init_main.c revision 31396
1139749Simp/* 2123474Swpaul * Copyright (c) 1995 Terrence R. Lambert 3123474Swpaul * All rights reserved. 4123474Swpaul * 5123474Swpaul * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 6123474Swpaul * The Regents of the University of California. All rights reserved. 7123474Swpaul * (c) UNIX System Laboratories, Inc. 8123474Swpaul * All or some portions of this file are derived from material licensed 9123474Swpaul * to the University of California by American Telephone and Telegraph 10123474Swpaul * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11123474Swpaul * the permission of UNIX System Laboratories, Inc. 12123474Swpaul * 13123474Swpaul * Redistribution and use in source and binary forms, with or without 14123474Swpaul * modification, are permitted provided that the following conditions 15123474Swpaul * are met: 16123474Swpaul * 1. Redistributions of source code must retain the above copyright 17123474Swpaul * notice, this list of conditions and the following disclaimer. 18123474Swpaul * 2. Redistributions in binary form must reproduce the above copyright 19123474Swpaul * notice, this list of conditions and the following disclaimer in the 20123474Swpaul * documentation and/or other materials provided with the distribution. 21123474Swpaul * 3. All advertising materials mentioning features or use of this software 22123474Swpaul * must display the following acknowledgement: 23123474Swpaul * This product includes software developed by the University of 24123474Swpaul * California, Berkeley and its contributors. 25123474Swpaul * 4. Neither the name of the University nor the names of its contributors 26123474Swpaul * may be used to endorse or promote products derived from this software 27123474Swpaul * without specific prior written permission. 28123474Swpaul * 29123474Swpaul * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30123474Swpaul * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31123474Swpaul * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32123474Swpaul * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33123474Swpaul * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34123474Swpaul * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35128229Swpaul * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36128229Swpaul * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37128229Swpaul * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38151207Swpaul * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39151207Swpaul * SUCH DAMAGE. 40151207Swpaul * 41151207Swpaul * @(#)init_main.c 8.9 (Berkeley) 1/21/94 42151207Swpaul * $Id: init_main.c,v 1.74 1997/11/07 08:52:53 phk Exp $ 43151207Swpaul */ 44151207Swpaul 45151207Swpaul#include "opt_devfs.h" 46151207Swpaul 47151207Swpaul#include <sys/param.h> 48126706Swpaul#include <sys/file.h> 49123474Swpaul#include <sys/filedesc.h> 50123474Swpaul#include <sys/kernel.h> 51123620Swpaul#include <sys/mount.h> 52123474Swpaul#include <sys/sysctl.h> 53123474Swpaul#include <sys/proc.h> 54123474Swpaul#include <sys/resourcevar.h> 55126706Swpaul#include <sys/signalvar.h> 56126706Swpaul#include <sys/systm.h> 57126706Swpaul#include <sys/vnode.h> 58126706Swpaul#include <sys/sysent.h> 59126706Swpaul#include <sys/reboot.h> 60126706Swpaul#include <sys/sysproto.h> 61186507Sweongyo#include <sys/vmmeter.h> 62186507Sweongyo 63186507Sweongyo#include <machine/cpu.h> 64186507Sweongyo 65186507Sweongyo#include <vm/vm.h> 66186507Sweongyo#include <vm/vm_param.h> 67123474Swpaul#include <vm/vm_prot.h> 68151207Swpaul#include <sys/lock.h> 69123474Swpaul#include <vm/pmap.h> 70123474Swpaul#include <vm/vm_map.h> 71123474Swpaul#include <sys/user.h> 72145895Swpaul#include <sys/copyright.h> 73123474Swpaul 74123474Swpaulextern