1 /*
2 * Copyright (c) 2004-2019 Apple 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_xnu.h>
96 #include <mach/memory_object_types.h>
97 #include <kern/debug.h>
98
99 #include <miscfs/devfs/devfs.h>
100
101
102 void mdevinit(int the_cnt);
103
104 static open_close_fcn_t mdevopen;
105 static open_close_fcn_t mdevclose;
106 static psize_fcn_t mdevsize;
107 static strategy_fcn_t mdevstrategy;
108 static int mdevbioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p);
109 static int mdevcioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p);
110 static int mdevrw(dev_t dev, struct uio *uio, int ioflag);
111
112 #ifdef CONFIG_MEMDEV_INSECURE
113 static char * nonspace(char *pos, char *end);
114 static char * getspace(char *pos, char *end);
115 static char * cvtnum(char *pos, char *end, uint64_t *num);
116 #endif /* CONFIG_MEMDEV_INSECURE */
117
118 extern void bcopy_phys(addr64_t from, addr64_t to, vm_size_t bytes);
119 extern void mapping_set_mod(ppnum_t pn);
120 extern ppnum_t pmap_find_phys(pmap_t pmap, addr64_t va);
121
122 /*
123 * Maximal number of memory devices.
124 */
125 #define NB_MAX_MDEVICES (16)
126
127 /*
128 * cdevsw
129 * D_DISK we want to look like a disk
130 * D_CANFREE We support B_FREEBUF
131 */
132
133 static const struct bdevsw mdevbdevsw = {
134 .d_open = mdevopen,
135 .d_close = mdevclose,
136 .d_strategy = mdevstrategy,
137 .d_ioctl = mdevbioctl,
138 .d_dump = eno_dump,
139 .d_psize = mdevsize,
140 .d_type = D_DISK,
141 };
142
143 static const struct cdevsw mdevcdevsw = {
144 .d_open = mdevopen,
145 .d_close = mdevclose,
146 .d_read = mdevrw,
147 .d_write = mdevrw,
148 .d_ioctl = mdevcioctl,
149 .d_stop = eno_stop,
150 .d_reset = eno_reset,
151 .d_ttys = NULL,
152 .d_select = eno_select,
153 .d_mmap = eno_mmap,
154 .d_strategy = eno_strat,
155 .d_reserved_1 = eno_getc,
156 .d_reserved_2 = eno_putc,
157 .d_type = D_DISK,
158 };
159
160 struct mdev {
161 uint64_t mdBase; /* base page number (pages are assumed to be 4K). Multiply by 4096 to find actual address */
162 uint32_t mdSize; /* size in pages (pages are assumed to be 4K). Multiply by 4096 to find actual size. */
163 int mdFlags; /* flags */
164 int mdSecsize; /* sector size */
165 int mdBDev; /* Block device number */
166 int mdCDev; /* Character device number */
167 void * mdbdevb;
168 void * mdcdevb;
169 } mdev[NB_MAX_MDEVICES];
170
171 /* mdFlags */
172 #define mdInited 0x01 /* This device defined */
173 #define mdRO 0x02 /* This device is read-only */
174 #define mdPhys 0x04 /* This device is in physical memory */
175
176 int mdevBMajor = -1;
177 int mdevCMajor = -1;
178
179 static int mdevioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p, int is_char);
180 dev_t mdevadd(int devid, uint64_t base, unsigned int size, int phys);
181 dev_t mdevlookup(int devid);
182 void mdevremoveall(void);
183 int mdevgetrange(int devid, uint64_t *base, uint64_t *size);
184
185 static int
