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 * %sccs.include.redist.c% 11 * 12 * @(#)init_main.c 8.12 (Berkeley) 05/01/95 13 */ 14 15 #include <sys/param.h> 16 #include <sys/filedesc.h> 17 #include <sys/errno.h> 18 #include <sys/exec.h> 19 #include <sys/kernel.h> 20 #include <sys/mount.h> 21 #include <sys/map.h> 22 #include <sys/proc.h> 23 #include <sys/resourcevar.h> 24 #include <sys/signalvar.h> 25 #include <sys/systm.h> 26 #include <sys/vnode.h> 27 #include <sys/conf.h> 28 #include <sys/buf.h> 29 #include <sys/clist.h> 30 #include <sys/device.h> 31 #include <sys/protosw.h> 32 #include <sys/reboot.h> 33 #include <sys/user.h> 34 #include <sys/syscallargs.h> 35 36 #include <ufs/ufs/quota.h> 37 38 #include <machine/cpu.h> 39 40 #include <vm/vm.h> 41 42 #ifdef HPFPLIB 43 char copyright[] = 44 "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"; 45 #else 46 char copyright[] = 47 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n\tThe Regents of the University of California. All rights reserved.\n\n"; 48 #endif 49 50 /* Components of the first process -- never freed. */ 51 struct session session0; 52 struct pgrp pgrp0; 53 struct proc proc0; 54 struct pcred cred0; 55 struct filedesc0 filedesc0; 56 struct plimit limit0; 57 struct vmspace vmspace0; 58 struct proc *curproc = &proc0; 59 struct proc *initproc, *pageproc; 60 61 int cmask = CMASK; 62 extern struct user *proc0paddr; 63 64 struct vnode *rootvp, *swapdev_vp; 65 int boothowto; 66 struct timeval boottime; 67 struct timeval runtime; 68 69 static void start_init __P((struct proc *p, void *framep)); 70 71 /* 72 * System startup; initialize the world, create process 0, mount root 73 * filesystem, and fork to create init and pagedaemon. Most of the 74 * hard work is done in the lower-level initialization routines including 75 * startup(), which does memory initialization and autoconfiguration. 76 */ 77 main(framep) 78 void *framep; 79 { 80 register struct proc *p; 81 register struct filedesc0 *fdp; 82 register struct pdevinit *pdev; 83 register int i; 84 int s; 85 register_t rval[2]; 86 extern int (*mountroot) __P((void)); 87 extern struct pdevinit pdevinit[]; 88 extern void roundrobin __P((void *)); 89 extern void schedcpu __P((void *)); 90 91 /* 92 * Initialize the current process pointer (curproc) before 93 * any possible traps/probes to simplify trap processing. 94 */ 95 p = &proc0; 96 curproc = p; 97 /* 98 * Attempt to find console and initialize 99 * in case of early panic or other messages. 100 */ 101 consinit(); 102 printf(copyright); 103 104 vm_mem_init(); 105 kmeminit(); 106 cpu_startup(); 107 108 /* 109 * Initialize process and pgrp structures. 110 */ 111 procinit(); 112 113 /* 114 * Create process 0 (the swapper). 115 */ 116 LIST_INSERT_HEAD(&allproc, p, p_list); 117 p->p_pgrp = &pgrp0; 118 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 119 LIST_INIT(&pgrp0.pg_members); 120 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 121 122 pgrp0.pg_session = &session0; 123 session0.s_count = 1; 124 session0.s_leader = p; 125 126 p->p_flag = P_INMEM | P_SYSTEM; 127 p->p_stat = SRUN; 128 p->p_nice = NZERO; 129 bcopy("swapper", p->p_comm, sizeof ("swapper")); 130 131 /* Create credentials. */ 132 cred0.p_refcnt = 1; 133 p->p_cred = &cred0; 134 p->p_ucred = crget(); 135 p->p_ucred->cr_ngroups = 1; /* group 0 */ 136 137 /* Create the file descriptor table. */ 