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

/*	if_acc.c	4.16	82/06/14	*/

#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];

#define	NACCDEBUG	10000
char	accdebug[NACCDEBUG];
int	accdebugx;

/*
 * 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->icsr = ACC_RESET; DELAY(5000);
	addr->ocsr = ACC_RESET; DELAY(5000);
	if (cvec && cvec != 0x200)	/* transmit -> receive */
		cvec -= 4;
#ifdef ECHACK
	br = 0x16;
#endif
	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;
	sc->acc_ifuba.ifu_flags = UBA_CANTWAIT;
#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 info, i;

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(IMPMTU)) == 0) {
		printf("acc%d: can't initialize\n", unit);
		ui->ui_alive = 0;
		return (0);
	}
	addr = (struct accdevice *)ui->ui_addr;

	/*
	 * Reset the imp interface;
	 * the delays are pure guesswork.
	 */
        addr->ocsr = ACC_RESET; DELAY(5000);
	addr->ocsr = OUT_BBACK;	DELAY(5000);	/* reset host master ready */
	addr->ocsr = 0;
	if (accinputreset(addr, unit) == 0) {
		ui->ui_alive = 0;
		return (0);
	}

	/*
	 * 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: IMPMTU includes the leader.
	 */
	acctrace("init", addr->icsr);
	info = sc->acc_ifuba.ifu_r.ifrw_info;
	addr->iba = (u_short)info;
	addr->iwc = -(IMPMTU >> 1);
#ifdef LOOPBACK
	addr->ocsr |= OUT_BBACK;
#endif
	addr->icsr = 
		IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
	return (1);
}

accinputreset(addr, unit)
	register struct accdevice *addr;
	register int unit;
{
	register int i;

	addr->icsr = ACC_RESET; DELAY(5000);
	addr->icsr = IN_MRDY | IN_WEN;		/* close the relay */
	DELAY(10000);
	/* YECH!!! */
	for (i = 0; i < 500; i++) {
		if ((addr->icsr & IN_HRDY) ||
		    (addr->icsr & (IN_RMR | IN_IMPBSY)) == 0)
			return (1);
		addr->icsr = IN_MRDY | IN_WEN; DELAY(10000);
		/* keep turning IN_RMR off */
	}
	printf("acc%d: imp doesn't respond, icsr=%b\n", unit,
		addr->icsr, ACC_INBITS);
	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);
	acctrace("start", sc->acc_ic->ic_oactive);
	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) {
		acctrace("q empty", 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);
	acctrace("xint", sc->acc_ic->ic_oactive);
	addr = (struct accdevice *)accinfo[unit]->ui_addr;
	if (sc->acc_ic->ic_oactive == 0) {
		printf("acc%d: stray xmit interrupt, csr=%b\n", unit,
			addr->ocsr, ACC_OUTBITS);
		addr->ocsr  = ACC_RESET; 
		return;
	}
	acctrace("ocsr", addr->ocsr);
	sc->acc_if->if_opackets++;
	sc->acc_ic->ic_oactive = 0;
	if (addr->ocsr & (ACC_ERR|OUT_TMR)) {
		printf("acc%d: output error, ocsr=%b, icsr=%b\n", unit,
			addr->ocsr, ACC_OUTBITS, addr->icsr, ACC_INBITS);
		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);
	addr = (struct accdevice *)accinfo[unit]->ui_addr;
	if ((addr->icsr & ACC_RDY) == 0) {
		printf("acc%d: stray input interrupt\n", unit);
		accinputreset(addr, unit);
		goto setup;
	}
	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);
	acctrace("rint", addr->icsr);
	if (addr->icsr & (ACC_ERR|IN_RMR)) {
		printf("acc%d: input error, icsr=%b, ocsr=%b\n", unit,
		    addr->icsr, ACC_INBITS, addr->ocsr, ACC_OUTBITS);
		sc->acc_if->if_ierrors++;
		if (addr->icsr & IN_RMR)
			accinputreset(addr, unit);
		sc->acc_flush = 1;
	}

	acctrace("flush", sc->acc_flush);
	if (sc->acc_flush) {
		if (addr->icsr & IN_EOM)
			sc->acc_flush = 0;
		goto setup;
	}
	len = IMPMTU + (addr->iwc << 1);
	acctrace("length", len);
	if (len < 0 || len > IMPMTU) {
		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;
	}
	acctrace("impinput", 0);
	impinput(unit, m);

setup:
	/*
	 * Setup for next message.
	 */
	info = sc->acc_ifuba.ifu_r.ifrw_info;
	addr->iba = (u_short)info;
	addr->iwc = -(IMPMTU >> 1);
	addr->icsr =
		IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
}

int	accprintf = 0;

acctrace(cmd, value)
	char *cmd;
	int value;
{
	register int i;
	register char *p = (char *)&value;

