Commit | Line | Data |
---|---|---|
18eded4b BJ |
1 | /* up.c 4.60 82/10/10 */ |
2 | .f | |
008c0481 | 3 | |
66b4fb09 | 4 | #include "up.h" |
a3cb8f60 | 5 | #if NSC > 0 |
008c0481 | 6 | /* |
10fb932f | 7 | * UNIBUS disk driver with overlapped seeks and ECC recovery. |
0c48c799 BJ |
8 | * |
9 | * TODO: | |
0c48c799 | 10 | * Add bad sector forwarding code |
299d67ed | 11 | * Check that offset recovery code works |
008c0481 BJ |
12 | */ |
13 | ||
14 | #include "../h/param.h" | |
15 | #include "../h/systm.h" | |
41888f16 | 16 | #include "../h/dk.h" |
008c0481 BJ |
17 | #include "../h/buf.h" |
18 | #include "../h/conf.h" | |
19 | #include "../h/dir.h" | |
20 | #include "../h/user.h" | |
21 | #include "../h/map.h" | |
80e7c811 | 22 | #include "../h/pte.h" |
008c0481 | 23 | #include "../h/vm.h" |
0ff318b2 | 24 | #include "../h/cmap.h" |
740e4029 | 25 | #include "../h/uio.h" |
008c0481 | 26 | |
18eded4b BJ |
27 | #include "../vax/cpu.h" |
28 | #include "../vax/nexus.h" | |
29 | #include "../vaxuba/ubavar.h" | |
30 | #include "../vaxuba/ubareg.h" | |
31 | #include "../vaxuba/upreg.h" | |
008c0481 | 32 | |
3f3a34c3 BJ |
33 | struct up_softc { |
34 | int sc_softas; | |
71236e46 | 35 | int sc_ndrive; |
3f3a34c3 | 36 | int sc_wticks; |
736772ef | 37 | int sc_recal; |
a3cb8f60 | 38 | } up_softc[NSC]; |
008c0481 | 39 | |
3f3a34c3 | 40 | /* THIS SHOULD BE READ OFF THE PACK, PER DRIVE */ |
008c0481 BJ |
41 | struct size |
42 | { | |
43 | daddr_t nblocks; | |
44 | int cyloff; | |
45 | } up_sizes[8] = { | |
c94d7fe4 BJ |
46 | #ifdef ERNIE |
47 | 49324, 0, /* A=cyl 0 thru 26 */ | |
48 | #else | |
008c0481 | 49 | 15884, 0, /* A=cyl 0 thru 26 */ |
c94d7fe4 | 50 | #endif |
008c0481 | 51 | 33440, 27, /* B=cyl 27 thru 81 */ |
d1778415 | 52 | 495520, 0, /* C=cyl 0 thru 814 */ |
008c0481 BJ |
53 | 15884, 562, /* D=cyl 562 thru 588 */ |
54 | 55936, 589, /* E=cyl 589 thru 680 */ | |
0d728200 BJ |
55 | #ifndef NOBADSECT |
56 | 81376, 681, /* F=cyl 681 thru 814 */ | |
57 | 153728, 562, /* G=cyl 562 thru 814 */ | |
58 | #else | |
59 | 81472, 681, | |
60 | 153824, 562, | |
61 | #endif | |
008c0481 | 62 | 291346, 82, /* H=cyl 82 thru 561 */ |
3f3a34c3 BJ |
63 | }, fj_sizes[8] = { |
64 | 15884, 0, /* A=cyl 0 thru 49 */ | |
65 | 33440, 50, /* B=cyl 50 thru 154 */ | |
66 | 263360, 0, /* C=cyl 0 thru 822 */ | |
67 | 0, 0, | |
68 | 0, 0, | |
69 | 0, 0, | |
70 | 0, 0, | |
0d728200 BJ |
71 | #ifndef NOBADSECT |
72 | 213664, 155, /* H=cyl 155 thru 822 */ | |
73 | #else | |
74 | 213760, 155, | |
75 | #endif | |
a1ef7a52 | 76 | }, upam_sizes[8] = { |
0cc9b5a9 BJ |
77 | 15884, 0, /* A=cyl 0 thru 31 */ |
78 | 33440, 32, /* B=cyl 32 thru 97 */ | |
79 | 524288, 0, /* C=cyl 0 thru 1023 */ | |
eadd189e SL |
80 | 27786, 668, |
81 | 27786, 723, | |
82 | 125440, 778, | |
0cc9b5a9 BJ |
83 | 181760, 668, /* G=cyl 668 thru 1022 */ |
84 | 291346, 98, /* H=cyl 98 thru 667 */ | |
008c0481 | 85 | }; |
3f3a34c3 | 86 | /* END OF STUFF WHICH SHOULD BE READ IN PER DISK */ |
008c0481 | 87 | |
cc7ff771 BJ |
88 | /* |
89 | * On a 780 upSDIST could be 2, but | |
90 | * in the interest of 750's... | |
91 | */ | |
92 | #define _upSDIST 3 /* 1.5 msec */ | |
3f3a34c3 BJ |
93 | #define _upRDIST 4 /* 2.0 msec */ |
94 | ||
95 | int upSDIST = _upSDIST; | |
96 | int upRDIST = _upRDIST; | |
97 | ||
71236e46 | 98 | int upprobe(), upslave(), upattach(), updgo(), upintr(); |
89bd2f01 BJ |
99 | struct uba_ctlr *upminfo[NSC]; |
100 | struct uba_device *updinfo[NUP]; | |
c10bcf0a BJ |
101 | #define UPIPUNITS 8 |
102 | struct uba_device *upip[NSC][UPIPUNITS]; /* fuji w/fixed head gives n,n+4 */ | |
d763a2b7 | 103 | |
71236e46 | 104 | u_short upstd[] = { 0776700, 0774400, 0776300, 0 }; |
0801d37f | 105 | struct uba_driver scdriver = |
71236e46 | 106 | { upprobe, upslave, upattach, updgo, upstd, "up", updinfo, "sc", upminfo }; |
3f3a34c3 BJ |
107 | struct buf uputab[NUP]; |
108 | ||
109 | struct upst { | |
110 | short nsect; | |
111 | short ntrak; | |
112 | short nspc; | |
113 | short ncyl; | |
114 | struct size *sizes; | |
115 | } upst[] = { | |
71236e46 BJ |
116 | 32, 19, 32*19, 823, up_sizes, /* 9300/cdc */ |
117 | /* 9300 actually has 815 cylinders... */ | |
3f3a34c3 | 118 | 32, 10, 32*10, 823, fj_sizes, /* fujitsu 160m */ |
a1ef7a52 | 119 | 32, 16, 32*16, 1024, upam_sizes, /* ampex capricorn */ |
3f3a34c3 | 120 | }; |
008c0481 | 121 | |
2601dfbd | 122 | u_char up_offset[16] = { |
299d67ed BJ |