struct linker_set sysinit_set; /* XXX */ 75123474Swpaul 76123474Swpaulextern void __main __P((void)); 77151207Swpaulextern void main __P((void *framep)); 78123474Swpaul 79123474Swpaul/* Components of the first process -- never freed. */ 80123474Swpaulstatic struct session session0; 81151207Swpaulstatic struct pgrp pgrp0; 82151207Swpaulstruct proc proc0; 83151207Swpaulstatic struct pcred cred0; 84151207Swpaulstatic struct filedesc0 filedesc0; 85151207Swpaulstatic struct plimit limit0; 86151207Swpaulstatic struct vmspace vmspace0; 87151207Swpaul#ifndef SMP /* per-cpu on smp */ 88151207Swpaulstruct proc *curproc = &proc0; 89151207Swpaul#endif 90123474Swpaulstruct proc *initproc; 91123474Swpaul 92151207Swpaulint cmask = CMASK; 93131750Swpaulextern struct user *proc0paddr; 94151451Swpaul 95123474Swpaulstruct vnode *rootvp; 96183587Sweongyoint boothowto = 0; /* initialized so that it can be patched */ 97123474Swpaul 98151207Swpaulstruct timeval boottime; 99151207SwpaulSYSCTL_STRUCT(_kern, KERN_BOOTTIME, boottime, 100151207Swpaul CTLFLAG_RD, &boottime, timeval, ""); 101151207Swpaul 102151207Swpaulstatic int shutdowntimeout = 120; 103151207SwpaulSYSCTL_INT(_kern, OID_AUTO, shutdown_timeout, 104151207Swpaul CTLFLAG_RW, &shutdowntimeout, 0, ""); 105151207Swpaul 106151207Swpaul#ifndef SMP /* per-cpu on smp */ 107151207Swpaulstruct timeval runtime; 108178354Ssam#endif 109178354Ssam 110178354Ssam/* 111178354Ssam * Promiscuous argument pass for start_init() 112178354Ssam * 113178354Ssam * This is a kludge because we use a return from main() rather than a call 114178354Ssam * to a new routine in locore.s to kick the kernel alive from locore.s. 115178354Ssam */ 116189488Sweongyostatic void *init_framep; 117186507Sweongyo 118189488Sweongyo 119189488Sweongyo#if __GNUC__ >= 2 120186507Sweongyovoid __main() {} 121186507Sweongyo#endif 122189488Sweongyo 123189488Sweongyo 124192984Sthompsa/* 125189488Sweongyo * This ensures that there is at least one entry so that the sysinit_set 126189488Sweongyo * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 127189488Sweongyo * executed. 128189488Sweongyo */ 129189488SweongyoSYSINIT(placeholder, SI_SUB_DUMMY,SI_ORDER_ANY, NULL, NULL) 130186507Sweongyo 131189488Sweongyo 132189488Sweongyo/* 133189488Sweongyo * System startup; initialize the world, create process 0, mount root 134189488Sweongyo * filesystem, and fork to create init and pagedaemon. Most of the 135189488Sweongyo * hard work is done in the lower-level initialization routines including 136189488Sweongyo * startup(), which does memory initialization and autoconfiguration. 137189488Sweongyo * 138186507Sweongyo * This allows simple addition of new kernel subsystems that require 139189488Sweongyo * boot time initialization. It also allows substitution of subsystem 140189488Sweongyo * (for instance, a scheduler, kernel profiler, or VM system) by object 141193045Sthompsa * module. Finally, it allows for optional "kernel threads", like an LFS 142189488Sweongyo * cleaner. 143189488Sweongyo */ 144186507Sweongyovoid 145189719Sweongyomain(framep) 146189719Sweongyo void *framep; 147189719Sweongyo{ 148189719Sweongyo 149189950Sweongyo register struct sysinit **sipp; /* system initialization*/ 150189719Sweongyo register struct sysinit **xipp; /* interior loop of sort*/ 151189719Sweongyo register struct sysinit *save; /* bubble*/ 152189719Sweongyo 153189719Sweongyo /* 154123474Swpaul * Copy the locore.s frame pointer for proc0, this is forked into 155147256Sbrooks * all other processes. 