This source file includes following definitions.
- CMOS_READ
- read_timer
- hd_setup
- dump_status
- check_status
- controller_busy
- status_ok
- controller_ready
- hd_out
- fixstring
- identify_intr
- set_multmode_intr
- drive_busy
- reset_controller
- reset_hd
- unexpected_hd_interrupt
- bad_rw_intr
- wait_DRQ
- read_intr
- multwrite
- multwrite_intr
- write_intr
- recal_intr
- hd_times_out
- do_special_op
- hd_request
- do_hd_request
- hd_ioctl
- hd_open
- hd_release
- hd_interrupt
- hd_geninit
- hd_init
- revalidate_hddisk
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21
22 #define DEFAULT_MULT_COUNT 0
23 #define DEFAULT_UNMASK_INTR 0
24
25 #include <asm/irq.h>
26 #include <linux/errno.h>
27 #include <linux/signal.h>
28 #include <linux/sched.h>
29 #include <linux/timer.h>
30 #include <linux/fs.h>
31 #include <linux/kernel.h>
32 #include <linux/hdreg.h>
33 #include <linux/genhd.h>
34 #include <linux/config.h>
35 #include <linux/malloc.h>
36 #include <linux/string.h>
37
38 #define REALLY_SLOW_IO
39 #include <asm/system.h>
40 #include <asm/io.h>
41 #include <asm/segment.h>
42
43 #define MAJOR_NR HD_MAJOR
44 #include "blk.h"
45
46 #define HD_IRQ 14
47
48 static int revalidate_hddisk(int, int);
49
50 static inline unsigned char CMOS_READ(unsigned char addr)
51 {
52 outb_p(addr,0x70);
53 return inb_p(0x71);
54 }
55
56 #define HD_DELAY 0
57
58 #define MAX_ERRORS 16
59 #define RESET_FREQ 8
60 #define RECAL_FREQ 4
61 #define MAX_HD 2
62
63 #define STAT_OK (READY_STAT|SEEK_STAT)
64 #define OK_STATUS(s) (((s)&(STAT_OK|(BUSY_STAT|WRERR_STAT|ERR_STAT)))==STAT_OK)
65
66 static void recal_intr(void);
67 static void bad_rw_intr(void);
68
69 static char recalibrate[MAX_HD] = { 0, };
70 static char special_op[MAX_HD] = { 0, };
71 static int access_count[MAX_HD] = {0, };
72 static char busy[MAX_HD] = {0, };
73 static struct wait_queue * busy_wait = NULL;
74
75 static int reset = 0;
76 static int hd_error = 0;
77
78
79
80
81 struct hd_i_struct {
82 unsigned int head,sect,cyl,wpcom,lzone,ctl;
83 };
84 static struct hd_driveid *hd_ident_info[MAX_HD] = {0, };
85
86 #ifdef HD_TYPE
87 static struct hd_i_struct hd_info[] = { HD_TYPE };
88 struct hd_i_struct bios_info[] = { HD_TYPE };
89 static int NR_HD = ((sizeof (hd_info))/(sizeof (struct hd_i_struct)));
90 #else
91 static struct hd_i_struct hd_info[] = { {0,0,0,0,0,0},{0,0,0,0,0,0} };
92 struct hd_i_struct bios_info[] = { {0,0,0,0,0,0},{0,0,0,0,0,0} };
93 static int NR_HD = 0;
94 #endif
95
96 static struct hd_struct hd[MAX_HD<<6]={{0,0},};
97 static int hd_sizes[MAX_HD<<6] = {0, };
98 static int hd_blocksizes[MAX_HD<<6] = {0, };
99
100 #if (HD_DELAY > 0)
101 unsigned long last_req;
102
103 unsigned long read_timer(void)
104 {
105 unsigned long t, flags;
106 int i;
107
108 save_flags(flags);
109 cli();
110 t = jiffies * 11932;
111 outb_p(0, 0x43);
112 i = inb_p(0x40);
113 i |= inb(0x40) << 8;
114 restore_flags(flags);
115 return(t - i);
116 }
117 #endif
118
119 void hd_setup(char *str, int *ints)
120 {
121 int hdind = 0;
122
123 if (ints[0] != 3)
124 return;
125 if (bios_info[0].head != 0)
126 hdind=1;
127 bios_info[hdind].head = hd_info[hdind].head = ints[2];
128 bios_info[hdind].sect = hd_info[hdind].sect = ints[3];
129 bios_info[hdind].cyl = hd_info[hdind].cyl = ints[1];
130 bios_info[hdind].wpcom = hd_info[hdind].wpcom = 0;
