init_main.c revision 1.93
1 /* $NetBSD: init_main.c,v 1.93 1997/01/31 00:47:12 mouse 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/buf.h> 59 #ifdef REAL_CLISTS 60 #include <sys/clist.h> 61 #endif 62 #include <sys/device.h> 63 #include <sys/protosw.h> 64 #include <sys/reboot.h> 65 #include <sys/user.h> 66 #ifdef SYSVSHM 67 #include <sys/shm.h> 68 #endif 69 #ifdef SYSVSEM 70 #include <sys/sem.h> 71 #endif 72 #ifdef SYSVMSG 73 #include <sys/msg.h> 74 #endif 75 #include <sys/domain.h> 76 #include <sys/mbuf.h> 77 78 #include <sys/syscall.h> 79 #include <sys/syscallargs.h> 80 81 #include <ufs/ufs/quota.h> 82 83 #include <machine/cpu.h> 84 85 #include <vm/vm.h> 86 #include <vm/vm_pageout.h> 87 88 #include <net/if.h> 89 #include <net/raw_cb.h> 90 91 char copyright[] = 92 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n The Regents of the University of California. All rights reserved.\n\n"; 93 94 /* Components of the first process -- never freed. */ 95 struct session session0; 96 struct pgrp pgrp0; 97 struct proc proc0; 98 struct pcred cred0; 99 struct filedesc0 filedesc0; 100 struct plimit limit0; 101 struct vmspace vmspace0; 102 struct proc *curproc = &proc0; 103 struct proc *initproc, *pageproc; 104 105 int cmask = CMASK; 106 extern struct user *proc0paddr; 107 108 struct vnode *rootvp, *swapdev_vp; 109 int boothowto; 110 struct timeval boottime; 111 struct timeval runtime; 112 113 static void start_init __P((struct proc *)); 114 static void start_pagedaemon __P((struct proc *)); 115 void main __P((void *)); 116 117 #ifdef cpu_set_init_frame 118 void *initframep; /* XXX should go away */ 119 #endif 120 121 extern char sigcode[], esigcode[]; 122 #ifdef SYSCALL_DEBUG 123 extern char *syscallnames[]; 124 #endif 125 126 struct emul emul_netbsd = { 127 "netbsd", 128 NULL, 129 sendsig, 130 SYS_syscall, 131 SYS_MAXSYSCALL, 132 sysent, 133 #ifdef SYSCALL_DEBUG 134 syscallnames, 135 #else 136 NULL, 137 #endif 138 0, 139 copyargs, 140 setregs, 141 sigcode, 142 esigcode, 143 }; 144 145 /* 146 * System startup; initialize the world, create process 0, mount root 147 * filesystem, and fork to create init and pagedaemon. Most of the 148 * hard work is done in the lower-level initialization routines including 149 * startup(), which does memory initialization and autoconfiguration. 150 */ 151 void 152 main(framep) 153 void *framep; /* XXX should go away */ 154 { 155 register struct proc *p; 156 register struct pdevinit *pdev; 157 register int i; 158 int s; 159 register_t rval[2]; 160 extern int (*mountroot) __P((void)); 161 extern struct pdevinit pdevinit[]; 162 extern void roundrobin __P((void *)); 163 extern void schedcpu __P((void *)); 164 extern void disk_init __P((void)); 165 #if defined(NFSSERVER) || defined(NFSCLIENT) 166 extern void nfs_init __P((void)); 167 #endif 168 169 /* 170 * Initialize the current process pointer (curproc) before 171 * any possible traps/probes to simplify trap processing. 172 */ 173 p = &proc0; 174 curproc = p; 175 /* 176 * Attempt to find console and initialize 177 * in case of early panic or other messages. 178 */ 179 consinit(); 180 printf(copyright); 181 182 vm_mem_init(); 183 kmeminit(); 184 disk_init(); /* must come before autoconfiguration */ 185 tty_init(); /* initialise tty list */ 186 config_init(); /* init autoconfiguration data structures */ 187 cpu_startup(); 188 189 /* 190 * Initialize process and pgrp structures. 191 */ 192 procinit(); 193 194 /* 195 * Create process 0 (the swapper). 196 */ 197 LIST_INSERT_HEAD(&allproc, p, p_list); 198 p->p_pgrp = &pgrp0; 199 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 200 LIST_INIT(&pgrp0.pg_members); 201 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 202 203 pgrp0.pg_session = &session0; 204 session0.s_count = 1; 205 session0.s_leader = p; 206 207 p->p_flag = P_INMEM | P_SYSTEM; 208 p->p_stat = SRUN; 209 p->p_nice = NZERO; 210 p->p_emul = &emul_netbsd; 211 bcopy("swapper", p->p_comm, sizeof ("swapper")); 212 213 /* Create credentials. */ 214 cred0.p_refcnt = 1; 215 p->p_cred = &cred0; 216 p->p_ucred = crget(); 217 p->p_ucred->cr_ngroups = 1; /* group 0 */ 218 219 /* Create the file descriptor table. */ 220 p->p_fd = &filedesc0.fd_fd; 221 filedesc0.fd_fd.fd_refcnt = 1; 222 filedesc0.fd_fd.fd_cmask = cmask; 223 filedesc0.fd_fd.fd_ofiles = filedesc0.fd_dfiles; 224 filedesc0.fd_fd.fd_ofileflags = filedesc0.fd_dfileflags; 225 filedesc0.fd_fd.fd_nfiles = NDFILE; 226 227 /* Create the limits structures. */ 228 p->p_limit = &limit0; 229 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 230 limit0.pl_rlimit[i].rlim_cur = 231 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 232 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE; 233 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC; 234 i = ptoa(cnt.v_free_count); 235 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 236 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 237 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 238 limit0.p_refcnt = 1; 239 240 /* Allocate a prototype map so we have something to fork. */ 241 p->p_vmspace = &vmspace0; 242 vmspace0.vm_refcnt = 1; 243 pmap_pinit(&vmspace0.vm_pmap); 244 vm_map_init(&p->p_vmspace->vm_map, round_page(VM_MIN_ADDRESS), 245 trunc_page(VM_MAX_ADDRESS), TRUE); 246 vmspace0.vm_map.pmap = &vmspace0.vm_pmap; 247 p->p_addr = proc0paddr; /* XXX */ 248 249 /* 250 * We continue to place resource usage info and signal 251 * actions in the user struct so they're pageable. 252 */ 253 p->p_stats = &p->p_addr->u_stats; 254 p->p_sigacts = &p->p_addr->u_sigacts; 255 256 /* 257 * Charge root for one process. 258 */ 259 (void)chgproccnt(0, 1); 260 261 rqinit(); 262 263 /* Configure virtual memory system, set vm rlimits. */ 264 vm_init_limits(p); 265 266 /* Initialize the file systems. */ 267 #if defined(NFSSERVER) || defined(NFSCLIENT) 268 nfs_init(); /* initialize server/shared data */ 269 #endif 270 vfsinit(); 271 272 /* Start real time and statistics clocks. */ 273 initclocks(); 274 275 /* Initialize mbuf's. */ 276 mbinit(); 277 278 #ifdef REAL_CLISTS 279 /* Initialize clists. */ 280 clist_init(); 281 #endif 282 283 #ifdef SYSVSHM 284 /* Initialize System V style shared memory. */ 285 shminit(); 286 #endif 287 288 #ifdef SYSVSEM 289 /* Initialize System V style semaphores. */ 290 seminit(); 291 #endif 292 293 #ifdef SYSVMSG 294 /* Initialize System V style message queues. */ 295 msginit(); 296 #endif 297 298 /* Attach pseudo-devices. */ 299 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 300 (*pdev->pdev_attach)(pdev->pdev_count); 301 302 /* 303 * Initialize protocols. Block reception of incoming packets 304 * until everything is ready. 305 */ 306 s = splimp(); 307 ifinit(); 308 domaininit(); 309 splx(s); 310 311 #ifdef GPROF 312 /* Initialize kernel profiling. */ 313 kmstartup(); 314 #endif 315 316 /* Kick off timeout driven events by calling first time. */ 317 roundrobin(NULL); 318 schedcpu(NULL); 319 320 /* Mount the root file system. */ 321 if ((*mountroot)()) 322 panic("cannot mount root"); 323 mountlist.cqh_first->mnt_flag |= MNT_ROOTFS; 324 mountlist.cqh_first->mnt_op->vfs_refcount++; 325 326 /* Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to reference it. */ 327 if (VFS_ROOT(mountlist.cqh_first, &rootvnode)) 328 panic("cannot find root vnode"); 329 filedesc0.fd_fd.fd_cdir = rootvnode; 330 VREF(filedesc0.fd_fd.fd_cdir); 331 VOP_UNLOCK(rootvnode); 332 filedesc0.fd_fd.fd_rdir = NULL; 333 swapinit(); 334 335 /* 336 * Now can look at time, having had a chance to verify the time 337 * from the file system. Reset p->p_rtime as it may have been 338 * munched in mi_switch() after the time got set. 339 */ 340 p->p_stats->p_start = runtime = mono_time = boottime = time; 341 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 342 343 /* Initialize signal state for process 0. */ 344 siginit(p); 345 346 /* Create process 1 (init(8)). */ 347 if (sys_fork(p, NULL, rval)) 348 panic("fork init"); 349 #ifdef cpu_set_init_frame /* XXX should go away */ 350 if (rval[1]) { 351 /* 352 * Now in process 1. 353 */ 354 initframep = framep; 355 start_init(curproc); 356 return; 357 } 358 #else 359 cpu_set_kpc(pfind(1), start_init); 360 #endif 361 362 /* Create process 2 (the pageout daemon). */ 363 if (sys_fork(p, NULL, rval)) 364 panic("fork pager"); 365 #ifdef cpu_set_init_frame /* XXX should go away */ 366 if (rval[1]) { 367 /* 368 * Now in process 2. 