init_main.c revision 1.79
1 /* $NetBSD: init_main.c,v 1.79 1995/12/09 04:07:41 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 pdevinit *pdev; 140 register int i; 141 int s; 142 register_t rval[2]; 143 extern int (*mountroot) __P((void)); 144 extern struct pdevinit pdevinit[]; 145 extern void roundrobin __P((void *)); 146 extern void schedcpu __P((void *)); 147 148 /* 149 * Initialize the current process pointer (curproc) before 150 * any possible traps/probes to simplify trap processing. 151 */ 152 p = &proc0; 153 curproc = p; 154 /* 155 * Attempt to find console and initialize 156 * in case of early panic or other messages. 157 */ 158 consinit(); 159 printf(copyright); 160 161 vm_mem_init(); 162 kmeminit(); 163 cpu_startup(); 164 165 /* 166 * Initialize process and pgrp structures. 167 */ 168 procinit(); 169 170 /* 171 * Create process 0 (the swapper). 172 */ 173 LIST_INSERT_HEAD(&allproc, p, p_list); 174 p->p_pgrp = &pgrp0; 175 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 176 LIST_INIT(&pgrp0.pg_members); 177 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 178 179 pgrp0.pg_session = &session0; 180 session0.s_count = 1; 181 session0.s_leader = p; 182 183 p->p_flag = P_INMEM | P_SYSTEM; 184 p->p_stat = SRUN; 185 p->p_nice = NZERO; 186 p->p_emul = &emul_netbsd; 187 bcopy("swapper", p->p_comm, sizeof ("swapper")); 188 189 /* Create credentials. */ 190 cred0.p_refcnt = 1; 191 p->p_cred = &cred0; 192 p->p_ucred = crget(); 193 p->p_ucred->cr_ngroups = 1; /* group 0 */ 194 195 /* Create the file descriptor table. */ 196 p->p_fd = &filedesc0.fd_fd; 197 filedesc0.fd_fd.fd_refcnt = 1; 198 filedesc0.fd_fd.fd_cmask = cmask; 199 filedesc0.fd_fd.fd_ofiles = filedesc0.fd_dfiles; 200 filedesc0.fd_fd.fd_ofileflags = filedesc0.fd_dfileflags; 201 filedesc0.fd_fd.fd_nfiles = NDFILE; 202 203 /* Create the limits structures. */ 204 p->p_limit = &limit0; 205 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 206 limit0.pl_rlimit[i].rlim_cur = 207 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 208 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE; 209 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC; 210 i = ptoa(cnt.v_free_count); 211 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 212 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 213 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 214 limit0.p_refcnt = 1; 215 216 /* Allocate a prototype map so we have something to fork. */ 217 p->p_vmspace = &vmspace0; 218 vmspace0.vm_refcnt = 1; 219 pmap_pinit(&vmspace0.vm_pmap); 220 vm_map_init(&p->p_vmspace->vm_map, round_page(VM_MIN_ADDRESS), 221 trunc_page(VM_MAX_ADDRESS), TRUE); 222 vmspace0.vm_map.pmap = &vmspace0.vm_pmap; 223 p->p_addr = proc0paddr; /* XXX */ 224 225 /* 226 * We continue to place resource usage info and signal 227 * actions in the user struct so they're pageable. 228 */ 229 p->p_stats = &p->p_addr->u_stats; 230 p->p_sigacts = &p->p_addr->u_sigacts; 231 232 /* 233 * Charge root for one process. 234 */ 235 (void)chgproccnt(0, 1); 236 237 rqinit(); 238 239 /* Configure virtual memory system, set vm rlimits. */ 240 vm_init_limits(p); 241 242 /* Initialize the file systems. */ 243 vfsinit(); 244 245 /* Start real time and statistics clocks. */ 246 initclocks(); 247 248 /* Initialize mbuf's. */ 249 mbinit(); 250 251 #ifdef REAL_CLISTS 252 /* Initialize clists. */ 253 clist_init(); 254 #endif 255 256 #ifdef SYSVSHM 257 /* Initialize System V style shared memory. */ 258 shminit(); 259 #endif 260 261 #ifdef SYSVSEM 262 /* Initialize System V style semaphores. */ 263 seminit(); 264 #endif 265 266 #ifdef SYSVMSG 267 /* Initialize System V style message queues. */ 268 msginit(); 269 #endif 270 271 /* Attach pseudo-devices. */ 272 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 273 (*pdev->pdev_attach)(pdev->pdev_count); 274 275 /* 276 * Initialize protocols. Block reception of incoming packets 277 * until everything is ready. 278 */ 279 s = splimp(); 280 ifinit(); 281 domaininit(); 282 splx(s); 283 284 #ifdef GPROF 285 /* Initialize kernel profiling. */ 286 kmstartup(); 287 #endif 288 289 /* Kick off timeout driven events by calling first time. */ 290 roundrobin(NULL); 291 schedcpu(NULL); 292 293 /* Mount the root file system. */ 294 if ((*mountroot)()) 295 panic("cannot mount root"); 296 mountlist.cqh_first->mnt_flag |= MNT_ROOTFS; 297 mountlist.cqh_first->mnt_op->vfs_refcount++; 298 299 /* Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to reference it. */ 300 if (VFS_ROOT(mountlist.cqh_first, &rootvnode)) 301 panic("cannot find root vnode"); 302 filedesc0.fd_fd.fd_cdir = rootvnode; 303 VREF(filedesc0.fd_fd.fd_cdir); 304 VOP_UNLOCK(rootvnode); 305 filedesc0.fd_fd.fd_rdir = NULL; 306 swapinit(); 307 308 /* 309 * Now can look at time, having had a chance to verify the time 310 * from the file system. Reset p->p_rtime as it may have been 311 * munched in mi_switch() after the time got set. 312 */ 313 p->p_stats->p_start = runtime = mono_time = boottime = time; 314 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 315 316 /* Initialize signal state for process 0. */ 317 siginit(p); 318 319 /* Create process 1 (init(8)). */ 320 if (sys_fork(p, NULL, rval)) 321 panic("fork init"); 322 #ifdef cpu_set_init_frame /* XXX should go away */ 323 if (rval[1]) { 324 /* 325 * Now in process 1. 