123 | UPOF_P400, UPOF_M400, UPOF_P400, UPOF_M400, |
124 | UPOF_P800, UPOF_M800, UPOF_P800, UPOF_M800, | |
125 | UPOF_P1200, UPOF_M1200, UPOF_P1200, UPOF_M1200, | |
126 | 0, 0, 0, 0 | |
2601dfbd | 127 | }; |
008c0481 | 128 | |
0801d37f | 129 | struct buf rupbuf[NUP]; |
008c0481 | 130 | |
008c0481 BJ |
131 | #define b_cylin b_resid |
132 | ||
008c0481 BJ |
133 | #ifdef INTRLVE |
134 | daddr_t dkblock(); | |
135 | #endif | |
3f3a34c3 BJ |
136 | |
137 | int upwstart, upwatch(); /* Have started guardian */ | |
7e00c42b | 138 | int upseek; |
f88f8fdb | 139 | int upwaitdry; |
3f3a34c3 BJ |
140 | |
141 | /*ARGSUSED*/ | |
71236e46 | 142 | upprobe(reg) |
3f3a34c3 | 143 | caddr_t reg; |
008c0481 | 144 | { |
d763a2b7 BJ |
145 | register int br, cvec; |
146 | ||
71236e46 BJ |
147 | #ifdef lint |
148 | br = 0; cvec = br; br = cvec; | |
149 | #endif | |
2601dfbd | 150 | ((struct updevice *)reg)->upcs1 = UP_IE|UP_RDY; |
71236e46 | 151 | DELAY(10); |
2601dfbd | 152 | ((struct updevice *)reg)->upcs1 = 0; |
9c0adba0 | 153 | return (sizeof (struct updevice)); |
3f3a34c3 BJ |
154 | } |
155 | ||
71236e46 | 156 | upslave(ui, reg) |
89bd2f01 | 157 | struct uba_device *ui; |
3f3a34c3 BJ |
158 | caddr_t reg; |
159 | { | |
2601dfbd | 160 | register struct updevice *upaddr = (struct updevice *)reg; |
3f3a34c3 BJ |
161 | |
162 | upaddr->upcs1 = 0; /* conservative */ | |
71236e46 | 163 | upaddr->upcs2 = ui->ui_slave; |
c224ab94 | 164 | upaddr->upcs1 = UP_NOP|UP_GO; |
299d67ed | 165 | if (upaddr->upcs2&UPCS2_NED) { |
2601dfbd | 166 | upaddr->upcs1 = UP_DCLR|UP_GO; |
3f3a34c3 BJ |
167 | return (0); |
168 | } | |
71236e46 BJ |
169 | return (1); |
170 | } | |
171 | ||
172 | upattach(ui) | |
89bd2f01 | 173 | register struct uba_device *ui; |
71236e46 | 174 | { |
2601dfbd | 175 | register struct updevice *upaddr; |
71236e46 | 176 | |
6a81870e | 177 | if (upwstart == 0) { |
7780575a | 178 | timeout(upwatch, (caddr_t)0, hz); |
6a81870e BJ |
179 | upwstart++; |
180 | } | |
b7333467 BJ |
181 | if (ui->ui_dk >= 0) |
182 | dk_mspw[ui->ui_dk] = .0000020345; | |
71236e46 BJ |
183 | upip[ui->ui_ctlr][ui->ui_slave] = ui; |
184 | up_softc[ui->ui_ctlr].sc_ndrive++; | |
2601dfbd BJ |
185 | upaddr = (struct updevice *)ui->ui_addr; |
186 | upaddr->upcs1 = 0; | |
187 | upaddr->upcs2 = ui->ui_slave; | |
26e15512 | 188 | upaddr->uphr = UPHR_MAXTRAK; |
c6a51a7b | 189 | if (upaddr->uphr == 9) |
26e15512 | 190 | ui->ui_type = 1; /* fujitsu hack */ |
0cc9b5a9 BJ |
191 | else if (upaddr->uphr == 15) |
192 | ui->ui_type = 2; /* ampex hack */ | |
26e15512 BJ |
193 | upaddr->upcs2 = UPCS2_CLR; |
194 | /* | |
195 | upaddr->uphr = UPHR_MAXCYL; | |
196 | printf("maxcyl %d\n", upaddr->uphr); | |
197 | upaddr->uphr = UPHR_MAXTRAK; | |
198 | printf("maxtrak %d\n", upaddr->uphr); | |
199 | upaddr->uphr = UPHR_MAXSECT; | |
200 | printf("maxsect %d\n", upaddr->uphr); | |
201 | */ | |
3f3a34c3 BJ |
202 | } |
203 | ||
3f3a34c3 BJ |
204 | upstrategy(bp) |
205 | register struct buf *bp; | |
206 | { | |
89bd2f01 | 207 | register struct uba_device *ui; |
3f3a34c3 BJ |
208 | register struct upst *st; |
209 | register int unit; | |
7e00c42b | 210 | register struct buf *dp; |
3f3a34c3 | 211 | int xunit = minor(bp->b_dev) & 07; |
7e00c42b | 212 | long bn, sz; |
3f3a34c3 | 213 | |
7e00c42b | 214 | sz = (bp->b_bcount+511) >> 9; |
008c0481 | 215 | unit = dkunit(bp); |
3f3a34c3 BJ |
216 | if (unit >= NUP) |
217 | goto bad; | |
218 | ui = updinfo[unit]; | |
219 | if (ui == 0 || ui->ui_alive == 0) | |
220 | goto bad; | |
221 | st = &upst[ui->ui_type]; | |
222 | if (bp->b_blkno < 0 || | |
223 | (bn = dkblock(bp))+sz > st->sizes[xunit].nblocks) | |
224 | goto bad; | |
225 | bp->b_cylin = bn/st->nspc + st->sizes[xunit].cyloff; | |
0cc9b5a9 | 226 | (void) spl5(); |
7e00c42b BJ |
227 | dp = &uputab[ui->ui_unit]; |
228 | disksort(dp, bp); | |
229 | if (dp->b_active == 0) { | |
3f3a34c3 BJ |
230 | (void) upustart(ui); |
231 | bp = &ui->ui_mi->um_tab; | |
232 | if (bp->b_actf && bp->b_active == 0) | |
233 | (void) upstart(ui->ui_mi); | |
008c0481 | 234 | } |
0cc9b5a9 | 235 | (void) spl0(); |
3f3a34c3 BJ |
236 | return; |
237 | ||
238 | bad: | |
239 | bp->b_flags |= B_ERROR; | |
240 | iodone(bp); | |
241 | return; | |
008c0481 BJ |
242 | } |
243 | ||
736772ef BJ |
244 | /* |
245 | * Unit start routine. | |
246 | * Seek the drive to be where the data is | |
247 | * and then generate another interrupt | |
