init_main.c revision 1.105
1 /* $NetBSD: init_main.c,v 1.105 1997/10/10 08:19:41 mycroft 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 <sys/param.h> 45 #include <sys/filedesc.h> 46 #include <sys/errno.h> 47 #include <sys/exec.h> 48 #include <sys/kernel.h> 49 #include <sys/mount.h> 50 #include <sys/map.h> 51 #include <sys/proc.h> 52 #include <sys/resourcevar.h> 53 #include <sys/signalvar.h> 54 #include <sys/systm.h> 55 #include <sys/vnode.h> 56 #include <sys/tty.h> 57 #include <sys/conf.h> 58 #include <sys/disklabel.h> 59 #include <sys/buf.h> 60 #ifdef REAL_CLISTS 61 #include <sys/clist.h> 62 #endif 63 #include <sys/device.h> 64 #include <sys/protosw.h> 65 #include <sys/reboot.h> 66 #include <sys/user.h> 67 #ifdef SYSVSHM 68 #include <sys/shm.h> 69 #endif 70 #ifdef SYSVSEM 71 #include <sys/sem.h> 72 #endif 73 #ifdef SYSVMSG 74 #include <sys/msg.h> 75 #endif 76 #include <sys/domain.h> 77 #include <sys/mbuf.h> 78 #include <sys/namei.h> 79 #include <sys/rnd.h> 80 81 #include <sys/syscall.h> 82 #include <sys/syscallargs.h> 83 84 #include <ufs/ufs/quota.h> 85 86 #include <machine/cpu.h> 87 88 #include <vm/vm.h> 89 #include <vm/vm_pageout.h> 90 91 #include <net/if.h> 92 #include <net/raw_cb.h> 93 94 char copyright[] = 95 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n The Regents of the University of California. All rights reserved.\n\n"; 96 97 /* Components of the first process -- never freed. */ 98 struct session session0; 99 struct pgrp pgrp0; 100 struct proc proc0; 101 struct pcred cred0; 102 struct filedesc0 filedesc0; 103 struct plimit limit0; 104 struct vmspace vmspace0; 105 struct proc *curproc = &proc0; 106 struct proc *initproc; 107 108 int cmask = CMASK; 109 extern struct user *proc0paddr; 110 111 struct vnode *rootvp, *swapdev_vp; 112 int boothowto; 113 struct timeval boottime; 114 struct timeval runtime; 115 116 static void check_console __P((struct proc *p)); 117 static void start_init __P((struct proc *)); 118 static void start_pagedaemon __P((struct proc *)); 119 void main __P((void *)); 120 121 #ifdef cpu_set_init_frame 122 void *initframep; /* XXX should go away */ 123 #endif 124 125 extern char sigcode[], esigcode[]; 126 #ifdef SYSCALL_DEBUG 127 extern char *syscallnames[]; 128 #endif 129 130 struct emul emul_netbsd = { 131 "netbsd", 132 NULL, 133 sendsig, 134 SYS_syscall, 135 SYS_MAXSYSCALL, 136 sysent, 137 #ifdef SYSCALL_DEBUG 138 syscallnames, 139 #else 140 NULL, 141 #endif 142 0, 143 copyargs, 144 setregs, 145 sigcode, 146 esigcode, 147 }; 148 149 /* 150 * System startup; initialize the world, create process 0, mount root 151 * filesystem, and fork to create init and pagedaemon. Most of the 152 * hard work is done in the lower-level initialization routines including 153 * startup(), which does memory initialization and autoconfiguration. 154 */ 155 void 156 main(framep) 157 void *framep; /* XXX should go away */ 158 { 159 register struct proc *p; 160 register struct pdevinit *pdev; 161 register int i; 162 int s, error; 163 register_t rval[2]; 164 extern struct pdevinit pdevinit[]; 165 extern void roundrobin __P((void *)); 166 extern void schedcpu __P((void *)); 167 extern void disk_init __P((void)); 168 #if defined(NFSSERVER) || defined(NFS) 169 extern void nfs_init __P((void)); 170 #endif 171 172 /* 173 * Initialize the current process pointer (curproc) before 174 * any possible traps/probes to simplify trap processing. 