1/* $NetBSD: emul.c,v 1.191 2019/06/02 19:41:51 kre 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: emul.c,v 1.191 2019/06/02 19:41:51 kre Exp $");
30
31#include <sys/param.h>
32#include <sys/cprng.h>
33#include <sys/filedesc.h>
34#include <sys/fstrans.h>
35#include <sys/kauth.h>
36#include <sys/module.h>
37#include <sys/reboot.h>
38#include <sys/syscall.h>
39#include <sys/pserialize.h>
40#ifdef LOCKDEBUG
41#include <sys/sleepq.h>
42#endif
43
44#include <dev/cons.h>
45
46#include <rump-sys/kern.h>
47
48#include <rump/rumpuser.h>
49
50void (*rump_vfs_fini)(void) = (void *)nullop;
51
52/*
53 * physmem is largely unused (except for nmbcluster calculations),
54 * so pick a default value which suits ZFS. if an application wants
55 * a very small memory footprint, it can still adjust this before
56 * calling rump_init()
57 */
58#define PHYSMEM 512*256
59psize_t physmem = PHYSMEM;
60int nkmempages = PHYSMEM/2; /* from le chapeau */
61#undef PHYSMEM
62
63struct vnode *rootvp;
64dev_t rootdev = NODEV;
65
66const int schedppq = 1;
67bool mp_online = false;
68struct timespec boottime;
69int cold = 1;
70int boothowto = AB_SILENT;
71struct tty *constty;
72
73const struct bdevsw *bdevsw0[255];
74const struct bdevsw **bdevsw = bdevsw0;
75const int sys_cdevsws = 255;
76int max_cdevsws = 255;
77
78const struct cdevsw *cdevsw0[255];
79const struct cdevsw **cdevsw = cdevsw0;
80const int sys_bdevsws = 255;
81int max_bdevsws = 255;
82
83int mem_no = 2;
84
85device_t booted_device;
86device_t booted_wedge;
87int booted_partition;
88const char *booted_method;
89
90/* XXX: unused */
91kmutex_t tty_lock;
92krwlock_t exec_lock;
93
94/* sparc doesn't sport constant page size, pretend we have 4k pages */
95#ifdef __sparc__
96int nbpg = 4096;
97int pgofset = 4096-1;
98int pgshift = 12;
99#endif
100
101/* on sun3 VM_MAX_ADDRESS is a const variable */
102/* XXX: should be moved into rump.c and initialize for sun3 and sun3x? */
103#ifdef sun3
104const vaddr_t kernbase = KERNBASE3;
105#endif
106
107struct loadavg averunnable = {
108 { 0 * FSCALE,
109 1 * FSCALE,
110 11 * FSCALE, },
111 FSCALE,
112};
113
114/*
115 * Include the autogenerated list of auto-loadable syscalls
116 */
117#include <kern/syscalls_autoload.c>
118
119struct emul emul_netbsd = {
120 .e_name = "netbsd-rump",
121 .e_sysent = rump_sysent,
122 .e_nomodbits = rump_sysent_nomodbits,
123#ifndef __HAVE_MINIMAL_EMUL
124 .e_nsysent = SYS_NSYSENT,
125#endif
126 .e_vm_default_addr = uvm_default_mapaddr,
127#ifdef __HAVE_SYSCALL_INTERN
128 .e_syscall_intern = syscall_intern,
129#endif
130 .e_sc_autoload = netbsd_syscalls_autoload,
131};
132
133cprng_strong_t *kern_cprng;
134
135/* not used, but need the symbols for pointer comparisons */
136syncobj_t mutex_syncobj, rw_syncobj;
137
138int
139kpause(const char *wmesg, bool intr, int timeo, kmutex_t *mtx)
140{
141 extern int hz;
142 int rv __diagused;
143 uint64_t sec, nsec;
144
145 if (mtx)
146 mutex_exit(mtx);
147
148 sec = timeo / hz;
149 nsec = (timeo % hz) * (1000000000 / hz);
150 rv = rumpuser_clock_sleep(RUMPUSER_CLOCK_RELWALL, sec, nsec);
