[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 /* Read from 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++] = 0x83; // add sp, 2
482 BiosCode[Offset++] = 0xC4;
483 BiosCode[Offset++] = 0x02;
484
485 BiosCode[Offset++] = 0xCF; // iret
486 }
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 /* Initialize the PIC */
540 PicWriteCommand(PIC_MASTER_CMD, PIC_ICW1 | PIC_ICW1_ICW4);
541 PicWriteCommand(PIC_SLAVE_CMD , PIC_ICW1 | PIC_ICW1_ICW4);
542
543 /* Set the interrupt offsets */
544 PicWriteData(PIC_MASTER_DATA, BIOS_PIC_MASTER_INT);
545 PicWriteData(PIC_SLAVE_DATA , BIOS_PIC_SLAVE_INT);
546
547 /* Tell the master PIC there is a slave at IRQ 2 */
548 PicWriteData(PIC_MASTER_DATA, 1 << 2);
549 PicWriteData(PIC_SLAVE_DATA , 2);
550
551 /* Make sure the PIC is in 8086 mode */
552 PicWriteData(PIC_MASTER_DATA, PIC_ICW4_8086);
553 PicWriteData(PIC_SLAVE_DATA , PIC_ICW4_8086);
554
555 /* Clear the masks for both PICs */
556 PicWriteData(PIC_MASTER_DATA, 0x00);
557 PicWriteData(PIC_SLAVE_DATA , 0x00);
558
559 PitWriteCommand(0x34);
560 PitWriteData(0, 0x00);
561 PitWriteData(0, 0x00);
562
563 return TRUE;
564 }
565
566 VOID BiosCleanup(VOID)
567 {
568 /* Restore the old screen buffer */
569 SetConsoleActiveScreenBuffer(BiosConsoleOutput);
570
571 /* Restore the screen buffer size */
572 SetConsoleScreenBufferSize(BiosConsoleOutput, BiosSavedBufferInfo.dwSize);
573
574 /* Close the console handles */
575 if (BiosConsoleOutput != INVALID_HANDLE_VALUE) CloseHandle(BiosConsoleOutput);
576 if (BiosConsoleInput != INVALID_HANDLE_VALUE) CloseHandle(BiosConsoleInput);
577 }
578
579 WORD BiosPeekCharacter(VOID)
580 {
581 WORD CharacterData;
582
583 /* Check if there is a key available */
584 if (Bda->KeybdBufferHead == Bda->KeybdBufferTail) return 0xFFFF;
585
586 /* Get the key from the queue, but don't remove it */
587 BiosKbdBufferTop(&CharacterData);
588
589 return CharacterData;
590 }
591
592 WORD BiosGetCharacter(VOID)
593 {
594 WORD CharacterData;
595 INPUT_RECORD InputRecord;
596 DWORD Count;
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 while (TRUE)
608 {
609 /* Wait for a console event */
610 WaitForSingleObject(BiosConsoleInput, INFINITE);
611
612 /* Read the event, and make sure it's a keypress */
613 if (!ReadConsoleInput(BiosConsoleInput, &InputRecord, 1, &Count)) continue;
614 if (InputRecord.EventType != KEY_EVENT) continue;
615 if (!InputRecord.Event.KeyEvent.bKeyDown) continue;
616
617 /* Save the scan code and end the loop */
618 CharacterData = (InputRecord.Event.KeyEvent.wVirtualScanCode << 8)
619 | InputRecord.Event.KeyEvent.uChar.AsciiChar;
620
621 break;
622 }
623 }
624
625 return CharacterData;
626 }
627
628 VOID BiosSetCursorPosition(BYTE Row, BYTE Column, BYTE Page)
629 {