131 bios_info[hdind].lzone = hd_info[hdind].lzone = ints[1];
132 bios_info[hdind].ctl = hd_info[hdind].ctl = (ints[2] > 8 ? 8 : 0);
133 NR_HD = hdind+1;
134 }
135
136 static void dump_status (char *msg, unsigned int stat)
137 {
138 unsigned long flags;
139 char devc;
140
141 devc = CURRENT ? 'a' + DEVICE_NR(CURRENT->dev) : '?';
142 save_flags (flags);
143 sti();
144 printk("hd%c: %s: status=0x%02x { ", devc, msg, stat & 0xff);
145 if (stat & BUSY_STAT) printk("Busy ");
146 if (stat & READY_STAT) printk("DriveReady ");
147 if (stat & WRERR_STAT) printk("WriteFault ");
148 if (stat & SEEK_STAT) printk("SeekComplete ");
149 if (stat & DRQ_STAT) printk("DataRequest ");
150 if (stat & ECC_STAT) printk("CorrectedError ");
151 if (stat & INDEX_STAT) printk("Index ");
152 if (stat & ERR_STAT) printk("Error ");
153 printk("}\n");
154 if ((stat & ERR_STAT) == 0) {
155 hd_error = 0;
156 } else {
157 hd_error = inb(HD_ERROR);
158 printk("hd%c: %s: error=0x%02x { ", devc, msg, hd_error & 0xff);
159 if (hd_error & BBD_ERR) printk("BadSector ");
160 if (hd_error & ECC_ERR) printk("UncorrectableError ");
161 if (hd_error & ID_ERR) printk("SectorIdNotFound ");
162 if (hd_error & ABRT_ERR) printk("DriveStatusError ");
163 if (hd_error & TRK0_ERR) printk("TrackZeroNotFound ");
164 if (hd_error & MARK_ERR) printk("AddrMarkNotFound ");
165 printk("}");
166 if (hd_error & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) {
167 printk(", CHS=%d/%d/%d", (inb(HD_HCYL)<<8) + inb(HD_LCYL),
168 inb(HD_CURRENT) & 0xf, inb(HD_SECTOR));
169 if (CURRENT)
170 printk(", sector=%ld", CURRENT->sector);
171 }
172 printk("\n");
173 }
174 restore_flags (flags);
175 }
176
177 void check_status(void)
178 {
179 int i = inb_p(HD_STATUS);
180
181 if (!OK_STATUS(i)) {
182 dump_status("check_status", i);
183 bad_rw_intr();
184 }
185 }
186
187 static int controller_busy(void)
188 {
189 int retries = 100000;
190 unsigned char status;
191
192 do {
193 status = inb_p(HD_STATUS);
194 } while ((status & BUSY_STAT) && --retries);
195 return status;
196 }
197
198 static int status_ok(void)
199 {
200 unsigned char status = inb_p(HD_STATUS);
201
202 if (status & BUSY_STAT)
203 return 1;
204 if (status & WRERR_STAT)
205 return 0;
206 if (!(status & READY_STAT))
207 return 0;
208 if (!(status & SEEK_STAT))
209 return 0;
210 return 1;
211 }
212
213 static int controller_ready(unsigned int drive, unsigned int head)
214 {
215 int retry = 100;
216
217 do {
218 if (controller_busy() & BUSY_STAT)
219 return 0;
220 outb_p(0xA0 | (drive<<4) | head, HD_CURRENT);
221 if (status_ok())
222 return 1;
223 } while (--retry);
224 return 0;
225 }
226
227 static void hd_out(unsigned int drive,unsigned int nsect,unsigned int sect,
228 unsigned int head,unsigned int cyl,unsigned int cmd,
229 void (*intr_addr)(void))
230 {
231 unsigned short port;
232
233 #if (HD_DELAY > 0)
234 while (read_timer() - last_req < HD_DELAY)
235 ;
236 #endif
237 if (reset)
238 return;
239 if (!controller_ready(drive, head)) {
240 reset = 1;
241 return;
242 }
243 SET_INTR(intr_addr);
244 outb_p(hd_info[drive].ctl,HD_CMD);
245 port=HD_DATA;
246 outb_p(hd_info[drive].wpcom>>2,++port);
247 outb_p(nsect,++port);
248 outb_p(sect,++port);
249 outb_p(cyl,++port);
250 outb_p(cyl>>8,++port);
251 outb_p(0xA0|(drive<<4)|head,++port);
252 outb_p(cmd,++port);
253 }
254
255 static void hd_request (void);
