init_main.c revision 1.106
1 /* $NetBSD: init_main.c,v 1.106 1997/10/13 00:48:07 explorer Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Christopher G. Demetriou. All rights reserved. 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 */ 43 44 #include "rnd.h" 45 46 #include <sys/param.h> 47 #include <sys/filedesc.h> 48 #include <sys/errno.h> 49 #include <sys/exec.h> 50 #include <sys/kernel.h> 51 #include <sys/mount.h> 52 #include <sys/map.h> 53 #include <sys/proc.h> 54 #include <sys/resourcevar.h> 55 #include <sys/signalvar.h> 56 #include <sys/systm.h> 57 #include <sys/vnode.h> 58 #include <sys/tty.h> 59 #include <sys/conf.h> 60 #include <sys/disklabel.h> 61 #include <sys/buf.h> 62 #ifdef REAL_CLISTS 63 #include <sys/clist.h> 64 #endif 65 #include <sys/device.h> 66 #include <sys/protosw.h> 67 #include <sys/reboot.h> 68 #include <sys/user.h> 69 #ifdef SYSVSHM 70 #include <sys/shm.h> 71 #endif 72 #ifdef SYSVSEM 73 #include <sys/sem.h> 74 #endif 75 #ifdef SYSVMSG 76 #include <sys/msg.h> 77 #endif 78 #include <sys/domain.h> 79 #include <sys/mbuf.h> 80 #include <sys/namei.h> 81 #if NRND > 0 82 #include <sys/rnd.h> 83 #endif 84 85 #include <sys/syscall.h> 86 #include <sys/syscallargs.h> 87 88 #include <ufs/ufs/quota.h> 89 90 #include <machine/cpu.h> 91 92 #include <vm/vm.h> 93 #include <vm/vm_pageout.h> 94 95 #include <net/if.h> 96 #include <net/raw_cb.h> 97 98 char copyright[] = 99 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n The Regents of the University of California. All rights reserved.\n\n"; 100 101 /* Components of the first process -- never freed. */ 102 struct session session0; 103 struct pgrp pgrp0; 104 struct proc proc0; 105 struct pcred cred0; 106 struct filedesc0 filedesc0; 107 struct plimit limit0; 108 struct vmspace vmspace0; 109 struct proc *curproc = &proc0; 110 struct proc *initproc; 111 112 int cmask = CMASK; 113 extern struct user *proc0paddr; 114 115 struct vnode *rootvp, *swapdev_vp; 116 int boothowto; 117 struct timeval boottime; 118 struct timeval runtime; 119 120 static void check_console __P((struct proc *p)); 121 static void start_init __P((struct proc *)); 122 static void start_pagedaemon __P((struct proc *)); 123 void main __P((void *)); 124 125 #ifdef cpu_set_init_frame 126 void *initframep; /* XXX should go away */ 127 #endif 128 129 extern char sigcode[], esigcode[]; 130 #ifdef SYSCALL_DEBUG 131 extern char *syscallnames[]; 132 #endif 133 134 struct emul emul_netbsd = { 135 "netbsd", 136 NULL, 137 sendsig, 138 SYS_syscall, 139 SYS_MAXSYSCALL, 140 sysent, 141 #ifdef SYSCALL_DEBUG 142 syscallnames, 143 #else 144 NULL, 145 #endif 146 0, 147 copyargs, 148 setregs, 149 sigcode, 150 esigcode, 151 }; 152 153 /* 154 * System startup; initialize the world, create process 0, mount root 155 * filesystem, and fork to create init and pagedaemon. Most of the 156 * hard work is done in the lower-level initialization routines including 157 * startup(), which does memory initialization and autoconfiguration. 158 */ 159 void 160 main(framep) 161 void *framep; /* XXX should go away */ 162 { 163 register struct proc *p; 164 register struct pdevinit *pdev; 165 register int i; 166 int s, error; 167 register_t rval[2]; 168 extern struct pdevinit pdevinit[]; 169 extern void roundrobin __P((void *)); 170 extern void schedcpu __P((void *)); 171 extern void disk_init __P((void)); 172 #if defined(NFSSERVER) || defined(NFS) 173 extern void nfs_init __P((void)); 174 #endif 175 176 /* 177 * Initialize the current process pointer (curproc) before 178 * any possible traps/probes to simplify trap processing. 