init_main.c revision 1.115
1 /* $NetBSD: init_main.c,v 1.115 1998/02/10 14:09:22 mrg 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 "opt_uvm.h" 45 46 #include "rnd.h" 47 48 #include <sys/param.h> 49 #include <sys/filedesc.h> 50 #include <sys/errno.h> 51 #include <sys/exec.h> 52 #include <sys/kernel.h> 53 #include <sys/mount.h> 54 #include <sys/map.h> 55 #include <sys/proc.h> 56 #include <sys/resourcevar.h> 57 #include <sys/signalvar.h> 58 #include <sys/systm.h> 59 #include <sys/vnode.h> 60 #include <sys/tty.h> 61 #include <sys/conf.h> 62 #include <sys/disklabel.h> 63 #include <sys/buf.h> 64 #ifdef REAL_CLISTS 65 #include <sys/clist.h> 66 #endif 67 #include <sys/device.h> 68 #include <sys/protosw.h> 69 #include <sys/reboot.h> 70 #include <sys/user.h> 71 #ifdef SYSVSHM 72 #include <sys/shm.h> 73 #endif 74 #ifdef SYSVSEM 75 #include <sys/sem.h> 76 #endif 77 #ifdef SYSVMSG 78 #include <sys/msg.h> 79 #endif 80 #include <sys/domain.h> 81 #include <sys/mbuf.h> 82 #include <sys/namei.h> 83 #if NRND > 0 84 #include <sys/rnd.h> 85 #endif 86 87 #include <sys/syscall.h> 88 #include <sys/syscallargs.h> 89 90 #include <ufs/ufs/quota.h> 91 92 #include <machine/cpu.h> 93 94 #include <vm/vm.h> 95 #include <vm/vm_pageout.h> 96 97 #if defined(UVM) 98 #include <uvm/uvm.h> 99 #endif 100 101 #include <net/if.h> 102 #include <net/raw_cb.h> 103 104 char copyright[] = "\ 105 Copyright (c) 1996, 1997, 1998 106 The NetBSD Foundation, Inc. All rights reserved. 107 Copyright (c) 1982, 1986, 1989, 1991, 1993 108 The Regents of the University of California. All rights reserved. 109 110 "; 111 112 /* Components of the first process -- never freed. */ 113 struct session session0; 114 struct pgrp pgrp0; 115 struct proc proc0; 116 struct pcred cred0; 117 struct filedesc0 filedesc0; 118 struct plimit limit0; 119 struct vmspace vmspace0; 120 struct proc *curproc = &proc0; 121 struct proc *initproc; 122 123 int cmask = CMASK; 124 extern struct user *proc0paddr; 125 126 struct vnode *rootvp, *swapdev_vp; 127 int boothowto; 128 struct timeval boottime; 129 struct timeval runtime; 130 131 static void check_console __P((struct proc *p)); 132 static void start_init __P((struct proc *)); 133 static void start_pagedaemon __P((struct proc *)); 134 void main __P((void *)); 135 136 extern char sigcode[], esigcode[]; 137 #ifdef SYSCALL_DEBUG 138 extern char *syscallnames[]; 139 #endif 140 141 struct emul emul_netbsd = { 142 "netbsd", 143 NULL, 144 sendsig, 145 SYS_syscall, 146 SYS_MAXSYSCALL, 147 sysent, 148 #ifdef SYSCALL_DEBUG 149 syscallnames, 150 #else 151 NULL, 152 #endif 153 0, 154 copyargs, 155 setregs, 156 sigcode, 157 esigcode, 158 }; 159 160 /* 161 * System startup; initialize the world, create process 0, mount root 162 * filesystem, and fork to create init and pagedaemon. Most of the 163 * hard work is done in the lower-level initialization routines including 164 * startup(), which does memory initialization and autoconfiguration. 165 */ 166 void 167 main(framep) 168 void *framep; /* XXX should go away */ 169 { 170 struct proc *p, *p2; 171 struct pdevinit *pdev; 172 int i, s, error; 173 extern struct pdevinit pdevinit[]; 174 extern void roundrobin __P((void *)); 175 extern void schedcpu __P((void *)); 176 extern void disk_init __P((void)); 177 #if defined(NFSSERVER) || defined(NFS) 178 extern void nfs_init __P((void)); 179 #endif 180 181 /* 182 * Initialize the current process pointer (curproc) before 183 * any possible traps/probes to simplify trap processing. 