xref: /netbsd-src/sys/rump/librump/rumpkern/rump.c (revision 154bfe8e089c1a0a4e9ed8414f08d3da90949162) 
1 /*	$NetBSD: rump.c,v 1.349 2020/06/11 00:33:30 kamil Exp $	*/
2 
3 /*
4  * Copyright (c) 2007-2011 Antti Kantee.  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  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  */
27 
28 #include <sys/cdefs.h>
29 __KERNEL_RCSID(0, "$NetBSD: rump.c,v 1.349 2020/06/11 00:33:30 kamil Exp $");
30 
31 #include <sys/systm.h>
32 #define ELFSIZE ARCH_ELFSIZE
33 
34 #include <sys/param.h>
35 #include <sys/atomic.h>
36 #include <sys/buf.h>
37 #include <sys/callout.h>
38 #include <sys/conf.h>
39 #include <sys/cpu.h>
40 #include <sys/device.h>
41 #include <sys/evcnt.h>
42 #include <sys/event.h>
43 #include <sys/exec_elf.h>
44 #include <sys/filedesc.h>
45 #include <sys/iostat.h>
46 #include <sys/kauth.h>
47 #include <sys/kcpuset.h>
48 #include <sys/kernel.h>
49 #include <sys/kmem.h>
50 #include <sys/kprintf.h>
51 #include <sys/kthread.h>
52 #include <sys/ksyms.h>
53 #include <sys/msgbuf.h>
54 #include <sys/module.h>
55 #include <sys/module_hook.h>
56 #include <sys/namei.h>
57 #include <sys/once.h>
58 #include <sys/percpu.h>
59 #include <sys/pipe.h>
60 #include <sys/pool.h>
61 #include <sys/queue.h>
62 #include <sys/reboot.h>
63 #include <sys/resourcevar.h>
64 #include <sys/select.h>
65 #include <sys/sysctl.h>
66 #include <sys/syscall.h>
67 #include <sys/syscallvar.h>
68 #include <sys/threadpool.h>
69 #include <sys/timetc.h>
70 #include <sys/tty.h>
71 #include <sys/uidinfo.h>
72 #include <sys/vmem.h>
73 #include <sys/xcall.h>
74 #include <sys/cprng.h>
75 #include <sys/rnd.h>
76 #include <sys/ktrace.h>
77 #include <sys/pserialize.h>
78 #include <sys/psref.h>
79 
80 #include <rump-sys/kern.h>
81 #include <rump-sys/dev.h>
82 #include <rump-sys/net.h>
83 #include <rump-sys/vfs.h>
84 
85 #include <rump/rumpuser.h>
86 
87 #include <secmodel/suser/suser.h>
88 
89 #include <prop/proplib.h>
90 
91 #include <uvm/uvm_extern.h>
92 #include <uvm/uvm_readahead.h>
93 
94 char machine[] = MACHINE;
95 char machine_arch[] = MACHINE_ARCH;
96 
97 struct proc *initproc;
98 
99 struct device rump_rootdev = {
100 	.dv_class = DV_VIRTUAL
101 };
102 
103 #ifdef RUMP_WITHOUT_THREADS
104 int rump_threads = 0;
105 #else
106 int rump_threads = 1;
107 #endif
108 
109 static void rump_component_addlocal(void);
110 static struct lwp *bootlwp;
111 
112 /* 16k should be enough for std rump needs */
113 static  char rump_msgbuf[16*1024] __aligned(256);
114 
115 bool rump_ttycomponent = false;
116 
117 extern pool_cache_t pnbuf_cache;
118 
119 static int rump_inited;
120 
121 void (*rump_vfs_drainbufs)(int) = (void *)nullop;
122 int  (*rump_vfs_makeonedevnode)(dev_t, const char *,
123 				devmajor_t, devminor_t) = (void *)nullop;
124 int  (*rump_vfs_makedevnodes)(dev_t, const char *, char,
125 			      devmajor_t, devminor_t, int) = (void *)nullop;
