Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/init_main.c
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1 /* $NetBSD: init_main.c,v 1.235 2004/03/28 22:43:56 matt Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)init_main.c 8.16 (Berkeley) 5/14/95 37 */ 38 39 /* 40 * Copyright (c) 1995 Christopher G. Demetriou. All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by the University of 53 * California, Berkeley and its contributors. 54 * 4. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 * @(#)init_main.c 8.16 (Berkeley) 5/14/95 71 */ 72 73 #include <sys/cdefs.h> 74 __KERNEL_RCSID(0, "$NetBSD: init_main.c,v 1.235 2004/03/28 22:43:56 matt Exp $"); 75 76 #include "fs_nfs.h" 77 #include "opt_nfsserver.h" 78 #include "opt_ipsec.h" 79 #include "opt_sysv.h" 80 #include "opt_maxuprc.h" 81 #include "opt_multiprocessor.h" 82 #include "opt_pipe.h" 83 #include "opt_syscall_debug.h" 84 #include "opt_systrace.h" 85 #include "opt_posix.h" 86 #include "opt_kcont.h" 87 88 #include "opencrypto.h" 89 #include "rnd.h" 90 91 #include <sys/param.h> 92 #include <sys/acct.h> 93 #include <sys/filedesc.h> 94 #include <sys/file.h> 95 #include <sys/errno.h> 96 #include <sys/callout.h> 97 #include <sys/kernel.h> 98 #include <sys/kcont.h> 99 #include <sys/mount.h> 100 #include <sys/proc.h> 101 #include <sys/kthread.h> 102 #include <sys/resourcevar.h> 103 #include <sys/signalvar.h> 104 #include <sys/systm.h> 105 #include <sys/vnode.h> 106 #include <sys/tty.h> 107 #include <sys/conf.h> 108 #include <sys/disklabel.h> 109 #include <sys/buf.h> 110 #include <sys/device.h> 111 #include <sys/disk.h> 112 #include <sys/exec.h> 113 #include <sys/socketvar.h> 114 #include <sys/protosw.h> 115 #include <sys/reboot.h> 116 #include <sys/user.h> 117 #include <sys/sysctl.h> 118 #include <sys/event.h> 119 #include <sys/mbuf.h> 120 #ifdef FAST_IPSEC 121 #include <netipsec/ipsec.h> 122 #endif 123 #ifdef SYSVSHM 124 #include <sys/shm.h> 125 #endif 126 #ifdef SYSVSEM 127 #include <sys/sem.h> 128 #endif 129 #ifdef SYSVMSG 130 #include <sys/msg.h> 131 #endif 132 #ifdef P1003_1B_SEMAPHORE 133 #include <sys/ksem.h> 134 #endif 135 #ifdef SYSTRACE 136 #include <sys/systrace.h> 137 #endif 138 #include <sys/domain.h> 139 #include <sys/namei.h> 140 #if NOPENCRYPTO > 0 141 #include <opencrypto/cryptodev.h> /* XXX really the framework */ 142 #endif 143 #if NRND > 0 144 #include <sys/rnd.h> 145 #endif 146 #ifndef PIPE_SOCKETPAIR 147 #include <sys/pipe.h> 148 #endif 149 #ifdef LKM 150 #include <sys/lkm.h> 151 #endif 152 153 #include <sys/syscall.h> 154 #include <sys/sa.h> 155 #include <sys/syscallargs.h> 156 157 #include <ufs/ufs/quota.h> 158 159 #include <miscfs/genfs/genfs.h> 160 #include <miscfs/syncfs/syncfs.h> 161 162 #include <machine/cpu.h> 163 164 #include <uvm/uvm.h> 165 166 #include <dev/cons.h> 167 168 #include <net/if.h> 169 #include <net/raw_cb.h> 170 171 /* Components of the first process -- never freed. */ 172 struct session session0; 173 struct pgrp pgrp0; 174 struct proc proc0; 175 struct lwp lwp0; 176 struct pcred cred0; 177 struct filedesc0 filedesc0; 178 struct cwdinfo cwdi0; 179 struct plimit limit0; 180 struct pstats pstat0; 181 struct vmspace vmspace0; 182 struct sigacts sigacts0; 183 #ifndef curlwp 184 struct lwp *curlwp = &lwp0; 185 #endif 186 struct proc *initproc; 187 188 int nofile = NOFILE; 189 int maxuprc = MAXUPRC; 190 int cmask = CMASK; 191 extern struct user *proc0paddr; 192 193 struct vnode *rootvp, *swapdev_vp; 194 int boothowto; 195 int cold = 1; /* still working on startup */ 196 struct timeval boottime; 197 198 __volatile int start_init_exec; /* semaphore for start_init() */ 199 200 static void check_console(struct proc *p); 201 static void start_init(void *); 202 void main(void); 203 204 extern const struct emul emul_netbsd; /* defined in kern_exec.c */ 205 206 /* 207 * System startup; initialize the world, create process 0, mount root 208 * filesystem, and fork to create init and pagedaemon. Most of the 209 * hard work is done in the lower-level initialization routines including 210 * startup(), which does memory initialization and autoconfiguration. 