[unix-history] / usr / src / sys / vax / mba / mba.c

/*	mba.c	4.17	81/03/08	*/

#include "mba.h"
#if NMBA > 0
/*
 * Massbus driver, arbitrates a massbus among attached devices.
 */
#include "../h/param.h"
#include "../h/systm.h"
#include "../h/dk.h"
#include "../h/buf.h"
#include "../h/conf.h"
#include "../h/dir.h"
#include "../h/user.h"
#include "../h/proc.h"
#include "../h/map.h"
#include "../h/pte.h"
#include "../h/mbareg.h"
#include "../h/mbavar.h"
#include "../h/mtpr.h"
#include "../h/vm.h"

char	mbsr_bits[] = MBSR_BITS;
/*
 * Start activity on a massbus device.
 * We are given the device's mba_device structure and activate
 * the device via the unit start routine.  The unit start
 * routine may indicate that it is finished (e.g. if the operation
 * was a ``sense'' on a tape drive), that the (multi-ported) unit
 * is busy (we will get an interrupt later), that it started the
 * unit (e.g. for a non-data transfer operation), or that it has
 * set up a data transfer operation and we should start the massbus adaptor.
 */
mbustart(mi)
	register struct mba_device *mi;
{
	register struct buf *bp;	/* i/o operation at head of queue */
	register struct mba_hd *mhp;	/* header for mba device is on */

loop:
	/*
	 * Get the first thing to do off device queue.
	 */
	bp = mi->mi_tab.b_actf;
	if (bp == NULL)
		return;
	/*
	 * Let the drivers unit start routine have at it
	 * and then process the request further, per its instructions.
	 */
	switch ((*mi->mi_driver->md_ustart)(mi)) {

	case MBU_NEXT:		/* request is complete (e.g. ``sense'') */
		mi->mi_tab.b_active = 0;
		mi->mi_tab.b_errcnt = 0;
		mi->mi_tab.b_actf = bp->av_forw;
		iodone(bp);
		goto loop;

	case MBU_DODATA:	/* all ready to do data transfer */
		/*
		 * Queue the device mba_device structure on the massbus
		 * mba_hd structure for processing as soon as the
		 * data path is available.
		 */
		mhp = mi->mi_hd;
		mi->mi_forw = NULL;
		if (mhp->mh_actf == NULL)
			mhp->mh_actf = mi;
		else
			mhp->mh_actl->mi_forw = mi;
		mhp->mh_actl = mi;
		/*
		 * If data path is idle, start transfer now.
		 * In any case the device is ``active'' waiting for the
		 * data to transfer.
		 */
		mi->mi_tab.b_active = 1;
		if (mhp->mh_active == 0)
			mbstart(mhp);
		return;

	case MBU_STARTED:	/* driver started a non-data transfer */
		/*
		 * Mark device busy during non-data transfer
		 * and count this as a ``seek'' on the device.
		 */
		if (mi->mi_dk >= 0)
			dk_seek[mi->mi_dk]++;
		mi->mi_tab.b_active = 1;
		return;

	case MBU_BUSY:		/* dual port drive busy */
		/*
		 * We mark the device structure so that when an
		 * interrupt occurs we will know to restart the unit.
		 */
		mi->mi_tab.b_flags |= B_BUSY;
		return;

	default:
		panic("mbustart");
	}
}

/*
 * Start an i/o operation on the massbus specified by the argument.
 * We peel the first operation off its queue and insure that the drive
 * is present and on-line.  We then use the drivers start routine
 * (if any) to prepare the drive, setup the massbus map for the transfer
 * and start the transfer.
 */
mbstart(mhp)
	register struct mba_hd *mhp;
{
	register struct mba_device *mi;
	struct buf *bp;
	register struct mba_regs *mbp;