126 int  (*rump_vfs_makesymlink)(const char *, const char *) = (void *)nullop;
127 
128 rump_proc_vfs_init_fn rump_proc_vfs_init = (void *)nullop;
129 rump_proc_vfs_release_fn rump_proc_vfs_release = (void *)nullop;
130 
131 static void add_linkedin_modules(const struct modinfo *const *, size_t);
132 static void add_static_evcnt(struct evcnt *);
133 
134 static pid_t rspo_wrap_getpid(void) {
135 	return rump_sysproxy_hyp_getpid();
136 }
137 static int rspo_wrap_syscall(int num, void *arg, long *retval) {
138 	return rump_sysproxy_hyp_syscall(num, arg, retval);
139 }
140 static int rspo_wrap_rfork(void *priv, int flag, const char *comm) {
141 	return rump_sysproxy_hyp_rfork(priv, flag, comm);
142 }
143 static void rspo_wrap_lwpexit(void) {
144 	rump_sysproxy_hyp_lwpexit();
145 }
146 static void rspo_wrap_execnotify(const char *comm) {
147 	rump_sysproxy_hyp_execnotify(comm);
148 }
149 static const struct rumpuser_hyperup hyp = {
150 	.hyp_schedule		= rump_schedule,
151 	.hyp_unschedule		= rump_unschedule,
152 	.hyp_backend_unschedule	= rump_user_unschedule,
153 	.hyp_backend_schedule	= rump_user_schedule,
154 	.hyp_lwproc_switch	= rump_lwproc_switch,
155 	.hyp_lwproc_release	= rump_lwproc_releaselwp,
156 	.hyp_lwproc_newlwp	= rump_lwproc_newlwp,
157 	.hyp_lwproc_curlwp	= rump_lwproc_curlwp,
158 
159 	.hyp_getpid		= rspo_wrap_getpid,
160 	.hyp_syscall		= rspo_wrap_syscall,
161 	.hyp_lwproc_rfork	= rspo_wrap_rfork,
162 	.hyp_lwpexit		= rspo_wrap_lwpexit,
163 	.hyp_execnotify		= rspo_wrap_execnotify,
164 };
165 struct rump_sysproxy_ops rump_sysproxy_ops = {
166 	.rspo_copyin		= (void *)enxio,
167 	.rspo_copyinstr 	= (void *)enxio,
168 	.rspo_copyout	 	= (void *)enxio,
169 	.rspo_copyoutstr 	= (void *)enxio,
170 	.rspo_anonmmap 		= (void *)enxio,
171 	.rspo_raise 		= (void *)enxio,
172 	.rspo_fini 		= (void *)enxio,
173 	.rspo_hyp_getpid 	= (void *)enxio,
174 	.rspo_hyp_syscall 	= (void *)enxio,
175 	.rspo_hyp_rfork 	= (void *)enxio,
176 	.rspo_hyp_lwpexit 	= (void *)enxio,
177 	.rspo_hyp_execnotify 	= (void *)enxio,
178 };
179 
180 int
181 rump_daemonize_begin(void)
182 {
183 
184 	if (rump_inited)
185 		return EALREADY;
186 
187 	return rumpuser_daemonize_begin();
188 }
189 
190 int
191 rump_daemonize_done(int error)
192 {
193 
194 	return rumpuser_daemonize_done(error);
195 }
196 
197 #ifdef RUMP_USE_CTOR
198 
199 /* sysctl bootstrap handling */
200 struct sysctl_boot_chain sysctl_boot_chain \
201     = LIST_HEAD_INITIALIZER(sysctl_boot_chain);
202 __link_set_add_text(sysctl_funcs,voidop); /* ensure linkset is non-empty */
203 
204 #else /* RUMP_USE_CTOR */
205 
206 RUMP_COMPONENT(RUMP_COMPONENT_POSTINIT)
207 {
208 	__link_set_decl(rump_components, struct rump_component);
209 
210 	/*
211 	 * Trick compiler into generating references so that statically
212 	 * linked rump kernels are generated with the link set symbols.
