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

/*	if_acc.c	4.9	82/03/13	*/

#include "acc.h"
#ifdef NACC > 0

/*
 * ACC LH/DH ARPAnet IMP interface driver.
 */

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/mbuf.h"
#include "../h/pte.h"
#include "../h/buf.h"
#include "../h/protosw.h"
#include "../h/socket.h"
#include "../h/ubareg.h"
#include "../h/ubavar.h"
#include "../h/cpu.h"
#include "../h/mtpr.h"
#include "../h/vmmac.h"
#include "../net/in.h"
#include "../net/in_systm.h"
#include "../net/if.h"
#include "../net/if_acc.h"
#include "../net/if_imp.h"
#include "../net/if_uba.h"

int     accprobe(), accattach(), accrint(), accxint();
struct  uba_device *accinfo[NACC];
u_short accstd[] = { 0 };
struct  uba_driver accdriver =
	{ accprobe, 0, accattach, 0, accstd, "acc", accinfo };
#define	ACCUNIT(x)	minor(x)

int	accinit(), accstart(), accreset();

/*
 * "Lower half" of IMP interface driver.
 *
 * Each IMP interface is handled by a common module which handles
 * the IMP-host protocol and a hardware driver which manages the
 * hardware specific details of talking with the IMP.
 *
 * The hardware portion of the IMP driver handles DMA and related
 * management of UNIBUS resources.  The IMP protocol module interprets
 * contents of these messages and "controls" the actions of the
 * hardware module during IMP resets, but not, for instance, during
 * UNIBUS resets.
 *
 * The two modules are coupled at "attach time", and ever after,
 * through the imp interface structure.  Higher level protocols,
 * e.g. IP, interact with the IMP driver, rather than the ACC.
 */
struct	acc_softc {
	struct	ifnet *acc_if;		/* pointer to IMP's ifnet struct */
	struct	impcb *acc_ic;		/* data structure shared with IMP */
	struct	ifuba acc_ifuba;	/* UNIBUS resources */
	struct	mbuf *acc_iq;		/* input reassembly queue */
	short	acc_olen;		/* size of last message sent */
	char	acc_flush;		/* flush remainder of message */
} acc_softc[NACC];

/*
 * Reset the IMP and cause a transmitter interrupt by
 * performing a null DMA.
 */
accprobe(reg)
	caddr_t reg;
{
	register int br, cvec;		/* r11, r10 value-result */
	register struct accdevice *addr = (struct accdevice *)reg;

COUNT(ACCPROBE);
#ifdef lint
	br = 0; cvec = br; br = cvec;
	accrint(0); accxint(0);
#endif
	addr->icsr = ACC_RESET; DELAY(5000);
	addr->ocsr = ACC_RESET; DELAY(5000);
	addr->ocsr = OUT_BBACK; DELAY(5000);
	addr->owc = 0;
	addr->ocsr = ACC_IE | ACC_GO; DELAY(5000);
	addr->ocsr = 0;
	if (cvec && cvec != 0x200)	/* transmit -> receive */
		cvec -= 4;
	return (1);
}

/*
 * Call the IMP module to allow it to set up its internal
 * state, then tie the two modules together by setting up
 * the back pointers to common data structures.
 */
accattach(ui)
	struct uba_device *ui;
{
	register struct acc_softc *sc = &acc_softc[ui->ui_unit];
	register struct impcb *ip;
	struct ifimpcb {
		struct	ifnet ifimp_if;
		struct	impcb ifimp_impcb;
	} *ifimp;

COUNT(ACCATTACH);
	if ((ifimp = (struct ifimpcb *)impattach(ui)) == 0)
		panic("accattach");
	sc->acc_if = &ifimp->ifimp_if;
	ip = &ifimp->ifimp_impcb;
	sc->acc_ic = ip;
	ip->ic_init = accinit;
	ip->ic_start = accstart;
#ifdef notdef
	sc->acc_ifuba.ifu_flags = UBA_NEEDBDP;
#endif
}