211 */ 212 void 213 main(void) 214 { 215 struct lwp *l; 216 struct proc *p; 217 struct pdevinit *pdev; 218 int s, error; 219 u_int i; 220 rlim_t lim; 221 extern struct pdevinit pdevinit[]; 222 extern void schedcpu(void *); 223 #if defined(NFSSERVER) || defined(NFS) 224 extern void nfs_init(void); 225 #endif 226 #ifdef NVNODE_IMPLICIT 227 int usevnodes; 228 #endif 229 230 /* 231 * Initialize the current LWP pointer (curlwp) before 232 * any possible traps/probes to simplify trap processing. 233 */ 234 l = &lwp0; 235 curlwp = l; 236 l->l_cpu = curcpu(); 237 l->l_proc = &proc0; 238 l->l_lid = 1; 239 240 /* 241 * Attempt to find console and initialize 242 * in case of early panic or other messages. 243 */ 244 consinit(); 245 printf("%s", copyright); 246 247 KERNEL_LOCK_INIT(); 248 249 uvm_init(); 250 251 /* Do machine-dependent initialization. */ 252 cpu_startup(); 253 254 /* Initialize callouts. */ 255 callout_startup(); 256 257 /* Initialize the buffer cache */ 258 bufinit(); 259 260 /* 261 * Initialize mbuf's. Do this now because we might attempt to 262 * allocate mbufs or mbuf clusters during autoconfiguration. 263 */ 264 mbinit(); 265 266 /* Initialize kqueues. */ 267 kqueue_init(); 268 269 /* Initialize sockets. */ 270 soinit(); 271 272 #ifdef KCONT 273 /* Initialize kcont. */ 274 kcont_init(); 275 #endif 276 277 /* 278 * The following things must be done before autoconfiguration. 279 */ 280 evcnt_init(); /* initialize event counters */ 281 disk_init(); /* initialize disk list */ 282 tty_init(); /* initialize tty list */ 283 #if NRND > 0 284 rnd_init(); /* initialize RNG */ 285 #endif 286 #if NOPENCRYPTO > 0 287 /* Initialize crypto subsystem before configuring crypto hardware. */ 288 (void)crypto_init(); 289 #endif 290 /* Initialize the sysctl subsystem. */ 291 sysctl_init(); 292 293 /* 294 * Initialize process and pgrp structures. 295 */ 296 procinit(); 297 298 #ifdef LKM 299 /* Initialize the LKM system. */ 300 lkm_init(); 301 #endif 302 303 /* 304 * Create process 0 (the swapper). 305 */ 306 p = &proc0; 307 proc0_insert(p, l, &pgrp0, &session0); 308 309 /* 310 * Set P_NOCLDWAIT so that kernel threads are reparented to 311 * init(8) when they exit. init(8) can easily wait them out 312 * for us. 313 */ 314 p->p_flag = P_SYSTEM | P_NOCLDWAIT; 315 p->p_stat = SACTIVE; 316 p->p_nice = NZERO; 317 p->p_emul = &emul_netbsd; 318 #ifdef __HAVE_SYSCALL_INTERN 319 (*p->p_emul->e_syscall_intern)(p); 320 #endif 321 strncpy(p->p_comm, "swapper", MAXCOMLEN); 322 323 l->l_flag = L_INMEM; 324 l->l_stat = LSONPROC; 325 p->p_nrlwps = 1; 326 327 callout_init(&l->l_tsleep_ch); 328 329 /* Create credentials. */ 330 cred0.p_refcnt = 1; 331 p->p_cred = &cred0; 332 p->p_ucred = crget(); 333 p->p_ucred->cr_ngroups = 1; /* group 0 */ 334 335 /* Create the file descriptor table. */ 336 finit(); 337 p->p_fd = &filedesc0.fd_fd; 338 fdinit1(&filedesc0); 339 340 /* Create the CWD info. */ 341 p->p_cwdi = &cwdi0; 342 cwdi0.cwdi_cmask = cmask; 343 cwdi0.cwdi_refcnt = 1; 344 345 /* Create the limits structures. */ 346 p->p_limit = &limit0; 347 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 348 limit0.pl_rlimit[i].rlim_cur = 349 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 350 351 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 352 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = 353 maxfiles < nofile ? maxfiles : nofile; 354 355 limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 356 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = 357 maxproc < maxuprc ? maxproc : maxuprc; 358 359 lim = ptoa(uvmexp.free); 360 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = lim; 