init_main.c revision 1.87
1 /* $NetBSD: init_main.c,v 1.87 1996/10/09 00:59:15 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/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/tty.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 79 #include <sys/syscall.h> 80 #include <sys/syscallargs.h> 81 82 #include <ufs/ufs/quota.h> 83 84 #include <machine/cpu.h> 85 86 #include <vm/vm.h> 87 #include <vm/vm_pageout.h> 88 89 #include <net/if.h> 90 #include <net/raw_cb.h> 91 92 char copyright[] = 93 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n The Regents of the University of California. All rights reserved.\n\n"; 94 95 /* Components of the first process -- never freed. */ 96 struct session session0; 97 struct pgrp pgrp0; 98 struct proc proc0; 99 struct pcred cred0; 100 struct filedesc0 filedesc0; 101 struct plimit limit0; 102 struct vmspace vmspace0; 103 struct proc *curproc = &proc0; 104 struct proc *initproc, *pageproc; 105 106 int cmask = CMASK; 107 extern struct user *proc0paddr; 108 109 struct vnode *rootvp, *swapdev_vp; 110 int boothowto; 111 struct timeval boottime; 112 struct timeval runtime; 113 114 static void start_init __P((struct proc *)); 115 static void start_pagedaemon __P((struct proc *)); 116 void main __P((void *)); 117 118 #ifdef cpu_set_init_frame 119 void *initframep; /* XXX should go away */ 120 #endif 121 122 extern char sigcode[], esigcode[]; 123 #ifdef SYSCALL_DEBUG 124 extern char *syscallnames[]; 125 #endif 126 127 struct emul emul_netbsd = { 128 "netbsd", 129 NULL, 130 sendsig, 131 SYS_syscall, 132 SYS_MAXSYSCALL, 133 sysent, 134 #ifdef SYSCALL_DEBUG 135 syscallnames, 136 #else 137 NULL, 138 #endif 139 0, 140 copyargs, 141 setregs, 142 sigcode, 143 esigcode, 144 }; 145 146 /* 147 * System startup; initialize the world, create process 0, mount root 148 * filesystem, and fork to create init and pagedaemon. Most of the 149 * hard work is done in the lower-level initialization routines including 150 * startup(), which does memory initialization and autoconfiguration. 151 */ 152 void 153 main(framep) 154 void *framep; /* XXX should go away */ 155 { 156 register struct proc *p; 157 register struct pdevinit *pdev; 158 register int i; 159 int s; 160 register_t rval[2]; 161 extern int (*mountroot) __P((void)); 162 extern struct pdevinit pdevinit[]; 163 extern void roundrobin __P((void *)); 164 extern void schedcpu __P((void *)); 165 extern void disk_init __P((void)); 166 167 /* 168 * Initialize the current process pointer (curproc) before 169 * any possible traps/probes to simplify trap processing. 170 */ 171 p = &proc0; 172 curproc = p; 173 /* 174 * Attempt to find console and initialize 175 * in case of early panic or other messages. 176 */ 177 consinit(); 178 printf(copyright); 179 180 vm_mem_init(); 181 kmeminit(); 182 disk_init(); /* must come before autoconfiguration */ 183 tty_init(); /* initialise tty list */ 184 config_init(); /* init autoconfiguration data structures */ 185 cpu_startup(); 186 187 /* 188 * Initialize process and pgrp structures. 189 */ 190 procinit(); 191 192 /* 193 * Create process 0 (the swapper). 194 */ 195 LIST_INSERT_HEAD(&allproc, p, p_list); 196 p->p_pgrp = &pgrp0; 197 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 198 LIST_INIT(&pgrp0.pg_members); 199 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 200 201 pgrp0.pg_session = &session0; 202 session0.s_count = 1; 203 session0.s_leader = p; 204 205 p->p_flag = P_INMEM | P_SYSTEM; 206 p->p_stat = SRUN; 207 p->p_nice = NZERO; 208 p->p_emul = &emul_netbsd; 209 bcopy("swapper", p->p_comm, sizeof ("swapper")); 210 211 /* Create credentials. */ 212 cred0.p_refcnt = 1; 213 p->p_cred = &cred0; 214 p->p_ucred = crget(); 215 p->p_ucred->cr_ngroups = 1; /* group 0 */ 216 217 /* Create the file descriptor table. */ 218 p->p_fd = &filedesc0.fd_fd; 219 filedesc0.fd_fd.fd_refcnt = 1; 220 filedesc0.fd_fd.fd_cmask = cmask; 221 