630 /* Make sure the selected video page is valid */
631 if (Page >= BIOS_MAX_PAGES) return;
632
633 /* Update the position in the BDA */
634 Bda->CursorPosition[Page] = (Row << 8) | Column;
635
636 /* Check if this is the current video page */
637 if (Page == Bda->VideoPage)
638 {
639 WORD Offset = Row * Bda->ScreenColumns + Column;
640
641 /* Modify the CRTC registers */
642 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_LOC_LOW_REG);
643 VgaWritePort(VGA_CRTC_DATA , LOBYTE(Offset));
644 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_LOC_HIGH_REG);
645 VgaWritePort(VGA_CRTC_DATA , HIBYTE(Offset));
646 }
647 }
648
649 BOOLEAN BiosScrollWindow(INT Direction,
650 DWORD Amount,
651 SMALL_RECT Rectangle,
652 BYTE Page,
653 BYTE FillAttribute)
654 {
655 DWORD i;
656 LPWORD WindowData;
657 DWORD WindowSize = (Rectangle.Bottom - Rectangle.Top + 1)
658 * (Rectangle.Right - Rectangle.Left + 1);
659
660 /* Allocate a buffer for the window */
661 WindowData = (LPWORD)HeapAlloc(GetProcessHeap(),
662 HEAP_ZERO_MEMORY,
663 WindowSize * sizeof(WORD));
664 if (WindowData == NULL) return FALSE;
665
666 /* Read the window data */
667 BiosReadWindow(WindowData, Rectangle, Page);
668
669 if (Amount == 0)
670 {
671 /* Fill the window */
672 for (i = 0; i < WindowSize; i++)
673 {
674 WindowData[i] = ' ' | (FillAttribute << 8);
675 }
676
677 goto Done;
678 }
679
680 // TODO: Scroll the window!
681
682 Done:
683 /* Write back the window data */
684 BiosWriteWindow(WindowData, Rectangle, Page);
685
686 /* Free the window buffer */
687 HeapFree(GetProcessHeap(), 0, WindowData);
688
689 return TRUE;
690 }
691
692 VOID BiosPrintCharacter(CHAR Character, BYTE Attribute, BYTE Page)
693 {
694 WORD CharData = (Attribute << 8) | Character;
695 BYTE Row, Column;
696
697 /* Make sure the page exists */
698 if (Page >= BIOS_MAX_PAGES) return;
699
700 /* Get the cursor location */
701 Row = HIBYTE(Bda->CursorPosition[Page]);
702 Column = LOBYTE(Bda->CursorPosition[Page]);
703
704 /* Write the character */
705 VgaWriteMemory(TO_LINEAR(TEXT_VIDEO_SEG,
706 (Row * Bda->ScreenColumns + Column) * sizeof(WORD)),
707 (LPVOID)&CharData,
708 sizeof(WORD));
709
710 /* Advance the cursor */
711 Column++;
712
713 /* Check if it passed the end of the row */
714 if (Column == Bda->ScreenColumns)
715 {
716 /* Return to the first column */
717 Column = 0;
718
719 if (Row == Bda->ScreenRows)
720 {
721 /* The screen must be scrolled */
722 SMALL_RECT Rectangle = { 0, 0, Bda->ScreenColumns - 1, Bda->ScreenRows };
723
724 BiosScrollWindow(SCROLL_DIRECTION_UP,
725 1,
726 Rectangle,
727 Page,
728 DEFAULT_ATTRIBUTE);
729 }
730 else Row++;
731 }
732
733 /* Set the cursor position */
734 BiosSetCursorPosition(Row, Column, Page);
735 }
736
737 VOID BiosVideoService(LPWORD Stack)
