init_main.c revision 1.90
1 /* $NetBSD: init_main.c,v 1.90 1996/10/13 02:32:30 christos 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)); 165 166 /* 167 * Initialize the current process pointer (curproc) before 168 * any possible traps/probes to simplify trap processing. 169 */ 170 p = &proc0; 171 curproc = p; 172 /* 173 * Attempt to find console and initialize 174 * in case of early panic or other messages. 175 */ 176 consinit(); 177 printf(copyright); 178 179 vm_mem_init(); 180 kmeminit(); 181 disk_init(); /* must come before autoconfiguration */ 182 tty_init(); /* initialise tty list */ 183 config_init(); /* init autoconfiguration data structures */ 184 cpu_startup(); 185 186 /* 187 * Initialize process and pgrp structures. 188 */ 189 procinit(); 190 191 /* 192 * Create process 0 (the swapper). 193 */ 194 LIST_INSERT_HEAD(&allproc, p, p_list); 195 p->p_pgrp = &pgrp0; 196 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 197 LIST_INIT(&pgrp0.pg_members); 198 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 199 200 pgrp0.pg_session = &session0; 201 session0.s_count = 1; 202 session0.s_leader = p; 203 204 p->p_flag = P_INMEM | P_SYSTEM; 205 p->p_stat = SRUN; 206 p->p_nice = NZERO; 207 p->p_emul = &emul_netbsd; 208 bcopy("swapper", p->p_comm, sizeof ("swapper")); 209 210 /* Create credentials. */ 211 cred0.p_refcnt = 1; 212 p->p_cred = &cred0; 213 p->p_ucred = crget(); 214 p->p_ucred->cr_ngroups = 1; /* group 0 */ 215 216 /* Create the file descriptor table. */ 217 p->p_fd = &filedesc0.fd_fd; 218 filedesc0.fd_fd.fd_refcnt = 1; 219 filedesc0.fd_fd.fd_cmask = cmask; 220 filedesc0.fd_fd.fd_ofiles = filedesc0.fd_dfiles; 221 filedesc0.fd_fd.fd_ofileflags = filedesc0.fd_dfileflags; 222 filedesc0.fd_fd.fd_nfiles = NDFILE; 223 224 /* Create the limits structures. */ 225 p->p_limit = &limit0; 226 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 227 limit0.pl_rlimit[i].rlim_cur = 228 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 229 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE; 230 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC; 231 i = ptoa(cnt.v_free_count); 232 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 233 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 234 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 235 limit0.p_refcnt = 1; 236 237 /* Allocate a prototype map so we have something to fork. */ 238 p->p_vmspace = &vmspace0; 239 vmspace0.vm_refcnt = 1; 240 pmap_pinit(&vmspace0.vm_pmap); 241 vm_map_init(&p->p_vmspace->vm_map, round_page(VM_MIN_ADDRESS), 242 trunc_page(VM_MAX_ADDRESS), TRUE); 243 vmspace0.vm_map.pmap = &vmspace0.vm_pmap; 244 p->p_addr = proc0paddr; /* XXX */ 245 246 /* 247 * We continue to place resource usage info and signal 248 * actions in the user struct so they're pageable. 249 */ 250 p->p_stats = &p->p_addr->u_stats; 251 p->p_sigacts = &p->p_addr->u_sigacts; 252 253 /* 254 * Charge root for one process. 255 */ 256 (void)chgproccnt(0, 1); 257 258 rqinit(); 259 260 /* Configure virtual memory system, set vm rlimits. */ 261 vm_init_limits(p); 262 263 /* Initialize the file systems. */ 264 vfsinit(); 265 266 /* Start real time and statistics clocks. */ 267 initclocks(); 268 269 /* Initialize mbuf's. */ 270 mbinit(); 271 272 #ifdef REAL_CLISTS 273 /* Initialize clists. */ 274 clist_init(); 275 #endif 276 277 #ifdef SYSVSHM 278 /* Initialize System V style shared memory. */ 279 shminit(); 280 #endif 281 282 #ifdef SYSVSEM 283 /* Initialize System V style semaphores. */ 284 seminit(); 285 #endif 286 287 #ifdef SYSVMSG 288 /* Initialize System V style message queues. */ 289 msginit(); 290 #endif 291 292 /* Attach pseudo-devices. */ 293 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 294 (*pdev->pdev_attach)(pdev->pdev_count); 295 296 /* 297 * Initialize protocols. Block reception of incoming packets 298 * until everything is ready. 299 */ 300 s = splimp(); 301 ifinit(); 302 domaininit(); 303 splx(s); 304 305 #ifdef GPROF 306 /* Initialize kernel profiling. */ 307 kmstartup(); 308 #endif 309 310 /* Kick off timeout driven events by calling first time. */ 311 roundrobin(NULL); 312 schedcpu(NULL); 313 314 /* Mount the root file system. */ 315 if ((*mountroot)()) 316 panic("cannot mount root"); 317 mountlist.cqh_first->mnt_flag |= MNT_ROOTFS; 318 mountlist.cqh_first->mnt_op->vfs_refcount++; 319 320 /* Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to reference it. */ 321 if (VFS_ROOT(mountlist.cqh_first, &rootvnode)) 322 panic("cannot find root vnode"); 323 filedesc0.fd_fd.fd_cdir = rootvnode; 324 VREF(filedesc0.fd_fd.fd_cdir); 325 VOP_UNLOCK(rootvnode); 326 filedesc0.fd_fd.fd_rdir = NULL; 327 swapinit(); 328 329 /* 330 * Now can look at time, having had a chance to verify the time 331 * from the file system. Reset p->p_rtime as it may have been 332 * munched in mi_switch() after the time got set. 333 */ 334 p->p_stats->p_start = runtime = mono_time = boottime = time; 335 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 336 337 /* Initialize signal state for process 0. */ 338 siginit(p); 339 340 /* Create process 1 (init(8)). */ 341 if (sys_fork(p, NULL, rval)) 342 panic("fork init"); 343 #ifdef cpu_set_init_frame /* XXX should go away */ 344 if (rval[1]) { 345 /* 346 * Now in process 1. 