248 | * to actually start the transfer. | |
249 | * If there is only one drive on the controller, | |
250 | * or we are very close to the data, don't | |
251 | * bother with the search. If called after | |
252 | * searching once, don't bother to look where | |
253 | * we are, just queue for transfer (to avoid | |
254 | * positioning forever without transferrring.) | |
255 | */ | |
3f3a34c3 | 256 | upustart(ui) |
89bd2f01 | 257 | register struct uba_device *ui; |
008c0481 BJ |
258 | { |
259 | register struct buf *bp, *dp; | |
89bd2f01 | 260 | register struct uba_ctlr *um; |
2601dfbd | 261 | register struct updevice *upaddr; |
3f3a34c3 | 262 | register struct upst *st; |
008c0481 | 263 | daddr_t bn; |
736772ef | 264 | int sn, csn; |
71236e46 BJ |
265 | /* |
266 | * The SC21 cancels commands if you just say | |
2601dfbd | 267 | * cs1 = UP_IE |
71236e46 BJ |
268 | * so we are cautious about handling of cs1. |
269 | * Also don't bother to clear as bits other than in upintr(). | |
270 | */ | |
736772ef BJ |
271 | int didie = 0; |
272 | ||
273 | if (ui == 0) | |
274 | return (0); | |
89bd2f01 | 275 | um = ui->ui_mi; |
3f3a34c3 BJ |
276 | dk_busy &= ~(1<<ui->ui_dk); |
277 | dp = &uputab[ui->ui_unit]; | |
7bc8d985 | 278 | if ((bp = dp->b_actf) == NULL) |
eb891eaa | 279 | goto out; |
736772ef BJ |
280 | /* |
281 | * If the controller is active, just remember | |
282 | * that this device would like to be positioned... | |
283 | * if we tried to position now we would confuse the SC21. | |
284 | */ | |
3f3a34c3 | 285 | if (um->um_tab.b_active) { |
d763a2b7 | 286 | up_softc[um->um_ctlr].sc_softas |= 1<<ui->ui_slave; |
2a3b9a7f BJ |
287 | return (0); |
288 | } | |
736772ef BJ |
289 | /* |
290 | * If we have already positioned this drive, | |
291 | * then just put it on the ready queue. | |
292 | */ | |
a3f430e0 BJ |
293 | if (dp->b_active) |
294 | goto done; | |
295 | dp->b_active = 1; | |
2601dfbd | 296 | upaddr = (struct updevice *)um->um_addr; |
3f3a34c3 | 297 | upaddr->upcs2 = ui->ui_slave; |
736772ef BJ |
298 | /* |
299 | * If drive has just come up, | |
300 | * setup the pack. | |
301 | */ | |
299d67ed | 302 | if ((upaddr->upds & UPDS_VV) == 0) { |
71236e46 | 303 | /* SHOULD WARN SYSTEM THAT THIS HAPPENED */ |
2601dfbd BJ |
304 | upaddr->upcs1 = UP_IE|UP_DCLR|UP_GO; |
305 | upaddr->upcs1 = UP_IE|UP_PRESET|UP_GO; | |
299d67ed | 306 | upaddr->upof = UPOF_FMT22; |
eb891eaa | 307 | didie = 1; |
008c0481 | 308 | } |
736772ef BJ |
309 | /* |
310 | * If drive is offline, forget about positioning. | |
311 | */ | |
299d67ed | 312 | if ((upaddr->upds & (UPDS_DPR|UPDS_MOL)) != (UPDS_DPR|UPDS_MOL)) |
2a3b9a7f | 313 | goto done; |
736772ef BJ |
314 | /* |
315 | * If there is only one drive, | |
316 | * dont bother searching. | |
317 | */ | |
71236e46 BJ |
318 | if (up_softc[um->um_ctlr].sc_ndrive == 1) |
319 | goto done; | |
736772ef BJ |
320 | /* |
321 | * Figure out where this transfer is going to | |
322 | * and see if we are close enough to justify not searching. | |
323 | */ | |
3f3a34c3 | 324 | st = &upst[ui->ui_type]; |
008c0481 | 325 | bn = dkblock(bp); |
3f3a34c3 BJ |
326 | sn = bn%st->nspc; |
327 | sn = (sn + st->nsect - upSDIST) % st->nsect; | |
736772ef | 328 | if (bp->b_cylin - upaddr->updc) |
7bc8d985 | 329 | goto search; /* Not on-cylinder */ |
2a3b9a7f BJ |
330 | else if (upseek) |
331 | goto done; /* Ok just to be on-cylinder */ | |
008c0481 | 332 | csn = (upaddr->upla>>6) - sn - 1; |
7bc8d985 | 333 | if (csn < 0) |
3f3a34c3 BJ |
334 | csn += st->nsect; |
335 | if (csn > st->nsect - upRDIST) | |
008c0481 | 336 | goto done; |
008c0481 | 337 | search: |
736772ef BJ |
338 | upaddr->updc = bp->b_cylin; |
339 | /* | |
340 | * Not on cylinder at correct position, | |
341 | * seek/search. | |
342 | */ | |
2a3b9a7f | 343 | if (upseek) |
2601dfbd | 344 | upaddr->upcs1 = UP_IE|UP_SEEK|UP_GO; |
7e00c42b | 345 | else { |
2a3b9a7f | 346 | upaddr->upda = sn; |
2601dfbd | 347 | upaddr->upcs1 = UP_IE|UP_SEARCH|UP_GO; |
2a3b9a7f | 348 | } |
eb891eaa | 349 | didie = 1; |
736772ef BJ |
350 | /* |
351 | * Mark unit busy for iostat. | |
352 | */ | |
3f3a34c3 BJ |
353 | if (ui->ui_dk >= 0) { |
354 | dk_busy |= 1<<ui->ui_dk; | |
355 | dk_seek[ui->ui_dk]++; | |
008c0481 | 356 | } |
eb891eaa | 357 | goto out; |
008c0481 | 358 | done: |
736772ef BJ |
359 | /* |
360 | * Device is ready to go. | |
361 | * Put it on the ready queue for the controller | |
