aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/video/uvesafb.c
blob: cdbb56edb6cbdde9b34231b5e985c70c3e39efb4 (plain) (tree)
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006












































                                                                       
                                                                           
                                                                           







































































































































                                                                             

                             






















                                                                                











                                                                   

                 

























































































































































































































































































































































































































































































































































































































































































                                                                                
                     







































                                                                               
                 

                                            
      














































































































































































                                                                                

                                   
                 

                                            






















































































































































































































































































































































































































































                                                                                
                                                             




































































































































































































































































































































































































































































                                                                                
                                                                  



                 
                                                                     












                                       
                                                                


                                            
                                                               






































                                                                               
/*
 * A framebuffer driver for VBE 2.0+ compliant video cards
 *
 * (c) 2007 Michal Januszewski <spock@gentoo.org>
 *     Loosely based upon the vesafb driver.
 *
 */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/skbuff.h>
#include <linux/timer.h>
#include <linux/completion.h>
#include <linux/connector.h>
#include <linux/random.h>
#include <linux/platform_device.h>
#include <linux/limits.h>
#include <linux/fb.h>
#include <linux/io.h>
#include <linux/mutex.h>
#include <video/edid.h>
#include <video/uvesafb.h>
#ifdef CONFIG_X86
#include <video/vga.h>
#endif
#ifdef CONFIG_MTRR
#include <asm/mtrr.h>
#endif
#include "edid.h"

static struct cb_id uvesafb_cn_id = {
	.idx = CN_IDX_V86D,
	.val = CN_VAL_V86D_UVESAFB
};
static char v86d_path[PATH_MAX] = "/sbin/v86d";
static char v86d_started;	/* has v86d been started by uvesafb? */

static struct fb_fix_screeninfo uvesafb_fix __devinitdata = {
	.id	= "VESA VGA",
	.type	= FB_TYPE_PACKED_PIXELS,
	.accel	= FB_ACCEL_NONE,
	.visual = FB_VISUAL_TRUECOLOR,
};

static int mtrr		__devinitdata = 3; /* enable mtrr by default */
static int blank	= 1;		   /* enable blanking by default */
static int ypan		= 1; 		 /* 0: scroll, 1: ypan, 2: ywrap */
static int pmi_setpal	__devinitdata = 1; /* use PMI for palette changes */
static int nocrtc	__devinitdata; /* ignore CRTC settings */
static int noedid	__devinitdata; /* don't try DDC transfers */
static int vram_remap	__devinitdata; /* set amt. of memory to be used */
static int vram_total	__devinitdata; /* set total amount of memory */
static u16 maxclk	__devinitdata; /* maximum pixel clock */
static u16 maxvf	__devinitdata; /* maximum vertical frequency */
static u16 maxhf	__devinitdata; /* maximum horizontal frequency */
static u16 vbemode	__devinitdata; /* force use of a specific VBE mode */
static char *mode_option __devinitdata;

static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX];
static DEFINE_MUTEX(uvfb_lock);

/*
 * A handler for replies from userspace.
 *
 * Make sure each message passes consistency checks and if it does,
 * find the kernel part of the task struct, copy the registers and
 * the buffer contents and then complete the task.
 */
static void uvesafb_cn_callback(void *data)
{
	struct cn_msg *msg = data;
	struct uvesafb_task *utask;
	struct uvesafb_ktask *task;

	if (msg->seq >= UVESAFB_TASKS_MAX)
		return;

	mutex_lock(&uvfb_lock);
	task = uvfb_tasks[msg->seq];

	if (!task || msg->ack != task->ack) {
		mutex_unlock(&uvfb_lock);
		return;
	}

	utask = (struct uvesafb_task *)msg->data;

	/* Sanity checks for the buffer length. */
	if (task->t.buf_len < utask->buf_len ||
	    utask->buf_len > msg->len - sizeof(*utask)) {
		mutex_unlock(&uvfb_lock);
		return;
	}

	uvfb_tasks[msg->seq] = NULL;
	mutex_unlock(&uvfb_lock);

	memcpy(&task->t, utask, sizeof(*utask));

	if (task->t.buf_len && task->buf)
		memcpy(task->buf, utask + 1, task->t.buf_len);

	complete(task->done);
	return;
}

static int uvesafb_helper_start(void)
{
	char *envp[] = {
		"HOME=/",
		"PATH=/sbin:/bin",
		NULL,
	};

	char *argv[] = {
		v86d_path,
		NULL,
	};

	return call_usermodehelper(v86d_path, argv, envp, 1);
}

/*
 * Execute a uvesafb task.
 *
 * Returns 0 if the task is executed successfully.
 *
 * A message sent to the userspace consists of the uvesafb_task
 * struct and (optionally) a buffer. The uvesafb_task struct is
 * a simplified version of uvesafb_ktask (its kernel counterpart)
 * containing only the register values, flags and the length of
 * the buffer.
 *
 * Each message is assigned a sequence number (increased linearly)
 * and a random ack number. The sequence number is used as a key
 * for the uvfb_tasks array which holds pointers to uvesafb_ktask
 * structs for all requests.
 */
static int uvesafb_exec(struct uvesafb_ktask *task)
{
	static int seq;
	struct cn_msg *m;
	int err;
	int len = sizeof(task->t) + task->t.buf_len;

	/*
	 * Check whether the message isn't longer than the maximum
	 * allowed by connector.
	 */
	if (sizeof(*m) + len > CONNECTOR_MAX_MSG_SIZE) {
		printk(KERN_WARNING "uvesafb: message too long (%d), "
			"can't execute task\n", (int)(sizeof(*m) + len));
		return -E2BIG;
	}

	m = kzalloc(sizeof(*m) + len, GFP_KERNEL);
	if (!m)
		return -ENOMEM;

	init_completion(task->done);

	memcpy(&m->id, &uvesafb_cn_id, sizeof(m->id));
	m->seq = seq;
	m->len = len;
	m->ack = random32();

	/* uvesafb_task structure */
	memcpy(m + 1, &task->t, sizeof(task->t));

	/* Buffer */
	memcpy((u8 *)(m + 1) + sizeof(task->t), task->buf, task->t.buf_len);

	/*
	 * Save the message ack number so that we can find the kernel
	 * part of this task when a reply is received from userspace.
	 */
	task->ack = m->ack;

	mutex_lock(&uvfb_lock);

	/* If all slots are taken -- bail out. */
	if (uvfb_tasks[seq]) {
		mutex_unlock(&uvfb_lock);
		err = -EBUSY;
		goto out;
	}

	/* Save a pointer to the kernel part of the task struct. */
	uvfb_tasks[seq] = task;
	mutex_unlock(&uvfb_lock);

	err = cn_netlink_send(m, 0, gfp_any());
	if (err == -ESRCH) {
		/*
		 * Try to start the userspace helper if sending
		 * the request failed the first time.
		 */
		err = uvesafb_helper_start();
		if (err) {
			printk(KERN_ERR "uvesafb: failed to execute %s\n",
					v86d_path);
			printk(KERN_ERR "uvesafb: make sure that the v86d "
					"helper is installed and executable\n");
		} else {
			v86d_started = 1;
			err = cn_netlink_send(m, 0, gfp_any());
		}
	}

	if (!err && !(task->t.flags & TF_EXIT))
		err = !wait_for_completion_timeout(task->done,
				msecs_to_jiffies(UVESAFB_TIMEOUT));

	mutex_lock(&uvfb_lock);
	uvfb_tasks[seq] = NULL;
	mutex_unlock(&uvfb_lock);

	seq++;
	if (seq >= UVESAFB_TASKS_MAX)
		seq = 0;
out:
	kfree(m);
	return err;
}

/*
 * Free a uvesafb_ktask struct.
 */
static void uvesafb_free(struct uvesafb_ktask *task)
{
	if (task) {
		if (task->done)
			kfree(task->done);
		kfree(task);
	}
}