loop:
	/*
	 * Look for an operation at the front of the queue.
	 */
	if ((mi = mhp->mh_actf) == NULL) {
		return;
	}
	if ((bp = mi->mi_tab.b_actf) == NULL) {
		mhp->mh_actf = mi->mi_forw;
		goto loop;
	}
	/*
	 * If this device isn't present and on-line, then
	 * we screwed up, and can't really do the operation.
	 */
	if ((mi->mi_drv->mbd_ds & MBDS_DREADY) != MBDS_DREADY) {
		printf("%s%d: not ready\n", mi->mi_driver->md_dname,
		    dkunit(bp));
		mi->mi_tab.b_actf = bp->av_forw;
		mi->mi_tab.b_errcnt = 0;
		mi->mi_tab.b_active = 0;
		bp->b_flags |= B_ERROR;
		iodone(bp);
		goto loop;
	}
	/*
	 * We can do the operation; mark the massbus active
	 * and let the device start routine setup any necessary
	 * device state for the transfer (e.g. desired cylinder, etc
	 * on disks).
	 */
	mhp->mh_active = 1;
	if (mi->mi_driver->md_start)
		(*mi->mi_driver->md_start)(mi);

	/*
	 * Setup the massbus control and map registers and start
	 * the transfer.
	 */
	mbp = mi->mi_mba;
	mbp->mba_sr = -1;	/* conservative */
	mbp->mba_var = mbasetup(mi);
	mbp->mba_bcr = -bp->b_bcount;
	mi->mi_drv->mbd_cs1 =
	    (bp->b_flags & B_READ) ? MB_RCOM|MB_GO : MB_WCOM|MB_GO;
	if (mi->mi_dk >= 0) {
		dk_busy |= 1 << mi->mi_dk;
		dk_xfer[mi->mi_dk]++;
		dk_wds[mi->mi_dk] += bp->b_bcount >> 6;
	}
}

/*
 * Take an interrupt off of massbus mbanum,
 * and dispatch to drivers as appropriate.
 */
mbintr(mbanum)
	int mbanum;
{
	register struct mba_hd *mhp = &mba_hd[mbanum];
	register struct mba_regs *mbp = mhp->mh_mba;
	register struct mba_device *mi;
	register struct buf *bp;
	register int drive;
	int mbasr, as;
	
	/*
	 * Read out the massbus status register
	 * and attention status register and clear
	 * the bits in same by writing them back.
	 */
	mbasr = mbp->mba_sr;
	mbp->mba_sr = mbasr;
#if VAX750
	if (mbasr&MBSR_CBHUNG) {
		printf("mba%d: control bus hung\n", mbanum);
		panic("cbhung");
	}
#endif
	/* note: the mbd_as register is shared between drives */
	as = mbp->mba_drv[0].mbd_as & 0xff;
	mbp->mba_drv[0].mbd_as = as;

	/*
	 * If the mba was active, process the data transfer
	 * complete interrupt; otherwise just process units which
	 * are now finished.
	 */
	if (mhp->mh_active) {
		/*
		 * Clear attention status for drive whose data
		 * transfer related operation completed,
		 * and give the dtint driver
		 * routine a chance to say what is next.
		 */
		mi = mhp->mh_actf;
		as &= ~(1 << mi->mi_drive);
		dk_busy &= ~(1 << mi->mi_dk);
		bp = mi->mi_tab.b_actf;
		switch ((*mi->mi_driver->md_dtint)(mi, mbasr)) {

		case MBD_DONE:		/* all done, for better or worse */
			/*
			 * Flush request from drive queue.
			 */
			mi->mi_tab.b_errcnt = 0;
			mi->mi_tab.b_actf = bp->av_forw;
			iodone(bp);
			/* fall into... */
		case MBD_RETRY:		/* attempt the operation again */
			/*
			 * Dequeue data transfer from massbus queue;
			 * if there is still a i/o request on the device
			 * queue then start the next operation on the device.
			 * (Common code for DONE and RETRY).
			 */
			mhp->mh_active = 0;
			mi->mi_tab.b_active = 0;
			mhp->mh_actf = mi->mi_forw;
			if (mi->mi_tab.b_actf)
				mbustart(mi);
			break;