151 KASSERT(rv == 0);
152
153 if (mtx)
154 mutex_enter(mtx);
155
156 return 0;
157}
158
159vaddr_t
160calc_cache_size(vsize_t vasz, int pct, int va_pct)
161{
162 paddr_t t;
163
164 t = (paddr_t)physmem * pct / 100 * PAGE_SIZE;
165 if ((vaddr_t)t != t) {
166 panic("%s: needs tweak", __func__);
167 }
168 return t;
169}
170
171#define RETURN_ADDRESS (uintptr_t)__builtin_return_address(0)
172
173void
174assert_sleepable(void)
175{
176 const char *reason = NULL;
177
178 /* always sleepable, although we should improve this */
179
180 if (!pserialize_not_in_read_section()) {
181 reason = "pserialize";
182 }
183
184 if (reason) {
185 panic("%s: %s caller=%p", __func__, reason,
186 (void *)RETURN_ADDRESS);
187 }
188}
189
190void
191module_init_md(void)
192{
193
194 /*
195 * Nothing for now. However, we should load the librump
196 * symbol table.
197 */
198}
199
200/*
201 * Try to emulate all the MD definitions of DELAY() / delay().
202 * Would be nice to fix the #defines in MD headers, but this quicker.
203 *
204 * XXX: we'd need a rumpuser_clock_sleep_nowrap() here. Since we
205 * don't have it in the current hypercall revision, busyloop.
206 * Note that rather than calibrate a loop delay and work with that,
207 * get call gettime (which does not block) in a loop to make sure
208 * we didn't get virtual ghosttime. That might be slightly inaccurate
209 * for very small delays ...
210 *
211 * The other option would be to run a thread in the hypervisor which
212 * sleeps for us and we can wait for it using rumpuser_cv_wait_nowrap()
213 * Probably too fussy. Better just wait for hypercall rev 18 ;)
214 */
215static void
216rump_delay(unsigned int us)
217{
218 struct timespec target, tmp;
219 uint64_t sec, sec_ini, sec_now;
220 long nsec, nsec_ini, nsec_now;
221 int loops;
222
223 rumpuser_clock_gettime(RUMPUSER_CLOCK_ABSMONO, &sec_ini, &nsec_ini);
224
225#ifdef __mac68k__
226 sec = us / 1000;
227 nsec = (us % 1000) * 1000000;
228#else
229 sec = us / 1000000;
230 nsec = (us % 1000000) * 1000;
231#endif
232
233 target.tv_sec = sec_ini;
234 tmp.tv_sec = sec;
235 target.tv_nsec = nsec_ini;
236 tmp.tv_nsec = nsec;
237 timespecadd(&target, &tmp, &target);
238
239 if (__predict_false(sec != 0))
240 printf("WARNING: over 1s delay\n");
241
242 for (loops = 0; loops < 1000*1000*100; loops++) {
243 struct timespec cur;
244
245 rumpuser_clock_gettime(RUMPUSER_CLOCK_ABSMONO,
246 &sec_now, &nsec_now);
247 cur.tv_sec = sec_now;
248 cur.tv_nsec = nsec_now;
249 if (timespeccmp(&cur, &target, >=)) {
250 return;
251 }
252 }
253 printf("WARNING: DELAY ESCAPED\n");
254}
255void (*delay_func)(unsigned int) = rump_delay;
256__strong_alias(delay,rump_delay);
257__strong_alias(_delay,rump_delay);
258
259/* Weak alias for getcwd_common to be used unless librumpvfs is present. */
260
261int rump_getcwd_common(struct vnode *, struct vnode *, char **, char *,
262 int, int, struct lwp *);
263int
264rump_getcwd_common(struct vnode *lvp, struct vnode *rvp, char **bpp, char *bufp,
265 int limit, int flags, struct lwp *l)
