1 /*-
2 * Copyright (c) 2003 Peter Wemm.
3 * Copyright (c) 1990 The Regents of the University of California.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 4. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * from: @(#)sys_machdep.c 5.5 (Berkeley) 1/19/91
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD: releng/8.2/sys/amd64/amd64/sys_machdep.c 202421 2010-01-15 22:19:51Z kib $");
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/lock.h>
39 #include <sys/malloc.h>
40 #include <sys/mutex.h>
41 #include <sys/priv.h>
42 #include <sys/proc.h>
43 #include <sys/sysproto.h>
44 #include <sys/uio.h>
45
46 #include <vm/vm.h>
47 #include <vm/pmap.h>
48 #include <vm/vm_kern.h> /* for kernel_map */
49 #include <vm/vm_extern.h>
50
51 #include <machine/frame.h>
52 #include <machine/md_var.h>
53 #include <machine/pcb.h>
54 #include <machine/specialreg.h>
55 #include <machine/sysarch.h>
56 #include <machine/tss.h>
57 #include <machine/vmparam.h>
58
59 #include <security/audit/audit.h>
60
61 int max_ldt_segment = 1024;
62 #define LD_PER_PAGE 512
63 #define NULL_LDT_BASE ((caddr_t)NULL)
64
65 #ifdef notyet
66 #ifdef SMP
67 static void set_user_ldt_rv(struct vmspace *vmsp);
68 #endif
69 #endif
70 static void user_ldt_derefl(struct proc_ldt *pldt);
71
72 #ifndef _SYS_SYSPROTO_H_
73 struct sysarch_args {
74 int op;
75 char *parms;
76 };
77 #endif
78
79 int
80 sysarch_ldt(struct thread *td, struct sysarch_args *uap, int uap_space)
81 {
82 struct i386_ldt_args *largs, la;
83 struct user_segment_descriptor *lp;
84 int error = 0;
85
86 /*
87 * XXXKIB check that the BSM generation code knows to encode
88 * the op argument.
89 */
90 AUDIT_ARG_CMD(uap->op);
91 if (uap_space == UIO_USERSPACE) {
92 error = copyin(uap->parms, &la, sizeof(struct i386_ldt_args));
93 if (error != 0)
94 return (error);
95 largs = &la;
96 } else
97 largs = (struct i386_ldt_args *)uap->parms;
98 if (largs->num > max_ldt_segment || largs->num <= 0)
99 return (EINVAL);
100
101 switch (uap->op) {
102 case I386_GET_LDT:
103 error = amd64_get_ldt(td, largs);
104 break;
105 case I386_SET_LDT:
106 td->td_pcb->pcb_full_iret = 1;
107 if (largs->descs != NULL) {
108 lp = (struct user_segment_descriptor *)
109 kmem_alloc(kernel_map, largs->num *
110 sizeof(struct user_segment_descriptor));
111 if (lp == NULL) {
112 error = ENOMEM;
113 break;
114 }
115 error = copyin(largs->descs, lp, largs->num *
116 sizeof(struct user_segment_descriptor));
117 if (error == 0)
118 error = amd64_set_ldt(td, largs, lp);
119 kmem_free(kernel_map, (vm_offset_t)lp, largs->num *
120 sizeof(struct user_segment_descriptor));
121 } else {
122 error = amd64_set_ldt(td, largs, NULL);
123 }
124 break;
125 }
126 return (error);
127 }
128
129 void
130 update_gdt_gsbase(struct thread *td, uint32_t base)
131 {
132 struct user_segment_descriptor *sd;
133
134 if (td != curthread)
135 return;
136 td->td_pcb->pcb_full_iret = 1;
137 critical_enter();
138 sd = PCPU_GET(gs32p);
139 sd->sd_lobase = base & 0xffffff;
140 sd->sd_hibase = (base >> 24) & 0xff;
141 critical_exit();
142 }
143
144 void
145 update_gdt_fsbase(struct thread *td, uint32_t base)
146 {
147 struct user_segment_descriptor *sd;
148
149 if (td != curthread)
150 return;
151 td->td_pcb->pcb_full_iret = 1;
152 critical_enter();
153 sd = PCPU_GET(fs32p);
154 sd->sd_lobase = base & 0xffffff;
155 sd->sd_hibase = (base >> 24) & 0xff;
156 critical_exit();
157 }
158
159 int
160 sysarch(td, uap)
161 struct thread *td;
162 register struct sysarch_args *uap;
163 {
164 int error = 0;
165 struct pcb *pcb = curthread->td_pcb;
166 uint32_t i386base;
167 uint64_t a64base;
168 struct i386_ioperm_args iargs;
169
170 if (uap->op == I386_GET_LDT || uap->op == I386_SET_LDT)
171 return (sysarch_ldt(td, uap, UIO_USERSPACE));
172 /*
173 * XXXKIB check that the BSM generation code knows to encode
174 * the op argument.
