]> git.saurik.com Git - apple/xnu.git/blob - bsd/dev/memdev.c
projects / apple / xnu.git / blob
? search:


bc41c0d4467a98345670bb2e38eca8b037565bb8
[apple/xnu.git] / bsd / dev / memdev.c
1 /*
2 * Copyright (c) 1988 University of Utah.
3 * Copyright (c) 1990, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * the Systems Programming Group of the University of Utah Computer
8 * Science Department.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * from: Utah Hdr: vn.c 1.13 94/04/02
39 *
40 * from: @(#)vn.c 8.6 (Berkeley) 4/1/94
41 * $FreeBSD: src/sys/dev/vn/vn.c,v 1.105.2.4 2001/11/18 07:11:00 dillon Exp $
42 */
43
44 /*
45 * RAM disk driver.
46 *
47 * Block interface to a ramdisk.
48 *
49 */
50
51
52 #include <sys/param.h>
53 #include <sys/systm.h>
54 #include <sys/kernel.h>
55 #include <sys/mount.h>
56 #include <sys/namei.h>
57 #include <sys/proc.h>
58 #include <sys/buf.h>
59 #include <sys/malloc.h>
60 #include <sys/mount.h>
61 #include <sys/vnode.h>
62 #include <sys/fcntl.h>
63 #include <sys/conf.h>
64 #include <dev/disk.h>
65 #include <sys/stat.h>
66
67 #include <sys/vm.h>
68
69 #include <vm/vm_pager.h>
70 #include <vm/vm_pageout.h>
71 #include <mach/memory_object_types.h>
72
73 #include <miscfs/devfs/devfs.h>
74
75 static open_close_fcn_t mdevopen;
76 static open_close_fcn_t mdevclose;
77 static psize_fcn_t mdevsize;
78 static strategy_fcn_t mdevstrategy;
79 static int mdevbioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p);
80 static int mdevcioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p);
81 static int mdevrw(dev_t dev, struct uio *uio, int ioflag);
82 static char *nonspace(char *pos, char *end);
83 static char *getspace(char *pos, char *end);
84 static char *cvtnum(char *pos, char *end, unsigned int *num);
85
86 /*
87 * cdevsw
88 * D_DISK we want to look like a disk
89 * D_CANFREE We support B_FREEBUF
90 */
91
92 static struct bdevsw mdevbdevsw = {
93 /* open */ mdevopen,
94 /* close */ mdevclose,
95 /* strategy */ mdevstrategy,
96 /* ioctl */ mdevbioctl,
97 /* dump */ eno_dump,
98 /* psize */ mdevsize,
99 /* flags */ D_DISK,
100 };
101
102 static struct cdevsw mdevcdevsw = {
103 /* open */ mdevopen,
104 /* close */ mdevclose,
105 /* read */ mdevrw,
106 /* write */ mdevrw,
107 /* ioctl */ mdevcioctl,
108 /* stop */ eno_stop,
109 /* reset */ eno_reset,
110 /* ttys */ 0,
111 /* select */ eno_select,
112 /* mmap */ eno_mmap,
113 /* strategy */ eno_strat,
114 /* getc */ eno_getc,
115 /* putc */ eno_putc,
116 /* flags */ D_DISK,
117 };
118
119 struct mdev {
120 vm_offset_t mdBase; /* file size in bytes */
121 uint32_t mdSize; /* file size in bytes */
122 int mdFlags; /* flags */
123 int mdSecsize; /* sector size */
124 int mdBDev; /* Block device number */
125 int mdCDev; /* Character device number */
126 void * mdbdevb;
127 void * mdcdevb;
128 } mdev[16];
129
130 /* mdFlags */
131 #define mdInited 0x01 /* This device defined */
132 #define mdRO 0x02 /* This device is read-only */
133 #define mdPhys 0x04 /* This device is in physical memory */
134
135 int mdevBMajor = -1;
136 int mdevCMajor = -1;
137
138 static int mdevioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p, int is_char);
139 dev_t mdevadd(int devid, ppnum_t base, unsigned int size, int phys);
140 dev_t mdevlookup(int devid);
141
142 static int mdevclose(dev_t dev, int flags, int devtype, struct proc *p) {
143 return (0);
144 }
145
146 static int mdevopen(dev_t dev, int flags, int devtype, struct proc *p) {
147
148 int devid;
149
150 devid = minor(dev); /* Get minor device number */
151
152 if (devid > 16) return (ENXIO); /* Not valid */
153
154 if ((flags & FWRITE) && (mdev[devid].mdFlags & mdRO)) return (EACCES); /* Currently mounted RO */