361 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = lim; 362 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = lim / 3; 363 limit0.pl_corename = defcorename; 364 limit0.p_refcnt = 1; 365 366 /* 367 * Initialize proc0's vmspace, which uses the kernel pmap. 368 * All kernel processes (which never have user space mappings) 369 * share proc0's vmspace, and thus, the kernel pmap. 370 */ 371 uvmspace_init(&vmspace0, pmap_kernel(), round_page(VM_MIN_ADDRESS), 372 trunc_page(VM_MAX_ADDRESS)); 373 p->p_vmspace = &vmspace0; 374 375 l->l_addr = proc0paddr; /* XXX */ 376 377 p->p_stats = &pstat0; 378 379 /* 380 * Charge root for one process. 381 */ 382 (void)chgproccnt(0, 1); 383 384 rqinit(); 385 386 /* Configure virtual memory system, set vm rlimits. */ 387 uvm_init_limits(p); 388 389 /* Initialize the file systems. */ 390 #if defined(NFSSERVER) || defined(NFS) 391 nfs_init(); /* initialize server/shared data */ 392 #endif 393 #ifdef NVNODE_IMPLICIT 394 /* 395 * If maximum number of vnodes in namei vnode cache is not explicitly 396 * defined in kernel config, adjust the number such as we use roughly 397 * 1.0% of memory for vnode cache (but not less than NVNODE vnodes). 398 */ 399 usevnodes = (ptoa((unsigned)physmem) / 100) / sizeof(struct vnode); 400 if (usevnodes > desiredvnodes) 401 desiredvnodes = usevnodes; 402 #endif 403 vfsinit(); 404 405 /* Configure the system hardware. This will enable interrupts. */ 406 configure(); 407 408 ubc_init(); /* must be after autoconfig */ 409 410 /* Lock the kernel on behalf of proc0. */ 411 KERNEL_PROC_LOCK(l); 412 413 #ifdef SYSVSHM 414 /* Initialize System V style shared memory. */ 415 shminit(); 416 #endif 417 418 #ifdef SYSVSEM 419 /* Initialize System V style semaphores. */ 420 seminit(); 421 #endif 422 423 #ifdef SYSVMSG 424 /* Initialize System V style message queues. */ 425 msginit(); 426 #endif 427 428 #ifdef P1003_1B_SEMAPHORE 429 /* Initialize posix semaphores */ 430 ksem_init(); 431 #endif 432 /* Attach pseudo-devices. */ 433 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 434 (*pdev->pdev_attach)(pdev->pdev_count); 435 436 #ifdef FAST_IPSEC 437 /* Attach network crypto subsystem */ 438 ipsec_attach(); 439 #endif 440 441 /* 442 * Initialize protocols. Block reception of incoming packets 443 * until everything is ready. 444 */ 445 s = splnet(); 446 ifinit(); 447 domaininit(); 448 if_attachdomain(); 449 splx(s); 450 451 #ifdef GPROF 452 /* Initialize kernel profiling. */ 453 kmstartup(); 454 #endif 455 456 /* Initialize system accouting. */ 457 acct_init(); 458 459 #ifdef SYSTRACE 460 systrace_init(); 461 #endif 462 /* 463 * Initialize signal-related data structures, and signal state 464 * for proc0. 465 */ 466 signal_init(); 467 p->p_sigacts = &sigacts0; 468 siginit(p); 469 470 /* Kick off timeout driven events by calling first time. */ 471 schedcpu(NULL); 472 473 /* 474 * Create process 1 (init(8)). We do this now, as Unix has 475 * historically had init be process 1, and changing this would 476 * probably upset a lot of people. 477 * 478 * Note that process 1 won't immediately exec init(8), but will 479 * wait for us to inform it that the root file system has been 480 * mounted. 481 */ 482 if (fork1(l, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 483 panic("fork init"); 484 485 /* 486 * Create any kernel threads who's creation was deferred because 487 * initproc had not yet been created. 488 */ 489 kthread_run_deferred_queue(); 490 491 /* 492 * Now that device driver threads have been created, wait for 493 * them to finish any deferred autoconfiguration. Note we don't 494 * need to lock this semaphore, since we haven't booted any 495 * secondary processors, yet. 496 */ 497 while (config_pending) 498 (void) tsleep((void *)&config_pending, PWAIT, "cfpend", 0); 499 500 /* 501 * Finalize configuration now that all real devices have been 502 * found. This needs to be done before the root device is 503 * selected, since finalization may create the root device. 