362 | * (unless its already there.) | |
363 | */ | |
2601dfbd BJ |
364 | if (dp->b_active != 2) { |
365 | dp->b_forw = NULL; | |
366 | if (um->um_tab.b_actf == NULL) | |
367 | um->um_tab.b_actf = dp; | |
368 | else | |
369 | um->um_tab.b_actl->b_forw = dp; | |
370 | um->um_tab.b_actl = dp; | |
371 | dp->b_active = 2; | |
372 | } | |
eb891eaa BJ |
373 | out: |
374 | return (didie); | |
008c0481 BJ |
375 | } |
376 | ||
736772ef BJ |
377 | /* |
378 | * Start up a transfer on a drive. | |
379 | */ | |
3f3a34c3 | 380 | upstart(um) |
89bd2f01 | 381 | register struct uba_ctlr *um; |
008c0481 BJ |
382 | { |
383 | register struct buf *bp, *dp; | |
89bd2f01 | 384 | register struct uba_device *ui; |
2601dfbd | 385 | register struct updevice *upaddr; |
7e00c42b | 386 | struct upst *st; |
008c0481 | 387 | daddr_t bn; |
f88f8fdb | 388 | int dn, sn, tn, cmd, waitdry; |
008c0481 | 389 | |
008c0481 | 390 | loop: |
736772ef BJ |
391 | /* |
392 | * Pull a request off the controller queue | |
393 | */ | |
3f3a34c3 | 394 | if ((dp = um->um_tab.b_actf) == NULL) |
eb891eaa | 395 | return (0); |
008c0481 | 396 | if ((bp = dp->b_actf) == NULL) { |
3f3a34c3 | 397 | um->um_tab.b_actf = dp->b_forw; |
008c0481 BJ |
398 | goto loop; |
399 | } | |
736772ef BJ |
400 | /* |
401 | * Mark controller busy, and | |
402 | * determine destination of this request. | |
403 | */ | |
3f3a34c3 BJ |
404 | um->um_tab.b_active++; |
405 | ui = updinfo[dkunit(bp)]; | |
008c0481 | 406 | bn = dkblock(bp); |
3f3a34c3 BJ |
407 | dn = ui->ui_slave; |
408 | st = &upst[ui->ui_type]; | |
409 | sn = bn%st->nspc; | |
410 | tn = sn/st->nsect; | |
411 | sn %= st->nsect; | |
2601dfbd | 412 | upaddr = (struct updevice *)ui->ui_addr; |
736772ef BJ |
413 | /* |
414 | * Select drive if not selected already. | |
415 | */ | |
416 | if ((upaddr->upcs2&07) != dn) | |
417 | upaddr->upcs2 = dn; | |
418 | /* | |
419 | * Check that it is ready and online | |
420 | */ | |
f88f8fdb | 421 | waitdry = 0; |
299d67ed | 422 | while ((upaddr->upds&UPDS_DRY) == 0) { |
ac1276f8 | 423 | printf("up%d: ds wait ds=%o\n",dkunit(bp),upaddr->upds); |
f88f8fdb BJ |
424 | if (++waitdry > 512) |
425 | break; | |
426 | upwaitdry++; | |
427 | } | |
299d67ed | 428 | if ((upaddr->upds & UPDS_DREADY) != UPDS_DREADY) { |
f6d201ff | 429 | printf("up%d: not ready", dkunit(bp)); |
299d67ed | 430 | if ((upaddr->upds & UPDS_DREADY) != UPDS_DREADY) { |
71236e46 | 431 | printf("\n"); |
3f3a34c3 BJ |
432 | um->um_tab.b_active = 0; |
433 | um->um_tab.b_errcnt = 0; | |
88253fd2 BJ |
434 | dp->b_actf = bp->av_forw; |
435 | dp->b_active = 0; | |
436 | bp->b_flags |= B_ERROR; | |
437 | iodone(bp); | |
88253fd2 BJ |
438 | goto loop; |
439 | } | |
736772ef BJ |
440 | /* |
441 | * Oh, well, sometimes this | |
442 | * happens, for reasons unknown. | |
443 | */ | |
2601dfbd | 444 | printf(" (flakey)\n"); |
008c0481 | 445 | } |
736772ef BJ |
446 | /* |
447 | * Setup for the transfer, and get in the | |
448 | * UNIBUS adaptor queue. | |
449 | */ | |
5aa9d5ea | 450 | upaddr->updc = bp->b_cylin; |
008c0481 | 451 | upaddr->upda = (tn << 8) + sn; |
008c0481 BJ |
452 | upaddr->upwc = -bp->b_bcount / sizeof (short); |
453 | if (bp->b_flags & B_READ) | |
2601dfbd | 454 | cmd = UP_IE|UP_RCOM|UP_GO; |
008c0481 | 455 | else |
2601dfbd | 456 | cmd = UP_IE|UP_WCOM|UP_GO; |
b7333467 | 457 | um->um_cmd = cmd; |
a0eab615 | 458 | (void) ubago(ui); |
eb891eaa | 459 | return (1); |
008c0481 BJ |
460 | } |
461 | ||
736772ef BJ |
462 | /* |
463 | * Now all ready to go, stuff the registers. | |
464 | */ | |
b7333467 | 465 | updgo(um) |
89bd2f01 | 466 | struct uba_ctlr *um; |
3f3a34c3 | 467 | { |
2601dfbd | 468 | register struct updevice *upaddr = (struct updevice *)um->um_addr; |
7e00c42b | 469 | |
de59ccc2 | 470 | um->um_tab.b_active = 2; /* should now be 2 */ |
b7333467 BJ |
471 | upaddr->upba = um->um_ubinfo; |
472 | upaddr->upcs1 = um->um_cmd|((um->um_ubinfo>>8)&0x300); | |
3f3a34c3 BJ |
473 | } |
474 | ||
736772ef BJ |
475 | /* |
476 | * Handle a disk interrupt. | |
477 | */ | |
443c8066 | 478 | upintr(sc21) |
3f3a34c3 | 479 | register sc21; |
008c0481 BJ |
480 | { |
481 | register struct buf *bp, *dp; | |
89bd2f01 BJ |
482 | register struct uba_ctlr *um = upminfo[sc21]; |
483 | register struct uba_device *ui; | |
2601dfbd | 484 | register struct updevice *upaddr = (struct updevice *)um->um_addr; |
008c0481 | 485 | register unit; |