369 */ 370 start_pagedaemon(curproc); 371 } 372 #else 373 cpu_set_kpc(pfind(2), start_pagedaemon); 374 #endif 375 376 /* The scheduler is an infinite loop. */ 377 scheduler(); 378 /* NOTREACHED */ 379 } 380 381 static void 382 check_console(p) 383 struct proc *p 384 { 385 struct nameidata nd; 386 int error; 387 388 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 389 error = namei(&nd); 390 if (error) 391 if (error == ENOENT) 392 printf("warning: no /dev/console\n"); 393 else 394 printf("warning: lookup /dev/console: error %d\n", error); 395 else 396 vrele(nd.ni_vp); 397 } 398 399 /* 400 * List of paths to try when searching for "init". 401 */ 402 static char *initpaths[] = { 403 "/sbin/init", 404 "/sbin/oinit", 405 "/sbin/init.bak", 406 NULL, 407 }; 408 409 /* 410 * Start the initial user process; try exec'ing each pathname in "initpaths". 411 * The program is invoked with one argument containing the boot flags. 412 */ 413 static void 414 start_init(p) 415 struct proc *p; 416 { 417 vm_offset_t addr; 418 struct sys_execve_args /* { 419 syscallarg(char *) path; 420 syscallarg(char * const *) argp; 421 syscallarg(char * const *) envp; 422 } */ args; 423 int options, i, error; 424 register_t retval[2]; 425 char flags[4], *flagsp; 426 char **pathp, *path, *ucp, **uap, *arg0, *arg1 = NULL; 427 428 /* 429 * Now in process 1. 430 */ 431 initproc = p; 432 433 #ifdef cpu_set_init_frame /* XXX should go away */ 434 /* 435 * We need to set the system call frame as if we were entered through 436 * a syscall() so that when we call sys_execve() below, it will be able 437 * to set the entry point (see setregs) when it tries to exec. The 438 * startup code in "locore.s" has allocated space for the frame and 439 * passed a pointer to that space as main's argument. 440 */ 441 cpu_set_init_frame(p, initframep); 442 #endif 443 444 /* 445 * This is not the right way to do this. We really should 446 * hand-craft a descriptor onto /dev/console to hand to init, 447 * but that's a _lot_ more work, and the benefit from this easy 448 * hack makes up for the "good is the enemy of the best" effect. 449 */ 450 check_console(p); 451 452 /* 453 * Need just enough stack to hold the faked-up "execve()" arguments. 454 */ 455 addr = USRSTACK - PAGE_SIZE; 456 if (vm_allocate(&p->p_vmspace->vm_map, &addr, (vm_size_t)PAGE_SIZE, 457 FALSE) != 0) 458 panic("init: couldn't allocate argument space"); 459 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 460 461 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 462 ucp = (char *)(addr + PAGE_SIZE); 463 464 /* 465 * Construct the boot flag argument. 466 */ 467 flagsp = flags; 468 *flagsp++ = '-'; 469 options = 0; 470 471 if (boothowto & RB_SINGLE) { 472 *flagsp++ = 's'; 473 options = 1; 474 } 475 #ifdef notyet 476 if (boothowto & RB_FASTBOOT) { 477 *flagsp++ = 'f'; 478 options = 1; 479 } 480 #endif 481 482 /* 483 * Move out the flags (arg 1), if necessary. 484 */ 485 if (options != 0) { 486 *flagsp++ = '\0'; 487 i = flagsp - flags; 488 #ifdef DEBUG 489 printf("init: copying out flags `%s' %d\n", flags, i); 490 #endif 491 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 492 arg1 = ucp; 493 } 494 495 /* 496 * Move out the file name (also arg 0). 497 */ 498 i = strlen(path) + 1; 499 #ifdef DEBUG 500 printf("init: copying out path `%s' %d\n", path, i); 501 #endif 502 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 503 arg0 = ucp; 504 505 /* 506 * Move out the arg pointers. 507 */ 508 uap = (char **)((long)ucp & ~ALIGNBYTES); 509 (void)suword((caddr_t)--uap, 0); /* terminator */ 510 if (options != 0) 511 (void)suword((caddr_t)--uap, (long)arg1); 512 (void)suword((caddr_t)--uap, (long)arg0); 513 514 /* 515 * Point at the arguments. 516 */ 517 SCARG(&args, path) = arg0; 518 SCARG(&args, argp) = uap; 519 SCARG(&args, envp) = NULL; 520 521 /* 522 * Now try to exec the program. If can't for any reason 523 * other than it doesn't exist, complain. 524 */ 525 if ((error = sys_execve(p, &args, retval)) == 0) 526 return; 527 if (error != ENOENT) 528 printf("exec %s: error %d\n", path, error); 529 } 530 printf("init: not found\n"); 531 panic("no init"); 532 } 533 534 static void 535 start_pagedaemon(p) 536 struct proc *p; 537 { 538 539 /* 540 * Now in process 2. 541 */ 542 pageproc = p; 543 p->p_flag |= P_INMEM | P_SYSTEM; /* XXX */ 544 bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon")); 545 vm_pageout(); 546 /* NOTREACHED */ 547 } 548
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