init_main.c revision 1.118
1 /* $NetBSD: init_main.c,v 1.118 1998/03/01 02:22:27 fvdl 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 8.16 (Berkeley) 5/14/95 42 */ 43 44 #include "fs_nfs.h" 45 #include "opt_uvm.h" 46 47 #include "rnd.h" 48 49 #include <sys/param.h> 50 #include <sys/filedesc.h> 51 #include <sys/errno.h> 52 #include <sys/exec.h> 53 #include <sys/kernel.h> 54 #include <sys/mount.h> 55 #include <sys/map.h> 56 #include <sys/proc.h> 57 #include <sys/resourcevar.h> 58 #include <sys/signalvar.h> 59 #include <sys/systm.h> 60 #include <sys/vnode.h> 61 #include <sys/tty.h> 62 #include <sys/conf.h> 63 #include <sys/disklabel.h> 64 #include <sys/buf.h> 65 #ifdef REAL_CLISTS 66 #include <sys/clist.h> 67 #endif 68 #include <sys/device.h> 69 #include <sys/protosw.h> 70 #include <sys/reboot.h> 71 #include <sys/user.h> 72 #ifdef SYSVSHM 73 #include <sys/shm.h> 74 #endif 75 #ifdef SYSVSEM 76 #include <sys/sem.h> 77 #endif 78 #ifdef SYSVMSG 79 #include <sys/msg.h> 80 #endif 81 #include <sys/domain.h> 82 #include <sys/mbuf.h> 83 #include <sys/namei.h> 84 #if NRND > 0 85 #include <sys/rnd.h> 86 #endif 87 88 #include <sys/syscall.h> 89 #include <sys/syscallargs.h> 90 91 #include <ufs/ufs/quota.h> 92 93 #include <machine/cpu.h> 94 95 #include <vm/vm.h> 96 #include <vm/vm_pageout.h> 97 98 #if defined(UVM) 99 #include <uvm/uvm.h> 100 #endif 101 102 #include <net/if.h> 103 #include <net/raw_cb.h> 104 105 char copyright[] = "\ 106 Copyright (c) 1996, 1997, 1998 107 The NetBSD Foundation, Inc. All rights reserved. 108 Copyright (c) 1982, 1986, 1989, 1991, 1993 109 The Regents of the University of California. All rights reserved. 110 111 "; 112 113 /* Components of the first process -- never freed. */ 114 struct session session0; 115 struct pgrp pgrp0; 116 struct proc proc0; 117 struct pcred cred0; 118 struct filedesc0 filedesc0; 119 struct plimit limit0; 120 struct vmspace vmspace0; 121 struct proc *curproc = &proc0; 122 struct proc *initproc; 123 124 int cmask = CMASK; 125 extern struct user *proc0paddr; 126 127 struct vnode *rootvp, *swapdev_vp; 128 int boothowto; 129 struct timeval boottime; 130 struct timeval runtime; 131 132 static void check_console __P((struct proc *p)); 133 static void start_init __P((struct proc *)); 134 static void start_pagedaemon __P((struct proc *)); 135 void main __P((void *)); 136 137 extern char sigcode[], esigcode[]; 138 #ifdef SYSCALL_DEBUG 139 extern char *syscallnames[]; 140 #endif 141 142 struct emul emul_netbsd = { 143 "netbsd", 144 NULL, 145 sendsig, 146 SYS_syscall, 147 SYS_MAXSYSCALL, 148 sysent, 149 #ifdef SYSCALL_DEBUG 150 syscallnames, 151 #else 152 NULL, 153 #endif 154 0, 155 copyargs, 156 setregs, 157 sigcode, 158 esigcode, 159 }; 160 161 /* 162 * System startup; initialize the world, create process 0, mount root 163 * filesystem, and fork to create init and pagedaemon. Most of the 164 * hard work is done in the lower-level initialization routines including 165 * startup(), which does memory initialization and autoconfiguration. 166 */ 167 void 168 main(framep) 169 void *framep; /* XXX should go away */ 170 { 171 struct proc *p, *p2; 172 struct pdevinit *pdev; 173 int i, s, error; 174 extern struct pdevinit pdevinit[]; 175 extern void roundrobin __P((void *)); 176 extern void schedcpu __P((void *)); 177 extern void disk_init __P((void)); 178 #if defined(NFSSERVER) || defined(NFS) 179 extern void nfs_init __P((void)); 180 #endif 181 182 /* 183 * Initialize the current process pointer (curproc) before 184 * any possible traps/probes to simplify trap processing. 