175 */
176 AUDIT_ARG_CMD(uap->op);
177 switch (uap->op) {
178 case I386_GET_IOPERM:
179 case I386_SET_IOPERM:
180 if ((error = copyin(uap->parms, &iargs,
181 sizeof(struct i386_ioperm_args))) != 0)
182 return (error);
183 break;
184 default:
185 break;
186 }
187
188 switch (uap->op) {
189 case I386_GET_IOPERM:
190 error = amd64_get_ioperm(td, &iargs);
191 if (error == 0)
192 error = copyout(&iargs, uap->parms,
193 sizeof(struct i386_ioperm_args));
194 break;
195 case I386_SET_IOPERM:
196 error = amd64_set_ioperm(td, &iargs);
197 break;
198 case I386_GET_FSBASE:
199 i386base = pcb->pcb_fsbase;
200 error = copyout(&i386base, uap->parms, sizeof(i386base));
201 break;
202 case I386_SET_FSBASE:
203 error = copyin(uap->parms, &i386base, sizeof(i386base));
204 if (!error) {
205 pcb->pcb_fsbase = i386base;
206 td->td_frame->tf_fs = _ufssel;
207 pcb->pcb_full_iret = 1;
208 update_gdt_fsbase(td, i386base);
209 }
210 break;
211 case I386_GET_GSBASE:
212 i386base = pcb->pcb_gsbase;
213 error = copyout(&i386base, uap->parms, sizeof(i386base));
214 break;
215 case I386_SET_GSBASE:
216 error = copyin(uap->parms, &i386base, sizeof(i386base));
217 if (!error) {
218 pcb->pcb_gsbase = i386base;
219 pcb->pcb_full_iret = 1;
220 td->td_frame->tf_gs = _ugssel;
221 update_gdt_gsbase(td, i386base);
222 }
223 break;
224 case AMD64_GET_FSBASE:
225 error = copyout(&pcb->pcb_fsbase, uap->parms, sizeof(pcb->pcb_fsbase));
226 break;
227
228 case AMD64_SET_FSBASE:
229 error = copyin(uap->parms, &a64base, sizeof(a64base));
230 if (!error) {
231 if (a64base < VM_MAXUSER_ADDRESS) {
232 pcb->pcb_fsbase = a64base;
233 pcb->pcb_full_iret = 1;
234 td->td_frame->tf_fs = _ufssel;
235 } else
236 error = EINVAL;
237 }
238 break;
239
240 case AMD64_GET_GSBASE:
241 error = copyout(&pcb->pcb_gsbase, uap->parms, sizeof(pcb->pcb_gsbase));
242 break;
243
244 case AMD64_SET_GSBASE:
245 error = copyin(uap->parms, &a64base, sizeof(a64base));
246 if (!error) {
247 if (a64base < VM_MAXUSER_ADDRESS) {
248 pcb->pcb_gsbase = a64base;
249 pcb->pcb_full_iret = 1;
250 td->td_frame->tf_gs = _ugssel;
251 } else
252 error = EINVAL;
253 }
254 break;
255
256 default:
257 error = EINVAL;
258 break;
259 }
260 return (error);
261 }
262
263 int
264 amd64_set_ioperm(td, uap)
265 struct thread *td;
266 struct i386_ioperm_args *uap;
267 {
268 int i, error;
269 char *iomap;
270 struct amd64tss *tssp;
271 struct system_segment_descriptor *tss_sd;
272 u_long *addr;
273 struct pcb *pcb;
274
275 if ((error = priv_check(td, PRIV_IO)) != 0)
276 return (error);
277 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
278 return (error);
279 if (uap->start + uap->length > IOPAGES * PAGE_SIZE * NBBY)
280 return (EINVAL);
281
282 /*
283 * XXX
284 * While this is restricted to root, we should probably figure out
285 * whether any other driver is using this i/o address, as so not to
286 * cause confusion. This probably requires a global 'usage registry'.