184 */ 185 p = &proc0; 186 curproc = p; 187 /* 188 * Attempt to find console and initialize 189 * in case of early panic or other messages. 190 */ 191 consinit(); 192 printf(copyright); 193 194 #if defined(UVM) 195 uvm_init(); 196 #else 197 vm_mem_init(); 198 kmeminit(); 199 #if defined(MACHINE_NEW_NONCONTIG) 200 vm_page_physrehash(); 201 #endif 202 #endif /* UVM */ 203 disk_init(); /* must come before autoconfiguration */ 204 tty_init(); /* initialise tty list */ 205 #if NRND > 0 206 rnd_init(); 207 #endif 208 config_init(); /* init autoconfiguration data structures */ 209 cpu_startup(); 210 211 /* 212 * Initialize process and pgrp structures. 213 */ 214 procinit(); 215 216 /* 217 * Create process 0 (the swapper). 218 */ 219 LIST_INSERT_HEAD(&allproc, p, p_list); 220 p->p_pgrp = &pgrp0; 221 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 222 LIST_INIT(&pgrp0.pg_members); 223 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 224 225 pgrp0.pg_session = &session0; 226 session0.s_count = 1; 227 session0.s_leader = p; 228 229 p->p_flag = P_INMEM | P_SYSTEM; 230 p->p_stat = SRUN; 231 p->p_nice = NZERO; 232 p->p_emul = &emul_netbsd; 233 bcopy("swapper", p->p_comm, sizeof ("swapper")); 234 235 /* Create credentials. */ 236 cred0.p_refcnt = 1; 237 p->p_cred = &cred0; 238 p->p_ucred = crget(); 239 p->p_ucred->cr_ngroups = 1; /* group 0 */ 240 241 /* Create the file descriptor table. */ 242 p->p_fd = &filedesc0.fd_fd; 243 fdinit1(&filedesc0); 244 245 /* Create the limits structures. */ 246 p->p_limit = &limit0; 247 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 248 limit0.pl_rlimit[i].rlim_cur = 249 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 250 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE; 251 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC; 252 #if defined(UVM) 253 i = ptoa(uvmexp.free); 254 #else 255 i = ptoa(cnt.v_free_count); 256 #endif 257 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 258 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 259 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 260 limit0.p_refcnt = 1; 261 262 /* Allocate a prototype map so we have something to fork. */ 263 #if defined(UVM) 264 p->p_vmspace = uvmspace_alloc(round_page(VM_MIN_ADDRESS), 265 trunc_page(VM_MAX_ADDRESS), TRUE); 266 #else 267 p->p_vmspace = vmspace_alloc(round_page(VM_MIN_ADDRESS), 268 trunc_page(VM_MAX_ADDRESS), TRUE); 269 #endif 270 271 p->p_addr = proc0paddr; /* XXX */ 272 273 /* 274 * We continue to place resource usage info and signal 275 * actions in the user struct so they're pageable. 276 */ 277 p->p_stats = &p->p_addr->u_stats; 278 p->p_sigacts = &p->p_addr->u_sigacts; 279 280 /* 281 * Charge root for one process. 282 */ 283 (void)chgproccnt(0, 1); 284 285 rqinit(); 286 287 /* Configure virtual memory system, set vm rlimits. */ 288 #if defined(UVM) 289 uvm_init_limits(p); 290 #else 291 vm_init_limits(p); 292 #endif 293 294 /* Initialize the file systems. */ 295 #if defined(NFSSERVER) || defined(NFS) 296 nfs_init(); /* initialize server/shared data */ 297 #endif 298 vfsinit(); 299 300 /* Start real time and statistics clocks. */ 301 initclocks(); 302 303 /* Initialize mbuf's. */ 304 mbinit(); 305 306 #ifdef REAL_CLISTS 307 /* Initialize clists. */ 308 clist_init(); 309 #endif 310 311 #ifdef