/*
 * Prepare a uvesafb_ktask struct to be used again.
 */
static void uvesafb_reset(struct uvesafb_ktask *task)
{
	struct completion *cpl = task->done;

	memset(task, 0, sizeof(*task));
	task->done = cpl;
}

/*
 * Allocate and prepare a uvesafb_ktask struct.
 */
static struct uvesafb_ktask *uvesafb_prep(void)
{
	struct uvesafb_ktask *task;

	task = kzalloc(sizeof(*task), GFP_KERNEL);
	if (task) {
		task->done = kzalloc(sizeof(*task->done), GFP_KERNEL);
		if (!task->done) {
			kfree(task);
			task = NULL;
		}
	}
	return task;
}

static void uvesafb_setup_var(struct fb_var_screeninfo *var,
		struct fb_info *info, struct vbe_mode_ib *mode)
{
	struct uvesafb_par *par = info->par;

	var->vmode = FB_VMODE_NONINTERLACED;
	var->sync = FB_SYNC_VERT_HIGH_ACT;

	var->xres = mode->x_res;
	var->yres = mode->y_res;
	var->xres_virtual = mode->x_res;
	var->yres_virtual = (par->ypan) ?
			info->fix.smem_len / mode->bytes_per_scan_line :
			mode->y_res;
	var->xoffset = 0;
	var->yoffset = 0;
	var->bits_per_pixel = mode->bits_per_pixel;

	if (var->bits_per_pixel == 15)
		var->bits_per_pixel = 16;

	if (var->bits_per_pixel > 8) {
		var->red.offset    = mode->red_off;
		var->red.length    = mode->red_len;
		var->green.offset  = mode->green_off;
		var->green.length  = mode->green_len;
		var->blue.offset   = mode->blue_off;
		var->blue.length   = mode->blue_len;
		var->transp.offset = mode->rsvd_off;
		var->transp.length = mode->rsvd_len;
	} else {
		var->red.offset    = 0;
		var->green.offset  = 0;
		var->blue.offset   = 0;
		var->transp.offset = 0;

		/*
		 * We're assuming that we can switch the DAC to 8 bits. If
		 * this proves to be incorrect, we'll update the fields
		 * later in set_par().
		 */
		if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC) {
			var->red.length    = 8;
			var->green.length  = 8;
			var->blue.length   = 8;
			var->transp.length = 0;
		} else {
			var->red.length    = 6;
			var->green.length  = 6;
			var->blue.length   = 6;
			var->transp.length = 0;
		}
	}
}

static int uvesafb_vbe_find_mode(struct uvesafb_par *par,
		int xres, int yres, int depth, unsigned char flags)
{
	int i, match = -1, h = 0, d = 0x7fffffff;

	for (i = 0; i < par->vbe_modes_cnt; i++) {
		h = abs(par->vbe_modes[i].x_res - xres) +
		    abs(par->vbe_modes[i].y_res - yres) +
		    abs(depth - par->vbe_modes[i].depth);

		/*
		 * We have an exact match in terms of resolution
		 * and depth.
		 */
		if (h == 0)
			return i;

		if (h < d || (h == d && par->vbe_modes[i].depth > depth)) {
			d = h;
			match = i;
		}
	}
	i = 1;

	if (flags & UVESAFB_EXACT_DEPTH &&
			par->vbe_modes[match].depth != depth)
		i = 0;

	if (flags & UVESAFB_EXACT_RES && d > 24)
		i = 0;

	if (i != 0)
		return match;
	else
		return -1;
}

static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par)
{
	struct uvesafb_ktask *task;
	u8 *state;
	int err;

	if (!par->vbe_state_size)
		return NULL;

	state = kmalloc(par->vbe_state_size, GFP_KERNEL);
	if (!state)
		return NULL;

	task = uvesafb_prep();
	if (!task) {
		kfree(state);
		return NULL;
	}

	task->t.regs.eax = 0x4f04;
	task->t.regs.ecx = 0x000f;
	task->t.regs.edx = 0x0001;
	task->t.flags = TF_BUF_RET | TF_BUF_ESBX;
	task->t.buf_len = par->vbe_state_size;
	task->buf = state;
	err = uvesafb_exec(task);

	if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
		printk(KERN_WARNING "uvesafb: VBE get state call "
				"failed (eax=0x%x, err=%d)\n",
				task->t.regs.eax, err);
		kfree(state);
		state = NULL;
	}

	uvesafb_free(task);
	return state;
}

static void uvesafb_vbe_state_restore(struct uvesafb_par *par, u8 *state_buf)
{
	struct uvesafb_ktask *task;
	int err;

	if (!state_buf)
		return;

	task = uvesafb_prep();
	if (!task)
		return;

	task->t.regs.eax = 0x4f04;
	task->t.regs.ecx = 0x000f;
	task->t.regs.edx = 0x0002;
	task->t.buf_len = par->vbe_state_size;
	task->t.flags = TF_BUF_ESBX;
	task->buf = state_buf;

	err = uvesafb_exec(task);
	if (err || (task->t.regs.eax & 0xffff) != 0x004f)
		printk(KERN_WARNING "uvesafb: VBE state restore call "
				"failed (eax=0x%x, err=%d)\n",
				task->t.regs.eax, err);

	uvesafb_free(task);
}

static int __devinit uvesafb_vbe_getinfo(struct uvesafb_ktask *task,
		struct uvesafb_par *par)
{
	int err;

	task->t.regs.eax = 0x4f00;
	task->t.flags = TF_VBEIB;
	task->t.buf_len = sizeof(struct vbe_ib);
	task->buf = &par->vbe_ib;
	strncpy(par->vbe_ib.vbe_signature, "VBE2", 4);

	err = uvesafb_exec(task);
	if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
		printk(KERN_ERR "uvesafb: Getting VBE info block failed "
				"(eax=0x%x, err=%d)\n", (u32)task->t.regs.eax,
				err);
		return -EINVAL;
	}

	if (par->vbe_ib.vbe_version < 0x0200) {
		printk(KERN_ERR "uvesafb: Sorry, pre-VBE 2.0 cards are "
				"not supported.\n");
		return -EINVAL;
	}

	if (!par->vbe_ib.mode_list_ptr) {
		printk(KERN_ERR "uvesafb: Missing mode list!\n");
		return -EINVAL;
	}

	printk(KERN_INFO "uvesafb: ");

	/*
	 * Convert string pointers and the mode list pointer into
	 * usable addresses. Print informational messages about the
	 * video adapter and its vendor.
	 */
	if (par->vbe_ib.oem_vendor_name_ptr)
		printk("%s, ",
			((char *)task->buf) + par->vbe_ib.oem_vendor_name_ptr);

	if (par->vbe_ib.oem_product_name_ptr)
		printk("%s, ",
			((char *)task->buf) + par->vbe_ib.oem_product_name_ptr);

	if (par->vbe_ib.oem_product_rev_ptr)
		printk("%s, ",
			((char *)task->buf) + par->vbe_ib.oem_product_rev_ptr);

	if (par->vbe_ib.oem_string_ptr)
		printk("OEM: %s, ",
			((char *)task->buf) + par->vbe_ib.oem_string_ptr);

	printk("VBE v%d.%d\n", ((par->vbe_ib.vbe_version & 0xff00) >> 8),
			par->vbe_ib.vbe_version & 0xff);

	return 0;
}

static int __devinit uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
		struct uvesafb_par *par)
{
	int off = 0, err;
	u16 *mode;

	par->vbe_modes_cnt = 0;