504 */ 505 config_finalize(); 506 507 /* 508 * Now that autoconfiguration has completed, we can determine 509 * the root and dump devices. 510 */ 511 cpu_rootconf(); 512 cpu_dumpconf(); 513 514 /* Mount the root file system. */ 515 do { 516 domountroothook(); 517 if ((error = vfs_mountroot())) { 518 printf("cannot mount root, error = %d\n", error); 519 boothowto |= RB_ASKNAME; 520 setroot(root_device, 521 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 522 } 523 } while (error != 0); 524 mountroothook_destroy(); 525 526 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 527 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 528 529 /* 530 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 531 * reference it. 532 */ 533 if (VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode)) 534 panic("cannot find root vnode"); 535 cwdi0.cwdi_cdir = rootvnode; 536 VREF(cwdi0.cwdi_cdir); 537 VOP_UNLOCK(rootvnode, 0); 538 cwdi0.cwdi_rdir = NULL; 539 540 /* 541 * Now that root is mounted, we can fixup initproc's CWD 542 * info. All other processes are kthreads, which merely 543 * share proc0's CWD info. 544 */ 545 initproc->p_cwdi->cwdi_cdir = rootvnode; 546 VREF(initproc->p_cwdi->cwdi_cdir); 547 initproc->p_cwdi->cwdi_rdir = NULL; 548 549 /* 550 * Now can look at time, having had a chance to verify the time 551 * from the file system. Reset p->p_rtime as it may have been 552 * munched in mi_switch() after the time got set. 553 */ 554 proclist_lock_read(); 555 s = splsched(); 556 LIST_FOREACH(p, &allproc, p_list) { 557 p->p_stats->p_start = mono_time = boottime = time; 558 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 559 if (l->l_cpu != NULL) 560 l->l_cpu->ci_schedstate.spc_runtime = time; 561 } 562 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 563 } 564 splx(s); 565 proclist_unlock_read(); 566 567 /* Create the pageout daemon kernel thread. */ 568 uvm_swap_init(); 569 if (kthread_create1(uvm_pageout, NULL, NULL, "pagedaemon")) 570 panic("fork pagedaemon"); 571 572 /* Create the filesystem syncer kernel thread. */ 573 if (kthread_create1(sched_sync, NULL, NULL, "ioflush")) 574 panic("fork syncer"); 575 576 /* Create the aiodone daemon kernel thread. */ 577 if (kthread_create1(uvm_aiodone_daemon, NULL, &uvm.aiodoned_proc, 578 "aiodoned")) 579 panic("fork aiodoned"); 580 581 #if defined(MULTIPROCESSOR) 582 /* Boot the secondary processors. */ 583 cpu_boot_secondary_processors(); 584 #endif 585 586 /* Initialize exec structures */ 587 exec_init(1); 588 589 #ifndef PIPE_SOCKETPAIR 590 /* Initialize pipe structures */ 591 pipe_init(); 592 #endif 593 594 /* 595 * Okay, now we can let init(8) exec! It's off to userland! 596 */ 597 start_init_exec = 1; 598 wakeup((void *)&start_init_exec); 599 600 /* The scheduler is an infinite loop. */ 601 uvm_scheduler(); 602 /* NOTREACHED */ 603 } 604 605 static void 606 check_console(struct proc *p) 607 { 608 struct nameidata nd; 609 int error; 610 611 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 612 error = namei(&nd); 613 if (error == 0) 614 vrele(nd.ni_vp); 615 else if (error == ENOENT) 616 printf("warning: no /dev/console\n"); 617 else 618 printf("warning: lookup /dev/console: error %d\n", error); 619 } 620 621 /* 622 * List of paths to try when searching for "init". 623 */ 624 static const char *initpaths[] = { 625 "/sbin/init", 626 "/sbin/oinit", 627 "/sbin/init.bak", 628 NULL, 629 }; 630 631 /* 632 * Start the initial user process; try exec'ing each pathname in "initpaths". 633 * The program is invoked with one argument containing the boot flags. 