d721b88b03bd1fa52a80f6e974dfa6e2d8d3556b
[reactos.git] / reactos / hal / halx86 / display.c
1 /*
2 * ReactOS kernel
3 * Copyright (C) 1998, 1999, 2000, 2001, 2002 ReactOS Team
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19 /* $Id: display.c,v 1.10 2003/08/27 20:56:26 dwelch Exp $
20 *
21 * COPYRIGHT: See COPYING in the top level directory
22 * PROJECT: ReactOS kernel
23 * FILE: ntoskrnl/hal/x86/display.c
24 * PURPOSE: Blue screen display
25 * PROGRAMMER: Eric Kohl (ekohl@rz-online.de)
26 * UPDATE HISTORY:
27 * Created 08/10/99
28 */
29
30 /*
31 * Portions of this code are from the XFree86 Project and available from the
32 * following license:
33 *
34 * Copyright (C) 1994-2003 The XFree86 Project, Inc. All Rights Reserved.
35 *
36 * Permission is hereby granted, free of charge, to any person obtaining a copy
37 * of this software and associated documentation files (the "Software"), to
38 * deal in the Software without restriction, including without limitation the
39 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
40 * sell copies of the Software, and to permit persons to whom the Software is
41 * furnished to do so, subject to the following conditions:
42 *
43 * The above copyright notice and this permission notice shall be included in
44 * all copies or substantial portions of the Software.
45 *
46 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
47 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
48 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
49 * XFREE86 PROJECT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
50 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CON-
51 * NECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
52 *
53 * Except as contained in this notice, the name of the XFree86 Project shall
54 * not be used in advertising or otherwise to promote the sale, use or other
55 * dealings in this Software without prior written authorization from the
56 * XFree86 Project.
57 */
58
59 /* DISPLAY OWNERSHIP
60 *
61 * So, who owns the physical display and is allowed to write to it?
62 *
63 * In MS NT, upon boot HAL owns the display. Somewhere in the boot
64 * sequence (haven't figured out exactly where or by who), some
65 * component calls HalAcquireDisplayOwnership. From that moment on,
66 * the display is owned by that component and is switched to graphics
67 * mode. The display is not supposed to return to text mode, except
68 * in case of a bug check. The bug check will call HalDisplayString
69 * to output a string to the text screen. HAL will notice that it
70 * currently doesn't own the display and will re-take ownership, by
71 * calling the callback function passed to HalAcquireDisplayOwnership.
72 * After the bugcheck, execution is halted. So, under NT, the only
73 * possible sequence of display modes is text mode -> graphics mode ->
74 * text mode (the latter hopefully happening very infrequently).
75 *
76 * Things are a little bit different in the current state of ReactOS.
77 * We want to have a functional interactive text mode. We should be
78 * able to switch from text mode to graphics mode when a GUI app is
79 * started and switch back to text mode when it's finished. Then, when
80 * another GUI app is started, another switch to and from graphics mode
81 * is possible. Also, when the system bugchecks in graphics mode we want
82 * to switch back to text mode to show the registers and stack trace.
83 * Last but not least, HalDisplayString is used a lot more in ReactOS,
84 * e.g. to print debug messages when the /DEBUGPORT=SCREEN boot option
85 * is present.
86 * 3 Components are involved in Reactos: HAL, BLUE.SYS and VIDEOPRT.SYS.
87 * As in NT, on boot HAL owns the display. When entering the text mode
88 * command interpreter, BLUE.SYS kicks in. It will write directly to the
89 * screen, more or less behind HALs back.
90 * When a GUI app is started, WIN32K.SYS will open the DISPLAY device.
91 * This open call will end up in VIDEOPRT.SYS. That component will then
92 * take ownership of the display by calling HalAcquireDisplayOwnership.
93 * When the GUI app terminates (WIN32K.SYS will close the DISPLAY device),
94 * we want to give ownership of the display back to HAL. Using the
95 * standard exported HAL functions, that's a bit of a problem, because
96 * there is no function defined to do that. In NT, this is handled by
97 * HalDisplayString, but that solution isn't satisfactory in ReactOS,
98 * because HalDisplayString is (in some cases) also used to output debug
99 * messages. If we do it the NT way, the first debug message output while
100 * in graphics mode would switch the display back to text mode.
101 * So, instead, if HalDisplayString detects that HAL doesn't have ownership
102 * of the display, it doesn't do anything.
