1 /*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1982, 1986 The Regents of the University of California.
5 * Copyright (c) 1989, 1990 William Jolitz
6 * Copyright (c) 1994 John Dyson
7 * All rights reserved.
8 *
9 * This code is derived from software contributed to Berkeley by
10 * the Systems Programming Group of the University of Utah Computer
11 * Science Department, and William Jolitz.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. All advertising materials mentioning features or use of this software
22 * must display the following acknowledgement:
23 * This product includes software developed by the University of
24 * California, Berkeley and its contributors.
25 * 4. Neither the name of the University nor the names of its contributors
26 * may be used to endorse or promote products derived from this software
27 * without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * SUCH DAMAGE.
40 *
41 * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
42 * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
43 */
44
45 #include <sys/cdefs.h>
46 __FBSDID("$FreeBSD$");
47
48 #include "opt_isa.h"
49 #include "opt_npx.h"
50 #include "opt_reset.h"
51 #include "opt_cpu.h"
52
53 #include <sys/param.h>
54 #include <sys/systm.h>
55 #include <sys/bio.h>
56 #include <sys/buf.h>
57 #include <sys/kernel.h>
58 #include <sys/ktr.h>
59 #include <sys/lock.h>
60 #include <sys/malloc.h>
61 #include <sys/mbuf.h>
62 #include <sys/mutex.h>
63 #include <sys/pioctl.h>
64 #include <sys/proc.h>
65 #include <sys/sysent.h>
66 #include <sys/sf_buf.h>
67 #include <sys/smp.h>
68 #include <sys/sched.h>
69 #include <sys/sysctl.h>
70 #include <sys/unistd.h>
71 #include <sys/vnode.h>
72 #include <sys/vmmeter.h>
73
74 #include <machine/cpu.h>
75 #include <machine/cputypes.h>
76 #include <machine/md_var.h>
77 #include <machine/pcb.h>
78 #include <machine/pcb_ext.h>
79 #include <machine/smp.h>
80 #include <machine/vm86.h>
81
82 #include <vm/vm.h>
83 #include <vm/vm_extern.h>
84 #include <vm/vm_kern.h>
85 #include <vm/vm_page.h>
86 #include <vm/vm_map.h>
87 #include <vm/vm_param.h>
88
89 #ifndef NSFBUFS
90 #define NSFBUFS (512 + maxusers * 16)
91 #endif
92
93 _Static_assert(__OFFSETOF_MONITORBUF == offsetof(struct pcpu, pc_monitorbuf),
94 "__OFFSETOF_MONITORBUF does not correspond with offset of pc_monitorbuf.");
95
96 union savefpu *
97 get_pcb_user_save_td(struct thread *td)
98 {
99 vm_offset_t p;
100
101 p = td->td_kstack + td->td_kstack_pages * PAGE_SIZE -
102 roundup2(cpu_max_ext_state_size, XSAVE_AREA_ALIGN);
103 KASSERT((p % XSAVE_AREA_ALIGN) == 0, ("Unaligned pcb_user_save area"));
104 return ((union savefpu *)p);
105 }
106
107 union savefpu *
108 get_pcb_user_save_pcb(struct pcb *pcb)
109 {
110 vm_offset_t p;
111
112 p = (vm_offset_t)(pcb + 1);
113 return ((union savefpu *)p);
114 }
115
116 struct pcb *
117 get_pcb_td(struct thread *td)
118 {
119 vm_offset_t p;
120
121 p = td->td_kstack + td->td_kstack_pages * PAGE_SIZE -
122 roundup2(cpu_max_ext_state_size, XSAVE_AREA_ALIGN) -
123 sizeof(struct pcb);
124 return ((struct pcb *)p);
125 }
126
127 void *
128 alloc_fpusave(int flags)
129 {
130 void *res;
131 struct savefpu_ymm *sf;
132
133 res = malloc(cpu_max_ext_state_size, M_DEVBUF, flags);
134 if (use_xsave) {
135 sf = (struct savefpu_ymm *)res;
136 bzero(&sf->sv_xstate.sx_hd, sizeof(sf->sv_xstate.sx_hd));
137 sf->sv_xstate.sx_hd.xstate_bv = xsave_mask;
138 }
139 return (res);
140 }
141 /*
142 * Finish a fork operation, with process p2 nearly set up.