287 */
288 pcb = td->td_pcb;
289 if (pcb->pcb_tssp == NULL) {
290 tssp = (struct amd64tss *)kmem_alloc(kernel_map,
291 ctob(IOPAGES+1));
292 if (tssp == NULL)
293 return (ENOMEM);
294 iomap = (char *)&tssp[1];
295 addr = (u_long *)iomap;
296 for (i = 0; i < (ctob(IOPAGES) + 1) / sizeof(u_long); i++)
297 *addr++ = ~0;
298 critical_enter();
299 /* Takes care of tss_rsp0. */
300 memcpy(tssp, &common_tss[PCPU_GET(cpuid)],
301 sizeof(struct amd64tss));
302 tssp->tss_iobase = sizeof(*tssp);
303 pcb->pcb_tssp = tssp;
304 tss_sd = PCPU_GET(tss);
305 tss_sd->sd_lobase = (u_long)tssp & 0xffffff;
306 tss_sd->sd_hibase = ((u_long)tssp >> 24) & 0xfffffffffful;
307 tss_sd->sd_type = SDT_SYSTSS;
308 ltr(GSEL(GPROC0_SEL, SEL_KPL));
309 PCPU_SET(tssp, tssp);
310 critical_exit();
311 } else
312 iomap = (char *)&pcb->pcb_tssp[1];
313 for (i = uap->start; i < uap->start + uap->length; i++) {
314 if (uap->enable)
315 iomap[i >> 3] &= ~(1 << (i & 7));
316 else
317 iomap[i >> 3] |= (1 << (i & 7));
318 }
319 return (error);
320 }
321
322 int
323 amd64_get_ioperm(td, uap)
324 struct thread *td;
325 struct i386_ioperm_args *uap;
326 {
327 int i, state;
328 char *iomap;
329
330 if (uap->start >= IOPAGES * PAGE_SIZE * NBBY)
331 return (EINVAL);
332 if (td->td_pcb->pcb_tssp == NULL) {
333 uap->length = 0;
334 goto done;
335 }
336
337 iomap = (char *)&td->td_pcb->pcb_tssp[1];
338
339 i = uap->start;
340 state = (iomap[i >> 3] >> (i & 7)) & 1;
341 uap->enable = !state;
342 uap->length = 1;
343
344 for (i = uap->start + 1; i < IOPAGES * PAGE_SIZE * NBBY; i++) {
345 if (state != ((iomap[i >> 3] >> (i & 7)) & 1))
346 break;
347 uap->length++;
348 }
349
350 done:
351 return (0);
352 }
353
354 /*
355 * Update the GDT entry pointing to the LDT to point to the LDT of the
356 * current process.