256 static unsigned int identified [MAX_HD] = {0,};
257 static unsigned int unmask_intr [MAX_HD] = {0,};
258 static unsigned int max_mult [MAX_HD] = {0,};
259 static unsigned int mult_req [MAX_HD] = {0,};
260 static unsigned int mult_count [MAX_HD] = {0,};
261 static struct request WCURRENT;
262
263 static void fixstring(unsigned char *s, int n)
264 {
265 int i;
266 unsigned short *ss = (unsigned short *) s;
267
268
269 for (i = n ; (i -= 2) >= 0 ; ss++)
270 *ss = (*ss >> 8) | (*ss << 8);
271
272
273 for (i = 0 ; i < n ; i++) {
274 if (!s[i]) {
275 n = i;
276 break;
277 }
278 }
279
280
281 while (n > 0) {
282 if (s[n-1] != ' ')
283 break;
284 n--;
285 s[n] = '\0';
286 }
287
288
289 if (*s == ' ') {
290 unsigned char *t = s;
291 while (n-- && *++s == ' ');
292 while (n-- >= 0) {
293 *t++ = *s;
294 *s++ = '\0';
295 }
296 }
297 }
298
299 static void identify_intr(void)
300 {
301 unsigned int dev = DEVICE_NR(CURRENT->dev);
302 unsigned short stat = inb_p(HD_STATUS);
303 struct hd_driveid *id = hd_ident_info[dev];
304
305 if (unmask_intr[dev])
306 sti();
307 if (stat & (BUSY_STAT|ERR_STAT)) {
308 printk (" hd%c: non-IDE device, CHS=%d/%d/%d\n", dev+'a',
309 hd_info[dev].cyl, hd_info[dev].head, hd_info[dev].sect);
310 if (id != NULL) {
311 hd_ident_info[dev] = NULL;
312 kfree_s (id, 512);
313 }
314 } else {
315 insw(HD_DATA, id, 256);
316 max_mult[dev] = id->max_multsect;
317 if ((id->field_valid&1) && id->cur_cyls && id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
318
319
320
321
322
323
324
325 hd_info[dev].cyl = id->cur_cyls;
326 hd_info[dev].head = id->cur_heads;
327 hd_info[dev].sect = id->cur_sectors;
328 }
329 fixstring (id->serial_no, sizeof(id->serial_no));
330 fixstring (id->fw_rev, sizeof(id->fw_rev));
331 fixstring (id->model, sizeof(id->model));
332 printk (" hd%c: %.40s, %dMB w/%dKB Cache, CHS=%d/%d/%d, MaxMult=%d\n",
333 dev+'a', id->model, id->cyls*id->heads*id->sectors/2048,
334 id->buf_size/2, hd_info[dev].cyl, hd_info[dev].head,
335 hd_info[dev].sect, id->max_multsect);
336
337
338
339
340
341 if (!strncmp(id->model, "QUANTUM", 7))
342 special_op[dev] = recalibrate[dev] = 1;
343 }
344 #if (HD_DELAY > 0)
345 last_req = read_timer();
346 #endif
347 hd_request();
348 return;
349 }
350
351 static void set_multmode_intr(void)
352 {
353 unsigned int dev = DEVICE_NR(CURRENT->dev), stat = inb_p(HD_STATUS);
354
355 if (unmask_intr[dev])
356 sti();
357 if (stat & (BUSY_STAT|ERR_STAT)) {
358 mult_req[dev] = mult_count[dev] = 0;
359 dump_status("set multmode failed", stat);
360 } else {
361 if ((mult_count[dev] = mult_req[dev]))
362 printk (" hd%c: enabled %d-sector multiple mode\n",
363 dev+'a', mult_count[dev]);
364 else
365 printk (" hd%c: disabled multiple mode\n", dev+'a');
366 }
367 #if (HD_DELAY > 0)
368 last_req = read_timer();
369 #endif
370 hd_request();
371 return;
372 }
373
374 static int drive_busy(void)
375 {
376 unsigned int i;
377 unsigned char c;
378
379 for (i = 0; i < 500000 ; i++) {
380 c = inb_p(HD_STATUS);
381 if ((c & (BUSY_STAT | READY_STAT | SEEK_STAT)) == STAT_OK)
382 return 0;
383 }
384 dump_status("reset timed out", c);
385 return 1;
386 }
387
388 static void reset_controller(void)
389 {
390 int i;
391
392 outb_p(4,HD_CMD);
393 for(i = 0; i < 1000; i++) nop();
394 outb_p(hd_info[0].ctl & 0x0f,HD_CMD);
395 for(i = 0; i < 1000; i++) nop();
396 if (drive_busy())
