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