		case MBD_RESTARTED:	/* driver restarted op (ecc, e.g.)
			/*
			 * Note that mhp->mh_active is still on.
			 */
			break;

		default:
			panic("mbintr");
		}
	}
	/*
	 * Service drives which require attention
	 * after non-data-transfer operations.
	 */
	while (drive = ffs(as)) {
		drive--;		/* was 1 origin */
		as &= ~(1 << drive);
		mi = mhp->mh_mbip[drive];
		if (mi == NULL)
			continue;
		/*
		 * If driver has a handler for non-data transfer
		 * interrupts, give it a chance to tell us what to do.
		 */
		if (mi->mi_driver->md_ndint) {
			mi->mi_tab.b_active = 0;
			switch ((*mi->mi_driver->md_ndint)(mi)) {

			case MBN_DONE:		/* operation completed */
				mi->mi_tab.b_errcnt = 0;
				bp = mi->mi_tab.b_actf;
				mi->mi_tab.b_actf = bp->av_forw;
				iodone(bp);
				/* fall into common code */
			case MBN_RETRY:		/* operation continues */
				if (mi->mi_tab.b_actf)
					mbustart(mi);
				break;
			case MBN_SKIP:		/* ignore unsol. interrupt */
				break;
			default:
				panic("mbintr");
			}
		} else
			/*
			 * If there is no non-data transfer interrupt
			 * routine, then we should just
			 * restart the unit, leading to a mbstart() soon.
			 */
			mbustart(mi);
	}
	/*
	 * If there is an operation available and
	 * the massbus isn't active, get it going.
	 */
	if (mhp->mh_actf && !mhp->mh_active)
		mbstart(mhp);
	/* THHHHATS all folks... */
}

/*
 * Setup the mapping registers for a transfer.
 */
mbasetup(mi)
	register struct mba_device *mi;
{
	register struct mba_regs *mbap = mi->mi_mba;
	struct buf *bp = mi->mi_tab.b_actf;
	register int i;
	int npf;
	unsigned v;
	register struct pte *pte, *io;
	int o;
	int vaddr;
	struct proc *rp;

	io = mbap->mba_map;
	v = btop(bp->b_un.b_addr);
	o = (int)bp->b_un.b_addr & PGOFSET;
	npf = btoc(bp->b_bcount + o);
	rp = bp->b_flags&B_DIRTY ? &proc[2] : bp->b_proc;
	vaddr = o;
	if (bp->b_flags & B_UAREA) {
		for (i = 0; i < UPAGES; i++) {
			if (rp->p_addr[i].pg_pfnum == 0)
				panic("mba: zero upage");
			*(int *)io++ = rp->p_addr[i].pg_pfnum | PG_V;
		}
	} else if ((bp->b_flags & B_PHYS) == 0) {
		pte = &Sysmap[btop(((int)bp->b_un.b_addr)&0x7fffffff)];
		while (--npf >= 0)
			*(int *)io++ = pte++->pg_pfnum | PG_V;
	} else {
		if (bp->b_flags & B_PAGET)
			pte = &Usrptmap[btokmx((struct pte *)bp->b_un.b_addr)];
		else
			pte = vtopte(rp, v);
		while (--npf >= 0) {
			if (pte->pg_pfnum == 0)
				panic("mba, zero entry");
			*(int *)io++ = pte++->pg_pfnum | PG_V;
		}
	}
	*(int *)io++ = 0;
	return (vaddr);
}

/*
 * Init and interrupt enable a massbus adapter.
 */
mbainit(mp)
	struct mba_regs *mp;
{

