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1 /*
2 * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28 /*
29 * Copyright (c) 1988 University of Utah.
30 * Copyright (c) 1990, 1993
31 * The Regents of the University of California. All rights reserved.
32 *
33 * This code is derived from software contributed to Berkeley by
34 * the Systems Programming Group of the University of Utah Computer
35 * Science Department.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 3. All advertising materials mentioning features or use of this software
46 * must display the following acknowledgement:
47 * This product includes software developed by the University of
48 * California, Berkeley and its contributors.
49 * 4. Neither the name of the University nor the names of its contributors
50 * may be used to endorse or promote products derived from this software
51 * without specific prior written permission.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63 * SUCH DAMAGE.
64 *
65 * from: Utah Hdr: vn.c 1.13 94/04/02
66 *
67 * from: @(#)vn.c 8.6 (Berkeley) 4/1/94
68 * $FreeBSD: src/sys/dev/vn/vn.c,v 1.105.2.4 2001/11/18 07:11:00 dillon Exp $
69 */
70
71 /*
72 * RAM disk driver.
73 *
74 * Block interface to a ramdisk.
75 *
76 */
77
78 #include <sys/param.h>
79 #include <sys/kernel.h>
80 #include <sys/mount.h>
81 #include <sys/namei.h>
82 #include <sys/proc.h>
83 #include <sys/buf.h>
84 #include <sys/malloc.h>
85 #include <sys/mount.h>
86 #include <sys/fcntl.h>
87 #include <sys/conf.h>
88 #include <sys/disk.h>
89 #include <sys/stat.h>
90 #include <sys/vm.h>
91 #include <sys/uio_internal.h>
92 #include <libkern/libkern.h>
93
94 #include <vm/pmap.h>
95 #include <vm/vm_pager.h>
96 #include <mach/memory_object_types.h>
97
98 #include <miscfs/devfs/devfs.h>
99
100
101 void mdevinit(int the_cnt);
102
103 static open_close_fcn_t mdevopen;
104 static open_close_fcn_t mdevclose;
105 static psize_fcn_t mdevsize;
106 static strategy_fcn_t mdevstrategy;
107 static int mdevbioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p);
108 static int mdevcioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p);
109 static int mdevrw(dev_t dev, struct uio *uio, int ioflag);
110 static char * nonspace(char *pos, char *end);
111 static char * getspace(char *pos, char *end);
112 static char * cvtnum(char *pos, char *end, unsigned int *num);
113
114 extern void bcopy_phys(addr64_t from, addr64_t to, vm_size_t bytes);
115 extern void mapping_set_mod(ppnum_t pn);
116 extern ppnum_t pmap_find_phys(pmap_t pmap, addr64_t va);
117
118
119 /*
120 * cdevsw
121 * D_DISK we want to look like a disk
122 * D_CANFREE We support B_FREEBUF
123 */
124
125 static struct bdevsw mdevbdevsw = {
126 /* open */ mdevopen,
127 /* close */ mdevclose,
128 /* strategy */ mdevstrategy,
129 /* ioctl */ mdevbioctl,
130 /* dump */ eno_dump,
131 /* psize */ mdevsize,
132 /* flags */ D_DISK,
133 };
134
135 static struct cdevsw mdevcdevsw = {
136 /* open */ mdevopen,
137 /* close */ mdevclose,
138 /* read */ mdevrw,
139 /* write */ mdevrw,
140 /* ioctl */ mdevcioctl,
141 /* stop */ eno_stop,
142 /* reset */ eno_reset,
143 /* ttys */ 0,
144 /* select */ eno_select,
145 /* mmap */ eno_mmap,
146 /* strategy */ eno_strat,
147 /* getc */ eno_getc,
