init_main.c revision 1.228
1 /* $NetBSD: init_main.c,v 1.228 2003/12/30 12:33:23 pk 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 1.228 2003/12/30 12:33:23 pk 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 87 #include "opencrypto.h" 88 #include "rnd.h" 89 90 #include <sys/param.h> 91 #include <sys/acct.h> 92 #include <sys/filedesc.h> 93 #include <sys/file.h> 94 #include <sys/errno.h> 95 #include <sys/callout.h> 96 #include <sys/kernel.h> 97 #include <sys/mount.h> 98 #include <sys/proc.h> 99 #include <sys/kthread.h> 100 #include <sys/resourcevar.h> 101 #include <sys/signalvar.h> 102 #include <sys/systm.h> 103 #include <sys/vnode.h> 104 #include <sys/tty.h> 105 #include <sys/conf.h> 106 #include <sys/disklabel.h> 107 #include <sys/buf.h> 108 #include <sys/device.h> 109 #include <sys/disk.h> 110 #include <sys/exec.h> 111 #include <sys/socketvar.h> 112 #include <sys/protosw.h> 113 #include <sys/reboot.h> 114 #include <sys/user.h> 115 #include <sys/sysctl.h> 116 #include <sys/event.h> 117 #include <sys/mbuf.h> 118 #ifdef FAST_IPSEC 119 #include <netipsec/ipsec.h> 120 #endif 121 #ifdef SYSVSHM 122 #include <sys/shm.h> 123 #endif 124 #ifdef SYSVSEM 125 #include <sys/sem.h> 126 #endif 127 #ifdef SYSVMSG 128 #include <sys/msg.h> 129 #endif 130 #ifdef P1003_1B_SEMAPHORE 131 #include <sys/ksem.h> 132 #endif 133 #ifdef SYSTRACE 134 #include <sys/systrace.h> 135 #endif 136 #include <sys/domain.h> 137 #include <sys/namei.h> 138 #if NOPENCRYPTO > 0 139 #include <opencrypto/cryptodev.h> /* XXX really the framework */ 140 #endif 141 #if NRND > 0 142 #include <sys/rnd.h> 143 #endif 144 #ifndef PIPE_SOCKETPAIR 145 #include <sys/pipe.h> 146 #endif 147 #ifdef LKM 148 #include <sys/lkm.h> 149 #endif 150 151 #include <sys/syscall.h> 152 #include <sys/sa.h> 153 #include <sys/syscallargs.h> 154 155 #include <ufs/ufs/quota.h> 156 157 #include <miscfs/genfs/genfs.h> 158 #include <miscfs/syncfs/syncfs.h> 159 160 #include <machine/cpu.h> 161 162 #include <uvm/uvm.h> 163 164 #include <dev/cons.h> 165 166 #include <net/if.h> 167 #include <net/raw_cb.h> 168 169 const char copyright[] = 170 "Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003\n" 171 " The NetBSD Foundation, Inc. All rights reserved.\n" 172 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n" 173 " The Regents of the University of California. All rights reserved.\n" 174 "\n"; 175 176 /* Components of the first process -- never freed. */ 177 struct session session0; 178 struct pgrp pgrp0; 179 struct proc proc0; 180 struct lwp lwp0; 181 struct pcred cred0; 182 struct filedesc0 filedesc0; 183 struct cwdinfo cwdi0; 184 struct plimit limit0; 185 struct pstats pstat0; 186 struct vmspace vmspace0; 187 struct sigacts sigacts0; 188 #ifndef curlwp 189 struct lwp *curlwp = &lwp0; 190 #endif 191 struct proc *initproc; 192 193 int nofile = NOFILE; 194 int maxuprc = MAXUPRC; 195 int cmask = CMASK; 196 extern struct user *proc0paddr; 197 198 struct vnode *rootvp, *swapdev_vp; 199 int boothowto; 200 int cold = 1; /* still working on startup */ 201 struct timeval boottime; 202 203 __volatile int start_init_exec; /* semaphore for start_init() */ 204 205 static void check_console(struct proc *p); 206 static void start_init(void *); 207 void main(void); 208 209 extern const struct emul emul_netbsd; /* defined in kern_exec.c */ 210 211 /* 212 * System startup; initialize the world, create process 0, mount root 213 * filesystem, and fork to create init and pagedaemon. Most of the 214 * hard work is done in the lower-level initialization routines including 215 * startup(), which does memory initialization and autoconfiguration. 