156123474Swpaul */ 157124821Swpaul init_framep = framep; 158124821Swpaul 159124821Swpaul#ifdef SMP 160123474Swpaul /* 161123474Swpaul * XXX curproc is per-cpu in SMP, and exists in freshly mapped pages, 162123474Swpaul * so its value must be initialized now before it is used by various 163123474Swpaul * initialization routines. proc0_init() isn't soon enough: 164123474Swpaul * among other things, configure() is called first, and may call 165123474Swpaul * setdumpdev(), which panics without a valid curproc. 166123474Swpaul */ 167123474Swpaul curproc = &proc0; 168123474Swpaul#endif /* SMP */ 169123474Swpaul 170123474Swpaul /* 171123474Swpaul * Perform a bubble sort of the system initialization objects by 172131953Swpaul * their subsystem (primary key) and order (secondary key). 173123474Swpaul * 174131953Swpaul * Since some things care about execution order, this is the 175123474Swpaul * operation which ensures continued function. 176179723Scokane */ 177151207Swpaul for( sipp = (struct sysinit **)sysinit_set.ls_items; *sipp; sipp++) { 178123474Swpaul for( xipp = sipp + 1; *xipp; xipp++) { 179123474Swpaul if( (*sipp)->subsystem < (*xipp)->subsystem || 180141524Swpaul ( (*sipp)->subsystem == (*xipp)->subsystem && 181141524Swpaul (*sipp)->order < (*xipp)->order)) 182123474Swpaul continue; /* skip*/ 183191746Sthompsa save = *sipp; 184178286Scokane *sipp = *xipp; 185123474Swpaul *xipp = save; 186123474Swpaul } 187123474Swpaul } 188123474Swpaul 189123474Swpaul /* 190123474Swpaul * Traverse the (now) ordered list of system initialization tasks. 191141963Swpaul * Perform each task, and continue on to the next task. 192123474Swpaul * 193123474Swpaul * The last item on the list is expected to be the scheduler, 194123474Swpaul * which will not return. 195123695Swpaul */ 196123695Swpaul for( sipp = (struct sysinit **)sysinit_set.ls_items; *sipp; sipp++) { 197151207Swpaul if( (*sipp)->subsystem == SI_SUB_DUMMY) 198123695Swpaul continue; /* skip dummy task(s)*/ 199123695Swpaul 200125076Swpaul switch( (*sipp)->type) { 201123474Swpaul case SI_TYPE_DEFAULT: 202123620Swpaul /* no special processing*/ 203123474Swpaul (*((*sipp)->func))( (*sipp)->udata); 204145485Swpaul break; 205151207Swpaul 206151207Swpaul case SI_TYPE_KTHREAD: 207151207Swpaul /* kernel thread*/ 208151451Swpaul if (fork(&proc0, NULL)) 209146230Swpaul panic("fork kernel process"); 210123474Swpaul cpu_set_fork_handler(pfind(proc0.p_retval[0]), 211151207Swpaul (*sipp)->func, (*sipp)->udata); 212123474Swpaul break; 213123474Swpaul 214123474Swpaul default: 215123474Swpaul panic( "init_main: unrecognized init type"); 216123474Swpaul } 217151207Swpaul } 218151207Swpaul 219151207Swpaul panic("Shouldn't get here!"); 220151451Swpaul /* NOTREACHED*/ 221151451Swpaul} 222171390Sthompsa 223171390Sthompsa 224171390Sthompsa/* 225179498Scokane * Start a kernel process. This is called after a fork() call in 226179498Scokane * main() in the file kern/init_main.c. 227186507Sweongyo * 228192984Sthompsa * This function is used to start "internal" daemons. 229189719Sweongyo */ 230189950Sweongyo/* ARGSUSED*/ 231189950Sweongyovoid 232189488Sweongyokproc_start(udata) 233189488Sweongyo void *udata; 234189488Sweongyo{ 235189488Sweongyo struct kproc_desc *kp = udata; 236189488Sweongyo struct proc *p = curproc; 237189488Sweongyo 238189488Sweongyo#ifdef DIAGNOSTIC 239189719Sweongyo printf("Start pid=%d <%s>\n",p->p_pid, kp->arg0); 240189719Sweongyo#endif 241189719Sweongyo 242186507Sweongyo /* save a global descriptor, if desired*/ 243186507Sweongyo if( kp->global_procpp != NULL) 244189950Sweongyo *kp->global_procpp = p; 245123474Swpaul 246123474Swpaul /* this is a non-swapped system process*/ 247189488Sweongyo p->p_flag |= P_INMEM | P_SYSTEM; 248189488Sweongyo 249189488Sweongyo /* set up arg0 for 'ps', et al*/ 250189719Sweongyo strcpy( p->p_comm, kp->arg0); 251189719Sweongyo 252189719Sweongyo /* call the processes' main()...