1 /* 2 * Copyright (c) 1982, 1986, 1989, 1991 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)init_main.c 7.47 (Berkeley) 03/18/92 8 */ 9 10 #include "param.h" 11 #include "filedesc.h" 12 #include "kernel.h" 13 #include "mount.h" 14 #include "map.h" 15 #include "proc.h" 16 #include "resourcevar.h" 17 #include "signalvar.h" 18 #include "systm.h" 19 #include "vnode.h" 20 #include "conf.h" 21 #include "buf.h" 22 #include "clist.h" 23 #include "malloc.h" 24 #include "protosw.h" 25 #include "reboot.h" 26 #include "user.h" 27 28 #include "ufs/ufs/quota.h" 29 30 #include "machine/cpu.h" 31 32 #include "vm/vm.h" 33 34 char copyright[] = 35 "Copyright (c) 1982,1986,1989,1991 The Regents of the University of California.\nAll rights reserved.\n\n"; 36 37 /* 38 * Components of process 0; 39 * never freed. 40 */ 41 struct session session0; 42 struct pgrp pgrp0; 43 struct proc proc0; 44 struct pcred cred0; 45 struct filedesc0 filedesc0; 46 struct plimit limit0; 47 struct vmspace vmspace0; 48 struct proc *curproc = &proc0; 49 struct proc *initproc, *pageproc; 50 51 int cmask = CMASK; 52 extern struct user *proc0paddr; 53 extern int (*mountroot)(); 54 55 struct vnode *rootvp, *swapdev_vp; 56 int boothowto; 57 struct timeval boottime; 58 59 /* 60 * System startup; initialize the world, create process 0, 61 * mount root filesystem, and fork to create init and pagedaemon. 62 * Most of the hard work is done in the lower-level initialization 63 * routines including startup(), which does memory initialization 64 * and autoconfiguration. 65 */ 66 main() 67 { 68 register int i; 69 register struct proc *p; 70 register struct filedesc0 *fdp; 71 int s, rval[2]; 72 73 /* 74 * Initialize curproc before any possible traps/probes 75 * to simplify trap processing. 76 */ 77 p = &proc0; 78 curproc = p; 79 /* 80 * Attempt to find console and initialize 81 * in case of early panic or other messages. 82 */ 83 consinit(); 84 printf(copyright); 85 86 vm_mem_init(); 87 kmeminit(); 88 cpu_startup(); 89 90 /* 91 * set up system process 0 (swapper) 92 */ 93 p = &proc0; 94 curproc = p; 95 96 allproc = p; 97 p->p_prev = &allproc; 98 p->p_pgrp = &pgrp0; 99 pgrphash[0] = &pgrp0; 100 pgrp0.pg_mem = p; 101 pgrp0.pg_session = &session0; 102 session0.s_count = 1; 103 session0.s_leader = p; 104 105 p->p_flag = SLOAD|SSYS; 106 p->p_stat = SRUN; 107 p->p_nice = NZERO; 108 bcopy("swapper", p->p_comm, sizeof ("swapper")); 109 110 /* 111 * Setup credentials 112 */ 113 cred0.p_refcnt = 1; 114 p->p_cred = &cred0; 115 p->p_ucred = crget(); 116 p->p_ucred->cr_ngroups = 1; /* group 0 */ 117 118 /* 119 * Create the file descriptor table for process 0. 120 */ 121 fdp = &filedesc0; 122 p->p_fd = &fdp->fd_fd; 123 fdp->fd_fd.fd_refcnt = 1; 124 fdp->fd_fd.fd_cmask = cmask; 125 fdp->fd_fd.fd_ofiles = fdp->fd_dfiles; 126 fdp->fd_fd.fd_ofileflags = fdp->fd_dfileflags; 127 fdp->fd_fd.fd_nfiles = NDFILE; 128 129 /* 130 * Set initial limits 131 */ 132 p->p_limit = &limit0; 133 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 134 limit0.pl_rlimit[i].rlim_cur = 135 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 136 limit0.pl_rlimit[RLIMIT_OFILE].rlim_cur = NOFILE; 137 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC; 138 limit0.p_refcnt = 1; 139 140 /* 141 * Allocate a prototype map so we have something to fork 142 */ 143 p->p_vmspace = &vmspace0; 144 vmspace0.vm_refcnt = 1; 145 pmap_pinit(&vmspace0.vm_pmap); 146 vm_map_init(&p->p_vmspace->vm_map, round_page(VM_MIN_ADDRESS), 147 trunc_page(VM_MAX_ADDRESS), TRUE); 148 vmspace0.vm_map.pmap = &vmspace0.vm_pmap; 149 p->p_addr = proc0paddr; /* XXX */ 150 151 /* 152 * We continue to place resource usage info 153 * and signal actions in the user struct so they're pageable. 