init_main.c revision 1.78
1 /* $NetBSD: init_main.c,v 1.78 1995/10/07 06:28:05 mycroft 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 66 #include <sys/syscall.h> 67 #include <sys/syscallargs.h> 68 69 #include <ufs/ufs/quota.h> 70 71 #include <machine/cpu.h> 72 73 #include <vm/vm.h> 74 75 char copyright[] = 76 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n\tThe Regents of the University of California. All rights reserved.\n\n"; 77 78 /* Components of the first process -- never freed. */ 79 struct session session0; 80 struct pgrp pgrp0; 81 struct proc proc0; 82 struct pcred cred0; 83 struct filedesc0 filedesc0; 84 struct plimit limit0; 85 struct vmspace vmspace0; 86 struct proc *curproc = &proc0; 87 struct proc *initproc, *pageproc; 88 89 int cmask = CMASK; 90 extern struct user *proc0paddr; 91 92 struct vnode *rootvp, *swapdev_vp; 93 int boothowto; 94 struct timeval boottime; 95 struct timeval runtime; 96 97 static void start_init __P((struct proc *)); 98 static void start_pagedaemon __P((struct proc *)); 99 100 #ifdef cpu_set_init_frame 101 void *initframep; /* XXX should go away */ 102 #endif 103 104 extern char sigcode[], esigcode[]; 105 #ifdef SYSCALL_DEBUG 106 extern char *syscallnames[]; 107 #endif 108 109 struct emul emul_netbsd = { 110 "netbsd", 111 NULL, 112 sendsig, 113 SYS_syscall, 114 SYS_MAXSYSCALL, 115 sysent, 116 #ifdef SYSCALL_DEBUG 117 syscallnames, 118 #else 119 NULL, 120 #endif 121 0, 122 copyargs, 123 setregs, 124 sigcode, 125 esigcode, 126 }; 127 128 /* 129 * System startup; initialize the world, create process 0, mount root 130 * filesystem, and fork to create init and pagedaemon. Most of the 131 * hard work is done in the lower-level initialization routines including 132 * startup(), which does memory initialization and autoconfiguration. 133 */ 134 int 135 main(framep) 136 void *framep; /* XXX should go away */ 137 { 138 register struct proc *p; 139 register struct filedesc0 *fdp; 140 register struct pdevinit *pdev; 141 register int i; 142 int s; 143 register_t rval[2]; 144 extern int (*mountroot) __P((void)); 145 extern struct pdevinit pdevinit[]; 146 extern void roundrobin __P((void *)); 147 extern void schedcpu __P((void *)); 148 149 /* 150 * Initialize the current process pointer (curproc) before 151 * any possible traps/probes to simplify trap processing. 152 */ 153 p = &proc0; 154 curproc = p; 155 /* 156 * Attempt to find console and initialize 157 * in case of early panic or other messages. 158 */ 159 consinit(); 160 printf(copyright); 161 162 vm_mem_init(); 163 kmeminit(); 164 cpu_startup(); 165 166 /* 167 * Initialize process and pgrp structures. 168 */ 169 procinit(); 170 171 /* 172 * Create process 0 (the swapper). 173 */ 174 LIST_INSERT_HEAD(&allproc, p, p_list); 175 p->p_pgrp = &pgrp0; 176 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 177 LIST_INIT(&pgrp0.pg_members); 178 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 179 180 pgrp0.pg_session = &session0; 181 session0.s_count = 1; 182 session0.s_leader = p; 183 184 p->p_flag = P_INMEM | P_SYSTEM; 185 p->p_stat = SRUN; 186 p->p_nice = NZERO; 187 p->p_emul = &emul_netbsd; 188 bcopy("swapper", p->p_comm, sizeof ("swapper")); 189 190 /* Create credentials. */ 191 cred0.p_refcnt = 1; 192 p->p_cred = &cred0; 193 p->p_ucred = crget(); 194 p->p_ucred->cr_ngroups = 1; /* group 0 */ 195 196 /* Create the file descriptor table. */ 197 fdp = &filedesc0; 198 p->p_fd = &fdp->fd_fd; 199 fdp->fd_fd.fd_refcnt = 1; 200 fdp->fd_fd.fd_cmask = cmask; 201 fdp->fd_fd.fd_ofiles = fdp->fd_dfiles; 202 fdp->fd_fd.fd_ofileflags = fdp->fd_dfileflags; 203 fdp->fd_fd.fd_nfiles = NDFILE; 204 205 /* Create the limits structures. */ 206 p->p_limit = &limit0; 207 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 