usr/src/sys/kern/init_main.c

/*	init_main.c	4.38	82/09/12	*/

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/dir.h"
#include "../h/user.h"
#include "../h/kernel.h"
#include "../h/fs.h"
#include "../h/mount.h"
#include "../h/map.h"
#include "../h/proc.h"
#include "../h/inode.h"
#include "../h/seg.h"
#include "../h/conf.h"
#include "../h/buf.h"
#include "../h/mtpr.h"
#include "../h/pte.h"
#include "../h/vm.h"
#include "../h/cmap.h"
#include "../h/text.h"
#include "../h/clist.h"
#ifdef INET
#include "../h/protosw.h"
#endif
#include "../h/quota.h"

/*
 * Initialization code.
 * Called from cold start routine as
 * soon as a stack and segmentation
 * have been established.
 * Functions:
 *	clear and free user core
 *	turn on clock
 *	hand craft 0th process
 *	call all initialization routines
 *	fork - process 0 to schedule
 *	     - process 2 to page out
 *	     - process 1 execute bootstrap
 *
 * loop at loc 13 (0xd) in user mode -- /etc/init
 *	cannot be executed.
 */
main(firstaddr)
{
	register int i;
	register struct proc *p;
	struct fs *fs;

	rqinit();
#include "loop.h"
	startup(firstaddr);

	/*
	 * set up system process 0 (swapper)
	 */
	p = &proc[0];
	p->p_p0br = (struct pte *)mfpr(P0BR);
	p->p_szpt = 1;
	p->p_addr = uaddr(p);
	p->p_stat = SRUN;
	p->p_flag |= SLOAD|SSYS;
	p->p_nice = NZERO;
	setredzone(p->p_addr, (caddr_t)&u);
	u.u_procp = p;
	u.u_cmask = CMASK;
	for (i = 1; i < NGROUPS; i++)
		u.u_groups[i] = -1;
	for (i = 0; i < sizeof(u.u_rlimit)/sizeof(u.u_rlimit[0]); i++)
		u.u_rlimit[i].rlim_cur = u.u_rlimit[i].rlim_max =
		    RLIM_INFINITY;
	u.u_rlimit[RLIMIT_STACK].rlim_cur = 512*1024;
	u.u_rlimit[RLIMIT_STACK].rlim_max = ctob(MAXDSIZ);
	u.u_rlimit[RLIMIT_DATA].rlim_max =
	    u.u_rlimit[RLIMIT_DATA].rlim_cur = ctob(MAXDSIZ);
	p->p_maxrss = RLIM_INFINITY/NBPG;
#ifdef QUOTA
	qtinit();
	p->p_quota = u.u_quota = getquota(0, 0, Q_NDQ);
#endif
	clockstart();

	/*
	 * Initialize tables, protocols, and set up well-known inodes.
	 */
	mbinit();
	cinit();			/* needed by dmc-11 driver */
#ifdef INET
#if NLOOP > 0
	loattach();			/* XXX */
#endif
	ifinit();
	pfinit();			/* must follow interfaces */
#endif
	ihinit();
	bhinit();
	binit();
	bswinit();
#ifdef GPROF
	kmstartup();
#endif

	fs = mountfs(rootdev, 0, (struct inode *)0);
	if (fs == 0)
		panic("iinit");
	bcopy("/", fs->fs_fsmnt, 2);

/* initialize wall clock */
	clockinit(fs->fs_time);
	boottime = time;

/* kick off timeout driven events by calling first time */
	roundrobin();
	schedcpu();
	schedpaging();

/* set up the root file system */
	rootdir = iget(rootdev, fs, (ino_t)ROOTINO);
	iunlock(rootdir);
	u.u_cdir = iget(rootdev, fs, (ino_t)ROOTINO);
	iunlock(u.u_cdir);
	u.u_rdir = NULL;

	u.u_dmap = zdmap;
	u.u_smap = zdmap;

	/*
	 * Set the scan rate and other parameters of the paging subsystem.
	 */
	setupclock();

	/*
	 * make page-out daemon (process 2)
	 * the daemon has ctopt(nswbuf*CLSIZE*KLMAX) pages of page
	 * table so that it can map dirty pages into
	 * its address space during asychronous pushes.
	 */
	mpid = 1;
	proc[0].p_szpt = clrnd(ctopt(nswbuf*CLSIZE*KLMAX + UPAGES));
	proc[1].p_stat = SZOMB;		/* force it to be in proc slot 2 */
	if (newproc(0)) {
		proc[2].p_flag |= SLOAD|SSYS;
		proc[2].p_dsize = u.u_dsize = nswbuf*CLSIZE*KLMAX;
		pageout();
	}