/*
 * Reset interface after UNIBUS reset.
 * If interface is on specified uba, reset its state.
 */
accreset(unit, uban)
	int unit, uban;
{
	register struct uba_device *ui;
	struct acc_softc *sc;

COUNT(ACCRESET);
	if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0 ||
	    ui->ui_ubanum != uban)
		return;
	printf(" acc%d", unit);
	sc = &acc_softc[unit];
	/* must go through IMP to allow it to set state */
	(*sc->acc_if->if_init)(unit);
}

/*
 * Initialize interface: clear recorded pending operations,
 * and retrieve, and initialize UNIBUS resources.  Note
 * return value is used by IMP init routine to mark IMP
 * unavailable for outgoing traffic.
 */
accinit(unit)
	int unit;
{	
	register struct acc_softc *sc;
	register struct uba_device *ui;
	register struct accdevice *addr;
	int x, info;

COUNT(ACCINIT);
	if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0) {
		printf("acc%d: not alive\n", unit);
		return (0);
	}
	sc = &acc_softc[unit];
	/*
	 * Header length is 0 since we have to passs
	 * the IMP leader up to the protocol interpretation
	 * routines.  If we had the header length as
	 * sizeof(struct imp_leader), then the if_ routines
	 * would asssume we handle it on input and output.
	 */
	if (if_ubainit(&sc->acc_ifuba, ui->ui_ubanum, 0,
	     (int)btoc(IMP_MTU)) == 0) {
		printf("acc%d: can't initialize\n", unit);
		goto down;
	}
	addr = (struct accdevice *)ui->ui_addr;

	/*
	 * Reset the imp interface;
	 * the delays are pure guesswork.
	 */
	x = spl5();
	addr->icsr = ACC_RESET; DELAY(5000);
        addr->ocsr = ACC_RESET; DELAY(5000);
	addr->ocsr = OUT_BBACK;	DELAY(1000);	/* reset host master ready */
	addr->ocsr = 0;
	splx(x);
	addr->icsr = IN_MRDY | IN_WEN;		/* close the relay */
	DELAY(5000);
	/* YECH!!! */
	x = 500;
	while (x-- > 0) {
		if ((addr->icsr & IN_HRDY) ||
		    (addr->icsr & (IN_RMR | IN_IMPBSY)) == 0)
			break;
		addr->icsr = IN_MRDY | IN_WEN;
		DELAY(5000);			/* keep turning IN_RMR off */
	}
	if (x <= 0) {
		printf("acc%d: imp doesn't respond, icsr=%b\n", unit,
			addr->icsr, ACC_INBITS);
		goto down;
	}

	/*
	 * Put up a read.  We can't restart any outstanding writes
	 * until we're back in synch with the IMP (i.e. we've flushed
	 * the NOOPs it throws at us).
	 * Note: IMP_MTU includes the leader.
	 */
	x = spl5();
	info = sc->acc_ifuba.ifu_r.ifrw_info;
	addr->iba = (u_short)info;
	addr->iwc = -(IMP_MTU >> 1);
#ifdef LOOPBACK
	addr->ocsr |= OUT_BBACK;
#endif
	addr->icsr = 
		IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
	splx(x);
	return (1);
down:
	ui->ui_alive = 0;
	return (0);
}

/*
 * Start output on an interface.
 */
accstart(dev)
	dev_t dev;
{
	int unit = ACCUNIT(dev), info;
	register struct acc_softc *sc = &acc_softc[unit];
	register struct accdevice *addr;
	struct mbuf *m;
	u_short cmd;

COUNT(ACCSTART);
	if (sc->acc_ic->ic_oactive)
		goto restart;
	