738 {
739 DWORD Eax = EmulatorGetRegister(EMULATOR_REG_AX);
740 DWORD Ecx = EmulatorGetRegister(EMULATOR_REG_CX);
741 DWORD Edx = EmulatorGetRegister(EMULATOR_REG_DX);
742 DWORD Ebx = EmulatorGetRegister(EMULATOR_REG_BX);
743
744 switch (HIBYTE(Eax))
745 {
746 /* Set Video Mode */
747 case 0x00:
748 {
749 BiosSetVideoMode(LOBYTE(Eax));
750 VgaClearMemory();
751 break;
752 }
753
754 /* Set Text-Mode Cursor Shape */
755 case 0x01:
756 {
757 /* Update the BDA */
758 Bda->CursorStartLine = HIBYTE(Ecx);
759 Bda->CursorEndLine = LOBYTE(Ecx);
760
761 /* Modify the CRTC registers */
762 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_START_REG);
763 VgaWritePort(VGA_CRTC_DATA , Bda->CursorStartLine);
764 VgaWritePort(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_END_REG);
765 VgaWritePort(VGA_CRTC_DATA , Bda->CursorEndLine);
766
767 break;
768 }
769
770 /* Set Cursor Position */
771 case 0x02:
772 {
773 BiosSetCursorPosition(HIBYTE(Edx), LOBYTE(Edx), HIBYTE(Ebx));
774 break;
775 }
776
777 /* Get Cursor Position */
778 case 0x03:
779 {
780 /* Make sure the selected video page exists */
781 if (HIBYTE(Ebx) >= BIOS_MAX_PAGES) break;
782
783 /* Return the result */
784 EmulatorSetRegister(EMULATOR_REG_AX, 0);
785 EmulatorSetRegister(EMULATOR_REG_CX,
786 (Bda->CursorStartLine << 8) | Bda->CursorEndLine);
787 EmulatorSetRegister(EMULATOR_REG_DX, Bda->CursorPosition[HIBYTE(Ebx)]);
788
789 break;
790 }
791
792 /* Query Light Pen */
793 case 0x04:
794 {
795 /*
796 * On modern BIOSes, this function returns 0
797 * so that we can ignore the other registers.
798 */
799 EmulatorSetRegister(EMULATOR_REG_AX, 0);
800 break;
801 }
802
803 /* Select Active Display Page */
804 case 0x05:
805 {
806 BiosSetVideoPage(LOBYTE(Eax));
807 break;
808 }
809
810 /* Scroll Window Up/Down */
811 case 0x06:
812 case 0x07:
813 {
814 SMALL_RECT Rectangle =
815 {
816 LOBYTE(Ecx),
817 HIBYTE(Ecx),
818 LOBYTE(Edx),
819 HIBYTE(Edx)
820 };
821
822 /* Call the internal function */
823 BiosScrollWindow((HIBYTE(Eax) == 0x06)
824 ? SCROLL_DIRECTION_UP : SCROLL_DIRECTION_DOWN,
825 LOBYTE(Eax),
826 Rectangle,
827 Bda->VideoPage,
828 HIBYTE(Ebx));
829
830 break;
831 }
832
833 /* Read/Write Character From Cursor Position */
834 case 0x08:
835 case 0x09:
836 case 0x0A:
837 {
838 WORD CharacterData = MAKEWORD(LOBYTE(Eax), LOBYTE(Ebx));
839 BYTE Page = HIBYTE(Ebx);
840 DWORD Offset;
841
842 /* Check if the page exists */
843 if (Page >= BIOS_MAX_PAGES) break;
844
845 /* Find the offset of the character */
846 Offset = Page * Bda->VideoPageSize
847 + (HIBYTE(Bda->CursorPosition[Page]) * Bda->ScreenColumns
848 + LOBYTE(Bda->CursorPosition[Page])) * 2;
849
850 if (HIBYTE(Eax) == 0x08)
851 {
852 /* Read from the video memory */
853 VgaReadMemory(TO_LINEAR(TEXT_VIDEO_SEG, Offset),
