init_main.c revision 1.75
1 /* $NetBSD: init_main.c,v 1.75 1995/03/19 23:27:03 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)init_main.c 8.9 (Berkeley) 1/21/94 41 */ 42 43 #include <sys/param.h> 44 #include <sys/filedesc.h> 45 #include <sys/errno.h> 46 #include <sys/exec.h> 47 #include <sys/kernel.h> 48 #include <sys/mount.h> 49 #include <sys/map.h> 50 #include <sys/proc.h> 51 #include <sys/resourcevar.h> 52 #include <sys/signalvar.h> 53 #include <sys/systm.h> 54 #include <sys/vnode.h> 55 #include <sys/conf.h> 56 #include <sys/buf.h> 57 #ifdef REAL_CLISTS 58 #include <sys/clist.h> 59 #endif 60 #include <sys/device.h> 61 #include <sys/protosw.h> 62 #include <sys/reboot.h> 63 #include <sys/user.h> 64 65 #include <sys/syscallargs.h> 66 67 #include <ufs/ufs/quota.h> 68 69 #include <machine/cpu.h> 70 71 #include <vm/vm.h> 72 73 char copyright[] = 74 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n\tThe Regents of the University of California. All rights reserved.\n\n"; 75 76 /* Components of the first process -- never freed. */ 77 struct session session0; 78 struct pgrp pgrp0; 79 struct proc proc0; 80 struct pcred cred0; 81 struct filedesc0 filedesc0; 82 struct plimit limit0; 83 struct vmspace vmspace0; 84 struct proc *curproc = &proc0; 85 struct proc *initproc, *pageproc; 86 87 int cmask = CMASK; 88 extern struct user *proc0paddr; 89 90 struct vnode *rootvp, *swapdev_vp; 91 int boothowto; 92 struct timeval boottime; 93 struct timeval runtime; 94 95 static void start_init __P((struct proc *p, void *framep)); 96 97 /* 98 * System startup; initialize the world, create process 0, mount root 99 * filesystem, and fork to create init and pagedaemon. Most of the 100 * hard work is done in the lower-level initialization routines including 101 * startup(), which does memory initialization and autoconfiguration. 102 */ 103 int 104 main(framep) 105 void *framep; 106 { 107 register struct proc *p; 108 register struct filedesc0 *fdp; 109 register struct pdevinit *pdev; 110 register int i; 111 int s; 112 register_t rval[2]; 113 extern int (*mountroot) __P((void)); 114 extern struct pdevinit pdevinit[]; 115 extern void roundrobin __P((void *)); 116 extern void schedcpu __P((void *)); 117 118 /* 119 * Initialize the current process pointer (curproc) before 120 * any possible traps/probes to simplify trap processing. 121 */ 122 p = &proc0; 123 curproc = p; 124 /* 125 * Attempt to find console and initialize 126 * in case of early panic or other messages. 127 */ 128 consinit(); 129 printf(copyright); 130 131 vm_mem_init(); 132 kmeminit(); 133 cpu_startup(); 134 135 /* 136 * Initialize process and pgrp structures. 137 */ 138 procinit(); 139 140 /* 141 * Create process 0 (the swapper). 142 */ 143 LIST_INSERT_HEAD(&allproc, p, p_list); 144 p->p_pgrp = &pgrp0; 145 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 146 LIST_INIT(&pgrp0.pg_members); 147 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 148 149 pgrp0.pg_session = &session0; 150 session0.s_count = 1; 151 session0.s_leader = p; 152 153 p->p_flag = P_INMEM | P_SYSTEM; 154 p->p_stat = SRUN; 155 p->p_nice = NZERO; 156 bcopy("swapper", p->p_comm, sizeof ("swapper")); 157 158 /* Create credentials. */ 159 cred0.p_refcnt = 1; 160 p->p_cred = &cred0; 161 p->p_ucred = crget(); 162 p->p_ucred->cr_ngroups = 1; /* group 0 */ 163 164 /* Create the file descriptor table. */ 165 fdp = &filedesc0; 166 p->p_fd = &fdp->fd_fd; 167 fdp->fd_fd.fd_refcnt = 1; 168 fdp->fd_fd.fd_cmask = cmask; 169 fdp->fd_fd.fd_ofiles = fdp->fd_dfiles; 170 fdp->fd_fd.fd_ofileflags = fdp->fd_dfileflags; 