179 */ 180 p = &proc0; 181 curproc = p; 182 /* 183 * Attempt to find console and initialize 184 * in case of early panic or other messages. 185 */ 186 consinit(); 187 printf(copyright); 188 189 vm_mem_init(); 190 kmeminit(); 191 disk_init(); /* must come before autoconfiguration */ 192 tty_init(); /* initialise tty list */ 193 #if NRND > 0 194 rnd_init(); 195 #endif 196 config_init(); /* init autoconfiguration data structures */ 197 cpu_startup(); 198 199 /* 200 * Initialize process and pgrp structures. 201 */ 202 procinit(); 203 204 /* 205 * Create process 0 (the swapper). 206 */ 207 LIST_INSERT_HEAD(&allproc, p, p_list); 208 p->p_pgrp = &pgrp0; 209 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 210 LIST_INIT(&pgrp0.pg_members); 211 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 212 213 pgrp0.pg_session = &session0; 214 session0.s_count = 1; 215 session0.s_leader = p; 216 217 p->p_flag = P_INMEM | P_SYSTEM; 218 p->p_stat = SRUN; 219 p->p_nice = NZERO; 220 p->p_emul = &emul_netbsd; 221 bcopy("swapper", p->p_comm, sizeof ("swapper")); 222 223 /* Create credentials. */ 224 cred0.p_refcnt = 1; 225 p->p_cred = &cred0; 226 p->p_ucred = crget(); 227 p->p_ucred->cr_ngroups = 1; /* group 0 */ 228 229 /* Create the file descriptor table. */ 230 p->p_fd = &filedesc0.fd_fd; 231 filedesc0.fd_fd.fd_refcnt = 1; 232 filedesc0.fd_fd.fd_cmask = cmask; 233 filedesc0.fd_fd.fd_ofiles = filedesc0.fd_dfiles; 234 filedesc0.fd_fd.fd_ofileflags = filedesc0.fd_dfileflags; 235 filedesc0.fd_fd.fd_nfiles = NDFILE; 236 237 /* Create the limits structures. */ 238 p->p_limit = &limit0; 239 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 240 limit0.pl_rlimit[i].rlim_cur = 241 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 242 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE; 243 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC; 244 i = ptoa(cnt.v_free_count); 245 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 246 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 247 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 248 limit0.p_refcnt = 1; 249 250 /* Allocate a prototype map so we have something to fork. */ 251 p->p_vmspace = vmspace_alloc(round_page(VM_MIN_ADDRESS), 252 trunc_page(VM_MAX_ADDRESS), TRUE); 253 254 p->p_addr = proc0paddr; /* XXX */ 255 256 /* 257 * We continue to place resource usage info and signal 258 * actions in the user struct so they're pageable. 259 */ 260 p->p_stats = &p->p_addr->u_stats; 261 p->p_sigacts = &p->p_addr->u_sigacts; 262 263 /* 264 * Charge root for one process. 265 */ 266 (void)chgproccnt(0, 1); 267 268 rqinit(); 269 270 /* Configure virtual memory system, set vm rlimits. */ 271 vm_init_limits(p); 272 273 /* Initialize the file systems. */ 274 #if defined(NFSSERVER) || defined(NFS) 275 nfs_init(); /* initialize server/shared data */ 276 #endif 277 vfsinit(); 278 279 /* Start real time and statistics clocks. */ 280 initclocks(); 281 282 /* Initialize mbuf's. */ 283 mbinit(); 284 285 #ifdef REAL_CLISTS 286 /* Initialize clists. */ 287 clist_init(); 288 #endif 289 290 #ifdef SYSVSHM 291 /* Initialize System V style shared memory. */ 292 shminit(); 293 #endif 294 295 #ifdef SYSVSEM 296 /* Initialize System V style semaphores. */ 297 seminit(); 298 #endif 299 300 #ifdef SYSVMSG 301 /* Initialize System V style message queues. */ 302 msginit(); 303 #endif 304 305 /* Attach pseudo-devices. */ 306 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 307 (*pdev->pdev_attach)(pdev->pdev_count); 308 309 /* 310 * Initialize protocols. Block reception of incoming packets 311 * until everything is ready. 