1 /*-
2 * Copyright (c) 1982, 1986 The Regents of the University of California.
3 * Copyright (c) 1989, 1990 William Jolitz
4 * Copyright (c) 1994 John Dyson
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * the Systems Programming Group of the University of Utah Computer
9 * Science Department, and William Jolitz.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
40 * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
41 */
42
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD: releng/9.0/sys/amd64/amd64/vm_machdep.c 223758 2011-07-04 12:04:52Z attilio $");
45
46 #include "opt_isa.h"
47 #include "opt_cpu.h"
48 #include "opt_compat.h"
49
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/bio.h>
53 #include <sys/buf.h>
54 #include <sys/kernel.h>
55 #include <sys/ktr.h>
56 #include <sys/lock.h>
57 #include <sys/malloc.h>
58 #include <sys/mbuf.h>
59 #include <sys/mutex.h>
60 #include <sys/pioctl.h>
61 #include <sys/proc.h>
62 #include <sys/sf_buf.h>
63 #include <sys/smp.h>
64 #include <sys/sysctl.h>
65 #include <sys/sysent.h>
66 #include <sys/unistd.h>
67 #include <sys/vnode.h>
68 #include <sys/vmmeter.h>
69
70 #include <machine/cpu.h>
71 #include <machine/md_var.h>
72 #include <machine/pcb.h>
73 #include <machine/smp.h>
74 #include <machine/specialreg.h>
75 #include <machine/tss.h>
76
77 #include <vm/vm.h>
78 #include <vm/vm_extern.h>
79 #include <vm/vm_kern.h>
80 #include <vm/vm_page.h>
81 #include <vm/vm_map.h>
82 #include <vm/vm_param.h>
83
84 #include <x86/isa/isa.h>
85
86 static void cpu_reset_real(void);
87 #ifdef SMP
88 static void cpu_reset_proxy(void);
89 static u_int cpu_reset_proxyid;
90 static volatile u_int cpu_reset_proxy_active;
91 #endif
92
93 /*
94 * Finish a fork operation, with process p2 nearly set up.
95 * Copy and update the pcb, set up the stack so that the child
96 * ready to run and return to user mode.
97 */
98 void
99 cpu_fork(td1, p2, td2, flags)
100 register struct thread *td1;
101 register struct proc *p2;
102 struct thread *td2;
103 int flags;
104 {
105 register struct proc *p1;
106 struct pcb *pcb2;
107 struct mdproc *mdp1, *mdp2;
108 struct proc_ldt *pldt;
109 pmap_t pmap2;
110
111 p1 = td1->td_proc;
112 if ((flags & RFPROC) == 0) {
113 if ((flags & RFMEM) == 0) {
114 /* unshare user LDT */
115 mdp1 = &p1->p_md;
116 mtx_lock(&dt_lock);
117 if ((pldt = mdp1->md_ldt) != NULL &&
118 pldt->ldt_refcnt > 1 &&
119 user_ldt_alloc(p1, 1) == NULL)
120 panic("could not copy LDT");
121 mtx_unlock(&dt_lock);
122 }
123 return;
124 }
125
126 /* Ensure that td1's pcb is up to date. */
127 fpuexit(td1);
128
129 /* Point the pcb to the top of the stack */
130 pcb2 = (struct pcb *)(td2->td_kstack +
131 td2->td_kstack_pages * PAGE_SIZE) - 1;
132 td2->td_pcb = pcb2;
133
134 /* Copy td1's pcb */
135 bcopy(td1->td_pcb, pcb2, sizeof(*pcb2));
136
137 /* Properly initialize pcb_save */
138 pcb2->pcb_save = &pcb2->pcb_user_save;
139
140 /* Point mdproc and then copy over td1's contents */
141 mdp2 = &p2->p_md;
142 bcopy(&p1->p_md, mdp2, sizeof(*mdp2));
143
144 /*
145 * Create a new fresh stack for the new process.
