| 1 | /* |
| 2 | * Copyright (c) 1995 Terrence R. Lambert |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 |
| 6 | * The Regents of the University of California. All rights reserved. |
| 7 | * (c) UNIX System Laboratories, Inc. |
| 8 | * All or some portions of this file are derived from material licensed |
| 9 | * to the University of California by American Telephone and Telegraph |
| 10 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
| 11 | * the permission of UNIX System Laboratories, Inc. |
| 12 | * |
| 13 | * Redistribution and use in source and binary forms, with or without |
| 14 | * modification, are permitted provided that the following conditions |
| 15 | * are met: |
| 16 | * 1. Redistributions of source code must retain the above copyright |
| 17 | * notice, this list of conditions and the following disclaimer. |
| 18 | * 2. Redistributions in binary form must reproduce the above copyright |
| 19 | * notice, this list of conditions and the following disclaimer in the |
| 20 | * documentation and/or other materials provided with the distribution. |
| 21 | * 3. All advertising materials mentioning features or use of this software |
| 22 | * must display the following acknowledgement: |
| 23 | * This product includes software developed by the University of |
| 24 | * California, Berkeley and its contributors. |
| 25 | * 4. Neither the name of the University nor the names of its contributors |
| 26 | * may be used to endorse or promote products derived from this software |
| 27 | * without specific prior written permission. |
| 28 | * |
| 29 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 30 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 31 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 32 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 33 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 34 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 35 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 36 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 37 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 38 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 39 | * SUCH DAMAGE. |
| 40 | * |
| 41 | * @(#)init_main.c 8.9 (Berkeley) 1/21/94 |
| 42 | * $FreeBSD: src/sys/kern/init_main.c,v 1.134.2.8 2003/06/06 20:21:32 tegge Exp $ |
| 43 | * $DragonFly: src/sys/kern/init_main.c,v 1.87 2008/06/07 11:37:23 mneumann Exp $ |
| 44 | */ |
| 45 | |
| 46 | #include "opt_init_path.h" |
| 47 | |
| 48 | #include <sys/param.h> |
| 49 | #include <sys/file.h> |
| 50 | #include <sys/filedesc.h> |
| 51 | #include <sys/kernel.h> |
| 52 | #include <sys/mount.h> |
| 53 | #include <sys/sysctl.h> |
| 54 | #include <sys/proc.h> |
| 55 | #include <sys/resourcevar.h> |
| 56 | #include <sys/signalvar.h> |
| 57 | #include <sys/systm.h> |
| 58 | #include <sys/vnode.h> |
| 59 | #include <sys/sysent.h> |
| 60 | #include <sys/reboot.h> |
| 61 | #include <sys/sysproto.h> |
| 62 | #include <sys/vmmeter.h> |
| 63 | #include <sys/unistd.h> |
| 64 | #include <sys/malloc.h> |
| 65 | #include <sys/machintr.h> |
| 66 | #include <sys/file2.h> |
| 67 | #include <sys/thread2.h> |
| 68 | #include <sys/sysref2.h> |
| 69 | #include <sys/spinlock2.h> |
| 70 | |
| 71 | #include <machine/cpu.h> |
| 72 | |
| 73 | #include <vm/vm.h> |
| 74 | #include <vm/vm_param.h> |
| 75 | #include <sys/lock.h> |
| 76 | #include <vm/pmap.h> |
| 77 | #include <vm/vm_map.h> |
| 78 | #include <vm/vm_extern.h> |