185 */ 186 p = &proc0; 187 curproc = p; 188 /* 189 * Attempt to find console and initialize 190 * in case of early panic or other messages. 191 */ 192 consinit(); 193 printf(copyright); 194 195 #if defined(UVM) 196 uvm_init(); 197 #else 198 vm_mem_init(); 199 kmeminit(); 200 #if defined(MACHINE_NEW_NONCONTIG) 201 vm_page_physrehash(); 202 #endif 203 #endif /* UVM */ 204 disk_init(); /* must come before autoconfiguration */ 205 tty_init(); /* initialise tty list */ 206 #if NRND > 0 207 rnd_init(); 208 #endif 209 config_init(); /* init autoconfiguration data structures */ 210 cpu_startup(); 211 212 /* 213 * Initialize process and pgrp structures. 214 */ 215 procinit(); 216 217 /* 218 * Create process 0 (the swapper). 219 */ 220 LIST_INSERT_HEAD(&allproc, p, p_list); 221 p->p_pgrp = &pgrp0; 222 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 223 LIST_INIT(&pgrp0.pg_members); 224 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 225 226 pgrp0.pg_session = &session0; 227 session0.s_count = 1; 228 session0.s_sid = p->p_pid; 229 session0.s_leader = p; 230 231 p->p_flag = P_INMEM | P_SYSTEM; 232 p->p_stat = SRUN; 233 p->p_nice = NZERO; 234 p->p_emul = &emul_netbsd; 235 bcopy("swapper", p->p_comm, sizeof ("swapper")); 236 237 /* Create credentials. */ 238 cred0.p_refcnt = 1; 239 p->p_cred = &cred0; 240 p->p_ucred = crget(); 241 p->p_ucred->cr_ngroups = 1; /* group 0 */ 242 243 /* Create the file descriptor table. */ 244 p->p_fd = &filedesc0.fd_fd; 245 fdinit1(&filedesc0); 246 247 /* Create the limits structures. */ 248 p->p_limit = &limit0; 249 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 250 limit0.pl_rlimit[i].rlim_cur = 251 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 252 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE; 253 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC; 254 #if defined(UVM) 255 i = ptoa(uvmexp.free); 256 #else 257 i = ptoa(cnt.v_free_count); 258 #endif 259 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 260 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 261 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 262 limit0.p_refcnt = 1; 263 264 /* Allocate a prototype map so we have something to fork. */ 265 #if defined(UVM) 266 p->p_vmspace = uvmspace_alloc(round_page(VM_MIN_ADDRESS), 267 trunc_page(VM_MAX_ADDRESS), TRUE); 268 #else 269 p->p_vmspace = vmspace_alloc(round_page(VM_MIN_ADDRESS), 270 trunc_page(VM_MAX_ADDRESS), TRUE); 271 #endif 272 273 p->p_addr = proc0paddr; /* XXX */ 274 275 /* 276 * We continue to place resource usage info and signal 277 * actions in the user struct so they're pageable. 278 */ 279 p->p_stats = &p->p_addr->u_stats; 280 p->p_sigacts = &p->p_addr->u_sigacts; 281 282 /* 283 * Charge root for one process. 284 */ 285 (void)chgproccnt(0, 1); 286 287 rqinit(); 288 289 /* Configure virtual memory system, set vm rlimits. */ 290 #if defined(UVM) 291 uvm_init_limits(p); 292 #else 293 vm_init_limits(p); 294 #endif 295 296 /* Initialize the file systems. */ 297 #if defined(NFSSERVER) || defined(NFS) 298 nfs_init(); /* initialize server/shared data */ 299 #endif 300 vfsinit(); 301 302 /* Start real time and statistics clocks. */ 303 initclocks(); 304 305 /* Initialize mbuf's. */ 306 mbinit(); 307 308 #ifdef REAL_CLISTS 309 /* Initialize clists. */ 