213 	 */
214 	asm("" :: "r"(__start_link_set_rump_components));
215 	asm("" :: "r"(__stop_link_set_rump_components));
216 }
217 
218 #endif /* RUMP_USE_CTOR */
219 
220 int
221 rump_init(void)
222 {
223 	char buf[256];
224 	struct timespec bts;
225 	int64_t sec;
226 	long nsec;
227 	struct lwp *l, *initlwp;
228 	int i, numcpu;
229 
230 	/* not reentrant */
231 	if (rump_inited)
232 		return 0;
233 	else if (rump_inited == -1)
234 		panic("rump_init: host process restart required");
235 	else
236 		rump_inited = 1;
237 
238 	/* initialize hypervisor */
239 	if (rumpuser_init(RUMPUSER_VERSION, &hyp) != 0) {
240 		rumpuser_dprintf("rumpuser init failed\n");
241 		return EINVAL;
242 	}
243 
244 	/* init minimal lwp/cpu context */
245 	rump_lwproc_init();
246 	l = &lwp0;
247 	l->l_cpu = l->l_target_cpu = &rump_bootcpu;
248 	rump_lwproc_curlwp_set(l);
249 
250 	/* retrieve env vars which affect the early stage of bootstrap */
251 	if (rumpuser_getparam("RUMP_THREADS", buf, sizeof(buf)) == 0) {
252 		rump_threads = *buf != '0';
253 	}
254 	if (rumpuser_getparam("RUMP_VERBOSE", buf, sizeof(buf)) == 0) {
255 		if (*buf != '0')
256 			boothowto = AB_VERBOSE;
257 	}
258 
259 	if (rumpuser_getparam(RUMPUSER_PARAM_NCPU, buf, sizeof(buf)) != 0)
260 		panic("mandatory hypervisor configuration (NCPU) missing");
261 	numcpu = strtoll(buf, NULL, 10);
262 	if (numcpu < 1) {
263 		panic("rump kernels are not lightweight enough for \"%d\" CPUs",
264 		    numcpu);
265 	}
266 
267 	rump_thread_init();
268 	rump_cpus_bootstrap(&numcpu);
269 
270 	rumpuser_clock_gettime(RUMPUSER_CLOCK_RELWALL, &sec, &nsec);
271 	bts.tv_sec = sec;
272 	bts.tv_nsec = nsec;
273 
274 	initmsgbuf(rump_msgbuf, sizeof(rump_msgbuf));
275 	aprint_verbose("%s%s", copyright, version);
276 
277 	rump_intr_init(numcpu);
278 
279 	rump_tsleep_init();
280 
281 	rumpuser_mutex_init(&rump_giantlock, RUMPUSER_MTX_SPIN);
282 	ksyms_init();
283 	uvm_init();
284 	evcnt_init();
285 
286 	kcpuset_sysinit();
287 	once_init();
288 	kernconfig_lock_init();
289 	prop_kern_init();
290 
291 	kmem_init();
292 
293 	uvm_ra_init();
294 	uao_init();
295 
296 	mutex_obj_init();
297 	rw_obj_init();
298 	callout_startup();
299 
300 	kprintf_init();
301 	percpu_init();
302 	pserialize_init();
303 
304 	kauth_init();
305 
306 	secmodel_init();
307 	sysctl_init();
308 	/*
309 	 * The above call to sysctl_init() only initializes sysctl nodes
310 	 * from link sets.  Initialize sysctls in case we used ctors.