	/*
	 * Not already active, deqeue a request and
	 * map it onto the UNIBUS.  If no more
	 * requeusts, just return.
	 */
	IF_DEQUEUE(&sc->acc_if->if_snd, m);
	if (m == 0) {
		sc->acc_ic->ic_oactive = 0;
		return;
	}
	sc->acc_olen = if_wubaput(&sc->acc_ifuba, m);

restart:
	/*
	 * Have request mapped to UNIBUS for
	 * transmission; start the output.
	 */
	if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
		UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp);
	addr = (struct accdevice *)accinfo[unit]->ui_addr;
	info = sc->acc_ifuba.ifu_w.ifrw_info;
	addr->oba = (u_short)info;
	addr->owc = -((sc->acc_olen + 1) >> 1);
	cmd = ACC_IE | OUT_ENLB | ((info & 0x30000) >> 12) | ACC_GO;
#ifdef LOOPBACK
	cmd |= OUT_BBACK;
#endif
	addr->ocsr = cmd;
	sc->acc_ic->ic_oactive = 1;
}

/*
 * Output interrupt handler.
 */
accxint(unit)
{
	register struct acc_softc *sc = &acc_softc[unit];
	register struct accdevice *addr;

COUNT(ACCXINT);
	if (sc->acc_ic->ic_oactive == 0) {
		printf("acc%d: stray xmit interrupt\n", unit);
		return;
	}
	addr = (struct accdevice *)accinfo[unit]->ui_addr;
	sc->acc_if->if_opackets++;
	sc->acc_ic->ic_oactive = 0;
	if (addr->ocsr & ACC_ERR) {
		printf("acc%d: output error, csr=%b\n", unit,
			addr->ocsr, ACC_OUTBITS);
		sc->acc_if->if_oerrors++;
	}
	if (sc->acc_ifuba.ifu_xtofree) {
		m_freem(sc->acc_ifuba.ifu_xtofree);
		sc->acc_ifuba.ifu_xtofree = 0;
	}
	if (sc->acc_if->if_snd.ifq_head)
		accstart(unit);
}

/*
 * Input interrupt handler
 */
accrint(unit)
{
	register struct acc_softc *sc = &acc_softc[unit];
	register struct accdevice *addr;
    	struct mbuf *m;
	int len, info;

COUNT(ACCRINT);
	sc->acc_if->if_ipackets++;

	/*
	 * Purge BDP; flush message if error indicated.
	 */
	if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
		UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp);
	addr = (struct accdevice *)accinfo[unit]->ui_addr;
	if (addr->icsr & ACC_ERR) {
		printf("acc%d: input error, csr=%b\n", unit,
		    addr->icsr, ACC_INBITS);
		sc->acc_if->if_ierrors++;
		sc->acc_flush = 1;
	}

	if (sc->acc_flush) {
		if (addr->icsr & IN_EOM)
			sc->acc_flush = 0;
		goto setup;
	}
	len = IMP_MTU + (addr->iwc << 1);
	if (len < 0 || len > IMP_MTU) {
		printf("acc%d: bad length=%d\n", len);
		sc->acc_if->if_ierrors++;
		goto setup;
	}

	/*
	 * The last parameter is always 0 since using
	 * trailers on the ARPAnet is insane.
	 */
	m = if_rubaget(&sc->acc_ifuba, len, 0);
	if (m == 0)
		goto setup;
	if ((addr->icsr & IN_EOM) == 0) {
		if (sc->acc_iq)
			m_cat(sc->acc_iq, m);
		else
			sc->acc_iq = m;
		goto setup;
	}
	if (sc->acc_iq) {
		m_cat(sc->acc_iq, m);
		m = sc->acc_iq;
		sc->acc_iq = 0;
	}
	impinput(unit, m);

