1 /* $NetBSD: emul.c,v 1.193 2019/12/16 22:47:55 ad 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 1.193 2019/12/16 22:47:55 ad 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 struct timespec boottime; 68 int cold = 1; 69 int boothowto = AB_SILENT; 70 struct tty *constty; 71 72 const struct bdevsw *bdevsw0[255]; 73 const struct bdevsw **bdevsw = bdevsw0; 74 const int sys_cdevsws = 255; 75 int max_cdevsws = 255; 76 77 const struct cdevsw *cdevsw0[255]; 78 const struct cdevsw **cdevsw = cdevsw0; 79 const int sys_bdevsws = 255; 80 int max_bdevsws = 255; 81 82 int mem_no = 2; 83 84 device_t booted_device; 85 device_t booted_wedge; 86 int booted_partition; 87 const char *booted_method; 88 89 /* XXX: unused */ 90 kmutex_t tty_lock; 91 krwlock_t exec_lock; 92 93 /* sparc doesn't sport constant page size, pretend we have 4k pages */ 94 #ifdef __sparc__ 95 int nbpg = 4096; 96 int pgofset = 4096-1; 97 int pgshift = 12; 98 #endif 99 100 /* on sun3 VM_MAX_ADDRESS is a const variable */ 101 /* XXX: should be moved into rump.c and initialize for sun3 and sun3x? */ 102 #ifdef sun3 103 const vaddr_t kernbase = KERNBASE3; 104 #endif 105 106 struct loadavg averunnable = { 107 { 0 * FSCALE, 108 1 * FSCALE, 109 11 * FSCALE, }, 110 FSCALE, 111 }; 112 113 /* 114 * Include the autogenerated list of auto-loadable syscalls 115 */ 116 #include <kern/syscalls_autoload.c> 117 118 struct emul emul_netbsd = { 119 .e_name = "netbsd-rump", 120 .e_sysent = rump_sysent, 121 .e_nomodbits = rump_sysent_nomodbits, 122 #ifndef __HAVE_MINIMAL_EMUL 123 .e_nsysent = SYS_NSYSENT, 124 #endif 125 .e_vm_default_addr = uvm_default_mapaddr, 126 #ifdef __HAVE_SYSCALL_INTERN 127 .e_syscall_intern = syscall_intern, 128 #endif 129 .e_sc_autoload = netbsd_syscalls_autoload, 130 }; 131 132 cprng_strong_t *kern_cprng; 133 134 /* not used, but need the symbols for pointer comparisons */ 135 syncobj_t mutex_syncobj, rw_syncobj; 136 137 int 138 kpause(const char *wmesg, bool intr, int timeo, kmutex_t *mtx) 139 { 140 extern int hz; 141 int rv __diagused; 142 uint64_t sec, nsec; 143 144 if (mtx) 145 mutex_exit(mtx); 146 147 sec = timeo / hz; 148 nsec = (timeo % hz) * (1000000000 / hz); 149 rv = rumpuser_clock_sleep(RUMPUSER_CLOCK_RELWALL, sec, nsec); 150 KASSERT(rv == 0); 151 152 if (mtx) 153 mutex_enter(mtx); 154 155 return 0; 156 } 157 158 vaddr_t 159 calc_cache_size(vsize_t vasz, int pct, int va_pct) 160 { 161 paddr_t t; 162 163 t = (paddr_t)physmem * pct / 100 * PAGE_SIZE; 164 if ((vaddr_t)t != t) { 165 panic("%s: needs tweak", __func__); 166 } 167 return t; 168 } 169 170 #define RETURN_ADDRESS (uintptr_t)__builtin_return_address(0) 171 172 void 173 assert_sleepable(void) 174 { 175 const char *reason = NULL; 176 177 /* always sleepable, although we should improve this */ 178 179 if (!pserialize_not_in_read_section()) { 180 reason = "pserialize"; 181 } 182 183 if (reason) { 184 panic("%s: %s caller=%p", __func__, reason, 185 (void *)RETURN_ADDRESS); 186 } 187 } 188 189 void 190 module_init_md(void) 191 { 192 193 /* 194 * Nothing for now. However, we should load the librump 195 * symbol table. 196 */ 197 } 198 199 /* 200 * Try to emulate all the MD definitions of DELAY() / delay(). 201 * Would be nice to fix the #defines in MD headers, but this quicker. 202 * 203 * XXX: we'd need a rumpuser_clock_sleep_nowrap() here. Since we 204 * don't have it in the current hypercall revision, busyloop. 205 * Note that rather than calibrate a loop delay and work with that, 206 * get call gettime (which does not block) in a loop to make sure 207 * we didn't get virtual ghosttime. That might be slightly inaccurate 208 * for very small delays ... 209 * 210 * The other option would be to run a thread in the hypervisor which 211 * sleeps for us and we can wait for it using rumpuser_cv_wait_nowrap() 212 * Probably too fussy. Better just wait for hypercall rev 18 ;) 213 */ 214 static void 215 rump_delay(unsigned int us) 216 { 217 struct timespec target, tmp; 218 uint64_t sec, sec_ini, sec_now; 219 long nsec, nsec_ini, nsec_now; 220 int loops; 221 222 rumpuser_clock_gettime(RUMPUSER_CLOCK_ABSMONO, &sec_ini, &nsec_ini); 223 224 #ifdef __mac68k__ 225 sec = us / 1000; 226 nsec = (us % 1000) * 1000000; 227 #else 228 sec = us / 1000000; 229 nsec = (us % 1000000) * 1000; 230 #endif 231 232 target.tv_sec = sec_ini; 233 tmp.tv_sec = sec; 234 target.tv_nsec = nsec_ini; 235 