175 */ 176 p = &proc0; 177 curproc = p; 178 /* 179 * Attempt to find console and initialize 180 * in case of early panic or other messages. 181 */ 182 consinit(); 183 printf(copyright); 184 185 vm_mem_init(); 186 kmeminit(); 187 disk_init(); /* must come before autoconfiguration */ 188 tty_init(); /* initialise tty list */ 189 rnd_init(); 190 config_init(); /* init autoconfiguration data structures */ 191 cpu_startup(); 192 193 /* 194 * Initialize process and pgrp structures. 195 */ 196 procinit(); 197 198 /* 199 * Create process 0 (the swapper). 200 */ 201 LIST_INSERT_HEAD(&allproc, p, p_list); 202 p->p_pgrp = &pgrp0; 203 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 204 LIST_INIT(&pgrp0.pg_members); 205 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 206 207 pgrp0.pg_session = &session0; 208 session0.s_count = 1; 209 session0.s_leader = p; 210 211 p->p_flag = P_INMEM | P_SYSTEM; 212 p->p_stat = SRUN; 213 p->p_nice = NZERO; 214 p->p_emul = &emul_netbsd; 215 bcopy("swapper", p->p_comm, sizeof ("swapper")); 216 217 /* Create credentials. */ 218 cred0.p_refcnt = 1; 219 p->p_cred = &cred0; 220 p->p_ucred = crget(); 221 p->p_ucred->cr_ngroups = 1; /* group 0 */ 222 223 /* Create the file descriptor table. */ 224 p->p_fd = &filedesc0.fd_fd; 225 filedesc0.fd_fd.fd_refcnt = 1; 226 filedesc0.fd_fd.fd_cmask = cmask; 227 filedesc0.fd_fd.fd_ofiles = filedesc0.fd_dfiles; 228 filedesc0.fd_fd.fd_ofileflags = filedesc0.fd_dfileflags; 229 filedesc0.fd_fd.fd_nfiles = NDFILE; 230 231 /* Create the limits structures. */ 232 p->p_limit = &limit0; 233 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 234 limit0.pl_rlimit[i].rlim_cur = 235 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 236 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE; 237 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC; 238 i = ptoa(cnt.v_free_count); 239 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 240 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 241 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 242 limit0.p_refcnt = 1; 243 244 /* Allocate a prototype map so we have something to fork. */ 245 p->p_vmspace = vmspace_alloc(round_page(VM_MIN_ADDRESS), 246 trunc_page(VM_MAX_ADDRESS), TRUE); 247 248 p->p_addr = proc0paddr; /* XXX */ 249 250 /* 251 * We continue to place resource usage info and signal 252 * actions in the user struct so they're pageable. 253 */ 254 p->p_stats = &p->p_addr->u_stats; 255 p->p_sigacts = &p->p_addr->u_sigacts; 256 257 /* 258 * Charge root for one process. 259 */ 260 (void)chgproccnt(0, 1); 261 262 rqinit(); 263 264 /* Configure virtual memory system, set vm rlimits. */ 265 vm_init_limits(p); 266 267 /* Initialize the file systems. */ 268 #if defined(NFSSERVER) || defined(NFS) 269 nfs_init(); /* initialize server/shared data */ 270 #endif 271 vfsinit(); 272 273 /* Start real time and statistics clocks. */ 274 initclocks(); 275 276 /* Initialize mbuf's. */ 277 mbinit(); 278 279 #ifdef REAL_CLISTS 280 /* Initialize clists. */ 281 clist_init(); 282 #endif 283 284 #ifdef SYSVSHM 285 /* Initialize System V style shared memory. */ 286 shminit(); 287 #endif 288 289 #ifdef SYSVSEM 290 /* Initialize System V style semaphores. */ 291 seminit(); 292 #endif 293 294 #ifdef SYSVMSG 295 /* Initialize System V style message queues. */ 296 msginit(); 297 #endif 298 299 /* Attach pseudo-devices. */ 300 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 301 (*pdev->pdev_attach)(pdev->pdev_count); 302 303 /* 304 * Initialize protocols. Block reception of incoming packets 305 * until everything is ready. 