155
156 return(0);
157 }
158
159 static int mdevrw(dev_t dev, struct uio *uio, int ioflag) {
160 int status;
161 int unit;
162 addr64_t mdata;
163 int devid;
164 enum uio_seg saveflag;
165
166 devid = minor(dev); /* Get minor device number */
167
168 if (devid > 16) return (ENXIO); /* Not valid */
169 if (!(mdev[devid].mdFlags & mdInited)) return (ENXIO); /* Have we actually been defined yet? */
170
171 mdata = ((addr64_t)mdev[devid].mdBase << 12) + uio->uio_offset; /* Point to the area in "file" */
172
173 saveflag = uio->uio_segflg; /* Remember what the request is */
174 if (mdev[devid].mdFlags & mdPhys) uio->uio_segflg = UIO_PHYS_USERSPACE; /* Make sure we are moving from physical ram if physical device */
175 status = uiomove64(mdata, uio->uio_resid, uio); /* Move the data */
176 uio->uio_segflg = saveflag; /* Restore the flag */
177
178 return (status);
179 }
180
181 static void mdevstrategy(struct buf *bp) {
182 int unmap;
183 unsigned int sz, left, lop, csize;
184 kern_return_t ret;
185 vm_offset_t vaddr, blkoff;
186 struct buf *tbuf;
187 int devid;
188 addr64_t paddr, fvaddr;
189 ppnum_t pp;
190
191 devid = minor(bp->b_dev); /* Get minor device number */
192
193 if ((mdev[devid].mdFlags & mdInited) == 0) { /* Have we actually been defined yet? */
194 bp->b_error = ENXIO;
195 bp->b_flags |= B_ERROR;
196 biodone(bp);
197 return;
198 }
199
200 bp->b_resid = bp->b_bcount; /* Set byte count */
201
202 blkoff = bp->b_blkno * mdev[devid].mdSecsize; /* Get offset into file */
203
204 /*
205 * Note that reading past end is an error, but reading at end is an EOF. For these
206 * we just return with b_resid == b_bcount.
207 */
208
209 if (blkoff >= (mdev[devid].mdSize << 12)) { /* Are they trying to read/write at/after end? */
210 if(blkoff != (mdev[devid].mdSize << 12)) { /* Are we trying to read after EOF? */
211 bp->b_error = EINVAL; /* Yeah, this is an error */
212 bp->b_flags |= B_ERROR | B_INVAL;
213 }
214 biodone(bp); /* Return */
215 return;
216 }
217
218 if ((blkoff + bp->b_bcount) > (mdev[devid].mdSize << 12)) { /* Will this read go past end? */
219 bp->b_bcount = ((mdev[devid].mdSize << 12) - blkoff); /* Yes, trim to max */
220 }
221
222 vaddr = 0; /* Assume not mapped yet */
223 unmap = 0;
224
225 if (bp->b_flags & B_VECTORLIST) { /* Do we have a list of UPLs? */
226 tbuf = (struct buf *)bp->b_real_bp; /* Get this for C's inadequacies */
227 if((bp->b_flags & B_NEED_IODONE) && /* If we have a UPL, is it already mapped? */
228 tbuf &&
229 tbuf->b_data) {
230 vaddr = tbuf->b_data; /* We already have this mapped in, get base address */
231 }
232 else { /* Not mapped yet */
233 ret = ubc_upl_map(bp->b_pagelist, &vaddr); /* Map it in */
234 if(ret != KERN_SUCCESS) panic("ramstrategy: ubc_upl_map failed, rc = %08X\n", ret);
235 unmap = 1; /* Remember to unmap later */
236 }
237 vaddr = vaddr += bp->b_uploffset; /* Calculate actual vaddr */
238 }
239 else vaddr = bp->b_data; /* No UPL, we already have address */
240
241 fvaddr = (mdev[devid].mdBase << 12) + blkoff; /* Point to offset into ram disk */
242
243 if(bp->b_flags & B_READ) { /* Is this a read? */
244 if(!(mdev[devid].mdFlags & mdPhys)) { /* Physical mapped disk? */
245 bcopy((void *)fvaddr, (void *)vaddr, bp->b_bcount); /* This is virtual, just get the data */
246 }
247 else {
248 left = bp->b_bcount; /* Init the amount left to copy */
249 while(left) { /* Go until it is all copied */
250
251 lop = min((4096 - (vaddr & 4095)), (4096 - (fvaddr & 4095))); /* Get smallest amount left on sink and source */
252 csize = min(lop, left); /* Don't move more than we need to */
253
254 pp = pmap_find_phys(kernel_pmap, (addr64_t)((unsigned int)vaddr)); /* Get the sink physical address */