208 limit0.pl_rlimit[i].rlim_cur = 209 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 210 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE; 211 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC; 212 i = ptoa(cnt.v_free_count); 213 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 214 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 215 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 216 limit0.p_refcnt = 1; 217 218 /* Allocate a prototype map so we have something to fork. */ 219 p->p_vmspace = &vmspace0; 220 vmspace0.vm_refcnt = 1; 221 pmap_pinit(&vmspace0.vm_pmap); 222 vm_map_init(&p->p_vmspace->vm_map, round_page(VM_MIN_ADDRESS), 223 trunc_page(VM_MAX_ADDRESS), TRUE); 224 vmspace0.vm_map.pmap = &vmspace0.vm_pmap; 225 p->p_addr = proc0paddr; /* XXX */ 226 227 /* 228 * We continue to place resource usage info and signal 229 * actions in the user struct so they're pageable. 230 */ 231 p->p_stats = &p->p_addr->u_stats; 232 p->p_sigacts = &p->p_addr->u_sigacts; 233 234 /* 235 * Charge root for one process. 236 */ 237 (void)chgproccnt(0, 1); 238 239 rqinit(); 240 241 /* Configure virtual memory system, set vm rlimits. */ 242 vm_init_limits(p); 243 244 /* Initialize the file systems. */ 245 vfsinit(); 246 247 /* Start real time and statistics clocks. */ 248 initclocks(); 249 250 /* Initialize mbuf's. */ 251 mbinit(); 252 253 #ifdef REAL_CLISTS 254 /* Initialize clists. */ 255 clist_init(); 256 #endif 257 258 #ifdef SYSVSHM 259 /* Initialize System V style shared memory. */ 260 shminit(); 261 #endif 262 263 #ifdef SYSVSEM 264 /* Initialize System V style semaphores. */ 265 seminit(); 266 #endif 267 268 #ifdef SYSVMSG 269 /* Initialize System V style message queues. */ 270 msginit(); 271 #endif 272 273 /* Attach pseudo-devices. */ 274 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 275 (*pdev->pdev_attach)(pdev->pdev_count); 276 277 /* 278 * Initialize protocols. Block reception of incoming packets 279 * until everything is ready. 280 */ 281 s = splimp(); 282 ifinit(); 283 domaininit(); 284 splx(s); 285 286 #ifdef GPROF 287 /* Initialize kernel profiling. */ 288 kmstartup(); 289 #endif 290 291 /* Kick off timeout driven events by calling first time. */ 292 roundrobin(NULL); 293 schedcpu(NULL); 294 295 /* Mount the root file system. */ 296 if ((*mountroot)()) 297 panic("cannot mount root"); 298 mountlist.cqh_first->mnt_flag |= MNT_ROOTFS; 299 mountlist.cqh_first->mnt_op->vfs_refcount++; 300 301 /* Get the vnode for '/'. Set fdp->fd_fd.fd_cdir to reference it. */ 302 if (VFS_ROOT(mountlist.cqh_first, &rootvnode)) 303 panic("cannot find root vnode"); 304 fdp->fd_fd.fd_cdir = rootvnode; 305 VREF(fdp->fd_fd.fd_cdir); 306 VOP_UNLOCK(rootvnode); 307 fdp->fd_fd.fd_rdir = NULL; 308 swapinit(); 309 310 /* 311 * Now can look at time, having had a chance to verify the time 312 * from the file system. Reset p->p_rtime as it may have been 313 * munched in mi_switch() after the time got set. 314 */ 315 p->p_stats->p_start = runtime = mono_time = boottime = time; 316 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 317 318 /* Initialize signal state for process 0. */ 319 siginit(p); 320 321 /* Create process 1 (init(8)). */ 322 if (sys_fork(p, NULL, rval)) 323 panic("fork init"); 324 #ifdef cpu_set_init_frame /* XXX should go away */ 325 if (rval[1]) { 326 /* 327 * Now in process 1. 328 */ 329 initframep = framep; 330 start_init(curproc); 331 return; 332 } 333 #else 334 cpu_set_kpc(pfind(1), start_init); 335 #endif 336 337 /* Create process 2 (the pageout daemon). */ 338 if (sys_fork(p, NULL, rval)) 339 panic("fork pager"); 340 #ifdef cpu_set_init_frame /* XXX should go away */ 341 if (rval[1]) { 342 /* 343 * Now in process 2. 