setup:
	/*
	 * Setup for next message.
	 */
	info = sc->acc_ifuba.ifu_r.ifrw_info;
	addr->iba = (u_short)info;
	addr->iwc = -(IMP_MTU >> 1);
	addr->icsr =
		IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
}
#endif
Commit	Line	Data
668cc26d	1	/* if_acc.c 4.9 82/03/13 */
28081cf8 SL	2
	3	#include "acc.h"
	4	#ifdef NACC > 0
	5
	6	/*
	7	* ACC LH/DH ARPAnet IMP interface driver.
	8	*/
	9
	10	#include "../h/param.h"
	11	#include "../h/systm.h"
	12	#include "../h/mbuf.h"
	13	#include "../h/pte.h"
	14	#include "../h/buf.h"
	15	#include "../h/protosw.h"
	16	#include "../h/socket.h"
	17	#include "../h/ubareg.h"
	18	#include "../h/ubavar.h"
28081cf8 SL	19	#include "../h/cpu.h"
	20	#include "../h/mtpr.h"
	21	#include "../h/vmmac.h"
	22	#include "../net/in.h"
	23	#include "../net/in_systm.h"
	24	#include "../net/if.h"
a2cd4df7	25	#include "../net/if_acc.h"
28081cf8 SL	26	#include "../net/if_imp.h"
	27	#include "../net/if_uba.h"
	28
	29	int accprobe(), accattach(), accrint(), accxint();
	30	struct uba_device *accinfo[NACC];
	31	u_short accstd[] = { 0 };
	32	struct uba_driver accdriver =
	33	{ accprobe, 0, accattach, 0, accstd, "acc", accinfo };
	34	#define ACCUNIT(x) minor(x)
	35
	36	int accinit(), accstart(), accreset();
	37
	38	/*
	39	* "Lower half" of IMP interface driver.
	40	*
	41	* Each IMP interface is handled by a common module which handles
	42	* the IMP-host protocol and a hardware driver which manages the
	43	* hardware specific details of talking with the IMP.
	44	*
	45	* The hardware portion of the IMP driver handles DMA and related
	46	* management of UNIBUS resources. The IMP protocol module interprets
	47	* contents of these messages and "controls" the actions of the
	48	* hardware module during IMP resets, but not, for instance, during
	49	* UNIBUS resets.
	50	*
	51	* The two modules are coupled at "attach time", and ever after,
	52	* through the imp interface structure. Higher level protocols,
	53	* e.g. IP, interact with the IMP driver, rather than the ACC.
	54	*/
	55	struct acc_softc {
	56	struct ifnet acc_if; / pointer to IMP's ifnet struct */
	57	struct impcb acc_ic; / data structure shared with IMP */
	58	struct ifuba acc_ifuba; /* UNIBUS resources */
	59	struct mbuf acc_iq; / input reassembly queue */
	60	short acc_olen; /* size of last message sent */
	61	char acc_flush; /* flush remainder of message */
28081cf8 SL	62	} acc_softc[NACC];
	63
	64	/*
	65	* Reset the IMP and cause a transmitter interrupt by
	66	* performing a null DMA.
	67	*/
	68	accprobe(reg)
	69	caddr_t reg;
	70	{
	71	register int br, cvec; /* r11, r10 value-result */
	72	register struct accdevice addr = (struct accdevice )reg;
	73
	74	COUNT(ACCPROBE);
	75	#ifdef lint
	76	br = 0; cvec = br; br = cvec;
	77	accrint(0); accxint(0);
	78	#endif
a2cd4df7 BJ	79	addr->icsr = ACC_RESET; DELAY(5000);
	80	addr->ocsr = ACC_RESET; DELAY(5000);
