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emul.c revision 1.173 
      1 /*	$NetBSD: emul.c,v 1.173 2015/08/25 14:47:26 pooka 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 1.173 2015/08/25 14:47:26 pooka Exp $");
     30 
     31 #include <sys/param.h>
     32 #include <sys/null.h>
     33 #include <sys/vnode.h>
     34 #include <sys/stat.h>
     35 #include <sys/select.h>
     36 #include <sys/syslog.h>
     37 #include <sys/namei.h>
     38 #include <sys/kauth.h>
     39 #include <sys/conf.h>
     40 #include <sys/device.h>
     41 #include <sys/queue.h>
     42 #include <sys/file.h>
     43 #include <sys/filedesc.h>
     44 #include <sys/cpu.h>
     45 #include <sys/kmem.h>
     46 #include <sys/poll.h>
     47 #include <sys/timetc.h>
     48 #include <sys/tprintf.h>
     49 #include <sys/module.h>
     50 #include <sys/tty.h>
     51 #include <sys/reboot.h>
     52 #include <sys/syscall.h>
     53 #include <sys/syscallvar.h>
     54 #include <sys/xcall.h>
     55 #include <sys/sleepq.h>
     56 #include <sys/cprng.h>
     57 
     58 #include <dev/cons.h>
     59 
     60 #include <rump/rumpuser.h>
     61 
     62 #include <uvm/uvm_map.h>
     63 
     64 #include "rump_private.h"
     65 
     66 void (*rump_vfs_fini)(void) = (void *)nullop;
     67 
     68 /*
     69  * physmem is largely unused (except for nmbcluster calculations),
     70  * so pick a default value which suits ZFS.  if an application wants
     71  * a very small memory footprint, it can still adjust this before
     72  * calling rump_init()
     73  */
     74 #define PHYSMEM 512*256
     75 int physmem = PHYSMEM;
     76 int nkmempages = PHYSMEM/2; /* from le chapeau */
     77 #undef PHYSMEM
     78 
     79 struct lwp lwp0 = {
     80 	.l_lid = 1,
     81 	.l_proc = &proc0,
     82 	.l_fd = &filedesc0,
     83 };
     84 struct vnode *rootvp;
     85 dev_t rootdev = NODEV;
     86 
     87 const int schedppq = 1;
     88 bool mp_online = false;
     89 struct timeval boottime;
     90 int cold = 1;
     91 int boothowto = AB_SILENT;
     92 struct tty *constty;
     93 
     94 const struct bdevsw *bdevsw0[255];
     95 const struct bdevsw **bdevsw = bdevsw0;
     96 const int sys_cdevsws = 255;
     97 int max_cdevsws = 255;
     98 
     99 const struct cdevsw *cdevsw0[255];
    100 const struct cdevsw **cdevsw = cdevsw0;
    101 const int sys_bdevsws = 255;
    102 int max_bdevsws = 255;
    103 
    104 int mem_no = 2;
    105 
    106 device_t booted_device;
    107 device_t booted_wedge;
    108 int booted_partition;
    109 
    110 /* XXX: unused */
    111 kmutex_t tty_lock;
    112 krwlock_t exec_lock;
    113 
    114 struct lwplist alllwp = LIST_HEAD_INITIALIZER(alllwp);
    115 
    116 /* sparc doesn't sport constant page size, pretend we have 4k pages */
    117 #ifdef __sparc__
    118 int nbpg = 4096;
    119 int pgofset = 4096-1;
    120 int pgshift = 12;
    121 #endif
    122 
    123 /* on sun3 VM_MAX_ADDRESS is a const variable */
    124 /* XXX: should be moved into rump.c and initialize for sun3 and sun3x? */
    125 #ifdef sun3
    126 const vaddr_t kernbase = KERNBASE3;