397 printk("hd: controller still busy\n");
398 else if ((hd_error = inb(HD_ERROR)) != 1)
399 printk("hd: controller reset failed: %02x\n",hd_error);
400 }
401
402 static void reset_hd(void)
403 {
404 static int i;
405
406 repeat:
407 if (reset) {
408 reset = 0;
409 i = -1;
410 reset_controller();
411 } else {
412 check_status();
413 if (reset)
414 goto repeat;
415 }
416 if (++i < NR_HD) {
417 special_op[i] = recalibrate[i] = 1;
418 if (unmask_intr[i]) {
419 unmask_intr[i] = DEFAULT_UNMASK_INTR;
420 printk("hd%c: reset irq-unmasking to %d\n",i+'a',
421 DEFAULT_UNMASK_INTR);
422 }
423 if (mult_req[i] || mult_count[i]) {
424 mult_count[i] = 0;
425 mult_req[i] = DEFAULT_MULT_COUNT;
426 printk("hd%c: reset multiple mode to %d\n",i+'a',
427 DEFAULT_MULT_COUNT);
428 }
429 hd_out(i,hd_info[i].sect,hd_info[i].sect,hd_info[i].head-1,
430 hd_info[i].cyl,WIN_SPECIFY,&reset_hd);
431 if (reset)
432 goto repeat;
433 } else
434 hd_request();
435 }
436
437
438
439
440
441
442
443
444
445
446 void unexpected_hd_interrupt(void)
447 {
448 unsigned int stat = inb_p(HD_STATUS);
449
450 if (stat & (BUSY_STAT|DRQ_STAT|ECC_STAT|ERR_STAT)) {
451 dump_status ("unexpected interrupt", stat);
452 SET_TIMER;
453 }
454 }
455
456
457
458
459
460
461 static void bad_rw_intr(void)
462 {
463 int dev;
464
465 if (!CURRENT)
466 return;
467 dev = DEVICE_NR(CURRENT->dev);
468 if (++CURRENT->errors >= MAX_ERRORS || (hd_error & BBD_ERR)) {
469 end_request(0);
470 special_op[dev] = recalibrate[dev] = 1;
471 } else if (CURRENT->errors % RESET_FREQ == 0)
472 reset = 1;
473 else if ((hd_error & TRK0_ERR) || CURRENT->errors % RECAL_FREQ == 0)
474 special_op[dev] = recalibrate[dev] = 1;
475
476 }
477
478 static inline int wait_DRQ(void)
479 {
480 int retries = 100000, stat;
481
482 while (--retries > 0)
483 if ((stat = inb_p(HD_STATUS)) & DRQ_STAT)
484 return 0;
485 dump_status("wait_DRQ", stat);
486 return -1;
487 }
488
489 static void read_intr(void)
490 {
491 unsigned int dev = DEVICE_NR(CURRENT->dev);
492 int i, retries = 100000, msect = mult_count[dev], nsect;
493
494 if (unmask_intr[dev])
495 sti();
496 do {
497 i = (unsigned) inb_p(HD_STATUS);
498 if (i & BUSY_STAT)
499 continue;
500 if (!OK_STATUS(i))
501 break;
502 if (i & DRQ_STAT)
503 goto ok_to_read;
504 } while (--retries > 0);
505 dump_status("read_intr", i);
506 bad_rw_intr();
507 hd_request();
508 return;
509 ok_to_read:
510 if (msect) {
511 if ((nsect = CURRENT->current_nr_sectors) > msect)
512 nsect = msect;
513 msect -= nsect;
514 } else
515 nsect = 1;
516 insw(HD_DATA,CURRENT->buffer,nsect<<8);
517 CURRENT->sector += nsect;
518 CURRENT->buffer += nsect<<9;
519 CURRENT->errors = 0;
520 i = (CURRENT->nr_sectors -= nsect);
521
522 #ifdef DEBUG
523 printk("hd%c: read: sectors(%ld-%ld), remaining=%ld, buffer=0x%08lx\n",
524 dev+'a', CURRENT->sector, CURRENT->sector+nsect,
525 CURRENT->nr_sectors, (unsigned long) CURRENT->buffer+(nsect<<9));
526 #endif
527 if ((CURRENT->current_nr_sectors -= nsect) <= 0)
528 end_request(1);
529 if (i > 0) {
530 if (msect)
531 goto ok_to_read;
532 SET_INTR(&read_intr);
533 return;
534 }
535 (void) inb_p(HD_STATUS);
536 #if (HD_DELAY > 0)
537 last_req = read_timer();
538 #endif
539 if (CURRENT)
540 hd_request();
541 return;
542 }
543
544 static inline void multwrite (unsigned int dev)
545 {
546 unsigned int mcount = mult_count[dev];
547