	/* Count available modes. */
	mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
	while (*mode != 0xffff) {
		par->vbe_modes_cnt++;
		mode++;
	}

	par->vbe_modes = kzalloc(sizeof(struct vbe_mode_ib) *
				par->vbe_modes_cnt, GFP_KERNEL);
	if (!par->vbe_modes)
		return -ENOMEM;

	/* Get info about all available modes. */
	mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
	while (*mode != 0xffff) {
		struct vbe_mode_ib *mib;

		uvesafb_reset(task);
		task->t.regs.eax = 0x4f01;
		task->t.regs.ecx = (u32) *mode;
		task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
		task->t.buf_len = sizeof(struct vbe_mode_ib);
		task->buf = par->vbe_modes + off;

		err = uvesafb_exec(task);
		if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
			printk(KERN_ERR "uvesafb: Getting mode info block "
				"for mode 0x%x failed (eax=0x%x, err=%d)\n",
				*mode, (u32)task->t.regs.eax, err);
			return -EINVAL;
		}

		mib = task->buf;
		mib->mode_id = *mode;

		/*
		 * We only want modes that are supported with the current
		 * hardware configuration, color, graphics and that have
		 * support for the LFB.
		 */
		if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
				 mib->bits_per_pixel >= 8)
			off++;
		else
			par->vbe_modes_cnt--;

		mode++;
		mib->depth = mib->red_len + mib->green_len + mib->blue_len;

		/*
		 * Handle 8bpp modes and modes with broken color component
		 * lengths.
		 */
		if (mib->depth == 0 || (mib->depth == 24 &&
					mib->bits_per_pixel == 32))
			mib->depth = mib->bits_per_pixel;
	}

	return 0;
}

/*
 * The Protected Mode Interface is 32-bit x86 code, so we only run it on
 * x86 and not x86_64.
 */
#ifdef CONFIG_X86_32
static int __devinit uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
		struct uvesafb_par *par)
{
	int i, err;

	uvesafb_reset(task);
	task->t.regs.eax = 0x4f0a;
	task->t.regs.ebx = 0x0;
	err = uvesafb_exec(task);

	if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
		par->pmi_setpal = par->ypan = 0;
	} else {
		par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
						+ task->t.regs.edi);
		par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
		par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
		printk(KERN_INFO "uvesafb: protected mode interface info at "
				 "%04x:%04x\n",
				 (u16)task->t.regs.es, (u16)task->t.regs.edi);
		printk(KERN_INFO "uvesafb: pmi: set display start = %p, "
				 "set palette = %p\n", par->pmi_start,
				 par->pmi_pal);

		if (par->pmi_base[3]) {
			printk(KERN_INFO "uvesafb: pmi: ports = ");
			for (i = par->pmi_base[3]/2;
					par->pmi_base[i] != 0xffff; i++)
				printk("%x ", par->pmi_base[i]);
			printk("\n");

			if (par->pmi_base[i] != 0xffff) {
				printk(KERN_INFO "uvesafb: can't handle memory"
						 " requests, pmi disabled\n");
				par->ypan = par->pmi_setpal = 0;
			}
		}
	}
	return 0;
}
#endif /* CONFIG_X86_32 */

/*
 * Check whether a video mode is supported by the Video BIOS and is
 * compatible with the monitor limits.
 */
static int __devinit uvesafb_is_valid_mode(struct fb_videomode *mode,
		struct fb_info *info)
{
	if (info->monspecs.gtf) {
		fb_videomode_to_var(&info->var, mode);
		if (fb_validate_mode(&info->var, info))
			return 0;
	}

	if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
				UVESAFB_EXACT_RES) == -1)
		return 0;

	return 1;
}

static int __devinit uvesafb_vbe_getedid(struct uvesafb_ktask *task,
		struct fb_info *info)
{
	struct uvesafb_par *par = info->par;
	int err = 0;

	if (noedid || par->vbe_ib.vbe_version < 0x0300)
		return -EINVAL;

	task->t.regs.eax = 0x4f15;
	task->t.regs.ebx = 0;
	task->t.regs.ecx = 0;
	task->t.buf_len = 0;
	task->t.flags = 0;

	err = uvesafb_exec(task);

	if ((task->t.regs.eax & 0xffff) != 0x004f || err)
		return -EINVAL;

	if ((task->t.regs.ebx & 0x3) == 3) {
		printk(KERN_INFO "uvesafb: VBIOS/hardware supports both "
				 "DDC1 and DDC2 transfers\n");
	} else if ((task->t.regs.ebx & 0x3) == 2) {
		printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC2 "
				 "transfers\n");
	} else if ((task->t.regs.ebx & 0x3) == 1) {
		printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC1 "
				 "transfers\n");
	} else {
		printk(KERN_INFO "uvesafb: VBIOS/hardware doesn't support "
				 "DDC transfers\n");
		return -EINVAL;
	}

	task->t.regs.eax = 0x4f15;
	task->t.regs.ebx = 1;
	task->t.regs.ecx = task->t.regs.edx = 0;
	task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
	task->t.buf_len = EDID_LENGTH;
	task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);

	err = uvesafb_exec(task);

	if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
		fb_edid_to_monspecs(task->buf, &info->monspecs);

		if (info->monspecs.vfmax && info->monspecs.hfmax) {
			/*
			 * If the maximum pixel clock wasn't specified in
			 * the EDID block, set it to 300 MHz.
			 */
			if (info->monspecs.dclkmax == 0)
				info->monspecs.dclkmax = 300 * 1000000;
			info->monspecs.gtf = 1;
		}
	} else {
		err = -EINVAL;
	}

	kfree(task->buf);
	return err;
}

static void __devinit uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task,
		struct fb_info *info)
{
	struct uvesafb_par *par = info->par;
	int i;

	memset(&info->monspecs, 0, sizeof(info->monspecs));

	/*
	 * If we don't get all necessary data from the EDID block,
	 * mark it as incompatible with the GTF and set nocrtc so
	 * that we always use the default BIOS refresh rate.
	 */
	if (uvesafb_vbe_getedid(task, info)) {
		info->monspecs.gtf = 0;
		par->nocrtc = 1;
	}

	/* Kernel command line overrides. */
	if (maxclk)
		info->monspecs.dclkmax = maxclk * 1000000;
	if (maxvf)
		info->monspecs.vfmax = maxvf;
	if (maxhf)
		info->monspecs.hfmax = maxhf * 1000;

	/*
	 * In case DDC transfers are not supported, the user can provide
	 * monitor limits manually. Lower limits are set to "safe" values.
	 */
	if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) {
		info->monspecs.dclkmin = 0;
		info->monspecs.vfmin = 60;
		info->monspecs.hfmin = 29000;
		info->monspecs.gtf = 1;
		par->nocrtc = 0;
	}

	if (info->monspecs.gtf)
		printk(KERN_INFO
			"uvesafb: monitor limits: vf = %d Hz, hf = %d kHz, "
			"clk = %d MHz\n", info->monspecs.vfmax,
			(int)(info->monspecs.hfmax / 1000),
			(int)(info->monspecs.dclkmax / 1000000));
	else
		printk(KERN_INFO "uvesafb: no monitor limits have been set, "
				 "default refresh rate will be used\n");