| 79 | #include <sys/user.h> |
| 80 | #include <sys/copyright.h> |
| 81 | |
| 82 | /* Components of the first process -- never freed. */ |
| 83 | static struct session session0; |
| 84 | static struct pgrp pgrp0; |
| 85 | static struct sigacts sigacts0; |
| 86 | static struct filedesc filedesc0; |
| 87 | static struct plimit limit0; |
| 88 | static struct vmspace vmspace0; |
| 89 | struct proc *initproc; |
| 90 | struct proc proc0; |
| 91 | struct lwp lwp0; |
| 92 | struct thread thread0; |
| 93 | |
| 94 | int cmask = CMASK; |
| 95 | extern struct user *proc0paddr; |
| 96 | extern int fallback_elf_brand; |
| 97 | |
| 98 | int boothowto = 0; /* initialized so that it can be patched */ |
| 99 | SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, ""); |
| 100 | |
| 101 | /* |
| 102 | * This ensures that there is at least one entry so that the sysinit_set |
| 103 | * symbol is not undefined. A subsystem ID of SI_SPECIAL_DUMMY is never |
| 104 | * executed. |
| 105 | */ |
| 106 | SYSINIT(placeholder, SI_SPECIAL_DUMMY, SI_ORDER_ANY, NULL, NULL) |
| 107 | |
| 108 | /* |
| 109 | * The sysinit table itself. Items are checked off as the are run. |
| 110 | * If we want to register new sysinit types, add them to newsysinit. |
| 111 | */ |
| 112 | SET_DECLARE(sysinit_set, struct sysinit); |
| 113 | struct sysinit **sysinit, **sysinit_end; |
| 114 | struct sysinit **newsysinit, **newsysinit_end; |
| 115 | |
| 116 | |
| 117 | /* |
| 118 | * Merge a new sysinit set into the current set, reallocating it if |
| 119 | * necessary. This can only be called after malloc is running. |
| 120 | */ |
| 121 | void |
| 122 | sysinit_add(struct sysinit **set, struct sysinit **set_end) |
| 123 | { |
| 124 | struct sysinit **newset; |
| 125 | struct sysinit **sipp; |
| 126 | struct sysinit **xipp; |
| 127 | int count; |
| 128 | |
| 129 | count = set_end - set; |
| 130 | if (newsysinit) |
| 131 | count += newsysinit_end - newsysinit; |
| 132 | else |
| 133 | count += sysinit_end - sysinit; |
| 134 | newset = kmalloc(count * sizeof(*sipp), M_TEMP, M_WAITOK); |
| 135 | xipp = newset; |
| 136 | if (newsysinit) { |
| 137 | for (sipp = newsysinit; sipp < newsysinit_end; sipp++) |
| 138 | *xipp++ = *sipp; |
| 139 | } else { |
| 140 | for (sipp = sysinit; sipp < sysinit_end; sipp++) |
| 141 | *xipp++ = *sipp; |
| 142 | } |
| 143 | for (sipp = set; sipp < set_end; sipp++) |
| 144 | *xipp++ = *sipp; |
| 145 | if (newsysinit) |
| 146 | kfree(newsysinit, M_TEMP); |
| 147 | newsysinit = newset; |
| 148 | newsysinit_end = newset + count; |
| 149 | } |
| 150 | |
| 151 | /* |
| 152 | * Callbacks from machine-dependant startup code (e.g. init386) to set |
| 153 | * up low level entities related to cpu #0's globaldata. |
| 154 | * |
| 155 | * Called from very low level boot code. |
| 156 | */ |
| 157 | void |
| 158 | mi_proc0init(struct globaldata *gd, struct user *proc0paddr) |
| 159 | { |
| 160 | lwkt_init_thread(&thread0, proc0paddr, LWKT_THREAD_STACK, 0, gd); |
| 161 | lwkt_set_comm(&thread0, "thread0"); |
| 162 | RB_INIT(&proc0.p_lwp_tree); |
| 163 | spin_init(&proc0.p_spin); |
| 164 | proc0.p_lasttid = 0; /* +1 = next TID */ |
| 165 | lwp_rb_tree_RB_INSERT(&proc0.p_lwp_tree, &lwp0); |
| 166 | lwp0.lwp_thread = &thread0; |
| 167 | lwp0.lwp_proc = &proc0; |
| 168 | proc0.p_usched = usched_init(); |
| 169 | lwp0.lwp_cpumask = 0xFFFFFFFF; |
| 170 | varsymset_init(&proc0.p_varsymset, NULL); |
| 171 | thread0.td_flags |= TDF_RUNNING; |