255 if(!pp) { /* Not found, what gives? */
256 panic("mdevstrategy: sink address %016llX not mapped\n", (addr64_t)((unsigned int)vaddr));
257 }
258 paddr = (addr64_t)(((addr64_t)pp << 12) | (addr64_t)(vaddr & 4095)); /* Get actual address */
259 bcopy_phys(fvaddr, paddr, csize); /* Copy this on in */
260 mapping_set_mod(paddr >> 12); /* Make sure we know that it is modified */
261
262 left = left - csize; /* Calculate what is left */
263 vaddr = vaddr + csize; /* Move to next sink address */
264 fvaddr = fvaddr + csize; /* Bump to next physical address */
265 }
266 }
267 }
268 else { /* This is a write */
269 if(!(mdev[devid].mdFlags & mdPhys)) { /* Physical mapped disk? */
270 bcopy((void *)vaddr, (void *)fvaddr, bp->b_bcount); /* This is virtual, just put the data */
271 }
272 else {
273 left = bp->b_bcount; /* Init the amount left to copy */
274 while(left) { /* Go until it is all copied */
275
276 lop = min((4096 - (vaddr & 4095)), (4096 - (fvaddr & 4095))); /* Get smallest amount left on sink and source */
277 csize = min(lop, left); /* Don't move more than we need to */
278
279 pp = pmap_find_phys(kernel_pmap, (addr64_t)((unsigned int)vaddr)); /* Get the source physical address */
280 if(!pp) { /* Not found, what gives? */
281 panic("mdevstrategy: source address %016llX not mapped\n", (addr64_t)((unsigned int)vaddr));
282 }
283 paddr = (addr64_t)(((addr64_t)pp << 12) | (addr64_t)(vaddr & 4095)); /* Get actual address */
284
285 bcopy_phys(paddr, fvaddr, csize); /* Move this on out */
286
287 left = left - csize; /* Calculate what is left */
288 vaddr = vaddr + csize; /* Move to next sink address */
289 fvaddr = fvaddr + csize; /* Bump to next physical address */
290 }
291 }
292 }
293
294 if (unmap) { /* Do we need to unmap this? */
295 ubc_upl_unmap(bp->b_pagelist); /* Yes, unmap it */
296 }
297
298 bp->b_resid = 0; /* Nothing more to do */
299 biodone(bp); /* Say we've finished */
300 }
301
302 static int mdevbioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) {
303 return (mdevioctl(dev, cmd, data, flag, p, 0));
304 }
305
306 static int mdevcioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) {
307 return (mdevioctl(dev, cmd, data, flag, p, 1));
308 }
309
310 static int mdevioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p, int is_char) {
311
312 int error;
313 u_long *f;
314 u_int64_t *o;
315 int devid;
316
317 devid = minor(dev); /* Get minor device number */
318
319 if (devid > 16) return (ENXIO); /* Not valid */
320
321 error = suser(p->p_ucred, &p->p_acflag); /* Are we superman? */
322 if (error) return (error); /* Nope... */
323
324 f = (u_long*)data;
325 o = (u_int64_t *)data;
326
327 switch (cmd) {
328
329 case DKIOCGETMAXBLOCKCOUNTREAD:
330 *o = 32;
331 break;
332
333 case DKIOCGETMAXBLOCKCOUNTWRITE:
334 *o = 32;
335 break;
336
337 case DKIOCGETMAXSEGMENTCOUNTREAD:
338 *o = 32;
339 break;
340
341 case DKIOCGETMAXSEGMENTCOUNTWRITE:
342 *o = 32;
343 break;
344
345 case DKIOCGETBLOCKSIZE:
346 *f = mdev[devid].mdSecsize;
347 break;
348
349 case DKIOCSETBLOCKSIZE:
350 if (is_char) return (ENODEV); /* We can only do this for a block */
351
352 if (*f < DEV_BSIZE) return (EINVAL); /* Too short? */
353
354 mdev[devid].mdSecsize = *f; /* set the new block size */
355 break;
356
357 case DKIOCISWRITABLE:
358 *f = 1;
359 break;
360
361 case DKIOCGETBLOCKCOUNT32:
362 if(!(mdev[devid].mdFlags & mdInited)) return (ENXIO);
363 *f = ((mdev[devid].mdSize << 12) + mdev[devid].mdSecsize - 1) / mdev[devid].mdSecsize;
364 break;
365
366 case DKIOCGETBLOCKCOUNT64:
367 if(!(mdev[devid].mdFlags & mdInited)) return (ENXIO);
