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1.1 root 1: /*
2: * Copyright (c) 1982, 1986, 1989, 1991 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by the University of
16: * California, Berkeley and its contributors.
17: * 4. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: *
33: * @(#)init_main.c 7.41 (Berkeley) 5/15/91
34: */
35:
36: #include "param.h"
37: #include "filedesc.h"
38: #include "kernel.h"
39: #include "mount.h"
40: #include "map.h"
41: #include "proc.h"
42: #include "resourcevar.h"
43: #include "signalvar.h"
44: #include "systm.h"
45: #include "vnode.h"
46: #include "seg.h"
47: #include "conf.h"
48: #include "buf.h"
49: #include "clist.h"
50: #include "malloc.h"
51: #include "protosw.h"
52: #include "reboot.h"
53: #include "user.h"
54:
55: #include "ufs/quota.h"
56:
57: #include "machine/cpu.h"
58:
59: #include "vm/vm.h"
60:
61: char copyright[] =
62: "Copyright (c) 1982,1986,1989,1991 The Regents of the University of California.\nAll rights reserved.\n\n";
63:
64: /*
65: * Components of process 0;
66: * never freed.
67: */
68: struct session session0;
69: struct pgrp pgrp0;
70: struct proc proc0;
71: struct pcred cred0;
72: struct filedesc0 filedesc0;
73: struct plimit limit0;
74: struct vmspace vmspace0;
75: struct proc *curproc = &proc0;
76: struct proc *initproc, *pageproc;
77:
78: int cmask = CMASK;
79: extern struct user *proc0paddr;
80: extern int (*mountroot)();
81:
82: struct vnode *rootvp, *swapdev_vp;
83: int boothowto;
84:
85: /*
86: * System startup; initialize the world, create process 0,
87: * mount root filesystem, and fork to create init and pagedaemon.
88: * Most of the hard work is done in the lower-level initialization
89: * routines including startup(), which does memory initialization
90: * and autoconfiguration.
91: */
92: main()
93: {
94: register int i;
95: register struct proc *p;
96: register struct filedesc0 *fdp;
97: int s, rval[2];
98:
99: /*
100: * Initialize curproc before any possible traps/probes
101: * to simplify trap processing.
102: */
103: p = &proc0;
104: curproc = p;
105: /*
106: * Attempt to find console and initialize
107: * in case of early panic or other messages.
108: */
109: consinit();
110: printf(copyright);
111:
112: vm_mem_init();
113: kmeminit();
114: cpu_startup();
115:
116: /*
117: * set up system process 0 (swapper)
118: */
119: p = &proc0;
120: curproc = p;
121:
122: allproc = p;
123: p->p_prev = &allproc;
124: p->p_pgrp = &pgrp0;
125: pgrphash[0] = &pgrp0;
126: pgrp0.pg_mem = p;
127: pgrp0.pg_session = &session0;
128: session0.s_count = 1;
129: session0.s_leader = p;
130:
131: p->p_flag = SLOAD|SSYS;
132: p->p_stat = SRUN;
133: p->p_nice = NZERO;
134: bcopy("swapper", p->p_comm, sizeof ("swapper"));
135:
136: /*
137: * Setup credentials
138: */
139: cred0.p_refcnt = 1;
140: p->p_cred = &cred0;
141: p->p_ucred = crget();
142: p->p_ucred->cr_ngroups = 1; /* group 0 */
143:
144: /*
145: * Create the file descriptor table for process 0.
146: */
147: fdp = &filedesc0;
148: p->p_fd = &fdp->fd_fd;
149: fdp->fd_fd.fd_refcnt = 1;
150: fdp->fd_fd.fd_cmask = cmask;
151: fdp->fd_fd.fd_ofiles = fdp->fd_dfiles;
152: fdp->fd_fd.fd_ofileflags = fdp->fd_dfileflags;
153: fdp->fd_fd.fd_nfiles = NDFILE;
154:
155: /*
156: * Set initial limits
157: */
158: p->p_limit = &limit0;
159: for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++)
160: limit0.pl_rlimit[i].rlim_cur =
161: limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY;
162: limit0.pl_rlimit[RLIMIT_OFILE].rlim_cur = NOFILE;
163: limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC;
164: limit0.p_refcnt = 1;
165:
166: /*
167: * Allocate a prototype map so we have something to fork
168: */
169: p->p_vmspace = &vmspace0;
170: vmspace0.vm_refcnt = 1;
171: pmap_pinit(&vmspace0.vm_pmap);
172: vm_map_init(&p->p_vmspace->vm_map, round_page(VM_MIN_ADDRESS),
173: trunc_page(VM_MAX_ADDRESS), TRUE);
174: vmspace0.vm_map.pmap = &vmspace0.vm_pmap;
175: p->p_addr = proc0paddr; /* XXX */
176:
177: /*
178: * We continue to place resource usage info
179: * and signal actions in the user struct so they're pageable.