| 172 | thread0.td_proc = &proc0; |
| 173 | thread0.td_lwp = &lwp0; |
| 174 | thread0.td_switch = cpu_heavy_switch; /* YYY eventually LWKT */ |
| 175 | lwkt_schedule_self(curthread); |
| 176 | } |
| 177 | |
| 178 | /* |
| 179 | * System startup; initialize the world, create process 0, mount root |
| 180 | * filesystem, and fork to create init and pagedaemon. Most of the |
| 181 | * hard work is done in the lower-level initialization routines including |
| 182 | * startup(), which does memory initialization and autoconfiguration. |
| 183 | * |
| 184 | * This allows simple addition of new kernel subsystems that require |
| 185 | * boot time initialization. It also allows substitution of subsystem |
| 186 | * (for instance, a scheduler, kernel profiler, or VM system) by object |
| 187 | * module. Finally, it allows for optional "kernel threads". |
| 188 | */ |
| 189 | void |
| 190 | mi_startup(void) |
| 191 | { |
| 192 | struct sysinit *sip; /* system initialization*/ |
| 193 | struct sysinit **sipp; /* system initialization*/ |
| 194 | struct sysinit **xipp; /* interior loop of sort*/ |
| 195 | struct sysinit *save; /* bubble*/ |
| 196 | |
| 197 | //kprintf0("mi_startup\n"); |
| 198 | |
| 199 | if (sysinit == NULL) { |
| 200 | sysinit = SET_BEGIN(sysinit_set); |
| 201 | sysinit_end = SET_LIMIT(sysinit_set); |
| 202 | } |
| 203 | |
| 204 | restart: |
| 205 | /* |
| 206 | * Perform a bubble sort of the system initialization objects by |
| 207 | * their subsystem (primary key) and order (secondary key). |
| 208 | */ |
| 209 | for (sipp = sysinit; sipp < sysinit_end; sipp++) { |
| 210 | for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { |
| 211 | if ((*sipp)->subsystem < (*xipp)->subsystem || |
| 212 | ((*sipp)->subsystem == (*xipp)->subsystem && |
| 213 | (*sipp)->order <= (*xipp)->order)) |
| 214 | continue; /* skip*/ |
| 215 | save = *sipp; |
| 216 | *sipp = *xipp; |
| 217 | *xipp = save; |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | /* |
| 222 | * Traverse the (now) ordered list of system initialization tasks. |
| 223 | * Perform each task, and continue on to the next task. |
| 224 | * |
| 225 | * The last item on the list is expected to be the scheduler, |
| 226 | * which will not return. |
| 227 | */ |
| 228 | for (sipp = sysinit; sipp < sysinit_end; sipp++) { |
| 229 | sip = *sipp; |
| 230 | if (sip->subsystem == SI_SPECIAL_DUMMY) |
| 231 | continue; /* skip dummy task(s)*/ |
| 232 | |
| 233 | if (sip->subsystem == SI_SPECIAL_DONE) |
| 234 | continue; |
| 235 | |
| 236 | //kprintf0("!%s!", sip->name); |
| 237 | |
| 238 | /* Call function */ |
| 239 | (*(sip->func))(sip->udata); |
| 240 | |
| 241 | /* Check off the one we're just done */ |
| 242 | sip->subsystem = SI_SPECIAL_DONE; |
| 243 | |
| 244 | /* Check if we've installed more sysinit items via KLD */ |
| 245 | if (newsysinit != NULL) { |
| 246 | if (sysinit != SET_BEGIN(sysinit_set)) |
| 247 | kfree(sysinit, M_TEMP); |
| 248 | sysinit = newsysinit; |
| 249 | sysinit_end = newsysinit_end; |
| 250 | newsysinit = NULL; |
| 251 | newsysinit_end = NULL; |
| 252 | goto restart; |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | panic("Shouldn't get here!"); |
| 257 | /* NOTREACHED*/ |
| 258 | } |
| 259 | |
| 260 | |
| 261 | /* |
| 262 | *************************************************************************** |
| 263 | **** |
| 264 | **** The following SYSINIT's belong elsewhere, but have not yet |
| 265 | **** been moved. |