216 */ 217 void 218 main(void) 219 { 220 struct lwp *l; 221 struct proc *p; 222 struct pdevinit *pdev; 223 int s, error; 224 u_int i; 225 rlim_t lim; 226 extern struct pdevinit pdevinit[]; 227 extern void schedcpu(void *); 228 #if defined(NFSSERVER) || defined(NFS) 229 extern void nfs_init(void); 230 #endif 231 #ifdef NVNODE_IMPLICIT 232 int usevnodes; 233 #endif 234 235 /* 236 * Initialize the current LWP pointer (curlwp) before 237 * any possible traps/probes to simplify trap processing. 238 */ 239 l = &lwp0; 240 curlwp = l; 241 l->l_cpu = curcpu(); 242 l->l_proc = &proc0; 243 l->l_lid = 1; 244 /* 245 * Attempt to find console and initialize 246 * in case of early panic or other messages. 247 */ 248 consinit(); 249 printf("%s", copyright); 250 251 KERNEL_LOCK_INIT(); 252 253 uvm_init(); 254 255 /* Do machine-dependent initialization. */ 256 cpu_startup(); 257 258 /* Initialize callouts. */ 259 callout_startup(); 260 261 /* Initialize the buffer cache */ 262 bufinit(); 263 264 /* 265 * Initialize mbuf's. Do this now because we might attempt to 266 * allocate mbufs or mbuf clusters during autoconfiguration. 267 */ 268 mbinit(); 269 270 /* Initialize kqueues. */ 271 kqueue_init(); 272 273 /* Initialize sockets. */ 274 soinit(); 275 276 /* 277 * The following things must be done before autoconfiguration. 278 */ 279 evcnt_init(); /* initialize event counters */ 280 disk_init(); /* initialize disk list */ 281 tty_init(); /* initialize tty list */ 282 #if NRND > 0 283 rnd_init(); /* initialize RNG */ 284 #endif 285 #if NOPENCRYPTO > 0 286 /* Initialize crypto subsystem before configuring crypto hardware. */ 287 (void)crypto_init(); 288 #endif 289 /* Initialize the sysctl subsystem. */ 290 sysctl_init(); 291 292 /* 293 * Initialize process and pgrp structures. 294 */ 295 procinit(); 296 297 #ifdef LKM 298 /* Initialize the LKM system. */ 299 lkm_init(); 300 #endif 301 302 /* 303 * Create process 0 (the swapper). 304 */ 305 p = &proc0; 306 proc0_insert(p, l, &pgrp0, &session0); 307 308 /* 309 * Set P_NOCLDWAIT so that kernel threads are reparented to 310 * init(8) when they exit. init(8) can easily wait them out 311 * for us. 312 */ 313 p->p_flag = P_SYSTEM | P_NOCLDWAIT; 314 p->p_stat = SACTIVE; 315 p->p_nice = NZERO; 316 p->p_emul = &emul_netbsd; 317 #ifdef __HAVE_SYSCALL_INTERN 318 (*p->p_emul->e_syscall_intern)(p); 319 #endif 320 strncpy(p->p_comm, "swapper", MAXCOMLEN); 321 322 l->l_flag = L_INMEM; 323 l->l_stat = LSONPROC; 324 p->p_nrlwps = 1; 325 326 callout_init(&l->l_tsleep_ch); 327 328 /* Create credentials. */ 329 cred0.p_refcnt = 1; 330 p->p_cred = &cred0; 331 p->p_ucred = crget(); 332 p->p_ucred->cr_ngroups = 1; /* group 0 */ 333 334 /* Create the file descriptor table. */ 335 finit(); 336 p->p_fd = &filedesc0.fd_fd; 337 fdinit1(&filedesc0); 338 339 /* Create the CWD info. */ 340 p->p_cwdi = &cwdi0; 341 cwdi0.cwdi_cmask = cmask; 342 cwdi0.cwdi_refcnt = 1; 343 344 /* Create the limits structures. */ 345 p->p_limit = &limit0; 346 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 347 limit0.pl_rlimit[i].rlim_cur = 348 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 349 350 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 351 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = 352 maxfiles < nofile ? maxfiles : nofile; 353 354 limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 355 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = 356 maxproc < maxuprc ? maxproc : maxuprc; 357 358 lim = ptoa(uvmexp.free); 359 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = lim; 360 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = lim; 361 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = lim / 3; 362 limit0.pl_corename = defcorename; 363 limit0.p_refcnt = 1; 364 365 /* 366 * Initialize proc0's vmspace, which uses the kernel pmap. 367 * All kernel processes (which never have user space mappings) 368 * share proc0's vmspace, and thus, the kernel pmap. 369 */ 370 uvmspace_init(&vmspace0, pmap_kernel(), round_page(VM_MIN_ADDRESS), 371 trunc_page(VM_MAX_ADDRESS)); 372 p->p_vmspace = &vmspace0; 373 374 l->l_addr = proc0paddr; /* XXX */ 375 376 p->p_stats = &pstat0; 377 378 /* 379 * Charge root for one process. 