138 fdp = &filedesc0; 139 p->p_fd = &fdp->fd_fd; 140 fdp->fd_fd.fd_refcnt = 1; 141 fdp->fd_fd.fd_cmask = cmask; 142 fdp->fd_fd.fd_ofiles = fdp->fd_dfiles; 143 fdp->fd_fd.fd_ofileflags = fdp->fd_dfileflags; 144 fdp->fd_fd.fd_nfiles = NDFILE; 145 146 /* Create the limits structures. */ 147 p->p_limit = &limit0; 148 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 149 limit0.pl_rlimit[i].rlim_cur = 150 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 151 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE; 152 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC; 153 i = ptoa(cnt.v_free_count); 154 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 155 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 156 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 157 limit0.p_refcnt = 1; 158 159 /* Allocate a prototype map so we have something to fork. */ 160 p->p_vmspace = &vmspace0; 161 vmspace0.vm_refcnt = 1; 162 pmap_pinit(&vmspace0.vm_pmap); 163 vm_map_init(&p->p_vmspace->vm_map, round_page(VM_MIN_ADDRESS), 164 trunc_page(VM_MAX_ADDRESS), TRUE); 165 vmspace0.vm_map.pmap = &vmspace0.vm_pmap; 166 p->p_addr = proc0paddr; /* XXX */ 167 168 /* 169 * We continue to place resource usage info and signal 170 * actions in the user struct so they're pageable. 171 */ 172 p->p_stats = &p->p_addr->u_stats; 173 p->p_sigacts = &p->p_addr->u_sigacts; 174 175 /* 176 * Charge root for one process. 177 */ 178 (void)chgproccnt(0, 1); 179 180 rqinit(); 181 182 /* Configure virtual memory system, set vm rlimits. */ 183 vm_init_limits(p); 184 185 /* Initialize the file systems. */ 186 vfsinit(); 187 188 /* Start real time and statistics clocks. */ 189 initclocks(); 190 191 /* Initialize mbuf's. */ 192 mbinit(); 193 194 /* Initialize clists. */ 195 clist_init(); 196 197 #ifdef SYSVSHM 198 /* Initialize System V style shared memory. */ 199 shminit(); 200 #endif 201 202 /* Attach pseudo-devices. */ 203 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 204 (*pdev->pdev_attach)(pdev->pdev_count); 205 206 /* 207 * Initialize protocols. Block reception of incoming packets 208 * until everything is ready. 209 */ 210 s = splimp(); 211 ifinit(); 212 domaininit(); 213 splx(s); 214 215 #ifdef GPROF 216 /* Initialize kernel profiling. */ 217 kmstartup(); 218 #endif 219 220 /* Kick off timeout driven events by calling first time. */ 221 roundrobin(NULL); 222 schedcpu(NULL); 223 224 /* Mount the root file system. */ 225 if ((*mountroot)()) 226 panic("cannot mount root"); 227 228 /* Get the vnode for '/'. Set fdp->fd_fd.fd_cdir to reference it. */ 229 if (VFS_ROOT(mountlist.tqh_first, &rootvnode)) 230 panic("cannot find root vnode"); 231 fdp->fd_fd.fd_cdir = rootvnode; 232 VREF(fdp->fd_fd.fd_cdir); 233 VOP_UNLOCK(rootvnode); 234 fdp->fd_fd.fd_rdir = NULL; 235 swapinit(); 236 237 /* 238 * Now can look at time, having had a chance to verify the time 239 * from the file system. Reset p->p_rtime as it may have been 240 * munched in mi_switch() after the time got set. 241 */ 242 p->p_stats->p_start = runtime = mono_time = boottime = time; 243 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 244 245 /* Initialize signal state for process 0. */ 246 siginit(p); 247 248 /* Create process 1 (init(8)). */ 249 if (fork(p, NULL, rval)) 250 panic("fork init"); 251 if (rval[1]) { 252 start_init(curproc, framep); 253 return; 254 } 255 256 /* Create process 2 (the pageout daemon). */ 257 if (fork(p, NULL, rval)) 258 panic("fork pager"); 259 if (rval[1]) { 260 /* 261 * Now in process 2. 