143 * Copy and update the pcb, set up the stack so that the child
144 * ready to run and return to user mode.
145 */
146 void
147 cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
148 {
149 struct proc *p1;
150 struct pcb *pcb2;
151 struct mdproc *mdp2;
152
153 p1 = td1->td_proc;
154 if ((flags & RFPROC) == 0) {
155 if ((flags & RFMEM) == 0) {
156 /* unshare user LDT */
157 struct mdproc *mdp1 = &p1->p_md;
158 struct proc_ldt *pldt, *pldt1;
159
160 mtx_lock_spin(&dt_lock);
161 if ((pldt1 = mdp1->md_ldt) != NULL &&
162 pldt1->ldt_refcnt > 1) {
163 pldt = user_ldt_alloc(mdp1, pldt1->ldt_len);
164 if (pldt == NULL)
165 panic("could not copy LDT");
166 mdp1->md_ldt = pldt;
167 set_user_ldt(mdp1);
168 user_ldt_deref(pldt1);
169 } else
170 mtx_unlock_spin(&dt_lock);
171 }
172 return;
173 }
174
175 /* Ensure that td1's pcb is up to date. */
176 if (td1 == curthread)
177 td1->td_pcb->pcb_gs = rgs();
178 critical_enter();
179 if (PCPU_GET(fpcurthread) == td1)
180 npxsave(td1->td_pcb->pcb_save);
181 critical_exit();
182
183 /* Point the pcb to the top of the stack */
184 pcb2 = get_pcb_td(td2);
185 td2->td_pcb = pcb2;
186
187 /* Copy td1's pcb */
188 bcopy(td1->td_pcb, pcb2, sizeof(*pcb2));
189
190 /* Properly initialize pcb_save */
191 pcb2->pcb_save = get_pcb_user_save_pcb(pcb2);
192 bcopy(get_pcb_user_save_td(td1), get_pcb_user_save_pcb(pcb2),
193 cpu_max_ext_state_size);
194
195 /* Reset debug registers in the new process */
196 x86_clear_dbregs(pcb2);
197
198 /* Point mdproc and then copy over td1's contents */
199 mdp2 = &p2->p_md;
200 bcopy(&p1->p_md, mdp2, sizeof(*mdp2));
201
202 /*
203 * Create a new fresh stack for the new process.
204 * Copy the trap frame for the return to user mode as if from a
205 * syscall. This copies most of the user mode register values.
206 * The -VM86_STACK_SPACE (-16) is so we can expand the trapframe
207 * if we go to vm86.
208 */
209 td2->td_frame = (struct trapframe *)((caddr_t)td2->td_pcb -
210 VM86_STACK_SPACE) - 1;
211 bcopy(td1->td_frame, td2->td_frame, sizeof(struct trapframe));
212
213 td2->td_frame->tf_eax = 0; /* Child returns zero */
214 td2->td_frame->tf_eflags &= ~PSL_C; /* success */
215 td2->td_frame->tf_edx = 1;
216
217 /*
218 * If the parent process has the trap bit set (i.e. a debugger had
219 * single stepped the process to the system call), we need to clear
220 * the trap flag from the new frame unless the debugger had set PF_FORK
221 * on the parent. Otherwise, the child will receive a (likely
222 * unexpected) SIGTRAP when it executes the first instruction after
223 * returning to userland.
224 */
225 if ((p1->p_pfsflags & PF_FORK) == 0)
226 td2->td_frame->tf_eflags &= ~PSL_T;
227
228 /*
229 * Set registers for trampoline to user mode. Leave space for the
230 * return address on stack. These are the kernel mode register values.
231 */
232 #if defined(PAE) || defined(PAE_TABLES)
233 pcb2->pcb_cr3 = vtophys(vmspace_pmap(p2->p_vmspace)->pm_pdpt);
234 #else
235 pcb2->pcb_cr3 = vtophys(vmspace_pmap(p2->p_vmspace)->pm_pdir);
236 #endif
237 pcb2->pcb_edi = 0;
238 pcb2->pcb_esi = (int)fork_return; /* fork_trampoline argument */
239 pcb2->pcb_ebp = 0;
240 pcb2->pcb_esp = (int)td2->td_frame - sizeof(void *);
241 pcb2->pcb_ebx = (int)td2; /* fork_trampoline argument */
242 pcb2->pcb_eip = (int)fork_trampoline + setidt_disp;
243 /*-
244 * pcb2->pcb_dr*: cloned above.