357 */
358 void
359 set_user_ldt(struct mdproc *mdp)
360 {
361
362 critical_enter();
363 *PCPU_GET(ldt) = mdp->md_ldt_sd;
364 lldt(GSEL(GUSERLDT_SEL, SEL_KPL));
365 critical_exit();
366 }
367
368 #ifdef notyet
369 #ifdef SMP
370 static void
371 set_user_ldt_rv(struct vmspace *vmsp)
372 {
373 struct thread *td;
374
375 td = curthread;
376 if (vmsp != td->td_proc->p_vmspace)
377 return;
378
379 set_user_ldt(&td->td_proc->p_md);
380 }
381 #endif
382 #endif
383
384 struct proc_ldt *
385 user_ldt_alloc(struct proc *p, int force)
386 {
387 struct proc_ldt *pldt, *new_ldt;
388 struct mdproc *mdp;
389 struct soft_segment_descriptor sldt;
390
391 mtx_assert(&dt_lock, MA_OWNED);
392 mdp = &p->p_md;
393 if (!force && mdp->md_ldt != NULL)
394 return (mdp->md_ldt);
395 mtx_unlock(&dt_lock);
396 new_ldt = malloc(sizeof(struct proc_ldt), M_SUBPROC, M_WAITOK);
397 new_ldt->ldt_base = (caddr_t)kmem_alloc(kernel_map,
398 max_ldt_segment * sizeof(struct user_segment_descriptor));
399 if (new_ldt->ldt_base == NULL) {
400 FREE(new_ldt, M_SUBPROC);
401 mtx_lock(&dt_lock);
402 return (NULL);
403 }
404 new_ldt->ldt_refcnt = 1;
405 sldt.ssd_base = (uint64_t)new_ldt->ldt_base;
406 sldt.ssd_limit = max_ldt_segment *
407 sizeof(struct user_segment_descriptor) - 1;
408 sldt.ssd_type = SDT_SYSLDT;
409 sldt.ssd_dpl = SEL_KPL;
410 sldt.ssd_p = 1;
411 sldt.ssd_long = 0;
412 sldt.ssd_def32 = 0;
413 sldt.ssd_gran = 0;
414 mtx_lock(&dt_lock);
415 pldt = mdp->md_ldt;
416 if (pldt != NULL && !force) {
417 kmem_free(kernel_map, (vm_offset_t)new_ldt->ldt_base,
418 max_ldt_segment * sizeof(struct user_segment_descriptor));
419 free(new_ldt, M_SUBPROC);
420 return (pldt);
421 }
422
423 if (pldt != NULL) {
424 bcopy(pldt->ldt_base, new_ldt->ldt_base, max_ldt_segment *
425 sizeof(struct user_segment_descriptor));
426 user_ldt_derefl(pldt);
427 }
428 ssdtosyssd(&sldt, &p->p_md.md_ldt_sd);
429 atomic_store_rel_ptr((volatile uintptr_t *)&mdp->md_ldt,
430 (uintptr_t)new_ldt);
431 if (p == curproc)
432 set_user_ldt(mdp);
433
434 return (mdp->md_ldt);
435 }
436
437 void
438 user_ldt_free(struct thread *td)
439 {
440 struct proc *p = td->td_proc;
441 struct mdproc *mdp = &p->p_md;
442 struct proc_ldt *pldt;
443
444 mtx_assert(&dt_lock, MA_OWNED);
445 if ((pldt = mdp->md_ldt) == NULL) {
446 mtx_unlock(&dt_lock);
447 return;
448 }
449
450 mdp->md_ldt = NULL;
451 bzero(&mdp->md_ldt_sd, sizeof(mdp->md_ldt_sd));
452 if (td == curthread)
453 lldt(GSEL(GNULL_SEL, SEL_KPL));
454 user_ldt_deref(pldt);
455 }
456
457 static void
458 user_ldt_derefl(struct proc_ldt *pldt)
459 {
460
461 if (--pldt->ldt_refcnt == 0) {
462 kmem_free(kernel_map, (vm_offset_t)pldt->ldt_base,
463 max_ldt_segment * sizeof(struct user_segment_descriptor));
464 free(pldt, M_SUBPROC);
465 }
466 }
467
468 void
469 user_ldt_deref(struct proc_ldt *pldt)
470 {
471
472 mtx_assert(&dt_lock, MA_OWNED);
473 user_ldt_derefl(pldt);
474 mtx_unlock(&dt_lock);
475 }
476
477 /*
478 * Note for the authors of compat layers (linux, etc): copyout() in
479 * the function below is not a problem since it presents data in
480 * arch-specific format (i.e. i386-specific in this case), not in
481 * the OS-specific one.
