1 /* $NetBSD: emul.c,v 1.184 2017/11/21 08:49:14 ozaki-r 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 1.184 2017/11/21 08:49:14 ozaki-r 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 #ifdef LOCKDEBUG 40 #include <sys/sleepq.h> 41 #endif 42 43 #include <dev/cons.h> 44 45 #include <rump-sys/kern.h> 46 47 #include <rump/rumpuser.h> 48 49 void (*rump_vfs_fini)(void) = (void *)nullop; 50 51 /* 52 * physmem is largely unused (except for nmbcluster calculations), 53 * so pick a default value which suits ZFS. if an application wants 54 * a very small memory footprint, it can still adjust this before 55 * calling rump_init() 56 */ 57 #define PHYSMEM 512*256 58 psize_t physmem = PHYSMEM; 59 int nkmempages = PHYSMEM/2; /* from le chapeau */ 60 #undef PHYSMEM 61 62 struct vnode *rootvp; 63 dev_t rootdev = NODEV; 64 65 const int schedppq = 1; 66 bool mp_online = false; 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 #ifndef __HAVE_MINIMAL_EMUL 122 .e_nsysent = SYS_NSYSENT, 123 #endif 124 .e_vm_default_addr = uvm_default_mapaddr, 125 #ifdef __HAVE_SYSCALL_INTERN 126 .e_syscall_intern = syscall_intern, 127 #endif 128 .e_sc_autoload = netbsd_syscalls_autoload, 129 }; 130 131 cprng_strong_t *kern_cprng; 132 133 /* not used, but need the symbols for pointer comparisons */ 134 syncobj_t mutex_syncobj, rw_syncobj; 135 136 int 137 kpause(const char *wmesg, bool intr, int timeo, kmutex_t *mtx) 138 { 139 extern int hz; 140 int rv __diagused; 141 uint64_t sec, nsec; 142 143 if (mtx) 144 mutex_exit(mtx); 145 146 sec = timeo / hz; 147 nsec = (timeo % hz) * (1000000000 / hz); 148 rv = rumpuser_clock_sleep(RUMPUSER_CLOCK_RELWALL, sec, nsec); 149 KASSERT(rv == 0); 150 151 if (mtx) 152 mutex_enter(mtx); 153 154 return 0; 155 } 156 157 vaddr_t 158 calc_cache_size(vsize_t vasz, int pct, int va_pct) 159 { 160 paddr_t t; 161 162 t = (paddr_t)physmem * pct / 100 * PAGE_SIZE; 163 if ((vaddr_t)t != t) { 164 panic("%s: needs tweak", __func__); 165 } 166 return t; 167 } 168 169 #define RETURN_ADDRESS (uintptr_t)__builtin_return_address(0) 170 171 void 172 assert_sleepable(void) 173 { 174 const char *reason = NULL; 175 176 /* always sleepable, although we should improve this */ 177 178 if (!pserialize_not_in_read_section()) { 179 reason = "pserialize"; 180 } 181 182 if (reason) { 183 panic("%s: %s caller=%p", __func__, reason, 184 (void *)RETURN_ADDRESS); 185 } 186 } 187 188 void 189 module_init_md(void) 190 { 191 192 /* 193 * Nothing for now. However, we should load the librump 194 * symbol table. 195 */ 196 } 197 198 /* 199 * Try to emulate all the MD definitions of DELAY() / delay(). 200 * Would be nice to fix the #defines in MD headers, but this quicker. 201 * 202 * XXX: we'd need a rumpuser_clock_sleep_nowrap() here. Since we 203 * don't have it in the current hypercall revision, busyloop. 204 * Note that rather than calibrate a loop delay and work with that, 205 * get call gettime (which does not block) in a loop to make sure 206 * we didn't get virtual ghosttime. That might be slightly inaccurate 207 * for very small delays ... 