103 * To return ownership to HAL, a new function is exported,
104 * HalReleaseDisplayOwnership. This function is called by the DISPLAY
105 * device Close routine in VIDEOPRT.SYS. It is also called at the beginning
106 * of a bug check, so HalDisplayString is activated again.
107 * Now, while the display is in graphics mode (not owned by HAL), BLUE.SYS
108 * should also refrain from writing to the screen buffer. The text mode
109 * screen buffer might overlap the graphics mode screen buffer, so changing
110 * something in the text mode buffer might mess up the graphics screen. To
111 * allow BLUE.SYS to detect if HAL owns the display, another new function is
112 * exported, HalQueryDisplayOwnership. BLUE.SYS will call this function to
113 * check if it's allowed to touch the text mode buffer.
114 *
115 * In an ideal world, when HAL takes ownership of the display, it should set
116 * up the CRT using real-mode (actually V86 mode, but who cares) INT 0x10
117 * calls. Unfortunately, this will require HAL to setup a real-mode interrupt
118 * table etc. So, we chickened out of that by having the loader set up the
119 * display before switching to protected mode. If HAL is given back ownership
120 * after a GUI app terminates, the INT 0x10 calls are made by VIDEOPRT.SYS,
121 * since there is already support for them via the VideoPortInt10 routine.
122 */
123
124 #include <ddk/ntddk.h>
125 #include <mps.h>
126
127 #define SCREEN_SYNCHRONIZATION
128
129 #define VGA_AC_INDEX 0x3c0
130 #define VGA_AC_READ 0x3c1
131 #define VGA_AC_WRITE 0x3c0
132
133 #define VGA_MISC_WRITE 0x3c2
134
135 #define VGA_SEQ_INDEX 0x3c4
136 #define VGA_SEQ_DATA 0x3c5
137
138 #define VGA_DAC_MASK 0x3c6
139 #define VGA_DAC_READ_INDEX 0x3c7
140 #define VGA_DAC_WRITE_INDEX 0x3c8
141 #define VGA_DAC_DATA 0x3c9
142 #define VGA_FEATURE_READ 0x3ca
143 #define VGA_MISC_READ 0x3cc
144
145 #define VGA_GC_INDEX 0x3ce
146 #define VGA_GC_DATA 0x3cf
147
148 #define VGA_CRTC_INDEX 0x3d4
149 #define VGA_CRTC_DATA 0x3d5
150
151 #define VGA_INSTAT_READ 0x3da
152
153 #define VGA_SEQ_NUM_REGISTERS 5
154 #define VGA_CRTC_NUM_REGISTERS 25
155 #define VGA_GC_NUM_REGISTERS 9
156 #define VGA_AC_NUM_REGISTERS 21
157
158 #define CRTC_COLUMNS 0x01
159 #define CRTC_OVERFLOW 0x07
160 #define CRTC_ROWS 0x12
161 #define CRTC_SCANLINES 0x09
162
163 #define CRTC_CURHI 0x0e
164 #define CRTC_CURLO 0x0f
165
166
167 #define CHAR_ATTRIBUTE_BLACK 0x00 /* black on black */
168 #define CHAR_ATTRIBUTE 0x17 /* grey on blue */
169
170 #define FONT_AMOUNT (8*8192)
171
172 /* VARIABLES ****************************************************************/
173
174 static ULONG CursorX = 0; /* Cursor Position */
175 static ULONG CursorY = 0;
176 static ULONG SizeX = 80; /* Display size */
177 static ULONG SizeY = 25;
178
179 static BOOLEAN DisplayInitialized = FALSE;
