1 /* 2 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)init_main.c 8.9 (Berkeley) 1/21/94 39 * $Id: init_main.c,v 1.24 1995/05/14 02:59:55 davidg Exp $ 40 */ 41 42 #include <sys/param.h> 43 #include <sys/filedesc.h> 44 #include <sys/errno.h> 45 #include <sys/exec.h> 46 #include <sys/kernel.h> 47 #ifdef GPROF 48 #include <sys/gmon.h> 49 #endif 50 #include <sys/mount.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/sysent.h> 57 #include <sys/conf.h> 58 #include <sys/buf.h> 59 #include <sys/clist.h> 60 #include <sys/device.h> 61 #include <sys/msg.h> 62 #include <sys/protosw.h> 63 #include <sys/reboot.h> 64 #include <sys/sem.h> 65 #include <sys/shm.h> 66 #include <sys/user.h> 67 68 #include <ufs/ufs/quota.h> 69 70 #include <machine/cpu.h> 71 72 #include <vm/vm.h> 73 #include <vm/vm_pageout.h> 74 75 #ifdef HPFPLIB 76 char copyright[] = 77 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n\tThe Regents of the University of California.\nCopyright (c) 1992 Hewlett-Packard Company\nCopyright (c) 1992 Motorola Inc.\nAll rights reserved.\n\n"; 78 #else 79 char copyright[] = 80 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n\tThe Regents of the University of California. All rights reserved.\n\n"; 81 #endif 82 83 /* Components of the first process -- never freed. */ 84 struct session session0; 85 struct pgrp pgrp0; 86 struct proc proc0; 87 struct pcred cred0; 88 struct filedesc0 filedesc0; 89 struct plimit limit0; 90 struct vmspace vmspace0; 91 struct proc *curproc = &proc0; 92 struct proc *initproc, *pageproc, *updateproc, *vmproc; 93 94 int cmask = CMASK; 95 extern struct user *proc0paddr; 96 97 struct vnode *rootvp; 98 int boothowto; 99 struct timeval boottime; 100 struct timeval runtime; 101 102 static void start_init __P((struct proc *p, void *framep)); 103 104 #if __GNUC__ >= 2 105 void __main() {} 106 #endif 107 108 /* 109 * This table is filled in by the linker with functions that need to be 110 * called to initialize various pseudo-devices and whatnot. 111 */ 112 113 static void dummyinit() {} 114 TEXT_SET(pseudo_set, dummyinit); 115 116 typedef void (*pseudo_func_t)(void); 117 extern const struct linker_set pseudo_set; 118 static const pseudo_func_t *pseudos = 119 (const pseudo_func_t *)&pseudo_set.ls_items[0]; 120 121 /* 122 * System startup; initialize the world, create process 0, mount root 123 * filesystem, and fork to create init and pagedaemon. Most of the 124 * hard work is done in the lower-level initialization routines including 125 * startup(), which does memory initialization and autoconfiguration. 126 */ 127 void 128 main(framep) 129 void *framep; 130 { 131 register struct proc *p; 132 register struct filedesc0 *fdp; 133 register int i; 134 int s, rval[2]; 135 136 /* 137 * Initialize the current process pointer (curproc) before 138 * any possible traps/probes to simplify trap processing. 139 */ 140 p = &proc0; 141 curproc = p; 142 printf(copyright); 143 144 vm_mem_init(); 145 kmeminit(); 146 cpu_startup(); 147 148 /* 149 * Create process 0 (the swapper). 150 */ 151 allproc = (volatile struct proc *)p; 152 p->p_prev = (struct proc **)&allproc; 153 p->p_pgrp = &pgrp0; 154 pgrphash[0] = &pgrp0; 155 pgrp0.pg_mem = p; 156 pgrp0.pg_session = &session0; 157 session0.s_count = 1; 158 session0.s_leader = p; 159 160 p->p_sysent = &aout_sysvec; 161 162 p->p_flag = P_INMEM | P_SYSTEM; 163 p->p_stat = SRUN; 164 p->p_nice = NZERO; 165 p->p_rtprio.type = RTP_PRIO_NORMAL; 166 p->p_rtprio.prio = 0; 167 168 bcopy("swapper", p->p_comm, sizeof ("swapper")); 169 170 /* Create credentials. */ 171 cred0.p_refcnt = 1; 172 p->p_cred = &cred0; 173 p->p_ucred = crget(); 174 p->p_ucred->cr_ngroups = 1; /* group 0 */ 175 176 /* Create the file descriptor table. */ 177 fdp = &filedesc0; 178 p->p_fd = &fdp->fd_fd; 179 fdp->fd_fd.fd_refcnt = 1; 180 fdp->fd_fd.fd_cmask = cmask; 181 fdp->fd_fd.fd_ofiles = fdp->fd_dfiles; 182 fdp->fd_fd.fd_ofileflags = fdp->fd_dfileflags; 183 fdp->fd_fd.fd_nfiles = NDFILE; 184 185 /* Create the limits structures. */ 186 p->p_limit = &limit0; 187 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 188 limit0.pl_rlimit[i].rlim_cur = 189 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 190 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE; 191 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC; 192 i = ptoa(cnt.v_free_count); 193 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 194 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 195 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 196 limit0.p_refcnt = 1; 197 198 /* Allocate a prototype map so we have something to fork. */ 199 p->p_vmspace = &vmspace0; 200 vmspace0.vm_refcnt = 1; 201 pmap_pinit(&vmspace0.vm_pmap); 202 vm_map_init(&vmspace0.vm_map, round_page(VM_MIN_ADDRESS), 203 trunc_page(VM_MAX_ADDRESS), TRUE); 204 vmspace0.vm_map.pmap = &vmspace0.vm_pmap; 205 p->p_addr = proc0paddr; /* XXX */ 206 207 /* 208 * proc0 needs to have a coherent frame base, too. 209 * This probably makes the identical call for the init proc 210 * that happens later unnecessary since it should inherit 211 * it during the fork. 212 */ 213 cpu_set_init_frame(p, framep); /* XXX! */ 214 215 /* 216 * We continue to place resource usage info and signal 217 * actions in the user struct so they're pageable. 218 */ 219 p->p_stats = &p->p_addr->u_stats; 220 p->p_sigacts = &p->p_addr->u_sigacts; 221 222 /* 223 * Initialize per uid information structure and charge 224 * root for one process. 225 */ 226 usrinfoinit(); 227 (void)chgproccnt(0, 1); 228 229 rqinit(); 230 231 /* Configure virtual memory system, set vm rlimits. */ 232 vm_init_limits(p); 233 234 /* Initialize the file systems. */ 235 vfsinit(); 236 237 /* Start real time and statistics clocks. */ 238 initclocks(); 239 240 /* Initialize mbuf's. */ 241 mbinit(); 242 243 /* Initialize clists. */ 244 clist_init(); 245 246 #ifdef SYSVSHM 247 /* Initialize System V style shared memory. */ 248 shminit(); 249 #endif 250 251 #ifdef SYSVSEM 252 /* Initialize System V style semaphores. */ 253 seminit(); 254 #endif 255 256 #ifdef SYSVMSG 257 /* Initialize System V style message queues. */ 258 msginit(); 259 #endif 260 261 /* 262 * Attach pseudo-devices. 263 */ 264 while(*pseudos) { 265 (**pseudos++)(); 266 } 267 268 /* 269 * Initialize protocols. Block reception of incoming packets 270 * until everything is ready. 271 */ 272 s = splimp(); 273 ifinit(); 274 domaininit(); 275 splx(s); 276 277 #ifdef GPROF 278 /* Initialize kernel profiling. */ 279 kmstartup(); 280 #endif 281 282 /* Kick off timeout driven events by calling first time. */ 283 roundrobin(NULL); 284 schedcpu(NULL); 285 286 /* Mount the root file system. */ 287 if ((*mountroot)()) 288 panic("cannot mount root"); 289 290 /* Get the vnode for '/'. Set fdp->fd_fd.fd_cdir to reference it. */ 291 if (VFS_ROOT(mountlist.tqh_first, &rootvnode)) 292 panic("cannot find root vnode"); 293 fdp->fd_fd.fd_cdir = rootvnode; 294 VREF(fdp->fd_fd.fd_cdir); 295 VOP_UNLOCK(rootvnode); 296 fdp->fd_fd.fd_rdir = NULL; 297 298 /* 299 * Now can look at time, having had a chance to verify the time 300 * from the file system. Reset p->p_rtime as it may have been 301 * munched in mi_switch() after the time got set. 302 */ 303 p->p_stats->p_start = runtime = mono_time = boottime = time; 304 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 305 306 /* Initialize signal state for process 0. */ 307 siginit(p); 308 309 /* Create process 1 (init(8)). */ 310 if (fork(p, NULL, rval)) 311 panic("fork init"); 312 if (rval[1]) { 313 start_init(curproc, framep); 314 return; 315 } 316 317 /* Create process 2 (the pageout daemon). */ 318 if (fork(p, NULL, rval)) 319 panic("fork pager"); 320 if (rval[1]) { 321 /* 322 * Now in process 2. 