| 266 | **** |
| 267 | *************************************************************************** |
| 268 | */ |
| 269 | static void |
| 270 | print_caddr_t(void *data __unused) |
| 271 | { |
| 272 | kprintf("%s", (char *)data); |
| 273 | } |
| 274 | SYSINIT(announce, SI_BOOT1_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, copyright) |
| 275 | |
| 276 | /* |
| 277 | * Leave the critical section that protected us from spurious interrupts |
| 278 | * so device probes work. |
| 279 | */ |
| 280 | static void |
| 281 | leavecrit(void *dummy __unused) |
| 282 | { |
| 283 | MachIntrABI.finalize(); |
| 284 | cpu_enable_intr(); |
| 285 | MachIntrABI.cleanup(); |
| 286 | crit_exit(); |
| 287 | KKASSERT(!IN_CRITICAL_SECT(curthread)); |
| 288 | |
| 289 | if (bootverbose) |
| 290 | kprintf("Leaving critical section, allowing interrupts\n"); |
| 291 | } |
| 292 | SYSINIT(leavecrit, SI_BOOT2_LEAVE_CRIT, SI_ORDER_ANY, leavecrit, NULL) |
| 293 | |
| 294 | /* |
| 295 | * This is called after the threading system is up and running, |
| 296 | * including the softclock, clock interrupts, and SMP. |
| 297 | */ |
| 298 | static void |
| 299 | tsleepworks(void *dummy __unused) |
| 300 | { |
| 301 | tsleep_now_works = 1; |
| 302 | } |
| 303 | SYSINIT(tsleepworks, SI_BOOT2_FINISH_SMP, SI_ORDER_SECOND, tsleepworks, NULL) |
| 304 | |
| 305 | /* |
| 306 | * This is called after devices have configured. Tell the kernel we are |
| 307 | * no longer in cold boot. |
| 308 | */ |
| 309 | static void |
| 310 | endofcoldboot(void *dummy __unused) |
| 311 | { |
| 312 | cold = 0; |
| 313 | } |
| 314 | SYSINIT(endofcoldboot, SI_SUB_ISWARM, SI_ORDER_ANY, endofcoldboot, NULL) |
| 315 | |
| 316 | /* |
| 317 | *************************************************************************** |
| 318 | **** |
| 319 | **** The two following SYSINT's are proc0 specific glue code. I am not |
| 320 | **** convinced that they can not be safely combined, but their order of |
| 321 | **** operation has been maintained as the same as the original init_main.c |
| 322 | **** for right now. |
| 323 | **** |
| 324 | **** These probably belong in init_proc.c or kern_proc.c, since they |
| 325 | **** deal with proc0 (the fork template process). |
| 326 | **** |
| 327 | *************************************************************************** |
| 328 | */ |
| 329 | /* ARGSUSED*/ |
| 330 | static void |
| 331 | proc0_init(void *dummy __unused) |
| 332 | { |
| 333 | struct proc *p; |
| 334 | struct lwp *lp; |
| 335 | |
| 336 | p = &proc0; |
| 337 | lp = &lwp0; |
| 338 | |
| 339 | /* |
| 340 | * Initialize process and pgrp structures. |
| 341 | */ |
| 342 | procinit(); |
| 343 | |
| 344 | /* |
| 345 | * additional VM structures |
| 346 | */ |
| 347 | vm_init2(); |
| 348 | |
| 349 | /* |
| 350 | * Create process 0 (the swapper). |
| 351 | */ |
| 352 | LIST_INSERT_HEAD(&allproc, p, p_list); |
| 353 | p->p_pgrp = &pgrp0; |
| 354 | LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); |
| 355 | LIST_INIT(&pgrp0.pg_members); |
| 356 | LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); |
| 357 | |
| 358 | pgrp0.pg_session = &session0; |
| 359 | session0.s_count = 1; |
| 360 | session0.s_leader = p; |
| 361 | |
| 362 | p->p_sysent = &aout_sysvec; |
| 363 | |
| 364 | p->p_flag = P_SYSTEM; |
| 365 | p->p_stat = SACTIVE; |
| 366 | lp->lwp_stat = LSRUN; |
| 367 | p->p_nice = NZERO; |
| 368 | p->p_rtprio.type = RTP_PRIO_NORMAL; |
| 369 | p->p_rtprio.prio = 0; |