548 while (mcount--) {
549 outsw(HD_DATA,WCURRENT.buffer,256);
550 if (!--WCURRENT.nr_sectors)
551 return;
552 WCURRENT.buffer += 512;
553 if (!--WCURRENT.current_nr_sectors) {
554 WCURRENT.bh = WCURRENT.bh->b_reqnext;
555 if (WCURRENT.bh == NULL)
556 panic("buffer list corrupted\n");
557 WCURRENT.current_nr_sectors = WCURRENT.bh->b_size>>9;
558 WCURRENT.buffer = WCURRENT.bh->b_data;
559 }
560 }
561 }
562
563 static void multwrite_intr(void)
564 {
565 int i;
566 unsigned int dev = DEVICE_NR(WCURRENT.dev);
567
568 if (unmask_intr[dev])
569 sti();
570 if (OK_STATUS(i=inb_p(HD_STATUS))) {
571 if (i & DRQ_STAT) {
572 if (WCURRENT.nr_sectors) {
573 multwrite(dev);
574 SET_INTR(&multwrite_intr);
575 return;
576 }
577 } else {
578 if (!WCURRENT.nr_sectors) {
579 for (i = CURRENT->nr_sectors; i > 0;){
580 i -= CURRENT->current_nr_sectors;
581 end_request(1);
582 }
583 #if (HD_DELAY > 0)
584 last_req = read_timer();
585 #endif
586 if (CURRENT)
587 hd_request();
588 return;
589 }
590 }
591 }
592 dump_status("multwrite_intr", i);
593 bad_rw_intr();
594 hd_request();
595 }
596
597 static void write_intr(void)
598 {
599 int i;
600 int retries = 100000;
601
602 if (unmask_intr[DEVICE_NR(WCURRENT.dev)])
603 sti();
604 do {
605 i = (unsigned) inb_p(HD_STATUS);
606 if (i & BUSY_STAT)
607 continue;
608 if (!OK_STATUS(i))
609 break;
610 if ((CURRENT->nr_sectors <= 1) || (i & DRQ_STAT))
611 goto ok_to_write;
612 } while (--retries > 0);
613 dump_status("write_intr", i);
614 bad_rw_intr();
615 hd_request();
616 return;
617 ok_to_write:
618 CURRENT->sector++;
619 i = --CURRENT->nr_sectors;
620 --CURRENT->current_nr_sectors;
621 CURRENT->buffer += 512;
622 if (!i || (CURRENT->bh && !SUBSECTOR(i)))
623 end_request(1);
624 if (i > 0) {
625 SET_INTR(&write_intr);
626 outsw(HD_DATA,CURRENT->buffer,256);
627 sti();
628 } else {
629 #if (HD_DELAY > 0)
630 last_req = read_timer();
631 #endif
632 hd_request();
633 }
634 return;
635 }
636
637 static void recal_intr(void)
638 {
639 check_status();
640 #if (HD_DELAY > 0)
641 last_req = read_timer();
642 #endif
643 hd_request();
644 }
645
646
647
648
649
650 static void hd_times_out(void)
651 {
652 unsigned int dev;
653
654 DEVICE_INTR = NULL;
655 if (!CURRENT)
656 return;
657 disable_irq(HD_IRQ);
658 sti();
659 reset = 1;
660 dev = DEVICE_NR(CURRENT->dev);
661 printk("hd%c: timeout\n", dev+'a');
662 if (++CURRENT->errors >= MAX_ERRORS) {
663 #ifdef DEBUG
664 printk("hd%c: too many errors\n", dev+'a');
665 #endif
666 end_request(0);
667 }
668 cli();
669 hd_request();
670 enable_irq(HD_IRQ);
671 }
672
673 int do_special_op (unsigned int dev)
674 {
675 if (recalibrate[dev]) {
676 recalibrate[dev] = 0;
677 hd_out(dev,hd_info[dev].sect,0,0,0,WIN_RESTORE,&recal_intr);
678 return reset;
679 }
680 if (!identified[dev]) {
681 identified[dev] = 1;
682 unmask_intr[dev] = DEFAULT_UNMASK_INTR;
683 mult_req[dev] = DEFAULT_MULT_COUNT;
684 hd_out(dev,0,0,0,0,WIN_IDENTIFY,&identify_intr);
685 return reset;
686 }
687 if (mult_req[dev] != mult_count[dev]) {
688 hd_out(dev,mult_req[dev],0,0,0,WIN_SETMULT,&set_multmode_intr);
689 return reset;
690 }
691 if (hd_info[dev].head > 16) {
692 printk ("hd%c: cannot handle device with more than 16 heads - giving up\n", dev+'a');
693 end_request(0);
694 }
695 special_op[dev] = 0;
696 return 1;
697 }
698
699
700
701
702
703
704
705
706
707
708
709
710