180 static BOOLEAN HalOwnsDisplay = TRUE;
181
182 static WORD *VideoBuffer = NULL;
183 static PUCHAR GraphVideoBuffer = NULL;
184
185 static PHAL_RESET_DISPLAY_PARAMETERS HalResetDisplayParameters = NULL;
186
187 static UCHAR SavedTextPalette[768];
188 static UCHAR SavedTextMiscOutReg;
189 static UCHAR SavedTextCrtcReg[VGA_CRTC_NUM_REGISTERS];
190 static UCHAR SavedTextAcReg[VGA_AC_NUM_REGISTERS];
191 static UCHAR SavedTextGcReg[VGA_GC_NUM_REGISTERS];
192 static UCHAR SavedTextSeqReg[VGA_SEQ_NUM_REGISTERS];
193 static UCHAR SavedTextFont[2][FONT_AMOUNT];
194 static BOOL TextPaletteEnabled = FALSE;
195
196 /* STATIC FUNCTIONS *********************************************************/
197
198 VOID
199 HalClearDisplay (UCHAR CharAttribute)
200 {
201 WORD *ptr = (WORD*)VideoBuffer;
202 ULONG i;
203
204 for (i = 0; i < SizeX * SizeY; i++, ptr++)
205 *ptr = ((CharAttribute << 8) + ' ');
206
207 CursorX = 0;
208 CursorY = 0;
209 }
210
211
212 VOID
213 HalScrollDisplay (VOID)
214 {
215 WORD *ptr;
216 int i;
217
218 ptr = VideoBuffer + SizeX;
219 RtlMoveMemory(VideoBuffer,
220 ptr,
221 SizeX * (SizeY - 1) * 2);
222
223 ptr = VideoBuffer + (SizeX * (SizeY - 1));
224 for (i = 0; i < SizeX; i++, ptr++)
225 {
226 *ptr = (CHAR_ATTRIBUTE << 8) + ' ';
227 }
228 }
229
230
231 static VOID
232 HalPutCharacter (CHAR Character)
233 {
234 WORD *ptr;
235
236 ptr = VideoBuffer + ((CursorY * SizeX) + CursorX);
237 *ptr = (CHAR_ATTRIBUTE << 8) + Character;
238 }
239
240 VOID STATIC
241 HalDisablePalette(VOID)
242 {
243 (VOID)READ_PORT_UCHAR((PUCHAR)VGA_INSTAT_READ);
244 WRITE_PORT_UCHAR((PUCHAR)VGA_AC_INDEX, 0x20);
245 TextPaletteEnabled = FALSE;
246 }
247
248 VOID STATIC
249 HalEnablePalette(VOID)
250 {
251 (VOID)READ_PORT_UCHAR((PUCHAR)VGA_INSTAT_READ);
252 WRITE_PORT_UCHAR((PUCHAR)VGA_AC_INDEX, 0x00);
253 TextPaletteEnabled = TRUE;
254 }
255
256 UCHAR STATIC
257 HalReadGc(ULONG Index)
258 {
259 WRITE_PORT_UCHAR((PUCHAR)VGA_GC_INDEX, Index);
260 return(READ_PORT_UCHAR((PUCHAR)VGA_GC_DATA));
261 }
262
263 VOID STATIC
264 HalWriteGc(ULONG Index, UCHAR Value)
265 {
266 WRITE_PORT_UCHAR((PUCHAR)VGA_GC_INDEX, Index);
267 WRITE_PORT_UCHAR((PUCHAR)VGA_GC_DATA, Value);
268 }
269
270 UCHAR STATIC
271 HalReadSeq(ULONG Index)
272 {
273 WRITE_PORT_UCHAR((PUCHAR)VGA_SEQ_INDEX, Index);
274 return(READ_PORT_UCHAR((PUCHAR)VGA_SEQ_DATA));
275 }
276
277 VOID STATIC
278 HalWriteSeq(ULONG Index, UCHAR Value)
279 {
280 WRITE_PORT_UCHAR((PUCHAR)VGA_SEQ_INDEX, Index);
281 WRITE_PORT_UCHAR((PUCHAR)VGA_SEQ_DATA, Value);
282 }
283
284 VOID STATIC
285 HalWriteAc(ULONG Index, UCHAR Value)
286 {
287 if (TextPaletteEnabled)
288 {
289 Index &= ~0x20;
290 }
291 else
292 {
293 Index |= 0x20;
294 }
295 (VOID)READ_PORT_UCHAR((PUCHAR)VGA_INSTAT_READ);
296 WRITE_PORT_UCHAR((PUCHAR)VGA_AC_INDEX, Index);
297 WRITE_PORT_UCHAR((PUCHAR)VGA_AC_WRITE, Value);