| 370 | lp->lwp_rtprio = p->p_rtprio; |
| 371 | |
| 372 | p->p_peers = 0; |
| 373 | p->p_leader = p; |
| 374 | |
| 375 | bcopy("swapper", p->p_comm, sizeof ("swapper")); |
| 376 | bcopy("swapper", thread0.td_comm, sizeof ("swapper")); |
| 377 | |
| 378 | /* Create credentials. */ |
| 379 | p->p_ucred = crget(); |
| 380 | p->p_ucred->cr_ruidinfo = uifind(0); |
| 381 | p->p_ucred->cr_ngroups = 1; /* group 0 */ |
| 382 | p->p_ucred->cr_uidinfo = uifind(0); |
| 383 | |
| 384 | /* Don't jail it */ |
| 385 | p->p_ucred->cr_prison = NULL; |
| 386 | |
| 387 | /* Create sigacts. */ |
| 388 | p->p_sigacts = &sigacts0; |
| 389 | p->p_sigacts->ps_refcnt = 1; |
| 390 | |
| 391 | /* Initialize signal state for process 0. */ |
| 392 | siginit(p); |
| 393 | |
| 394 | /* Create the file descriptor table. */ |
| 395 | fdinit_bootstrap(p, &filedesc0, cmask); |
| 396 | |
| 397 | /* Create the limits structures. */ |
| 398 | plimit_init0(&limit0); |
| 399 | p->p_limit = &limit0; |
| 400 | |
| 401 | /* Allocate a prototype map so we have something to fork. */ |
| 402 | pmap_pinit0(vmspace_pmap(&vmspace0)); |
| 403 | p->p_vmspace = &vmspace0; |
| 404 | lp->lwp_vmspace = p->p_vmspace; |
| 405 | sysref_init(&vmspace0.vm_sysref, &vmspace_sysref_class); |
| 406 | vm_map_init(&vmspace0.vm_map, |
| 407 | round_page(VM_MIN_USER_ADDRESS), |
| 408 | trunc_page(VM_MAX_USER_ADDRESS), |
| 409 | vmspace_pmap(&vmspace0)); |
| 410 | sysref_activate(&vmspace0.vm_sysref); |
| 411 | |
| 412 | /* |
| 413 | * Charge root for one process. |
| 414 | */ |
| 415 | (void)chgproccnt(p->p_ucred->cr_uidinfo, 1, 0); |
| 416 | vm_init_limits(p); |
| 417 | } |
| 418 | SYSINIT(p0init, SI_BOOT2_PROC0, SI_ORDER_FIRST, proc0_init, NULL) |
| 419 | |
| 420 | static int proc0_post_callback(struct proc *p, void *data __unused); |
| 421 | |
| 422 | /* ARGSUSED*/ |
| 423 | static void |
| 424 | proc0_post(void *dummy __unused) |
| 425 | { |
| 426 | struct timespec ts; |
| 427 | |
| 428 | /* |
| 429 | * Now we can look at the time, having had a chance to verify the |
| 430 | * time from the file system. Pretend that proc0 started now. |
| 431 | */ |
| 432 | allproc_scan(proc0_post_callback, NULL); |
| 433 | |
| 434 | /* |
| 435 | * Give the ``random'' number generator a thump. |
| 436 | * XXX: Does read_random() contain enough bits to be used here ? |
| 437 | */ |
| 438 | nanotime(&ts); |
| 439 | skrandom(ts.tv_sec ^ ts.tv_nsec); |
| 440 | } |
| 441 | |
| 442 | static int |
| 443 | proc0_post_callback(struct proc *p, void *data __unused) |
| 444 | { |
| 445 | microtime(&p->p_start); |
| 446 | return(0); |
| 447 | } |
| 448 | |
| 449 | SYSINIT(p0post, SI_SUB_PROC0_POST, SI_ORDER_FIRST, proc0_post, NULL) |
| 450 | |
| 451 | /* |
| 452 | *************************************************************************** |
| 453 | **** |
| 454 | **** The following SYSINIT's and glue code should be moved to the |
| 455 | **** respective files on a per subsystem basis. |
| 456 | **** |
| 457 | *************************************************************************** |
| 458 | */ |
| 459 | |
| 460 | |
| 461 | /* |
| 462 | *************************************************************************** |
| 463 | **** |
| 464 | **** The following code probably belongs in another file, like |
| 465 | **** kern/init_init.c. |
| 466 | **** |
| 467 | *************************************************************************** |
| 468 | */ |
| 469 | |
| 470 | /* |