	/* Add VBE modes to the modelist. */
	for (i = 0; i < par->vbe_modes_cnt; i++) {
		struct fb_var_screeninfo var;
		struct vbe_mode_ib *mode;
		struct fb_videomode vmode;

		mode = &par->vbe_modes[i];
		memset(&var, 0, sizeof(var));

		var.xres = mode->x_res;
		var.yres = mode->y_res;

		fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info);
		fb_var_to_videomode(&vmode, &var);
		fb_add_videomode(&vmode, &info->modelist);
	}

	/* Add valid VESA modes to our modelist. */
	for (i = 0; i < VESA_MODEDB_SIZE; i++) {
		if (uvesafb_is_valid_mode((struct fb_videomode *)
						&vesa_modes[i], info))
			fb_add_videomode(&vesa_modes[i], &info->modelist);
	}

	for (i = 0; i < info->monspecs.modedb_len; i++) {
		if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info))
			fb_add_videomode(&info->monspecs.modedb[i],
					&info->modelist);
	}

	return;
}

static void __devinit uvesafb_vbe_getstatesize(struct uvesafb_ktask *task,
		struct uvesafb_par *par)
{
	int err;

	uvesafb_reset(task);

	/*
	 * Get the VBE state buffer size. We want all available
	 * hardware state data (CL = 0x0f).
	 */
	task->t.regs.eax = 0x4f04;
	task->t.regs.ecx = 0x000f;
	task->t.regs.edx = 0x0000;
	task->t.flags = 0;

	err = uvesafb_exec(task);

	if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
		printk(KERN_WARNING "uvesafb: VBE state buffer size "
			"cannot be determined (eax=0x%x, err=%d)\n",
			task->t.regs.eax, err);
		par->vbe_state_size = 0;
		return;
	}

	par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff);
}

static int __devinit uvesafb_vbe_init(struct fb_info *info)
{
	struct uvesafb_ktask *task = NULL;
	struct uvesafb_par *par = info->par;
	int err;

	task = uvesafb_prep();
	if (!task)
		return -ENOMEM;

	err = uvesafb_vbe_getinfo(task, par);
	if (err)
		goto out;

	err = uvesafb_vbe_getmodes(task, par);
	if (err)
		goto out;

	par->nocrtc = nocrtc;
#ifdef CONFIG_X86_32
	par->pmi_setpal = pmi_setpal;
	par->ypan = ypan;

	if (par->pmi_setpal || par->ypan)
		uvesafb_vbe_getpmi(task, par);
#else
	/* The protected mode interface is not available on non-x86. */
	par->pmi_setpal = par->ypan = 0;
#endif

	INIT_LIST_HEAD(&info->modelist);
	uvesafb_vbe_getmonspecs(task, info);
	uvesafb_vbe_getstatesize(task, par);

out:	uvesafb_free(task);
	return err;
}

static int __devinit uvesafb_vbe_init_mode(struct fb_info *info)
{
	struct list_head *pos;
	struct fb_modelist *modelist;
	struct fb_videomode *mode;
	struct uvesafb_par *par = info->par;
	int i, modeid;

	/* Has the user requested a specific VESA mode? */
	if (vbemode) {
		for (i = 0; i < par->vbe_modes_cnt; i++) {
			if (par->vbe_modes[i].mode_id == vbemode) {
				fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
							&info->var, info);
				/*
				 * With pixclock set to 0, the default BIOS
				 * timings will be used in set_par().
				 */
				info->var.pixclock = 0;
				modeid = i;
				goto gotmode;
			}
		}
		printk(KERN_INFO "uvesafb: requested VBE mode 0x%x is "
				 "unavailable\n", vbemode);
		vbemode = 0;
	}

	/* Count the modes in the modelist */
	i = 0;
	list_for_each(pos, &info->modelist)
		i++;

	/*
	 * Convert the modelist into a modedb so that we can use it with
	 * fb_find_mode().
	 */
	mode = kzalloc(i * sizeof(*mode), GFP_KERNEL);
	if (mode) {
		i = 0;
		list_for_each(pos, &info->modelist) {
			modelist = list_entry(pos, struct fb_modelist, list);
			mode[i] = modelist->mode;
			i++;
		}

		if (!mode_option)
			mode_option = UVESAFB_DEFAULT_MODE;

		i = fb_find_mode(&info->var, info, mode_option, mode, i,
			NULL, 8);

		kfree(mode);
	}

	/* fb_find_mode() failed */
	if (i == 0) {
		info->var.xres = 640;
		info->var.yres = 480;
		mode = (struct fb_videomode *)
				fb_find_best_mode(&info->var, &info->modelist);

		if (mode) {
			fb_videomode_to_var(&info->var, mode);
		} else {
			modeid = par->vbe_modes[0].mode_id;
			fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
				    &info->var, info);
			goto gotmode;
		}
	}

	/* Look for a matching VBE mode. */
	modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres,
			info->var.bits_per_pixel, UVESAFB_EXACT_RES);

	if (modeid == -1)
		return -EINVAL;

gotmode:
	uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]);

	/*
	 * If we are not VBE3.0+ compliant, we're done -- the BIOS will
	 * ignore our timings anyway.
	 */
	if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc)
		fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
					&info->var, info);

	return modeid;
}

static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
		int start, struct fb_info *info)
{
	struct uvesafb_ktask *task;
#ifdef CONFIG_X86
	struct uvesafb_par *par = info->par;
	int i = par->mode_idx;
#endif
	int err = 0;

	/*
	 * We support palette modifications for 8 bpp modes only, so
	 * there can never be more than 256 entries.
	 */
	if (start + count > 256)
		return -EINVAL;

#ifdef CONFIG_X86
	/* Use VGA registers if mode is VGA-compatible. */
	if (i >= 0 && i < par->vbe_modes_cnt &&
	    par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) {
		for (i = 0; i < count; i++) {
			outb_p(start + i,        dac_reg);
			outb_p(entries[i].red,   dac_val);
			outb_p(entries[i].green, dac_val);
			outb_p(entries[i].blue,  dac_val);
		}
	}
#ifdef CONFIG_X86_32
	else if (par->pmi_setpal) {
		__asm__ __volatile__(
		"call *(%%esi)"
		: /* no return value */
		: "a" (0x4f09),         /* EAX */
		  "b" (0),              /* EBX */
		  "c" (count),          /* ECX */
		  "d" (start),          /* EDX */
		  "D" (entries),        /* EDI */
		  "S" (&par->pmi_pal)); /* ESI */
	}
#endif /* CONFIG_X86_32 */
	else
#endif /* CONFIG_X86 */
	{
		task = uvesafb_prep();
		if (!task)
			return -ENOMEM;

		task->t.regs.eax = 0x4f09;
		task->t.regs.ebx = 0x0;
		task->t.regs.ecx = count;
		task->t.regs.edx = start;
		task->t.flags = TF_BUF_ESDI;
		task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count;
		task->buf = entries;

		err = uvesafb_exec(task);
		if ((task->t.regs.eax & 0xffff) != 0x004f)
			err = 1;

		uvesafb_free(task);
	}
	return err;
}

static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
		unsigned blue, unsigned transp,
		struct fb_info *info)
{
	struct uvesafb_pal_entry entry;
	int shift = 16 - info->var.green.length;
	int err = 0;

