init_main.c revision 1.83
1 /* $NetBSD: init_main.c,v 1.83 1996/04/04 00:26:28 cgd 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/conf.h> 57 #include <sys/buf.h> 58 #ifdef REAL_CLISTS 59 #include <sys/clist.h> 60 #endif 61 #include <sys/device.h> 62 #include <sys/protosw.h> 63 #include <sys/reboot.h> 64 #include <sys/user.h> 65 #include <sys/cpu.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\tThe 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 config_init(); /* init autoconfiguration data structures */ 183 cpu_startup(); 184 185 /* 186 * Initialize process and pgrp structures. 187 */ 188 procinit(); 189 190 /* 191 * Create process 0 (the swapper). 192 */ 193 LIST_INSERT_HEAD(&allproc, p, p_list); 194 p->p_pgrp = &pgrp0; 195 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 196 LIST_INIT(&pgrp0.pg_members); 197 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 198 199 pgrp0.pg_session = &session0; 200 session0.s_count = 1; 201 session0.s_leader = p; 202 203 p->p_flag = P_INMEM | P_SYSTEM; 204 p->p_stat = SRUN; 205 p->p_nice = NZERO; 206 p->p_emul = &emul_netbsd; 207 bcopy("swapper", p->p_comm, sizeof ("swapper")); 208 209 /* Create credentials. */ 210 cred0.p_refcnt = 1; 211 p->p_cred = &cred0; 212 p->p_ucred = crget(); 213 p->p_ucred->cr_ngroups = 1; /* group 0 */ 214 215 /* Create the file descriptor table. */ 216 p->p_fd = &filedesc0.fd_fd; 217 filedesc0.fd_fd.fd_refcnt = 1; 218 filedesc0.fd_fd.fd_cmask = cmask; 219 filedesc0.fd_fd.fd_ofiles = filedesc0.fd_dfiles; 220 filedesc0.fd_fd.fd_ofileflags = filedesc0.fd_dfileflags; 221 filedesc0.fd_fd.fd_nfiles = NDFILE; 222 223 /* Create the limits structures. */ 224 p->p_limit = &limit0; 225 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 226 limit0.pl_rlimit[i].rlim_cur = 227 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 228 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE; 229 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC; 230 i = ptoa(cnt.v_free_count); 231 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 232 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 233 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 234 limit0.p_refcnt = 1; 235 236 /* Allocate a prototype map so we have something to fork. */ 237 p->p_vmspace = &vmspace0; 238 vmspace0.vm_refcnt = 1; 239 pmap_pinit(&vmspace0.vm_pmap); 240 vm_map_init(&p->p_vmspace->vm_map, round_page(VM_MIN_ADDRESS), 241 trunc_page(VM_MAX_ADDRESS), TRUE); 242 vmspace0.vm_map.pmap = &vmspace0.vm_pmap; 243 p->p_addr = proc0paddr; /* XXX */ 244 245 /* 246 * We continue to place resource usage info and signal 247 * actions in the user struct so they're pageable. 248 */ 249 p->p_stats = &p->p_addr->u_stats; 250 p->p_sigacts = &p->p_addr->u_sigacts; 251 252 /* 253 * Charge root for one process. 254 */ 255 (void)chgproccnt(0, 1); 256 257 rqinit(); 258 259 /* Configure virtual memory system, set vm rlimits. */ 260 vm_init_limits(p); 261 262 /* Initialize the file systems. */ 263 vfsinit(); 264 265 /* Start real time and statistics clocks. */ 266 initclocks(); 267 268 /* Initialize mbuf's. */ 269 mbinit(); 270 271 #ifdef REAL_CLISTS 272 /* Initialize clists. */ 273 clist_init(); 274 #endif 275 276 #ifdef SYSVSHM 277 /* Initialize System V style shared memory. */ 278 shminit(); 279 #endif 280 281 #ifdef SYSVSEM 282 /* Initialize System V style semaphores. */ 283 seminit(); 284 #endif 285 286 #ifdef SYSVMSG 287 /* Initialize System V style message queues. */ 288 msginit(); 289 #endif 290 291 /* Attach pseudo-devices. */ 292 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 293 (*pdev->pdev_attach)(pdev->pdev_count); 294 295 /* 296 * Initialize protocols. Block reception of incoming packets 297 * until everything is ready. 298 */ 299 s = splimp(); 300 ifinit(); 301 domaininit(); 302 splx(s); 303 304 #ifdef GPROF 305 /* Initialize kernel profiling. */ 306 kmstartup(); 307 #endif 308 309 /* Kick off timeout driven events by calling first time. */ 310 roundrobin(NULL); 311 schedcpu(NULL); 312 313 /* Mount the root file system. */ 314 if ((*mountroot)()) 315 panic("cannot mount root"); 316 mountlist.cqh_first->mnt_flag |= MNT_ROOTFS; 317 mountlist.cqh_first->mnt_op->vfs_refcount++; 318 319 /* Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to reference it. */ 320 if (VFS_ROOT(mountlist.cqh_first, &rootvnode)) 321 panic("cannot find root vnode"); 322 filedesc0.fd_fd.fd_cdir = rootvnode; 323 VREF(filedesc0.fd_fd.fd_cdir); 324 VOP_UNLOCK(rootvnode); 325 filedesc0.fd_fd.fd_rdir = NULL; 326 swapinit(); 327 328 /* 329 * Now can look at time, having had a chance to verify the time 330 * from the file system. Reset p->p_rtime as it may have been 331 * munched in mi_switch() after the time got set. 332 */ 333 p->p_stats->p_start = runtime = mono_time = boottime = time; 334 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 335 336 /* Initialize signal state for process 0. */ 337 siginit(p); 338 339 /* Create process 1 (init(8)). */ 340 if (sys_fork(p, NULL, rval)) 341 panic("fork init"); 342 #ifdef cpu_set_init_frame /* XXX should go away */ 343 if (rval[1]) { 344 /* 345 * Now in process 1. 