init_main.c revision 1.97
1 /* $NetBSD: init_main.c,v 1.97 1997/02/02 02:55:06 thorpej 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 80 #include <sys/syscall.h> 81 #include <sys/syscallargs.h> 82 83 #include <ufs/ufs/quota.h> 84 85 #include <machine/cpu.h> 86 87 #include <vm/vm.h> 88 #include <vm/vm_pageout.h> 89 90 #include <net/if.h> 91 #include <net/raw_cb.h> 92 93 char copyright[] = 94 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n The Regents of the University of California. All rights reserved.\n\n"; 95 96 /* Components of the first process -- never freed. */ 97 struct session session0; 98 struct pgrp pgrp0; 99 struct proc proc0; 100 struct pcred cred0; 101 struct filedesc0 filedesc0; 102 struct plimit limit0; 103 struct vmspace vmspace0; 104 struct proc *curproc = &proc0; 105 struct proc *initproc, *pageproc; 106 107 int cmask = CMASK; 108 extern struct user *proc0paddr; 109 110 struct vnode *rootvp, *swapdev_vp; 111 int boothowto; 112 struct timeval boottime; 113 struct timeval runtime; 114 115 static void check_console __P((struct proc *p)); 116 static void start_init __P((struct proc *)); 117 static void start_pagedaemon __P((struct proc *)); 118 void main __P((void *)); 119 120 #ifdef cpu_set_init_frame 121 void *initframep; /* XXX should go away */ 122 #endif 123 124 extern char sigcode[], esigcode[]; 125 #ifdef SYSCALL_DEBUG 126 extern char *syscallnames[]; 127 #endif 128 129 struct emul emul_netbsd = { 130 "netbsd", 131 NULL, 132 sendsig, 133 SYS_syscall, 134 SYS_MAXSYSCALL, 135 sysent, 136 #ifdef SYSCALL_DEBUG 137 syscallnames, 138 #else 139 NULL, 140 #endif 141 0, 142 copyargs, 143 setregs, 144 sigcode, 145 esigcode, 146 }; 147 148 /* 149 * System startup; initialize the world, create process 0, mount root 150 * filesystem, and fork to create init and pagedaemon. Most of the 151 * hard work is done in the lower-level initialization routines including 152 * startup(), which does memory initialization and autoconfiguration. 153 */ 154 void 155 main(framep) 156 void *framep; /* XXX should go away */ 157 { 158 register struct proc *p; 159 register struct pdevinit *pdev; 160 register int i; 161 int s, error; 162 register_t rval[2]; 163 extern struct pdevinit pdevinit[]; 164 extern void roundrobin __P((void *)); 165 extern void schedcpu __P((void *)); 166 extern void disk_init __P((void)); 167 #if defined(NFSSERVER) || defined(NFS) 168 extern void nfs_init __P((void)); 169 #endif 170 171 /* 172 * Initialize the current process pointer (curproc) before 173 * any possible traps/probes to simplify trap processing. 174 */ 175 p = &proc0; 176 curproc = p; 177 /* 178 * Attempt to find console and initialize 179 * in case of early panic or other messages. 180 */ 181 consinit(); 182 printf(copyright); 183 184 vm_mem_init(); 185 kmeminit(); 186 disk_init(); /* must come before autoconfiguration */ 187 tty_init(); /* initialise tty list */ 188 config_init(); /* init autoconfiguration data structures */ 189 cpu_startup(); 190 191 /* 192 * Initialize process and pgrp structures. 193 */ 194 procinit(); 195 196 /* 197 * Create process 0 (the swapper). 198 */ 199 LIST_INSERT_HEAD(&allproc, p, p_list); 200 p->p_pgrp = &pgrp0; 201 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 202 LIST_INIT(&pgrp0.pg_members); 203 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 204 205 pgrp0.pg_session = &session0; 206 session0.s_count = 1; 207 session0.s_leader = p; 208 209 p->p_flag = P_INMEM | P_SYSTEM; 210 p->p_stat = SRUN; 211 p->p_nice = NZERO; 212 p->p_emul = &emul_netbsd; 213 bcopy("swapper", p->p_comm, sizeof ("swapper")); 214 215 /* Create credentials. */ 216 cred0.p_refcnt = 1; 217 p->p_cred = &cred0; 218 p->p_ucred = crget(); 219 p->p_ucred->cr_ngroups = 1; /* group 0 */ 220 221 /* Create the file descriptor table. */ 222 p->p_fd = &filedesc0.fd_fd; 223 filedesc0.fd_fd.fd_refcnt = 1; 224 filedesc0.fd_fd.fd_cmask = cmask; 225 filedesc0.fd_fd.fd_ofiles = filedesc0.fd_dfiles; 226 filedesc0.fd_fd.fd_ofileflags = filedesc0.fd_dfileflags; 227 filedesc0.fd_fd.fd_nfiles = NDFILE; 228 229 /* Create the limits structures. */ 230 p->p_limit = &limit0; 231 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 232 limit0.pl_rlimit[i].rlim_cur = 233 