347 */ 348 initframep = framep; 349 start_init(curproc); 350 return; 351 } 352 #else 353 cpu_set_kpc(pfind(1), start_init); 354 #endif 355 356 /* Create process 2 (the pageout daemon). */ 357 if (sys_fork(p, NULL, rval)) 358 panic("fork pager"); 359 #ifdef cpu_set_init_frame /* XXX should go away */ 360 if (rval[1]) { 361 /* 362 * Now in process 2. 363 */ 364 start_pagedaemon(curproc); 365 } 366 #else 367 cpu_set_kpc(pfind(2), start_pagedaemon); 368 #endif 369 370 /* The scheduler is an infinite loop. */ 371 scheduler(); 372 /* NOTREACHED */ 373 } 374 375 /* 376 * List of paths to try when searching for "init". 377 */ 378 static char *initpaths[] = { 379 "/sbin/init", 380 "/sbin/oinit", 381 "/sbin/init.bak", 382 NULL, 383 }; 384 385 /* 386 * Start the initial user process; try exec'ing each pathname in "initpaths". 387 * The program is invoked with one argument containing the boot flags. 388 */ 389 static void 390 start_init(p) 391 struct proc *p; 392 { 393 vm_offset_t addr; 394 struct sys_execve_args /* { 395 syscallarg(char *) path; 396 syscallarg(char **) argp; 397 syscallarg(char **) envp; 398 } */ args; 399 int options, i, error; 400 register_t retval[2]; 401 char flags[4], *flagsp; 402 char **pathp, *path, *ucp, **uap, *arg0, *arg1 = NULL; 403 404 /* 405 * Now in process 1. 406 */ 407 initproc = p; 408 409 #ifdef cpu_set_init_frame /* XXX should go away */ 410 /* 411 * We need to set the system call frame as if we were entered through 412 * a syscall() so that when we call sys_execve() below, it will be able 413 * to set the entry point (see setregs) when it tries to exec. The 414 * startup code in "locore.s" has allocated space for the frame and 415 * passed a pointer to that space as main's argument. 416 */ 417 cpu_set_init_frame(p, initframep); 418 #endif 419 420 /* 421 * Need just enough stack to hold the faked-up "execve()" arguments. 422 */ 423 addr = USRSTACK - PAGE_SIZE; 424 if (vm_allocate(&p->p_vmspace->vm_map, &addr, (vm_size_t)PAGE_SIZE, 425 FALSE) != 0) 426 panic("init: couldn't allocate argument space"); 427 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 428 429 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 430 ucp = (char *)(addr + PAGE_SIZE); 431 432 /* 433 * Construct the boot flag argument. 434 */ 435 flagsp = flags; 436 *flagsp++ = '-'; 437 options = 0; 438 439 if (boothowto & RB_SINGLE) { 440 *flagsp++ = 's'; 441 options = 1; 442 } 443 #ifdef notyet 444 if (boothowto & RB_FASTBOOT) { 445 *flagsp++ = 'f'; 446 options = 1; 447 } 448 #endif 449 450 /* 451 * Move out the flags (arg 1), if necessary. 452 */ 453 if (options != 0) { 454 *flagsp++ = '\0'; 455 i = flagsp - flags; 456 #ifdef DEBUG 457 printf("init: copying out flags `%s' %d\n", flags, i); 458 #endif 459 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 460 arg1 = ucp; 461 } 462 463 /* 464 * Move out the file name (also arg 0). 465 */ 466 i = strlen(path) + 1; 467 #ifdef DEBUG 468 printf("init: copying out path `%s' %d\n", path, i); 469 #endif 470 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 471 arg0 = ucp; 472 473 /* 474 * Move out the arg pointers. 475 */ 476 uap = (char **)((long)ucp & ~ALIGNBYTES); 477 (void)suword((caddr_t)--uap, 0); /* terminator */ 478 if (options != 0) 479 (void)suword((caddr_t)--uap, (long)arg1); 480 (void)suword((caddr_t)--uap, (long)arg0); 481 482 /* 483 * Point at the arguments. 484 */ 485 SCARG(&args, path) = arg0; 486 SCARG(&args, argp) = uap; 487 SCARG(&args, envp) = NULL; 488 489 /* 490 * Now try to exec the program. If can't for any reason 491 * other than it doesn't exist, complain. 492 */ 493 if ((error = sys_execve(p, &args, retval)) == 0) 494 return; 495 if (error != ENOENT) 496 printf("exec %s: error %d\n", path, error); 497 } 498 printf("init: not found\n"); 499 panic("no init"); 500 } 501 502 static void 503 start_pagedaemon(p) 504 struct proc *p; 505 { 506 507 /* 508 * Now in process 2. 509 */ 510 pageproc = p; 511 p->p_flag |= P_INMEM | P_SYSTEM; /* XXX */ 512 bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon")); 513 vm_pageout(); 514 /* NOTREACHED */ 515 } 516
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