SYSVSHM 312 /* Initialize System V style shared memory. */ 313 shminit(); 314 #endif 315 316 #ifdef SYSVSEM 317 /* Initialize System V style semaphores. */ 318 seminit(); 319 #endif 320 321 #ifdef SYSVMSG 322 /* Initialize System V style message queues. */ 323 msginit(); 324 #endif 325 326 /* Attach pseudo-devices. */ 327 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 328 (*pdev->pdev_attach)(pdev->pdev_count); 329 330 /* 331 * Initialize protocols. Block reception of incoming packets 332 * until everything is ready. 333 */ 334 s = splimp(); 335 ifinit(); 336 domaininit(); 337 splx(s); 338 339 #ifdef GPROF 340 /* Initialize kernel profiling. */ 341 kmstartup(); 342 #endif 343 344 /* Kick off timeout driven events by calling first time. */ 345 roundrobin(NULL); 346 schedcpu(NULL); 347 348 /* Determine the root and dump devices. */ 349 cpu_rootconf(); 350 cpu_dumpconf(); 351 352 /* Mount the root file system. */ 353 do { 354 domountroothook(); 355 if ((error = vfs_mountroot())) { 356 printf("cannot mount root, error = %d\n", error); 357 boothowto |= RB_ASKNAME; 358 setroot(root_device, 359 (rootdev != NODEV) ? DISKPART(rootdev) : 0, NULL); 360 } 361 } while (error != 0); 362 mountroothook_destroy(); 363 364 mountlist.cqh_first->mnt_flag |= MNT_ROOTFS; 365 mountlist.cqh_first->mnt_op->vfs_refcount++; 366 367 /* 368 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 369 * reference it. 370 */ 371 if (VFS_ROOT(mountlist.cqh_first, &rootvnode)) 372 panic("cannot find root vnode"); 373 filedesc0.fd_fd.fd_cdir = rootvnode; 374 VREF(filedesc0.fd_fd.fd_cdir); 375 VOP_UNLOCK(rootvnode); 376 filedesc0.fd_fd.fd_rdir = NULL; 377 #if defined(UVM) 378 uvm_swap_init(); 379 #else 380 swapinit(); 381 #endif 382 383 /* 384 * Now can look at time, having had a chance to verify the time 385 * from the file system. Reset p->p_rtime as it may have been 386 * munched in mi_switch() after the time got set. 387 */ 388 p->p_stats->p_start = runtime = mono_time = boottime = time; 389 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 390 391 /* Initialize signal state for process 0. */ 392 siginit(p); 393 394 /* Create process 1 (init(8)). */ 395 if (fork1(p, 0, NULL, &p2)) 396 panic("fork init"); 397 cpu_set_kpc(p2, start_init); 398 399 /* Create process 2 (the pageout daemon). */ 400 if (fork1(p, 0, NULL, &p2)) 401 panic("fork pager"); 402 cpu_set_kpc(p2, start_pagedaemon); 403 404 /* The scheduler is an infinite loop. */ 405 #if defined(UVM) 406 uvm_scheduler(); 407 #else 408 scheduler(); 409 #endif 410 /* NOTREACHED */ 411 } 412 413 static void 414 check_console(p) 415 struct proc *p; 416 { 417 struct nameidata nd; 418 int error; 419 420 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 421 error = namei(&nd); 422 if (error == 0) 423 vrele(nd.ni_vp); 424 else if (error == ENOENT) 425 printf("warning: no /dev/console\n"); 426 else 427 printf("warning: lookup /dev/console: error %d\n", error); 428 } 429 430 /* 431 * List of paths to try when searching for "init". 432 */ 433 static char *initpaths[] = { 434 "/sbin/init", 435 "/sbin/oinit", 436 "/sbin/init.bak", 437 NULL, 438 }; 439 440 /* 441 * Start the initial user process; try exec'ing each pathname in "initpaths". 442 * The program is invoked with one argument containing the boot flags. 