711 static void hd_request(void)
712 {
713 unsigned int dev, block, nsect, sec, track, head, cyl;
714
715 if (CURRENT && CURRENT->dev < 0) return;
716 if (DEVICE_INTR)
717 return;
718 repeat:
719 timer_active &= ~(1<<HD_TIMER);
720 sti();
721 INIT_REQUEST;
722 if (reset) {
723 cli();
724 reset_hd();
725 return;
726 }
727 dev = MINOR(CURRENT->dev);
728 block = CURRENT->sector;
729 nsect = CURRENT->nr_sectors;
730 if (dev >= (NR_HD<<6) || block >= hd[dev].nr_sects || ((block+nsect) > hd[dev].nr_sects)) {
731 #ifdef DEBUG
732 if (dev >= (NR_HD<<6))
733 printk("hd: bad minor number: device=0x%04x\n", CURRENT->dev);
734 else
735 printk("hd%c: bad access: block=%d, count=%d\n",
736 (CURRENT->dev>>6)+'a', block, nsect);
737 #endif
738 end_request(0);
739 goto repeat;
740 }
741 block += hd[dev].start_sect;
742 dev >>= 6;
743 if (special_op[dev]) {
744 if (do_special_op(dev))
745 goto repeat;
746 return;
747 }
748 sec = block % hd_info[dev].sect + 1;
749 track = block / hd_info[dev].sect;
750 head = track % hd_info[dev].head;
751 cyl = track / hd_info[dev].head;
752 #ifdef DEBUG
753 printk("hd%c: %sing: CHS=%d/%d/%d, sectors=%d, buffer=0x%08lx\n",
754 dev+'a', (CURRENT->cmd == READ)?"read":"writ",
755 cyl, head, sec, nsect, (unsigned long) CURRENT->buffer);
756 #endif
757 if (!unmask_intr[dev])
758 cli();
759 if (CURRENT->cmd == READ) {
760 unsigned int cmd = mult_count[dev] > 1 ? WIN_MULTREAD : WIN_READ;
761 hd_out(dev,nsect,sec,head,cyl,cmd,&read_intr);
762 if (reset)
763 goto repeat;
764 return;
765 }
766 if (CURRENT->cmd == WRITE) {
767 if (mult_count[dev])
768 hd_out(dev,nsect,sec,head,cyl,WIN_MULTWRITE,&multwrite_intr);
769 else
770 hd_out(dev,nsect,sec,head,cyl,WIN_WRITE,&write_intr);
771 if (reset)
772 goto repeat;
773 if (wait_DRQ()) {
774 bad_rw_intr();
775 goto repeat;
776 }
777 if (mult_count[dev]) {
778 WCURRENT = *CURRENT;
779 multwrite(dev);
780 } else
781 outsw(HD_DATA,CURRENT->buffer,256);
782 return;
783 }
784 panic("unknown hd-command");
785 }
786
787 static void do_hd_request (void)
788 {
789 disable_irq(HD_IRQ);
790 hd_request();
791 enable_irq(HD_IRQ);
792 }
793
794 static int hd_ioctl(struct inode * inode, struct file * file,
795 unsigned int cmd, unsigned long arg)
796 {
797 struct hd_geometry *loc = (struct hd_geometry *) arg;
798 int dev, err;
799
800 if ((!inode) || (!inode->i_rdev))
801 return -EINVAL;
802 dev = DEVICE_NR(inode->i_rdev);
803 if (dev >= NR_HD)
804 return -EINVAL;
805 switch (cmd) {
806 case HDIO_GETGEO:
807 if (!loc) return -EINVAL;
808 err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
809 if (err)
810 return err;
811 put_fs_byte(bios_info[dev].head,
812 (char *) &loc->heads);
813 put_fs_byte(bios_info[dev].sect,
814 (char *) &loc->sectors);
815 put_fs_word(bios_info[dev].cyl,
816 (short *) &loc->cylinders);
817 put_fs_long(hd[MINOR(inode->i_rdev)].start_sect,
818 (long *) &loc->start);
819 return 0;
820 case BLKRASET:
821 if(!suser()) return -EACCES;
822 if(arg > 0xff) return -EINVAL;
823 read_ahead[MAJOR(inode->i_rdev)] = arg;
824 return 0;
825 case BLKRAGET:
826 if (!arg) return -EINVAL;
827 err = verify_area(VERIFY_WRITE, (long *) arg, sizeof(long));
828 if (err)
829 return err;
830 put_fs_long(read_ahead[MAJOR(inode->i_rdev)],(long *) arg);
831 return 0;
832 case BLKGETSIZE:
833 if (!arg) return -EINVAL;
834 err = verify_area(VERIFY_WRITE, (long *) arg, sizeof(long));