245 * pcb2->pcb_savefpu: cloned above.
246 * pcb2->pcb_flags: cloned above.
247 * pcb2->pcb_onfault: cloned above (always NULL here?).
248 * pcb2->pcb_gs: cloned above.
249 * pcb2->pcb_ext: cleared below.
250 */
251
252 /*
253 * XXX don't copy the i/o pages. this should probably be fixed.
254 */
255 pcb2->pcb_ext = 0;
256
257 /* Copy the LDT, if necessary. */
258 mtx_lock_spin(&dt_lock);
259 if (mdp2->md_ldt != NULL) {
260 if (flags & RFMEM) {
261 mdp2->md_ldt->ldt_refcnt++;
262 } else {
263 mdp2->md_ldt = user_ldt_alloc(mdp2,
264 mdp2->md_ldt->ldt_len);
265 if (mdp2->md_ldt == NULL)
266 panic("could not copy LDT");
267 }
268 }
269 mtx_unlock_spin(&dt_lock);
270
271 /* Setup to release spin count in fork_exit(). */
272 td2->td_md.md_spinlock_count = 1;
273 td2->td_md.md_saved_flags = PSL_KERNEL | PSL_I;
274
275 /*
276 * Now, cpu_switch() can schedule the new process.
277 * pcb_esp is loaded pointing to the cpu_switch() stack frame
278 * containing the return address when exiting cpu_switch.
279 * This will normally be to fork_trampoline(), which will have
280 * %ebx loaded with the new proc's pointer. fork_trampoline()
281 * will set up a stack to call fork_return(p, frame); to complete
282 * the return to user-mode.
283 */
284 }
285
286 /*
287 * Intercept the return address from a freshly forked process that has NOT
288 * been scheduled yet.
289 *
290 * This is needed to make kernel threads stay in kernel mode.
291 */
292 void
293 cpu_fork_kthread_handler(struct thread *td, void (*func)(void *), void *arg)
294 {
295 /*
296 * Note that the trap frame follows the args, so the function
297 * is really called like this: func(arg, frame);
298 */
299 td->td_pcb->pcb_esi = (int) func; /* function */
300 td->td_pcb->pcb_ebx = (int) arg; /* first arg */
301 }
302
303 void
304 cpu_exit(struct thread *td)
305 {
306
307 /*
308 * If this process has a custom LDT, release it. Reset pc->pcb_gs
309 * and %gs before we free it in case they refer to an LDT entry.
310 */
311 mtx_lock_spin(&dt_lock);
312 if (td->td_proc->p_md.md_ldt) {
313 td->td_pcb->pcb_gs = _udatasel;
314 load_gs(_udatasel);
315 user_ldt_free(td);
316 } else
317 mtx_unlock_spin(&dt_lock);
318 }
319
320 void
321 cpu_thread_exit(struct thread *td)
322 {
323
324 critical_enter();
325 if (td == PCPU_GET(fpcurthread))
326 npxdrop();
327 critical_exit();
328
329 /* Disable any hardware breakpoints. */
330 if (td->td_pcb->pcb_flags & PCB_DBREGS) {
331 reset_dbregs();
332 td->td_pcb->pcb_flags &= ~PCB_DBREGS;
333 }
334 }
335
336 void
337 cpu_thread_clean(struct thread *td)
338 {
339 struct pcb *pcb;
340
341 pcb = td->td_pcb;
342 if (pcb->pcb_ext != NULL) {
343 /* if (pcb->pcb_ext->ext_refcount-- == 1) ?? */
344 /*
345 * XXX do we need to move the TSS off the allocated pages
346 * before freeing them? (not done here)
347 */
348 pmap_trm_free(pcb->pcb_ext, ctob(IOPAGES + 1));
349 pcb->pcb_ext = NULL;
350 }
351 }
352
353 void
354 cpu_thread_swapin(struct thread *td)
355 {
356 }
357
358 void
359 cpu_thread_swapout(struct thread *td)
360 {
361 }
362
363 void