312 */ 313 s = splimp(); 314 ifinit(); 315 domaininit(); 316 splx(s); 317 318 #ifdef GPROF 319 /* Initialize kernel profiling. */ 320 kmstartup(); 321 #endif 322 323 /* Kick off timeout driven events by calling first time. */ 324 roundrobin(NULL); 325 schedcpu(NULL); 326 327 /* Determine the root and dump devices. */ 328 cpu_rootconf(); 329 cpu_dumpconf(); 330 331 /* Mount the root file system. */ 332 do { 333 domountroothook(); 334 if ((error = vfs_mountroot())) { 335 printf("cannot mount root, error = %d\n", error); 336 boothowto |= RB_ASKNAME; 337 setroot(root_device, 338 (rootdev != NODEV) ? DISKPART(rootdev) : 0, NULL); 339 } 340 } while (error != 0); 341 mountroothook_destroy(); 342 343 mountlist.cqh_first->mnt_flag |= MNT_ROOTFS; 344 mountlist.cqh_first->mnt_op->vfs_refcount++; 345 346 /* Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to reference it. */ 347 if (VFS_ROOT(mountlist.cqh_first, &rootvnode)) 348 panic("cannot find root vnode"); 349 filedesc0.fd_fd.fd_cdir = rootvnode; 350 VREF(filedesc0.fd_fd.fd_cdir); 351 VOP_UNLOCK(rootvnode); 352 filedesc0.fd_fd.fd_rdir = NULL; 353 swapinit(); 354 355 /* 356 * Now can look at time, having had a chance to verify the time 357 * from the file system. Reset p->p_rtime as it may have been 358 * munched in mi_switch() after the time got set. 359 */ 360 p->p_stats->p_start = runtime = mono_time = boottime = time; 361 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 362 363 /* Initialize signal state for process 0. */ 364 siginit(p); 365 366 /* Create process 1 (init(8)). */ 367 if (sys_fork(p, NULL, rval)) 368 panic("fork init"); 369 #ifdef cpu_set_init_frame /* XXX should go away */ 370 if (rval[1]) { 371 /* 372 * Now in process 1. 373 */ 374 initframep = framep; 375 start_init(curproc); 376 return; 377 } 378 #else 379 cpu_set_kpc(pfind(1), start_init); 380 #endif 381 382 /* Create process 2 (the pageout daemon). */ 383 if (sys_fork(p, NULL, rval)) 384 panic("fork pager"); 385 #ifdef cpu_set_init_frame /* XXX should go away */ 386 if (rval[1]) { 387 /* 388 * Now in process 2. 389 */ 390 start_pagedaemon(curproc); 391 } 392 #else 393 cpu_set_kpc(pfind(2), start_pagedaemon); 394 #endif 395 396 /* The scheduler is an infinite loop. */ 397 scheduler(); 398 /* NOTREACHED */ 399 } 400 401 static void 402 check_console(p) 403 struct proc *p; 404 { 405 struct nameidata nd; 406 int error; 407 408 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 409 error = namei(&nd); 410 if (error == 0) 411 vrele(nd.ni_vp); 412 else if (error == ENOENT) 413 printf("warning: no /dev/console\n"); 414 else 415 printf("warning: lookup /dev/console: error %d\n", error); 416 } 417 418 /* 419 * List of paths to try when searching for "init". 420 */ 421 static char *initpaths[] = { 422 "/sbin/init", 423 "/sbin/oinit", 424 "/sbin/init.bak", 425 NULL, 426 }; 427 428 /* 429 * Start the initial user process; try exec'ing each pathname in "initpaths". 430 * The program is invoked with one argument containing the boot flags. 