835 if (err)
836 return err;
837 put_fs_long(hd[MINOR(inode->i_rdev)].nr_sects, (long *) arg);
838 return 0;
839 case BLKFLSBUF:
840 if(!suser()) return -EACCES;
841 fsync_dev(inode->i_rdev);
842 invalidate_buffers(inode->i_rdev);
843 return 0;
844
845 case BLKRRPART:
846 return revalidate_hddisk(inode->i_rdev, 1);
847
848 case HDIO_SETUNMASKINTR:
849 if (!suser()) return -EACCES;
850 if (!arg) return -EINVAL;
851 if (MINOR(inode->i_rdev) & 0x3F) return -EINVAL;
852 err = verify_area(VERIFY_READ, (long *) arg, sizeof(long));
853 if (err)
854 return err;
855 unmask_intr[dev] = get_fs_long((long *) arg);
856 return 0;
857
858 case HDIO_GETUNMASKINTR:
859 if (!arg) return -EINVAL;
860 err = verify_area(VERIFY_WRITE, (long *) arg, sizeof(long));
861 if (err)
862 return err;
863 put_fs_long(unmask_intr[dev], (long *) arg);
864 return 0;
865
866 case HDIO_GETMULTCOUNT:
867 if (!arg) return -EINVAL;
868 err = verify_area(VERIFY_WRITE, (long *) arg, sizeof(long));
869 if (err)
870 return err;
871 put_fs_long(mult_count[dev], (long *) arg);
872 return 0;
873
874 case HDIO_SETMULTCOUNT:
875 {
876 unsigned long flags;
877 if (!suser()) return -EACCES;
878 if (!arg) return -EINVAL;
879 if (MINOR(inode->i_rdev) & 0x3F) return -EINVAL;
880 err = verify_area(VERIFY_READ, (long *) arg, sizeof(long));
881 if (err)
882 return err;
883 arg = get_fs_long((long *) arg);
884 save_flags(flags);
885 cli();
886 if (arg > max_mult[dev])
887 err = -EINVAL;
888 else if (mult_req[dev] != mult_count[dev]) {
889 special_op[dev] = 1;
890 err = -EBUSY;
891 } else {
892 mult_req[dev] = arg;
893 special_op[dev] = 1;
894 err = 0;
895 }
896 restore_flags(flags);
897 return err;
898 }
899 case HDIO_GETIDENTITY:
900 if (!arg) return -EINVAL;
901 if (MINOR(inode->i_rdev) & 0x3F) return -EINVAL;
902 if (hd_ident_info[dev] == NULL) return -ENOMSG;
903 err = verify_area(VERIFY_WRITE, (char *) arg, sizeof(struct hd_driveid));
904 if (err)
905 return err;
906 memcpy_tofs((char *)arg, (char *) hd_ident_info[dev], sizeof(struct hd_driveid));
907 return 0;
908
909 RO_IOCTLS(inode->i_rdev,arg);
910 default:
911 return -EINVAL;
912 }
913 }
914
915 static int hd_open(struct inode * inode, struct file * filp)
916 {
917 int target;
918 target = DEVICE_NR(inode->i_rdev);
919
920 while (busy[target])
921 sleep_on(&busy_wait);
922 access_count[target]++;
923 return 0;
924 }
925
926
927
928
929
930 static void hd_release(struct inode * inode, struct file * file)
931 {
932 int target;
933 sync_dev(inode->i_rdev);
934
935 target = DEVICE_NR(inode->i_rdev);
936 access_count[target]--;
937
938 }
939
940 static void hd_geninit(void);
941
942 static struct gendisk hd_gendisk = {
943 MAJOR_NR,
944 "hd",
945 6,
946 1 << 6,
947 MAX_HD,
948 hd_geninit,
949 hd,
950 hd_sizes,
951 0,
952 (void *) bios_info,
953 NULL
954 };
955
956 static void hd_interrupt(int unused)
957 {
958 void (*handler)(void) = DEVICE_INTR;
959
960 DEVICE_INTR = NULL;
961 timer_active &= ~(1<<HD_TIMER);
962 if (!handler)
963 handler = unexpected_hd_interrupt;
964 handler();
965 sti();
966 }
967
968
969
970
971
972
973
974
975
976
977 static void hd_geninit(void)
978 {
979 int drive, i;
980 extern struct drive_info drive_info;
981 unsigned char *BIOS = (unsigned char *) &drive_info;
982 int cmos_disks;
983
984 if (!NR_HD) {
985 for (drive=0 ; drive<2 ; drive++) {