344 */ 345 start_pagedaemon(curproc); 346 } 347 #else 348 cpu_set_kpc(pfind(2), start_pagedaemon); 349 #endif 350 351 /* The scheduler is an infinite loop. */ 352 scheduler(); 353 /* NOTREACHED */ 354 } 355 356 /* 357 * List of paths to try when searching for "init". 358 */ 359 static char *initpaths[] = { 360 "/sbin/init", 361 "/sbin/oinit", 362 "/sbin/init.bak", 363 NULL, 364 }; 365 366 /* 367 * Start the initial user process; try exec'ing each pathname in "initpaths". 368 * The program is invoked with one argument containing the boot flags. 369 */ 370 static void 371 start_init(p) 372 struct proc *p; 373 { 374 vm_offset_t addr; 375 struct sys_execve_args /* { 376 syscallarg(char *) path; 377 syscallarg(char **) argp; 378 syscallarg(char **) envp; 379 } */ args; 380 int options, i, error; 381 register_t retval[2]; 382 char flags[4], *flagsp; 383 char **pathp, *path, *ucp, **uap, *arg0, *arg1; 384 385 /* 386 * Now in process 1. 387 */ 388 initproc = p; 389 390 #ifdef cpu_set_init_frame /* XXX should go away */ 391 /* 392 * We need to set the system call frame as if we were entered through 393 * a syscall() so that when we call sys_execve() below, it will be able 394 * to set the entry point (see setregs) when it tries to exec. The 395 * startup code in "locore.s" has allocated space for the frame and 396 * passed a pointer to that space as main's argument. 397 */ 398 cpu_set_init_frame(p, initframep); 399 #endif 400 401 /* 402 * Need just enough stack to hold the faked-up "execve()" arguments. 403 */ 404 addr = USRSTACK - PAGE_SIZE; 405 if (vm_allocate(&p->p_vmspace->vm_map, &addr, (vm_size_t)PAGE_SIZE, 406 FALSE) != 0) 407 panic("init: couldn't allocate argument space"); 408 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 409 410 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 411 ucp = (char *)(addr + PAGE_SIZE); 412 413 /* 414 * Construct the boot flag argument. 415 */ 416 flagsp = flags; 417 *flagsp++ = '-'; 418 options = 0; 419 420 if (boothowto & RB_SINGLE) { 421 *flagsp++ = 's'; 422 options = 1; 423 } 424 #ifdef notyet 425 if (boothowto & RB_FASTBOOT) { 426 *flagsp++ = 'f'; 427 options = 1; 428 } 429 #endif 430 431 /* 432 * Move out the flags (arg 1), if necessary. 433 */ 434 if (options != 0) { 435 *flagsp++ = '\0'; 436 i = flagsp - flags; 437 #ifdef DEBUG 438 printf("init: copying out flags `%s' %d\n", flags, i); 439 #endif 440 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 441 arg1 = ucp; 442 } 443 444 /* 445 * Move out the file name (also arg 0). 446 */ 447 i = strlen(path) + 1; 448 #ifdef DEBUG 449 printf("init: copying out path `%s' %d\n", path, i); 450 #endif 451 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 452 arg0 = ucp; 453 454 /* 455 * Move out the arg pointers. 456 */ 457 uap = (char **)((long)ucp & ~ALIGNBYTES); 458 (void)suword((caddr_t)--uap, 0); /* terminator */ 459 if (options != 0) 460 (void)suword((caddr_t)--uap, (long)arg1); 461 (void)suword((caddr_t)--uap, (long)arg0); 462 463 /* 464 * Point at the arguments. 465 */ 466 SCARG(&args, path) = arg0; 467 SCARG(&args, argp) = uap; 468 SCARG(&args, envp) = NULL; 469 470 /* 471 * Now try to exec the program. If can't for any reason 472 * other than it doesn't exist, complain. 473 */ 474 if ((error = sys_execve(p, &args, retval)) == 0) 475 return; 476 if (error != ENOENT) 477 printf("exec %s: error %d\n", path, error); 478 } 479 printf("init: not found\n"); 480 panic("no init"); 481 } 482 483 static void 484 start_pagedaemon(p) 485 struct proc *p; 486 { 487 488 /* 489 * Now in process 2. 490 */ 491 pageproc = p; 492 p->p_flag |= P_INMEM | P_SYSTEM; /* XXX */ 493 bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon")); 494 vm_pageout(); 495 /* NOTREACHED */ 496 } 497
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