	/*
	 * make init process and
	 * enter scheduling loop
	 */

	mpid = 0;
	proc[1].p_stat = 0;
	proc[0].p_szpt = CLSIZE;
	if (newproc(0)) {
		expand(clrnd((int)btoc(szicode)), P0BR);
		(void) swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap);
		(void) copyout((caddr_t)icode, (caddr_t)0, (unsigned)szicode);
		/*
		 * Return goes to loc. 0 of user init
		 * code just copied out.
		 */
		return;
	}
#ifdef MUSH
	/*
	 * start MUSH daemon
	 *			pid == 3
	 */
	if (newproc(0)) {
		expand(clrnd((int)btoc(szmcode)), P0BR);
		(void) swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap);
		(void) copyout((caddr_t)mcode, (caddr_t)0, (unsigned)szmcode);
		/*
		 * Return goes to loc. 0 of user mush
		 * code just copied out.
		 */
		return;
	}
#endif
	proc[0].p_szpt = 1;
	sched();
}

/*
 * Initialize hash links for buffers.
 */
bhinit()
{
	register int i;
	register struct bufhd *bp;

	for (bp = bufhash, i = 0; i < BUFHSZ; i++, bp++)
		bp->b_forw = bp->b_back = (struct buf *)bp;
}

/*
 * Initialize the buffer I/O system by freeing
 * all buffers and setting all device buffer lists to empty.
 */
binit()
{
	register struct buf *bp;
	register struct buf *dp;
	register int i;
	struct bdevsw *bdp;
	struct swdevt *swp;

	for (dp = bfreelist; dp < &bfreelist[BQUEUES]; dp++) {
		dp->b_forw = dp->b_back = dp->av_forw = dp->av_back = dp;
		dp->b_flags = B_HEAD;
	}
	dp--;				/* dp = &bfreelist[BQUEUES-1]; */
	for (i = 0; i < nbuf; i++) {
		bp = &buf[i];
		bp->b_dev = NODEV;
		bp->b_un.b_addr = buffers + i * MAXBSIZE;
		bp->b_bcount = MAXBSIZE;
		bp->b_back = dp;
		bp->b_forw = dp->b_forw;
		dp->b_forw->b_back = bp;
		dp->b_forw = bp;
		bp->b_flags = B_BUSY|B_INVAL;
		brelse(bp);
	}
	for (bdp = bdevsw; bdp->d_open; bdp++)
		nblkdev++;
	/*
	 * Count swap devices, and adjust total swap space available.
	 * Some of this space will not be available until a vswapon()
	 * system is issued, usually when the system goes multi-user.
	 */
	nswdev = 0;
	for (swp = swdevt; swp->sw_dev; swp++)
		nswdev++;
	if (nswdev == 0)
		panic("binit");
	if (nswdev > 1)
		nswap = (nswap/DMMAX)*DMMAX;
	nswap *= nswdev;
	maxpgio *= nswdev;
	swfree(0);
}

/*
 * Initialize linked list of free swap
 * headers. These do not actually point
 * to buffers, but rather to pages that
 * are being swapped in and out.
 */
bswinit()
{
	register int i;
	register struct buf *sp = swbuf;

	bswlist.av_forw = sp;
	for (i=0; i<nswbuf-1; i++, sp++)
		sp->av_forw = sp+1;
	sp->av_forw = NULL;
}

/*
 * Initialize clist by freeing all character blocks, then count
 * number of character devices. (Once-only routine)
 */
cinit()
{
	register int ccp;
	register struct cblock *cp;
	register struct cdevsw *cdp;