443 */ 444 static void 445 start_init(p) 446 struct proc *p; 447 { 448 vm_offset_t addr; 449 struct sys_execve_args /* { 450 syscallarg(const char *) path; 451 syscallarg(char * const *) argp; 452 syscallarg(char * const *) envp; 453 } */ args; 454 int options, i, error; 455 register_t retval[2]; 456 char flags[4], *flagsp; 457 char **pathp, *path, *ucp, **uap, *arg0, *arg1 = NULL; 458 459 /* 460 * Now in process 1. 461 */ 462 initproc = p; 463 464 /* 465 * This is not the right way to do this. We really should 466 * hand-craft a descriptor onto /dev/console to hand to init, 467 * but that's a _lot_ more work, and the benefit from this easy 468 * hack makes up for the "good is the enemy of the best" effect. 469 */ 470 check_console(p); 471 472 /* 473 * Need just enough stack to hold the faked-up "execve()" arguments. 474 */ 475 addr = USRSTACK - PAGE_SIZE; 476 #if defined(UVM) 477 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 478 NULL, UVM_UNKNOWN_OFFSET, 479 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 480 UVM_ADV_NORMAL, 481 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) 482 != KERN_SUCCESS) 483 panic("init: couldn't allocate argument space"); 484 #else 485 if (vm_allocate(&p->p_vmspace->vm_map, &addr, (vm_size_t)PAGE_SIZE, 486 FALSE) != 0) 487 panic("init: couldn't allocate argument space"); 488 #endif 489 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 490 491 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 492 ucp = (char *)(addr + PAGE_SIZE); 493 494 /* 495 * Construct the boot flag argument. 496 */ 497 flagsp = flags; 498 *flagsp++ = '-'; 499 options = 0; 500 501 if (boothowto & RB_SINGLE) { 502 *flagsp++ = 's'; 503 options = 1; 504 } 505 #ifdef notyet 506 if (boothowto & RB_FASTBOOT) { 507 *flagsp++ = 'f'; 508 options = 1; 509 } 510 #endif 511 512 /* 513 * Move out the flags (arg 1), if necessary. 514 */ 515 if (options != 0) { 516 *flagsp++ = '\0'; 517 i = flagsp - flags; 518 #ifdef DEBUG 519 printf("init: copying out flags `%s' %d\n", flags, i); 520 #endif 521 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 522 arg1 = ucp; 523 } 524 525 /* 526 * Move out the file name (also arg 0). 527 */ 528 i = strlen(path) + 1; 529 #ifdef DEBUG 530 printf("init: copying out path `%s' %d\n", path, i); 531 #endif 532 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 533 arg0 = ucp; 534 535 /* 536 * Move out the arg pointers. 537 */ 538 uap = (char **)((long)ucp & ~ALIGNBYTES); 539 (void)suword((caddr_t)--uap, 0); /* terminator */ 540 if (options != 0) 541 (void)suword((caddr_t)--uap, (long)arg1); 542 (void)suword((caddr_t)--uap, (long)arg0); 543 544 /* 545 * Point at the arguments. 546 */ 547 SCARG(&args, path) = arg0; 548 SCARG(&args, argp) = uap; 549 SCARG(&args, envp) = NULL; 550 551 /* 552 * Now try to exec the program. If can't for any reason 553 * other than it doesn't exist, complain. 554 */ 555 error = sys_execve(p, &args, retval); 556 if (error == 0 || error == EJUSTRETURN) 557 return; 558 if (error != ENOENT) 559 printf("exec %s: error %d\n", path, error); 560 } 561 printf("init: not found\n"); 562 panic("no init"); 563 } 564 565 static void 566 start_pagedaemon(p) 567 struct proc *p; 568 { 569 570 /* 571 * Now in process 2. 572 */ 573 p->p_flag |= P_INMEM | P_SYSTEM; /* XXX */ 574 bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon")); 575 #if defined(UVM) 576 uvm_pageout(); 577 #else 578 vm_pageout(); 579 #endif 580 /* NOTREACHED */ 581 } 582
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