	if (regno >= info->cmap.len)
		return -EINVAL;

	if (info->var.bits_per_pixel == 8) {
		entry.red   = red   >> shift;
		entry.green = green >> shift;
		entry.blue  = blue  >> shift;
		entry.pad   = 0;

		err = uvesafb_setpalette(&entry, 1, regno, info);
	} else if (regno < 16) {
		switch (info->var.bits_per_pixel) {
		case 16:
			if (info->var.red.offset == 10) {
				/* 1:5:5:5 */
				((u32 *) (info->pseudo_palette))[regno] =
						((red   & 0xf800) >>  1) |
						((green & 0xf800) >>  6) |
						((blue  & 0xf800) >> 11);
			} else {
				/* 0:5:6:5 */
				((u32 *) (info->pseudo_palette))[regno] =
						((red   & 0xf800)      ) |
						((green & 0xfc00) >>  5) |
						((blue  & 0xf800) >> 11);
			}
			break;

		case 24:
		case 32:
			red   >>= 8;
			green >>= 8;
			blue  >>= 8;
			((u32 *)(info->pseudo_palette))[regno] =
				(red   << info->var.red.offset)   |
				(green << info->var.green.offset) |
				(blue  << info->var.blue.offset);
			break;
		}
	}
	return err;
}

static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
{
	struct uvesafb_pal_entry *entries;
	int shift = 16 - info->var.green.length;
	int i, err = 0;

	if (info->var.bits_per_pixel == 8) {
		if (cmap->start + cmap->len > info->cmap.start +
		    info->cmap.len || cmap->start < info->cmap.start)
			return -EINVAL;

		entries = kmalloc(sizeof(*entries) * cmap->len, GFP_KERNEL);
		if (!entries)
			return -ENOMEM;

		for (i = 0; i < cmap->len; i++) {
			entries[i].red   = cmap->red[i]   >> shift;
			entries[i].green = cmap->green[i] >> shift;
			entries[i].blue  = cmap->blue[i]  >> shift;
			entries[i].pad   = 0;
		}
		err = uvesafb_setpalette(entries, cmap->len, cmap->start, info);
		kfree(entries);
	} else {
		/*
		 * For modes with bpp > 8, we only set the pseudo palette in
		 * the fb_info struct. We rely on uvesafb_setcolreg to do all
		 * sanity checking.
		 */
		for (i = 0; i < cmap->len; i++) {
			err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i],
						cmap->green[i], cmap->blue[i],
						0, info);
		}
	}
	return err;
}

static int uvesafb_pan_display(struct fb_var_screeninfo *var,
		struct fb_info *info)
{
#ifdef CONFIG_X86_32
	int offset;
	struct uvesafb_par *par = info->par;

	offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;

	/*
	 * It turns out it's not the best idea to do panning via vm86,
	 * so we only allow it if we have a PMI.
	 */
	if (par->pmi_start) {
		__asm__ __volatile__(
			"call *(%%edi)"
			: /* no return value */
			: "a" (0x4f07),         /* EAX */
			  "b" (0),              /* EBX */
			  "c" (offset),         /* ECX */
			  "d" (offset >> 16),   /* EDX */
			  "D" (&par->pmi_start));    /* EDI */
	}
#endif
	return 0;
}

static int uvesafb_blank(int blank, struct fb_info *info)
{
	struct uvesafb_ktask *task;
	int err = 1;
#ifdef CONFIG_X86
	struct uvesafb_par *par = info->par;

	if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
		int loop = 10000;
		u8 seq = 0, crtc17 = 0;

		if (blank == FB_BLANK_POWERDOWN) {
			seq = 0x20;
			crtc17 = 0x00;
			err = 0;
		} else {
			seq = 0x00;
			crtc17 = 0x80;
			err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
		}

		vga_wseq(NULL, 0x00, 0x01);
		seq |= vga_rseq(NULL, 0x01) & ~0x20;
		vga_wseq(NULL, 0x00, seq);

		crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
		while (loop--);
		vga_wcrt(NULL, 0x17, crtc17);
		vga_wseq(NULL, 0x00, 0x03);
	} else
#endif /* CONFIG_X86 */
	{
		task = uvesafb_prep();
		if (!task)
			return -ENOMEM;

		task->t.regs.eax = 0x4f10;
		switch (blank) {
		case FB_BLANK_UNBLANK:
			task->t.regs.ebx = 0x0001;
			break;
		case FB_BLANK_NORMAL:
			task->t.regs.ebx = 0x0101;	/* standby */
			break;
		case FB_BLANK_POWERDOWN:
			task->t.regs.ebx = 0x0401;	/* powerdown */
			break;
		default:
			goto out;
		}

		err = uvesafb_exec(task);
		if (err || (task->t.regs.eax & 0xffff) != 0x004f)
			err = 1;
out:		uvesafb_free(task);
	}
	return err;
}

static int uvesafb_open(struct fb_info *info, int user)
{
	struct uvesafb_par *par = info->par;
	int cnt = atomic_read(&par->ref_count);

	if (!cnt && par->vbe_state_size)
		par->vbe_state_orig = uvesafb_vbe_state_save(par);

	atomic_inc(&par->ref_count);
	return 0;
}

static int uvesafb_release(struct fb_info *info, int user)
{
	struct uvesafb_ktask *task = NULL;
	struct uvesafb_par *par = info->par;
	int cnt = atomic_read(&par->ref_count);

	if (!cnt)
		return -EINVAL;

	if (cnt != 1)
		goto out;

	task = uvesafb_prep();
	if (!task)
		goto out;

	/* First, try to set the standard 80x25 text mode. */
	task->t.regs.eax = 0x0003;
	uvesafb_exec(task);

	/*
	 * Now try to restore whatever hardware state we might have
	 * saved when the fb device was first opened.
	 */
	uvesafb_vbe_state_restore(par, par->vbe_state_orig);
out:
	atomic_dec(&par->ref_count);
	if (task)
		uvesafb_free(task);
	return 0;
}

static int uvesafb_set_par(struct fb_info *info)
{
	struct uvesafb_par *par = info->par;
	struct uvesafb_ktask *task = NULL;
	struct vbe_crtc_ib *crtc = NULL;
	struct vbe_mode_ib *mode = NULL;
	int i, err = 0, depth = info->var.bits_per_pixel;

	if (depth > 8 && depth != 32)
		depth = info->var.red.length + info->var.green.length +
			info->var.blue.length;

	i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
				 UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
	if (i >= 0)
		mode = &par->vbe_modes[i];
	else
		return -EINVAL;

	task = uvesafb_prep();
	if (!task)
		return -ENOMEM;
setmode:
	task->t.regs.eax = 0x4f02;
	task->t.regs.ebx = mode->mode_id | 0x4000;	/* use LFB */

	if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
	    info->var.pixclock != 0) {
		task->t.regs.ebx |= 0x0800;		/* use CRTC data */
		task->t.flags = TF_BUF_ESDI;
		crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
		if (!crtc) {
			err = -ENOMEM;
			goto out;
		}
		crtc->horiz_start = info->var.xres + info->var.right_margin;
		crtc->horiz_end	  = crtc->horiz_start + info->var.hsync_len;
		crtc->horiz_total = crtc->horiz_end + info->var.left_margin;

		crtc->vert_start  = info->var.yres + info->var.lower_margin;
		crtc->vert_end    = crtc->vert_start + info->var.vsync_len;
		crtc->vert_total  = crtc->vert_end + info->var.upper_margin;

		crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
		crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
				(crtc->vert_total * crtc->horiz_total)));

		if (info->var.vmode & FB_VMODE_DOUBLE)
			crtc->flags |= 0x1;
		if (info->var.vmode & FB_VMODE_INTERLACED)
			crtc->flags |= 0x2;
		if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
			crtc->flags |= 0x4;
		if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
			crtc->flags |= 0x8;
		memcpy(&par->crtc, crtc, sizeof(*crtc));
	} else {
		memset(&par->crtc, 0, sizeof(*crtc));
	}

	task->t.buf_len = sizeof(struct vbe_crtc_ib);
	task->buf = &par->crtc;

	err = uvesafb_exec(task);
	if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
		/*
		 * The mode switch might have failed because we tried to
		 * use our own timings.  Try again with the default timings.
		 */
		if (crtc != NULL) {
			printk(KERN_WARNING "uvesafb: mode switch failed "
				"(eax=0x%x, err=%d). Trying again with "
				"default timings.\n", task->t.regs.eax, err);
			uvesafb_reset(task);
			kfree(crtc);
			crtc = NULL;
			info->var.pixclock = 0;
			goto setmode;
		} else {
			printk(KERN_ERR "uvesafb: mode switch failed (eax="
				"0x%x, err=%d)\n", task->t.regs.eax, err);
			err = -EINVAL;
			goto out;
		}
	}
	par->mode_idx = i;

	/* For 8bpp modes, always try to set the DAC to 8 bits. */
	if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
	    mode->bits_per_pixel <= 8) {
		uvesafb_reset(task);
		task->t.regs.eax = 0x4f08;
		task->t.regs.ebx = 0x0800;

		err = uvesafb_exec(task);
		if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
		    ((task->t.regs.ebx & 0xff00) >> 8) != 8) {
			/*
			 * We've failed to set the DAC palette format -
			 * time to correct var.
			 */
			info->var.red.length    = 6;
			info->var.green.length  = 6;
			info->var.blue.length   = 6;
		}
	}

	info->fix.visual = (info->var.bits_per_pixel == 8) ?
				FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
	info->fix.line_length = mode->bytes_per_scan_line;

out:	if (crtc != NULL)
		kfree(crtc);
	uvesafb_free(task);

	return err;
}

static void uvesafb_check_limits(struct fb_var_screeninfo *var,
		struct fb_info *info)
{
	const struct fb_videomode *mode;
	struct uvesafb_par *par = info->par;

	/*
	 * If pixclock is set to 0, then we're using default BIOS timings
	 * and thus don't have to perform any checks here.
	 */
	if (!var->pixclock)
		return;

	if (par->vbe_ib.vbe_version < 0x0300) {
		fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
		return;
	}

	if (!fb_validate_mode(var, info))
		return;

	mode = fb_find_best_mode(var, &info->modelist);
	if (mode) {
		if (mode->xres == var->xres && mode->yres == var->yres &&
		    !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
			fb_videomode_to_var(var, mode);
			return;
		}
	}

	if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
		return;
	/* Use default refresh rate */
	var->pixclock = 0;
}

static int uvesafb_check_var(struct fb_var_screeninfo *var,
		struct fb_info *info)
{
	struct uvesafb_par *par = info->par;
	struct vbe_mode_ib *mode = NULL;
	int match = -1;
	int depth = var->red.length + var->green.length + var->blue.length;

	/*
	 * Various apps will use bits_per_pixel to set the color depth,
	 * which is theoretically incorrect, but which we'll try to handle
	 * here.
	 */
	if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
		depth = var->bits_per_pixel;

	match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
						UVESAFB_EXACT_RES);
	if (match == -1)
		return -EINVAL;

	mode = &par->vbe_modes[match];
	uvesafb_setup_var(var, info, mode);

	/*
	 * Check whether we have remapped enough memory for this mode.
	 * We might be called at an early stage, when we haven't remapped
	 * any memory yet, in which case we simply skip the check.
	 */
	if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
						&& info->fix.smem_len)
		return -EINVAL;

	if ((var->vmode & FB_VMODE_DOUBLE) &&
				!(par->vbe_modes[match].mode_attr & 0x100))
		var->vmode &= ~FB_VMODE_DOUBLE;

	if ((var->vmode & FB_VMODE_INTERLACED) &&
				!(par->vbe_modes[match].mode_attr & 0x200))
		var->vmode &= ~FB_VMODE_INTERLACED;

	uvesafb_check_limits(var, info);

	var->xres_virtual = var->xres;
	var->yres_virtual = (par->ypan) ?
				info->fix.smem_len / mode->bytes_per_scan_line :
				var->yres;
	return 0;
}

static void uvesafb_save_state(struct fb_info *info)
{
	struct uvesafb_par *par = info->par;

	if (par->vbe_state_saved)
		kfree(par->vbe_state_saved);

	par->vbe_state_saved = uvesafb_vbe_state_save(par);
}

static void uvesafb_restore_state(struct fb_info *info)
{
	struct uvesafb_par *par = info->par;

	uvesafb_vbe_state_restore(par, par->vbe_state_saved);
}

static struct fb_ops uvesafb_ops = {
	.owner		= THIS_MODULE,
	.fb_open	= uvesafb_open,
	.fb_release	= uvesafb_release,
	.fb_setcolreg	= uvesafb_setcolreg,
	.fb_setcmap	= uvesafb_setcmap,
	.fb_pan_display	= uvesafb_pan_display,
	.fb_blank	= uvesafb_blank,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
	.fb_check_var	= uvesafb_check_var,
	.fb_set_par	= uvesafb_set_par,
	.fb_save_state	= uvesafb_save_state,
	.fb_restore_state = uvesafb_restore_state,
};

static void __devinit uvesafb_init_info(struct fb_info *info,
		struct vbe_mode_ib *mode)
{
	unsigned int size_vmode;
	unsigned int size_remap;
	unsigned int size_total;
	struct uvesafb_par *par = info->par;
	int i, h;

	info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
	info->fix = uvesafb_fix;
	info->fix.ypanstep = par->ypan ? 1 : 0;
	info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;

	/*
	 * If we were unable to get the state buffer size, disable
	 * functions for saving and restoring the hardware state.
	 */
	if (par->vbe_state_size == 0) {
		info->fbops->fb_save_state = NULL;
		info->fbops->fb_restore_state = NULL;
	}

	/* Disable blanking if the user requested so. */
	if (!blank)
		info->fbops->fb_blank = NULL;

	/*
	 * Find out how much IO memory is required for the mode with
	 * the highest resolution.
	 */
	size_remap = 0;
	for (i = 0; i < par->vbe_modes_cnt; i++) {
		h = par->vbe_modes[i].bytes_per_scan_line *
					par->vbe_modes[i].y_res;
		if (h > size_remap)
			size_remap = h;
	}
	size_remap *= 2;

	/*
	 *   size_vmode -- that is the amount of memory needed for the
	 *                 used video mode, i.e. the minimum amount of
	 *                 memory we need.
	 */
	if (mode != NULL) {
		size_vmode = info->var.yres * mode->bytes_per_scan_line;
	} else {
		size_vmode = info->var.yres * info->var.xres *
			     ((info->var.bits_per_pixel + 7) >> 3);
	}