368 *o = ((mdev[devid].mdSize << 12) + mdev[devid].mdSecsize - 1) / mdev[devid].mdSecsize;
369 break;
370
371 default:
372 error = ENOTTY;
373 break;
374 }
375 return(error);
376 }
377
378
379 static int mdevsize(dev_t dev) {
380
381 int devid;
382
383 devid = minor(dev); /* Get minor device number */
384 if (devid > 16) return (ENXIO); /* Not valid */
385
386 if ((mdev[devid].mdFlags & mdInited) == 0) return(-1); /* Not inited yet */
387
388 return(mdev[devid].mdSecsize);
389 }
390
391
392 void mdevinit(int cnt) {
393
394 int devid, phys;
395 ppnum_t base;
396 unsigned int size;
397 char *ba, *lp;
398 dev_t dev;
399
400
401 ba = PE_boot_args(); /* Get the boot arguments */
402 lp = ba + 256; /* Point to the end */
403
404 while(1) { /* Step through, looking for our keywords */
405 phys = 0; /* Assume virtual memory device */
406 ba = nonspace(ba, lp); /* Find non-space */
407 if(ba >= lp) return; /* We are done if no more... */
408 if(((ba[0] != 'v') && (ba[0] != 'p'))
409 || (ba[1] != 'm') || (ba[2] != 'd') || (ba[4] != '=')
410 || (ba[3] < '0') || (ba[3] > 'f')
411 || ((ba[3] > '9') && (ba[3] < 'a'))) { /* Is this of form "vmdx=" or "pmdx=" where x is hex digit? */
412
413 ba = getspace(ba, lp); /* Find next white space or end */
414 continue; /* Start looking for the next one */
415 }
416
417 if(ba[0] == 'p') phys = 1; /* Set physical memory disk */
418
419 devid = ba[3] & 0xF; /* Assume digit */
420 if(ba[3] > '9') devid += 9; /* Adjust for hex digits */
421
422 ba = &ba[5]; /* Step past keyword */
423 ba = cvtnum(ba, lp, &base); /* Convert base of memory disk */
424 if(ba >= lp) return; /* Malformed one at the end, leave */
425 if(ba[0] != '.') continue; /* If not length separater, try next... */
426 if(base & 0xFFF) continue; /* Only allow page aligned stuff */
427
428 ba++; /* Step past '.' */
429 ba = cvtnum(ba, lp, &size); /* Try to convert it */
430 if(!size || (size & 0xFFF)) continue; /* Allow only non-zer page size multiples */
431 if(ba < lp) { /* If we are not at end, check end character */
432 if((ba[0] != ' ') && (ba[0] != 0)) continue; /* End must be null or space */
433 }
434
435 dev = mdevadd(devid, base >> 12, size >> 12, phys); /* Go add the device */
436 }
437
438 return;
439
440 }
441
442 char *nonspace(char *pos, char *end) { /* Find next non-space in string */
443
444 if(pos >= end) return end; /* Don't go past end */
445 if(pos[0] == 0) return end; /* If at null, make end */
446
447 while(1) { /* Keep going */
448 if(pos[0] != ' ') return pos; /* Leave if we found one */
449 pos++; /* Stop */
450 if(pos >= end) return end; /* Quit if we run off end */
451 }
452 }
453
454 char *getspace(char *pos, char *end) { /* Find next non-space in string */
455
456 while(1) { /* Keep going */
457 if(pos >= end) return end; /* Don't go past end */
458 if(pos[0] == 0) return end; /* Leave if we hit null */
459 if(pos[0] == ' ') return pos; /* Leave if we found one */
460 pos++; /* Stop */
461 }
462 }
463
464 char *cvtnum(char *pos, char *end, unsigned int *num) { /* Convert to a number */
465
466 int rad, dig;
467
468 *num = 0; /* Set answer to 0 to start */
469 rad = 10;
470
471 if(pos >= end) return end; /* Don't go past end */
472 if(pos[0] == 0) return end; /* If at null, make end */
473
474 if(pos[0] == '0' && ((pos[1] == 'x') || (pos[1] == 'x'))) { /* A hex constant? */
475 rad = 16;
476 pos += 2; /* Point to the number */
477 }
478
479 while(1) { /* Convert it */
480
481 if(pos >= end) return end; /* Don't go past end */
482 if(pos[0] == 0) return end; /* If at null, make end */
483 if(pos[0] < '0') return pos; /* Leave if non-digit */
484 dig = pos[0] & 0xF; /* Extract digit */
485 if(pos[0] > '9') { /* Is it bigger than 9? */