171 fdp->fd_fd.fd_nfiles = NDFILE; 172 173 /* Create the limits structures. */ 174 p->p_limit = &limit0; 175 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 176 limit0.pl_rlimit[i].rlim_cur = 177 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 178 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE; 179 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC; 180 i = ptoa(cnt.v_free_count); 181 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 182 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 183 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 184 limit0.p_refcnt = 1; 185 186 /* Allocate a prototype map so we have something to fork. */ 187 p->p_vmspace = &vmspace0; 188 vmspace0.vm_refcnt = 1; 189 pmap_pinit(&vmspace0.vm_pmap); 190 vm_map_init(&p->p_vmspace->vm_map, round_page(VM_MIN_ADDRESS), 191 trunc_page(VM_MAX_ADDRESS), TRUE); 192 vmspace0.vm_map.pmap = &vmspace0.vm_pmap; 193 p->p_addr = proc0paddr; /* XXX */ 194 195 /* 196 * We continue to place resource usage info and signal 197 * actions in the user struct so they're pageable. 198 */ 199 p->p_stats = &p->p_addr->u_stats; 200 p->p_sigacts = &p->p_addr->u_sigacts; 201 202 /* 203 * Charge root for one process. 204 */ 205 (void)chgproccnt(0, 1); 206 207 rqinit(); 208 209 /* Configure virtual memory system, set vm rlimits. */ 210 vm_init_limits(p); 211 212 /* Initialize the file systems. */ 213 vfsinit(); 214 215 /* Start real time and statistics clocks. */ 216 initclocks(); 217 218 /* Initialize mbuf's. */ 219 mbinit(); 220 221 #ifdef REAL_CLISTS 222 /* Initialize clists. */ 223 clist_init(); 224 #endif 225 226 #ifdef SYSVSHM 227 /* Initialize System V style shared memory. */ 228 shminit(); 229 #endif 230 231 #ifdef SYSVSEM 232 /* Initialize System V style semaphores. */ 233 seminit(); 234 #endif 235 236 #ifdef SYSVMSG 237 /* Initialize System V style message queues. */ 238 msginit(); 239 #endif 240 241 /* Attach pseudo-devices. */ 242 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 243 (*pdev->pdev_attach)(pdev->pdev_count); 244 245 /* 246 * Initialize protocols. Block reception of incoming packets 247 * until everything is ready. 248 */ 249 s = splimp(); 250 ifinit(); 251 domaininit(); 252 splx(s); 253 254 #ifdef GPROF 255 /* Initialize kernel profiling. */ 256 kmstartup(); 257 #endif 258 259 /* Kick off timeout driven events by calling first time. */ 260 roundrobin(NULL); 261 schedcpu(NULL); 262 263 /* Mount the root file system. */ 264 if ((*mountroot)()) 265 panic("cannot mount root"); 266 mountlist.cqh_first->mnt_flag |= MNT_ROOTFS; 267 mountlist.cqh_first->mnt_op->vfs_refcount++; 268 269 /* Get the vnode for '/'. Set fdp->fd_fd.fd_cdir to reference it. */ 270 if (VFS_ROOT(mountlist.cqh_first, &rootvnode)) 271 panic("cannot find root vnode"); 272 fdp->fd_fd.fd_cdir = rootvnode; 273 VREF(fdp->fd_fd.fd_cdir); 274 VOP_UNLOCK(rootvnode); 275 fdp->fd_fd.fd_rdir = NULL; 276 swapinit(); 277 278 /* 279 * Now can look at time, having had a chance to verify the time 280 * from the file system. Reset p->p_rtime as it may have been 281 * munched in mi_switch() after the time got set. 282 */ 283 p->p_stats->p_start = runtime = mono_time = boottime = time; 284 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 285 286 /* Initialize signal state for process 0. */ 287 siginit(p); 288 289 /* Create process 1 (init(8)). */ 290 if (fork(p, NULL, rval)) 291 panic("fork init"); 292 if (rval[1]) { 293 start_init(curproc, framep); 294 return; 295 } 296 297 /* Create process 2 (the pageout daemon). */ 298 if (fork(p, NULL, rval)) 299 panic("fork pager"); 300 if (rval[1]) { 301 /* 302 * Now in process 2. 