431 */ 432 static void 433 start_init(p) 434 struct proc *p; 435 { 436 vm_offset_t addr; 437 struct sys_execve_args /* { 438 syscallarg(char *) path; 439 syscallarg(char * const *) argp; 440 syscallarg(char * const *) envp; 441 } */ args; 442 int options, i, error; 443 register_t retval[2]; 444 char flags[4], *flagsp; 445 char **pathp, *path, *ucp, **uap, *arg0, *arg1 = NULL; 446 447 /* 448 * Now in process 1. 449 */ 450 initproc = p; 451 452 #ifdef cpu_set_init_frame /* XXX should go away */ 453 /* 454 * We need to set the system call frame as if we were entered through 455 * a syscall() so that when we call sys_execve() below, it will be able 456 * to set the entry point (see setregs) when it tries to exec. The 457 * startup code in "locore.s" has allocated space for the frame and 458 * passed a pointer to that space as main's argument. 459 */ 460 cpu_set_init_frame(p, initframep); 461 #endif 462 463 /* 464 * This is not the right way to do this. We really should 465 * hand-craft a descriptor onto /dev/console to hand to init, 466 * but that's a _lot_ more work, and the benefit from this easy 467 * hack makes up for the "good is the enemy of the best" effect. 468 */ 469 check_console(p); 470 471 /* 472 * Need just enough stack to hold the faked-up "execve()" arguments. 473 */ 474 addr = USRSTACK - PAGE_SIZE; 475 if (vm_allocate(&p->p_vmspace->vm_map, &addr, (vm_size_t)PAGE_SIZE, 476 FALSE) != 0) 477 panic("init: couldn't allocate argument space"); 478 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 479 480 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 481 ucp = (char *)(addr + PAGE_SIZE); 482 483 /* 484 * Construct the boot flag argument. 485 */ 486 flagsp = flags; 487 *flagsp++ = '-'; 488 options = 0; 489 490 if (boothowto & RB_SINGLE) { 491 *flagsp++ = 's'; 492 options = 1; 493 } 494 #ifdef notyet 495 if (boothowto & RB_FASTBOOT) { 496 *flagsp++ = 'f'; 497 options = 1; 498 } 499 #endif 500 501 /* 502 * Move out the flags (arg 1), if necessary. 503 */ 504 if (options != 0) { 505 *flagsp++ = '\0'; 506 i = flagsp - flags; 507 #ifdef DEBUG 508 printf("init: copying out flags `%s' %d\n", flags, i); 509 #endif 510 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 511 arg1 = ucp; 512 } 513 514 /* 515 * Move out the file name (also arg 0). 516 */ 517 i = strlen(path) + 1; 518 #ifdef DEBUG 519 printf("init: copying out path `%s' %d\n", path, i); 520 #endif 521 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 522 arg0 = ucp; 523 524 /* 525 * Move out the arg pointers. 526 */ 527 uap = (char **)((long)ucp & ~ALIGNBYTES); 528 (void)suword((caddr_t)--uap, 0); /* terminator */ 529 if (options != 0) 530 (void)suword((caddr_t)--uap, (long)arg1); 531 (void)suword((caddr_t)--uap, (long)arg0); 532 533 /* 534 * Point at the arguments. 535 */ 536 SCARG(&args, path) = arg0; 537 SCARG(&args, argp) = uap; 538 SCARG(&args, envp) = NULL; 539 540 /* 541 * Now try to exec the program. If can't for any reason 542 * other than it doesn't exist, complain. 543 */ 544 error = sys_execve(p, &args, retval); 545 if (error == 0 || error == EJUSTRETURN) 546 return; 547 if (error != ENOENT) 548 printf("exec %s: error %d\n", path, error); 549 } 550 printf("init: not found\n"); 551 panic("no init"); 552 } 553 554 static void 555 start_pagedaemon(p) 556 struct proc *p; 557 { 558 559 /* 560 * Now in process 2. 561 */ 562 p->p_flag |= P_INMEM | P_SYSTEM; /* XXX */ 563 bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon")); 564 vm_pageout(); 565 /* NOTREACHED */ 566 } 567
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