    127 #endif
    128 
    129 struct loadavg averunnable = {
    130 	{ 0 * FSCALE,
    131 	  1 * FSCALE,
    132 	  11 * FSCALE, },
    133 	FSCALE,
    134 };
    135 
    136 struct emul emul_netbsd = {
    137 	.e_name = "netbsd-rump",
    138 	.e_sysent = rump_sysent,
    139 #ifndef __HAVE_MINIMAL_EMUL
    140 	.e_nsysent = SYS_NSYSENT,
    141 #endif
    142 	.e_vm_default_addr = uvm_default_mapaddr,
    143 #ifdef __HAVE_SYSCALL_INTERN
    144 	.e_syscall_intern = syscall_intern,
    145 #endif
    146 };
    147 
    148 u_int nprocs = 1;
    149 
    150 cprng_strong_t *kern_cprng;
    151 
    152 /* not used, but need the symbols for pointer comparisons */
    153 syncobj_t mutex_syncobj, rw_syncobj;
    154 
    155 int
    156 kpause(const char *wmesg, bool intr, int timeo, kmutex_t *mtx)
    157 {
    158 	extern int hz;
    159 	int rv __diagused;
    160 	uint64_t sec, nsec;
    161 
    162 	if (mtx)
    163 		mutex_exit(mtx);
    164 
    165 	sec = timeo / hz;
    166 	nsec = (timeo % hz) * (1000000000 / hz);
    167 	rv = rumpuser_clock_sleep(RUMPUSER_CLOCK_RELWALL, sec, nsec);
    168 	KASSERT(rv == 0);
    169 
    170 	if (mtx)
    171 		mutex_enter(mtx);
    172 
    173 	return 0;
    174 }
    175 
    176 void
    177 lwp_unsleep(lwp_t *l, bool cleanup)
    178 {
    179 
    180 	KASSERT(mutex_owned(l->l_mutex));
    181 
    182 	(*l->l_syncobj->sobj_unsleep)(l, cleanup);
    183 }
    184 
    185 void
    186 lwp_update_creds(struct lwp *l)
    187 {
    188 	struct proc *p;
    189 	kauth_cred_t oldcred;
    190 
    191 	p = l->l_proc;
    192 	oldcred = l->l_cred;
    193 	l->l_prflag &= ~LPR_CRMOD;
    194 
    195 	mutex_enter(p->p_lock);
    196 	kauth_cred_hold(p->p_cred);
    197 	l->l_cred = p->p_cred;
    198 	mutex_exit(p->p_lock);
    199 
    200 	if (oldcred != NULL)
    201 		kauth_cred_free(oldcred);
    202 }
    203 
    204 vaddr_t
    205 calc_cache_size(vsize_t vasz, int pct, int va_pct)
    206 {
    207 	paddr_t t;
    208 
    209 	t = (paddr_t)physmem * pct / 100 * PAGE_SIZE;
    210 	if ((vaddr_t)t != t) {
    211 		panic("%s: needs tweak", __func__);
    212 	}
    213 	return t;
    214 }
    215 
    216 void
    217 assert_sleepable(void)
    218 {
    219 
    220 	/* always sleepable, although we should improve this */
    221 }
    222 
    223 void
    224 module_init_md(void)
    225 {
    226 
    227 	/*
    228 	 * Nothing for now.  However, we should load the librump
    229 	 * symbol table.
    230 	 */
    231 }
    232 
    233 /*
    234  * Try to emulate all the MD definitions of DELAY() / delay().
    235  * Would be nice to fix the #defines in MD headers, but this quicker.
    236  *
    237  * XXX: we'd need a rumpuser_clock_sleep_nowrap() here.  Since we
    238  * don't have it in the current hypercall revision, busyloop.
    239  * Note that rather than calibrate a loop delay and work with that,
    240  * get call gettime (which does not block) in a loop to make sure
    241  * we didn't get virtual ghosttime.  That might be slightly inaccurate
    242  * for very small delays ...