482 */
483 int
484 amd64_get_ldt(td, uap)
485 struct thread *td;
486 struct i386_ldt_args *uap;
487 {
488 int error = 0;
489 struct proc_ldt *pldt;
490 int num;
491 struct user_segment_descriptor *lp;
492
493 #ifdef DEBUG
494 printf("amd64_get_ldt: start=%d num=%d descs=%p\n",
495 uap->start, uap->num, (void *)uap->descs);
496 #endif
497
498 if ((pldt = td->td_proc->p_md.md_ldt) != NULL) {
499 lp = &((struct user_segment_descriptor *)(pldt->ldt_base))
500 [uap->start];
501 num = min(uap->num, max_ldt_segment);
502 } else
503 return (EINVAL);
504
505 if ((uap->start > (unsigned int)max_ldt_segment) ||
506 ((unsigned int)num > (unsigned int)max_ldt_segment) ||
507 ((unsigned int)(uap->start + num) > (unsigned int)max_ldt_segment))
508 return(EINVAL);
509
510 error = copyout(lp, uap->descs, num *
511 sizeof(struct user_segment_descriptor));
512 if (!error)
513 td->td_retval[0] = num;
514
515 return(error);
516 }
517
518 int
519 amd64_set_ldt(td, uap, descs)
520 struct thread *td;
521 struct i386_ldt_args *uap;
522 struct user_segment_descriptor *descs;
523 {
524 int error = 0, i;
525 int largest_ld;
526 struct mdproc *mdp = &td->td_proc->p_md;
527 struct proc_ldt *pldt;
528 struct user_segment_descriptor *dp;
529 struct proc *p;
530
531 #ifdef DEBUG
532 printf("amd64_set_ldt: start=%d num=%d descs=%p\n",
533 uap->start, uap->num, (void *)uap->descs);
534 #endif
535
536 td->td_pcb->pcb_full_iret = 1;
537 p = td->td_proc;
538 if (descs == NULL) {
539 /* Free descriptors */
540 if (uap->start == 0 && uap->num == 0)
541 uap->num = max_ldt_segment;
542 if (uap->num <= 0)
543 return (EINVAL);
544 if ((pldt = mdp->md_ldt) == NULL ||
545 uap->start >= max_ldt_segment)
546 return (0);
547 largest_ld = uap->start + uap->num;
548 if (largest_ld > max_ldt_segment)
549 largest_ld = max_ldt_segment;
550 i = largest_ld - uap->start;
551 mtx_lock(&dt_lock);
552 bzero(&((struct user_segment_descriptor *)(pldt->ldt_base))
553 [uap->start], sizeof(struct user_segment_descriptor) * i);
554 mtx_unlock(&dt_lock);
555 return (0);
556 }
557
558 if (!(uap->start == LDT_AUTO_ALLOC && uap->num == 1)) {
559 /* verify range of descriptors to modify */
560 largest_ld = uap->start + uap->num;
561 if (uap->start >= max_ldt_segment ||
562 uap->num < 0 || largest_ld > max_ldt_segment)
563 return (EINVAL);
564 }
565
566 /* Check descriptors for access violations */
567 for (i = 0; i < uap->num; i++) {
568 dp = &descs[i];
569
570 switch (dp->sd_type) {
571 case SDT_SYSNULL: /* system null */
572 dp->sd_p = 0;
573 break;
574 case SDT_SYS286TSS:
575 case SDT_SYSLDT:
576 case SDT_SYS286BSY:
577 case SDT_SYS286CGT:
578 case SDT_SYSTASKGT:
579 case SDT_SYS286IGT:
580 case SDT_SYS286TGT:
581 case SDT_SYSNULL2:
582 case SDT_SYSTSS:
583 case SDT_SYSNULL3:
584 case SDT_SYSBSY:
585 case SDT_SYSCGT:
586 case SDT_SYSNULL4:
587 case SDT_SYSIGT:
588 case SDT_SYSTGT:
589 /* I can't think of any reason to allow a user proc
590 * to create a segment of these types. They are
591 * for OS use only.
