init_main.c revision 1.98
1 /* $NetBSD: init_main.c,v 1.98 1997/03/26 22:38:45 gwr 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 /* Determine the root/swap/dump devices, etc. */ 323 cpu_rootconf(); 324 swapconf(); 325 cpu_dumpconf(); 326 327 /* Mount the root file system. */ 328 do { 329 domountroothook(); 330 if ((error = vfs_mountroot())) { 331 printf("cannot mount root, error = %d\n", error); 332 boothowto |= RB_ASKNAME; 333 setroot(root_device, 334 (rootdev != NODEV) ? DISKPART(rootdev) : 0, NULL); 335 } 336 } while (error != 0); 337 mountroothook_destroy(); 338 339 mountlist.cqh_first->mnt_flag |= MNT_ROOTFS; 340 mountlist.cqh_first->mnt_op->vfs_refcount++; 341 342 /* Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to reference it. */ 343 if (VFS_ROOT(mountlist.cqh_first, &rootvnode)) 344 panic("cannot find root vnode"); 345 filedesc0.fd_fd.fd_cdir = rootvnode; 346 VREF(filedesc0.fd_fd.fd_cdir); 347 VOP_UNLOCK(rootvnode); 348 filedesc0.fd_fd.fd_rdir = NULL; 349 swapinit(); 350 351 /* 352 * Now can look at time, having had a chance to verify the time 353 * from the file system. Reset p->p_rtime as it may have been 354 * munched in mi_switch() after the time got set. 355 */ 356 p->p_stats->p_start = runtime = mono_time = boottime = time; 357 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 358 359 /* Initialize signal state for process 0. */ 360 siginit(p); 361 362 /* Create process 1 (init(8)). */ 363 if (sys_fork(p, NULL, rval)) 364 panic("fork init"); 365 #ifdef cpu_set_init_frame /* XXX should go away */ 366 if (rval[1]) { 367 /* 368 * Now in process 1. 369 */ 370 initframep = framep; 371 start_init(curproc); 372 return; 373 } 374 #else 375 cpu_set_kpc(pfind(1), start_init); 376 #endif 377 378 /* Create process 2 (the pageout daemon). */ 379 if (sys_fork(p, NULL, rval)) 380 panic("fork pager"); 381 #ifdef cpu_set_init_frame /* XXX should go away */ 382 if (rval[1]) { 383 /* 384 * Now in process 2. 385 */ 386 start_pagedaemon(curproc); 387 } 388 #else 389 cpu_set_kpc(pfind(2), start_pagedaemon); 390 #endif 391 392 /* The scheduler is an infinite loop. */ 393 scheduler(); 394 /* NOTREACHED */ 395 } 396 397 static void 398 check_console(p) 399 struct proc *p; 400 { 401 struct nameidata nd; 402 int error; 403 404 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 405 error = namei(&nd); 406 if (error == 0) 407 vrele(nd.ni_vp); 408 else if (error == ENOENT) 409 printf("warning: no /dev/console\n"); 410 else 411 printf("warning: lookup /dev/console: error %d\n", error); 412 } 413 414 /* 415 * List of paths to try when searching for "init". 416 */ 417 static char *initpaths[] = { 418 "/sbin/init", 419 "/sbin/oinit", 420 "/sbin/init.bak", 421 NULL, 422 }; 423 424 /* 425 * Start the initial user process; try exec'ing each pathname in "initpaths". 426 * The program is invoked with one argument containing the boot flags. 427 */ 428 static void 429 start_init(p) 430 struct proc *p; 431 { 432 vm_offset_t addr; 433 struct sys_execve_args /* { 434 syscallarg(char *) path; 435 syscallarg(char * const *) argp; 436 syscallarg(char * const *) envp; 437 } */ args; 438 int options, i, error; 439 register_t retval[2]; 440 char flags[4], *flagsp; 441 char **pathp, *path, *ucp, **uap, *arg0, *arg1 = NULL; 442 443 /* 444 * Now in process 1. 445 */ 446 initproc = p; 447 448 #ifdef cpu_set_init_frame /* XXX should go away */ 449 /* 450 * We need to set the system call frame as if we were entered through 451 * a syscall() so that when we call sys_execve() below, it will be able 452 * to set the entry point (see setregs) when it tries to exec. The 453 * startup code in "locore.s" has allocated space for the frame and 454 * passed a pointer to that space as main's argument. 455 */ 456 cpu_set_init_frame(p, initframep); 457 #endif 458 459 /* 460 * This is not the right way to do this. We really should 461 * hand-craft a descriptor onto /dev/console to hand to init, 462 * but that's a _lot_ more work, and the benefit from this easy 463 * hack makes up for the "good is the enemy of the best" effect. 464 */ 465 check_console(p); 466 467 /* 468 * Need just enough stack to hold the faked-up "execve()" arguments. 469 */ 470 addr = USRSTACK - PAGE_SIZE; 471 if (vm_allocate(&p->p_vmspace->vm_map, &addr, (vm_size_t)PAGE_SIZE, 472 FALSE) != 0) 473 panic("init: couldn't allocate argument space"); 474 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 475 476 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 477 ucp = (char *)(addr + PAGE_SIZE); 478 479 /* 480 * Construct the boot flag argument. 481 */ 482 flagsp = flags; 483 *flagsp++ = '-'; 484 options = 0; 485 486 if (boothowto & RB_SINGLE) { 487 *flagsp++ = 's'; 488 options = 1; 489 } 490 #ifdef notyet 491 if (boothowto & RB_FASTBOOT) { 492 *flagsp++ = 'f'; 493 options = 1; 494 } 495 #endif 496 497 /* 498 * Move out the flags (arg 1), if necessary. 499 */ 500 if (options != 0) { 501 *flagsp++ = '\0'; 502 i = flagsp - flags; 503 #ifdef DEBUG 504 printf("init: copying out flags `%s' %d\n", flags, i); 505 #endif 506 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 507 arg1 = ucp; 508 } 509 510 /* 511 * Move out the file name (also arg 0). 512 */ 513 i = strlen(path) + 1; 514 #ifdef DEBUG 515 printf("init: copying out path `%s' %d\n", path, i); 516 #endif 517 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 518 arg0 = ucp; 519 520 /* 521 * Move out the arg pointers. 522 */ 523 uap = (char **)((long)ucp & ~ALIGNBYTES); 524 (void)suword((caddr_t)--uap, 0); /* terminator */ 525 if (options != 0) 526 (void)suword((caddr_t)--uap, (long)arg1); 527 (void)suword((caddr_t)--uap, (long)arg0); 528 529 /* 530 * Point at the arguments. 531 */ 532 SCARG(&args, path) = arg0; 533 SCARG(&args, argp) = uap; 534 SCARG(&args, envp) = NULL; 535 536 /* 537 * Now try to exec the program. If can't for any reason 538 * other than it doesn't exist, complain. 539 */ 540 if ((error = sys_execve(p, &args, retval)) == 0) 541 return; 542 if (error != ENOENT) 543 printf("exec %s: error %d\n", path, error); 544 } 545 printf("init: not found\n"); 546 panic("no init"); 547 } 548 549 static void 550 start_pagedaemon(p) 551 struct proc *p; 552 { 553 554 /* 555 * Now in process 2. 556 */ 557 pageproc = p; 558 p->p_flag |= P_INMEM | P_SYSTEM; /* XXX */ 559 bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon")); 560 vm_pageout(); 561 /* NOTREACHED */ 562 } 563
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