306 */ 307 s = splimp(); 308 ifinit(); 309 domaininit(); 310 splx(s); 311 312 #ifdef GPROF 313 /* Initialize kernel profiling. */ 314 kmstartup(); 315 #endif 316 317 /* Kick off timeout driven events by calling first time. */ 318 roundrobin(NULL); 319 schedcpu(NULL); 320 321 /* Determine the root and dump devices. */ 322 cpu_rootconf(); 323 cpu_dumpconf(); 324 325 /* Mount the root file system. */ 326 do { 327 domountroothook(); 328 if ((error = vfs_mountroot())) { 329 printf("cannot mount root, error = %d\n", error); 330 boothowto |= RB_ASKNAME; 331 setroot(root_device, 332 (rootdev != NODEV) ? DISKPART(rootdev) : 0, NULL); 333 } 334 } while (error != 0); 335 mountroothook_destroy(); 336 337 mountlist.cqh_first->mnt_flag |= MNT_ROOTFS; 338 mountlist.cqh_first->mnt_op->vfs_refcount++; 339 340 /* Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to reference it. */ 341 if (VFS_ROOT(mountlist.cqh_first, &rootvnode)) 342 panic("cannot find root vnode"); 343 filedesc0.fd_fd.fd_cdir = rootvnode; 344 VREF(filedesc0.fd_fd.fd_cdir); 345 VOP_UNLOCK(rootvnode); 346 filedesc0.fd_fd.fd_rdir = NULL; 347 swapinit(); 348 349 /* 350 * Now can look at time, having had a chance to verify the time 351 * from the file system. Reset p->p_rtime as it may have been 352 * munched in mi_switch() after the time got set. 353 */ 354 p->p_stats->p_start = runtime = mono_time = boottime = time; 355 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 356 357 /* Initialize signal state for process 0. */ 358 siginit(p); 359 360 /* Create process 1 (init(8)). */ 361 if (sys_fork(p, NULL, rval)) 362 panic("fork init"); 363 #ifdef cpu_set_init_frame /* XXX should go away */ 364 if (rval[1]) { 365 /* 366 * Now in process 1. 367 */ 368 initframep = framep; 369 start_init(curproc); 370 return; 371 } 372 #else 373 cpu_set_kpc(pfind(1), start_init); 374 #endif 375 376 /* Create process 2 (the pageout daemon). */ 377 if (sys_fork(p, NULL, rval)) 378 panic("fork pager"); 379 #ifdef cpu_set_init_frame /* XXX should go away */ 380 if (rval[1]) { 381 /* 382 * Now in process 2. 383 */ 384 start_pagedaemon(curproc); 385 } 386 #else 387 cpu_set_kpc(pfind(2), start_pagedaemon); 388 #endif 389 390 /* The scheduler is an infinite loop. */ 391 scheduler(); 392 /* NOTREACHED */ 393 } 394 395 static void 396 check_console(p) 397 struct proc *p; 398 { 399 struct nameidata nd; 400 int error; 401 402 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 403 error = namei(&nd); 404 if (error == 0) 405 vrele(nd.ni_vp); 406 else if (error == ENOENT) 407 printf("warning: no /dev/console\n"); 408 else 409 printf("warning: lookup /dev/console: error %d\n", error); 410 } 411 412 /* 413 * List of paths to try when searching for "init". 414 */ 415 static char *initpaths[] = { 416 "/sbin/init", 417 "/sbin/oinit", 418 "/sbin/init.bak", 419 NULL, 420 }; 421 422 /* 423 * Start the initial user process; try exec'ing each pathname in "initpaths". 424 * The program is invoked with one argument containing the boot flags. 