486 if(rad == 10) return pos; /* Leave if not base 10 */
487 if(!(((pos[0] >= 'A') && (pos[0] <= 'F'))
488 || ((pos[0] >= 'a') && (pos[0] <= 'f')))) return pos; /* Leave if bogus char */
489 dig = dig + 9; /* Adjust for character */
490 }
491 *num = (*num * rad) + dig; /* Accumulate the number */
492 pos++; /* Step on */
493 }
494 }
495
496 dev_t mdevadd(int devid, ppnum_t base, unsigned int size, int phys) {
497
498 int i;
499
500 if(devid < 0) {
501
502 devid = -1;
503 for(i = 0; i < 16; i++) { /* Search all known memory devices */
504 if(!(mdev[i].mdFlags & mdInited)) { /* Is this a free one? */
505 if(devid < 0)devid = i; /* Remember first free one */
506 continue; /* Skip check */
507 }
508 if(!(((base + size -1 ) < mdev[i].mdBase) || ((mdev[i].mdBase + mdev[i].mdSize - 1) < base))) { /* Is there any overlap? */
509 panic("mdevadd: attempt to add overlapping memory device at %08X-%08X\n", mdev[i].mdBase, mdev[i].mdBase + mdev[i].mdSize - 1);
510 }
511 }
512 if(devid < 0) { /* Do we have free slots? */
513 panic("mdevadd: attempt to add more than 16 memory devices\n");
514 }
515 }
516 else {
517 if(devid >= 16) { /* Giving us something bogus? */
518 panic("mdevadd: attempt to explicitly add a bogus memory device: &08X\n", devid);
519 }
520 if(mdev[devid].mdFlags &mdInited) { /* Already there? */
521 panic("mdevadd: attempt to explicitly add a previously defined memory device: &08X\n", devid);
522 }
523 }
524
525 if(mdevBMajor < 0) { /* Have we gotten a major number yet? */
526 mdevBMajor = bdevsw_add(-1, &mdevbdevsw); /* Add to the table and figure out a major number */
527 if (mdevBMajor < 0) {
528 printf("mdevadd: error - bdevsw_add() returned %d\n", mdevBMajor);
529 return -1;
530 }
531 }
532
533 if(mdevCMajor < 0) { /* Have we gotten a major number yet? */
534 mdevCMajor = cdevsw_add_with_bdev(-1, &mdevcdevsw, mdevBMajor); /* Add to the table and figure out a major number */
535 if (mdevCMajor < 0) {
536 printf("ramdevice_init: error - cdevsw_add() returned %d\n", mdevCMajor);
537 return -1;
538 }
539 }
540
541 mdev[devid].mdBDev = makedev(mdevBMajor, devid); /* Get the device number */
542 mdev[devid].mdbdevb = devfs_make_node(mdev[devid].mdBDev, DEVFS_BLOCK, /* Make the node */
543 UID_ROOT, GID_OPERATOR,
544 0600, "md%d", devid);
545 if (mdev[devid].mdbdevb == NULL) { /* Did we make one? */
546 printf("mdevadd: devfs_make_node for block failed!\n");
547 return -1; /* Nope... */
548 }
549
550 mdev[devid].mdCDev = makedev(mdevCMajor, devid); /* Get the device number */
551 mdev[devid].mdcdevb = devfs_make_node(mdev[devid].mdCDev, DEVFS_CHAR, /* Make the node */
552 UID_ROOT, GID_OPERATOR,
553 0600, "rmd%d", devid);
554 if (mdev[devid].mdcdevb == NULL) { /* Did we make one? */
555 printf("mdevadd: devfs_make_node for character failed!\n");
556 return -1; /* Nope... */
557 }
558
559 mdev[devid].mdBase = base; /* Set the base address of ram disk */
560 mdev[devid].mdSize = size; /* Set the length of the ram disk */
561 mdev[devid].mdSecsize = DEV_BSIZE; /* Set starting block size */
562 if(phys) mdev[devid].mdFlags |= mdPhys; /* Show that we are in physical memory */
563 mdev[devid].mdFlags |= mdInited; /* Show we are all set up */
564 printf("Added memory device md%x/rmd%x (%08X/%08X) at %08X for %08X\n",
565 devid, devid, mdev[devid].mdBDev, mdev[devid].mdCDev, base << 12, size << 12);
566 return mdev[devid].mdBDev;
567 }
568
569
570 dev_t mdevlookup(int devid) {
571
572 if((devid < 0) || (devid > 15)) return -1; /* Filter any bogus requests */
573 if(!(mdev[devid].mdFlags & mdInited)) return -1; /* This one hasn't been defined */
574 return mdev[devid].mdBDev; /* Return the device number */
575 }
mirror of XNU