filedesc0.fd_fd.fd_ofiles = filedesc0.fd_dfiles; 222 filedesc0.fd_fd.fd_ofileflags = filedesc0.fd_dfileflags; 223 filedesc0.fd_fd.fd_nfiles = NDFILE; 224 225 /* Create the limits structures. */ 226 p->p_limit = &limit0; 227 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 228 limit0.pl_rlimit[i].rlim_cur = 229 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 230 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE; 231 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC; 232 i = ptoa(cnt.v_free_count); 233 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 234 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 235 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 236 limit0.p_refcnt = 1; 237 238 /* Allocate a prototype map so we have something to fork. */ 239 p->p_vmspace = &vmspace0; 240 vmspace0.vm_refcnt = 1; 241 pmap_pinit(&vmspace0.vm_pmap); 242 vm_map_init(&p->p_vmspace->vm_map, round_page(VM_MIN_ADDRESS), 243 trunc_page(VM_MAX_ADDRESS), TRUE); 244 vmspace0.vm_map.pmap = &vmspace0.vm_pmap; 245 p->p_addr = proc0paddr; /* XXX */ 246 247 /* 248 * We continue to place resource usage info and signal 249 * actions in the user struct so they're pageable. 250 */ 251 p->p_stats = &p->p_addr->u_stats; 252 p->p_sigacts = &p->p_addr->u_sigacts; 253 254 /* 255 * Charge root for one process. 256 */ 257 (void)chgproccnt(0, 1); 258 259 rqinit(); 260 261 /* Configure virtual memory system, set vm rlimits. */ 262 vm_init_limits(p); 263 264 /* Initialize the file systems. */ 265 vfsinit(); 266 267 /* Start real time and statistics clocks. */ 268 initclocks(); 269 270 /* Initialize mbuf's. */ 271 mbinit(); 272 273 #ifdef REAL_CLISTS 274 /* Initialize clists. */ 275 clist_init(); 276 #endif 277 278 #ifdef SYSVSHM 279 /* Initialize System V style shared memory. */ 280 shminit(); 281 #endif 282 283 #ifdef SYSVSEM 284 /* Initialize System V style semaphores. */ 285 seminit(); 286 #endif 287 288 #ifdef SYSVMSG 289 /* Initialize System V style message queues. */ 290 msginit(); 291 #endif 292 293 /* Attach pseudo-devices. */ 294 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 295 (*pdev->pdev_attach)(pdev->pdev_count); 296 297 /* 298 * Initialize protocols. Block reception of incoming packets 299 * until everything is ready. 300 */ 301 s = splimp(); 302 ifinit(); 303 domaininit(); 304 splx(s); 305 306 #ifdef GPROF 307 /* Initialize kernel profiling. */ 308 kmstartup(); 309 #endif 310 311 /* Kick off timeout driven events by calling first time. */ 312 roundrobin(NULL); 313 schedcpu(NULL); 314 315 /* Mount the root file system. */ 316 if ((*mountroot)()) 317 panic("cannot mount root"); 318 mountlist.cqh_first->mnt_flag |= MNT_ROOTFS; 319 mountlist.cqh_first->mnt_op->vfs_refcount++; 320 321 /* Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to reference it. */ 322 if (VFS_ROOT(mountlist.cqh_first, &rootvnode)) 323 panic("cannot find root vnode"); 324 filedesc0.fd_fd.fd_cdir = rootvnode; 325 VREF(filedesc0.fd_fd.fd_cdir); 326 VOP_UNLOCK(rootvnode); 327 filedesc0.fd_fd.fd_rdir = NULL; 328 swapinit(); 329 330 /* 331 * Now can look at time, having had a chance to verify the time 332 * from the file system. Reset p->p_rtime as it may have been 333 * munched in mi_switch() after the time got set. 334 */ 335 p->p_stats->p_start = runtime = mono_time = boottime = time; 336 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 337 338 /* Initialize signal state for process 0. */ 339 siginit(p); 340 341 /* Create process 1 (init(8)). */ 342 if (sys_fork(p, NULL, rval)) 343 panic("fork init"); 344 #ifdef cpu_set_init_frame /* XXX should go away */ 345 if (rval[1]) { 346 /* 347 * Now in process 1. 348 */ 349 initframep = framep; 350 start_init(curproc); 351 return; 352 } 353 #else 354 cpu_set_kpc(pfind(1), start_init); 355 #endif 356 357 /* Create process 2 (the pageout daemon). */ 358 if (sys_fork(p, NULL, rval)) 359 panic("fork pager"); 360 #ifdef cpu_set_init_frame /* XXX should go away */ 361 if (rval[1]) { 362 /* 363 * Now in process 2. 