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 234 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE; 235 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC; 236 i = ptoa(cnt.v_free_count); 237 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 238 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 239 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 240 limit0.p_refcnt = 1; 241 242 /* Allocate a prototype map so we have something to fork. */ 243 p->p_vmspace = &vmspace0; 244 vmspace0.vm_refcnt = 1; 245 pmap_pinit(&vmspace0.vm_pmap); 246 vm_map_init(&p->p_vmspace->vm_map, round_page(VM_MIN_ADDRESS), 247 trunc_page(VM_MAX_ADDRESS), TRUE); 248 vmspace0.vm_map.pmap = &vmspace0.vm_pmap; 249 p->p_addr = proc0paddr; /* XXX */ 250 251 /* 252 * We continue to place resource usage info and signal 253 * actions in the user struct so they're pageable. 254 */ 255 p->p_stats = &p->p_addr->u_stats; 256 p->p_sigacts = &p->p_addr->u_sigacts; 257 258 /* 259 * Charge root for one process. 260 */ 261 (void)chgproccnt(0, 1); 262 263 rqinit(); 264 265 /* Configure virtual memory system, set vm rlimits. */ 266 vm_init_limits(p); 267 268 /* Initialize the file systems. */ 269 #if defined(NFSSERVER) || defined(NFS) 270 nfs_init(); /* initialize server/shared data */ 271 #endif 272 vfsinit(); 273 274 /* Start real time and statistics clocks. */ 275 initclocks(); 276 277 /* Initialize mbuf's. */ 278 mbinit(); 279 280 #ifdef REAL_CLISTS 281 /* Initialize clists. */ 282 clist_init(); 283 #endif 284 285 #ifdef SYSVSHM 286 /* Initialize System V style shared memory. */ 287 shminit(); 288 #endif 289 290 #ifdef SYSVSEM 291 /* Initialize System V style semaphores. */ 292 seminit(); 293 #endif 294 295 #ifdef SYSVMSG 296 /* Initialize System V style message queues. */ 297 msginit(); 298 #endif 299 300 /* Attach pseudo-devices. */ 301 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 302 (*pdev->pdev_attach)(pdev->pdev_count); 303 304 /* 305 * Initialize protocols. Block reception of incoming packets 306 * until everything is ready. 307 */ 308 s = splimp(); 309 ifinit(); 310 domaininit(); 311 splx(s); 312 313 #ifdef GPROF 314 /* Initialize kernel profiling. */ 315 kmstartup(); 316 #endif 317 318 /* Kick off timeout driven events by calling first time. */ 319 roundrobin(NULL); 320 schedcpu(NULL); 321 322 /* Mount the root file system. */ 323 do { 324 domountroothook(); 325 if ((error = vfs_mountroot())) { 326 printf("cannot mount root, error = %d\n", error); 327 boothowto |= RB_ASKNAME; 328 setroot(root_device, 329 (rootdev != NODEV) ? DISKPART(rootdev) : 0, NULL); 330 } 331 } while (error != 0); 332 mountroothook_destroy(); 333 334 mountlist.cqh_first->mnt_flag |= MNT_ROOTFS; 335 mountlist.cqh_first->mnt_op->vfs_refcount++; 336 337 /* Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to reference it. */ 338 if (VFS_ROOT(mountlist.cqh_first, &rootvnode)) 339 panic("cannot find root vnode"); 340 filedesc0.fd_fd.fd_cdir = rootvnode; 341 VREF(filedesc0.fd_fd.fd_cdir); 342 VOP_UNLOCK(rootvnode); 343 filedesc0.fd_fd.fd_rdir = NULL; 344 swapinit(); 345 346 /* 347 * Now can look at time, having had a chance to verify the time 348 * from the file system. Reset p->p_rtime as it may have been 349 * munched in mi_switch() after the time got set. 350 */ 351 p->p_stats->p_start = runtime = mono_time = boottime = time; 352 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 353 354 /* Initialize signal state for process 0. */ 355 siginit(p); 356 357 /* Create process 1 (init(8)). */ 358 if (sys_fork(p, NULL, rval)) 359 panic("fork init"); 360 #ifdef cpu_set_init_frame /* XXX should go away */ 361 if (rval[1]) { 362 /* 363 * Now in process 1. 364 */ 365 initframep = framep; 366 start_init(curproc); 367 return; 368 } 369 #else 370 cpu_set_kpc(pfind(1), start_init); 371 #endif 372 373 /* Create process 2 (the pageout daemon). */ 374 if (sys_fork(p, NULL, rval)) 375 panic("fork pager"); 376 #ifdef cpu_set_init_frame /* XXX should go away */ 377 if (rval[1]) { 378 /* 379 * Now in process 2. 