180: */
181: p->p_stats = &p->p_addr->u_stats;
182: p->p_sigacts = &p->p_addr->u_sigacts;
183:
184: rqinit();
185:
186: /*
187: * configure virtual memory system,
188: * set vm rlimits
189: */
190: vm_init_limits(p);
191:
192: /*
193: * Initialize the file systems.
194: *
195: * Get vnodes for swapdev and rootdev.
196: */
197: vfsinit();
198: if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp))
199: panic("can't setup bdevvp's");
200:
201: startrtclock();
202: #if defined(vax)
203: #include "kg.h"
204: #if NKG > 0
205: startkgclock();
206: #endif
207: #endif
208:
209: /*
210: * Initialize tables, protocols, and set up well-known inodes.
211: */
212: mbinit();
213: cinit();
214: #ifdef SYSVSHM
215: shminit();
216: #endif
217: #include "sl.h"
218: #if NSL > 0
219: slattach(); /* XXX */
220: #endif
221: #include "loop.h"
222: #if NLOOP > 0
223: loattach(); /* XXX */
224: #endif
225: /*
226: * Block reception of incoming packets
227: * until protocols have been initialized.
228: */
229: s = splimp();
230: ifinit();
231: domaininit();
232: splx(s);
233:
234: #ifdef GPROF
235: kmstartup();
236: #endif
237:
238: /* kick off timeout driven events by calling first time */
239: roundrobin();
240: schedcpu();
241: enablertclock(); /* enable realtime clock interrupts */
242:
243: /*
244: * Set up the root file system and vnode.
245: */
246: if ((*mountroot)())
247: panic("cannot mount root");
248: /*
249: * Get vnode for '/'.
250: * Setup rootdir and fdp->fd_fd.fd_cdir to point to it.
251: */
252: if (VFS_ROOT(rootfs, &rootdir))
253: panic("cannot find root vnode");
254: fdp->fd_fd.fd_cdir = rootdir;
255: VREF(fdp->fd_fd.fd_cdir);
256: VOP_UNLOCK(rootdir);
257: fdp->fd_fd.fd_rdir = NULL;
258: swapinit();
259:
260: /*
261: * Now can look at time, having had a chance
262: * to verify the time from the file system.
263: */
264: boottime = p->p_stats->p_start = time;
265:
266: /*
267: * make init process
268: */
269: siginit(p);
270: if (fork(p, (void *) NULL, rval))
271: panic("fork init");
272: if (rval[1]) {
273: static char initflags[] = "-sf";
274: char *ip = initflags + 1;
275: vm_offset_t addr = 0;
276: extern int icode[]; /* user init code */
277: extern int szicode; /* size of icode */
278:
279: /*
280: * Now in process 1. Set init flags into icode,
281: * get a minimal address space, copy out "icode",
282: * and return to it to do an exec of init.
283: */
284: p = curproc;
285: initproc = p;
286: if (boothowto&RB_SINGLE)
287: *ip++ = 's';
288: #ifdef notyet
289: if (boothowto&RB_FASTBOOT)
290: *ip++ = 'f';
291: #endif
292: *ip++ = '\0';
293:
294: if (vm_allocate(&p->p_vmspace->vm_map, &addr,
295: round_page(szicode + sizeof(initflags)), FALSE) != 0 ||
296: addr != 0)
297: panic("init: couldn't allocate at zero");
298:
299: /* need just enough stack to exec from */
300: addr = trunc_page(USRSTACK - PAGE_SIZE);
301: if (vm_allocate(&p->p_vmspace->vm_map, &addr,
302: PAGE_SIZE, FALSE) != KERN_SUCCESS)
303: panic("vm_allocate init stack");
304: p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
305: (void) copyout((caddr_t)icode, (caddr_t)0, (unsigned)szicode);
306: (void) copyout(initflags, (caddr_t)szicode, sizeof(initflags));
307: return; /* returns to icode */
308: }
309:
310: /*
311: * Start up pageout daemon (process 2).
312: */
313: if (fork(p, (void *) NULL, rval))
314: panic("fork pager");
315: if (rval[1]) {
316: /*
317: * Now in process 2.
318: */
319: p = curproc;
320: pageproc = p;
321: p->p_flag |= SLOAD|SSYS; /* XXX */
322: bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon"));
323: vm_pageout();
324: /*NOTREACHED*/
325: }
326:
327: /*
328: * enter scheduling loop
329: */
330: sched();
331: }
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