154 */ 155 p->p_stats = &p->p_addr->u_stats; 156 p->p_sigacts = &p->p_addr->u_sigacts; 157 158 rqinit(); 159 160 /* 161 * configure virtual memory system, 162 * set vm rlimits 163 */ 164 vm_init_limits(p); 165 166 /* 167 * Initialize the file systems. 168 * 169 * Get vnodes for swapdev and rootdev. 170 */ 171 vfsinit(); 172 if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp)) 173 panic("can't setup bdevvp's"); 174 175 startrtclock(); 176 #if defined(vax) 177 #include "kg.h" 178 #if NKG > 0 179 startkgclock(); 180 #endif 181 #endif 182 183 /* 184 * Initialize tables, protocols, and set up well-known inodes. 185 */ 186 mbinit(); 187 cinit(); 188 #ifdef SYSVSHM 189 shminit(); 190 #endif 191 #include "sl.h" 192 #if NSL > 0 193 slattach(); /* XXX */ 194 #endif 195 #include "loop.h" 196 #if NLOOP > 0 197 loattach(); /* XXX */ 198 #endif 199 /* 200 * Block reception of incoming packets 201 * until protocols have been initialized. 202 */ 203 s = splimp(); 204 ifinit(); 205 domaininit(); 206 splx(s); 207 208 #ifdef GPROF 209 kmstartup(); 210 #endif 211 212 /* kick off timeout driven events by calling first time */ 213 roundrobin(); 214 schedcpu(); 215 enablertclock(); /* enable realtime clock interrupts */ 216 217 /* 218 * Set up the root file system and vnode. 219 */ 220 if ((*mountroot)()) 221 panic("cannot mount root"); 222 /* 223 * Get vnode for '/'. 224 * Setup rootdir and fdp->fd_fd.fd_cdir to point to it. 225 */ 226 if (VFS_ROOT(rootfs, &rootdir)) 227 panic("cannot find root vnode"); 228 fdp->fd_fd.fd_cdir = rootdir; 229 VREF(fdp->fd_fd.fd_cdir); 230 VOP_UNLOCK(rootdir); 231 fdp->fd_fd.fd_rdir = NULL; 232 swapinit(); 233 234 /* 235 * Now can look at time, having had a chance 236 * to verify the time from the file system. 237 */ 238 mono_time = boottime = p->p_stats->p_start = time; 239 240 /* 241 * make init process 242 */ 243 siginit(p); 244 if (fork(p, NULL, rval)) 245 panic("fork init"); 246 if (rval[1]) { 247 extern int icode[]; /* user init code */ 248 extern int szicode; /* size of icode */ 249 static char initflags[] = "-sf"; 250 vm_offset_t addr; 251 char *ip; 252 253 /* 254 * Now in process 1. Set init flags into icode, get a minimal 255 * address space, copy out "icode", and return to it to do an 256 * exec of init. 257 */ 258 ip = initflags + 1; 259 if (boothowto&RB_SINGLE) 260 *ip++ = 's'; 261 #ifdef notyet 262 if (boothowto&RB_FASTBOOT) 263 *ip++ = 'f'; 264 #endif 265 if (ip == initflags + 1) 266 *ip++ = '-'; 267 *ip++ = '\0'; 268 269 addr = VM_MIN_ADDRESS; 270 initproc = p = curproc; 271 if (vm_allocate(&p->p_vmspace->vm_map, &addr, 272 round_page(szicode + sizeof(initflags)), FALSE) != 0 || 273 addr != VM_MIN_ADDRESS) 274 panic("init: couldn't allocate at zero"); 275 276 /* need just enough stack to exec from */ 277 addr = trunc_page(USRSTACK - PAGE_SIZE); 278 if (vm_allocate(&p->p_vmspace->vm_map, &addr, 279 PAGE_SIZE, FALSE) != KERN_SUCCESS) 280 panic("vm_allocate init stack"); 281 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 282 (void)copyout((caddr_t)icode, (caddr_t)VM_MIN_ADDRESS, 283 (u_int)szicode); 284 (void)copyout(initflags, (caddr_t)(VM_MIN_ADDRESS + szicode), 285 sizeof(initflags)); 286 return; /* returns to icode */ 287 } 288 289 /* 290 * Start up pageout daemon (process 2). 291 */ 292 if (fork(p, NULL, rval)) 293 panic("fork pager"); 294 if (rval[1]) { 295 /* 296 * Now in process 2. 297 */ 298 p = curproc; 299 pageproc = p; 300 p->p_flag |= SLOAD|SSYS; /* XXX */ 301 bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon")); 302 vm_pageout(); 303 /*NOTREACHED*/ 304 } 305 306 /* 307 * enter scheduling loop 308 */ 309 sched(); 310 } 311