148 /* putc */ eno_putc,
149 /* flags */ D_DISK,
150 };
151
152 struct mdev {
153 vm_offset_t mdBase; /* file size in bytes */
154 uint32_t mdSize; /* file size in bytes */
155 int mdFlags; /* flags */
156 int mdSecsize; /* sector size */
157 int mdBDev; /* Block device number */
158 int mdCDev; /* Character device number */
159 void * mdbdevb;
160 void * mdcdevb;
161 } mdev[16];
162
163 /* mdFlags */
164 #define mdInited 0x01 /* This device defined */
165 #define mdRO 0x02 /* This device is read-only */
166 #define mdPhys 0x04 /* This device is in physical memory */
167
168 int mdevBMajor = -1;
169 int mdevCMajor = -1;
170
171 static int mdevioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p, int is_char);
172 dev_t mdevadd(int devid, ppnum_t base, unsigned int size, int phys);
173 dev_t mdevlookup(int devid);
174
175 static int mdevclose(__unused dev_t dev, __unused int flags,
176 __unused int devtype, __unused struct proc *p) {
177
178 return (0);
179 }
180
181 static int mdevopen(dev_t dev, int flags, __unused int devtype, __unused struct proc *p) {
182
183 int devid;
184
185 devid = minor(dev); /* Get minor device number */
186
187 if (devid > 16) return (ENXIO); /* Not valid */
188
189 if ((flags & FWRITE) && (mdev[devid].mdFlags & mdRO)) return (EACCES); /* Currently mounted RO */
190
191 return(0);
192 }
193
194 static int mdevrw(dev_t dev, struct uio *uio, __unused int ioflag) {
195 int status;
196 addr64_t mdata;
197 int devid;
198 enum uio_seg saveflag;
199
200 devid = minor(dev); /* Get minor device number */
201
202 if (devid > 16) return (ENXIO); /* Not valid */
203 if (!(mdev[devid].mdFlags & mdInited)) return (ENXIO); /* Have we actually been defined yet? */
204
205 mdata = ((addr64_t)mdev[devid].mdBase << 12) + uio->uio_offset; /* Point to the area in "file" */
206
207 saveflag = uio->uio_segflg; /* Remember what the request is */
208 #if LP64_DEBUG
209 if (IS_VALID_UIO_SEGFLG(uio->uio_segflg) == 0) {
210 panic("mdevrw - invalid uio_segflg\n");
211 }
212 #endif /* LP64_DEBUG */
213 /* Make sure we are moving from physical ram if physical device */
214 if (mdev[devid].mdFlags & mdPhys) {
215 if (uio->uio_segflg == UIO_USERSPACE64)
216 uio->uio_segflg = UIO_PHYS_USERSPACE64;
217 else if (uio->uio_segflg == UIO_USERSPACE32)
218 uio->uio_segflg = UIO_PHYS_USERSPACE32;
219 else
220 uio->uio_segflg = UIO_PHYS_USERSPACE;
221 }
222 status = uiomove64(mdata, uio_resid(uio), uio); /* Move the data */
223 uio->uio_segflg = saveflag; /* Restore the flag */
224
225 return (status);
226 }
227
228 static void mdevstrategy(struct buf *bp) {
229 unsigned int left, lop, csize;
230 vm_offset_t vaddr, blkoff;
231 int devid;
232 addr64_t paddr, fvaddr;
233 ppnum_t pp;
234
235 devid = minor(buf_device(bp)); /* Get minor device number */
236
237 if ((mdev[devid].mdFlags & mdInited) == 0) { /* Have we actually been defined yet? */
238 buf_seterror(bp, ENXIO);
239 buf_biodone(bp);
240 return;
241 }
242
243 buf_setresid(bp, buf_count(bp)); /* Set byte count */
244
245 blkoff = buf_blkno(bp) * mdev[devid].mdSecsize; /* Get offset into file */
246
247 /*
248 * Note that reading past end is an error, but reading at end is an EOF. For these
249 * we just return with resid == count.