146 * Copy the trap frame for the return to user mode as if from a
147 * syscall. This copies most of the user mode register values.
148 */
149 td2->td_frame = (struct trapframe *)td2->td_pcb - 1;
150 bcopy(td1->td_frame, td2->td_frame, sizeof(struct trapframe));
151
152 td2->td_frame->tf_rax = 0; /* Child returns zero */
153 td2->td_frame->tf_rflags &= ~PSL_C; /* success */
154 td2->td_frame->tf_rdx = 1;
155
156 /*
157 * If the parent process has the trap bit set (i.e. a debugger had
158 * single stepped the process to the system call), we need to clear
159 * the trap flag from the new frame unless the debugger had set PF_FORK
160 * on the parent. Otherwise, the child will receive a (likely
161 * unexpected) SIGTRAP when it executes the first instruction after
162 * returning to userland.
163 */
164 if ((p1->p_pfsflags & PF_FORK) == 0)
165 td2->td_frame->tf_rflags &= ~PSL_T;
166
167 /*
168 * Set registers for trampoline to user mode. Leave space for the
169 * return address on stack. These are the kernel mode register values.
170 */
171 pmap2 = vmspace_pmap(p2->p_vmspace);
172 pcb2->pcb_cr3 = DMAP_TO_PHYS((vm_offset_t)pmap2->pm_pml4);
173 pcb2->pcb_r12 = (register_t)fork_return; /* fork_trampoline argument */
174 pcb2->pcb_rbp = 0;
175 pcb2->pcb_rsp = (register_t)td2->td_frame - sizeof(void *);
176 pcb2->pcb_rbx = (register_t)td2; /* fork_trampoline argument */
177 pcb2->pcb_rip = (register_t)fork_trampoline;
178 /*-
179 * pcb2->pcb_dr*: cloned above.
180 * pcb2->pcb_savefpu: cloned above.
181 * pcb2->pcb_flags: cloned above.
182 * pcb2->pcb_onfault: cloned above (always NULL here?).
183 * pcb2->pcb_[fg]sbase: cloned above
184 */
185
186 /* Setup to release spin count in fork_exit(). */
187 td2->td_md.md_spinlock_count = 1;
188 td2->td_md.md_saved_flags = PSL_KERNEL | PSL_I;
189
190 /* As an i386, do not copy io permission bitmap. */
191 pcb2->pcb_tssp = NULL;
192
193 /* New segment registers. */
194 set_pcb_flags(pcb2, PCB_FULL_IRET);
195
196 /* Copy the LDT, if necessary. */
197 mdp1 = &td1->td_proc->p_md;
198 mdp2 = &p2->p_md;
199 mtx_lock(&dt_lock);
200 if (mdp1->md_ldt != NULL) {
201 if (flags & RFMEM) {
202 mdp1->md_ldt->ldt_refcnt++;
203 mdp2->md_ldt = mdp1->md_ldt;
204 bcopy(&mdp1->md_ldt_sd, &mdp2->md_ldt_sd, sizeof(struct
205 system_segment_descriptor));
206 } else {
207 mdp2->md_ldt = NULL;
208 mdp2->md_ldt = user_ldt_alloc(p2, 0);
209 if (mdp2->md_ldt == NULL)
210 panic("could not copy LDT");
211 amd64_set_ldt_data(td2, 0, max_ldt_segment,
212 (struct user_segment_descriptor *)
213 mdp1->md_ldt->ldt_base);
214 }
215 } else
216 mdp2->md_ldt = NULL;
217 mtx_unlock(&dt_lock);
218
219 /*
220 * Now, cpu_switch() can schedule the new process.
221 * pcb_rsp is loaded pointing to the cpu_switch() stack frame
222 * containing the return address when exiting cpu_switch.