mdevclose(__unused dev_t dev,__unused int flags,__unused int devtype,__unused struct proc * p)186 mdevclose(__unused dev_t dev, __unused int flags,
187 __unused int devtype, __unused struct proc *p)
188 {
189 return 0;
190 }
191
192 static int
mdevopen(dev_t dev,int flags,__unused int devtype,__unused struct proc * p)193 mdevopen(dev_t dev, int flags, __unused int devtype, __unused struct proc *p)
194 {
195 int devid;
196
197 devid = minor(dev); /* Get minor device number */
198
199 if (devid >= NB_MAX_MDEVICES || devid < 0) {
200 return ENXIO; /* Not valid */
201 }
202 if ((flags & FWRITE) && (mdev[devid].mdFlags & mdRO)) {
203 return EACCES; /* Currently mounted RO */
204 }
205 return 0;
206 }
207
208 static int
mdevrw(dev_t dev,struct uio * uio,__unused int ioflag)209 mdevrw(dev_t dev, struct uio *uio, __unused int ioflag)
210 {
211 int status;
212 addr64_t mdata;
213 int devid;
214 enum uio_seg saveflag;
215 int count;
216
217 devid = minor(dev); /* Get minor device number */
218
219 if (devid >= NB_MAX_MDEVICES || devid < 0) {
220 return ENXIO; /* Not valid */
221 }
222 if (!(mdev[devid].mdFlags & mdInited)) {
223 return ENXIO; /* Have we actually been defined yet? */
224 }
225 if (uio->uio_offset < 0) {
226 return EINVAL; /* invalid offset */
227 }
228 if (uio_resid(uio) < 0) {
229 return EINVAL;
230 }
231 mdata = ((addr64_t)mdev[devid].mdBase << 12) + uio->uio_offset; /* Point to the area in "file" */
232
233 saveflag = uio->uio_segflg; /* Remember what the request is */
234 /* Make sure we are moving from physical ram if physical device */
235 if (mdev[devid].mdFlags & mdPhys) {
236 if (uio->uio_segflg == UIO_USERSPACE64) {
237 uio->uio_segflg = UIO_PHYS_USERSPACE64;
238 } else if (uio->uio_segflg == UIO_USERSPACE32) {
239 uio->uio_segflg = UIO_PHYS_USERSPACE32;
240 } else {
241 uio->uio_segflg = UIO_PHYS_USERSPACE;
242 }
243 }
244
245 if (uio->uio_offset > (mdev[devid].mdSize << 12)) {
246 count = 0;
247 } else {
248 count = imin(uio_resid(uio), (mdev[devid].mdSize << 12) - uio->uio_offset);
249 }
250
251 status = uiomove64(mdata, count, uio); /* Move the data */
252 uio->uio_segflg = saveflag; /* Restore the flag */
253
254 return status;
255 }
256
257 static void
mdevstrategy(struct buf * bp)258 mdevstrategy(struct buf *bp)
259 {
260 unsigned int left, lop, csize;
261 vm_offset_t vaddr, blkoff;
262 int devid;
263 addr64_t paddr, fvaddr;
264 ppnum_t pp;
265
266 devid = minor(buf_device(bp)); /* Get minor device number */
267
268 if ((mdev[devid].mdFlags & mdInited) == 0) { /* Have we actually been defined yet? */
269 buf_seterror(bp, ENXIO);
270 buf_biodone(bp);
271 return;
272 }
273
274 buf_setresid(bp, buf_count(bp)); /* Set byte count */
275
276 blkoff = buf_blkno(bp) * mdev[devid].mdSecsize; /* Get offset into file */
277
278 /*
279 * Note that reading past end is an error, but reading at end is an EOF. For these
280 * we just return with resid == count.