364 */ 365 start_pagedaemon(curproc); 366 } 367 #else 368 cpu_set_kpc(pfind(2), start_pagedaemon); 369 #endif 370 371 /* The scheduler is an infinite loop. */ 372 scheduler(); 373 /* NOTREACHED */ 374 } 375 376 /* 377 * List of paths to try when searching for "init". 378 */ 379 static char *initpaths[] = { 380 "/sbin/init", 381 "/sbin/oinit", 382 "/sbin/init.bak", 383 NULL, 384 }; 385 386 /* 387 * Start the initial user process; try exec'ing each pathname in "initpaths". 388 * The program is invoked with one argument containing the boot flags. 389 */ 390 static void 391 start_init(p) 392 struct proc *p; 393 { 394 vm_offset_t addr; 395 struct sys_execve_args /* { 396 syscallarg(char *) path; 397 syscallarg(char **) argp; 398 syscallarg(char **) envp; 399 } */ args; 400 int options, i, error; 401 register_t retval[2]; 402 char flags[4], *flagsp; 403 char **pathp, *path, *ucp, **uap, *arg0, *arg1 = NULL; 404 405 /* 406 * Now in process 1. 407 */ 408 initproc = p; 409 410 #ifdef cpu_set_init_frame /* XXX should go away */ 411 /* 412 * We need to set the system call frame as if we were entered through 413 * a syscall() so that when we call sys_execve() below, it will be able 414 * to set the entry point (see setregs) when it tries to exec. The 415 * startup code in "locore.s" has allocated space for the frame and 416 * passed a pointer to that space as main's argument. 417 */ 418 cpu_set_init_frame(p, initframep); 419 #endif 420 421 /* 422 * Need just enough stack to hold the faked-up "execve()" arguments. 423 */ 424 addr = USRSTACK - PAGE_SIZE; 425 if (vm_allocate(&p->p_vmspace->vm_map, &addr, (vm_size_t)PAGE_SIZE, 426 FALSE) != 0) 427 panic("init: couldn't allocate argument space"); 428 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 429 430 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 431 ucp = (char *)(addr + PAGE_SIZE); 432 433 /* 434 * Construct the boot flag argument. 435 */ 436 flagsp = flags; 437 *flagsp++ = '-'; 438 options = 0; 439 440 if (boothowto & RB_SINGLE) { 441 *flagsp++ = 's'; 442 options = 1; 443 } 444 #ifdef notyet 445 if (boothowto & RB_FASTBOOT) { 446 *flagsp++ = 'f'; 447 options = 1; 448 } 449 #endif 450 451 /* 452 * Move out the flags (arg 1), if necessary. 453 */ 454 if (options != 0) { 455 *flagsp++ = '\0'; 456 i = flagsp - flags; 457 #ifdef DEBUG 458 printf("init: copying out flags `%s' %d\n", flags, i); 459 #endif 460 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 461 arg1 = ucp; 462 } 463 464 /* 465 * Move out the file name (also arg 0). 466 */ 467 i = strlen(path) + 1; 468 #ifdef DEBUG 469 printf("init: copying out path `%s' %d\n", path, i); 470 #endif 471 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 472 arg0 = ucp; 473 474 /* 475 * Move out the arg pointers. 476 */ 477 uap = (char **)((long)ucp & ~ALIGNBYTES); 478 (void)suword((caddr_t)--uap, 0); /* terminator */ 479 if (options != 0) 480 (void)suword((caddr_t)--uap, (long)arg1); 481 (void)suword((caddr_t)--uap, (long)arg0); 482 483 /* 484 * Point at the arguments. 485 */ 486 SCARG(&args, path) = arg0; 487 SCARG(&args, argp) = uap; 488 SCARG(&args, envp) = NULL; 489 490 /* 491 * Now try to exec the program. If can't for any reason 492 * other than it doesn't exist, complain. 493 */ 494 if ((error = sys_execve(p, &args, retval)) == 0) 495 return; 496 if (error != ENOENT) 497 printf("exec %s: error %d\n", path, error); 498 } 499 printf("init: not found\n"); 500 panic("no init"); 501 } 502 503 static void 504 start_pagedaemon(p) 505 struct proc *p; 506 { 507 508 /* 509 * Now in process 2. 510 */ 511 pageproc = p; 512 p->p_flag |= P_INMEM | P_SYSTEM; /* XXX */ 513 bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon")); 514 vm_pageout(); 515 /* NOTREACHED */ 516 } 517
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