	mp->mba_cr = MBCR_INIT;
	mp->mba_cr = MBCR_IE;
}
#endif
Commit	Line	Data
d565635a	1	/* mba.c 4.17 81/03/08 */
b81fd3e8	2
443c8066 BJ	3	#include "mba.h"
443c8066 BJ	4	#if NMBA > 0
b81fd3e8	5	/*
d565635a	6	* Massbus driver, arbitrates a massbus among attached devices.
b81fd3e8	7	*/
b5ad10c3	8	#include "../h/param.h"
b81fd3e8 BJ	9	#include "../h/systm.h"
b81fd3e8 BJ	10	#include "../h/dk.h"
b5ad10c3 BJ	11	#include "../h/buf.h"
b5ad10c3 BJ	12	#include "../h/conf.h"
b5ad10c3 BJ	13	#include "../h/dir.h"
	14	#include "../h/user.h"
	15	#include "../h/proc.h"
b5ad10c3	16	#include "../h/map.h"
b81fd3e8	17	#include "../h/pte.h"
89bd2f01 BJ	18	#include "../h/mbareg.h"
89bd2f01 BJ	19	#include "../h/mbavar.h"
b5ad10c3 BJ	20	#include "../h/mtpr.h"
	21	#include "../h/vm.h"
	22
d565635a	23	char mbsr_bits[] = MBSR_BITS;
b5ad10c3	24	/*
b81fd3e8	25	* Start activity on a massbus device.
89bd2f01	26	* We are given the device's mba_device structure and activate
b81fd3e8 BJ	27	* the device via the unit start routine. The unit start
	28	* routine may indicate that it is finished (e.g. if the operation
	29	* was a ``sense'' on a tape drive), that the (multi-ported) unit
	30	* is busy (we will get an interrupt later), that it started the
	31	* unit (e.g. for a non-data transfer operation), or that it has
	32	* set up a data transfer operation and we should start the massbus adaptor.
b5ad10c3	33	*/
b81fd3e8	34	mbustart(mi)
89bd2f01	35	register struct mba_device *mi;
b81fd3e8	36	{
b81fd3e8 BJ	37	register struct buf bp; / i/o operation at head of queue */
	38	register struct mba_hd mhp; / header for mba device is on */
	39
b81fd3e8 BJ	40	loop:
	41	/*
	42	* Get the first thing to do off device queue.
	43	*/
	44	bp = mi->mi_tab.b_actf;
	45	if (bp == NULL)
	46	return;
b81fd3e8 BJ	47	/*
	48	* Let the drivers unit start routine have at it
	49	* and then process the request further, per its instructions.
	50	*/
	51	switch ((*mi->mi_driver->md_ustart)(mi)) {
	52
	53	case MBU_NEXT: /* request is complete (e.g. ``sense'') */
b81fd3e8	54	mi->mi_tab.b_active = 0;
cda4cdd4	55	mi->mi_tab.b_errcnt = 0;
b81fd3e8 BJ	56	mi->mi_tab.b_actf = bp->av_forw;
	57	iodone(bp);
	58	goto loop;
	59
	60	case MBU_DODATA: /* all ready to do data transfer */
b81fd3e8	61	/*
89bd2f01	62	* Queue the device mba_device structure on the massbus
b81fd3e8 BJ	63	* mba_hd structure for processing as soon as the
	64	* data path is available.
	65	*/
	66	mhp = mi->mi_hd;
	67	mi->mi_forw = NULL;
	68	if (mhp->mh_actf == NULL)
	69	mhp->mh_actf = mi;
	70	else
	71	mhp->mh_actl->mi_forw = mi;
	72	mhp->mh_actl = mi;
	73	/*
	74	* If data path is idle, start transfer now.
	75	* In any case the device is ``active'' waiting for the
	76	* data to transfer.
	77	*/
3dbaa9da	78	mi->mi_tab.b_active = 1;
b81fd3e8 BJ	79	if (mhp->mh_active == 0)
b81fd3e8 BJ	80	mbstart(mhp);
b81fd3e8 BJ	81	return;
	82