380 */ 381 (void)chgproccnt(0, 1); 382 383 rqinit(); 384 385 /* Configure virtual memory system, set vm rlimits. */ 386 uvm_init_limits(p); 387 388 /* Initialize the file systems. */ 389 #if defined(NFSSERVER) || defined(NFS) 390 nfs_init(); /* initialize server/shared data */ 391 #endif 392 #ifdef NVNODE_IMPLICIT 393 /* 394 * If maximum number of vnodes in namei vnode cache is not explicitly 395 * defined in kernel config, adjust the number such as we use roughly 396 * 0.5% of memory for vnode cache (but not less than NVNODE vnodes). 397 */ 398 usevnodes = (ptoa((unsigned)physmem) / 200) / sizeof(struct vnode); 399 if (usevnodes > desiredvnodes) 400 desiredvnodes = usevnodes; 401 #endif 402 vfsinit(); 403 404 /* Configure the system hardware. This will enable interrupts. */ 405 configure(); 406 407 ubc_init(); /* must be after autoconfig */ 408 409 /* Lock the kernel on behalf of proc0. */ 410 KERNEL_PROC_LOCK(l); 411 412 #ifdef SYSVSHM 413 /* Initialize System V style shared memory. */ 414 shminit(); 415 #endif 416 417 #ifdef SYSVSEM 418 /* Initialize System V style semaphores. */ 419 seminit(); 420 #endif 421 422 #ifdef SYSVMSG 423 /* Initialize System V style message queues. */ 424 msginit(); 425 #endif 426 427 428 #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 process reaper kernel thread. */ 573 if (kthread_create1(reaper, NULL, NULL, "reaper")) 574 panic("fork reaper"); 575 576 /* Create the filesystem syncer kernel thread. */ 577 if (kthread_create1(sched_sync, NULL, NULL, "ioflush")) 578 panic("fork syncer"); 579 580 /* Create the aiodone daemon kernel thread. */ 581 if (kthread_create1(uvm_aiodone_daemon, NULL, &uvm.aiodoned_proc, 582 "aiodoned")) 583 panic("fork aiodoned"); 584 585 #if defined(MULTIPROCESSOR) 586 /* Boot the secondary processors. */ 587 cpu_boot_secondary_processors(); 588 #endif 589 590 /* Initialize exec structures */ 591 exec_init(1); 592 593 #ifndef PIPE_SOCKETPAIR 594 /* Initialize pipe structures */ 595 pipe_init(); 596 #endif 597 598 /* 599 * Okay, now we can let init(8) exec! It's off to userland! 600 */ 601 start_init_exec = 1; 602 wakeup((void *)&start_init_exec); 603 604 /* The scheduler is an infinite loop. */ 605 uvm_scheduler(); 606 /* NOTREACHED */ 607 } 608 609 static void 610 check_console(struct proc *p) 611 { 612 struct nameidata nd; 613 int error; 614 615 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 616 error = namei(&nd); 617 if (error == 0) 618 vrele(nd.ni_vp); 619 else if (error == ENOENT) 620 printf("warning: no /dev/console\n"); 621 else 622 printf("warning: lookup /dev/console: error %d\n", error); 623 } 624 625 /* 626 * List of paths to try when searching for "init". 627 */ 628 static const char *initpaths[] = { 629 "/sbin/init", 630 "/sbin/oinit", 631 "/sbin/init.bak", 632 NULL, 633 }; 634 635 /* 636 * Start the initial user process; try exec'ing each pathname in "initpaths". 637 * The program is invoked with one argument containing the boot flags. 638 */ 639 static void 640 start_init(void *arg) 641 { 642 struct lwp *l = arg; 643 struct proc *p = l->l_proc; 644 vaddr_t addr; 645 struct sys_execve_args /* { 646 syscallarg(const char *) path; 647 syscallarg(char * const *) argp; 648 syscallarg(char * const *) envp; 649 } */ args; 650 int options, i, error; 651 register_t retval[2]; 652 char flags[4], *flagsp; 653 const char *path, *slash; 654 char *ucp, **uap, *arg0, *arg1 = NULL; 655 char ipath[129]; 656 int ipx, len; 657 658 /* 659 * Now in process 1. 