7e00c42b | 486 | struct up_softc *sc = &up_softc[um->um_ctlr]; |
71236e46 | 487 | int as = (upaddr->upas & 0377) | sc->sc_softas; |
f88f8fdb | 488 | int needie = 1, waitdry; |
008c0481 | 489 | |
7e00c42b | 490 | sc->sc_wticks = 0; |
71236e46 | 491 | sc->sc_softas = 0; |
736772ef BJ |
492 | /* |
493 | * If controller wasn't transferring, then this is an | |
494 | * interrupt for attention status on seeking drives. | |
495 | * Just service them. | |
496 | */ | |
cc7ff771 | 497 | if (um->um_tab.b_active != 2 && !sc->sc_recal) { |
736772ef BJ |
498 | if (upaddr->upcs1 & UP_TRE) |
499 | upaddr->upcs1 = UP_TRE; | |
500 | goto doattn; | |
501 | } | |
de59ccc2 | 502 | um->um_tab.b_active = 1; |
736772ef BJ |
503 | /* |
504 | * Get device and block structures, and a pointer | |
89bd2f01 | 505 | * to the uba_device for the drive. Select the drive. |
736772ef BJ |
506 | */ |
507 | dp = um->um_tab.b_actf; | |
508 | bp = dp->b_actf; | |
509 | ui = updinfo[dkunit(bp)]; | |
510 | dk_busy &= ~(1 << ui->ui_dk); | |
511 | if ((upaddr->upcs2&07) != ui->ui_slave) | |
3f3a34c3 | 512 | upaddr->upcs2 = ui->ui_slave; |
736772ef BJ |
513 | /* |
514 | * Check for and process errors on | |
515 | * either the drive or the controller. | |
516 | */ | |
299d67ed | 517 | if ((upaddr->upds&UPDS_ERR) || (upaddr->upcs1&UP_TRE)) { |
f88f8fdb | 518 | waitdry = 0; |
299d67ed | 519 | while ((upaddr->upds & UPDS_DRY) == 0) { |
f88f8fdb BJ |
520 | if (++waitdry > 512) |
521 | break; | |
522 | upwaitdry++; | |
523 | } | |
299d67ed | 524 | if (upaddr->uper1&UPER1_WLE) { |
736772ef BJ |
525 | /* |
526 | * Give up on write locked devices | |
527 | * immediately. | |
528 | */ | |
f6d201ff | 529 | printf("up%d: write locked\n", dkunit(bp)); |
736772ef BJ |
530 | bp->b_flags |= B_ERROR; |
531 | } else if (++um->um_tab.b_errcnt > 27) { | |
532 | /* | |
533 | * After 28 retries (16 without offset, and | |
534 | * 12 with offset positioning) give up. | |
535 | */ | |
f6d201ff BJ |
536 | harderr(bp, "up"); |
537 | printf("cs2=%b er1=%b er2=%b\n", | |
c84ff1f9 BJ |
538 | upaddr->upcs2, UPCS2_BITS, |
539 | upaddr->uper1, UPER1_BITS, | |
540 | upaddr->uper2, UPER2_BITS); | |
736772ef BJ |
541 | bp->b_flags |= B_ERROR; |
542 | } else { | |
543 | /* | |
544 | * Retriable error. | |
545 | * If a soft ecc, correct it (continuing | |
546 | * by returning if necessary. | |
547 | * Otherwise fall through and retry the transfer | |
548 | */ | |
55de6ac9 | 549 | if ((upaddr->uper1&(UPER1_DCK|UPER1_ECH))==UPER1_DCK) { |
2601dfbd BJ |
550 | if (upecc(ui)) |
551 | return; | |
55de6ac9 BJ |
552 | } else |
553 | um->um_tab.b_active = 0; /* force retry */ | |
736772ef BJ |
554 | } |
555 | /* | |
556 | * Clear drive error and, every eight attempts, | |
557 | * (starting with the fourth) | |
558 | * recalibrate to clear the slate. | |
559 | */ | |
560 | upaddr->upcs1 = UP_TRE|UP_IE|UP_DCLR|UP_GO; | |
561 | needie = 0; | |
fc4d0a69 | 562 | if ((um->um_tab.b_errcnt&07) == 4 && um->um_tab.b_active == 0) { |
736772ef | 563 | upaddr->upcs1 = UP_RECAL|UP_IE|UP_GO; |
a6442a2f BJ |
564 | sc->sc_recal = 0; |
565 | goto nextrecal; | |
736772ef BJ |
566 | } |
567 | } | |
568 | /* | |
a6442a2f BJ |
569 | * Advance recalibration finite state machine |
570 | * if recalibrate in progress, through | |
571 | * RECAL | |
572 | * SEEK | |
573 | * OFFSET (optional) | |
574 | * RETRY | |
736772ef | 575 | */ |
a6442a2f BJ |
576 | switch (sc->sc_recal) { |
577 | ||
578 | case 1: | |
579 | upaddr->updc = bp->b_cylin; | |
580 | upaddr->upcs1 = UP_SEEK|UP_IE|UP_GO; | |
581 | goto nextrecal; | |
582 | case 2: | |
583 | if (um->um_tab.b_errcnt < 16 || (bp->b_flags&B_READ) == 0) | |
584 | goto donerecal; | |
299d67ed | 585 | upaddr->upof = up_offset[um->um_tab.b_errcnt & 017] | UPOF_FMT22; |
a6442a2f BJ |
586 | upaddr->upcs1 = UP_IE|UP_OFFSET|UP_GO; |
587 | goto nextrecal; | |
588 | nextrecal: | |
589 | sc->sc_recal++; | |
590 | um->um_tab.b_active = 1; | |
591 | return; | |
592 | donerecal: | |
593 | case 3: | |
736772ef | 594 | sc->sc_recal = 0; |
a6442a2f BJ |
595 | um->um_tab.b_active = 0; |
596 | break; | |
736772ef BJ |
597 | } |
598 | /* | |
599 | * If still ``active'', then don't need any more retries. | |
600 | */ | |
601 | if (um->um_tab.b_active) { | |
602 | /* | |
603 | * If we were offset positioning, | |
604 | * return to centerline. | |
605 | */ | |
606 | if (um->um_tab.b_errcnt >= 16) { | |