323 */ 324 p = curproc; 325 pageproc = p; 326 p->p_flag |= P_INMEM | P_SYSTEM; /* XXX */ 327 bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon")); 328 vm_pageout(); 329 /* NOTREACHED */ 330 } 331 332 /* 333 * Start high level vm daemon (process 3). 334 */ 335 if (fork(p, (void *) NULL, rval)) 336 panic("failed fork vm daemon"); 337 if (rval[1]) { 338 p = curproc; 339 vmproc = p; 340 p->p_flag |= P_INMEM | P_SYSTEM; 341 bcopy("vmdaemon", p->p_comm, sizeof("vmdaemon")); 342 vm_daemon(); 343 /*NOTREACHED*/ 344 } 345 346 /* 347 * Start update daemon (process 4). 348 */ 349 if (fork(p, (void *) NULL, rval)) 350 panic("failed fork update daemon"); 351 if (rval[1]) { 352 p = curproc; 353 updateproc = p; 354 p->p_flag |= P_INMEM | P_SYSTEM; 355 bcopy("update", p->p_comm, sizeof("update")); 356 vfs_update(); 357 /*NOTREACHED*/ 358 } 359 360 /* The scheduler is an infinite loop. */ 361 scheduler(); 362 /* NOTREACHED */ 363 } 364 365 /* 366 * List of paths to try when searching for "init". 367 */ 368 static char *initpaths[] = { 369 "/sbin/init", 370 "/sbin/oinit", 371 "/sbin/init.bak", 372 "/stand/sysinstall", 373 NULL, 374 }; 375 376 /* 377 * Start the initial user process; try exec'ing each pathname in "initpaths". 378 * The program is invoked with one argument containing the boot flags. 379 */ 380 static void 381 start_init(p, framep) 382 struct proc *p; 383 void *framep; 384 { 385 vm_offset_t addr; 386 struct execve_args args; 387 int options, i, retval[2], error; 388 char **pathp, *path, *ucp, **uap, *arg0, *arg1; 389 390 initproc = p; 391 392 /* 393 * We need to set the system call frame as if we were entered through 394 * a syscall() so that when we call execve() below, it will be able 395 * to set the entry point (see setregs) when it tries to exec. The 396 * startup code in "locore.s" has allocated space for the frame and 397 * passed a pointer to that space as main's argument. 398 */ 399 cpu_set_init_frame(p, framep); 400 401 /* 402 * Need just enough stack to hold the faked-up "execve()" arguments. 403 */ 404 addr = trunc_page(VM_MAXUSER_ADDRESS - PAGE_SIZE); 405 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, FALSE) != 0) 406 panic("init: couldn't allocate argument space"); 407 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 408 p->p_vmspace->vm_ssize = 1; 409 410 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 411 /* 412 * Move out the boot flag argument. 413 */ 414 options = 0; 415 ucp = (char *)USRSTACK; 416 (void)subyte(--ucp, 0); /* trailing zero */ 417 if (boothowto & RB_SINGLE) { 418 (void)subyte(--ucp, 's'); 419 options = 1; 420 } 421 #ifdef notyet 422 if (boothowto & RB_FASTBOOT) { 423 (void)subyte(--ucp, 'f'); 424 options = 1; 425 } 426 #endif 427 428 #ifdef BOOTCDROM 429 (void)subyte(--ucp, 'C'); 430 options = 1; 431 #endif 432 if (options == 0) 433 (void)subyte(--ucp, '-'); 434 (void)subyte(--ucp, '-'); /* leading hyphen */ 435 arg1 = ucp; 436 437 /* 438 * Move out the file name (also arg 0). 439 */ 440 for (i = strlen(path) + 1; i >= 0; i--) 441 (void)subyte(--ucp, path[i]); 442 arg0 = ucp; 443 444 /* 445 * Move out the arg pointers. 446 */ 447 uap = (char **)((int)ucp & ~(NBPW-1)); 448 (void)suword((caddr_t)--uap, 0); /* terminator */ 449 (void)suword((caddr_t)--uap, (int)arg1); 450 (void)suword((caddr_t)--uap, (int)arg0); 451 452 /* 453 * Point at the arguments. 454 */ 455 args.fname = arg0; 456 args.argv = uap; 457 args.envv = NULL; 458 459 /* 460 * Now try to exec the program. If can't for any reason 461 * other than it doesn't exist, complain. 462 */ 463 if ((error = execve(p, &args, &retval[0])) == 0) 464 return; 465 if (error != ENOENT) 466 printf("exec %s: error %d\n", path, error); 467 } 468 printf("init: not found\n"); 469 panic("no init"); 470 } 471