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emul.c revision 1.167 
      1 /*	$NetBSD: emul.c,v 1.167 2014/11/18 13:05:33 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 1.167 2014/11/18 13:05:33 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 int hardclock_ticks;
     89 bool mp_online = false;
     90 struct timeval boottime;
     91 int cold = 1;
     92 int boothowto = AB_SILENT;
     93 struct tty *constty;
     94 
     95 const struct bdevsw *bdevsw0[255];
     96 const struct bdevsw **bdevsw = bdevsw0;
     97 const int sys_cdevsws = 255;
     98 int max_cdevsws = 255;
     99 
    100 const struct cdevsw *cdevsw0[255];
    101 const struct cdevsw **cdevsw = cdevsw0;
    102 const int sys_bdevsws = 255;
    103 int max_bdevsws = 255;
    104 
    105 int mem_no = 2;
    106 
    107 device_t booted_device;
    108 device_t booted_wedge;
    109 int booted_partition;
    110 
    111 /* XXX: unused */
    112 kmutex_t tty_lock;
    113 krwlock_t exec_lock;
    114 
    115 struct lwplist alllwp = LIST_HEAD_INITIALIZER(alllwp);
    116 
    117 /* sparc doesn't sport constant page size, pretend we have 4k pages */
    118 #ifdef __sparc__
    119 int nbpg = 4096;
    120 int pgofset = 4096-1;
    121 int pgshift = 12;
    122 #endif
    123 
    124 /* on sun3 VM_MAX_ADDRESS is a const variable */
    125 /* XXX: should be moved into rump.c and initialize for sun3 and sun3x? */
    126 #ifdef sun3
    127 const vaddr_t kernbase = KERNBASE3;
    128 #endif
    129 
    130 struct loadavg averunnable = {
    131 	{ 0 * FSCALE,
    132 	  1 * FSCALE,
    133 	  11 * FSCALE, },
    134 	FSCALE,
    135 };
    136 
    137 struct emul emul_netbsd = {
    138 	.e_name = "netbsd-rump",
    139 	.e_sysent = rump_sysent,
    140 #ifndef __HAVE_MINIMAL_EMUL
    141 	.e_nsysent = SYS_NSYSENT,
    142 #endif
    143 	.e_vm_default_addr = uvm_default_mapaddr,
    144 #ifdef __HAVE_SYSCALL_INTERN
    145 	.e_syscall_intern = syscall_intern,
    146 #endif
    147 };
    148 
    149 u_int nprocs = 1;
    150 
    151 cprng_strong_t *kern_cprng;
    152 
    153 /* not used, but need the symbols for pointer comparisons */
    154 syncobj_t mutex_syncobj, rw_syncobj;
    155 
    156 int
    157 kpause(const char *wmesg, bool intr, int timeo, kmutex_t *mtx)
    158 {
    159 	extern int hz;
    160 	int rv __diagused;
    161 	uint64_t sec, nsec;
    162 
    163 	if (mtx)
    164 		mutex_exit(mtx);
    165 
    166 	sec = timeo / hz;
    167 	nsec = (timeo % hz) * (1000000000 / hz);
    168 	rv = rumpuser_clock_sleep(RUMPUSER_CLOCK_RELWALL, sec, nsec);
    169 	KASSERT(rv == 0);
    170 
    171 	if (mtx)
    172 		mutex_enter(mtx);
    173 
    174 	return 0;
    175 }
    176 
    177 void
    178 lwp_unsleep(lwp_t *l, bool cleanup)
    179 {
    180 
    181 	KASSERT(mutex_owned(l->l_mutex));
    182 
    183 	(*l->l_syncobj->sobj_unsleep)(l, cleanup);
    184 }
    185 
    186 void
    187 lwp_update_creds(struct lwp *l)
    188 {
    189 	struct proc *p;
    190 	kauth_cred_t oldcred;
    191 
    192 	p = l->l_proc;
    193 	oldcred = l->l_cred;
    194 	l->l_prflag &= ~LPR_CRMOD;
    195 
    196 	mutex_enter(p->p_lock);
    197 	kauth_cred_hold(p->p_cred);
    198 	l->l_cred = p->p_cred;
    199 	mutex_exit(p->p_lock);
    200 
    201 	if (oldcred != NULL)
    202 		kauth_cred_free(oldcred);
    203 }
    204 
    205 vaddr_t
    206 calc_cache_size(vsize_t vasz, int pct, int va_pct)
    207 {
    208 	paddr_t t;
    209 
    210 	t = (paddr_t)physmem * pct / 100 * PAGE_SIZE;
    211 	if ((vaddr_t)t != t) {
    212 		panic("%s: needs tweak", __func__);
    213 	}
    214 	return t;
    215 }
    216 
    217 void
    218 assert_sleepable(void)
    219 {
    220 
    221 	/* always sleepable, although we should improve this */
    222 }
    223 
    224 void
    225 module_init_md(void)
    226 {
    227 
    228 	/*
    229 	 * Nothing for now.  However, we should load the librump
    230 	 * symbol table.