303 */ 304 p = curproc; 305 pageproc = p; 306 p->p_flag |= P_INMEM | P_SYSTEM; /* XXX */ 307 bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon")); 308 vm_pageout(); 309 /* NOTREACHED */ 310 } 311 312 /* The scheduler is an infinite loop. */ 313 scheduler(); 314 /* NOTREACHED */ 315 } 316 317 /* 318 * List of paths to try when searching for "init". 319 */ 320 static char *initpaths[] = { 321 "/sbin/init", 322 "/sbin/oinit", 323 "/sbin/init.bak", 324 NULL, 325 }; 326 327 /* 328 * Start the initial user process; try exec'ing each pathname in "initpaths". 329 * The program is invoked with one argument containing the boot flags. 330 */ 331 static void 332 start_init(p, framep) 333 struct proc *p; 334 void *framep; 335 { 336 vm_offset_t addr; 337 struct execve_args /* { 338 syscallarg(char *) path; 339 syscallarg(char **) argp; 340 syscallarg(char **) envp; 341 } */ args; 342 int options, i, error; 343 register_t retval[2]; 344 char flags[4], *flagsp; 345 char **pathp, *path, *ucp, **uap, *arg0, *arg1; 346 347 initproc = p; 348 349 /* 350 * We need to set the system call frame as if we were entered through 351 * a syscall() so that when we call execve() below, it will be able 352 * to set the entry point (see setregs) when it tries to exec. The 353 * startup code in "locore.s" has allocated space for the frame and 354 * passed a pointer to that space as main's argument. 355 */ 356 cpu_set_init_frame(p, framep); 357 358 /* 359 * Need just enough stack to hold the faked-up "execve()" arguments. 360 */ 361 addr = USRSTACK - PAGE_SIZE; 362 if (vm_allocate(&p->p_vmspace->vm_map, &addr, (vm_size_t)PAGE_SIZE, 363 FALSE) != 0) 364 panic("init: couldn't allocate argument space"); 365 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 366 367 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 368 ucp = (char *)(addr + PAGE_SIZE); 369 370 /* 371 * Construct the boot flag argument. 372 */ 373 flagsp = flags; 374 *flagsp++ = '-'; 375 options = 0; 376 377 if (boothowto & RB_SINGLE) { 378 *flagsp++ = 's'; 379 options = 1; 380 } 381 #ifdef notyet 382 if (boothowto & RB_FASTBOOT) { 383 *flagsp++ = 'f'; 384 options = 1; 385 } 386 #endif 387 388 /* 389 * Move out the flags (arg 1), if necessary. 390 */ 391 if (options != 0) { 392 *flagsp++ = '\0'; 393 i = flagsp - flags; 394 #ifdef DEBUG 395 printf("init: copying out flags `%s' %d\n", flags, i); 396 #endif 397 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 398 arg1 = ucp; 399 } 400 401 /* 402 * Move out the file name (also arg 0). 403 */ 404 i = strlen(path) + 1; 405 #ifdef DEBUG 406 printf("init: copying out path `%s' %d\n", path, i); 407 #endif 408 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 409 arg0 = ucp; 410 411 /* 412 * Move out the arg pointers. 413 */ 414 uap = (char **)((long)ucp & ~ALIGNBYTES); 415 (void)suword((caddr_t)--uap, 0); /* terminator */ 416 if (options != 0) 417 (void)suword((caddr_t)--uap, (long)arg1); 418 (void)suword((caddr_t)--uap, (long)arg0); 419 420 /* 421 * Point at the arguments. 422 */ 423 SCARG(&args, path) = arg0; 424 SCARG(&args, argp) = uap; 425 SCARG(&args, envp) = NULL; 426 427 /* 428 * Now try to exec the program. If can't for any reason 429 * other than it doesn't exist, complain. 430 */ 431 if ((error = execve(p, &args, retval)) == 0) 432 return; 433 if (error != ENOENT) 434 printf("exec %s: error %d\n", path, error); 435 } 436 printf("init: not found\n"); 437 panic("no init"); 438 } 439
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