| 471 | * List of paths to try when searching for "init". |
| 472 | */ |
| 473 | static char init_path[MAXPATHLEN] = |
| 474 | #ifdef INIT_PATH |
| 475 | __XSTRING(INIT_PATH); |
| 476 | #else |
| 477 | "/sbin/init:/sbin/oinit:/sbin/init.bak"; |
| 478 | #endif |
| 479 | SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, ""); |
| 480 | |
| 481 | /* |
| 482 | * Start the initial user process; try exec'ing each pathname in init_path. |
| 483 | * The program is invoked with one argument containing the boot flags. |
| 484 | * |
| 485 | * The MP lock is held on entry. |
| 486 | */ |
| 487 | static void |
| 488 | start_init(void *dummy, struct trapframe *frame) |
| 489 | { |
| 490 | vm_offset_t addr; |
| 491 | struct execve_args args; |
| 492 | int options, error; |
| 493 | char *var, *path, *next, *s; |
| 494 | char *ucp, **uap, *arg0, *arg1; |
| 495 | struct proc *p; |
| 496 | struct lwp *lp; |
| 497 | struct mount *mp; |
| 498 | struct vnode *vp; |
| 499 | |
| 500 | p = curproc; |
| 501 | |
| 502 | lp = ONLY_LWP_IN_PROC(p); |
| 503 | |
| 504 | /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */ |
| 505 | mp = mountlist_boot_getfirst(); |
| 506 | if (VFS_ROOT(mp, &vp)) |
| 507 | panic("cannot find root vnode"); |
| 508 | if (mp->mnt_ncmountpt.ncp == NULL) { |
| 509 | cache_allocroot(&mp->mnt_ncmountpt, mp, vp); |
| 510 | cache_unlock(&mp->mnt_ncmountpt); /* leave ref intact */ |
| 511 | } |
| 512 | p->p_fd->fd_cdir = vp; |
| 513 | vref(p->p_fd->fd_cdir); |
| 514 | p->p_fd->fd_rdir = vp; |
| 515 | vref(p->p_fd->fd_rdir); |
| 516 | vfs_cache_setroot(vp, cache_hold(&mp->mnt_ncmountpt)); |
| 517 | vn_unlock(vp); /* leave ref intact */ |
| 518 | cache_copy(&mp->mnt_ncmountpt, &p->p_fd->fd_ncdir); |
| 519 | cache_copy(&mp->mnt_ncmountpt, &p->p_fd->fd_nrdir); |
| 520 | |
| 521 | /* |
| 522 | * Need just enough stack to hold the faked-up "execve()" arguments. |
| 523 | */ |
| 524 | addr = trunc_page(USRSTACK - PAGE_SIZE); |
| 525 | error = vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, |
| 526 | FALSE, |
| 527 | VM_MAPTYPE_NORMAL, |
| 528 | VM_PROT_ALL, VM_PROT_ALL, |
| 529 | 0); |
| 530 | if (error) |
| 531 | panic("init: couldn't allocate argument space"); |
| 532 | p->p_vmspace->vm_maxsaddr = (caddr_t)addr; |
| 533 | p->p_vmspace->vm_ssize = 1; |
| 534 | |
| 535 | if ((var = kgetenv("init_path")) != NULL) { |
| 536 | strncpy(init_path, var, sizeof init_path); |
| 537 | init_path[sizeof init_path - 1] = 0; |
| 538 | } |
| 539 | if ((var = kgetenv("kern.fallback_elf_brand")) != NULL) |
| 540 | fallback_elf_brand = strtol(var, NULL, 0); |
| 541 | |
| 542 | for (path = init_path; *path != '\0'; path = next) { |
| 543 | while (*path == ':') |
| 544 | path++; |
| 545 | if (*path == '\0') |
| 546 | break; |
| 547 | for (next = path; *next != '\0' && *next != ':'; next++) |
| 548 | /* nothing */ ; |
| 549 | if (bootverbose) |
| 550 | kprintf("start_init: trying %.*s\n", (int)(next - path), |
| 551 | path); |
| 552 | |
| 553 | /* |
| 554 | * Move out the boot flag argument. |
| 555 | */ |
| 556 | options = 0; |
| 557 | ucp = (char *)USRSTACK; |
| 558 | (void)subyte(--ucp, 0); /* trailing zero */ |
| 559 | if (boothowto & RB_SINGLE) { |
| 560 | (void)subyte(--ucp, 's'); |
| 561 | options = 1; |
| 562 | } |
| 563 | #ifdef notyet |
| 564 | if (boothowto & RB_FASTBOOT) { |
| 565 | (void)subyte(--ucp, 'f'); |
| 566 | options = 1; |
| 567 | } |
| 568 | #endif |
| 569 | |
| 570 | #ifdef BOOTCDROM |
| 571 | (void)subyte(--ucp, 'C'); |