	81	addr->ocsr = OUT_BBACK; DELAY(5000);
	82	addr->owc = 0;
	83	addr->ocsr = ACC_IE \| ACC_GO; DELAY(5000);
	84	addr->ocsr = 0;
	85	if (cvec && cvec != 0x200) /* transmit -> receive */
28081cf8 SL	86	cvec -= 4;
	87	return (1);
	88	}
	89
	90	/*
	91	* Call the IMP module to allow it to set up its internal
	92	* state, then tie the two modules together by setting up
	93	* the back pointers to common data structures.
	94	*/
	95	accattach(ui)
	96	struct uba_device *ui;
	97	{
	98	register struct acc_softc *sc = &acc_softc[ui->ui_unit];
	99	register struct impcb *ip;
	100	struct ifimpcb {
	101	struct ifnet ifimp_if;
	102	struct impcb ifimp_impcb;
	103	} *ifimp;
	104
	105	COUNT(ACCATTACH);
	106	if ((ifimp = (struct ifimpcb *)impattach(ui)) == 0)
a2cd4df7	107	panic("accattach");
28081cf8 SL	108	sc->acc_if = &ifimp->ifimp_if;
	109	ip = &ifimp->ifimp_impcb;
	110	sc->acc_ic = ip;
	111	ip->ic_init = accinit;
	112	ip->ic_start = accstart;
a2cd4df7 BJ	113	#ifdef notdef
	114	sc->acc_ifuba.ifu_flags = UBA_NEEDBDP;
	115	#endif
28081cf8 SL	116	}
	117
	118	/*
	119	* Reset interface after UNIBUS reset.
	120	* If interface is on specified uba, reset its state.
	121	*/
	122	accreset(unit, uban)
	123	int unit, uban;
	124	{
	125	register struct uba_device *ui;
	126	struct acc_softc *sc;
	127
	128	COUNT(ACCRESET);
	129	if (unit >= NACC \|\| (ui = accinfo[unit]) == 0 \|\| ui->ui_alive == 0 \|\|
	130	ui->ui_ubanum != uban)
	131	return;
	132	printf(" acc%d", unit);
	133	sc = &acc_softc[unit];
	134	/* must go through IMP to allow it to set state */
	135	(*sc->acc_if->if_init)(unit);
	136	}
	137
	138	/*
	139	* Initialize interface: clear recorded pending operations,
a2cd4df7 BJ	140	* and retrieve, and initialize UNIBUS resources. Note
	141	* return value is used by IMP init routine to mark IMP
	142	* unavailable for outgoing traffic.
28081cf8 SL	143	*/
	144	accinit(unit)
	145	int unit;
	146	{
a2cd4df7 BJ	147	register struct acc_softc *sc;
a2cd4df7 BJ	148	register struct uba_device *ui;
28081cf8 SL	149	register struct accdevice *addr;
	150	int x, info;
	151
	152	COUNT(ACCINIT);
a2cd4df7 BJ	153	if (unit >= NACC \|\| (ui = accinfo[unit]) == 0 \|\| ui->ui_alive == 0) {
	154	printf("acc%d: not alive\n", unit);
	155	return (0);
	156	}
	157	sc = &acc_softc[unit];
	158	/*
	159	* Header length is 0 since we have to passs
	160	* the IMP leader up to the protocol interpretation
	161	* routines. If we had the header length as
	162	* sizeof(struct imp_leader), then the if_ routines
	163	* would asssume we handle it on input and output.
	164	*/
668cc26d SL	165	if (if_ubainit(&sc->acc_ifuba, ui->ui_ubanum, 0,
668cc26d SL	166	(int)btoc(IMP_MTU)) == 0) {
28081cf8	167	printf("acc%d: can't initialize\n", unit);
a2cd4df7	168	goto down;
28081cf8 SL	169	}
	170	addr = (struct accdevice *)ui->ui_addr;
	171
a0b7c7fb	172	/*
a2cd4df7 BJ	173	* Reset the imp interface;
a2cd4df7 BJ	174	* the delays are pure guesswork.