	ccp = (int)cfree;
	ccp = (ccp+CROUND) & ~CROUND;
	for(cp=(struct cblock *)ccp; cp < &cfree[nclist-1]; cp++) {
		cp->c_next = cfreelist;
		cfreelist = cp;
		cfreecount += CBSIZE;
	}
	ccp = 0;
	for(cdp = cdevsw; cdp->d_open; cdp++)
		ccp++;
	nchrdev = ccp;
}
Commit	Line	Data
	1	/* init_main.c 4.38 82/09/12 */
	2
	3	#include "../h/param.h"
	4	#include "../h/systm.h"
	5	#include "../h/dir.h"
	6	#include "../h/user.h"
	7	#include "../h/kernel.h"
	8	#include "../h/fs.h"
	9	#include "../h/mount.h"
	10	#include "../h/map.h"
	11	#include "../h/proc.h"
	12	#include "../h/inode.h"
	13	#include "../h/seg.h"
	14	#include "../h/conf.h"
	15	#include "../h/buf.h"
	16	#include "../h/mtpr.h"
	17	#include "../h/pte.h"
	18	#include "../h/vm.h"
	19	#include "../h/cmap.h"
	20	#include "../h/text.h"
	21	#include "../h/clist.h"
	22	#ifdef INET
	23	#include "../h/protosw.h"
	24	#endif
	25	#include "../h/quota.h"
	26
	27	/*
	28	* Initialization code.
	29	* Called from cold start routine as
	30	* soon as a stack and segmentation
	31	* have been established.
	32	* Functions:
	33	* clear and free user core
	34	* turn on clock
	35	* hand craft 0th process
	36	* call all initialization routines
	37	* fork - process 0 to schedule
	38	* - process 2 to page out
	39	* - process 1 execute bootstrap
	40	*
	41	* loop at loc 13 (0xd) in user mode -- /etc/init
	42	* cannot be executed.
	43	*/
	44	main(firstaddr)
	45	{
	46	register int i;
	47	register struct proc *p;
	48	struct fs *fs;
	49
	50	rqinit();
	51	#include "loop.h"
	52	startup(firstaddr);
	53
	54	/*
	55	* set up system process 0 (swapper)
	56	*/
	57	p = &proc[0];
	58	p->p_p0br = (struct pte *)mfpr(P0BR);
	59	p->p_szpt = 1;
	60	p->p_addr = uaddr(p);
	61	p->p_stat = SRUN;
	62	p->p_flag \|= SLOAD\|SSYS;
	63	p->p_nice = NZERO;
	64	setredzone(p->p_addr, (caddr_t)&u);
	65	u.u_procp = p;
	66	u.u_cmask = CMASK;
	67	for (i = 1; i < NGROUPS; i++)
	68	u.u_groups[i] = -1;
	69	for (i = 0; i < sizeof(u.u_rlimit)/sizeof(u.u_rlimit[0]); i++)
	70	u.u_rlimit[i].rlim_cur = u.u_rlimit[i].rlim_max =
	71	RLIM_INFINITY;
	72	u.u_rlimit[RLIMIT_STACK].rlim_cur = 512*1024;
	73	u.u_rlimit[RLIMIT_STACK].rlim_max = ctob(MAXDSIZ);
	74	u.u_rlimit[RLIMIT_DATA].rlim_max =
	75	u.u_rlimit[RLIMIT_DATA].rlim_cur = ctob(MAXDSIZ);
	76	p->p_maxrss = RLIM_INFINITY/NBPG;
	77	#ifdef QUOTA
	78	qtinit();
	79	p->p_quota = u.u_quota = getquota(0, 0, Q_NDQ);
	80	#endif
	81	clockstart();
	82
	83	/*
	84	* Initialize tables, protocols, and set up well-known inodes.
	85	*/
	86	mbinit();
	87	cinit(); /* needed by dmc-11 driver */
	88	#ifdef INET
	89	#if NLOOP > 0
	90	loattach(); /* XXX */
	91	#endif
	92	ifinit();
	93	pfinit(); /* must follow interfaces */
	94	#endif
	95	ihinit();
	96	bhinit();
	97	binit();
	98	bswinit();
	99	#ifdef GPROF
	100	kmstartup();
	101	#endif
	102
	103	fs = mountfs(rootdev, 0, (struct inode *)0);
	104	if (fs == 0)
	105	panic("iinit");
	106	bcopy("/", fs->fs_fsmnt, 2);
	107
	108	/* initialize wall clock */
	109	clockinit(fs->fs_time);
	110	boottime = time;
	111
	112	/* kick off timeout driven events by calling first time */
	113	roundrobin();
	114	schedcpu();
	115	schedpaging();
	116
	117	/* set up the root file system */
	118	rootdir = iget(rootdev, fs, (ino_t)ROOTINO);
	119	iunlock(rootdir);
	120	u.u_cdir = iget(rootdev, fs, (ino_t)ROOTINO);
	121	iunlock(u.u_cdir);
	122	u.u_rdir = NULL;
	123
	124	u.u_dmap = zdmap;
	125	u.u_smap = zdmap;
	126
	127	/*
	128	* Set the scan rate and other parameters of the paging subsystem.
	129	*/
	130	setupclock();
	131
	132	/*
	133	* make page-out daemon (process 2)
	134	* the daemon has ctopt(nswbufCLSIZEKLMAX) pages of page
	135	* table so that it can map dirty pages into
	136	* its address space during asychronous pushes.
	137	*/