364 cpu_thread_alloc(struct thread *td)
365 {
366 struct pcb *pcb;
367 struct xstate_hdr *xhdr;
368
369 td->td_pcb = pcb = get_pcb_td(td);
370 td->td_frame = (struct trapframe *)((caddr_t)pcb -
371 VM86_STACK_SPACE) - 1;
372 pcb->pcb_ext = NULL;
373 pcb->pcb_save = get_pcb_user_save_pcb(pcb);
374 if (use_xsave) {
375 xhdr = (struct xstate_hdr *)(pcb->pcb_save + 1);
376 bzero(xhdr, sizeof(*xhdr));
377 xhdr->xstate_bv = xsave_mask;
378 }
379 }
380
381 void
382 cpu_thread_free(struct thread *td)
383 {
384
385 cpu_thread_clean(td);
386 }
387
388 bool
389 cpu_exec_vmspace_reuse(struct proc *p __unused, vm_map_t map __unused)
390 {
391
392 return (true);
393 }
394
395 int
396 cpu_procctl(struct thread *td __unused, int idtype __unused, id_t id __unused,
397 int com __unused, void *data __unused)
398 {
399
400 return (EINVAL);
401 }
402
403 void
404 cpu_set_syscall_retval(struct thread *td, int error)
405 {
406
407 switch (error) {
408 case 0:
409 td->td_frame->tf_eax = td->td_retval[0];
410 td->td_frame->tf_edx = td->td_retval[1];
411 td->td_frame->tf_eflags &= ~PSL_C;
412 break;
413
414 case ERESTART:
415 /*
416 * Reconstruct pc, assuming lcall $X,y is 7 bytes, int
417 * 0x80 is 2 bytes. We saved this in tf_err.
418 */
419 td->td_frame->tf_eip -= td->td_frame->tf_err;
420 break;
421
422 case EJUSTRETURN:
423 break;
424
425 default:
426 td->td_frame->tf_eax = SV_ABI_ERRNO(td->td_proc, error);
427 td->td_frame->tf_eflags |= PSL_C;
428 break;
429 }
430 }
431
432 /*
433 * Initialize machine state, mostly pcb and trap frame for a new
434 * thread, about to return to userspace. Put enough state in the new
435 * thread's PCB to get it to go back to the fork_return(), which
436 * finalizes the thread state and handles peculiarities of the first
437 * return to userspace for the new thread.
438 */
439 void
440 cpu_copy_thread(struct thread *td, struct thread *td0)
441 {
442 struct pcb *pcb2;
443
444 /* Point the pcb to the top of the stack. */
445 pcb2 = td->td_pcb;
446
447 /*
448 * Copy the upcall pcb. This loads kernel regs.
449 * Those not loaded individually below get their default
450 * values here.
451 */
452 bcopy(td0->td_pcb, pcb2, sizeof(*pcb2));
453 pcb2->pcb_flags &= ~(PCB_NPXINITDONE | PCB_NPXUSERINITDONE |
454 PCB_KERNNPX);
455 pcb2->pcb_save = get_pcb_user_save_pcb(pcb2);
456 bcopy(get_pcb_user_save_td(td0), pcb2->pcb_save,
457 cpu_max_ext_state_size);
458
459 /*
460 * Create a new fresh stack for the new thread.
461 */
462 bcopy(td0->td_frame, td->td_frame, sizeof(struct trapframe));
463
464 /* If the current thread has the trap bit set (i.e. a debugger had
465 * single stepped the process to the system call), we need to clear
466 * the trap flag from the new frame. Otherwise, the new thread will
467 * receive a (likely unexpected) SIGTRAP when it executes the first
468 * instruction after returning to userland.
469 */
470 td->td_frame->tf_eflags &= ~PSL_T;
471
472 /*
473 * Set registers for trampoline to user mode. Leave space for the
474 * return address on stack. These are the kernel mode register values.