346 */ 347 initframep = framep; 348 start_init(curproc); 349 return; 350 } 351 #else 352 cpu_set_kpc(pfind(1), start_init); 353 #endif 354 355 /* Create process 2 (the pageout daemon). */ 356 if (sys_fork(p, NULL, rval)) 357 panic("fork pager"); 358 #ifdef cpu_set_init_frame /* XXX should go away */ 359 if (rval[1]) { 360 /* 361 * Now in process 2. 362 */ 363 start_pagedaemon(curproc); 364 } 365 #else 366 cpu_set_kpc(pfind(2), start_pagedaemon); 367 #endif 368 369 /* The scheduler is an infinite loop. */ 370 scheduler(); 371 /* NOTREACHED */ 372 } 373 374 /* 375 * List of paths to try when searching for "init". 376 */ 377 static char *initpaths[] = { 378 "/sbin/init", 379 "/sbin/oinit", 380 "/sbin/init.bak", 381 NULL, 382 }; 383 384 /* 385 * Start the initial user process; try exec'ing each pathname in "initpaths". 386 * The program is invoked with one argument containing the boot flags. 387 */ 388 static void 389 start_init(p) 390 struct proc *p; 391 { 392 vm_offset_t addr; 393 struct sys_execve_args /* { 394 syscallarg(char *) path; 395 syscallarg(char **) argp; 396 syscallarg(char **) envp; 397 } */ args; 398 int options, i, error; 399 register_t retval[2]; 400 char flags[4], *flagsp; 401 char **pathp, *path, *ucp, **uap, *arg0, *arg1 = NULL; 402 403 /* 404 * Now in process 1. 405 */ 406 initproc = p; 407 408 #ifdef cpu_set_init_frame /* XXX should go away */ 409 /* 410 * We need to set the system call frame as if we were entered through 411 * a syscall() so that when we call sys_execve() below, it will be able 412 * to set the entry point (see setregs) when it tries to exec. The 413 * startup code in "locore.s" has allocated space for the frame and 414 * passed a pointer to that space as main's argument. 415 */ 416 cpu_set_init_frame(p, initframep); 417 #endif 418 419 /* 420 * Need just enough stack to hold the faked-up "execve()" arguments. 421 */ 422 addr = USRSTACK - PAGE_SIZE; 423 if (vm_allocate(&p->p_vmspace->vm_map, &addr, (vm_size_t)PAGE_SIZE, 424 FALSE) != 0) 425 panic("init: couldn't allocate argument space"); 426 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 427 428 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 429 ucp = (char *)(addr + PAGE_SIZE); 430 431 /* 432 * Construct the boot flag argument. 433 */ 434 flagsp = flags; 435 *flagsp++ = '-'; 436 options = 0; 437 438 if (boothowto & RB_SINGLE) { 439 *flagsp++ = 's'; 440 options = 1; 441 } 442 #ifdef notyet 443 if (boothowto & RB_FASTBOOT) { 444 *flagsp++ = 'f'; 445 options = 1; 446 } 447 #endif 448 449 /* 450 * Move out the flags (arg 1), if necessary. 451 */ 452 if (options != 0) { 453 *flagsp++ = '\0'; 454 i = flagsp - flags; 455 #ifdef DEBUG 456 printf("init: copying out flags `%s' %d\n", flags, i); 457 #endif 458 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 459 arg1 = ucp; 460 } 461 462 /* 463 * Move out the file name (also arg 0). 464 */ 465 i = strlen(path) + 1; 466 #ifdef DEBUG 467 printf("init: copying out path `%s' %d\n", path, i); 468 #endif 469 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 470 arg0 = ucp; 471 472 /* 473 * Move out the arg pointers. 474 */ 475 uap = (char **)((long)ucp & ~ALIGNBYTES); 476 (void)suword((caddr_t)--uap, 0); /* terminator */ 477 if (options != 0) 478 (void)suword((caddr_t)--uap, (long)arg1); 479 (void)suword((caddr_t)--uap, (long)arg0); 480 481 /* 482 * Point at the arguments. 483 */ 484 SCARG(&args, path) = arg0; 485 SCARG(&args, argp) = uap; 486 SCARG(&args, envp) = NULL; 487 488 /* 489 * Now try to exec the program. If can't for any reason 490 * other than it doesn't exist, complain. 491 */ 492 if ((error = sys_execve(p, &args, retval)) == 0) 493 return; 494 if (error != ENOENT) 495 printf("exec %s: error %d\n", path, error); 496 } 497 printf("init: not found\n"); 498 panic("no init"); 499 } 500 501 static void 502 start_pagedaemon(p) 503 struct proc *p; 504 { 505 506 /* 507 * Now in process 2. 508 */ 509 pageproc = p; 510 p->p_flag |= P_INMEM | P_SYSTEM; /* XXX */ 511 bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon")); 512 vm_pageout(); 513 /* NOTREACHED */ 514 } 515
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