311 	 */
312 #ifdef RUMP_USE_CTOR
313 	{
314 		struct sysctl_setup_chain *ssc;
315 
316 		while ((ssc = LIST_FIRST(&sysctl_boot_chain)) != NULL) {
317 			LIST_REMOVE(ssc, ssc_entries);
318 			ssc->ssc_func(NULL);
319 		}
320 	}
321 #endif /* RUMP_USE_CTOR */
322 
323 	rnd_init();
324 	rump_hyperentropy_init();
325 
326 	procinit();
327 	proc0_init();
328 	uid_init();
329 	chgproccnt(0, 1);
330 
331 	l->l_proc = &proc0;
332 	lwp_update_creds(l);
333 
334 	lwpinit_specificdata();
335 	lwp_initspecific(&lwp0);
336 
337 	/* Must be called after lwpinit_specificdata */
338 	psref_init();
339 
340 	threadpools_init();
341 
342 	loginit();
343 
344 	rump_biglock_init();
345 
346 	rump_scheduler_init(numcpu);
347 	/* revert temporary context and schedule a semireal context */
348 	rump_lwproc_curlwp_clear(l);
349 	initproc = &proc0; /* borrow proc0 before we get initproc started */
350 	rump_schedule();
351 	bootlwp = curlwp;
352 
353 	inittimecounter();
354 	ntp_init();
355 
356 #ifdef KTRACE
357 	ktrinit();
358 #endif
359 
360 	tc_setclock(&bts);
361 
362 	extern krwlock_t exec_lock;
363 	rw_init(&exec_lock);
364 
365 	/* we are mostly go.  do per-cpu subsystem init */
366 	for (i = 0; i < numcpu; i++) {
367 		struct cpu_info *ci = cpu_lookup(i);
368 
369 		/* attach non-bootstrap CPUs */
370 		if (i > 0) {
371 			rump_cpu_attach(ci);
372 			ncpu++;
373 		}
374 		snprintf(ci->ci_cpuname, sizeof ci->ci_cpuname, "cpu%d", i);
375 
376 		callout_init_cpu(ci);
377 		softint_init(ci);
378 		xc_init_cpu(ci);
379 		pool_cache_cpu_init(ci);
380 		selsysinit(ci);
381 		percpu_init_cpu(ci);
382 
383 		TAILQ_INIT(&ci->ci_data.cpu_ld_locks);
384 		__cpu_simple_lock_init(&ci->ci_data.cpu_ld_lock);
385 
386 		aprint_verbose("cpu%d at thinair0: rump virtual cpu\n", i);
387 	}
388 	ncpuonline = ncpu;
389 
390 	/* Once all CPUs are detected, initialize the per-CPU cprng_fast.  */
391 	cprng_init();
392 	cprng_fast_init();
393 
394 	mp_online = true;
395 
396 	/* CPUs are up.  allow kernel threads to run */
397 	rump_thread_allow(NULL);
398 
399 	rnd_init_softint();
400 
401 	kqueue_init();
402 	iostat_init();
403 	fd_sys_init();
404 	module_init();
405 	module_hook_init();
406 	devsw_init();
407 	pipe_init();
408 	resource_init();
409 	procinit_sysctl();
410 	time_init();
411 	time_init2();
412 	config_init();
413 
414 	/* start page baroness */
415 	if (rump_threads) {
416 		if (kthread_create(PRI_PGDAEMON, KTHREAD_MPSAFE, NULL,
417 		    uvm_pageout, NULL, &uvm.pagedaemon_lwp, "pdaemon") != 0)
418 			panic("pagedaemon create failed");
419 	} else
420 		uvm.pagedaemon_lwp = NULL; /* doesn't match curlwp */
421 
422 	/* process dso's */
423 	rumpuser_dl_bootstrap(add_linkedin_modules,
424 	    rump_kernelfsym_load, rump_component_load, add_static_evcnt);
425 
426 	rump_component_addlocal();
427 	rump_component_init(RUMP_COMPONENT_KERN);
428 
429 	/* initialize factions, if present */
430 	rump_component_init(RUMP__FACTION_VFS);
431 	/* pnbuf_cache is used even without vfs */
432 	if (rump_component_count(RUMP__FACTION_VFS) == 0) {
433 		pnbuf_cache = pool_cache_init(MAXPATHLEN, 0, 0, 0, "pnbufpl",
434 		    NULL, IPL_NONE, NULL, NULL, NULL);
435 	}
436 	rump_component_init(RUMP__FACTION_NET);
437 	rump_component_init(RUMP__FACTION_DEV);
438 	KASSERT(rump_component_count(RUMP__FACTION_VFS) <= 1
439 	    && rump_component_count(RUMP__FACTION_NET) <= 1
440 	    && rump_component_count(RUMP__FACTION_DEV) <= 1);
441 
442 	rump_component_init(RUMP_COMPONENT_KERN_VFS);
443 
444 	/*
445 	 * if we initialized the tty component above, the tyttymtx is
446 	 * now initialized.  otherwise, we need to initialize it.
