usr/src/sys/kern/init_main.c

/*
 * Copyright (c) 1982, 1986, 1989, 1991 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)init_main.c	7.49 (Berkeley) %G%
 */

#include "param.h"
#include "filedesc.h"
#include "kernel.h"
#include "mount.h"
#include "map.h"
#include "proc.h"
#include "resourcevar.h"
#include "signalvar.h"
#include "systm.h"
#include "vnode.h"
#include "conf.h"
#include "buf.h"
#include "clist.h"
#include "malloc.h"
#include "protosw.h"
#include "reboot.h"
#include "user.h"


#include "machine/cpu.h"

#include "vm/vm.h"

char	copyright[] =
"Copyright (c) 1982,1986,1989,1991 The Regents of the University of California.\nAll rights reserved.\n\n";

/*
 * Components of process 0;
 * never freed.
 */
struct	session session0;
struct	pgrp pgrp0;
struct	proc proc0;
struct	pcred cred0;
struct	filedesc0 filedesc0;
struct	plimit limit0;
struct	vmspace vmspace0;
struct	proc *curproc = &proc0;
struct	proc *initproc, *pageproc;

int	cmask = CMASK;
extern	struct user *proc0paddr;
extern	int (*mountroot)();

struct	vnode *rootvp, *swapdev_vp;
int	boothowto;
struct	timeval boottime;

/*
 * System startup; initialize the world, create process 0,
 * mount root filesystem, and fork to create init and pagedaemon.
 * Most of the hard work is done in the lower-level initialization
 * routines including startup(), which does memory initialization
 * and autoconfiguration.
 */
main()
{
	register int i;
	register struct proc *p;
	register struct filedesc0 *fdp;
	int s, rval[2];

	/*
	 * Initialize curproc before any possible traps/probes
	 * to simplify trap processing.
	 */
	p = &proc0;
	curproc = p;
	/*
	 * Attempt to find console and initialize
	 * in case of early panic or other messages.
	 */
	consinit();
	printf(copyright);

	vm_mem_init();
	kmeminit();
	cpu_startup();

	/*
	 * set up system process 0 (swapper)
	 */
	p = &proc0;
	curproc = p;

	allproc = p;
	p->p_prev = &allproc;
	p->p_pgrp = &pgrp0;
	pgrphash[0] = &pgrp0;
	pgrp0.pg_mem = p;
	pgrp0.pg_session = &session0;
	session0.s_count = 1;
	session0.s_leader = p;

	p->p_flag = SLOAD|SSYS;
	p->p_stat = SRUN;
	p->p_nice = NZERO;
	bcopy("swapper", p->p_comm, sizeof ("swapper"));

	/*
	 * Setup credentials
	 */
	cred0.p_refcnt = 1;
	p->p_cred = &cred0;
	p->p_ucred = crget();
	p->p_ucred->cr_ngroups = 1;	/* group 0 */

	/*
	 * Create the file descriptor table for process 0.
	 */
	fdp = &filedesc0;
	p->p_fd = &fdp->fd_fd;
	fdp->fd_fd.fd_refcnt = 1;
	fdp->fd_fd.fd_cmask = cmask;
	fdp->fd_fd.fd_ofiles = fdp->fd_dfiles;
	fdp->fd_fd.fd_ofileflags = fdp->fd_dfileflags;
	fdp->fd_fd.fd_nfiles = NDFILE;

	/*
	 * Set initial limits
	 */
	p->p_limit = &limit0;
	for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++)
		limit0.pl_rlimit[i].rlim_cur =
		    limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY;
	limit0.pl_rlimit[RLIMIT_OFILE].rlim_cur = NOFILE;
	limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC;
	limit0.p_refcnt = 1;

	/*
	 * Allocate a prototype map so we have something to fork
	 */
	p->p_vmspace = &vmspace0;
	vmspace0.vm_refcnt = 1;
	pmap_pinit(&vmspace0.vm_pmap);
	vm_map_init(&p->p_vmspace->vm_map, round_page(VM_MIN_ADDRESS),
	    trunc_page(VM_MAX_ADDRESS), TRUE);
	vmspace0.vm_map.pmap = &vmspace0.vm_pmap;
	p->p_addr = proc0paddr;				/* XXX */