475 */
476 pcb2->pcb_edi = 0;
477 pcb2->pcb_esi = (int)fork_return; /* trampoline arg */
478 pcb2->pcb_ebp = 0;
479 pcb2->pcb_esp = (int)td->td_frame - sizeof(void *); /* trampoline arg */
480 pcb2->pcb_ebx = (int)td; /* trampoline arg */
481 pcb2->pcb_eip = (int)fork_trampoline + setidt_disp;
482 pcb2->pcb_gs = rgs();
483 /*
484 * If we didn't copy the pcb, we'd need to do the following registers:
485 * pcb2->pcb_cr3: cloned above.
486 * pcb2->pcb_dr*: cloned above.
487 * pcb2->pcb_savefpu: cloned above.
488 * pcb2->pcb_flags: cloned above.
489 * pcb2->pcb_onfault: cloned above (always NULL here?).
490 * pcb2->pcb_gs: cloned above.
491 * pcb2->pcb_ext: cleared below.
492 */
493 pcb2->pcb_ext = NULL;
494
495 /* Setup to release spin count in fork_exit(). */
496 td->td_md.md_spinlock_count = 1;
497 td->td_md.md_saved_flags = PSL_KERNEL | PSL_I;
498 }
499
500 /*
501 * Set that machine state for performing an upcall that starts
502 * the entry function with the given argument.
503 */
504 void
505 cpu_set_upcall(struct thread *td, void (*entry)(void *), void *arg,
506 stack_t *stack)
507 {
508
509 /*
510 * Do any extra cleaning that needs to be done.
511 * The thread may have optional components
512 * that are not present in a fresh thread.
513 * This may be a recycled thread so make it look
514 * as though it's newly allocated.
515 */
516 cpu_thread_clean(td);
517
518 /*
519 * Set the trap frame to point at the beginning of the entry
520 * function.
521 */
522 td->td_frame->tf_ebp = 0;
523 td->td_frame->tf_esp =
524 (((int)stack->ss_sp + stack->ss_size - 4) & ~0x0f) - 4;
525 td->td_frame->tf_eip = (int)entry;
526
527 /* Return address sentinel value to stop stack unwinding. */
528 suword((void *)td->td_frame->tf_esp, 0);
529
530 /* Pass the argument to the entry point. */
531 suword((void *)(td->td_frame->tf_esp + sizeof(void *)),
532 (int)arg);
533 }
534
535 int
536 cpu_set_user_tls(struct thread *td, void *tls_base)
537 {
538 struct segment_descriptor sd;
539 uint32_t base;
540
541 /*
542 * Construct a descriptor and store it in the pcb for
543 * the next context switch. Also store it in the gdt
544 * so that the load of tf_fs into %fs will activate it
545 * at return to userland.
546 */
547 base = (uint32_t)tls_base;
548 sd.sd_lobase = base & 0xffffff;
549 sd.sd_hibase = (base >> 24) & 0xff;
550 sd.sd_lolimit = 0xffff; /* 4GB limit, wraps around */
551 sd.sd_hilimit = 0xf;
552 sd.sd_type = SDT_MEMRWA;
553 sd.sd_dpl = SEL_UPL;
554 sd.sd_p = 1;
555 sd.sd_xx = 0;
556 sd.sd_def32 = 1;
557 sd.sd_gran = 1;
558 critical_enter();
559 /* set %gs */
560 td->td_pcb->pcb_gsd = sd;
561 if (td == curthread) {
562 PCPU_GET(fsgs_gdt)[1] = sd;
563 load_gs(GSEL(GUGS_SEL, SEL_UPL));
564 }
565 critical_exit();
566 return (0);
567 }
568
569 /*
570 * Convert kernel VA to physical address
571 */
572 vm_paddr_t
573 kvtop(void *addr)
574 {
575 vm_paddr_t pa;
576
577 pa = pmap_kextract((vm_offset_t)addr);
578 if (pa == 0)
579 panic("kvtop: zero page frame");
580 return (pa);
581 }
582
583 /*
584 * Get an sf_buf from the freelist. May block if none are available.
585 */
586 void
587 sf_buf_map(struct sf_buf *sf, int flags)
588 {
589 pt_entry_t opte, *ptep;
590
591 /*
592 * Update the sf_buf's virtual-to-physical mapping, flushing the
593 * virtual address from the TLB. Since the reference count for
594 * the sf_buf's old mapping was zero, that mapping is not
595 * currently in use. Consequently, there is no need to exchange
596 * the old and new PTEs atomically, even under PAE.