298 }
299
300 UCHAR STATIC
301 HalReadAc(ULONG Index)
302 {
303 if (TextPaletteEnabled)
304 {
305 Index &= ~0x20;
306 }
307 else
308 {
309 Index |= 0x20;
310 }
311 (VOID)READ_PORT_UCHAR((PUCHAR)VGA_INSTAT_READ);
312 WRITE_PORT_UCHAR((PUCHAR)VGA_AC_INDEX, Index);
313 return(READ_PORT_UCHAR((PUCHAR)VGA_AC_READ));
314 }
315
316 VOID STATIC
317 HalWriteCrtc(ULONG Index, UCHAR Value)
318 {
319 WRITE_PORT_UCHAR((PUCHAR)VGA_CRTC_INDEX, Index);
320 WRITE_PORT_UCHAR((PUCHAR)VGA_CRTC_DATA, Value);
321 }
322
323 UCHAR STATIC
324 HalReadCrtc(ULONG Index)
325 {
326 WRITE_PORT_UCHAR((PUCHAR)VGA_CRTC_INDEX, Index);
327 return(READ_PORT_UCHAR((PUCHAR)VGA_CRTC_DATA));
328 }
329
330 VOID STATIC
331 HalResetSeq(BOOL Start)
332 {
333 if (Start)
334 {
335 HalWriteSeq(0x00, 0x01);
336 }
337 else
338 {
339 HalWriteSeq(0x00, 0x03);
340 }
341 }
342
343 VOID STATIC
344 HalBlankScreen(BOOL On)
345 {
346 UCHAR Scrn;
347
348 Scrn = HalReadSeq(0x01);
349
350 if (On)
351 {
352 Scrn &= ~0x20;
353 }
354 else
355 {
356 Scrn |= 0x20;
357 }
358
359 HalResetSeq(TRUE);
360 HalWriteSeq(0x01, Scrn);
361 HalResetSeq(FALSE);
362 }
363
364 VOID STATIC
365 HalSaveFont(VOID)
366 {
367 UCHAR Attr10;
368 UCHAR MiscOut, Gc4, Gc5, Gc6, Seq2, Seq4;
369 ULONG i;
370
371 /* Check if we are already in graphics mode. */
372 Attr10 = HalReadAc(0x10);
373 if (Attr10 & 0x01)
374 {
375 return;
376 }
377
378 /* Save registers. */
379 MiscOut = READ_PORT_UCHAR((PUCHAR)VGA_MISC_READ);
380 Gc4 = HalReadGc(0x04);
381 Gc5 = HalReadGc(0x05);
382 Gc6 = HalReadGc(0x06);
383 Seq2 = HalReadSeq(0x02);
384 Seq4 = HalReadSeq(0x04);
385
386 /* Force colour mode. */
387 WRITE_PORT_UCHAR((PUCHAR)VGA_MISC_WRITE, MiscOut | 0x01);
388
389 HalBlankScreen(FALSE);
390
391 for (i = 0; i < 2; i++)
392 {
393 /* Save font 1 */
394 HalWriteSeq(0x02, 0x04 << i); /* Write to plane 2 or 3 */
395 HalWriteSeq(0x04, 0x06); /* Enable plane graphics. */
396 HalWriteGc(0x04, 0x02 + i); /* Read plane 2 or 3 */
397 HalWriteGc(0x05, 0x00); /* Write mode 0; read mode 0 */
398 HalWriteGc(0x06, 0x05); /* Set graphics. */
399 memcpy(SavedTextFont[i], GraphVideoBuffer, FONT_AMOUNT);
400 }
401
402 /* Restore registers. */
403 HalWriteAc(0x10, Attr10);
404 HalWriteSeq(0x02, Seq2);
405 HalWriteSeq(0x04, Seq4);
406 HalWriteGc(0x04, Gc4);
407 HalWriteGc(0x05, Gc5);
408 HalWriteGc(0x06, Gc6);
409 WRITE_PORT_UCHAR((PUCHAR)VGA_MISC_WRITE, MiscOut);
410
411 HalBlankScreen(TRUE);
412 }
413
414 VOID STATIC
415 HalSaveMode(VOID)
416 {
417 ULONG i;
418
419 SavedTextMiscOutReg = READ_PORT_UCHAR((PUCHAR)VGA_MISC_READ);
420
421 for (i = 0; i < VGA_CRTC_NUM_REGISTERS; i++)
422 {
423 SavedTextCrtcReg[i] = HalReadCrtc(i);
424 }
425
426 HalEnablePalette();
427 for (i = 0; i < VGA_AC_NUM_REGISTERS; i++)
428 {
429 SavedTextAcReg[i] = HalReadAc(i);
430 }
431 HalDisablePalette();
432