281 */
282
283 if (blkoff >= (mdev[devid].mdSize << 12)) { /* Are they trying to read/write at/after end? */
284 if (blkoff != (mdev[devid].mdSize << 12)) { /* Are we trying to read after EOF? */
285 buf_seterror(bp, EINVAL); /* Yeah, this is an error */
286 }
287 buf_biodone(bp); /* Return */
288 return;
289 }
290
291 if ((blkoff + buf_count(bp)) > (mdev[devid].mdSize << 12)) { /* Will this read go past end? */
292 buf_setcount(bp, (uint32_t)((mdev[devid].mdSize << 12) - blkoff)); /* Yes, trim to max */
293 }
294 /*
295 * make sure the buffer's data area is
296 * accessible
297 */
298 if (buf_map(bp, (caddr_t *)&vaddr)) {
299 panic("ramstrategy: buf_map failed");
300 }
301
302 fvaddr = (mdev[devid].mdBase << 12) + blkoff; /* Point to offset into ram disk */
303
304 if (buf_flags(bp) & B_READ) { /* Is this a read? */
305 if (!(mdev[devid].mdFlags & mdPhys)) { /* Physical mapped disk? */
306 bcopy((void *)((uintptr_t)fvaddr),
307 (void *)vaddr, (size_t)buf_count(bp)); /* This is virtual, just get the data */
308 } else {
309 left = buf_count(bp); /* Init the amount left to copy */
310 while (left) { /* Go until it is all copied */
311 lop = min((4096 - (vaddr & 4095)), (4096 - (fvaddr & 4095))); /* Get smallest amount left on sink and source */
312 csize = min(lop, left); /* Don't move more than we need to */
313
314 pp = pmap_find_phys(kernel_pmap, (addr64_t)((uintptr_t)vaddr)); /* Get the sink physical address */
315 if (!pp) { /* Not found, what gives? */
316 panic("mdevstrategy: sink address %016llX not mapped", (addr64_t)((uintptr_t)vaddr));
317 }
318 paddr = (addr64_t)(((addr64_t)pp << 12) | (addr64_t)(vaddr & 4095)); /* Get actual address */
319 bcopy_phys(fvaddr, paddr, csize); /* Copy this on in */
320 mapping_set_mod((ppnum_t)(paddr >> 12)); /* Make sure we know that it is modified */
321
322 left = left - csize; /* Calculate what is left */
323 vaddr = vaddr + csize; /* Move to next sink address */
324 fvaddr = fvaddr + csize; /* Bump to next physical address */
325 }
326 }
327 } else { /* This is a write */
328 if (!(mdev[devid].mdFlags & mdPhys)) { /* Physical mapped disk? */
329 bcopy((void *)vaddr, (void *)((uintptr_t)fvaddr),
330 (size_t)buf_count(bp)); /* This is virtual, just put the data */
331 } else {
332 left = buf_count(bp); /* Init the amount left to copy */
333 while (left) { /* Go until it is all copied */
334 lop = min((4096 - (vaddr & 4095)), (4096 - (fvaddr & 4095))); /* Get smallest amount left on sink and source */
335 csize = min(lop, left); /* Don't move more than we need to */
336
337 pp = pmap_find_phys(kernel_pmap, (addr64_t)((uintptr_t)vaddr)); /* Get the source physical address */
338 if (!pp) { /* Not found, what gives? */
339 panic("mdevstrategy: source address %016llX not mapped", (addr64_t)((uintptr_t)vaddr));
340 }
341 paddr = (addr64_t)(((addr64_t)pp << 12) | (addr64_t)(vaddr & 4095)); /* Get actual address */
342
343 bcopy_phys(paddr, fvaddr, csize); /* Move this on out */
344
345 left = left - csize; /* Calculate what is left */
346 vaddr = vaddr + csize; /* Move to next sink address */
347 fvaddr = fvaddr + csize; /* Bump to next physical address */
348 }
349 }
350 }
351 /*
352 * buf_unmap takes care of all the cases
353 * it will unmap the buffer from kernel
354 * virtual space if that was the state
355 * when we mapped it.