854 (LPVOID)&CharacterData,
855 sizeof(WORD));
856
857 /* Return the character in AX */
858 EmulatorSetRegister(EMULATOR_REG_AX, CharacterData);
859 }
860 else
861 {
862 /* Write to video memory */
863 VgaWriteMemory(TO_LINEAR(TEXT_VIDEO_SEG, Offset),
864 (LPVOID)&CharacterData,
865 (HIBYTE(Ebx) == 0x09) ? sizeof(WORD) : sizeof(BYTE));
866 }
867
868 break;
869 }
870
871 /* Teletype Output */
872 case 0x0E:
873 {
874 BiosPrintCharacter(LOBYTE(Eax), LOBYTE(Ebx), HIBYTE(Ebx));
875 break;
876 }
877
878 /* Get Current Video Mode */
879 case 0x0F:
880 {
881 EmulatorSetRegister(EMULATOR_REG_AX,
882 MAKEWORD(Bda->VideoMode, Bda->ScreenColumns));
883 EmulatorSetRegister(EMULATOR_REG_BX,
884 MAKEWORD(LOBYTE(Ebx), Bda->VideoPage));
885
886 break;
887 }
888
889 /* Scroll Window */
890 case 0x12:
891 {
892 SMALL_RECT Rectangle =
893 {
894 LOBYTE(Ecx),
895 HIBYTE(Ecx),
896 LOBYTE(Edx),
897 HIBYTE(Edx)
898 };
899
900 /* Call the internal function */
901 BiosScrollWindow(LOBYTE(Ebx),
902 LOBYTE(Eax),
903 Rectangle,
904 Bda->VideoPage,
905 DEFAULT_ATTRIBUTE);
906
907 break;
908 }
909
910 /* Display combination code */
911 case 0x1A:
912 {
913 switch(LOBYTE(Eax))
914 {
915 case 0x00: /* Get Display combiantion code */
916 EmulatorSetRegister(EMULATOR_REG_AX, MAKEWORD(0x1A, 0x1A));
917 EmulatorSetRegister(EMULATOR_REG_BX, MAKEWORD(0x08, 0x0)); /* VGA w/ color analog display */
918 break;
919 case 0x01: /* Set Display combination code */
920 DPRINT1("Set Display combination code - Unsupported\n");
921 break;
922 default:
923 break;
924 }
925 break;
926 }
927
928 default:
929 {
930 DPRINT1("BIOS Function INT 10h, AH = 0x%02X NOT IMPLEMENTED\n",
931 HIBYTE(Eax));
932 }
933 }
934 }
935
936 VOID BiosKeyboardService(LPWORD Stack)
937 {
938 DWORD Eax = EmulatorGetRegister(EMULATOR_REG_AX);
939
940 switch (HIBYTE(Eax))
941 {
942 case 0x00:
943 {
944 /* Read the character (and wait if necessary) */
945 EmulatorSetRegister(EMULATOR_REG_AX, BiosGetCharacter());
946
947 break;
948 }
949
950 case 0x01:
951 {
952 WORD Data = BiosPeekCharacter();
953
954 if (Data != 0xFFFF)
955 {
956 /* There is a character, clear ZF and return it */
957 EmulatorSetRegister(EMULATOR_REG_AX, Data);
958 Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_ZF;
959 }
960 else
961 {
962 /* No character, set ZF */
963 Stack[STACK_FLAGS] |= EMULATOR_FLAG_ZF;
964 }
965
966 break;
967 }
968
969 default:
970 {
971 DPRINT1("BIOS Function INT 16h, AH = 0x%02X NOT IMPLEMENTED\n",
972 HIBYTE(Eax));
973 }
974 }
975 }
976
977 VOID BiosTimeService(LPWORD Stack)
978 {
979 DWORD Eax = EmulatorGetRegister(EMULATOR_REG_AX);
980 DWORD Ecx = EmulatorGetRegister(EMULATOR_REG_CX);
981 DWORD Edx = EmulatorGetRegister(EMULATOR_REG_DX);
982
983 switch (HIBYTE(Eax))
984 {