| 572 | options = 1; |
| 573 | #endif |
| 574 | if (options == 0) |
| 575 | (void)subyte(--ucp, '-'); |
| 576 | (void)subyte(--ucp, '-'); /* leading hyphen */ |
| 577 | arg1 = ucp; |
| 578 | |
| 579 | /* |
| 580 | * Move out the file name (also arg 0). |
| 581 | */ |
| 582 | (void)subyte(--ucp, 0); |
| 583 | for (s = next - 1; s >= path; s--) |
| 584 | (void)subyte(--ucp, *s); |
| 585 | arg0 = ucp; |
| 586 | |
| 587 | /* |
| 588 | * Move out the arg pointers. |
| 589 | */ |
| 590 | uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); |
| 591 | (void)suword((caddr_t)--uap, (long)0); /* terminator */ |
| 592 | (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); |
| 593 | (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); |
| 594 | |
| 595 | /* |
| 596 | * Point at the arguments. |
| 597 | */ |
| 598 | args.fname = arg0; |
| 599 | args.argv = uap; |
| 600 | args.envv = NULL; |
| 601 | |
| 602 | /* |
| 603 | * Now try to exec the program. If can't for any reason |
| 604 | * other than it doesn't exist, complain. |
| 605 | * |
| 606 | * Otherwise, return via fork_trampoline() all the way |
| 607 | * to user mode as init! |
| 608 | * |
| 609 | * WARNING! We may have been moved to another cpu after |
| 610 | * acquiring the current user process designation. The |
| 611 | * MP lock will migrate with us though so we still have to |
| 612 | * release it. |
| 613 | */ |
| 614 | if ((error = sys_execve(&args)) == 0) { |
| 615 | rel_mplock(); |
| 616 | lp->lwp_proc->p_usched->acquire_curproc(lp); |
| 617 | return; |
| 618 | } |
| 619 | if (error != ENOENT) |
| 620 | kprintf("exec %.*s: error %d\n", (int)(next - path), |
| 621 | path, error); |
| 622 | } |
| 623 | kprintf("init: not found in path %s\n", init_path); |
| 624 | panic("no init"); |
| 625 | } |
| 626 | |
| 627 | /* |
| 628 | * Like kthread_create(), but runs in it's own address space. |
| 629 | * We do this early to reserve pid 1. |
| 630 | * |
| 631 | * Note special case - do not make it runnable yet. Other work |
| 632 | * in progress will change this more. |
| 633 | */ |
| 634 | static void |
| 635 | create_init(const void *udata __unused) |
| 636 | { |
| 637 | int error; |
| 638 | struct lwp *lp; |
| 639 | |
| 640 | crit_enter(); |
| 641 | error = fork1(&lwp0, RFFDG | RFPROC, &initproc); |
| 642 | if (error) |
| 643 | panic("cannot fork init: %d", error); |
| 644 | initproc->p_flag |= P_SYSTEM; |
| 645 | lp = ONLY_LWP_IN_PROC(initproc); |
| 646 | cpu_set_fork_handler(lp, start_init, NULL); |
| 647 | crit_exit(); |
| 648 | } |
| 649 | SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL) |
| 650 | |
| 651 | /* |
| 652 | * Make it runnable now. |
| 653 | */ |
| 654 | static void |
| 655 | kick_init(const void *udata __unused) |
| 656 | { |
| 657 | start_forked_proc(&lwp0, initproc); |
| 658 | } |
| 659 | SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL) |
| 660 | |
| 661 | /* |
| 662 | * Machine independant globaldata initialization |
| 663 | * |
| 664 | * WARNING! Called from early boot, 'mycpu' may not work yet. |
| 665 | */ |
| 666 | void |
| 667 | mi_gdinit(struct globaldata *gd, int cpuid) |
| 668 | { |
| 669 | TAILQ_INIT(&gd->gd_systimerq); |
| 670 | gd->gd_sysid_alloc = cpuid; /* prime low bits for cpu lookup */ |
| 671 | gd->gd_cpuid = cpuid; |
| 672 | gd->gd_cpumask = (cpumask_t)1 << cpuid; |
| 673 | lwkt_gdinit(gd); |
| 674 | vm_map_entry_reserve_cpu_init(gd); |
| 675 | sleep_gdinit(gd); |
| 676 | } |
| 677 | |