	138	mpid = 1;
	139	proc[0].p_szpt = clrnd(ctopt(nswbufCLSIZEKLMAX + UPAGES));
	140	proc[1].p_stat = SZOMB; /* force it to be in proc slot 2 */
	141	if (newproc(0)) {
	142	proc[2].p_flag \|= SLOAD\|SSYS;
	143	proc[2].p_dsize = u.u_dsize = nswbufCLSIZEKLMAX;
	144	pageout();
	145	}
	146
	147	/*
	148	* make init process and
	149	* enter scheduling loop
	150	*/
	151
	152	mpid = 0;
	153	proc[1].p_stat = 0;
	154	proc[0].p_szpt = CLSIZE;
	155	if (newproc(0)) {
	156	expand(clrnd((int)btoc(szicode)), P0BR);
	157	(void) swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap);
	158	(void) copyout((caddr_t)icode, (caddr_t)0, (unsigned)szicode);
	159	/*
	160	* Return goes to loc. 0 of user init
	161	* code just copied out.
	162	*/
	163	return;
	164	}
	165	#ifdef MUSH
	166	/*
	167	* start MUSH daemon
	168	* pid == 3
	169	*/
	170	if (newproc(0)) {
	171	expand(clrnd((int)btoc(szmcode)), P0BR);
	172	(void) swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap);
	173	(void) copyout((caddr_t)mcode, (caddr_t)0, (unsigned)szmcode);
	174	/*
	175	* Return goes to loc. 0 of user mush
	176	* code just copied out.
	177	*/
	178	return;
	179	}
	180	#endif
	181	proc[0].p_szpt = 1;
	182	sched();
	183	}
	184
	185	/*
	186	* Initialize hash links for buffers.
	187	*/
	188	bhinit()
	189	{
	190	register int i;
	191	register struct bufhd *bp;
	192
	193	for (bp = bufhash, i = 0; i < BUFHSZ; i++, bp++)
	194	bp->b_forw = bp->b_back = (struct buf *)bp;
	195	}
	196
	197	/*
	198	* Initialize the buffer I/O system by freeing
	199	* all buffers and setting all device buffer lists to empty.
	200	*/
	201	binit()
	202	{
	203	register struct buf *bp;
	204	register struct buf *dp;
	205	register int i;
	206	struct bdevsw *bdp;
	207	struct swdevt *swp;
	208
	209	for (dp = bfreelist; dp < &bfreelist[BQUEUES]; dp++) {
	210	dp->b_forw = dp->b_back = dp->av_forw = dp->av_back = dp;
	211	dp->b_flags = B_HEAD;
	212	}
	213	dp--; /* dp = &bfreelist[BQUEUES-1]; */
	214	for (i = 0; i < nbuf; i++) {
	215	bp = &buf[i];
	216	bp->b_dev = NODEV;
	217	bp->b_un.b_addr = buffers + i * MAXBSIZE;
	218	bp->b_bcount = MAXBSIZE;
	219	bp->b_back = dp;
	220	bp->b_forw = dp->b_forw;
	221	dp->b_forw->b_back = bp;
	222	dp->b_forw = bp;
	223	bp->b_flags = B_BUSY\|B_INVAL;
	224	brelse(bp);
	225	}
	226	for (bdp = bdevsw; bdp->d_open; bdp++)
	227	nblkdev++;
	228	/*
	229	* Count swap devices, and adjust total swap space available.
	230	* Some of this space will not be available until a vswapon()
	231	* system is issued, usually when the system goes multi-user.
	232	*/
	233	nswdev = 0;
	234	for (swp = swdevt; swp->sw_dev; swp++)
	235	nswdev++;
	236	if (nswdev == 0)
	237	panic("binit");
	238	if (nswdev > 1)
	239	nswap = (nswap/DMMAX)*DMMAX;
	240	nswap *= nswdev;
	241	maxpgio *= nswdev;
	242	swfree(0);
	243	}
	244
	245	/*
	246	* Initialize linked list of free swap
	247	* headers. These do not actually point
	248	* to buffers, but rather to pages that
	249	* are being swapped in and out.
	250	*/
	251	bswinit()
	252	{
	253	register int i;
	254	register struct buf *sp = swbuf;
	255
	256	bswlist.av_forw = sp;
	257	for (i=0; i<nswbuf-1; i++, sp++)
	258	sp->av_forw = sp+1;
	259	sp->av_forw = NULL;
	260	}
	261
	262	/*
	263	* Initialize clist by freeing all character blocks, then count
	264	* number of character devices. (Once-only routine)
	265	*/
	266	cinit()
	267	{
	268	register int ccp;
	269	register struct cblock *cp;
	270	register struct cdevsw *cdp;
	271
	272	ccp = (int)cfree;
	273	ccp = (ccp+CROUND) & ~CROUND;
	274	for(cp=(struct cblock *)ccp; cp < &cfree[nclist-1]; cp++) {
	275	cp->c_next = cfreelist;
	276	cfreelist = cp;
	277	cfreecount += CBSIZE;
	278	}
	279	ccp = 0;
	280	for(cdp = cdevsw; cdp->d_open; cdp++)
	281	ccp++;
	282	nchrdev = ccp;
	283	}