223 * This will normally be to fork_trampoline(), which will have
224 * %ebx loaded with the new proc's pointer. fork_trampoline()
225 * will set up a stack to call fork_return(p, frame); to complete
226 * the return to user-mode.
227 */
228 }
229
230 /*
231 * Intercept the return address from a freshly forked process that has NOT
232 * been scheduled yet.
233 *
234 * This is needed to make kernel threads stay in kernel mode.
235 */
236 void
237 cpu_set_fork_handler(td, func, arg)
238 struct thread *td;
239 void (*func)(void *);
240 void *arg;
241 {
242 /*
243 * Note that the trap frame follows the args, so the function
244 * is really called like this: func(arg, frame);
245 */
246 td->td_pcb->pcb_r12 = (long) func; /* function */
247 td->td_pcb->pcb_rbx = (long) arg; /* first arg */
248 }
249
250 void
251 cpu_exit(struct thread *td)
252 {
253
254 /*
255 * If this process has a custom LDT, release it.
256 */
257 mtx_lock(&dt_lock);
258 if (td->td_proc->p_md.md_ldt != 0)
259 user_ldt_free(td);
260 else
261 mtx_unlock(&dt_lock);
262 }
263
264 void
265 cpu_thread_exit(struct thread *td)
266 {
267 struct pcb *pcb;
268
269 critical_enter();
270 if (td == PCPU_GET(fpcurthread))
271 fpudrop();
272 critical_exit();
273
274 pcb = td->td_pcb;
275
276 /* Disable any hardware breakpoints. */
277 if (pcb->pcb_flags & PCB_DBREGS) {
278 reset_dbregs();
279 clear_pcb_flags(pcb, PCB_DBREGS);
280 }
281 }
282
283 void
284 cpu_thread_clean(struct thread *td)
285 {
286 struct pcb *pcb;
287
288 pcb = td->td_pcb;
289
290 /*
291 * Clean TSS/iomap
292 */
293 if (pcb->pcb_tssp != NULL) {
294 kmem_free(kernel_map, (vm_offset_t)pcb->pcb_tssp,
295 ctob(IOPAGES + 1));
296 pcb->pcb_tssp = NULL;
297 }
298 }
299
300 void
301 cpu_thread_swapin(struct thread *td)
302 {
303 }
304
305 void
306 cpu_thread_swapout(struct thread *td)
307 {
308 }
309
310 void
311 cpu_thread_alloc(struct thread *td)
312 {
313
314 td->td_pcb = (struct pcb *)(td->td_kstack +
315 td->td_kstack_pages * PAGE_SIZE) - 1;
316 td->td_frame = (struct trapframe *)td->td_pcb - 1;
317 td->td_pcb->pcb_save = &td->td_pcb->pcb_user_save;
318 }
319
320 void
321 cpu_thread_free(struct thread *td)
322 {
323
324 cpu_thread_clean(td);
325 }
326
327 void
328 cpu_set_syscall_retval(struct thread *td, int error)
329 {
330
331 switch (error) {
332 case 0:
333 td->td_frame->tf_rax = td->td_retval[0];
334 td->td_frame->tf_rdx = td->td_retval[1];
335 td->td_frame->tf_rflags &= ~PSL_C;
336 break;
337
338 case ERESTART:
339 /*
340 * Reconstruct pc, we know that 'syscall' is 2 bytes,
341 * lcall $X,y is 7 bytes, int 0x80 is 2 bytes.
342 * We saved this in tf_err.
343 * %r10 (which was holding the value of %rcx) is restored
344 * for the next iteration.
345 * %r10 restore is only required for freebsd/amd64 processes,
346 * but shall be innocent for any ia32 ABI.