208 * 209 * The other option would be to run a thread in the hypervisor which 210 * sleeps for us and we can wait for it using rumpuser_cv_wait_nowrap() 211 * Probably too fussy. Better just wait for hypercall rev 18 ;) 212 */ 213 static void 214 rump_delay(unsigned int us) 215 { 216 struct timespec target, tmp; 217 uint64_t sec, sec_ini, sec_now; 218 long nsec, nsec_ini, nsec_now; 219 int loops; 220 221 rumpuser_clock_gettime(RUMPUSER_CLOCK_ABSMONO, &sec_ini, &nsec_ini); 222 223 #ifdef __mac68k__ 224 sec = us / 1000; 225 nsec = (us % 1000) * 1000000; 226 #else 227 sec = us / 1000000; 228 nsec = (us % 1000000) * 1000; 229 #endif 230 231 target.tv_sec = sec_ini; 232 tmp.tv_sec = sec; 233 target.tv_nsec = nsec_ini; 234 tmp.tv_nsec = nsec; 235 timespecadd(&target, &tmp, &target); 236 237 if (__predict_false(sec != 0)) 238 printf("WARNING: over 1s delay\n"); 239 240 for (loops = 0; loops < 1000*1000*100; loops++) { 241 struct timespec cur; 242 243 rumpuser_clock_gettime(RUMPUSER_CLOCK_ABSMONO, 244 &sec_now, &nsec_now); 245 cur.tv_sec = sec_now; 246 cur.tv_nsec = nsec_now; 247 if (timespeccmp(&cur, &target, >=)) { 248 return; 249 } 250 } 251 printf("WARNING: DELAY ESCAPED\n"); 252 } 253 void (*delay_func)(unsigned int) = rump_delay; 254 __strong_alias(delay,rump_delay); 255 __strong_alias(_delay,rump_delay); 256 257 /* Weak aliases for fstrans to be used unless librumpvfs is present. */ 258 259 void rump_fstrans_start(struct mount *); 260 void 261 rump_fstrans_start(struct mount *mp) 262 { 263 264 } 265 __weak_alias(fstrans_start,rump_fstrans_start); 266 267 int rump_fstrans_start_nowait(struct mount *); 268 int 269 rump_fstrans_start_nowait(struct mount *mp) 270 { 271 272 return 0; 273 } 274 __weak_alias(fstrans_start_nowait,rump_fstrans_start_nowait); 275 276 void rump_fstrans_done(struct mount *); 277 void 278 rump_fstrans_done(struct mount *mp) 279 { 280 281 } 282 __weak_alias(fstrans_done,rump_fstrans_done); 283 284 /* 285 * Provide weak aliases for tty routines used by printf. 286 * They will be used unless the rumpkern_tty component is present. 287 */ 288 289 int rump_ttycheckoutq(struct tty *, int); 290 int 291 rump_ttycheckoutq(struct tty *tp, int wait) 292 { 293 294 return 1; 295 } 296 __weak_alias(ttycheckoutq,rump_ttycheckoutq); 297 298 int rump_tputchar(int, int, struct tty *); 299 int 300 rump_tputchar(int c, int flags, struct tty *tp) 301 { 302 303 cnputc(c); 304 return 0; 305 } 306 __weak_alias(tputchar,rump_tputchar); 307 308 void 309 cnputc(int c) 310 { 311 312 rumpuser_putchar(c); 313 } 314 315 void 316 cnflush(void) 317 { 318 319 /* done */ 320 } 321 322 void 323 resettodr(void) 324 { 325 326 /* setting clocks is not in the jurisdiction of rump kernels */ 327 } 328 329 #ifdef __HAVE_SYSCALL_INTERN 330 void 331 syscall_intern(struct proc *p) 332 { 333 334 p->p_emuldata = NULL; 335 } 336 #endif 337 338 #ifdef LOCKDEBUG 339 void 340 turnstile_print(volatile void *obj, void (*pr)(const char *, ...)) 341 { 342 343 /* nada */ 344 } 345 #endif 346 347 void 348 cpu_reboot(int howto, char *bootstr) 349 { 350 int ruhow = 0; 351 void *finiarg; 352 353 printf("rump kernel halting...\n"); 354 355 if (!RUMP_LOCALPROC_P(curproc)) 356 finiarg = RUMP_SPVM2CTL(curproc->p_vmspace); 357 else 358 finiarg = NULL; 359 360 /* dump means we really take the dive here */ 361 if ((howto & RB_DUMP) || panicstr) { 362 ruhow = RUMPUSER_PANIC; 363 goto out; 364 } 365 366 /* try to sync */ 367 if (!((howto & RB_NOSYNC) || panicstr)) { 368 rump_vfs_fini(); 369 } 370 371 doshutdownhooks(); 372 373 /* your wish is my command */ 374 if (howto & RB_HALT) { 375 printf("rump kernel halted (with RB_HALT, not exiting)\n"); 376 rump_sysproxy_fini(finiarg); 377 for (;;) { 378 rumpuser_clock_sleep(RUMPUSER_CLOCK_RELWALL, 10, 0); 379 } 380 } 381 382 /* this function is __dead, we must exit */ 383 out: 384 rump_sysproxy_fini(finiarg); 385 rumpuser_exit(ruhow); 386 } 387 388 const char * 389 cpu_getmodel(void) 390 { 391 392 return "rumpcore (virtual)"; 393 } 394