433 for (i = 0; i < VGA_GC_NUM_REGISTERS; i++)
434 {
435 SavedTextGcReg[i] = HalReadGc(i);
436 }
437
438 for (i = 0; i < VGA_SEQ_NUM_REGISTERS; i++)
439 {
440 SavedTextSeqReg[i] = HalReadSeq(i);
441 }
442 }
443
444 VOID STATIC
445 HalDacDelay(VOID)
446 {
447 (VOID)READ_PORT_UCHAR((PUCHAR)VGA_INSTAT_READ);
448 (VOID)READ_PORT_UCHAR((PUCHAR)VGA_INSTAT_READ);
449 }
450
451 VOID STATIC
452 HalSavePalette(VOID)
453 {
454 ULONG i;
455 WRITE_PORT_UCHAR((PUCHAR)VGA_DAC_MASK, 0xFF);
456 WRITE_PORT_UCHAR((PUCHAR)VGA_DAC_READ_INDEX, 0x00);
457 for (i = 0; i < 768; i++)
458 {
459 SavedTextPalette[i] = READ_PORT_UCHAR((PUCHAR)VGA_DAC_DATA);
460 HalDacDelay();
461 }
462 }
463
464 VOID STATIC
465 HalRestoreFont(VOID)
466 {
467 UCHAR MiscOut, Attr10, Gc1, Gc3, Gc4, Gc5, Gc6, Gc8;
468 UCHAR Seq2, Seq4;
469 ULONG i;
470
471 /* Save registers. */
472 MiscOut = READ_PORT_UCHAR((PUCHAR)VGA_MISC_READ);
473 Attr10 = HalReadAc(0x10);
474 Gc1 = HalReadGc(0x01);
475 Gc3 = HalReadGc(0x03);
476 Gc4 = HalReadGc(0x04);
477 Gc5 = HalReadGc(0x05);
478 Gc6 = HalReadGc(0x06);
479 Gc8 = HalReadGc(0x08);
480 Seq2 = HalReadSeq(0x02);
481 Seq4 = HalReadSeq(0x04);
482
483 /* Force into colour mode. */
484 WRITE_PORT_UCHAR((PUCHAR)VGA_MISC_WRITE, MiscOut | 0x10);
485
486 HalBlankScreen(FALSE);
487
488 HalWriteGc(0x03, 0x00); /* Don't rotate; write unmodified. */
489 HalWriteGc(0x08, 0xFF); /* Write all bits. */
490 HalWriteGc(0x01, 0x00); /* All planes from CPU. */
491
492 for (i = 0; i < 2; i++)
493 {
494 HalWriteSeq(0x02, 0x04 << i); /* Write to plane 2 or 3 */
495 HalWriteSeq(0x04, 0x06); /* Enable plane graphics. */
496 HalWriteGc(0x04, 0x02 + i); /* Read plane 2 or 3 */
497 HalWriteGc(0x05, 0x00); /* Write mode 0; read mode 0. */
498 HalWriteGc(0x06, 0x05); /* Set graphics. */
499 memcpy(GraphVideoBuffer, SavedTextFont[i], FONT_AMOUNT);
500 }
501
502 HalBlankScreen(TRUE);
503
504 /* Restore registers. */
505 WRITE_PORT_UCHAR((PUCHAR)VGA_MISC_WRITE, MiscOut);
506 HalWriteAc(0x10, Attr10);
507 HalWriteGc(0x01, Gc1);
508 HalWriteGc(0x03, Gc3);
509 HalWriteGc(0x04, Gc4);
510 HalWriteGc(0x05, Gc5);
511 HalWriteGc(0x06, Gc6);
512 HalWriteGc(0x08, Gc8);
513 HalWriteSeq(0x02, Seq2);
514 HalWriteSeq(0x04, Seq4);
515 }
516
517 VOID STATIC
518 HalRestoreMode(VOID)
519 {
520 ULONG i;
521
522 WRITE_PORT_UCHAR((PUCHAR)VGA_MISC_WRITE, SavedTextMiscOutReg);
523
524 for (i = 1; i < VGA_SEQ_NUM_REGISTERS; i++)
525 {
526 HalWriteSeq(i, SavedTextSeqReg[i]);
527 }
528
529 /* Unlock CRTC registers 0-7 */
530 HalWriteCrtc(17, SavedTextCrtcReg[17] & ~0x80);
531
532 for (i = 0; i < VGA_CRTC_NUM_REGISTERS; i++)
533 {
534 HalWriteCrtc(i, SavedTextCrtcReg[i]);
535 }
536
537 for (i = 0; i < VGA_GC_NUM_REGISTERS; i++)
538 {
539 HalWriteGc(i, SavedTextGcReg[i]);
540 }
541
542 HalEnablePalette();
543 for (i = 0; i < VGA_AC_NUM_REGISTERS; i++)
544 {