tmp.tv_nsec = nsec; 236 timespecadd(&target, &tmp, &target); 237 238 if (__predict_false(sec != 0)) 239 printf("WARNING: over 1s delay\n"); 240 241 for (loops = 0; loops < 1000*1000*100; loops++) { 242 struct timespec cur; 243 244 rumpuser_clock_gettime(RUMPUSER_CLOCK_ABSMONO, 245 &sec_now, &nsec_now); 246 cur.tv_sec = sec_now; 247 cur.tv_nsec = nsec_now; 248 if (timespeccmp(&cur, &target, >=)) { 249 return; 250 } 251 } 252 printf("WARNING: DELAY ESCAPED\n"); 253 } 254 void (*delay_func)(unsigned int) = rump_delay; 255 __strong_alias(delay,rump_delay); 256 __strong_alias(_delay,rump_delay); 257 258 /* Weak alias for getcwd_common to be used unless librumpvfs is present. */ 259 260 int rump_getcwd_common(struct vnode *, struct vnode *, char **, char *, 261 int, int, struct lwp *); 262 int 263 rump_getcwd_common(struct vnode *lvp, struct vnode *rvp, char **bpp, char *bufp, 264 int limit, int flags, struct lwp *l) 265 { 266 267 return ENOENT; 268 } 269 __weak_alias(getcwd_common,rump_getcwd_common); 270 271 /* Weak alias for vnode_to_path to be used unless librumpvfs is present. */ 272 273 int rump_vnode_to_path(char *, size_t, struct vnode *, struct lwp *, 274 struct proc *); 275 int 276 rump_vnode_to_path(char *path, size_t len, struct vnode *vp, struct lwp *curl, 277 struct proc *p) 278 { 279 280 return ENOENT; /* pretend getcwd_common() failed. */ 281 } 282 __weak_alias(vnode_to_path,rump_vnode_to_path); 283 284 285 /* Weak aliases for fstrans to be used unless librumpvfs is present. */ 286 287 void rump_fstrans_start(struct mount *); 288 void 289 rump_fstrans_start(struct mount *mp) 290 { 291 292 } 293 __weak_alias(fstrans_start,rump_fstrans_start); 294 295 int rump_fstrans_start_nowait(struct mount *); 296 int 297 rump_fstrans_start_nowait(struct mount *mp) 298 { 299 300 return 0; 301 } 302 __weak_alias(fstrans_start_nowait,rump_fstrans_start_nowait); 303 304 void rump_fstrans_start_lazy(struct mount *); 305 void 306 rump_fstrans_start_lazy(struct mount *mp) 307 { 308 309 } 310 __weak_alias(fstrans_start_lazy,rump_fstrans_start_lazy); 311 312 313 void rump_fstrans_done(struct mount *); 314 void 315 rump_fstrans_done(struct mount *mp) 316 { 317 318 } 319 __weak_alias(fstrans_done,rump_fstrans_done); 320 321 322 void rump_fstrans_lwp_dtor(struct lwp *); 323 void 324 rump_fstrans_lwp_dtor(struct lwp *l) 325 { 326 327 } 328 __weak_alias(fstrans_lwp_dtor,rump_fstrans_lwp_dtor); 329 330 /* 331 * Provide weak aliases for tty routines used by printf. 332 * They will be used unless the rumpkern_tty component is present. 333 */ 334 335 int rump_ttycheckoutq(struct tty *, int); 336 int 337 rump_ttycheckoutq(struct tty *tp, int wait) 338 { 339 340 return 1; 341 } 342 __weak_alias(ttycheckoutq,rump_ttycheckoutq); 343 344 int rump_tputchar(int, int, struct tty *); 345 int 346 rump_tputchar(int c, int flags, struct tty *tp) 347 { 348 349 cnputc(c); 350 return 0; 351 } 352 __weak_alias(tputchar,rump_tputchar); 353 354 void 355 cnputc(int c) 356 { 357 358 rumpuser_putchar(c); 359 } 360 361 void 362 cnflush(void) 363 { 364 365 /* done */ 366 } 367 368 void 369 resettodr(void) 370 { 371 372 /* setting clocks is not in the jurisdiction of rump kernels */ 373 } 374 375 #ifdef __HAVE_SYSCALL_INTERN 376 void 377 syscall_intern(struct proc *p) 378 { 379 380 p->p_emuldata = NULL; 381 } 382 #endif 383 384 #ifdef LOCKDEBUG 385 void 386 turnstile_print(volatile void *obj, void (*pr)(const char *, ...)) 387 { 388 389 /* nada */ 390 } 391 #endif 392 393 void 394 cpu_reboot(int howto, char *bootstr) 395 { 396 int ruhow = 0; 397 void *finiarg; 398 399 printf("rump kernel halting...\n"); 400 401 if (!RUMP_LOCALPROC_P(curproc)) 402 finiarg = RUMP_SPVM2CTL(curproc->p_vmspace); 403 else 404 finiarg = NULL; 405 406 /* dump means we really take the dive here */ 407 if ((howto & RB_DUMP) || panicstr) { 408 ruhow = RUMPUSER_PANIC; 409 goto out; 410 } 411 412 /* try to sync */ 413 if (!((howto & RB_NOSYNC) || panicstr)) { 414 rump_vfs_fini(); 415 } 416 417 doshutdownhooks(); 418 419 /* your wish is my command */ 420 if (howto & RB_HALT) { 421 printf("rump kernel halted (with RB_HALT, not exiting)\n"); 422 rump_sysproxy_fini(finiarg); 423 for (;;) { 424 rumpuser_clock_sleep(RUMPUSER_CLOCK_RELWALL, 10, 0); 425 } 426 } 427 428 /* this function is __dead, we must exit */ 429 out: 430 rump_sysproxy_fini(finiarg); 431 rumpuser_exit(ruhow); 432 } 433