356 */
357 buf_unmap(bp);
358
359 buf_setresid(bp, 0); /* Nothing more to do */
360 buf_biodone(bp); /* Say we've finished */
361 }
362
363 static int
mdevbioctl(dev_t dev,u_long cmd,caddr_t data,int flag,struct proc * p)364 mdevbioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
365 {
366 return mdevioctl(dev, cmd, data, flag, p, 0);
367 }
368
369 static int
mdevcioctl(dev_t dev,u_long cmd,caddr_t data,int flag,struct proc * p)370 mdevcioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
371 {
372 return mdevioctl(dev, cmd, data, flag, p, 1);
373 }
374
375 static int
mdevioctl(dev_t dev,u_long cmd,caddr_t data,__unused int flag,struct proc * p,int is_char)376 mdevioctl(dev_t dev, u_long cmd, caddr_t data, __unused int flag,
377 struct proc *p, int is_char)
378 {
379 int error;
380 u_int32_t *f;
381 u_int64_t *o;
382 int devid;
383 dk_memdev_info_t * memdev_info;
384
385 devid = minor(dev); /* Get minor device number */
386
387 if (devid >= NB_MAX_MDEVICES || devid < 0) {
388 return ENXIO; /* Not valid */
389 }
390 error = proc_suser(p); /* Are we superman? */
391 if (error) {
392 return error; /* Nope... */
393 }
394 f = (u_int32_t*)data;
395 o = (u_int64_t *)data;
396 memdev_info = (dk_memdev_info_t *) data;
397
398 switch (cmd) {
399 case DKIOCGETMAXBLOCKCOUNTREAD:
400 *o = 32;
401 break;
402
403 case DKIOCGETMAXBLOCKCOUNTWRITE:
404 *o = 32;
405 break;
406
407 case DKIOCGETMAXSEGMENTCOUNTREAD:
408 *o = 32;
409 break;
410
411 case DKIOCGETMAXSEGMENTCOUNTWRITE:
412 *o = 32;
413 break;
414
415 case DKIOCGETBLOCKSIZE:
416 *f = mdev[devid].mdSecsize;
417 break;
418
419 case DKIOCSETBLOCKSIZE:
420 if (is_char) {
421 return ENODEV; /* We can only do this for a block */
422 }
423 if (*f < DEV_BSIZE) {
424 return EINVAL; /* Too short? */
425 }
426 mdev[devid].mdSecsize = *f; /* set the new block size */
427 break;
428
429 case DKIOCISWRITABLE:
430 *f = 1;
431 break;
432
433 case DKIOCGETBLOCKCOUNT:
434 if (!(mdev[devid].mdFlags & mdInited)) {
435 return ENXIO;
436 }
437 *o = ((mdev[devid].mdSize << 12) + mdev[devid].mdSecsize - 1) / mdev[devid].mdSecsize;
438 break;
439
440 /*
441 * We're interested in the following bits of information:
442 * Are you a memory-backed device (always yes, in this case)?
443 * Physical memory (mdPhys)?
444 * What is your base page?
445 * What is your size?