347 */
348 td->td_frame->tf_rip -= td->td_frame->tf_err;
349 td->td_frame->tf_r10 = td->td_frame->tf_rcx;
350 break;
351
352 case EJUSTRETURN:
353 break;
354
355 default:
356 if (td->td_proc->p_sysent->sv_errsize) {
357 if (error >= td->td_proc->p_sysent->sv_errsize)
358 error = -1; /* XXX */
359 else
360 error = td->td_proc->p_sysent->sv_errtbl[error];
361 }
362 td->td_frame->tf_rax = error;
363 td->td_frame->tf_rflags |= PSL_C;
364 break;
365 }
366 }
367
368 /*
369 * Initialize machine state (pcb and trap frame) for a new thread about to
370 * upcall. Put enough state in the new thread's PCB to get it to go back
371 * userret(), where we can intercept it again to set the return (upcall)
372 * Address and stack, along with those from upcals that are from other sources
373 * such as those generated in thread_userret() itself.
374 */
375 void
376 cpu_set_upcall(struct thread *td, struct thread *td0)
377 {
378 struct pcb *pcb2;
379
380 /* Point the pcb to the top of the stack. */
381 pcb2 = td->td_pcb;
382
383 /*
384 * Copy the upcall pcb. This loads kernel regs.
385 * Those not loaded individually below get their default
386 * values here.
387 */
388 bcopy(td0->td_pcb, pcb2, sizeof(*pcb2));
389 clear_pcb_flags(pcb2, PCB_FPUINITDONE | PCB_USERFPUINITDONE);
390 pcb2->pcb_save = &pcb2->pcb_user_save;
391 set_pcb_flags(pcb2, PCB_FULL_IRET);
392
393 /*
394 * Create a new fresh stack for the new thread.
395 */
396 bcopy(td0->td_frame, td->td_frame, sizeof(struct trapframe));
397
398 /* If the current thread has the trap bit set (i.e. a debugger had
399 * single stepped the process to the system call), we need to clear
400 * the trap flag from the new frame. Otherwise, the new thread will
401 * receive a (likely unexpected) SIGTRAP when it executes the first
402 * instruction after returning to userland.
403 */
404 td->td_frame->tf_rflags &= ~PSL_T;
405
406 /*
407 * Set registers for trampoline to user mode. Leave space for the
408 * return address on stack. These are the kernel mode register values.
409 */
410 pcb2->pcb_r12 = (register_t)fork_return; /* trampoline arg */
411 pcb2->pcb_rbp = 0;
412 pcb2->pcb_rsp = (register_t)td->td_frame - sizeof(void *); /* trampoline arg */
413 pcb2->pcb_rbx = (register_t)td; /* trampoline arg */
414 pcb2->pcb_rip = (register_t)fork_trampoline;
415 /*
416 * If we didn't copy the pcb, we'd need to do the following registers:
417 * pcb2->pcb_cr3: cloned above.
418 * pcb2->pcb_dr*: cloned above.
419 * pcb2->pcb_savefpu: cloned above.
420 * pcb2->pcb_onfault: cloned above (always NULL here?).
421 * pcb2->pcb_[fg]sbase: cloned above
422 */
423
424 /* Setup to release spin count in fork_exit(). */
425 td->td_md.md_spinlock_count = 1;
426 td->td_md.md_saved_flags = PSL_KERNEL | PSL_I;
427 }
428
429 /*
430 * Set that machine state for performing an upcall that has to
431 * be done in thread_userret() so that those upcalls generated
432 * in thread_userret() itself can be done as well.
433 */
434 void
435 cpu_set_upcall_kse(struct thread *td, void (*entry)(void *), void *arg,
436 stack_t *stack)
437 {
438
439 /*
440 * Do any extra cleaning that needs to be done.
441 * The thread may have optional components
442 * that are not present in a fresh thread.
443 * This may be a recycled thread so make it look
444 * as though it's newly allocated.
445 */
446 cpu_thread_clean(td);
447
448 #ifdef COMPAT_FREEBSD32
449 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
450 /*
451 * Set the trap frame to point at the beginning of the uts
452 * function.