545 HalWriteAc(i, SavedTextAcReg[i]);
546 }
547 HalDisablePalette();
548 }
549
550 VOID STATIC
551 HalRestorePalette(VOID)
552 {
553 ULONG i;
554 WRITE_PORT_UCHAR((PUCHAR)VGA_DAC_MASK, 0xFF);
555 WRITE_PORT_UCHAR((PUCHAR)VGA_DAC_WRITE_INDEX, 0x00);
556 for (i = 0; i < 768; i++)
557 {
558 WRITE_PORT_UCHAR((PUCHAR)VGA_DAC_DATA, SavedTextPalette[i]);
559 HalDacDelay();
560 }
561 HalDisablePalette();
562 }
563
564 /* PRIVATE FUNCTIONS ********************************************************/
565
566 VOID
567 HalInitializeDisplay (PLOADER_PARAMETER_BLOCK LoaderBlock)
568 /*
569 * FUNCTION: Initalize the display
570 * ARGUMENTS:
571 * InitParameters = Parameters setup by the boot loader
572 */
573 {
574 if (DisplayInitialized == FALSE)
575 {
576 ULONG ScanLines;
577 ULONG Data;
578
579 VideoBuffer = (WORD *)(0xd0000000 + 0xb8000);
580 GraphVideoBuffer = (PUCHAR)(0xd0000000 + 0xa0000);
581 // VideoBuffer = HalMapPhysicalMemory (0xb8000, 2);
582
583 /* Set cursor position */
584 // CursorX = LoaderBlock->cursorx;
585 // CursorY = LoaderBlock->cursory;
586 CursorX = 0;
587 CursorY = 0;
588
589 /* read screen size from the crtc */
590 /* FIXME: screen size should be read from the boot parameters */
591 WRITE_PORT_UCHAR((PUCHAR)VGA_CRTC_INDEX, CRTC_COLUMNS);
592 SizeX = READ_PORT_UCHAR((PUCHAR)VGA_CRTC_DATA) + 1;
593 WRITE_PORT_UCHAR((PUCHAR)VGA_CRTC_INDEX, CRTC_ROWS);
594 SizeY = READ_PORT_UCHAR((PUCHAR)VGA_CRTC_DATA);
595 WRITE_PORT_UCHAR((PUCHAR)VGA_CRTC_INDEX, CRTC_OVERFLOW);
596 Data = READ_PORT_UCHAR((PUCHAR)VGA_CRTC_DATA);
597 SizeY |= (((Data & 0x02) << 7) | ((Data & 0x40) << 3));
598 SizeY++;
599 WRITE_PORT_UCHAR((PUCHAR)VGA_CRTC_INDEX, CRTC_SCANLINES);
600 ScanLines = (READ_PORT_UCHAR((PUCHAR)VGA_CRTC_DATA) & 0x1F) + 1;
601 SizeY = SizeY / ScanLines;
602
603 #ifdef BOCHS_30ROWS
604 SizeY=30;
605 #endif
606 HalClearDisplay(CHAR_ATTRIBUTE_BLACK);
607
608 DisplayInitialized = TRUE;
609
610 /*
611 Save the VGA state at this point so we can restore it on a bugcheck.
612 */
613 HalSavePalette();
614 HalSaveMode();
615 HalSaveFont();
616 }
617 }
618
619
620 /* PUBLIC FUNCTIONS *********************************************************/
621
622 VOID STDCALL
623 HalReleaseDisplayOwnership()
624 /*
625 * FUNCTION: Release ownership of display back to HAL
626 */
627 {
628 if (HalResetDisplayParameters == NULL)
629 return;
630
631 if (HalOwnsDisplay == TRUE)
632 return;
633
634 if (!HalResetDisplayParameters(SizeX, SizeY))
635 {
636 HalRestoreMode();
637 HalRestoreFont();
638 HalRestorePalette();
639 }
640 HalOwnsDisplay = TRUE;
641 HalClearDisplay(CHAR_ATTRIBUTE);
642 }
643
644
645 VOID STDCALL
646 HalAcquireDisplayOwnership(IN PHAL_RESET_DISPLAY_PARAMETERS ResetDisplayParameters)
647 /*
648 * FUNCTION:
649 * ARGUMENTS:
650 * ResetDisplayParameters = Pointer to a driver specific
651 * reset routine.