425 */ 426 static void 427 start_init(p) 428 struct proc *p; 429 { 430 vm_offset_t addr; 431 struct sys_execve_args /* { 432 syscallarg(char *) path; 433 syscallarg(char * const *) argp; 434 syscallarg(char * const *) envp; 435 } */ args; 436 int options, i, error; 437 register_t retval[2]; 438 char flags[4], *flagsp; 439 char **pathp, *path, *ucp, **uap, *arg0, *arg1 = NULL; 440 441 /* 442 * Now in process 1. 443 */ 444 initproc = p; 445 446 #ifdef cpu_set_init_frame /* XXX should go away */ 447 /* 448 * We need to set the system call frame as if we were entered through 449 * a syscall() so that when we call sys_execve() below, it will be able 450 * to set the entry point (see setregs) when it tries to exec. The 451 * startup code in "locore.s" has allocated space for the frame and 452 * passed a pointer to that space as main's argument. 453 */ 454 cpu_set_init_frame(p, initframep); 455 #endif 456 457 /* 458 * This is not the right way to do this. We really should 459 * hand-craft a descriptor onto /dev/console to hand to init, 460 * but that's a _lot_ more work, and the benefit from this easy 461 * hack makes up for the "good is the enemy of the best" effect. 462 */ 463 check_console(p); 464 465 /* 466 * Need just enough stack to hold the faked-up "execve()" arguments. 467 */ 468 addr = USRSTACK - PAGE_SIZE; 469 if (vm_allocate(&p->p_vmspace->vm_map, &addr, (vm_size_t)PAGE_SIZE, 470 FALSE) != 0) 471 panic("init: couldn't allocate argument space"); 472 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 473 474 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 475 ucp = (char *)(addr + PAGE_SIZE); 476 477 /* 478 * Construct the boot flag argument. 479 */ 480 flagsp = flags; 481 *flagsp++ = '-'; 482 options = 0; 483 484 if (boothowto & RB_SINGLE) { 485 *flagsp++ = 's'; 486 options = 1; 487 } 488 #ifdef notyet 489 if (boothowto & RB_FASTBOOT) { 490 *flagsp++ = 'f'; 491 options = 1; 492 } 493 #endif 494 495 /* 496 * Move out the flags (arg 1), if necessary. 497 */ 498 if (options != 0) { 499 *flagsp++ = '\0'; 500 i = flagsp - flags; 501 #ifdef DEBUG 502 printf("init: copying out flags `%s' %d\n", flags, i); 503 #endif 504 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 505 arg1 = ucp; 506 } 507 508 /* 509 * Move out the file name (also arg 0). 510 */ 511 i = strlen(path) + 1; 512 #ifdef DEBUG 513 printf("init: copying out path `%s' %d\n", path, i); 514 #endif 515 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 516 arg0 = ucp; 517 518 /* 519 * Move out the arg pointers. 520 */ 521 uap = (char **)((long)ucp & ~ALIGNBYTES); 522 (void)suword((caddr_t)--uap, 0); /* terminator */ 523 if (options != 0) 524 (void)suword((caddr_t)--uap, (long)arg1); 525 (void)suword((caddr_t)--uap, (long)arg0); 526 527 /* 528 * Point at the arguments. 529 */ 530 SCARG(&args, path) = arg0; 531 SCARG(&args, argp) = uap; 532 SCARG(&args, envp) = NULL; 533 534 /* 535 * Now try to exec the program. If can't for any reason 536 * other than it doesn't exist, complain. 537 */ 538 error = sys_execve(p, &args, retval); 539 if (error == 0 || error == EJUSTRETURN) 540 return; 541 if (error != ENOENT) 542 printf("exec %s: error %d\n", path, error); 543 } 544 printf("init: not found\n"); 545 panic("no init"); 546 } 547 548 static void 549 start_pagedaemon(p) 550 struct proc *p; 551 { 552 553 /* 554 * Now in process 2. 555 */ 556 p->p_flag |= P_INMEM | P_SYSTEM; /* XXX */ 557 bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon")); 558 vm_pageout(); 559 /* NOTREACHED */ 560 } 561
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