250 */
251
252 if (blkoff >= (mdev[devid].mdSize << 12)) { /* Are they trying to read/write at/after end? */
253 if(blkoff != (mdev[devid].mdSize << 12)) { /* Are we trying to read after EOF? */
254 buf_seterror(bp, EINVAL); /* Yeah, this is an error */
255 }
256 buf_biodone(bp); /* Return */
257 return;
258 }
259
260 if ((blkoff + buf_count(bp)) > (mdev[devid].mdSize << 12)) { /* Will this read go past end? */
261 buf_setcount(bp, ((mdev[devid].mdSize << 12) - blkoff)); /* Yes, trim to max */
262 }
263 /*
264 * make sure the buffer's data area is
265 * accessible
266 */
267 if (buf_map(bp, (caddr_t *)&vaddr))
268 panic("ramstrategy: buf_map failed\n");
269
270 fvaddr = (mdev[devid].mdBase << 12) + blkoff; /* Point to offset into ram disk */
271
272 if (buf_flags(bp) & B_READ) { /* Is this a read? */
273 if(!(mdev[devid].mdFlags & mdPhys)) { /* Physical mapped disk? */
274 bcopy((void *)((uintptr_t)fvaddr),
275 (void *)vaddr, (size_t)buf_count(bp)); /* This is virtual, just get the data */
276 }
277 else {
278 left = buf_count(bp); /* Init the amount left to copy */
279 while(left) { /* Go until it is all copied */
280
281 lop = min((4096 - (vaddr & 4095)), (4096 - (fvaddr & 4095))); /* Get smallest amount left on sink and source */
282 csize = min(lop, left); /* Don't move more than we need to */
283
284 pp = pmap_find_phys(kernel_pmap, (addr64_t)((unsigned int)vaddr)); /* Get the sink physical address */
285 if(!pp) { /* Not found, what gives? */
286 panic("mdevstrategy: sink address %016llX not mapped\n", (addr64_t)((unsigned int)vaddr));
287 }
288 paddr = (addr64_t)(((addr64_t)pp << 12) | (addr64_t)(vaddr & 4095)); /* Get actual address */
289 bcopy_phys(fvaddr, paddr, csize); /* Copy this on in */
290 mapping_set_mod(paddr >> 12); /* Make sure we know that it is modified */
291
292 left = left - csize; /* Calculate what is left */
293 vaddr = vaddr + csize; /* Move to next sink address */
294 fvaddr = fvaddr + csize; /* Bump to next physical address */
295 }
296 }
297 }
298 else { /* This is a write */
299 if(!(mdev[devid].mdFlags & mdPhys)) { /* Physical mapped disk? */
300 bcopy((void *)vaddr, (void *)((uintptr_t)fvaddr),
301 (size_t)buf_count(bp)); /* This is virtual, just put the data */
302 }
303 else {
304 left = buf_count(bp); /* Init the amount left to copy */
305 while(left) { /* Go until it is all copied */
306
307 lop = min((4096 - (vaddr & 4095)), (4096 - (fvaddr & 4095))); /* Get smallest amount left on sink and source */
308 csize = min(lop, left); /* Don't move more than we need to */
309
310 pp = pmap_find_phys(kernel_pmap, (addr64_t)((unsigned int)vaddr)); /* Get the source physical address */
311 if(!pp) { /* Not found, what gives? */
312 panic("mdevstrategy: source address %016llX not mapped\n", (addr64_t)((unsigned int)vaddr));
313 }
314 paddr = (addr64_t)(((addr64_t)pp << 12) | (addr64_t)(vaddr & 4095)); /* Get actual address */
315
316 bcopy_phys(paddr, fvaddr, csize); /* Move this on out */
317
318 left = left - csize; /* Calculate what is left */
319 vaddr = vaddr + csize; /* Move to next sink address */
320 fvaddr = fvaddr + csize; /* Bump to next physical address */
321 }
322 }
323 }
324 /*
325 * buf_unmap takes care of all the cases
326 * it will unmap the buffer from kernel
327 * virtual space if that was the state
328 * when we mapped it.