597 */
598 ptep = vtopte(sf->kva);
599 opte = *ptep;
600 *ptep = VM_PAGE_TO_PHYS(sf->m) | PG_RW | PG_V |
601 pmap_cache_bits(kernel_pmap, sf->m->md.pat_mode, 0);
602
603 /*
604 * Avoid unnecessary TLB invalidations: If the sf_buf's old
605 * virtual-to-physical mapping was not used, then any processor
606 * that has invalidated the sf_buf's virtual address from its TLB
607 * since the last used mapping need not invalidate again.
608 */
609 #ifdef SMP
610 if ((opte & (PG_V | PG_A)) == (PG_V | PG_A))
611 CPU_ZERO(&sf->cpumask);
612
613 sf_buf_shootdown(sf, flags);
614 #else
615 if ((opte & (PG_V | PG_A)) == (PG_V | PG_A))
616 pmap_invalidate_page(kernel_pmap, sf->kva);
617 #endif
618 }
619
620 #ifdef SMP
621 static void
622 sf_buf_shootdown_curcpu_cb(pmap_t pmap __unused,
623 vm_offset_t addr1 __unused, vm_offset_t addr2 __unused)
624 {
625 }
626
627 void
628 sf_buf_shootdown(struct sf_buf *sf, int flags)
629 {
630 cpuset_t other_cpus;
631 u_int cpuid;
632
633 sched_pin();
634 cpuid = PCPU_GET(cpuid);
635 if (!CPU_ISSET(cpuid, &sf->cpumask)) {
636 CPU_SET(cpuid, &sf->cpumask);
637 invlpg(sf->kva);
638 }
639 if ((flags & SFB_CPUPRIVATE) == 0) {
640 other_cpus = all_cpus;
641 CPU_CLR(cpuid, &other_cpus);
642 CPU_NAND(&other_cpus, &sf->cpumask);
643 if (!CPU_EMPTY(&other_cpus)) {
644 CPU_OR(&sf->cpumask, &other_cpus);
645 smp_masked_invlpg(other_cpus, sf->kva, kernel_pmap,
646 sf_buf_shootdown_curcpu_cb);
647 }
648 }
649 sched_unpin();
650 }
651 #endif
652
653 /*
654 * MD part of sf_buf_free().
655 */
656 int
657 sf_buf_unmap(struct sf_buf *sf)
658 {
659
660 return (0);
661 }
662
663 static void
664 sf_buf_invalidate(struct sf_buf *sf)
665 {
666 vm_page_t m = sf->m;
667
668 /*
669 * Use pmap_qenter to update the pte for
670 * existing mapping, in particular, the PAT
671 * settings are recalculated.
672 */
673 pmap_qenter(sf->kva, &m, 1);
674 pmap_invalidate_cache_range(sf->kva, sf->kva + PAGE_SIZE);
675 }
676
677 /*
678 * Invalidate the cache lines that may belong to the page, if
679 * (possibly old) mapping of the page by sf buffer exists. Returns
680 * TRUE when mapping was found and cache invalidated.
681 */
682 boolean_t
683 sf_buf_invalidate_cache(vm_page_t m)
684 {
685
686 return (sf_buf_process_page(m, sf_buf_invalidate));
687 }
688
689 /*
690 * Software interrupt handler for queued VM system processing.
691 */
692 void
693 swi_vm(void *dummy)
694 {
695 if (busdma_swi_pending != 0)
696 busdma_swi();
697 }
698
699 /*
700 * Tell whether this address is in some physical memory region.
701 * Currently used by the kernel coredump code in order to avoid
702 * dumping the ``ISA memory hole'' which could cause indefinite hangs,
703 * or other unpredictable behaviour.
704 */
705
706 int
707 is_physical_memory(vm_paddr_t addr)
708 {
709
710 #ifdef DEV_ISA
711 /* The ISA ``memory hole''. */
712 if (addr >= 0xa0000 && addr < 0x100000)
713 return 0;
714 #endif
715
716 /*
717 * stuff other tests for known memory-mapped devices (PCI?)
718 * here
719 */
720
721 return 1;
722 }
Cache object: f4407431bb9bdd912e7766e1ac177ee1
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