446 */
447 case DKIOCGETMEMDEVINFO:
448 if (!(mdev[devid].mdFlags & mdInited)) {
449 return ENXIO;
450 }
451 memdev_info->mi_mdev = TRUE;
452 memdev_info->mi_phys = (mdev[devid].mdFlags & mdPhys) ? TRUE : FALSE;
453 memdev_info->mi_base = (uint32_t)mdev[devid].mdBase;
454 memdev_info->mi_size = mdev[devid].mdSize;
455 break;
456
457 default:
458 error = ENOTTY;
459 break;
460 }
461 return error;
462 }
463
464
465 static int
mdevsize(dev_t dev)466 mdevsize(dev_t dev)
467 {
468 int devid;
469
470 devid = minor(dev); /* Get minor device number */
471 if (devid >= NB_MAX_MDEVICES || devid < 0) {
472 return ENXIO; /* Not valid */
473 }
474 if ((mdev[devid].mdFlags & mdInited) == 0) {
475 return -1; /* Not inited yet */
476 }
477 return mdev[devid].mdSecsize;
478 }
479
480 #include <pexpert/pexpert.h>
481
482 void
mdevinit(__unused int the_cnt)483 mdevinit(__unused int the_cnt)
484 {
485 #ifdef CONFIG_MEMDEV_INSECURE
486
487 int devid, phys;
488 uint64_t base;
489 uint64_t size;
490 char *ba, *lp;
491 dev_t dev;
492
493
494 ba = PE_boot_args(); /* Get the boot arguments */
495 lp = ba + 256; /* Point to the end */
496
497 while (1) { /* Step through, looking for our keywords */
498 phys = 0; /* Assume virtual memory device */
499 ba = nonspace(ba, lp); /* Find non-space */
500 if (ba >= lp) {
501 return; /* We are done if no more... */
502 }
503 if (((ba[0] != 'v') && (ba[0] != 'p'))
504 || (ba[1] != 'm') || (ba[2] != 'd') || (ba[4] != '=')
505 || (ba[3] < '0') || (ba[3] > 'f')
506 || ((ba[3] > '9') && (ba[3] < 'a'))) { /* Is this of form "vmdx=" or "pmdx=" where x is hex digit? */
507 ba = getspace(ba, lp); /* Find next white space or end */
508 continue; /* Start looking for the next one */
509 }
510
511 if (ba[0] == 'p') {
512 phys = 1; /* Set physical memory disk */
513 }
514 devid = ba[3] & 0xF; /* Assume digit */
515 if (ba[3] > '9') {
516 devid += 9; /* Adjust for hex digits */
517 }
518 ba = &ba[5]; /* Step past keyword */
519 ba = cvtnum(ba, lp, &base); /* Convert base of memory disk */
520 if (ba >= lp) {
521 return; /* Malformed one at the end, leave */
522 }
523 if (ba[0] != '.') {
524 continue; /* If not length separater, try next... */
525 }
526 if (base & 0xFFF) {
527 continue; /* Only allow page aligned stuff */
528 }
529 ba++; /* Step past '.' */
530 ba = cvtnum(ba, lp, &size); /* Try to convert it */
531 if (!size || (size & 0xFFF)) {
532 continue; /* Allow only non-zer page size multiples */
533 }
534 if (ba < lp) { /* If we are not at end, check end character */
535 if ((ba[0] != ' ') && (ba[0] != 0)) {
536 continue; /* End must be null or space */
537 }
538 }
539
540 dev = mdevadd(devid, base >> 12, (unsigned)size >> 12, phys); /* Go add the device */
541 }
542
543 #endif /* CONFIG_MEMDEV_INSECURE */
544
545 return;
546 }
547
548 #ifdef CONFIG_MEMDEV_INSECURE
549
550 char *
nonspace(char * pos,char * end)551 nonspace(char *pos, char *end) /* Find next non-space in string */
552 {
553 if (pos >= end) {
554 return end; /* Don't go past end */
555 }
556 if (pos[0] == 0) {
557 return end; /* If at null, make end */
558 }
559 while (1) { /* Keep going */
560 if (pos[0] != ' ') {
561 return pos; /* Leave if we found one */
562 }
563 pos++; /* Stop */
564 if (pos >= end) {