453 */
454 td->td_frame->tf_rbp = 0;
455 td->td_frame->tf_rsp =
456 (((uintptr_t)stack->ss_sp + stack->ss_size - 4) & ~0x0f) - 4;
457 td->td_frame->tf_rip = (uintptr_t)entry;
458
459 /*
460 * Pass the address of the mailbox for this kse to the uts
461 * function as a parameter on the stack.
462 */
463 suword32((void *)(td->td_frame->tf_rsp + sizeof(int32_t)),
464 (uint32_t)(uintptr_t)arg);
465
466 return;
467 }
468 #endif
469
470 /*
471 * Set the trap frame to point at the beginning of the uts
472 * function.
473 */
474 td->td_frame->tf_rbp = 0;
475 td->td_frame->tf_rsp =
476 ((register_t)stack->ss_sp + stack->ss_size) & ~0x0f;
477 td->td_frame->tf_rsp -= 8;
478 td->td_frame->tf_rip = (register_t)entry;
479 td->td_frame->tf_ds = _udatasel;
480 td->td_frame->tf_es = _udatasel;
481 td->td_frame->tf_fs = _ufssel;
482 td->td_frame->tf_gs = _ugssel;
483 td->td_frame->tf_flags = TF_HASSEGS;
484
485 /*
486 * Pass the address of the mailbox for this kse to the uts
487 * function as a parameter on the stack.
488 */
489 td->td_frame->tf_rdi = (register_t)arg;
490 }
491
492 int
493 cpu_set_user_tls(struct thread *td, void *tls_base)
494 {
495 struct pcb *pcb;
496
497 if ((u_int64_t)tls_base >= VM_MAXUSER_ADDRESS)
498 return (EINVAL);
499
500 pcb = td->td_pcb;
501 #ifdef COMPAT_FREEBSD32
502 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
503 pcb->pcb_gsbase = (register_t)tls_base;
504 return (0);
505 }
506 #endif
507 pcb->pcb_fsbase = (register_t)tls_base;
508 set_pcb_flags(pcb, PCB_FULL_IRET);
509 return (0);
510 }
511
512 #ifdef SMP
513 static void
514 cpu_reset_proxy()
515 {
516 cpuset_t tcrp;
517
518 cpu_reset_proxy_active = 1;
519 while (cpu_reset_proxy_active == 1)
520 ; /* Wait for other cpu to see that we've started */
521 CPU_SETOF(cpu_reset_proxyid, &tcrp);
522 stop_cpus(tcrp);
523 printf("cpu_reset_proxy: Stopped CPU %d\n", cpu_reset_proxyid);
524 DELAY(1000000);
525 cpu_reset_real();
526 }
527 #endif
528
529 void
530 cpu_reset()
531 {
532 #ifdef SMP
533 cpuset_t map;
534 u_int cnt;
535
536 if (smp_active) {
537 map = all_cpus;
538 CPU_CLR(PCPU_GET(cpuid), &map);
539 CPU_NAND(&map, &stopped_cpus);
540 if (!CPU_EMPTY(&map)) {
541 printf("cpu_reset: Stopping other CPUs\n");
542 stop_cpus(map);
543 }
544
545 if (PCPU_GET(cpuid) != 0) {
546 cpu_reset_proxyid = PCPU_GET(cpuid);
547 cpustop_restartfunc = cpu_reset_proxy;
548 cpu_reset_proxy_active = 0;
549 printf("cpu_reset: Restarting BSP\n");
550
551 /* Restart CPU #0. */
552 CPU_SETOF(0, &started_cpus);
553 wmb();
554
555 cnt = 0;
556 while (cpu_reset_proxy_active == 0 && cnt < 10000000)
557 cnt++; /* Wait for BSP to announce restart */
558 if (cpu_reset_proxy_active == 0)
559 printf("cpu_reset: Failed to restart BSP\n");
560 enable_intr();
561 cpu_reset_proxy_active = 2;
562
563 while (1);
564 /* NOTREACHED */
565 }
566
567 DELAY(1000000);
568 }
569 #endif
570 cpu_reset_real();
571 /* NOTREACHED */
572 }
573
574 static void
575 cpu_reset_real()
576 {
577 struct region_descriptor null_idt;
578 int b;
579
580 disable_intr();
581
582 /*
583 * Attempt to do a CPU reset via the keyboard controller,
584 * do not turn off GateA20, as any machine that fails
585 * to do the reset here would then end up in no man's land.