380 */ 381 start_pagedaemon(curproc); 382 } 383 #else 384 cpu_set_kpc(pfind(2), start_pagedaemon); 385 #endif 386 387 /* The scheduler is an infinite loop. */ 388 scheduler(); 389 /* NOTREACHED */ 390 } 391 392 static void 393 check_console(p) 394 struct proc *p; 395 { 396 struct nameidata nd; 397 int error; 398 399 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 400 error = namei(&nd); 401 if (error == 0) 402 vrele(nd.ni_vp); 403 else if (error == ENOENT) 404 printf("warning: no /dev/console\n"); 405 else 406 printf("warning: lookup /dev/console: error %d\n", error); 407 } 408 409 /* 410 * List of paths to try when searching for "init". 411 */ 412 static char *initpaths[] = { 413 "/sbin/init", 414 "/sbin/oinit", 415 "/sbin/init.bak", 416 NULL, 417 }; 418 419 /* 420 * Start the initial user process; try exec'ing each pathname in "initpaths". 421 * The program is invoked with one argument containing the boot flags. 422 */ 423 static void 424 start_init(p) 425 struct proc *p; 426 { 427 vm_offset_t addr; 428 struct sys_execve_args /* { 429 syscallarg(char *) path; 430 syscallarg(char * const *) argp; 431 syscallarg(char * const *) envp; 432 } */ args; 433 int options, i, error; 434 register_t retval[2]; 435 char flags[4], *flagsp; 436 char **pathp, *path, *ucp, **uap, *arg0, *arg1 = NULL; 437 438 /* 439 * Now in process 1. 440 */ 441 initproc = p; 442 443 #ifdef cpu_set_init_frame /* XXX should go away */ 444 /* 445 * We need to set the system call frame as if we were entered through 446 * a syscall() so that when we call sys_execve() below, it will be able 447 * to set the entry point (see setregs) when it tries to exec. The 448 * startup code in "locore.s" has allocated space for the frame and 449 * passed a pointer to that space as main's argument. 450 */ 451 cpu_set_init_frame(p, initframep); 452 #endif 453 454 /* 455 * This is not the right way to do this. We really should 456 * hand-craft a descriptor onto /dev/console to hand to init, 457 * but that's a _lot_ more work, and the benefit from this easy 458 * hack makes up for the "good is the enemy of the best" effect. 459 */ 460 check_console(p); 461 462 /* 463 * Need just enough stack to hold the faked-up "execve()" arguments. 464 */ 465 addr = USRSTACK - PAGE_SIZE; 466 if (vm_allocate(&p->p_vmspace->vm_map, &addr, (vm_size_t)PAGE_SIZE, 467 FALSE) != 0) 468 panic("init: couldn't allocate argument space"); 469 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 470 471 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 472 ucp = (char *)(addr + PAGE_SIZE); 473 474 /* 475 * Construct the boot flag argument. 476 */ 477 flagsp = flags; 478 *flagsp++ = '-'; 479 options = 0; 480 481 if (boothowto & RB_SINGLE) { 482 *flagsp++ = 's'; 483 options = 1; 484 } 485 #ifdef notyet 486 if (boothowto & RB_FASTBOOT) { 487 *flagsp++ = 'f'; 488 options = 1; 489 } 490 #endif 491 492 /* 493 * Move out the flags (arg 1), if necessary. 494 */ 495 if (options != 0) { 496 *flagsp++ = '\0'; 497 i = flagsp - flags; 498 #ifdef DEBUG 499 printf("init: copying out flags `%s' %d\n", flags, i); 500 #endif 501 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 502 arg1 = ucp; 503 } 504 505 /* 506 * Move out the file name (also arg 0). 507 */ 508 i = strlen(path) + 1; 509 #ifdef DEBUG 510 printf("init: copying out path `%s' %d\n", path, i); 511 #endif 512 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 513 arg0 = ucp; 514 515 /* 516 * Move out the arg pointers. 517 */ 518 uap = (char **)((long)ucp & ~ALIGNBYTES); 519 (void)suword((caddr_t)--uap, 0); /* terminator */ 520 if (options != 0) 521 (void)suword((caddr_t)--uap, (long)arg1); 522 (void)suword((caddr_t)--uap, (long)arg0); 523 524 /* 525 * Point at the arguments. 526 */ 527 SCARG(&args, path) = arg0; 528 SCARG(&args, argp) = uap; 529 SCARG(&args, envp) = NULL; 530 531 /* 532 * Now try to exec the program. If can't for any reason 533 * other than it doesn't exist, complain. 534 */ 535 if ((error = sys_execve(p, &args, retval)) == 0) 536 return; 537 if (error != ENOENT) 538 printf("exec %s: error %d\n", path, error); 539 } 540 printf("init: not found\n"); 541 panic("no init"); 542 } 543 544 static void 545 start_pagedaemon(p) 546 struct proc *p; 547 { 548 549 /* 550 * Now in process 2. 551 */ 552 pageproc = p; 553 p->p_flag |= P_INMEM | P_SYSTEM; /* XXX */ 554 bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon")); 555 vm_pageout(); 556 /* NOTREACHED */ 557 } 558
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