329 */
330 buf_unmap(bp);
331
332 buf_setresid(bp, 0); /* Nothing more to do */
333 buf_biodone(bp); /* Say we've finished */
334 }
335
336 static int mdevbioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) {
337 return (mdevioctl(dev, cmd, data, flag, p, 0));
338 }
339
340 static int mdevcioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) {
341 return (mdevioctl(dev, cmd, data, flag, p, 1));
342 }
343
344 static int mdevioctl(dev_t dev, u_long cmd, caddr_t data, __unused int flag,
345 struct proc *p, int is_char) {
346 int error;
347 u_long *f;
348 u_int64_t *o;
349 int devid;
350
351 devid = minor(dev); /* Get minor device number */
352
353 if (devid > 16) return (ENXIO); /* Not valid */
354
355 error = proc_suser(p); /* Are we superman? */
356 if (error) return (error); /* Nope... */
357
358 f = (u_long*)data;
359 o = (u_int64_t *)data;
360
361 switch (cmd) {
362
363 case DKIOCGETMAXBLOCKCOUNTREAD:
364 *o = 32;
365 break;
366
367 case DKIOCGETMAXBLOCKCOUNTWRITE:
368 *o = 32;
369 break;
370
371 case DKIOCGETMAXSEGMENTCOUNTREAD:
372 *o = 32;
373 break;
374
375 case DKIOCGETMAXSEGMENTCOUNTWRITE:
376 *o = 32;
377 break;
378
379 case DKIOCGETBLOCKSIZE:
380 *f = mdev[devid].mdSecsize;
381 break;
382
383 case DKIOCSETBLOCKSIZE:
384 if (is_char) return (ENODEV); /* We can only do this for a block */
385
386 if (*f < DEV_BSIZE) return (EINVAL); /* Too short? */
387
388 mdev[devid].mdSecsize = *f; /* set the new block size */
389 break;
390
391 case DKIOCISWRITABLE:
392 *f = 1;
393 break;
394
395 case DKIOCGETBLOCKCOUNT32:
396 if(!(mdev[devid].mdFlags & mdInited)) return (ENXIO);
397 *f = ((mdev[devid].mdSize << 12) + mdev[devid].mdSecsize - 1) / mdev[devid].mdSecsize;
398 break;
399
400 case DKIOCGETBLOCKCOUNT:
401 if(!(mdev[devid].mdFlags & mdInited)) return (ENXIO);
402 *o = ((mdev[devid].mdSize << 12) + mdev[devid].mdSecsize - 1) / mdev[devid].mdSecsize;
403 break;
404
405 default:
406 error = ENOTTY;
407 break;
408 }
409 return(error);
410 }
411
412
413 static int mdevsize(dev_t dev) {
414
415 int devid;
416
417 devid = minor(dev); /* Get minor device number */
418 if (devid > 16) return (ENXIO); /* Not valid */
419
420 if ((mdev[devid].mdFlags & mdInited) == 0) return(-1); /* Not inited yet */
421
422 return(mdev[devid].mdSecsize);
423 }
424
425 #include <pexpert/pexpert.h>
426
427 void mdevinit(__unused int the_cnt) {
428
429 int devid, phys;
430 ppnum_t base;
431 unsigned int size;
432 char *ba, *lp;
433 dev_t dev;
434
435
436 ba = PE_boot_args(); /* Get the boot arguments */
437 lp = ba + 256; /* Point to the end */
438
439 while(1) { /* Step through, looking for our keywords */
440 phys = 0; /* Assume virtual memory device */
441 ba = nonspace(ba, lp); /* Find non-space */
442 if(ba >= lp) return; /* We are done if no more... */
443 if(((ba[0] != 'v') && (ba[0] != 'p'))
444 || (ba[1] != 'm') || (ba[2] != 'd') || (ba[4] != '=')
445 || (ba[3] < '0') || (ba[3] > 'f')
446 || ((ba[3] > '9') && (ba[3] < 'a'))) { /* Is this of form "vmdx=" or "pmdx=" where x is hex digit? */
447
448 ba = getspace(ba, lp); /* Find next white space or end */