*/ 253189719Sweongyo (*kp->func)(); 254 255 /* NOTREACHED */ 256 panic("kproc_start: %s", kp->arg0); 257} 258 259 260/* 261 *************************************************************************** 262 **** 263 **** The following SYSINIT's belong elsewhere, but have not yet 264 **** been moved. 265 **** 266 *************************************************************************** 267 */ 268#ifdef OMIT 269/* 270 * Handled by vfs_mountroot (bad idea) at this time... should be 271 * done the same as 4.4Lite2. 272 */ 273SYSINIT(swapinit, SI_SUB_SWAP, SI_ORDER_FIRST, swapinit, NULL) 274#endif /* OMIT*/ 275 276static void print_caddr_t __P((void *data)); 277static void 278print_caddr_t(data) 279 void *data; 280{ 281 printf("%s", (char *)data); 282} 283SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, copyright) 284 285 286/* 287 *************************************************************************** 288 **** 289 **** The two following SYSINT's are proc0 specific glue code. I am not 290 **** convinced that they can not be safely combined, but their order of 291 **** operation has been maintained as the same as the original init_main.c 292 **** for right now. 293 **** 294 **** These probably belong in init_proc.c or kern_proc.c, since they 295 **** deal with proc0 (the fork template process). 296 **** 297 *************************************************************************** 298 */ 299/* ARGSUSED*/ 300static void proc0_init __P((void *dummy)); 301static void 302proc0_init(dummy) 303 void *dummy; 304{ 305 register struct proc *p; 306 register struct filedesc0 *fdp; 307 register unsigned i; 308 309 /* 310 * Initialize the current process pointer (curproc) before 311 * any possible traps/probes to simplify trap processing. 312 */ 313 p = &proc0; 314 curproc = p; /* XXX redundant*/ 315 316 /* 317 * Initialize process and pgrp structures. 318 */ 319 procinit(); 320 321 /* 322 * Initialize sleep queue hash table 323 */ 324 sleepinit(); 325 326 /* 327 * additional VM structures 328 */ 329 vm_init2(); 330 331 /* 332 * Create process 0 (the swapper). 333 */ 334 LIST_INSERT_HEAD(&allproc, p, p_list); 335 p->p_pgrp = &pgrp0; 336 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 337 LIST_INIT(&pgrp0.pg_members); 338 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 339 340 pgrp0.pg_session = &session0; 341 session0.s_count = 1; 342 session0.s_leader = p; 343 344 p->p_sysent = &aout_sysvec; 345 346 p->p_flag = P_INMEM | P_SYSTEM; 347 p->p_stat = SRUN; 348 p->p_nice = NZERO; 349 p->p_rtprio.type = RTP_PRIO_NORMAL; 350 p->p_rtprio.prio = 0; 351 352/* 353 * Link for kernel based threads 354 */ 355 p->p_peers = 0; 356 p->p_leader = p; 357 358 bcopy("swapper", p->p_comm, sizeof ("swapper")); 359 360 /* Create credentials. */ 361 cred0.p_refcnt = 1; 362 p->p_cred = &cred0; 363 p->p_ucred = crget(); 364 p->p_ucred->cr_ngroups = 1; /* group 0 */ 365 366 /* Create the file descriptor table. */ 367 fdp = &filedesc0; 368 p->p_fd = &fdp->fd_fd; 369 fdp->fd_fd.fd_refcnt = 1; 370 fdp->fd_fd.fd_cmask = cmask; 371 fdp->fd_fd.fd_ofiles = fdp->fd_dfiles; 372 fdp->fd_fd.fd_ofileflags = fdp->fd_dfileflags; 373 fdp->fd_fd.fd_nfiles = NDFILE; 374 375 /* Create the limits structures. */ 376 p->p_limit = &limit0; 377 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 378 limit0.pl_rlimit[i].rlim_cur = 379 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 380 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = 381 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 382 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = 383 limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 384 i = ptoa(cnt.v_free_count); 385 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 386 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 387 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 388 limit0.p_refcnt = 1; 389 390 /* Allocate a prototype map so we have something to fork. */ 391 p->p_vmspace = &vmspace0; 392 vmspace0.vm_refcnt = 1; 393 pmap_pinit(&vmspace0.vm_pmap); 394 vm_map_init(&vmspace0.vm_map, round_page(VM_MIN_ADDRESS), 395 trunc_page(VM_MAXUSER_ADDRESS), TRUE); 396 vmspace0.vm_map.pmap = &vmspace0.vm_pmap; 397 p->p_addr = proc0paddr; /* XXX */ 398 399#define INCOMPAT_LITES2 400#ifdef INCOMPAT_LITES2 401 /* 402 * proc0 needs to have a coherent frame base in it's stack. 