985 case 0x00:
986 {
987 /* Set AL to 1 if midnight had passed, 0 otherwise */
988 Eax &= 0xFFFFFF00;
989 if (Bda->MidnightPassed) Eax |= 1;
990
991 /* Return the tick count in CX:DX */
992 EmulatorSetRegister(EMULATOR_REG_AX, Eax);
993 EmulatorSetRegister(EMULATOR_REG_CX, HIWORD(Bda->TickCounter));
994 EmulatorSetRegister(EMULATOR_REG_DX, LOWORD(Bda->TickCounter));
995
996 /* Reset the midnight flag */
997 Bda->MidnightPassed = FALSE;
998
999 break;
1000 }
1001
1002 case 0x01:
1003 {
1004 /* Set the tick count to CX:DX */
1005 Bda->TickCounter = MAKELONG(LOWORD(Edx), LOWORD(Ecx));
1006
1007 /* Reset the midnight flag */
1008 Bda->MidnightPassed = FALSE;
1009
1010 break;
1011 }
1012
1013 default:
1014 {
1015 DPRINT1("BIOS Function INT 1Ah, AH = 0x%02X NOT IMPLEMENTED\n",
1016 HIBYTE(Eax));
1017 }
1018 }
1019 }
1020
1021 VOID BiosSystemTimerInterrupt(LPWORD Stack)
1022 {
1023 /* Increase the system tick count */
1024 Bda->TickCounter++;
1025 }
1026
1027 VOID BiosEquipmentService(LPWORD Stack)
1028 {
1029 /* Return the equipment list */
1030 EmulatorSetRegister(EMULATOR_REG_AX, Bda->EquipmentList);
1031 }
1032
1033 VOID BiosHandleIrq(BYTE IrqNumber, LPWORD Stack)
1034 {
1035 switch (IrqNumber)
1036 {
1037 /* PIT IRQ */
1038 case 0:
1039 {
1040 /* Perform the system timer interrupt */
1041 EmulatorInterrupt(BIOS_SYS_TIMER_INTERRUPT);
1042
1043 break;
1044 }
1045
1046 /* Keyboard IRQ */
1047 case 1:
1048 {
1049 BYTE ScanCode, VirtualKey;
1050 WORD Character;
1051
1052 /* Check if there is a scancode available */
1053 if (!(KeyboardReadStatus() & 1)) break;
1054
1055 /* Get the scan code and virtual key code */
1056 ScanCode = KeyboardReadData();
1057 VirtualKey = MapVirtualKey(ScanCode & 0x7F, MAPVK_VSC_TO_VK);
1058
1059 /* Check if this is a key press or release */
1060 if (!(ScanCode & (1 << 7)))
1061 {
1062 /* Key press */
1063 if (VirtualKey == VK_NUMLOCK
1064 || VirtualKey == VK_CAPITAL
1065 || VirtualKey == VK_SCROLL)
1066 {
1067 /* For toggle keys, toggle the lowest bit in the keyboard map */
1068 BiosKeyboardMap[VirtualKey] ^= ~(1 << 0);
1069 }
1070
1071 /* Set the highest bit */
1072 BiosKeyboardMap[VirtualKey] |= (1 << 7);
1073
1074 /* Find out which character this is */
1075 if (ToAscii(VirtualKey, ScanCode, BiosKeyboardMap, &Character, 0) > 0)
1076 {
1077 /* Push it onto the BIOS keyboard queue */
1078 BiosKbdBufferPush((ScanCode << 8) | (Character & 0xFF));
1079 }
1080 }
1081 else
1082 {
1083 /* Key release, unset the highest bit */
1084 BiosKeyboardMap[VirtualKey] &= ~(1 << 7);
1085 }
1086
1087 break;
1088 }
1089 }
1090
1091 /* Send End-of-Interrupt to the PIC */
1092 if (IrqNumber > 8) PicWriteCommand(PIC_SLAVE_CMD, PIC_OCW2_EOI);
1093 PicWriteCommand(PIC_MASTER_CMD, PIC_OCW2_EOI);
1094 }
1095
1096 /* EOF */