652 */
653 {
654 HalOwnsDisplay = FALSE;
655 HalResetDisplayParameters = ResetDisplayParameters;
656 }
657
658 VOID STDCALL
659 HalDisplayString(IN PCH String)
660 /*
661 * FUNCTION: Switches the screen to HAL console mode (BSOD) if not there
662 * already and displays a string
663 * ARGUMENT:
664 * string = ASCII string to display
665 * NOTE: Use with care because there is no support for returning from BSOD
666 * mode
667 */
668 {
669 PCH pch;
670 #ifdef SCREEN_SYNCHRONIZATION
671 int offset;
672 #endif
673 static KSPIN_LOCK Lock;
674 ULONG Flags;
675
676 /* See comment at top of file */
677 if (! HalOwnsDisplay)
678 {
679 return;
680 }
681
682 pch = String;
683
684 pushfl(Flags);
685 __asm__ ("cli\n\t");
686 KeAcquireSpinLockAtDpcLevel(&Lock);
687
688 #if 0
689 if (HalOwnsDisplay == FALSE)
690 {
691 HalReleaseDisplayOwnership();
692 }
693 #endif
694
695 #ifdef SCREEN_SYNCHRONIZATION
696 WRITE_PORT_UCHAR((PUCHAR)VGA_CRTC_INDEX, CRTC_CURHI);
697 offset = READ_PORT_UCHAR((PUCHAR)VGA_CRTC_DATA)<<8;
698 WRITE_PORT_UCHAR((PUCHAR)VGA_CRTC_INDEX, CRTC_CURLO);
699 offset += READ_PORT_UCHAR((PUCHAR)VGA_CRTC_DATA);
700
701 CursorY = offset / SizeX;
702 CursorX = offset % SizeX;
703 #endif
704
705 while (*pch != 0)
706 {
707 if (*pch == '\n')
708 {
709 CursorY++;
710 CursorX = 0;
711 }
712 else if (*pch == '\b')
713 {
714 if (CursorX > 0)
715 {
716 CursorX--;
717 }
718 }
719 else if (*pch != '\r')
720 {
721 HalPutCharacter (*pch);
722 CursorX++;
723
724 if (CursorX >= SizeX)
725 {
726 CursorY++;
727 CursorX = 0;
728 }
729 }
730
731 if (CursorY >= SizeY)
732 {
733 HalScrollDisplay ();
734 CursorY = SizeY - 1;
735 }
736
737 pch++;
738 }
739
740 #ifdef SCREEN_SYNCHRONIZATION
741 offset = (CursorY * SizeX) + CursorX;
742
743 WRITE_PORT_UCHAR((PUCHAR)VGA_CRTC_INDEX, CRTC_CURLO);
744 WRITE_PORT_UCHAR((PUCHAR)VGA_CRTC_DATA, offset & 0xff);
745 WRITE_PORT_UCHAR((PUCHAR)VGA_CRTC_INDEX, CRTC_CURHI);
746 WRITE_PORT_UCHAR((PUCHAR)VGA_CRTC_DATA, (offset >> 8) & 0xff);
747 #endif
748 KeReleaseSpinLockFromDpcLevel(&Lock);
749 popfl(Flags);
750 }
751
752 VOID STDCALL
753 HalQueryDisplayParameters(OUT PULONG DispSizeX,
754 OUT PULONG DispSizeY,
755 OUT PULONG CursorPosX,
756 OUT PULONG CursorPosY)
757 {
758 if (DispSizeX)
759 *DispSizeX = SizeX;
760 if (DispSizeY)
761 *DispSizeY = SizeY;
762 if (CursorPosX)
763 *CursorPosX = CursorX;
764 if (CursorPosY)
765 *CursorPosY = CursorY;
766 }
767
768
769 VOID STDCALL
770 HalSetDisplayParameters(IN ULONG CursorPosX,
771 IN ULONG CursorPosY)
772 {
773 CursorX = (CursorPosX < SizeX) ? CursorPosX : SizeX - 1;
774 CursorY = (CursorPosY < SizeY) ? CursorPosY : SizeY - 1;
775 }
776
777 BOOLEAN STDCALL
778 HalQueryDisplayOwnership()
779 {
780 return ! HalOwnsDisplay;
781 }
782
783 /* EOF */