634 */ 635 static void 636 start_init(void *arg) 637 { 638 struct lwp *l = arg; 639 struct proc *p = l->l_proc; 640 vaddr_t addr; 641 struct sys_execve_args /* { 642 syscallarg(const char *) path; 643 syscallarg(char * const *) argp; 644 syscallarg(char * const *) envp; 645 } */ args; 646 int options, i, error; 647 register_t retval[2]; 648 char flags[4], *flagsp; 649 const char *path, *slash; 650 char *ucp, **uap, *arg0, *arg1 = NULL; 651 char ipath[129]; 652 int ipx, len; 653 654 /* 655 * Now in process 1. 656 */ 657 strncpy(p->p_comm, "init", MAXCOMLEN); 658 659 /* 660 * Wait for main() to tell us that it's safe to exec. 661 */ 662 while (start_init_exec == 0) 663 (void) tsleep((void *)&start_init_exec, PWAIT, "initexec", 0); 664 665 /* 666 * This is not the right way to do this. We really should 667 * hand-craft a descriptor onto /dev/console to hand to init, 668 * but that's a _lot_ more work, and the benefit from this easy 669 * hack makes up for the "good is the enemy of the best" effect. 670 */ 671 check_console(p); 672 673 /* 674 * Need just enough stack to hold the faked-up "execve()" arguments. 675 */ 676 addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE); 677 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 678 NULL, UVM_UNKNOWN_OFFSET, 0, 679 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 680 UVM_ADV_NORMAL, 681 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 682 panic("init: couldn't allocate argument space"); 683 p->p_vmspace->vm_maxsaddr = (caddr_t)STACK_MAX(addr, PAGE_SIZE); 684 685 ipx = 0; 686 while (1) { 687 if (boothowto & RB_ASKNAME) { 688 printf("init path"); 689 if (initpaths[ipx]) 690 printf(" (default %s)", initpaths[ipx]); 691 printf(": "); 692 len = cngetsn(ipath, sizeof(ipath)-1); 693 if (len == 0) { 694 if (initpaths[ipx]) 695 path = initpaths[ipx++]; 696 else 697 continue; 698 } else { 699 ipath[len] = '\0'; 700 path = ipath; 701 } 702 } else { 703 if ((path = initpaths[ipx++]) == NULL) 704 break; 705 } 706 707 ucp = (char *)USRSTACK; 708 709 /* 710 * Construct the boot flag argument. 711 */ 712 flagsp = flags; 713 *flagsp++ = '-'; 714 options = 0; 715 716 if (boothowto & RB_SINGLE) { 717 *flagsp++ = 's'; 718 options = 1; 719 } 720 #ifdef notyet 721 if (boothowto & RB_FASTBOOT) { 722 *flagsp++ = 'f'; 723 options = 1; 724 } 725 #endif 726 727 /* 728 * Move out the flags (arg 1), if necessary. 729 */ 730 if (options != 0) { 731 *flagsp++ = '\0'; 732 i = flagsp - flags; 733 #ifdef DEBUG 734 printf("init: copying out flags `%s' %d\n", flags, i); 735 #endif 736 arg1 = STACK_ALLOC(ucp, i); 737 ucp = STACK_MAX(arg1, i); 738 (void)copyout((caddr_t)flags, arg1, i); 739 } 740 741 /* 742 * Move out the file name (also arg 0). 743 */ 744 i = strlen(path) + 1; 745 #ifdef DEBUG 746 printf("init: copying out path `%s' %d\n", path, i); 747 #else 748 if (boothowto & RB_ASKNAME || path != initpaths[0]) 749 printf("init: trying %s\n", path); 750 #endif 751 arg0 = STACK_ALLOC(ucp, i); 752 ucp = STACK_MAX(arg0, i); 753 (void)copyout((caddr_t)path, arg0, i); 754 755 /* 756 * Move out the arg pointers. 757 */ 758 ucp = (caddr_t)STACK_ALIGN(ucp, ALIGNBYTES); 759 uap = (char **)STACK_ALLOC(ucp, sizeof(char *) * 3); 760 SCARG(&args, path) = arg0; 761 SCARG(&args, argp) = uap; 762 SCARG(&args, envp) = NULL; 763 slash = strrchr(path, '/'); 764 if (slash) 765 (void)suword((caddr_t)uap++, 766 (long)arg0 + (slash + 1 - path)); 767 else 768 (void)suword((caddr_t)uap++, (long)arg0); 769 if (options != 0) 770 (void)suword((caddr_t)uap++, (long)arg1); 771 (void)suword((caddr_t)uap++, 0); /* terminator */ 772 773 /* 774 * Now try to exec the program. If can't for any reason 775 * other than it doesn't exist, complain. 776 */ 777 error = sys_execve(LIST_FIRST(&p->p_lwps), &args, retval); 778 if (error == 0 || error == EJUSTRETURN) { 779 KERNEL_PROC_UNLOCK(l); 780 return; 781 } 782 printf("exec %s: error %d\n", path, error); 783 } 784 printf("init: not found\n"); 785 panic("no init"); 786 }
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