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 50 void (*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 59 psize_t physmem = PHYSMEM; 60 int nkmempages = PHYSMEM/2; /* from le chapeau */ 61 #undef PHYSMEM 62 63 struct vnode *rootvp; 64 dev_t rootdev = NODEV; 65 66 const int schedppq = 1; 67 bool mp_online = false; 68 struct timespec boottime; 69 int cold = 1; 70 int boothowto = AB_SILENT; 71 struct tty *constty; 72 73 const struct bdevsw *bdevsw0[255]; 74 const struct bdevsw **bdevsw = bdevsw0; 75 const int sys_cdevsws = 255; 76 int max_cdevsws = 255; 77 78 const struct cdevsw *cdevsw0[255]; 79 const struct cdevsw **cdevsw = cdevsw0; 80 const int sys_bdevsws = 255; 81 int max_bdevsws = 255; 82 83 int mem_no = 2; 84 85 device_t booted_device; 86 device_t booted_wedge; 87 int booted_partition; 88 const char *booted_method; 89 90 /* XXX: unused */ 91 kmutex_t tty_lock; 92 krwlock_t exec_lock; 93 94 /* sparc doesn't sport constant page size, pretend we have 4k pages */ 95 #ifdef __sparc__ 96 int nbpg = 4096; 97 int pgofset = 4096-1; 98 int 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 104 const vaddr_t kernbase = KERNBASE3; 105 #endif 106 107 struct 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> 118 119 struct 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 }; 132 133 cprng_strong_t *kern_cprng; 134 135 /* not used, but need the symbols for pointer comparisons */ 136 syncobj_t mutex_syncobj, rw_syncobj; 137 138 int 139 kpause(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 } 158 159 vaddr_t 160 calc_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) 172 173 void 174 assert_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 } 189 190 void 191 module_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 */ 215 static void 216 rump_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 } 255 void (*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. */ 260 261 int rump_getcwd_common(struct vnode *, struct vnode *, char **, char *, 262 int, int, struct lwp *); 263 int 264 rump_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. */ 273 274 void rump_fstrans_start(struct mount *); 275 void 276 rump_fstrans_start(struct mount *mp) 277 { 278 279 } 280 __weak_alias(fstrans_start,rump_fstrans_start); 281 282 int rump_fstrans_start_nowait(struct mount *); 283 int 284 rump_fstrans_start_nowait(struct mount *mp) 285 { 286 287 return 0; 288 } 289 __weak_alias(fstrans_start_nowait,rump_fstrans_start_nowait); 290 291 void rump_fstrans_start_lazy(struct mount *); 292 void 293 rump_fstrans_start_lazy(struct mount *mp) 294 { 295 296 } 297 __weak_alias(fstrans_start_lazy,rump_fstrans_start_lazy); 298 299 300 void rump_fstrans_done(struct mount *); 301 void 302 rump_fstrans_done(struct mount *mp) 303 { 304 305 } 306 __weak_alias(fstrans_done,rump_fstrans_done); 307 308 309 void rump_fstrans_lwp_dtor(struct lwp *); 310 void 311 rump_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 */ 321 322 int rump_ttycheckoutq(struct tty *, int); 323 int 324 rump_ttycheckoutq(struct tty *tp, int wait) 325 { 326 327 return 1; 328 } 329 __weak_alias(ttycheckoutq,rump_ttycheckoutq); 330 331 int rump_tputchar(int, int, struct tty *); 332 int 333 rump_tputchar(int c, int flags, struct tty *tp) 334 { 335 336 cnputc(c); 337 return 0; 338 } 339 __weak_alias(tputchar,rump_tputchar); 340 341 void 342 cnputc(int c) 343 { 344 345 rumpuser_putchar(c); 346 } 347 348 void 349 cnflush(void) 350 { 351 352 /* done */ 353 } 354 355 void 356 resettodr(void) 357 { 358 359 /* setting clocks is not in the jurisdiction of rump kernels */ 360 } 361 362 #ifdef __HAVE_SYSCALL_INTERN 363 void 364 syscall_intern(struct proc *p) 365 { 366 367 p->p_emuldata = NULL; 368 } 369 #endif 370 371 #ifdef LOCKDEBUG 372 void 373 turnstile_print(volatile void *obj, void (*pr)(const char *, ...)) 374 { 375 376 /* nada */ 377 } 378 #endif 379 380 void 381 cpu_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 } 420 421 const char * 422 cpu_getmodel(void) 423 { 424 425 return "rumpcore (virtual)"; 426 } 427