299d67ed | 607 | upaddr->upof = UPOF_FMT22; |
736772ef | 608 | upaddr->upcs1 = UP_RTC|UP_GO|UP_IE; |
299d67ed | 609 | while (upaddr->upds & UPDS_PIP) |
736772ef | 610 | DELAY(25); |
eb891eaa | 611 | needie = 0; |
008c0481 | 612 | } |
736772ef BJ |
613 | um->um_tab.b_active = 0; |
614 | um->um_tab.b_errcnt = 0; | |
615 | um->um_tab.b_actf = dp->b_forw; | |
616 | dp->b_active = 0; | |
617 | dp->b_errcnt = 0; | |
618 | dp->b_actf = bp->av_forw; | |
619 | bp->b_resid = (-upaddr->upwc * sizeof(short)); | |
620 | iodone(bp); | |
621 | /* | |
622 | * If this unit has more work to do, | |
623 | * then start it up right away. | |
624 | */ | |
625 | if (dp->b_actf) | |
626 | if (upustart(ui)) | |
eb891eaa | 627 | needie = 0; |
008c0481 | 628 | } |
736772ef | 629 | as &= ~(1<<ui->ui_slave); |
8c58f40c BJ |
630 | /* |
631 | * Release unibus resources and flush data paths. | |
632 | */ | |
633 | ubadone(um); | |
736772ef BJ |
634 | doattn: |
635 | /* | |
636 | * Process other units which need attention. | |
637 | * For each unit which needs attention, call | |
638 | * the unit start routine to place the slave | |
639 | * on the controller device queue. | |
640 | */ | |
a6442a2f BJ |
641 | while (unit = ffs(as)) { |
642 | unit--; /* was 1 origin */ | |
643 | as &= ~(1<<unit); | |
644 | upaddr->upas = 1<<unit; | |
c10bcf0a | 645 | if (unit < UPIPUNITS && upustart(upip[sc21][unit])) |
a6442a2f BJ |
646 | needie = 0; |
647 | } | |
736772ef BJ |
648 | /* |
649 | * If the controller is not transferring, but | |
650 | * there are devices ready to transfer, start | |
651 | * the controller. | |
652 | */ | |
3f3a34c3 BJ |
653 | if (um->um_tab.b_actf && um->um_tab.b_active == 0) |
654 | if (upstart(um)) | |
eb891eaa | 655 | needie = 0; |
2a3b9a7f | 656 | if (needie) |
2601dfbd | 657 | upaddr->upcs1 = UP_IE; |
008c0481 BJ |
658 | } |
659 | ||
740e4029 | 660 | upread(dev, uio) |
0801d37f | 661 | dev_t dev; |
740e4029 | 662 | struct uio *uio; |
008c0481 | 663 | { |
0801d37f | 664 | register int unit = minor(dev) >> 3; |
7e00c42b | 665 | |
0801d37f | 666 | if (unit >= NUP) |
0cd5eac7 BJ |
667 | return (ENXIO); |
668 | return (physio(upstrategy, &rupbuf[unit], dev, B_READ, minphys, uio)); | |
008c0481 BJ |
669 | } |
670 | ||
002227dd | 671 | upwrite(dev, uio) |
0801d37f | 672 | dev_t dev; |
002227dd | 673 | struct uio *uio; |
008c0481 | 674 | { |
0801d37f | 675 | register int unit = minor(dev) >> 3; |
7e00c42b | 676 | |
0801d37f | 677 | if (unit >= NUP) |
0cd5eac7 BJ |
678 | return (ENXIO); |
679 | return (physio(upstrategy, &rupbuf[unit], dev, B_WRITE, minphys, uio)); | |
008c0481 BJ |
680 | } |
681 | ||
7bc8d985 BJ |
682 | /* |
683 | * Correct an ECC error, and restart the i/o to complete | |
684 | * the transfer if necessary. This is quite complicated because | |
685 | * the transfer may be going to an odd memory address base and/or | |
686 | * across a page boundary. | |
687 | */ | |
3f3a34c3 | 688 | upecc(ui) |
89bd2f01 | 689 | register struct uba_device *ui; |
008c0481 | 690 | { |
2601dfbd | 691 | register struct updevice *up = (struct updevice *)ui->ui_addr; |
3f3a34c3 | 692 | register struct buf *bp = uputab[ui->ui_unit].b_actf; |
89bd2f01 | 693 | register struct uba_ctlr *um = ui->ui_mi; |
3f3a34c3 BJ |
694 | register struct upst *st; |
695 | struct uba_regs *ubp = ui->ui_hd->uh_uba; | |
7bc8d985 | 696 | register int i; |
008c0481 | 697 | caddr_t addr; |
7bc8d985 | 698 | int reg, bit, byte, npf, mask, o, cmd, ubaddr; |
008c0481 BJ |
699 | int bn, cn, tn, sn; |
700 | ||
008c0481 | 701 | /* |
7bc8d985 BJ |
702 | * Npf is the number of sectors transferred before the sector |
703 | * containing the ECC error, and reg is the UBA register | |
704 | * mapping (the first part of) the transfer. | |
705 | * O is offset within a memory page of the first byte transferred. | |
008c0481 | 706 | */ |
7bc8d985 | 707 | npf = btop((up->upwc * sizeof(short)) + bp->b_bcount) - 1; |
b7333467 | 708 | reg = btop(um->um_ubinfo&0x3ffff) + npf; |
008c0481 | 709 | o = (int)bp->b_un.b_addr & PGOFSET; |
89bd2f01 | 710 | printf("up%d%c: soft ecc sn%d\n", dkunit(bp), |
0c48c799 | 711 | 'a'+(minor(bp->b_dev)&07), bp->b_blkno + npf); |
008c0481 | 712 | mask = up->upec2; |
299d67ed | 713 | #ifdef UPECCDEBUG |
8c58f40c BJ |
714 | printf("npf %d reg %x o %d mask %o pos %d\n", npf, reg, o, mask, |
715 | up->upec1); | |
299d67ed | 716 | #endif |