a0b7c7fb	175	*/
28081cf8	176	x = spl5();
a2cd4df7 BJ	177	addr->icsr = ACC_RESET; DELAY(5000);
	178	addr->ocsr = ACC_RESET; DELAY(5000);
	179	addr->ocsr = OUT_BBACK; DELAY(1000); /* reset host master ready */
	180	addr->ocsr = 0;
28081cf8	181	splx(x);
3fb22247 BJ	182	addr->icsr = IN_MRDY \| IN_WEN; /* close the relay */
3fb22247 BJ	183	DELAY(5000);
28081cf8	184	/* YECH!!! */
a2cd4df7 BJ	185	x = 500;
	186	while (x-- > 0) {
	187	if ((addr->icsr & IN_HRDY) \|\|
d49cf621	188	(addr->icsr & (IN_RMR \| IN_IMPBSY)) == 0)
a2cd4df7	189	break;
3fb22247 BJ	190	addr->icsr = IN_MRDY \| IN_WEN;
3fb22247 BJ	191	DELAY(5000); /* keep turning IN_RMR off */
a2cd4df7 BJ	192	}
	193	if (x <= 0) {
	194	printf("acc%d: imp doesn't respond, icsr=%b\n", unit,
	195	addr->icsr, ACC_INBITS);
	196	goto down;
28081cf8 SL	197	}
	198
	199	/*
	200	* Put up a read. We can't restart any outstanding writes
	201	* until we're back in synch with the IMP (i.e. we've flushed
	202	* the NOOPs it throws at us).
a2cd4df7	203	* Note: IMP_MTU includes the leader.
28081cf8 SL	204	*/
	205	x = spl5();
	206	info = sc->acc_ifuba.ifu_r.ifrw_info;
a2cd4df7 BJ	207	addr->iba = (u_short)info;
	208	addr->iwc = -(IMP_MTU >> 1);
	209	#ifdef LOOPBACK
	210	addr->ocsr \|= OUT_BBACK;
	211	#endif
	212	addr->icsr =
28081cf8 SL	213	IN_MRDY \| ACC_IE \| IN_WEN \| ((info & 0x30000) >> 12) \| ACC_GO;
28081cf8 SL	214	splx(x);
a2cd4df7 BJ	215	return (1);
	216	down:
	217	ui->ui_alive = 0;
	218	return (0);
28081cf8 SL	219	}
	220
	221	/*
	222	* Start output on an interface.
	223	*/
	224	accstart(dev)
	225	dev_t dev;
	226	{
	227	int unit = ACCUNIT(dev), info;
28081cf8 SL	228	register struct acc_softc *sc = &acc_softc[unit];
	229	register struct accdevice *addr;
	230	struct mbuf *m;
	231	u_short cmd;
	232
	233	COUNT(ACCSTART);
	234	if (sc->acc_ic->ic_oactive)
	235	goto restart;
	236
	237	/*
	238	* Not already active, deqeue a request and
	239	* map it onto the UNIBUS. If no more
	240	* requeusts, just return.
	241	*/
	242	IF_DEQUEUE(&sc->acc_if->if_snd, m);
	243	if (m == 0) {
	244	sc->acc_ic->ic_oactive = 0;
	245	return;
	246	}
	247	sc->acc_olen = if_wubaput(&sc->acc_ifuba, m);
	248
	249	restart:
	250	/*
a2cd4df7 BJ	251	* Have request mapped to UNIBUS for
a2cd4df7 BJ	252	* transmission; start the output.
28081cf8	253	*/
a2cd4df7 BJ	254	if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
a2cd4df7 BJ	255	UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp);
bcb5db7d	256	addr = (struct accdevice *)accinfo[unit]->ui_addr;
28081cf8	257	info = sc->acc_ifuba.ifu_w.ifrw_info;
a2cd4df7 BJ	258	addr->oba = (u_short)info;
a2cd4df7 BJ	259	addr->owc = -((sc->acc_olen + 1) >> 1);
28081cf8	260	cmd = ACC_IE \| OUT_ENLB \| ((info & 0x30000) >> 12) \| ACC_GO;
a2cd4df7 BJ	261	#ifdef LOOPBACK
	262	cmd \|= OUT_BBACK;
	263	#endif
	264	addr->ocsr = cmd;
28081cf8 SL	265	sc->acc_ic->ic_oactive = 1;