	/*
	 * We continue to place resource usage info
	 * and signal actions in the user struct so they're pageable.
	 */
	p->p_stats = &p->p_addr->u_stats;
	p->p_sigacts = &p->p_addr->u_sigacts;

	rqinit();

	/*
	 * configure virtual memory system,
	 * set vm rlimits
	 */
	vm_init_limits(p);

	/*
	 * Initialize the file systems.
	 *
	 * Get vnodes for swapdev and rootdev.
	 */
	vfsinit();
	if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp))
		panic("can't setup bdevvp's");

	startrtclock();
#if defined(vax)
#include "kg.h"
#if NKG > 0
	startkgclock();
#endif
#endif

	/*
	 * Initialize tables, protocols, and set up well-known inodes.
	 */
	mbinit();
	cinit();
#ifdef SYSVSHM
	shminit();
#endif
#include "sl.h"
#if NSL > 0
	slattach();			/* XXX */
#endif
#include "loop.h"
#if NLOOP > 0
	loattach();			/* XXX */
#endif
	/*
	 * Block reception of incoming packets
	 * until protocols have been initialized.
	 */
	s = splimp();
	ifinit();
	domaininit();
	splx(s);

#ifdef GPROF
	kmstartup();
#endif

	/* kick off timeout driven events by calling first time */
	roundrobin();
	schedcpu();
	enablertclock();		/* enable realtime clock interrupts */

	/*
	 * Set up the root file system and vnode.
	 */
	if ((*mountroot)())
		panic("cannot mount root");
	/*
	 * Get vnode for '/'.
	 * Setup rootdir and fdp->fd_fd.fd_cdir to point to it.
	 */
	if (VFS_ROOT(rootfs, &rootdir))
		panic("cannot find root vnode");
	fdp->fd_fd.fd_cdir = rootdir;
	VREF(fdp->fd_fd.fd_cdir);
	VOP_UNLOCK(rootdir);
	fdp->fd_fd.fd_rdir = NULL;
	swapinit();

	/*
	 * Now can look at time, having had a chance
	 * to verify the time from the file system.
	 */
	mono_time = boottime = p->p_stats->p_start = time;

	/*
	 * make init process
	 */
	siginit(p);
	if (fork(p, NULL, rval))
		panic("fork init");
	if (rval[1]) {
		extern int icode[];		/* user init code */
		extern int szicode;		/* size of icode */
		static char initflags[] = "-sf";
		vm_offset_t addr;
		char *ip;

		/*
		 * Now in process 1.  Set init flags into icode, get a minimal
		 * address space, copy out "icode", and return to it to do an
		 * exec of init.
		 */
		ip = initflags + 1;
		if (boothowto&RB_SINGLE)
			*ip++ = 's';
#ifdef notyet
		if (boothowto&RB_FASTBOOT)
			*ip++ = 'f';
#endif
		if (ip == initflags + 1)
			*ip++ = '-';
		*ip++ = '\0';

		addr = VM_MIN_ADDRESS;
		initproc = p = curproc;
		if (vm_allocate(&p->p_vmspace->vm_map, &addr,
		    round_page(szicode + sizeof(initflags)), FALSE) != 0 ||
		    addr != VM_MIN_ADDRESS)
			panic("init: couldn't allocate at zero");

		/* need just enough stack to exec from */
		addr = trunc_page(USRSTACK - PAGE_SIZE);
		if (vm_allocate(&p->p_vmspace->vm_map, &addr,
		    PAGE_SIZE, FALSE) != KERN_SUCCESS)
			panic("vm_allocate init stack");
		p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
		(void)copyout((caddr_t)icode, (caddr_t)VM_MIN_ADDRESS,
		    (u_int)szicode);
		(void)copyout(initflags, (caddr_t)(VM_MIN_ADDRESS + szicode),
		    sizeof(initflags));
		return;			/* returns to icode */
	}

	/*
	 * Start up pageout daemon (process 2).
	 */
	if (fork(p, NULL, rval))
		panic("fork pager");
	if (rval[1]) {
		/*
		 * Now in process 2.
		 */
		p = curproc;
		pageproc = p;
		p->p_flag |= SLOAD|SSYS;		/* XXX */
		bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon"));
		vm_pageout();
		/*NOTREACHED*/
	}

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