    231 	 */
    232 }
    233 
    234 /*
    235  * Try to emulate all the MD definitions of DELAY() / delay().
    236  * Would be nice to fix the #defines in MD headers, but this quicker.
    237  */
    238 static void
    239 rump_delay(unsigned int us)
    240 {
    241 	uint64_t sec, nsec;
    242 
    243 #ifdef __mac68k__
    244 	sec = us / 1000;
    245 	nsec = (us % 1000) * 1000000;
    246 #else
    247 	sec = us / 1000000;
    248 	nsec = (us % 1000000) * 1000;
    249 #endif
    250 
    251 	if (__predict_false(sec != 0))
    252 		printf("WARNING: over 1s delay\n");
    253 
    254 	rumpuser_clock_sleep(RUMPUSER_CLOCK_RELWALL, sec, nsec);
    255 }
    256 void (*delay_func)(unsigned int) = rump_delay;
    257 __strong_alias(delay,rump_delay);
    258 __strong_alias(_delay,rump_delay);
    259 
    260 /*
    261  * Provide weak aliases for tty routines used by printf.
    262  * They will be used unless the rumpkern_tty component is present.
    263  */
    264 
    265 int rump_ttycheckoutq(struct tty *, int);
    266 int
    267 rump_ttycheckoutq(struct tty *tp, int wait)
    268 {
    269 
    270 	return 1;
    271 }
    272 __weak_alias(ttycheckoutq,rump_ttycheckoutq);
    273 
    274 int rump_tputchar(int, int, struct tty *);
    275 int
    276 rump_tputchar(int c, int flags, struct tty *tp)
    277 {
    278 
    279 	cnputc(c);
    280 	return 0;
    281 }
    282 __weak_alias(tputchar,rump_tputchar);
    283 
    284 void
    285 cnputc(int c)
    286 {
    287 
    288 	rumpuser_putchar(c);
    289 }
    290 
    291 void
    292 cnflush(void)
    293 {
    294 
    295 	/* done */
    296 }
    297 
    298 void
    299 resettodr(void)
    300 {
    301 
    302 	/* setting clocks is not in the jurisdiction of rump kernels */
    303 }
    304 
    305 #ifdef __HAVE_SYSCALL_INTERN
    306 void
    307 syscall_intern(struct proc *p)
    308 {
    309 
    310 	p->p_emuldata = NULL;
    311 }
    312 #endif
    313 
    314 #ifdef LOCKDEBUG
    315 void
    316 turnstile_print(volatile void *obj, void (*pr)(const char *, ...))
    317 {
    318 
    319 	/* nada */
    320 }
    321 #endif
    322 
    323 void
    324 cpu_reboot(int howto, char *bootstr)
    325 {
    326 	int ruhow = 0;
    327 	void *finiarg;
    328 
    329 	printf("rump kernel halting...\n");
    330 
    331 	if (!RUMP_LOCALPROC_P(curproc))
    332 		finiarg = curproc->p_vmspace->vm_map.pmap;
    333 	else
    334 		finiarg = NULL;
    335 
    336 	/* dump means we really take the dive here */
    337 	if ((howto & RB_DUMP) || panicstr) {
    338 		ruhow = RUMPUSER_PANIC;
    339 		goto out;
    340 	}
    341 
    342 	/* try to sync */
    343 	if (!((howto & RB_NOSYNC) || panicstr)) {
    344 		rump_vfs_fini();
    345 	}
    346 
    347 	doshutdownhooks();
    348 
    349 	/* your wish is my command */
    350 	if (howto & RB_HALT) {
    351 		printf("rump kernel halted\n");
    352 		rumpuser_sp_fini(finiarg);
    353 		for (;;) {
    354 			rumpuser_clock_sleep(RUMPUSER_CLOCK_RELWALL, 10, 0);
    355 		}
    356 	}
    357 
    358 	/* this function is __dead, we must exit */
    359  out:
    360 	printf("halted\n");
    361 	rumpuser_sp_fini(finiarg);
    362 	rumpuser_exit(ruhow);
    363 }
    364