310 clist_init(); 311 #endif 312 313 #ifdef SYSVSHM 314 /* Initialize System V style shared memory. */ 315 shminit(); 316 #endif 317 318 #ifdef SYSVSEM 319 /* Initialize System V style semaphores. */ 320 seminit(); 321 #endif 322 323 #ifdef SYSVMSG 324 /* Initialize System V style message queues. */ 325 msginit(); 326 #endif 327 328 /* Attach pseudo-devices. */ 329 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 330 (*pdev->pdev_attach)(pdev->pdev_count); 331 332 /* 333 * Initialize protocols. Block reception of incoming packets 334 * until everything is ready. 335 */ 336 s = splimp(); 337 ifinit(); 338 domaininit(); 339 splx(s); 340 341 #ifdef GPROF 342 /* Initialize kernel profiling. */ 343 kmstartup(); 344 #endif 345 346 /* Kick off timeout driven events by calling first time. */ 347 roundrobin(NULL); 348 schedcpu(NULL); 349 350 /* Determine the root and dump devices. */ 351 cpu_rootconf(); 352 cpu_dumpconf(); 353 354 /* Mount the root file system. */ 355 do { 356 domountroothook(); 357 if ((error = vfs_mountroot())) { 358 printf("cannot mount root, error = %d\n", error); 359 boothowto |= RB_ASKNAME; 360 setroot(root_device, 361 (rootdev != NODEV) ? DISKPART(rootdev) : 0, NULL); 362 } 363 } while (error != 0); 364 mountroothook_destroy(); 365 366 mountlist.cqh_first->mnt_flag |= MNT_ROOTFS; 367 mountlist.cqh_first->mnt_op->vfs_refcount++; 368 369 /* 370 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 371 * reference it. 372 */ 373 if (VFS_ROOT(mountlist.cqh_first, &rootvnode)) 374 panic("cannot find root vnode"); 375 filedesc0.fd_fd.fd_cdir = rootvnode; 376 VREF(filedesc0.fd_fd.fd_cdir); 377 VOP_UNLOCK(rootvnode, 0); 378 filedesc0.fd_fd.fd_rdir = NULL; 379 #if defined(UVM) 380 uvm_swap_init(); 381 #else 382 swapinit(); 383 #endif 384 385 /* 386 * Now can look at time, having had a chance to verify the time 387 * from the file system. Reset p->p_rtime as it may have been 388 * munched in mi_switch() after the time got set. 389 */ 390 p->p_stats->p_start = runtime = mono_time = boottime = time; 391 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 392 393 /* Initialize signal state for process 0. */ 394 siginit(p); 395 396 /* Create process 1 (init(8)). */ 397 if (fork1(p, 0, NULL, &p2)) 398 panic("fork init"); 399 cpu_set_kpc(p2, start_init); 400 401 /* Create process 2 (the pageout daemon). */ 402 if (fork1(p, 0, NULL, &p2)) 403 panic("fork pager"); 404 cpu_set_kpc(p2, start_pagedaemon); 405 406 /* The scheduler is an infinite loop. */ 407 #if defined(UVM) 408 uvm_scheduler(); 409 #else 410 scheduler(); 411 #endif 412 /* NOTREACHED */ 413 } 414 415 static void 416 check_console(p) 417 struct proc *p; 418 { 419 struct nameidata nd; 420 int error; 421 422 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 423 error = namei(&nd); 424 if (error == 0) 425 vrele(nd.ni_vp); 426 else if (error == ENOENT) 427 printf("warning: no /dev/console\n"); 428 else 429 printf("warning: lookup /dev/console: error %d\n", error); 430 } 431 432 /* 433 * List of paths to try when searching for "init". 434 */ 435 static char *initpaths[] = { 436 "/sbin/init", 437 "/sbin/oinit", 438 "/sbin/init.bak", 439 NULL, 440 }; 441 442 /* 443 * Start the initial user process; try exec'ing each pathname in "initpaths". 444 * The program is invoked with one argument containing the boot flags. 