565 return end; /* Quit if we run off end */
566 }
567 }
568 }
569
570 char *
getspace(char * pos,char * end)571 getspace(char *pos, char *end) /* Find next non-space in string */
572 {
573 while (1) { /* Keep going */
574 if (pos >= end) {
575 return end; /* Don't go past end */
576 }
577 if (pos[0] == 0) {
578 return end; /* Leave if we hit null */
579 }
580 if (pos[0] == ' ') {
581 return pos; /* Leave if we found one */
582 }
583 pos++; /* Stop */
584 }
585 }
586
587 char *
cvtnum(char * pos,char * end,uint64_t * num)588 cvtnum(char *pos, char *end, uint64_t *num) /* Convert to a number */
589 {
590 int rad, dig;
591
592 *num = 0; /* Set answer to 0 to start */
593 rad = 10;
594
595 if (pos >= end) {
596 return end; /* Don't go past end */
597 }
598 if (pos[0] == 0) {
599 return end; /* If at null, make end */
600 }
601 if (pos[0] == '0' && ((pos[1] == 'x') || (pos[1] == 'x'))) { /* A hex constant? */
602 rad = 16;
603 pos += 2; /* Point to the number */
604 }
605
606 while (1) { /* Convert it */
607 if (pos >= end) {
608 return end; /* Don't go past end */
609 }
610 if (pos[0] == 0) {
611 return end; /* If at null, make end */
612 }
613 if (pos[0] < '0') {
614 return pos; /* Leave if non-digit */
615 }
616 dig = pos[0] & 0xF; /* Extract digit */
617 if (pos[0] > '9') { /* Is it bigger than 9? */
618 if (rad == 10) {
619 return pos; /* Leave if not base 10 */
620 }
621 if (!(((pos[0] >= 'A') && (pos[0] <= 'F'))
622 || ((pos[0] >= 'a') && (pos[0] <= 'f')))) {
623 return pos; /* Leave if bogus char */
624 }
625 dig = dig + 9; /* Adjust for character */
626 }
627 *num = (*num * rad) + dig; /* Accumulate the number */
628 pos++; /* Step on */
629 }
630 }
631
632 #endif /* CONFIG_MEMDEV_INSECURE */
633
634 dev_t
mdevadd(int devid,uint64_t base,unsigned int size,int phys)635 mdevadd(int devid, uint64_t base, unsigned int size, int phys)
636 {
637 int i;
638
639 if (devid < 0) {
640 devid = -1;
641 for (i = 0; i < NB_MAX_MDEVICES; i++) { /* Search all known memory devices */
642 if (!(mdev[i].mdFlags & mdInited)) { /* Is this a free one? */
643 if (devid < 0) {
644 devid = i; /* Remember first free one */
645 }
646 continue; /* Skip check */
647 }
648 if (!(((base + size - 1) < mdev[i].mdBase) || ((mdev[i].mdBase + mdev[i].mdSize - 1) < base))) { /* Is there any overlap? */
649 panic("mdevadd: attempt to add overlapping memory device at %016llX-%016llX", mdev[i].mdBase, mdev[i].mdBase + mdev[i].mdSize - 1);
650 }
651 }
652 if (devid < 0) { /* Do we have free slots? */
653 panic("mdevadd: attempt to add more than %d memory devices", NB_MAX_MDEVICES);
654 }
655 } else {
656 if (devid >= NB_MAX_MDEVICES) { /* Giving us something bogus? */
657 panic("mdevadd: attempt to explicitly add a bogus memory device: %08X", devid);
658 }
659 if (mdev[devid].mdFlags & mdInited) { /* Already there? */
660 panic("mdevadd: attempt to explicitly add a previously defined memory device: %08X", devid);
661 }
662 }
663
664 if (mdevBMajor < 0) { /* Have we gotten a major number yet? */
665 mdevBMajor = bdevsw_add(-1, &mdevbdevsw); /* Add to the table and figure out a major number */
666 if (mdevBMajor < 0) {
667 printf("mdevadd: error - bdevsw_add() returned %d\n", mdevBMajor);
668 return -1;
669 }
670 }
671