7bc8d985 BJ |
717 | /* |
718 | * Flush the buffered data path, and compute the | |
719 | * byte and bit position of the error. The variable i | |
720 | * is the byte offset in the transfer, the variable byte | |
721 | * is the offset from a page boundary in main memory. | |
722 | */ | |
060afaf6 | 723 | ubapurge(um); |
7bc8d985 BJ |
724 | i = up->upec1 - 1; /* -1 makes 0 origin */ |
725 | bit = i&07; | |
726 | i = (i&~07)>>3; | |
008c0481 | 727 | byte = i + o; |
7bc8d985 BJ |
728 | /* |
729 | * Correct while possible bits remain of mask. Since mask | |
730 | * contains 11 bits, we continue while the bit offset is > -11. | |
731 | * Also watch out for end of this block and the end of the whole | |
732 | * transfer. | |
733 | */ | |
734 | while (i < 512 && (int)ptob(npf)+i < bp->b_bcount && bit > -11) { | |
735 | addr = ptob(ubp->uba_map[reg+btop(byte)].pg_pfnum)+ | |
736 | (byte & PGOFSET); | |
299d67ed | 737 | #ifdef UPECCDEBUG |
8c58f40c BJ |
738 | printf("addr %x map reg %x\n", |
739 | addr, *(int *)(&ubp->uba_map[reg+btop(byte)])); | |
740 | printf("old: %x, ", getmemc(addr)); | |
299d67ed | 741 | #endif |
7bc8d985 | 742 | putmemc(addr, getmemc(addr)^(mask<<bit)); |
299d67ed | 743 | #ifdef UPECCDEBUG |
8c58f40c | 744 | printf("new: %x\n", getmemc(addr)); |
299d67ed | 745 | #endif |
7bc8d985 BJ |
746 | byte++; |
747 | i++; | |
748 | bit -= 8; | |
008c0481 | 749 | } |
55de6ac9 BJ |
750 | if (up->upwc == 0) { |
751 | um->um_tab.b_active = 0; | |
008c0481 | 752 | return (0); |
55de6ac9 | 753 | } |
7bc8d985 BJ |
754 | /* |
755 | * Have to continue the transfer... clear the drive, | |
756 | * and compute the position where the transfer is to continue. | |
757 | * We have completed npf+1 sectors of the transfer already; | |
758 | * restart at offset o of next sector (i.e. in UBA register reg+1). | |
759 | */ | |
2601dfbd BJ |
760 | #ifdef notdef |
761 | up->uper1 = 0; | |
762 | up->upcs1 |= UP_GO; | |
763 | #else | |
764 | up->upcs1 = UP_TRE|UP_IE|UP_DCLR|UP_GO; | |
008c0481 | 765 | bn = dkblock(bp); |
3f3a34c3 | 766 | st = &upst[ui->ui_type]; |
008c0481 | 767 | cn = bp->b_cylin; |
3f3a34c3 BJ |
768 | sn = bn%st->nspc + npf + 1; |
769 | tn = sn/st->nsect; | |
770 | sn %= st->nsect; | |
771 | cn += tn/st->ntrak; | |
772 | tn %= st->ntrak; | |
008c0481 | 773 | up->updc = cn; |
7bc8d985 BJ |
774 | up->upda = (tn << 8) | sn; |
775 | ubaddr = (int)ptob(reg+1) + o; | |
776 | up->upba = ubaddr; | |
777 | cmd = (ubaddr >> 8) & 0x300; | |
2601dfbd | 778 | cmd |= UP_IE|UP_GO|UP_RCOM; |
de59ccc2 | 779 | um->um_tab.b_active = 2; /* continuing transfer ... */ |
7bc8d985 | 780 | up->upcs1 = cmd; |
2601dfbd | 781 | #endif |
008c0481 BJ |
782 | return (1); |
783 | } | |
977c2848 BJ |
784 | |
785 | /* | |
786 | * Reset driver after UBA init. | |
787 | * Cancel software state of all pending transfers | |
788 | * and restart all units and the controller. | |
789 | */ | |
3f3a34c3 | 790 | upreset(uban) |
f6d201ff | 791 | int uban; |
977c2848 | 792 | { |
89bd2f01 BJ |
793 | register struct uba_ctlr *um; |
794 | register struct uba_device *ui; | |
3f3a34c3 BJ |
795 | register sc21, unit; |
796 | ||
a3cb8f60 | 797 | for (sc21 = 0; sc21 < NSC; sc21++) { |
7e00c42b BJ |
798 | if ((um = upminfo[sc21]) == 0 || um->um_ubanum != uban || |
799 | um->um_alive == 0) | |
3f3a34c3 | 800 | continue; |
f6d201ff | 801 | printf(" sc%d", sc21); |
3f3a34c3 BJ |
802 | um->um_tab.b_active = 0; |
803 | um->um_tab.b_actf = um->um_tab.b_actl = 0; | |
f6d201ff | 804 | up_softc[sc21].sc_recal = 0; |
cc7ff771 | 805 | up_softc[sc21].sc_wticks = 0; |
b7333467 BJ |
806 | if (um->um_ubinfo) { |
807 | printf("<%d>", (um->um_ubinfo>>28)&0xf); | |
0801d37f | 808 | ubadone(um); |
3f3a34c3 | 809 | } |
299d67ed | 810 | ((struct updevice *)(um->um_addr))->upcs2 = UPCS2_CLR; |
3f3a34c3 BJ |
811 | for (unit = 0; unit < NUP; unit++) { |
812 | if ((ui = updinfo[unit]) == 0) | |
813 | continue; | |
f6d201ff | 814 | if (ui->ui_alive == 0 || ui->ui_mi != um) |
3f3a34c3 BJ |
815 | continue; |
816 | uputab[unit].b_active = 0; | |
817 | (void) upustart(ui); | |
818 | } | |
819 | (void) upstart(um); | |
977c2848 | 820 | } |
977c2848 | 821 | } |
6a81870e BJ |
822 | |
823 | /* | |
824 | * Wake up every second and if an interrupt is pending | |
825 | * but nothing has happened increment a counter. | |
f6d201ff | 826 | * If nothing happens for 20 seconds, reset the UNIBUS |
6a81870e BJ |