403 */ 404 cpu_set_init_frame(p, init_framep); /* XXX! */ 405#endif /* INCOMPAT_LITES2*/ 406 407 /* 408 * We continue to place resource usage info and signal 409 * actions in the user struct so they're pageable. 410 */ 411 p->p_stats = &p->p_addr->u_stats; 412 p->p_sigacts = &p->p_addr->u_sigacts; 413 414 /* 415 * Charge root for one process. 416 */ 417 (void)chgproccnt(0, 1); 418} 419SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL) 420 421/* ARGSUSED*/ 422static void proc0_post __P((void *dummy)); 423static void 424proc0_post(dummy) 425 void *dummy; 426{ 427 struct timeval tv; 428 429 /* 430 * Now can look at time, having had a chance to verify the time 431 * from the file system. Reset p->p_rtime as it may have been 432 * munched in mi_switch() after the time got set. 433 */ 434 gettime(&boottime); 435 proc0.p_stats->p_start = runtime = mono_time = boottime; 436 proc0.p_rtime.tv_sec = proc0.p_rtime.tv_usec = 0; 437 438 /* 439 * Give the ``random'' number generator a thump. 440 */ 441 microtime(&tv); 442 srandom(tv.tv_sec ^ tv.tv_usec); 443 444 /* Initialize signal state for process 0. */ 445 siginit(&proc0); 446} 447SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL) 448 449 450 451 452/* 453 *************************************************************************** 454 **** 455 **** The following SYSINIT's and glue code should be moved to the 456 **** respective files on a per subsystem basis. 457 **** 458 *************************************************************************** 459 */ 460/* ARGSUSED */ 461static void sched_setup __P((void *dummy)); 462static void 463sched_setup(dummy) 464 void *dummy; 465{ 466 /* Kick off timeout driven events by calling first time. */ 467 roundrobin(NULL); 468 schedcpu(NULL); 469} 470SYSINIT(sched_setup, SI_SUB_KICK_SCHEDULER, SI_ORDER_FIRST, sched_setup, NULL) 471 472/* ARGSUSED */ 473static void root_conf __P((void *dummy)); 474static void 475root_conf(dummy) 476 void *dummy; 477{ 478 cpu_rootconf(); 479} 480SYSINIT(root_conf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, root_conf, NULL) 481 482/* ARGSUSED */ 483static void dump_conf __P((void *dummy)); 484static void 485dump_conf(dummy) 486 void *dummy; 487{ 488 cpu_dumpconf(); 489} 490SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 491 492/* ARGSUSED*/ 493static void xxx_vfs_mountroot __P((void *fsnamep)); 494#ifdef BOOTP 495extern void bootpc_init __P((void)); 496#endif 497static void 498xxx_vfs_mountroot(fsnamep) 499 void *fsnamep; 500{ 501 /* XXX Add a separate SYSINIT entry */ 502#ifdef BOOTP 503 bootpc_init(); 504#endif 505 /* Mount the root file system. */ 506 if (vfs_mountrootfs(*((char **) fsnamep))) 507 panic("cannot mount root"); 508} 509SYSINIT(mountroot, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, xxx_vfs_mountroot, 510 &mountrootfsname) 511 512/* ARGSUSED*/ 513static void xxx_vfs_root_fdtab __P((void *dummy)); 514static void 515xxx_vfs_root_fdtab(dummy) 516 void *dummy; 517{ 518 register struct filedesc0 *fdp = &filedesc0; 519 520 /* Get the vnode for '/'. Set fdp->fd_fd.fd_cdir to reference it. */ 521 if (VFS_ROOT(mountlist.cqh_first, &rootvnode)) 522 panic("cannot find root vnode"); 523 fdp->fd_fd.fd_cdir = rootvnode; 524 VREF(fdp->fd_fd.fd_cdir); 525 VOP_UNLOCK(rootvnode, 0, &proc0); 526 fdp->fd_fd.fd_rdir = NULL; 527} 528SYSINIT(retrofit, SI_SUB_ROOT_FDTAB, SI_ORDER_FIRST, xxx_vfs_root_fdtab, NULL) 529 530 531/* 532 *************************************************************************** 533 **** 534 **** The following code probably belongs in another file, like 535 **** kern/init_init.c. It is here for two reasons only: 536 **** 537 **** 1) This code returns to startup the system; this is 538 **** abnormal for a kernel thread. 