672 if (mdevCMajor < 0) { /* Have we gotten a major number yet? */
673 mdevCMajor = cdevsw_add_with_bdev(-1, &mdevcdevsw, mdevBMajor); /* Add to the table and figure out a major number */
674 if (mdevCMajor < 0) {
675 printf("ramdevice_init: error - cdevsw_add() returned %d\n", mdevCMajor);
676 return -1;
677 }
678 }
679
680 mdev[devid].mdBDev = makedev(mdevBMajor, devid); /* Get the device number */
681 mdev[devid].mdbdevb = devfs_make_node(mdev[devid].mdBDev, DEVFS_BLOCK, /* Make the node */
682 UID_ROOT, GID_OPERATOR,
683 0600, "md%d", devid);
684 if (mdev[devid].mdbdevb == NULL) { /* Did we make one? */
685 printf("mdevadd: devfs_make_node for block failed!\n");
686 return -1; /* Nope... */
687 }
688
689 mdev[devid].mdCDev = makedev(mdevCMajor, devid); /* Get the device number */
690 mdev[devid].mdcdevb = devfs_make_node(mdev[devid].mdCDev, DEVFS_CHAR, /* Make the node */
691 UID_ROOT, GID_OPERATOR,
692 0600, "rmd%d", devid);
693 if (mdev[devid].mdcdevb == NULL) { /* Did we make one? */
694 printf("mdevadd: devfs_make_node for character failed!\n");
695 return -1; /* Nope... */
696 }
697
698 mdev[devid].mdBase = base; /* Set the base address of ram disk */
699 mdev[devid].mdSize = size; /* Set the length of the ram disk */
700 mdev[devid].mdSecsize = DEV_BSIZE; /* Set starting block size */
701 if (phys) {
702 mdev[devid].mdFlags |= mdPhys; /* Show that we are in physical memory */
703 }
704 mdev[devid].mdFlags |= mdInited; /* Show we are all set up */
705 printf("Added memory device md%x/rmd%x (%08X/%08X) at %016llX for %016llX\n",
706 devid, devid, mdev[devid].mdBDev, mdev[devid].mdCDev, base << 12, (uint64_t)size << 12);
707 return mdev[devid].mdBDev;
708 }
709
710
711 dev_t
mdevlookup(int devid)712 mdevlookup(int devid)
713 {
714 if ((devid < 0) || (devid >= NB_MAX_MDEVICES)) {
715 return -1; /* Filter any bogus requests */
716 }
717 if (!(mdev[devid].mdFlags & mdInited)) {
718 return -1; /* This one hasn't been defined */
719 }
720 return mdev[devid].mdBDev; /* Return the device number */
721 }
722
723 void
mdevremoveall(void)724 mdevremoveall(void)
725 {
726 int i;
727
728 for (i = 0; i < NB_MAX_MDEVICES; i++) {
729 if (!(mdev[i].mdFlags & mdInited)) {
730 continue; /* Ignore unused mdevs */
731 }
732 devfs_remove(mdev[i].mdbdevb); /* Remove the block device */
733 devfs_remove(mdev[i].mdcdevb); /* Remove the character device */
734
735 mdev[i].mdBase = 0; /* Clear the mdev's storage */
736 mdev[i].mdSize = 0;
737 mdev[i].mdSecsize = 0;
738 mdev[i].mdFlags = 0;
739 mdev[i].mdBDev = 0;
740 mdev[i].mdCDev = 0;
741 mdev[i].mdbdevb = 0;
742 mdev[i].mdcdevb = 0;
743 }
744 }
745
746 int
mdevgetrange(int devid,uint64_t * base,uint64_t * size)747 mdevgetrange(int devid, uint64_t *base, uint64_t *size)
748 {
749 assert(base);
750 assert(size);
751
752 /* filter invalid request */
753 if ((devid < 0) || (devid >= NB_MAX_MDEVICES)) {
754 return -1;
755 }
756
757 /* filter non-initialized memory devices */
758 if ((mdev[devid].mdFlags & mdInited) == 0) {
759 return -1;
760 }
761
762 *base = mdev[devid].mdBase << 12;
763 *size = mdev[devid].mdSize << 12;
764
765 /* make sure (base, size) is a valid range and will not overflow */
766 assert(*size < (UINT64_MAX - *base));
767
768 return 0;
769 }
770