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