	83	case MBU_STARTED: /* driver started a non-data transfer */
b81fd3e8 BJ	84	/*
	85	* Mark device busy during non-data transfer
	86	* and count this as a ``seek'' on the device.
	87	*/
	88	if (mi->mi_dk >= 0)
	89	dk_seek[mi->mi_dk]++;
	90	mi->mi_tab.b_active = 1;
	91	return;
	92
	93	case MBU_BUSY: /* dual port drive busy */
b81fd3e8 BJ	94	/*
	95	* We mark the device structure so that when an
	96	* interrupt occurs we will know to restart the unit.
	97	*/
	98	mi->mi_tab.b_flags \|= B_BUSY;
	99	return;
	100
	101	default:
	102	panic("mbustart");
	103	}
e1e57888	104	}
b81fd3e8 BJ	105
	106	/*
	107	* Start an i/o operation on the massbus specified by the argument.
	108	* We peel the first operation off its queue and insure that the drive
	109	* is present and on-line. We then use the drivers start routine
	110	* (if any) to prepare the drive, setup the massbus map for the transfer
	111	* and start the transfer.
	112	*/
	113	mbstart(mhp)
	114	register struct mba_hd *mhp;
	115	{
89bd2f01	116	register struct mba_device *mi;
b81fd3e8	117	struct buf *bp;
b81fd3e8 BJ	118	register struct mba_regs *mbp;
b81fd3e8 BJ	119
b81fd3e8 BJ	120	loop:
	121	/*
	122	* Look for an operation at the front of the queue.
	123	*/
cda4cdd4	124	if ((mi = mhp->mh_actf) == NULL) {
b81fd3e8	125	return;
cda4cdd4	126	}
b81fd3e8	127	if ((bp = mi->mi_tab.b_actf) == NULL) {
b81fd3e8 BJ	128	mhp->mh_actf = mi->mi_forw;
	129	goto loop;
	130	}
	131	/*
	132	* If this device isn't present and on-line, then
	133	* we screwed up, and can't really do the operation.
	134	*/
d565635a	135	if ((mi->mi_drv->mbd_ds & MBDS_DREADY) != MBDS_DREADY) {
89bd2f01 BJ	136	printf("%s%d: not ready\n", mi->mi_driver->md_dname,
89bd2f01 BJ	137	dkunit(bp));
b81fd3e8	138	mi->mi_tab.b_actf = bp->av_forw;
3dbaa9da BJ	139	mi->mi_tab.b_errcnt = 0;
3dbaa9da BJ	140	mi->mi_tab.b_active = 0;
b81fd3e8 BJ	141	bp->b_flags \|= B_ERROR;
	142	iodone(bp);
	143	goto loop;
	144	}
	145	/*
	146	* We can do the operation; mark the massbus active
	147	* and let the device start routine setup any necessary
	148	* device state for the transfer (e.g. desired cylinder, etc
	149	* on disks).
	150	*/
	151	mhp->mh_active = 1;
c9e9b65b	152	if (mi->mi_driver->md_start)
b81fd3e8	153	(*mi->mi_driver->md_start)(mi);
b81fd3e8 BJ	154
	155	/*
	156	* Setup the massbus control and map registers and start
	157	* the transfer.
	158	*/
b81fd3e8 BJ	159	mbp = mi->mi_mba;
	160	mbp->mba_sr = -1; /* conservative */
	161	mbp->mba_var = mbasetup(mi);
	162	mbp->mba_bcr = -bp->b_bcount;
	163	mi->mi_drv->mbd_cs1 =
d565635a	164	(bp->b_flags & B_READ) ? MB_RCOM\|MB_GO : MB_WCOM\|MB_GO;
b81fd3e8 BJ	165	if (mi->mi_dk >= 0) {
	166	dk_busy \|= 1 << mi->mi_dk;
	167	dk_xfer[mi->mi_dk]++;
	168	dk_wds[mi->mi_dk] += bp->b_bcount >> 6;
	169	}
	170	}
b5ad10c3	171
b81fd3e8 BJ	172	/*
	173	* Take an interrupt off of massbus mbanum,