	/*
	 *   size_total -- all video memory we have. Used for mtrr
	 *                 entries, resource allocation and bounds
	 *                 checking.
	 */
	size_total = par->vbe_ib.total_memory * 65536;
	if (vram_total)
		size_total = vram_total * 1024 * 1024;
	if (size_total < size_vmode)
		size_total = size_vmode;

	/*
	 *   size_remap -- the amount of video memory we are going to
	 *                 use for vesafb.  With modern cards it is no
	 *                 option to simply use size_total as th
	 *                 wastes plenty of kernel address space.
	 */
	if (vram_remap)
		size_remap = vram_remap * 1024 * 1024;
	if (size_remap < size_vmode)
		size_remap = size_vmode;
	if (size_remap > size_total)
		size_remap = size_total;

	info->fix.smem_len = size_remap;
	info->fix.smem_start = mode->phys_base_ptr;

	/*
	 * We have to set yres_virtual here because when setup_var() was
	 * called, smem_len wasn't defined yet.
	 */
	info->var.yres_virtual = info->fix.smem_len /
				 mode->bytes_per_scan_line;

	if (par->ypan && info->var.yres_virtual > info->var.yres) {
		printk(KERN_INFO "uvesafb: scrolling: %s "
			"using protected mode interface, "
			"yres_virtual=%d\n",
			(par->ypan > 1) ? "ywrap" : "ypan",
			info->var.yres_virtual);
	} else {
		printk(KERN_INFO "uvesafb: scrolling: redraw\n");
		info->var.yres_virtual = info->var.yres;
		par->ypan = 0;
	}

	info->flags = FBINFO_FLAG_DEFAULT |
			(par->ypan) ? FBINFO_HWACCEL_YPAN : 0;

	if (!par->ypan)
		info->fbops->fb_pan_display = NULL;
}

static void __devinit uvesafb_init_mtrr(struct fb_info *info)
{
#ifdef CONFIG_MTRR
	if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
		int temp_size = info->fix.smem_len;
		unsigned int type = 0;

		switch (mtrr) {
		case 1:
			type = MTRR_TYPE_UNCACHABLE;
			break;
		case 2:
			type = MTRR_TYPE_WRBACK;
			break;
		case 3:
			type = MTRR_TYPE_WRCOMB;
			break;
		case 4:
			type = MTRR_TYPE_WRTHROUGH;
			break;
		default:
			type = 0;
			break;
		}

		if (type) {
			int rc;

			/* Find the largest power-of-two */
			while (temp_size & (temp_size - 1))
				temp_size &= (temp_size - 1);

			/* Try and find a power of two to add */
			do {
				rc = mtrr_add(info->fix.smem_start,
					      temp_size, type, 1);
				temp_size >>= 1;
			} while (temp_size >= PAGE_SIZE && rc == -EINVAL);
		}
	}
#endif /* CONFIG_MTRR */
}


static ssize_t uvesafb_show_vbe_ver(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
	struct uvesafb_par *par = info->par;

	return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
}

static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);

static ssize_t uvesafb_show_vbe_modes(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
	struct uvesafb_par *par = info->par;
	int ret = 0, i;

	for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
		ret += snprintf(buf + ret, PAGE_SIZE - ret,
			"%dx%d-%d, 0x%.4x\n",
			par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
			par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
	}

	return ret;
}

static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);

static ssize_t uvesafb_show_vendor(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
	struct uvesafb_par *par = info->par;

	if (par->vbe_ib.oem_vendor_name_ptr)
		return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
			(&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
	else
		return 0;
}

static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);

static ssize_t uvesafb_show_product_name(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
	struct uvesafb_par *par = info->par;

	if (par->vbe_ib.oem_product_name_ptr)
		return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
			(&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
	else
		return 0;
}

static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);

static ssize_t uvesafb_show_product_rev(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
	struct uvesafb_par *par = info->par;

	if (par->vbe_ib.oem_product_rev_ptr)
		return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
			(&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
	else
		return 0;
}

static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);

static ssize_t uvesafb_show_oem_string(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
	struct uvesafb_par *par = info->par;

	if (par->vbe_ib.oem_string_ptr)
		return snprintf(buf, PAGE_SIZE, "%s\n",
			(char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
	else
		return 0;
}

static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);

static ssize_t uvesafb_show_nocrtc(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
	struct uvesafb_par *par = info->par;

	return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
}

static ssize_t uvesafb_store_nocrtc(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
	struct uvesafb_par *par = info->par;

	if (count > 0) {
		if (buf[0] == '0')
			par->nocrtc = 0;
		else
			par->nocrtc = 1;
	}
	return count;
}

static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
			uvesafb_store_nocrtc);

static struct attribute *uvesafb_dev_attrs[] = {
	&dev_attr_vbe_version.attr,
	&dev_attr_vbe_modes.attr,
	&dev_attr_oem_vendor.attr,
	&dev_attr_oem_product_name.attr,
	&dev_attr_oem_product_rev.attr,
	&dev_attr_oem_string.attr,
	&dev_attr_nocrtc.attr,
	NULL,
};

static struct attribute_group uvesafb_dev_attgrp = {
	.name = NULL,
	.attrs = uvesafb_dev_attrs,
};

static int __devinit uvesafb_probe(struct platform_device *dev)
{
	struct fb_info *info;
	struct vbe_mode_ib *mode = NULL;
	struct uvesafb_par *par;
	int err = 0, i;

	info = framebuffer_alloc(sizeof(*par) +	sizeof(u32) * 256, &dev->dev);
	if (!info)
		return -ENOMEM;

	par = info->par;

	err = uvesafb_vbe_init(info);
	if (err) {
		printk(KERN_ERR "uvesafb: vbe_init() failed with %d\n", err);
		goto out;
	}

	info->fbops = &uvesafb_ops;

	i = uvesafb_vbe_init_mode(info);
	if (i < 0) {
		err = -EINVAL;
		goto out;
	} else {
		mode = &par->vbe_modes[i];
	}

	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
		err = -ENXIO;
		goto out;
	}

	uvesafb_init_info(info, mode);

	if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
				"uvesafb")) {
		printk(KERN_ERR "uvesafb: cannot reserve video memory at "
				"0x%lx\n", info->fix.smem_start);
		err = -EIO;
		goto out_mode;
	}

	info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);

	if (!info->screen_base) {
		printk(KERN_ERR
			"uvesafb: abort, cannot ioremap 0x%x bytes of video "
			"memory at 0x%lx\n",
			info->fix.smem_len, info->fix.smem_start);
		err = -EIO;
		goto out_mem;
	}

	if (!request_region(0x3c0, 32, "uvesafb")) {
		printk(KERN_ERR "uvesafb: request region 0x3c0-0x3e0 failed\n");
		err = -EIO;
		goto out_unmap;
	}

	uvesafb_init_mtrr(info);
	platform_set_drvdata(dev, info);

	if (register_framebuffer(info) < 0) {
		printk(KERN_ERR
			"uvesafb: failed to register framebuffer device\n");
		err = -EINVAL;
		goto out_reg;
	}

	printk(KERN_INFO "uvesafb: framebuffer at 0x%lx, mapped to 0x%p, "
			"using %dk, total %dk\n", info->fix.smem_start,
			info->screen_base, info->fix.smem_len/1024,
			par->vbe_ib.total_memory * 64);
	printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
			info->fix.id);

	err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
	if (err != 0)
		printk(KERN_WARNING "fb%d: failed to register attributes\n",
			info->node);

	return 0;