986 bios_info[drive].cyl = hd_info[drive].cyl = *(unsigned short *) BIOS;
987 bios_info[drive].head = hd_info[drive].head = *(2+BIOS);
988 bios_info[drive].wpcom = hd_info[drive].wpcom = *(unsigned short *) (5+BIOS);
989 bios_info[drive].ctl = hd_info[drive].ctl = *(8+BIOS);
990 bios_info[drive].lzone = hd_info[drive].lzone = *(unsigned short *) (12+BIOS);
991 bios_info[drive].sect = hd_info[drive].sect = *(14+BIOS);
992 #ifdef does_not_work_for_everybody_with_scsi_but_helps_ibm_vp
993 if (hd_info[drive].cyl && NR_HD == drive)
994 NR_HD++;
995 #endif
996 BIOS += 16;
997 }
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021 if ((cmos_disks = CMOS_READ(0x12)) & 0xf0)
1022 if (cmos_disks & 0x0f)
1023 NR_HD = 2;
1024 else
1025 NR_HD = 1;
1026 }
1027 i = NR_HD;
1028 while (i-- > 0) {
1029
1030
1031
1032
1033
1034
1035
1036
1037 hd[i<<6].nr_sects = bios_info[i].head *
1038 bios_info[i].sect * bios_info[i].cyl;
1039 hd_ident_info[i] = (struct hd_driveid *) kmalloc(512,GFP_KERNEL);
1040 special_op[i] = 1;
1041 }
1042 if (NR_HD) {
1043 if (request_irq(HD_IRQ, hd_interrupt, SA_INTERRUPT, "hd")) {
1044 printk("hd: unable to get IRQ%d for the harddisk driver\n",HD_IRQ);
1045 NR_HD = 0;
1046 }
1047 }
1048 hd_gendisk.nr_real = NR_HD;
1049
1050 for(i=0;i<(MAX_HD << 6);i++) hd_blocksizes[i] = 1024;
1051 blksize_size[MAJOR_NR] = hd_blocksizes;
1052 }
1053
1054 static struct file_operations hd_fops = {
1055 NULL,
1056 block_read,
1057 block_write,
1058 NULL,
1059 NULL,
1060 hd_ioctl,
1061 NULL,
1062 hd_open,
1063 hd_release,
1064 block_fsync
1065 };
1066
1067 unsigned long hd_init(unsigned long mem_start, unsigned long mem_end)
1068 {
1069 if (register_blkdev(MAJOR_NR,"hd",&hd_fops)) {
1070 printk("hd: unable to get major %d for harddisk\n",MAJOR_NR);
1071 return mem_start;
1072 }
1073 blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
1074 read_ahead[MAJOR_NR] = 8;
1075 hd_gendisk.next = gendisk_head;
1076 gendisk_head = &hd_gendisk;
1077 timer_table[HD_TIMER].fn = hd_times_out;
1078 return mem_start;
1079 }
1080
1081 #define DEVICE_BUSY busy[target]
1082 #define USAGE access_count[target]
1083 #define CAPACITY (bios_info[target].head*bios_info[target].sect*bios_info[target].cyl)
1084
1085
1086 #undef MAYBE_REINIT
1087 #define GENDISK_STRUCT hd_gendisk
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097 static int revalidate_hddisk(int dev, int maxusage)
1098 {
1099 int target, major;
1100 struct gendisk * gdev;
1101 int max_p;
1102 int start;
1103 int i;
1104 long flags;
1105
1106 target = DEVICE_NR(dev);
1107 gdev = &GENDISK_STRUCT;
1108
1109 save_flags(flags);
1110 cli();
1111 if (DEVICE_BUSY || USAGE > maxusage) {
1112 restore_flags(flags);
1113 return -EBUSY;
1114 };
1115 DEVICE_BUSY = 1;
1116 restore_flags(flags);
1117
1118 max_p = gdev->max_p;
1119 start = target << gdev->minor_shift;
1120 major = MAJOR_NR << 8;
1121
1122 for (i=max_p - 1; i >=0 ; i--) {
1123 sync_dev(major | start | i);
1124 invalidate_inodes(major | start | i);
1125 invalidate_buffers(major | start | i);
1126 gdev->part[start+i].start_sect = 0;
1127 gdev->part[start+i].nr_sects = 0;
1128 };
1129
1130 #ifdef MAYBE_REINIT
1131 MAYBE_REINIT;
1132 #endif
1133
1134 gdev->part[start].nr_sects = CAPACITY;
1135 resetup_one_dev(gdev, target);
1136
1137 DEVICE_BUSY = 0;
1138 wake_up(&busy_wait);
1139 return 0;
1140 }
1141