827 | * and begin anew. |
828 | */ | |
829 | upwatch() | |
830 | { | |
89bd2f01 | 831 | register struct uba_ctlr *um; |
3f3a34c3 | 832 | register sc21, unit; |
7e00c42b | 833 | register struct up_softc *sc; |
6a81870e | 834 | |
7780575a | 835 | timeout(upwatch, (caddr_t)0, hz); |
a3cb8f60 | 836 | for (sc21 = 0; sc21 < NSC; sc21++) { |
3f3a34c3 | 837 | um = upminfo[sc21]; |
7e00c42b BJ |
838 | if (um == 0 || um->um_alive == 0) |
839 | continue; | |
840 | sc = &up_softc[sc21]; | |
3f3a34c3 BJ |
841 | if (um->um_tab.b_active == 0) { |
842 | for (unit = 0; unit < NUP; unit++) | |
2601dfbd BJ |
843 | if (uputab[unit].b_active && |
844 | updinfo[unit]->ui_mi == um) | |
3f3a34c3 | 845 | goto active; |
7e00c42b | 846 | sc->sc_wticks = 0; |
3f3a34c3 BJ |
847 | continue; |
848 | } | |
f6d201ff | 849 | active: |
7e00c42b BJ |
850 | sc->sc_wticks++; |
851 | if (sc->sc_wticks >= 20) { | |
852 | sc->sc_wticks = 0; | |
f6d201ff | 853 | printf("sc%d: lost interrupt\n", sc21); |
a3cb8f60 | 854 | ubareset(um->um_ubanum); |
3f3a34c3 | 855 | } |
6a81870e BJ |
856 | } |
857 | } | |
0ff318b2 BJ |
858 | |
859 | #define DBSIZE 20 | |
860 | ||
861 | updump(dev) | |
862 | dev_t dev; | |
863 | { | |
2601dfbd | 864 | struct updevice *upaddr; |
0ff318b2 | 865 | char *start; |
a0eab615 | 866 | int num, blk, unit; |
0ff318b2 | 867 | struct size *sizes; |
3f3a34c3 | 868 | register struct uba_regs *uba; |
89bd2f01 | 869 | register struct uba_device *ui; |
0ff318b2 | 870 | register short *rp; |
3f3a34c3 | 871 | struct upst *st; |
cd8ce595 | 872 | register int retry; |
0ff318b2 | 873 | |
0ff318b2 | 874 | unit = minor(dev) >> 3; |
0c48c799 BJ |
875 | if (unit >= NUP) |
876 | return (ENXIO); | |
7e00c42b | 877 | #define phys(cast, addr) ((cast)((int)addr & 0x7fffffff)) |
89bd2f01 | 878 | ui = phys(struct uba_device *, updinfo[unit]); |
0c48c799 BJ |
879 | if (ui->ui_alive == 0) |
880 | return (ENXIO); | |
3f3a34c3 | 881 | uba = phys(struct uba_hd *, ui->ui_hd)->uh_physuba; |
89bd2f01 | 882 | ubainit(uba); |
2601dfbd | 883 | upaddr = (struct updevice *)ui->ui_physaddr; |
cd8ce595 | 884 | DELAY(5000000); |
3f3a34c3 | 885 | num = maxfree; |
0ff318b2 | 886 | upaddr->upcs2 = unit; |
89bd2f01 | 887 | DELAY(100); |
cd8ce595 SL |
888 | upaddr->upcs1 = UP_DCLR|UP_GO; |
889 | upaddr->upcs1 = UP_PRESET|UP_GO; | |
890 | upaddr->upof = UPOF_FMT22; | |
891 | retry = 0; | |
892 | do { | |
893 | DELAY(25); | |
894 | if (++retry > 527) | |
895 | break; | |
0599cbf1 | 896 | } while ((upaddr->upds & UP_RDY) == 0); |
299d67ed | 897 | if ((upaddr->upds & UPDS_DREADY) != UPDS_DREADY) |
0c48c799 | 898 | return (EFAULT); |
cd8ce595 | 899 | start = 0; |
7e00c42b | 900 | st = &upst[ui->ui_type]; |
3f3a34c3 | 901 | sizes = phys(struct size *, st->sizes); |
0c48c799 BJ |
902 | if (dumplo < 0 || dumplo + num >= sizes[minor(dev)&07].nblocks) |
903 | return (EINVAL); | |
0ff318b2 BJ |
904 | while (num > 0) { |
905 | register struct pte *io; | |
906 | register int i; | |
907 | int cn, sn, tn; | |
908 | daddr_t bn; | |
909 | ||
910 | blk = num > DBSIZE ? DBSIZE : num; | |
3f3a34c3 | 911 | io = uba->uba_map; |
0ff318b2 | 912 | for (i = 0; i < blk; i++) |
89bd2f01 | 913 | *(int *)io++ = (btop(start)+i) | (1<<21) | UBAMR_MRV; |
0ff318b2 BJ |
914 | *(int *)io = 0; |
915 | bn = dumplo + btop(start); | |
71236e46 BJ |
916 | cn = bn/st->nspc + sizes[minor(dev)&07].cyloff; |
917 | sn = bn%st->nspc; | |
918 | tn = sn/st->nsect; | |
919 | sn = sn%st->nsect; | |
0ff318b2 BJ |
920 | upaddr->updc = cn; |
921 | rp = (short *) &upaddr->upda; | |
922 | *rp = (tn << 8) + sn; | |
923 | *--rp = 0; | |
924 | *--rp = -blk*NBPG / sizeof (short); | |
2601dfbd | 925 | *--rp = UP_GO|UP_WCOM; |
cd8ce595 | 926 | retry = 0; |
0ff318b2 BJ |
927 | do { |
928 | DELAY(25); | |
cd8ce595 SL |
929 | if (++retry > 527) |
930 | break; | |
2601dfbd | 931 | } while ((upaddr->upcs1 & UP_RDY) == 0); |
cd8ce595 | 932 | if ((upaddr->upds & UPDS_DREADY) != UPDS_DREADY) { |
0599cbf1 | 933 | printf("up%d: not ready", unit); |
cd8ce595 SL |
934 | if ((upaddr->upds & UPDS_DREADY) != UPDS_DREADY) { |
935 | printf("\n"); | |
936 | return (EIO); | |
937 | } | |
938 | printf(" (flakey)\n"); | |
939 | } | |
299d67ed | 940 | if (upaddr->upds&UPDS_ERR) |
0c48c799 | 941 | return (EIO); |
0ff318b2 BJ |
942 | start += blk*NBPG; |
943 | num -= blk; | |
944 | } | |
0ff318b2 BJ |
945 | return (0); |
946 | } | |
63c35a63 | 947 | #endif |