660 */ 661 strncpy(p->p_comm, "init", MAXCOMLEN); 662 663 /* 664 * Wait for main() to tell us that it's safe to exec. 665 */ 666 while (start_init_exec == 0) 667 (void) tsleep((void *)&start_init_exec, PWAIT, "initexec", 0); 668 669 /* 670 * This is not the right way to do this. We really should 671 * hand-craft a descriptor onto /dev/console to hand to init, 672 * but that's a _lot_ more work, and the benefit from this easy 673 * hack makes up for the "good is the enemy of the best" effect. 674 */ 675 check_console(p); 676 677 /* 678 * Need just enough stack to hold the faked-up "execve()" arguments. 679 */ 680 addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE); 681 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 682 NULL, UVM_UNKNOWN_OFFSET, 0, 683 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 684 UVM_ADV_NORMAL, 685 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 686 panic("init: couldn't allocate argument space"); 687 p->p_vmspace->vm_maxsaddr = (caddr_t)STACK_MAX(addr, PAGE_SIZE); 688 689 ipx = 0; 690 while (1) { 691 if (boothowto & RB_ASKNAME) { 692 printf("init path"); 693 if (initpaths[ipx]) 694 printf(" (default %s)", initpaths[ipx]); 695 printf(": "); 696 len = cngetsn(ipath, sizeof(ipath)-1); 697 if (len == 0) { 698 if (initpaths[ipx]) 699 path = initpaths[ipx++]; 700 else 701 continue; 702 } else { 703 ipath[len] = '\0'; 704 path = ipath; 705 } 706 } else { 707 if ((path = initpaths[ipx++]) == NULL) 708 break; 709 } 710 711 ucp = (char *)USRSTACK; 712 713 /* 714 * Construct the boot flag argument. 715 */ 716 flagsp = flags; 717 *flagsp++ = '-'; 718 options = 0; 719 720 if (boothowto & RB_SINGLE) { 721 *flagsp++ = 's'; 722 options = 1; 723 } 724 #ifdef notyet 725 if (boothowto & RB_FASTBOOT) { 726 *flagsp++ = 'f'; 727 options = 1; 728 } 729 #endif 730 731 /* 732 * Move out the flags (arg 1), if necessary. 733 */ 734 if (options != 0) { 735 *flagsp++ = '\0'; 736 i = flagsp - flags; 737 #ifdef DEBUG 738 printf("init: copying out flags `%s' %d\n", flags, i); 739 #endif 740 arg1 = STACK_ALLOC(ucp, i); 741 ucp = STACK_MAX(arg1, i); 742 (void)copyout((caddr_t)flags, arg1, i); 743 } 744 745 /* 746 * Move out the file name (also arg 0). 747 */ 748 i = strlen(path) + 1; 749 #ifdef DEBUG 750 printf("init: copying out path `%s' %d\n", path, i); 751 #else 752 if (boothowto & RB_ASKNAME || path != initpaths[0]) 753 printf("init: trying %s\n", path); 754 #endif 755 arg0 = STACK_ALLOC(ucp, i); 756 ucp = STACK_MAX(arg0, i); 757 (void)copyout((caddr_t)path, arg0, i); 758 759 /* 760 * Move out the arg pointers. 761 */ 762 ucp = (caddr_t)STACK_ALIGN(ucp, ALIGNBYTES); 763 uap = (char **)STACK_ALLOC(ucp, sizeof(char *) * 3); 764 SCARG(&args, path) = arg0; 765 SCARG(&args, argp) = uap; 766 SCARG(&args, envp) = NULL; 767 slash = strrchr(path, '/'); 768 if (slash) 769 (void)suword((caddr_t)uap++, 770 (long)arg0 + (slash + 1 - path)); 771 else 772 (void)suword((caddr_t)uap++, (long)arg0); 773 if (options != 0) 774 (void)suword((caddr_t)uap++, (long)arg1); 775 (void)suword((caddr_t)uap++, 0); /* terminator */ 776 777 /* 778 * Now try to exec the program. If can't for any reason 779 * other than it doesn't exist, complain. 780 */ 781 error = sys_execve(LIST_FIRST(&p->p_lwps), &args, retval); 782 if (error == 0 || error == EJUSTRETURN) { 783 KERNEL_PROC_UNLOCK(l); 784 return; 785 } 786 printf("exec %s: error %d\n", path, error); 787 } 788 printf("init: not found\n"); 789 panic("no init"); 790 } 791
Indexes created Tue Sep 23 07:09:52 GMT 2025