592 */
593 return (EACCES);
594 /*NOTREACHED*/
595
596 /* memory segment types */
597 case SDT_MEMEC: /* memory execute only conforming */
598 case SDT_MEMEAC: /* memory execute only accessed conforming */
599 case SDT_MEMERC: /* memory execute read conforming */
600 case SDT_MEMERAC: /* memory execute read accessed conforming */
601 /* Must be "present" if executable and conforming. */
602 if (dp->sd_p == 0)
603 return (EACCES);
604 break;
605 case SDT_MEMRO: /* memory read only */
606 case SDT_MEMROA: /* memory read only accessed */
607 case SDT_MEMRW: /* memory read write */
608 case SDT_MEMRWA: /* memory read write accessed */
609 case SDT_MEMROD: /* memory read only expand dwn limit */
610 case SDT_MEMRODA: /* memory read only expand dwn lim accessed */
611 case SDT_MEMRWD: /* memory read write expand dwn limit */
612 case SDT_MEMRWDA: /* memory read write expand dwn lim acessed */
613 case SDT_MEME: /* memory execute only */
614 case SDT_MEMEA: /* memory execute only accessed */
615 case SDT_MEMER: /* memory execute read */
616 case SDT_MEMERA: /* memory execute read accessed */
617 break;
618 default:
619 return(EINVAL);
620 /*NOTREACHED*/
621 }
622
623 /* Only user (ring-3) descriptors may be present. */
624 if ((dp->sd_p != 0) && (dp->sd_dpl != SEL_UPL))
625 return (EACCES);
626 }
627
628 if (uap->start == LDT_AUTO_ALLOC && uap->num == 1) {
629 /* Allocate a free slot */
630 mtx_lock(&dt_lock);
631 pldt = user_ldt_alloc(p, 0);
632 if (pldt == NULL) {
633 mtx_unlock(&dt_lock);
634 return (ENOMEM);
635 }
636
637 /*
638 * start scanning a bit up to leave room for NVidia and
639 * Wine, which still user the "Blat" method of allocation.
640 */
641 i = 16;
642 dp = &((struct user_segment_descriptor *)(pldt->ldt_base))[i];
643 for (; i < max_ldt_segment; ++i, ++dp) {
644 if (dp->sd_type == SDT_SYSNULL)
645 break;
646 }
647 if (i >= max_ldt_segment) {
648 mtx_unlock(&dt_lock);
649 return (ENOSPC);
650 }
651 uap->start = i;
652 error = amd64_set_ldt_data(td, i, 1, descs);
653 mtx_unlock(&dt_lock);
654 } else {
655 largest_ld = uap->start + uap->num;
656 if (largest_ld > max_ldt_segment)
657 return (EINVAL);
658 mtx_lock(&dt_lock);
659 if (user_ldt_alloc(p, 0) != NULL) {
660 error = amd64_set_ldt_data(td, uap->start, uap->num,
661 descs);
662 }
663 mtx_unlock(&dt_lock);
664 }
665 if (error == 0)
666 td->td_retval[0] = uap->start;
667 return (error);
668 }
669
670 int
671 amd64_set_ldt_data(struct thread *td, int start, int num,
672 struct user_segment_descriptor *descs)
673 {
674 struct mdproc *mdp = &td->td_proc->p_md;
675 struct proc_ldt *pldt = mdp->md_ldt;
676
677 mtx_assert(&dt_lock, MA_OWNED);
678
679 /* Fill in range */
680 bcopy(descs,
681 &((struct user_segment_descriptor *)(pldt->ldt_base))[start],
682 num * sizeof(struct user_segment_descriptor));
683 return (0);
684 }
Cache object: efa46cd7d1e716b248c8a4df5b72028b
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