	266	}
	267
	268	/*
	269	* Output interrupt handler.
	270	*/
	271	accxint(unit)
	272	{
28081cf8 SL	273	register struct acc_softc *sc = &acc_softc[unit];
	274	register struct accdevice *addr;
	275
	276	COUNT(ACCXINT);
	277	if (sc->acc_ic->ic_oactive == 0) {
a2cd4df7	278	printf("acc%d: stray xmit interrupt\n", unit);
28081cf8 SL	279	return;
28081cf8 SL	280	}
bcb5db7d	281	addr = (struct accdevice *)accinfo[unit]->ui_addr;
28081cf8 SL	282	sc->acc_if->if_opackets++;
28081cf8 SL	283	sc->acc_ic->ic_oactive = 0;
a2cd4df7 BJ	284	if (addr->ocsr & ACC_ERR) {
	285	printf("acc%d: output error, csr=%b\n", unit,
	286	addr->ocsr, ACC_OUTBITS);
28081cf8	287	sc->acc_if->if_oerrors++;
a0b7c7fb	288	}
a2cd4df7 BJ	289	if (sc->acc_ifuba.ifu_xtofree) {
	290	m_freem(sc->acc_ifuba.ifu_xtofree);
	291	sc->acc_ifuba.ifu_xtofree = 0;
28081cf8	292	}
41e530c7 BJ	293	if (sc->acc_if->if_snd.ifq_head)
41e530c7 BJ	294	accstart(unit);
28081cf8 SL	295	}
	296
	297	/*
	298	* Input interrupt handler
	299	*/
	300	accrint(unit)
	301	{
	302	register struct acc_softc *sc = &acc_softc[unit];
	303	register struct accdevice *addr;
28081cf8 SL	304	struct mbuf *m;
	305	int len, info;
	306
	307	COUNT(ACCRINT);
	308	sc->acc_if->if_ipackets++;
	309
	310	/*
	311	* Purge BDP; flush message if error indicated.
	312	*/
a2cd4df7 BJ	313	if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
a2cd4df7 BJ	314	UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp);
28081cf8	315	addr = (struct accdevice *)accinfo[unit]->ui_addr;
a2cd4df7 BJ	316	if (addr->icsr & ACC_ERR) {
	317	printf("acc%d: input error, csr=%b\n", unit,
	318	addr->icsr, ACC_INBITS);
28081cf8 SL	319	sc->acc_if->if_ierrors++;
	320	sc->acc_flush = 1;
	321	}
	322
	323	if (sc->acc_flush) {
a2cd4df7	324	if (addr->icsr & IN_EOM)
28081cf8 SL	325	sc->acc_flush = 0;
	326	goto setup;
	327	}
a2cd4df7	328	len = IMP_MTU + (addr->iwc << 1);
a2cd4df7 BJ	329	if (len < 0 \|\| len > IMP_MTU) {
	330	printf("acc%d: bad length=%d\n", len);
	331	sc->acc_if->if_ierrors++;
	332	goto setup;
	333	}
28081cf8 SL	334
	335	/*
	336	* The last parameter is always 0 since using
	337	* trailers on the ARPAnet is insane.
	338	*/
	339	m = if_rubaget(&sc->acc_ifuba, len, 0);
	340	if (m == 0)
	341	goto setup;
a2cd4df7	342	if ((addr->icsr & IN_EOM) == 0) {
a0b7c7fb	343	if (sc->acc_iq)
28081cf8	344	m_cat(sc->acc_iq, m);
a0b7c7fb	345	else
28081cf8	346	sc->acc_iq = m;
28081cf8 SL	347	goto setup;
28081cf8 SL	348	}
a0b7c7fb	349	if (sc->acc_iq) {
28081cf8 SL	350	m_cat(sc->acc_iq, m);
	351	m = sc->acc_iq;
	352	sc->acc_iq = 0;
28081cf8 SL	353	}
	354	impinput(unit, m);
	355
	356	setup:
	357	/*
	358	* Setup for next message.
	359	*/
	360	info = sc->acc_ifuba.ifu_r.ifrw_info;
a2cd4df7 BJ	361	addr->iba = (u_short)info;
	362	addr->iwc = -(IMP_MTU >> 1);
	363	addr->icsr =
28081cf8 SL	364	IN_MRDY \| ACC_IE \| IN_WEN \| ((info & 0x30000) >> 12) \| ACC_GO;
	365	}
	366	#endif