262 */ 263 p = curproc; 264 pageproc = p; 265 p->p_flag |= P_INMEM | P_SYSTEM; /* XXX */ 266 bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon")); 267 vm_pageout(); 268 /* NOTREACHED */ 269 } 270 271 /* The scheduler is an infinite loop. */ 272 scheduler(); 273 /* NOTREACHED */ 274 } 275 276 /* 277 * List of paths to try when searching for "init". 278 */ 279 static char *initpaths[] = { 280 "/sbin/init", 281 "/sbin/oinit", 282 "/sbin/init.bak", 283 NULL, 284 }; 285 286 /* 287 * Start the initial user process; try exec'ing each pathname in "initpaths". 288 * The program is invoked with one argument containing the boot flags. 289 */ 290 static void 291 start_init(p, framep) 292 struct proc *p; 293 void *framep; 294 { 295 vm_offset_t addr; 296 struct execve_args /* { 297 syscallarg(char *) path; 298 syscallarg(char **) argp; 299 syscallarg(char **) envp; 300 } */ args; 301 int options, i, error; 302 register_t retval[2]; 303 char flags[4] = "-", *flagsp; 304 char **pathp, *path, *ucp, **uap, *arg0, *arg1; 305 306 initproc = p; 307 308 /* 309 * We need to set the system call frame as if we were entered through 310 * a syscall() so that when we call execve() below, it will be able 311 * to set the entry point (see setregs) when it tries to exec. The 312 * startup code in "locore.s" has allocated space for the frame and 313 * passed a pointer to that space as main's argument. 314 */ 315 cpu_set_init_frame(p, framep); 316 317 /* 318 * Need just enough stack to hold the faked-up "execve()" arguments. 319 */ 320 addr = trunc_page(VM_MAX_ADDRESS - PAGE_SIZE); 321 if (vm_allocate(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, FALSE) != 0) 322 panic("init: couldn't allocate argument space"); 323 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 324 325 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 326 /* 327 * Construct the boot flag argument. 328 */ 329 options = 0; 330 flagsp = flags + 1; 331 ucp = (char *)USRSTACK; 332 if (boothowto & RB_SINGLE) { 333 *flagsp++ = 's'; 334 options = 1; 335 } 336 #ifdef notyet 337 if (boothowto & RB_FASTBOOT) { 338 *flagsp++ = 'f'; 339 options = 1; 340 } 341 #endif 342 /* 343 * Move out the flags (arg 1), if necessary. 344 */ 345 if (options != 0) { 346 *flagsp++ = '\0'; 347 i = flagsp - flags; 348 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 349 arg1 = ucp; 350 } 351 352 /* 353 * Move out the file name (also arg 0). 354 */ 355 i = strlen(path) + 1; 356 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 357 arg0 = ucp; 358 359 /* 360 * Move out the arg pointers. 361 */ 362 uap = (char **)((long)ucp & ~ALIGNBYTES); 363 (void)suword((caddr_t)--uap, 0); /* terminator */ 364 if (options != 0) 365 (void)suword((caddr_t)--uap, (long)arg1); 366 (void)suword((caddr_t)--uap, (long)arg0); 367 368 /* 369 * Point at the arguments. 370 */ 371 SCARG(&args, path) = arg0; 372 SCARG(&args, argp) = uap; 373 SCARG(&args, envp) = NULL; 374 375 /* 376 * Now try to exec the program. If can't for any reason 377 * other than it doesn't exist, complain. 378 */ 379 if ((error = execve(p, &args, retval)) == 0) 380 return; 381 if (error != ENOENT) 382 printf("exec %s: error %d\n", path, error); 383 } 384 printf("init: not found\n"); 385 panic("no init"); 386 } 387