447 	 */
448 	if (!rump_ttycomponent)
449 		mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_VM);
450 
451 	cold = 0;
452 
453 	sysctl_finalize();
454 
455 	module_init_class(MODULE_CLASS_ANY);
456 
457 	if (rumpuser_getparam(RUMPUSER_PARAM_HOSTNAME,
458 	    hostname, MAXHOSTNAMELEN) != 0) {
459 		panic("mandatory hypervisor configuration (HOSTNAME) missing");
460 	}
461 	hostnamelen = strlen(hostname);
462 
463 	sigemptyset(&sigcantmask);
464 
465 	if (rump_threads)
466 		vmem_rehash_start();
467 
468 	/*
469 	 * Create init (proc 1), used to attach implicit threads in rump.
470 	 * (note: must be done after vfsinit to get cwdi)
471 	 */
472 	initlwp = rump__lwproc_alloclwp(NULL);
473 	mutex_enter(&proc_lock);
474 	initproc = proc_find_raw(1);
475 	mutex_exit(&proc_lock);
476 	if (initproc == NULL)
477 		panic("where in the world is initproc?");
478 	strlcpy(initproc->p_comm, "rumplocal", sizeof(initproc->p_comm));
479 
480 	rump_component_init(RUMP_COMPONENT_POSTINIT);
481 
482 	/* load syscalls */
483 	rump_component_init(RUMP_COMPONENT_SYSCALL);
484 
485 	/* component inits done */
486 	bootlwp = NULL;
487 
488 	/* open 0/1/2 for init */
489 	KASSERT(rump_lwproc_curlwp() == NULL);
490 	rump_lwproc_switch(initlwp);
491 	rump_consdev_init();
492 	rump_lwproc_switch(NULL);
493 
494 	/* release cpu */
495 	rump_unschedule();
496 
497 	return 0;
498 }
499 /* historic compat */
500 __strong_alias(rump__init,rump_init);
501 
502 static int compcounter[RUMP_COMPONENT_MAX];
503 static int compinited[RUMP_COMPONENT_MAX];
504 
505 /*
506  * Yea, this is O(n^2), but we're only looking at a handful of components.
507  * Components are always initialized from the thread that called rump_init().
508  */
509 static LIST_HEAD(, rump_component) rchead = LIST_HEAD_INITIALIZER(rchead);
510 
511 #ifdef RUMP_USE_CTOR
512 struct modinfo_boot_chain modinfo_boot_chain \
513     = LIST_HEAD_INITIALIZER(modinfo_boot_chain);
514 
515 static void
516 rump_component_addlocal(void)
517 {
518 	struct modinfo_chain *mc;
519 
520 	while ((mc = LIST_FIRST(&modinfo_boot_chain)) != NULL) {
521 		LIST_REMOVE(mc, mc_entries);
522 		module_builtin_add(&mc->mc_info, 1, false);
523 	}
524 }
525 
526 #else /* RUMP_USE_CTOR */
527 
528 static void
529 rump_component_addlocal(void)
530 {
531 	__link_set_decl(rump_components, struct rump_component);
532 	struct rump_component *const *rc;
533 
534 	__link_set_foreach(rc, rump_components) {
535 		rump_component_load(*rc);
536 	}
537 }
538 #endif /* RUMP_USE_CTOR */
539 
540 void
541 rump_component_load(const struct rump_component *rc_const)
542 {
543 	struct rump_component *rc, *rc_iter;
544 
545 	/* time for rump component loading and unloading has passed */
546 	if (!cold)
547 		return;
548 
549 	/*
550 	 * XXX: this is ok since the "const" was removed from the
551 	 * definition of RUMP_COMPONENT().
552 	 *
553 	 * However, to preserve the hypercall interface, the const
554 	 * remains here.  This can be fixed in the next hypercall revision.