445 */ 446 static void 447 start_init(p) 448 struct proc *p; 449 { 450 vm_offset_t addr; 451 struct sys_execve_args /* { 452 syscallarg(const char *) path; 453 syscallarg(char * const *) argp; 454 syscallarg(char * const *) envp; 455 } */ args; 456 int options, i, error; 457 register_t retval[2]; 458 char flags[4], *flagsp; 459 char **pathp, *path, *ucp, **uap, *arg0, *arg1 = NULL; 460 461 /* 462 * Now in process 1. 463 */ 464 initproc = p; 465 466 /* 467 * This is not the right way to do this. We really should 468 * hand-craft a descriptor onto /dev/console to hand to init, 469 * but that's a _lot_ more work, and the benefit from this easy 470 * hack makes up for the "good is the enemy of the best" effect. 471 */ 472 check_console(p); 473 474 /* 475 * Need just enough stack to hold the faked-up "execve()" arguments. 476 */ 477 addr = USRSTACK - PAGE_SIZE; 478 #if defined(UVM) 479 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 480 NULL, UVM_UNKNOWN_OFFSET, 481 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 482 UVM_ADV_NORMAL, 483 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) 484 != KERN_SUCCESS) 485 panic("init: couldn't allocate argument space"); 486 #else 487 if (vm_allocate(&p->p_vmspace->vm_map, &addr, (vm_size_t)PAGE_SIZE, 488 FALSE) != 0) 489 panic("init: couldn't allocate argument space"); 490 #endif 491 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 492 493 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 494 ucp = (char *)(addr + PAGE_SIZE); 495 496 /* 497 * Construct the boot flag argument. 498 */ 499 flagsp = flags; 500 *flagsp++ = '-'; 501 options = 0; 502 503 if (boothowto & RB_SINGLE) { 504 *flagsp++ = 's'; 505 options = 1; 506 } 507 #ifdef notyet 508 if (boothowto & RB_FASTBOOT) { 509 *flagsp++ = 'f'; 510 options = 1; 511 } 512 #endif 513 514 /* 515 * Move out the flags (arg 1), if necessary. 516 */ 517 if (options != 0) { 518 *flagsp++ = '\0'; 519 i = flagsp - flags; 520 #ifdef DEBUG 521 printf("init: copying out flags `%s' %d\n", flags, i); 522 #endif 523 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 524 arg1 = ucp; 525 } 526 527 /* 528 * Move out the file name (also arg 0). 529 */ 530 i = strlen(path) + 1; 531 #ifdef DEBUG 532 printf("init: copying out path `%s' %d\n", path, i); 533 #endif 534 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 535 arg0 = ucp; 536 537 /* 538 * Move out the arg pointers. 539 */ 540 uap = (char **)((long)ucp & ~ALIGNBYTES); 541 (void)suword((caddr_t)--uap, 0); /* terminator */ 542 if (options != 0) 543 (void)suword((caddr_t)--uap, (long)arg1); 544 (void)suword((caddr_t)--uap, (long)arg0); 545 546 /* 547 * Point at the arguments. 548 */ 549 SCARG(&args, path) = arg0; 550 SCARG(&args, argp) = uap; 551 SCARG(&args, envp) = NULL; 552 553 /* 554 * Now try to exec the program. If can't for any reason 555 * other than it doesn't exist, complain. 556 */ 557 error = sys_execve(p, &args, retval); 558 if (error == 0 || error == EJUSTRETURN) 559 return; 560 if (error != ENOENT) 561 printf("exec %s: error %d\n", path, error); 562 } 563 printf("init: not found\n"); 564 panic("no init"); 565 } 566 567 static void 568 start_pagedaemon(p) 569 struct proc *p; 570 { 571 572 /* 573 * Now in process 2. 574 */ 575 p->p_flag |= P_INMEM | P_SYSTEM; /* XXX */ 576 bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon")); 577 #if defined(UVM) 578 uvm_pageout(); 579 #else 580 vm_pageout(); 581 #endif 582 /* NOTREACHED */ 583 } 584
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