    243  *
    244  * The other option would be to run a thread in the hypervisor which
    245  * sleeps for us and we can wait for it using rumpuser_cv_wait_nowrap()
    246  * Probably too fussy.  Better just wait for hypercall rev 18 ;)
    247  */
    248 static void
    249 rump_delay(unsigned int us)
    250 {
    251 	struct timespec target, tmp;
    252 	uint64_t sec, sec_ini, sec_now;
    253 	long nsec, nsec_ini, nsec_now;
    254 	int loops;
    255 
    256 	rumpuser_clock_gettime(RUMPUSER_CLOCK_ABSMONO, &sec_ini, &nsec_ini);
    257 
    258 #ifdef __mac68k__
    259 	sec = us / 1000;
    260 	nsec = (us % 1000) * 1000000;
    261 #else
    262 	sec = us / 1000000;
    263 	nsec = (us % 1000000) * 1000;
    264 #endif
    265 
    266 	target.tv_sec = sec_ini;
    267 	tmp.tv_sec = sec;
    268 	target.tv_nsec = nsec_ini;
    269 	tmp.tv_nsec = nsec;
    270 	timespecadd(&target, &tmp, &target);
    271 
    272 	if (__predict_false(sec != 0))
    273 		printf("WARNING: over 1s delay\n");
    274 
    275 	for (loops = 0; loops < 1000*1000*100; loops++) {
    276 		struct timespec cur;
    277 
    278 		rumpuser_clock_gettime(RUMPUSER_CLOCK_ABSMONO,
    279 		    &sec_now, &nsec_now);
    280 		cur.tv_sec = sec_now;
    281 		cur.tv_nsec = nsec_now;
    282 		if (timespeccmp(&cur, &target, >=)) {
    283 			return;
    284 		}
    285 	}
    286 	printf("WARNING: DELAY ESCAPED\n");
    287 }
    288 void (*delay_func)(unsigned int) = rump_delay;
    289 __strong_alias(delay,rump_delay);
    290 __strong_alias(_delay,rump_delay);
    291 
    292 /*
    293  * Provide weak aliases for tty routines used by printf.
    294  * They will be used unless the rumpkern_tty component is present.
    295  */
    296 
    297 int rump_ttycheckoutq(struct tty *, int);
    298 int
    299 rump_ttycheckoutq(struct tty *tp, int wait)
    300 {
    301 
    302 	return 1;
    303 }
    304 __weak_alias(ttycheckoutq,rump_ttycheckoutq);
    305 
    306 int rump_tputchar(int, int, struct tty *);
    307 int
    308 rump_tputchar(int c, int flags, struct tty *tp)
    309 {
    310 
    311 	cnputc(c);
    312 	return 0;
    313 }
    314 __weak_alias(tputchar,rump_tputchar);
    315 
    316 void
    317 cnputc(int c)
    318 {
    319 
    320 	rumpuser_putchar(c);
    321 }
    322 
    323 void
    324 cnflush(void)
    325 {
    326 
    327 	/* done */
    328 }
    329 
    330 void
    331 resettodr(void)
    332 {
    333 
    334 	/* setting clocks is not in the jurisdiction of rump kernels */
    335 }
    336 
    337 #ifdef __HAVE_SYSCALL_INTERN
    338 void
    339 syscall_intern(struct proc *p)
    340 {
    341 
    342 	p->p_emuldata = NULL;
    343 }
    344 #endif
    345 
    346 #ifdef LOCKDEBUG
    347 void
    348 turnstile_print(volatile void *obj, void (*pr)(const char *, ...))
    349 {
    350 
    351 	/* nada */
    352 }
    353 #endif
    354 
    355 void
    356 cpu_reboot(int howto, char *bootstr)
    357 {
    358 	int ruhow = 0;
    359 	void *finiarg;
    360 
    361 	printf("rump kernel halting...\n");
    362 
    363 	if (!RUMP_LOCALPROC_P(curproc))
    364 		finiarg = RUMP_SPVM2CTL(curproc->p_vmspace);
    365 	else
    366 		finiarg = NULL;
    367 
    368 	/* dump means we really take the dive here */
    369 	if ((howto & RB_DUMP) || panicstr) {
    370 		ruhow = RUMPUSER_PANIC;
    371 		goto out;
    372 	}
    373 
    374 	/* try to sync */
    375 	if (!((howto & RB_NOSYNC) || panicstr)) {
    376 		rump_vfs_fini();
    377 	}
    378 
    379 	doshutdownhooks();
    380 
    381 	/* your wish is my command */
    382 	if (howto & RB_HALT) {
    383 		printf("rump kernel halted (with RB_HALT, not exiting)\n");
    384 		rump_sysproxy_fini(finiarg);
    385 		for (;;) {
    386 			rumpuser_clock_sleep(RUMPUSER_CLOCK_RELWALL, 10, 0);
    387 		}
    388 	}
    389 
    390 	/* this function is __dead, we must exit */
    391  out:
    392 	rump_sysproxy_fini(finiarg);
    393 	rumpuser_exit(ruhow);
    394 }
    395 
    396 const char *
    397 cpu_getmodel(void)
    398 {
    399 
    400 	return "rumpcore (virtual)";
    401 }
    402