out_reg:
	release_region(0x3c0, 32);
out_unmap:
	iounmap(info->screen_base);
out_mem:
	release_mem_region(info->fix.smem_start, info->fix.smem_len);
out_mode:
	if (!list_empty(&info->modelist))
		fb_destroy_modelist(&info->modelist);
	fb_destroy_modedb(info->monspecs.modedb);
	fb_dealloc_cmap(&info->cmap);
out:
	if (par->vbe_modes)
		kfree(par->vbe_modes);

	framebuffer_release(info);
	return err;
}

static int uvesafb_remove(struct platform_device *dev)
{
	struct fb_info *info = platform_get_drvdata(dev);

	if (info) {
		struct uvesafb_par *par = info->par;

		sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
		unregister_framebuffer(info);
		release_region(0x3c0, 32);
		iounmap(info->screen_base);
		release_mem_region(info->fix.smem_start, info->fix.smem_len);
		fb_destroy_modedb(info->monspecs.modedb);
		fb_dealloc_cmap(&info->cmap);

		if (par) {
			if (par->vbe_modes)
				kfree(par->vbe_modes);
			if (par->vbe_state_orig)
				kfree(par->vbe_state_orig);
			if (par->vbe_state_saved)
				kfree(par->vbe_state_saved);
		}

		framebuffer_release(info);
	}
	return 0;
}

static struct platform_driver uvesafb_driver = {
	.probe  = uvesafb_probe,
	.remove = uvesafb_remove,
	.driver = {
		.name = "uvesafb",
	},
};

static struct platform_device *uvesafb_device;

#ifndef MODULE
static int __devinit uvesafb_setup(char *options)
{
	char *this_opt;

	if (!options || !*options)
		return 0;

	while ((this_opt = strsep(&options, ",")) != NULL) {
		if (!*this_opt) continue;

		if (!strcmp(this_opt, "redraw"))
			ypan = 0;
		else if (!strcmp(this_opt, "ypan"))
			ypan = 1;
		else if (!strcmp(this_opt, "ywrap"))
			ypan = 2;
		else if (!strcmp(this_opt, "vgapal"))
			pmi_setpal = 0;
		else if (!strcmp(this_opt, "pmipal"))
			pmi_setpal = 1;
		else if (!strncmp(this_opt, "mtrr:", 5))
			mtrr = simple_strtoul(this_opt+5, NULL, 0);
		else if (!strcmp(this_opt, "nomtrr"))
			mtrr = 0;
		else if (!strcmp(this_opt, "nocrtc"))
			nocrtc = 1;
		else if (!strcmp(this_opt, "noedid"))
			noedid = 1;
		else if (!strcmp(this_opt, "noblank"))
			blank = 0;
		else if (!strncmp(this_opt, "vtotal:", 7))
			vram_total = simple_strtoul(this_opt + 7, NULL, 0);
		else if (!strncmp(this_opt, "vremap:", 7))
			vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
		else if (!strncmp(this_opt, "maxhf:", 6))
			maxhf = simple_strtoul(this_opt + 6, NULL, 0);
		else if (!strncmp(this_opt, "maxvf:", 6))
			maxvf = simple_strtoul(this_opt + 6, NULL, 0);
		else if (!strncmp(this_opt, "maxclk:", 7))
			maxclk = simple_strtoul(this_opt + 7, NULL, 0);
		else if (!strncmp(this_opt, "vbemode:", 8))
			vbemode = simple_strtoul(this_opt + 8, NULL, 0);
		else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
			mode_option = this_opt;
		} else {
			printk(KERN_WARNING
				"uvesafb: unrecognized option %s\n", this_opt);
		}
	}

	return 0;
}
#endif /* !MODULE */

static ssize_t show_v86d(struct device_driver *dev, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
}

static ssize_t store_v86d(struct device_driver *dev, const char *buf,
		size_t count)
{
	strncpy(v86d_path, buf, PATH_MAX);
	return count;
}

static DRIVER_ATTR(v86d, S_IRUGO | S_IWUSR, show_v86d, store_v86d);

static int __devinit uvesafb_init(void)
{
	int err;

#ifndef MODULE
	char *option = NULL;

	if (fb_get_options("uvesafb", &option))
		return -ENODEV;
	uvesafb_setup(option);
#endif
	err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
	if (err)
		return err;

	err = platform_driver_register(&uvesafb_driver);

	if (!err) {
		uvesafb_device = platform_device_alloc("uvesafb", 0);
		if (uvesafb_device)
			err = platform_device_add(uvesafb_device);
		else
			err = -ENOMEM;

		if (err) {
			platform_device_put(uvesafb_device);
			platform_driver_unregister(&uvesafb_driver);
			cn_del_callback(&uvesafb_cn_id);
			return err;
		}

		err = driver_create_file(&uvesafb_driver.driver,
				&driver_attr_v86d);
		if (err) {
			printk(KERN_WARNING "uvesafb: failed to register "
					"attributes\n");
			err = 0;
		}
	}
	return err;
}

module_init(uvesafb_init);

static void __devexit uvesafb_exit(void)
{
	struct uvesafb_ktask *task;

	if (v86d_started) {
		task = uvesafb_prep();
		if (task) {
			task->t.flags = TF_EXIT;
			uvesafb_exec(task);
			uvesafb_free(task);
		}
	}

	cn_del_callback(&uvesafb_cn_id);
	driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
	platform_device_unregister(uvesafb_device);
	platform_driver_unregister(&uvesafb_driver);
}

module_exit(uvesafb_exit);

static int param_get_scroll(char *buffer, struct kernel_param *kp)
{
	return 0;
}

static int param_set_scroll(const char *val, struct kernel_param *kp)
{
	ypan = 0;

	if (!strcmp(val, "redraw"))
		ypan = 0;
	else if (!strcmp(val, "ypan"))
		ypan = 1;
	else if (!strcmp(val, "ywrap"))
		ypan = 2;

	return 0;
}

#define param_check_scroll(name, p) __param_check(name, p, void)

module_param_named(scroll, ypan, scroll, 0);
MODULE_PARM_DESC(scroll,
	"Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
module_param_named(vgapal, pmi_setpal, invbool, 0);
MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
module_param_named(pmipal, pmi_setpal, bool, 0);
MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
module_param(mtrr, uint, 0);
MODULE_PARM_DESC(mtrr,
	"Memory Type Range Registers setting. Use 0 to disable.");
module_param(blank, bool, 0);
MODULE_PARM_DESC(blank, "Enable hardware blanking");
module_param(nocrtc, bool, 0);
MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
module_param(noedid, bool, 0);
MODULE_PARM_DESC(noedid,
	"Ignore EDID-provided monitor limits when setting modes");
module_param(vram_remap, uint, 0);
MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
module_param(vram_total, uint, 0);
MODULE_PARM_DESC(vram_total, "Set total amount of video memoery [MiB]");
module_param(maxclk, ushort, 0);
MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
module_param(maxhf, ushort, 0);
MODULE_PARM_DESC(maxhf,
	"Maximum horizontal frequency [kHz], overrides EDID data");
module_param(maxvf, ushort, 0);
MODULE_PARM_DESC(maxvf,
	"Maximum vertical frequency [Hz], overrides EDID data");
module_param_named(mode, mode_option, charp, 0);
MODULE_PARM_DESC(mode,
	"Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
module_param(vbemode, ushort, 0);
MODULE_PARM_DESC(vbemode,
	"VBE mode number to set, overrides the 'mode' option");
module_param_string(v86d, v86d_path, PATH_MAX, 0660);
MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");