586 */
587 outb(IO_KBD + 4, 0xFE);
588 DELAY(500000); /* wait 0.5 sec to see if that did it */
589
590 /*
591 * Attempt to force a reset via the Reset Control register at
592 * I/O port 0xcf9. Bit 2 forces a system reset when it
593 * transitions from 0 to 1. Bit 1 selects the type of reset
594 * to attempt: 0 selects a "soft" reset, and 1 selects a
595 * "hard" reset. We try a "hard" reset. The first write sets
596 * bit 1 to select a "hard" reset and clears bit 2. The
597 * second write forces a 0 -> 1 transition in bit 2 to trigger
598 * a reset.
599 */
600 outb(0xcf9, 0x2);
601 outb(0xcf9, 0x6);
602 DELAY(500000); /* wait 0.5 sec to see if that did it */
603
604 /*
605 * Attempt to force a reset via the Fast A20 and Init register
606 * at I/O port 0x92. Bit 1 serves as an alternate A20 gate.
607 * Bit 0 asserts INIT# when set to 1. We are careful to only
608 * preserve bit 1 while setting bit 0. We also must clear bit
609 * 0 before setting it if it isn't already clear.
610 */
611 b = inb(0x92);
612 if (b != 0xff) {
613 if ((b & 0x1) != 0)
614 outb(0x92, b & 0xfe);
615 outb(0x92, b | 0x1);
616 DELAY(500000); /* wait 0.5 sec to see if that did it */
617 }
618
619 printf("No known reset method worked, attempting CPU shutdown\n");
620 DELAY(1000000); /* wait 1 sec for printf to complete */
621
622 /* Wipe the IDT. */
623 null_idt.rd_limit = 0;
624 null_idt.rd_base = 0;
625 lidt(&null_idt);
626
627 /* "good night, sweet prince .... <THUNK!>" */
628 breakpoint();
629
630 /* NOTREACHED */
631 while(1);
632 }
633
634 /*
635 * Allocate an sf_buf for the given vm_page. On this machine, however, there
636 * is no sf_buf object. Instead, an opaque pointer to the given vm_page is
637 * returned.
638 */
639 struct sf_buf *
640 sf_buf_alloc(struct vm_page *m, int pri)
641 {
642
643 return ((struct sf_buf *)m);
644 }
645
646 /*
647 * Free the sf_buf. In fact, do nothing because there are no resources
648 * associated with the sf_buf.
649 */
650 void
651 sf_buf_free(struct sf_buf *sf)
652 {
653 }
654
655 /*
656 * Software interrupt handler for queued VM system processing.
657 */
658 void
659 swi_vm(void *dummy)
660 {
661 if (busdma_swi_pending != 0)
662 busdma_swi();
663 }
664
665 /*
666 * Tell whether this address is in some physical memory region.
667 * Currently used by the kernel coredump code in order to avoid
668 * dumping the ``ISA memory hole'' which could cause indefinite hangs,
669 * or other unpredictable behaviour.
670 */
671
672 int
673 is_physical_memory(vm_paddr_t addr)
674 {
675
676 #ifdef DEV_ISA
677 /* The ISA ``memory hole''. */
678 if (addr >= 0xa0000 && addr < 0x100000)
679 return 0;
680 #endif
681
682 /*
683 * stuff other tests for known memory-mapped devices (PCI?)
684 * here
685 */
686
687 return 1;
688 }
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