539 **** 2) This code promiscuously uses init_frame 540 **** 541 *************************************************************************** 542 */ 543 544static void kthread_init __P((void *dummy)); 545SYSINIT_KT(init,SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kthread_init, NULL) 546 547 548extern void prepare_usermode __P((void)); 549static void start_init __P((struct proc *p)); 550 551/* ARGSUSED*/ 552static void 553kthread_init(dummy) 554 void *dummy; 555{ 556 /* Create process 1 (init(8)). */ 557 start_init(curproc); 558 559 prepare_usermode(); 560 561 /* 562 * This returns to the fork trampoline, then to user mode. 563 */ 564 return; 565} 566 567 568/* 569 * List of paths to try when searching for "init". 570 */ 571static char *initpaths[] = { 572 "/sbin/init", 573 "/sbin/oinit", 574 "/sbin/init.bak", 575 "/stand/sysinstall", 576 NULL, 577}; 578 579/* 580 * Start the initial user process; try exec'ing each pathname in "initpaths". 581 * The program is invoked with one argument containing the boot flags. 582 */ 583static void 584start_init(p) 585 struct proc *p; 586{ 587 vm_offset_t addr; 588 struct execve_args args; 589 int options, i, error; 590 char **pathp, *path, *ucp, **uap, *arg0, *arg1; 591 592 initproc = p; 593 594 /* 595 * Need just enough stack to hold the faked-up "execve()" arguments. 596 */ 597 addr = trunc_page(VM_MAXUSER_ADDRESS - PAGE_SIZE); 598 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 599 panic("init: couldn't allocate argument space"); 600 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 601 p->p_vmspace->vm_ssize = 1; 602 603 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 604 /* 605 * Move out the boot flag argument. 606 */ 607 options = 0; 608 ucp = (char *)USRSTACK; 609 (void)subyte(--ucp, 0); /* trailing zero */ 610 if (boothowto & RB_SINGLE) { 611 (void)subyte(--ucp, 's'); 612 options = 1; 613 } 614#ifdef notyet 615 if (boothowto & RB_FASTBOOT) { 616 (void)subyte(--ucp, 'f'); 617 options = 1; 618 } 619#endif 620 621#ifdef BOOTCDROM 622 (void)subyte(--ucp, 'C'); 623 options = 1; 624#endif 625 626#if defined(DEVFS) && defined(DEVFS_ROOT) 627 (void)subyte(--ucp, 'd'); 628 options = 1; 629#endif 630 if (options == 0) 631 (void)subyte(--ucp, '-'); 632 (void)subyte(--ucp, '-'); /* leading hyphen */ 633 arg1 = ucp; 634 635 /* 636 * Move out the file name (also arg 0). 637 */ 638 for (i = strlen(path) + 1; i >= 0; i--) 639 (void)subyte(--ucp, path[i]); 640 arg0 = ucp; 641 642 /* 643 * Move out the arg pointers. 644 */ 645 uap = (char **)((int)ucp & ~(NBPW-1)); 646 (void)suword((caddr_t)--uap, 0); /* terminator */ 647 (void)suword((caddr_t)--uap, (int)arg1); 648 (void)suword((caddr_t)--uap, (int)arg0); 649 650 /* 651 * Point at the arguments. 652 */ 653 args.fname = arg0; 654 args.argv = uap; 655 args.envv = NULL; 656 657 /* 658 * Now try to exec the program. If can't for any reason 659 * other than it doesn't exist, complain. 660 * 661 * Otherwise return to main() which returns to btext 662 * which completes the system startup. 663 */ 664 if ((error = execve(p, &args)) == 0) 665 return; 666 if (error != ENOENT) 667 printf("exec %s: error %d\n", path, error); 668 } 669 printf("init: not found\n"); 670 panic("no init"); 671} 672