFFF00;
1035 if (Bda->MidnightPassed) Eax |= 1;
1036
1037 /* Return the tick count in CX:DX */
1038 EmulatorSetRegister(EMULATOR_REG_AX, Eax);
1039 EmulatorSetRegister(EMULATOR_REG_CX, HIWORD(Bda->TickCounter));
1040 EmulatorSetRegister(EMULATOR_REG_DX, LOWORD(Bda->TickCounter));
1041
1042 /* Reset the midnight flag */
1043 Bda->MidnightPassed = FALSE;
1044
1045 break;
1046 }
1047
1048 case 0x01:
1049 {
1050 /* Set the tick count to CX:DX */
1051 Bda->TickCounter = MAKELONG(LOWORD(Edx), LOWORD(Ecx));
1052
1053 /* Reset the midnight flag */
1054 Bda->MidnightPassed = FALSE;
1055
1056 break;
1057 }
1058
1059 default:
1060 {
1061 DPRINT1("BIOS Function INT 1Ah, AH = 0x%02X NOT IMPLEMENTED\n",
1062 HIBYTE(Eax));
1063 }
1064 }
1065 }
1066
1067 VOID BiosSystemTimerInterrupt(LPWORD Stack)
1068 {
1069 /* Increase the system tick count */
1070 Bda->TickCounter++;
1071 }
1072
1073 VOID BiosEquipmentService(LPWORD Stack)
1074 {
1075 /* Return the equipment list */
1076 EmulatorSetRegister(EMULATOR_REG_AX, Bda->EquipmentList);
1077 }
1078
1079 VOID BiosHandleIrq(BYTE IrqNumber, LPWORD Stack)
1080 {
1081 switch (IrqNumber)
1082 {
1083 /* PIT IRQ */
1084 case 0:
1085 {
1086 /* Perform the system timer interrupt */
1087 EmulatorInterrupt(BIOS_SYS_TIMER_INTERRUPT);
1088
1089 break;
1090 }
1091
1092 /* Keyboard IRQ */
1093 case 1:
1094 {
1095 BYTE ScanCode, VirtualKey;
1096 WORD Character;
1097
1098 /* Check if there is a scancode available */
1099 if (!(KeyboardReadStatus() & 1)) break;
1100
1101 /* Get the scan code and virtual key code */
1102 ScanCode = KeyboardReadData();
1103 VirtualKey = MapVirtualKey(ScanCode & 0x7F, MAPVK_VSC_TO_VK);
1104
1105 /* Check if this is a key press or release */
1106 if (!(ScanCode & (1 << 7)))
1107 {
1108 /* Key press */
1109 if (VirtualKey == VK_NUMLOCK
1110 || VirtualKey == VK_CAPITAL
1111 || VirtualKey == VK_SCROLL)
1112 {
1113 /* For toggle keys, toggle the lowest bit in the keyboard map */
1114 BiosKeyboardMap[VirtualKey] ^= ~(1 << 0);
1115 }
1116
1117 /* Set the highest bit */
1118 BiosKeyboardMap[VirtualKey] |= (1 << 7);
1119
1120 /* Find out which character this is */
1121 if (ToAscii(VirtualKey, ScanCode, BiosKeyboardMap, &Character, 0) > 0)
1122 {
1123 /* Push it onto the BIOS keyboard queue */
1124 BiosKbdBufferPush((ScanCode << 8) | (Character & 0xFF));
1125 }
1126 }
1127 else
1128 {
1129 /* Key release, unset the highest bit */
1130 BiosKeyboardMap[VirtualKey] &= ~(1 << 7);
1131 }
1132
1133 break;
1134 }
1135 }
1136
1137 /* Send End-of-Interrupt to the PIC */
1138 if (IrqNumber > 8) PicWriteCommand(PIC_SLAVE_CMD, PIC_OCW2_EOI);
1139 PicWriteCommand(PIC_MASTER_CMD, PIC_OCW2_EOI);
1140 }
1141
1142 /* EOF */