	174	* and dispatch to drivers as appropriate.
	175	*/
	176	mbintr(mbanum)
	177	int mbanum;
	178	{
	179	register struct mba_hd *mhp = &mba_hd[mbanum];
	180	register struct mba_regs *mbp = mhp->mh_mba;
89bd2f01	181	register struct mba_device *mi;
80e7c811	182	register struct buf *bp;
b81fd3e8	183	register int drive;
cda4cdd4	184	int mbasr, as;
b81fd3e8 BJ	185
	186	/*
	187	* Read out the massbus status register
	188	* and attention status register and clear
	189	* the bits in same by writing them back.
	190	*/
cda4cdd4 BJ	191	mbasr = mbp->mba_sr;
cda4cdd4 BJ	192	mbp->mba_sr = mbasr;
c9e9b65b	193	#if VAX750
d565635a	194	if (mbasr&MBSR_CBHUNG) {
16e4017f BJ	195	printf("mba%d: control bus hung\n", mbanum);
	196	panic("cbhung");
	197	}
c9e9b65b	198	#endif
b81fd3e8	199	/* note: the mbd_as register is shared between drives */
cda4cdd4	200	as = mbp->mba_drv[0].mbd_as & 0xff;
b81fd3e8	201	mbp->mba_drv[0].mbd_as = as;
b81fd3e8	202
b81fd3e8 BJ	203	/*
	204	* If the mba was active, process the data transfer
	205	* complete interrupt; otherwise just process units which
	206	* are now finished.
	207	*/
	208	if (mhp->mh_active) {
b81fd3e8 BJ	209	/*
b81fd3e8 BJ	210	* Clear attention status for drive whose data
d565635a BJ	211	* transfer related operation completed,
d565635a BJ	212	* and give the dtint driver
b81fd3e8 BJ	213	* routine a chance to say what is next.
	214	*/
	215	mi = mhp->mh_actf;
	216	as &= ~(1 << mi->mi_drive);
	217	dk_busy &= ~(1 << mi->mi_dk);
	218	bp = mi->mi_tab.b_actf;
d565635a	219	switch ((*mi->mi_driver->md_dtint)(mi, mbasr)) {
b81fd3e8 BJ	220
b81fd3e8 BJ	221	case MBD_DONE: /* all done, for better or worse */
b81fd3e8 BJ	222	/*
	223	* Flush request from drive queue.
	224	*/
	225	mi->mi_tab.b_errcnt = 0;
	226	mi->mi_tab.b_actf = bp->av_forw;
	227	iodone(bp);
	228	/* fall into... */
	229	case MBD_RETRY: /* attempt the operation again */
b81fd3e8 BJ	230	/*
	231	* Dequeue data transfer from massbus queue;
	232	* if there is still a i/o request on the device
	233	* queue then start the next operation on the device.
	234	* (Common code for DONE and RETRY).
	235	*/
	236	mhp->mh_active = 0;
	237	mi->mi_tab.b_active = 0;
	238	mhp->mh_actf = mi->mi_forw;
	239	if (mi->mi_tab.b_actf)
	240	mbustart(mi);
	241	break;
	242
	243	case MBD_RESTARTED: /* driver restarted op (ecc, e.g.)
b81fd3e8	244	/*
3dbaa9da	245	* Note that mhp->mh_active is still on.
b81fd3e8 BJ	246	*/
	247	break;
	248
	249	default:
c9e9b65b	250	panic("mbintr");
b81fd3e8	251	}
b81fd3e8	252	}
b81fd3e8 BJ	253	/*
	254	* Service drives which require attention
	255	* after non-data-transfer operations.
	256	*/
cda4cdd4 BJ	257	while (drive = ffs(as)) {
	258	drive--; /* was 1 origin */
	259	as &= ~(1 << drive);
89bd2f01 BJ	260	mi = mhp->mh_mbip[drive];
	261	if (mi == NULL)
	262	continue;
cda4cdd4	263	/*
89bd2f01	264	* If driver has a handler for non-data transfer