555 	 */
556 	rc = __UNCONST(rc_const);
557 
558 	KASSERT(!rump_inited || curlwp == bootlwp);
559 
560 	LIST_FOREACH(rc_iter, &rchead, rc_entries) {
561 		if (rc_iter == rc)
562 			return;
563 	}
564 
565 	LIST_INSERT_HEAD(&rchead, rc, rc_entries);
566 	KASSERT(rc->rc_type < RUMP_COMPONENT_MAX);
567 	compcounter[rc->rc_type]++;
568 }
569 
570 void
571 rump_component_unload(struct rump_component *rc)
572 {
573 
574 	/*
575 	 * Checking for cold is enough because rump_init() both
576 	 * flips it and handles component loading.
577 	 */
578 	if (!cold)
579 		return;
580 
581 	LIST_REMOVE(rc, rc_entries);
582 }
583 
584 int
585 rump_component_count(enum rump_component_type type)
586 {
587 
588 	KASSERT(curlwp == bootlwp);
589 	KASSERT(type < RUMP_COMPONENT_MAX);
590 	return compcounter[type];
591 }
592 
593 void
594 rump_component_init(enum rump_component_type type)
595 {
596 	const struct rump_component *rc, *rc_safe;
597 
598 	KASSERT(curlwp == bootlwp);
599 	KASSERT(!compinited[type]);
600 	LIST_FOREACH_SAFE(rc, &rchead, rc_entries, rc_safe) {
601 		if (rc->rc_type == type) {
602 			rc->rc_init();
603 			LIST_REMOVE(rc, rc_entries);
604 		}
605 	}
606 	compinited[type] = 1;
607 }
608 
609 /*
610  * Initialize a module which has already been loaded and linked
611  * with dlopen(). This is fundamentally the same as a builtin module.
612  *
613  * XXX: this interface does not really work in the RUMP_USE_CTOR case,
614  * but I'm not sure it's anything to cry about.  In feeling blue,
615  * things could somehow be handled via modinfo_boot_chain.
616  */
617 int
618 rump_module_init(const struct modinfo * const *mip, size_t nmodinfo)
619 {
620 
621 	return module_builtin_add(mip, nmodinfo, true);
622 }
623 
624 /*
625  * Finish module (flawless victory, fatality!).
626  */
627 int
628 rump_module_fini(const struct modinfo *mi)
629 {
630 
631 	return module_builtin_remove(mi, true);
632 }
633 
634 /*
635  * Add loaded and linked module to the builtin list.  It will
636  * later be initialized with module_init_class().
637  */
638 
639 static void
640 add_linkedin_modules(const struct modinfo * const *mip, size_t nmodinfo)
641 {
642 
643 	module_builtin_add(mip, nmodinfo, false);
644 }
645 
646 /*
647  * Add an evcnt.
648  */
649 static void
650 add_static_evcnt(struct evcnt *ev)
651 {
652 
653 	evcnt_attach_static(ev);
654 }
655 
656 int
657 rump_kernelfsym_load(void *symtab, uint64_t symsize,
658 	char *strtab, uint64_t strsize)
659 {
660 	static int inited = 0;
661 	Elf64_Ehdr ehdr;
662 
663 	if (inited)
664 		return EBUSY;
665 	inited = 1;
666 
667 	/*
668 	 * Use 64bit header since it's bigger.  Shouldn't make a
669 	 * difference, since we're passing in all zeroes anyway.
670 	 */
671 	memset(&ehdr, 0, sizeof(ehdr));
672 	ksyms_addsyms_explicit(&ehdr, symtab, symsize, strtab, strsize);
673 
674 	return 0;
675 }
676 
677 int
678 rump_boot_gethowto()
679 {
680 
681 	return boothowto;
682 }
683 
684 void
685 rump_boot_sethowto(int howto)
686 {
687 
688 	boothowto = howto;
689 }
690 
691 int
692 rump_getversion(void)
693 {
694 
695 	return __NetBSD_Version__;
696 }
697 /* compat */
698 __strong_alias(rump_pub_getversion,rump_getversion);
699 
700 /*
701  * Note: may be called unscheduled.  Not fully safe since no locking
702  * of allevents (currently that's not even available).