266{
267
268 return ENOENT;
269}
270__weak_alias(getcwd_common,rump_getcwd_common);
271
272/* Weak aliases for fstrans to be used unless librumpvfs is present. */
273
274void rump_fstrans_start(struct mount *);
275void
276rump_fstrans_start(struct mount *mp)
277{
278
279}
280__weak_alias(fstrans_start,rump_fstrans_start);
281
282int rump_fstrans_start_nowait(struct mount *);
283int
284rump_fstrans_start_nowait(struct mount *mp)
285{
286
287 return 0;
288}
289__weak_alias(fstrans_start_nowait,rump_fstrans_start_nowait);
290
291void rump_fstrans_start_lazy(struct mount *);
292void
293rump_fstrans_start_lazy(struct mount *mp)
294{
295
296}
297__weak_alias(fstrans_start_lazy,rump_fstrans_start_lazy);
298
299
300void rump_fstrans_done(struct mount *);
301void
302rump_fstrans_done(struct mount *mp)
303{
304
305}
306__weak_alias(fstrans_done,rump_fstrans_done);
307
308
309void rump_fstrans_lwp_dtor(struct lwp *);
310void
311rump_fstrans_lwp_dtor(struct lwp *l)
312{
313
314}
315__weak_alias(fstrans_lwp_dtor,rump_fstrans_lwp_dtor);
316
317/*
318 * Provide weak aliases for tty routines used by printf.
319 * They will be used unless the rumpkern_tty component is present.
320 */
321
322int rump_ttycheckoutq(struct tty *, int);
323int
324rump_ttycheckoutq(struct tty *tp, int wait)
325{
326
327 return 1;
328}
329__weak_alias(ttycheckoutq,rump_ttycheckoutq);
330
331int rump_tputchar(int, int, struct tty *);
332int
333rump_tputchar(int c, int flags, struct tty *tp)
334{
335
336 cnputc(c);
337 return 0;
338}
339__weak_alias(tputchar,rump_tputchar);
340
341void
342cnputc(int c)
343{
344
345 rumpuser_putchar(c);
346}
347
348void
349cnflush(void)
350{
351
352 /* done */
353}
354
355void
356resettodr(void)
357{
358
359 /* setting clocks is not in the jurisdiction of rump kernels */
360}
361
362#ifdef __HAVE_SYSCALL_INTERN
363void
364syscall_intern(struct proc *p)
365{
366
367 p->p_emuldata = NULL;
368}
369#endif
370
371#ifdef LOCKDEBUG
372void
373turnstile_print(volatile void *obj, void (*pr)(const char *, ...))
374{
375
376 /* nada */
377}
378#endif
379
380void
381cpu_reboot(int howto, char *bootstr)
382{
383 int ruhow = 0;
384 void *finiarg;
385
386 printf("rump kernel halting...\n");
387
388 if (!RUMP_LOCALPROC_P(curproc))
389 finiarg = RUMP_SPVM2CTL(curproc->p_vmspace);
390 else
391 finiarg = NULL;
392
393 /* dump means we really take the dive here */
394 if ((howto & RB_DUMP) || panicstr) {
395 ruhow = RUMPUSER_PANIC;
396 goto out;
397 }
398
399 /* try to sync */
400 if (!((howto & RB_NOSYNC) || panicstr)) {
401 rump_vfs_fini();
402 }
403
404 doshutdownhooks();
405
406 /* your wish is my command */
407 if (howto & RB_HALT) {
408 printf("rump kernel halted (with RB_HALT, not exiting)\n");
409 rump_sysproxy_fini(finiarg);
410 for (;;) {
411 rumpuser_clock_sleep(RUMPUSER_CLOCK_RELWALL, 10, 0);
412 }
413 }
414
415 /* this function is __dead, we must exit */
416 out:
417 rump_sysproxy_fini(finiarg);
418 rumpuser_exit(ruhow);
419}
420
421const char *
422cpu_getmodel(void)
423{
424
425 return "rumpcore (virtual)";
426}
427