d565635a	265	* interrupts, give it a chance to tell us what to do.
cda4cdd4	266	*/
cda4cdd4 BJ	267	if (mi->mi_driver->md_ndint) {
	268	mi->mi_tab.b_active = 0;
	269	switch ((*mi->mi_driver->md_ndint)(mi)) {
b81fd3e8	270
d565635a	271	case MBN_DONE: /* operation completed */
cda4cdd4	272	mi->mi_tab.b_errcnt = 0;
89bd2f01	273	bp = mi->mi_tab.b_actf;
cda4cdd4 BJ	274	mi->mi_tab.b_actf = bp->av_forw;
cda4cdd4 BJ	275	iodone(bp);
d565635a BJ	276	/* fall into common code */
d565635a BJ	277	case MBN_RETRY: /* operation continues */
cda4cdd4 BJ	278	if (mi->mi_tab.b_actf)
	279	mbustart(mi);
	280	break;
d565635a	281	case MBN_SKIP: /* ignore unsol. interrupt */
89bd2f01	282	break;
cda4cdd4 BJ	283	default:
	284	panic("mbintr");
	285	}
	286	} else
d565635a BJ	287	/*
	288	* If there is no non-data transfer interrupt
	289	* routine, then we should just
	290	* restart the unit, leading to a mbstart() soon.
	291	*/
cda4cdd4 BJ	292	mbustart(mi);
cda4cdd4 BJ	293	}
b81fd3e8 BJ	294	/*
	295	* If there is an operation available and
	296	* the massbus isn't active, get it going.
	297	*/
	298	if (mhp->mh_actf && !mhp->mh_active)
	299	mbstart(mhp);
d565635a	300	/* THHHHATS all folks... */
b81fd3e8 BJ	301	}
	302
	303	/*
	304	* Setup the mapping registers for a transfer.
	305	*/
	306	mbasetup(mi)
89bd2f01	307	register struct mba_device *mi;
b5ad10c3	308	{
b81fd3e8 BJ	309	register struct mba_regs *mbap = mi->mi_mba;
b81fd3e8 BJ	310	struct buf *bp = mi->mi_tab.b_actf;
b5ad10c3 BJ	311	register int i;
	312	int npf;
	313	unsigned v;
	314	register struct pte pte, io;
	315	int o;
	316	int vaddr;
b5ad10c3	317	struct proc *rp;
b5ad10c3	318
f9b6e695 BJ	319	io = mbap->mba_map;
	320	v = btop(bp->b_un.b_addr);
	321	o = (int)bp->b_un.b_addr & PGOFSET;
	322	npf = btoc(bp->b_bcount + o);
	323	rp = bp->b_flags&B_DIRTY ? &proc[2] : bp->b_proc;
	324	vaddr = o;
	325	if (bp->b_flags & B_UAREA) {
	326	for (i = 0; i < UPAGES; i++) {
	327	if (rp->p_addr[i].pg_pfnum == 0)
	328	panic("mba: zero upage");
	329	(int )io++ = rp->p_addr[i].pg_pfnum \| PG_V;
	330	}
	331	} else if ((bp->b_flags & B_PHYS) == 0) {
	332	pte = &Sysmap[btop(((int)bp->b_un.b_addr)&0x7fffffff)];
	333	while (--npf >= 0)
	334	(int )io++ = pte++->pg_pfnum \| PG_V;
	335	} else {
	336	if (bp->b_flags & B_PAGET)
	337	pte = &Usrptmap[btokmx((struct pte *)bp->b_un.b_addr)];
	338	else
	339	pte = vtopte(rp, v);
	340	while (--npf >= 0) {
	341	if (pte->pg_pfnum == 0)
	342	panic("mba, zero entry");
	343	(int )io++ = pte++->pg_pfnum \| PG_V;
b5ad10c3 BJ	344	}
b5ad10c3 BJ	345	}
f9b6e695	346	(int )io++ = 0;
b81fd3e8	347	return (vaddr);
b5ad10c3	348	}
16e4017f	349
d565635a BJ	350	/*
	351	* Init and interrupt enable a massbus adapter.
	352	*/
16e4017f BJ	353	mbainit(mp)
	354	struct mba_regs *mp;
	355	{
	356
d565635a BJ	357	mp->mba_cr = MBCR_INIT;
d565635a BJ	358	mp->mba_cr = MBCR_IE;
16e4017f	359	}
443c8066	360	#endif