326 */ 327 initframep = framep; 328 start_init(curproc); 329 return; 330 } 331 #else 332 cpu_set_kpc(pfind(1), start_init); 333 #endif 334 335 /* Create process 2 (the pageout daemon). */ 336 if (sys_fork(p, NULL, rval)) 337 panic("fork pager"); 338 #ifdef cpu_set_init_frame /* XXX should go away */ 339 if (rval[1]) { 340 /* 341 * Now in process 2. 342 */ 343 start_pagedaemon(curproc); 344 } 345 #else 346 cpu_set_kpc(pfind(2), start_pagedaemon); 347 #endif 348 349 /* The scheduler is an infinite loop. */ 350 scheduler(); 351 /* NOTREACHED */ 352 } 353 354 /* 355 * List of paths to try when searching for "init". 356 */ 357 static char *initpaths[] = { 358 "/sbin/init", 359 "/sbin/oinit", 360 "/sbin/init.bak", 361 NULL, 362 }; 363 364 /* 365 * Start the initial user process; try exec'ing each pathname in "initpaths". 366 * The program is invoked with one argument containing the boot flags. 367 */ 368 static void 369 start_init(p) 370 struct proc *p; 371 { 372 vm_offset_t addr; 373 struct sys_execve_args /* { 374 syscallarg(char *) path; 375 syscallarg(char **) argp; 376 syscallarg(char **) envp; 377 } */ args; 378 int options, i, error; 379 register_t retval[2]; 380 char flags[4], *flagsp; 381 char **pathp, *path, *ucp, **uap, *arg0, *arg1; 382 383 /* 384 * Now in process 1. 385 */ 386 initproc = p; 387 388 #ifdef cpu_set_init_frame /* XXX should go away */ 389 /* 390 * We need to set the system call frame as if we were entered through 391 * a syscall() so that when we call sys_execve() below, it will be able 392 * to set the entry point (see setregs) when it tries to exec. The 393 * startup code in "locore.s" has allocated space for the frame and 394 * passed a pointer to that space as main's argument. 395 */ 396 cpu_set_init_frame(p, initframep); 397 #endif 398 399 /* 400 * Need just enough stack to hold the faked-up "execve()" arguments. 401 */ 402 addr = USRSTACK - PAGE_SIZE; 403 if (vm_allocate(&p->p_vmspace->vm_map, &addr, (vm_size_t)PAGE_SIZE, 404 FALSE) != 0) 405 panic("init: couldn't allocate argument space"); 406 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 407 408 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 409 ucp = (char *)(addr + PAGE_SIZE); 410 411 /* 412 * Construct the boot flag argument. 413 */ 414 flagsp = flags; 415 *flagsp++ = '-'; 416 options = 0; 417 418 if (boothowto & RB_SINGLE) { 419 *flagsp++ = 's'; 420 options = 1; 421 } 422 #ifdef notyet 423 if (boothowto & RB_FASTBOOT) { 424 *flagsp++ = 'f'; 425 options = 1; 426 } 427 #endif 428 429 /* 430 * Move out the flags (arg 1), if necessary. 431 */ 432 if (options != 0) { 433 *flagsp++ = '\0'; 434 i = flagsp - flags; 435 #ifdef DEBUG 436 printf("init: copying out flags `%s' %d\n", flags, i); 437 #endif 438 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 439 arg1 = ucp; 440 } 441 442 /* 443 * Move out the file name (also arg 0). 444 */ 445 i = strlen(path) + 1; 446 #ifdef DEBUG 447 printf("init: copying out path `%s' %d\n", path, i); 448 #endif 449 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 450 arg0 = ucp; 451 452 /* 453 * Move out the arg pointers. 454 */ 455 uap = (char **)((long)ucp & ~ALIGNBYTES); 456 (void)suword((caddr_t)--uap, 0); /* terminator */ 457 if (options != 0) 458 (void)suword((caddr_t)--uap, (long)arg1); 459 (void)suword((caddr_t)--uap, (long)arg0); 460 461 /* 462 * Point at the arguments. 463 */ 464 SCARG(&args, path) = arg0; 465 SCARG(&args, argp) = uap; 466 SCARG(&args, envp) = NULL; 467 468 /* 469 * Now try to exec the program. If can't for any reason 470 * other than it doesn't exist, complain. 471 */ 472 if ((error = sys_execve(p, &args, retval)) == 0) 473 return; 474 if (error != ENOENT) 475 printf("exec %s: error %d\n", path, error); 476 } 477 printf("init: not found\n"); 478 panic("no init"); 479 } 480 481 static void 482 start_pagedaemon(p) 483 struct proc *p; 484 { 485 486 /* 487 * Now in process 2. 488 */ 489 pageproc = p; 490 p->p_flag |= P_INMEM | P_SYSTEM; /* XXX */ 491 bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon")); 492 vm_pageout(); 493 /* NOTREACHED */ 494 } 495
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