449 continue; /* Start looking for the next one */
450 }
451
452 if(ba[0] == 'p') phys = 1; /* Set physical memory disk */
453
454 devid = ba[3] & 0xF; /* Assume digit */
455 if(ba[3] > '9') devid += 9; /* Adjust for hex digits */
456
457 ba = &ba[5]; /* Step past keyword */
458 ba = cvtnum(ba, lp, &base); /* Convert base of memory disk */
459 if(ba >= lp) return; /* Malformed one at the end, leave */
460 if(ba[0] != '.') continue; /* If not length separater, try next... */
461 if(base & 0xFFF) continue; /* Only allow page aligned stuff */
462
463 ba++; /* Step past '.' */
464 ba = cvtnum(ba, lp, &size); /* Try to convert it */
465 if(!size || (size & 0xFFF)) continue; /* Allow only non-zer page size multiples */
466 if(ba < lp) { /* If we are not at end, check end character */
467 if((ba[0] != ' ') && (ba[0] != 0)) continue; /* End must be null or space */
468 }
469
470 dev = mdevadd(devid, base >> 12, size >> 12, phys); /* Go add the device */
471 }
472
473 return;
474
475 }
476
477 char *nonspace(char *pos, char *end) { /* Find next non-space in string */
478
479 if(pos >= end) return end; /* Don't go past end */
480 if(pos[0] == 0) return end; /* If at null, make end */
481
482 while(1) { /* Keep going */
483 if(pos[0] != ' ') return pos; /* Leave if we found one */
484 pos++; /* Stop */
485 if(pos >= end) return end; /* Quit if we run off end */
486 }
487 }
488
489 char *getspace(char *pos, char *end) { /* Find next non-space in string */
490
491 while(1) { /* Keep going */
492 if(pos >= end) return end; /* Don't go past end */
493 if(pos[0] == 0) return end; /* Leave if we hit null */
494 if(pos[0] == ' ') return pos; /* Leave if we found one */
495 pos++; /* Stop */
496 }
497 }
498
499 char *cvtnum(char *pos, char *end, unsigned int *num) { /* Convert to a number */
500
501 int rad, dig;
502
503 *num = 0; /* Set answer to 0 to start */
504 rad = 10;
505
506 if(pos >= end) return end; /* Don't go past end */
507 if(pos[0] == 0) return end; /* If at null, make end */
508
509 if(pos[0] == '0' && ((pos[1] == 'x') || (pos[1] == 'x'))) { /* A hex constant? */
510 rad = 16;
511 pos += 2; /* Point to the number */
512 }
513
514 while(1) { /* Convert it */
515
516 if(pos >= end) return end; /* Don't go past end */
517 if(pos[0] == 0) return end; /* If at null, make end */
518 if(pos[0] < '0') return pos; /* Leave if non-digit */
519 dig = pos[0] & 0xF; /* Extract digit */
520 if(pos[0] > '9') { /* Is it bigger than 9? */
521 if(rad == 10) return pos; /* Leave if not base 10 */
522 if(!(((pos[0] >= 'A') && (pos[0] <= 'F'))
523 || ((pos[0] >= 'a') && (pos[0] <= 'f')))) return pos; /* Leave if bogus char */
524 dig = dig + 9; /* Adjust for character */
525 }
526 *num = (*num * rad) + dig; /* Accumulate the number */
527 pos++; /* Step on */
528 }
529 }
530
531 dev_t mdevadd(int devid, ppnum_t base, unsigned int size, int phys) {
532
533 int i;
534
535 if(devid < 0) {
536
537 devid = -1;
538 for(i = 0; i < 16; i++) { /* Search all known memory devices */
539 if(!(mdev[i].mdFlags & mdInited)) { /* Is this a free one? */