703  */
704 void
705 rump_printevcnts()
706 {
707 	struct evcnt *ev;
708 
709 	TAILQ_FOREACH(ev, &allevents, ev_list)
710 		rumpuser_dprintf("%s / %s: %" PRIu64 "\n",
711 		    ev->ev_group, ev->ev_name, ev->ev_count);
712 }
713 
714 /*
715  * If you use this interface ... well ... all bets are off.
716  * The original purpose is for the p2k fs server library to be
717  * able to use the same pid/lid for VOPs as the host kernel.
718  */
719 void
720 rump_allbetsareoff_setid(pid_t pid, int lid)
721 {
722 	struct lwp *l = curlwp;
723 	struct proc *p = l->l_proc;
724 
725 	l->l_lid = lid;
726 	p->p_pid = pid;
727 }
728 
729 static void
730 ipiemu(void *a1, void *a2)
731 {
732 
733 	xc__highpri_intr(NULL);
734 }
735 
736 void
737 rump_xc_highpri(struct cpu_info *ci)
738 {
739 
740 	if (ci)
741 		xc_unicast(0, ipiemu, NULL, NULL, ci);
742 	else
743 		xc_broadcast(0, ipiemu, NULL, NULL);
744 }
745 
746 int
747 rump_syscall(int num, void *data, size_t dlen, register_t *retval)
748 {
749 	struct proc *p;
750 	struct emul *e;
751 	struct sysent *callp;
752 	const int *etrans = NULL;
753 	int rv;
754 
755 	rump_schedule();
756 	p = curproc;
757 	e = p->p_emul;
758 #ifndef __HAVE_MINIMAL_EMUL
759 	num &= e->e_nsysent - 1;
760 #else
761 	num &= SYS_NSYSENT - 1;
762 #endif
763 	callp = e->e_sysent + num;
764 
765 	rv = sy_invoke(callp, curlwp, data, retval, num);
766 
767 	/*
768 	 * I hope that (!__HAVE_MINIMAL_EMUL || __HAVE_SYSCALL_INTERN) is
769 	 * an invariant ...
770 	 */
771 #if !defined(__HAVE_MINIMAL_EMUL)
772 	etrans = e->e_errno;
773 #elif defined(__HAVE_SYSCALL_INTERN)
774 	etrans = p->p_emuldata;
775 #endif
776 
777 	if (etrans) {
778 		rv = etrans[rv];
779 		/*
780 		 * XXX: small hack since Linux etrans vectors on some
781 		 * archs contain negative errnos, but rump_syscalls
782 		 * uses the -1 + errno ABI.  Note that these
783 		 * negative values are always the result of translation,
784 		 * otherwise the above translation method would not
785 		 * work very well.
786 		 */
787 		if (rv < 0)
788 			rv = -rv;
789 	}
790 	rump_unschedule();
791 
792 	return rv;
793 }
794 
795 void
796 rump_syscall_boot_establish(const struct rump_onesyscall *calls, size_t ncall)
797 {
798 	struct sysent *callp;
799 	size_t i;
800 
801 	for (i = 0; i < ncall; i++) {
802 		callp = rump_sysent + calls[i].ros_num;
803 		KASSERT(bootlwp != NULL
804 		    && callp->sy_call == (sy_call_t *)(void *)enosys);
805 		callp->sy_call = calls[i].ros_handler;
806 	}
807 }
808 
809 struct rump_boot_etfs *ebstart;
810 void
811 rump_boot_etfs_register(struct rump_boot_etfs *eb)
812 {
813 
814 	/*
815 	 * Could use atomics, but, since caller would need to synchronize
816 	 * against calling rump_init() anyway, easier to just specify the
817 	 * interface as "caller serializes".  This solve-by-specification
818 	 * approach avoids the grey area of using atomics before rump_init()
819 	 * runs.
820 	 */
821 	eb->_eb_next = ebstart;
822 	eb->eb_status = -1;
823 	ebstart = eb;
824 }
825