540 if(devid < 0)devid = i; /* Remember first free one */
541 continue; /* Skip check */
542 }
543 if(!(((base + size -1 ) < mdev[i].mdBase) || ((mdev[i].mdBase + mdev[i].mdSize - 1) < base))) { /* Is there any overlap? */
544 panic("mdevadd: attempt to add overlapping memory device at %08X-%08X\n", mdev[i].mdBase, mdev[i].mdBase + mdev[i].mdSize - 1);
545 }
546 }
547 if(devid < 0) { /* Do we have free slots? */
548 panic("mdevadd: attempt to add more than 16 memory devices\n");
549 }
550 }
551 else {
552 if(devid >= 16) { /* Giving us something bogus? */
553 panic("mdevadd: attempt to explicitly add a bogus memory device: &08X\n", devid);
554 }
555 if(mdev[devid].mdFlags &mdInited) { /* Already there? */
556 panic("mdevadd: attempt to explicitly add a previously defined memory device: &08X\n", devid);
557 }
558 }
559
560 if(mdevBMajor < 0) { /* Have we gotten a major number yet? */
561 mdevBMajor = bdevsw_add(-1, &mdevbdevsw); /* Add to the table and figure out a major number */
562 if (mdevBMajor < 0) {
563 printf("mdevadd: error - bdevsw_add() returned %d\n", mdevBMajor);
564 return -1;
565 }
566 }
567
568 if(mdevCMajor < 0) { /* Have we gotten a major number yet? */
569 mdevCMajor = cdevsw_add_with_bdev(-1, &mdevcdevsw, mdevBMajor); /* Add to the table and figure out a major number */
570 if (mdevCMajor < 0) {
571 printf("ramdevice_init: error - cdevsw_add() returned %d\n", mdevCMajor);
572 return -1;
573 }
574 }
575
576 mdev[devid].mdBDev = makedev(mdevBMajor, devid); /* Get the device number */
577 mdev[devid].mdbdevb = devfs_make_node(mdev[devid].mdBDev, DEVFS_BLOCK, /* Make the node */
578 UID_ROOT, GID_OPERATOR,
579 0600, "md%d", devid);
580 if (mdev[devid].mdbdevb == NULL) { /* Did we make one? */
581 printf("mdevadd: devfs_make_node for block failed!\n");
582 return -1; /* Nope... */
583 }
584
585 mdev[devid].mdCDev = makedev(mdevCMajor, devid); /* Get the device number */
586 mdev[devid].mdcdevb = devfs_make_node(mdev[devid].mdCDev, DEVFS_CHAR, /* Make the node */
587 UID_ROOT, GID_OPERATOR,
588 0600, "rmd%d", devid);
589 if (mdev[devid].mdcdevb == NULL) { /* Did we make one? */
590 printf("mdevadd: devfs_make_node for character failed!\n");
591 return -1; /* Nope... */
592 }
593
594 mdev[devid].mdBase = base; /* Set the base address of ram disk */
595 mdev[devid].mdSize = size; /* Set the length of the ram disk */
596 mdev[devid].mdSecsize = DEV_BSIZE; /* Set starting block size */
597 if(phys) mdev[devid].mdFlags |= mdPhys; /* Show that we are in physical memory */
598 mdev[devid].mdFlags |= mdInited; /* Show we are all set up */
599 printf("Added memory device md%x/rmd%x (%08X/%08X) at %08X for %08X\n",
600 devid, devid, mdev[devid].mdBDev, mdev[devid].mdCDev, base << 12, size << 12);
601 return mdev[devid].mdBDev;
602 }
603
604
605 dev_t mdevlookup(int devid) {
606
607 if((devid < 0) || (devid > 15)) return -1; /* Filter any bogus requests */
608 if(!(mdev[devid].mdFlags & mdInited)) return -1; /* This one hasn't been defined */
609 return mdev[devid].mdBDev; /* Return the device number */
610 }
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