	if (accprintf)
		printf("%s: %x", cmd, value);
	do {
		if (accdebugx >= NACCDEBUG)
			accdebugx = 0;
		accdebug[accdebugx++] = *cmd;
	} while (*cmd++);
	for (i = 0; i < sizeof (int); i++) {
		if (accdebugx >= NACCDEBUG)
			accdebugx = 0;
		accdebug[accdebugx++] = *p++;
	}
}
#endif
Commit	Line	Data
7dfb87a5	1	/* if_acc.c 4.16 82/06/14 */
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];
28081cf8 SL	63
7dfb87a5 SL	64	#define NACCDEBUG 10000
	65	char accdebug[NACCDEBUG];
	66	int accdebugx;
	67
28081cf8 SL	68	/*
	69	* Reset the IMP and cause a transmitter interrupt by
	70	* performing a null DMA.
	71	*/
	72	accprobe(reg)
	73	caddr_t reg;
	74	{
	75	register int br, cvec; /* r11, r10 value-result */
	76	register struct accdevice addr = (struct accdevice )reg;
	77
	78	COUNT(ACCPROBE);
	79	#ifdef lint
	80	br = 0; cvec = br; br = cvec;
	81	accrint(0); accxint(0);
	82	#endif
a2cd4df7 BJ	83	addr->icsr = ACC_RESET; DELAY(5000);
	84	addr->ocsr = ACC_RESET; DELAY(5000);
	85	addr->ocsr = OUT_BBACK; DELAY(5000);
	86	addr->owc = 0;
	87	addr->ocsr = ACC_IE \| ACC_GO; DELAY(5000);
7dfb87a5 SL	88	addr->icsr = ACC_RESET; DELAY(5000);
7dfb87a5 SL	89	addr->ocsr = ACC_RESET; DELAY(5000);
a2cd4df7	90	if (cvec && cvec != 0x200) /* transmit -> receive */
28081cf8	91	cvec -= 4;
7d6f1cd5 SL	92	#ifdef ECHACK
	93	br = 0x16;
	94	#endif
28081cf8 SL	95	return (1);
	96	}
	97
	98	/*
	99	* Call the IMP module to allow it to set up its internal
	100	* state, then tie the two modules together by setting up
	101	* the back pointers to common data structures.
	102	*/
	103	accattach(ui)
	104	struct uba_device *ui;
	105	{
	106	register struct acc_softc *sc = &acc_softc[ui->ui_unit];
	107	register struct impcb *ip;
	108	struct ifimpcb {
	109	struct ifnet ifimp_if;
	110	struct impcb ifimp_impcb;
	111	} *ifimp;
	112
	113	COUNT(ACCATTACH);
	114	if ((ifimp = (struct ifimpcb *)impattach(ui)) == 0)
a2cd4df7	115	panic("accattach");
28081cf8 SL	116	sc->acc_if = &ifimp->ifimp_if;
	117	ip = &ifimp->ifimp_impcb;
	118	sc->acc_ic = ip;
	119	ip->ic_init = accinit;
	120	ip->ic_start = accstart;
7dfb87a5	121	sc->acc_ifuba.ifu_flags = UBA_CANTWAIT;
a2cd4df7	122	#ifdef notdef
7dfb87a5	123	sc->acc_ifuba.ifu_flags \|= UBA_NEEDBDP;
a2cd4df7	124	#endif
28081cf8 SL	125	}
	126
	127	/*
	128	* Reset interface after UNIBUS reset.
	129	* If interface is on specified uba, reset its state.
	130	*/
	131	accreset(unit, uban)
	132	int unit, uban;
	133	{
	134	register struct uba_device *ui;
	135	struct acc_softc *sc;
	136
	137	COUNT(ACCRESET);
	138	if (unit >= NACC \|\| (ui = accinfo[unit]) == 0 \|\| ui->ui_alive == 0 \|\|
	139	ui->ui_ubanum != uban)
	140	return;
	141	printf(" acc%d", unit);
	142	sc = &acc_softc[unit];
	143	/* must go through IMP to allow it to set state */
	144	(*sc->acc_if->if_init)(unit);
	145	}
	146
	147	/*
	148	* Initialize interface: clear recorded pending operations,
a2cd4df7 BJ	149	* and retrieve, and initialize UNIBUS resources. Note
	150	* return value is used by IMP init routine to mark IMP
	151	* unavailable for outgoing traffic.
28081cf8 SL	152	*/
	153	accinit(unit)
	154	int unit;
	155	{
a2cd4df7 BJ	156	register struct acc_softc *sc;
a2cd4df7 BJ	157	register struct uba_device *ui;
28081cf8	158	register struct accdevice *addr;
521c9128	159	int info, i;
28081cf8 SL	160
28081cf8 SL	161	COUNT(ACCINIT);
a2cd4df7 BJ	162	if (unit >= NACC \|\| (ui = accinfo[unit]) == 0 \|\| ui->ui_alive == 0) {
	163	printf("acc%d: not alive\n", unit);
	164	return (0);
	165	}
	166	sc = &acc_softc[unit];
	167	/*
	168	* Header length is 0 since we have to passs
	169	* the IMP leader up to the protocol interpretation
	170	* routines. If we had the header length as
	171	* sizeof(struct imp_leader), then the if_ routines
	172	* would asssume we handle it on input and output.
	173	*/
668cc26d	174	if (if_ubainit(&sc->acc_ifuba, ui->ui_ubanum, 0,
e431883e	175	(int)btoc(IMPMTU)) == 0) {
28081cf8	176	printf("acc%d: can't initialize\n", unit);
7dfb87a5 SL	177	ui->ui_alive = 0;
7dfb87a5 SL	178	return (0);
28081cf8 SL	179	}
	180	addr = (struct accdevice *)ui->ui_addr;
	181
a0b7c7fb	182	/*
a2cd4df7 BJ	183	* Reset the imp interface;
a2cd4df7 BJ	184	* the delays are pure guesswork.
a0b7c7fb	185	*/
a2cd4df7	186	addr->ocsr = ACC_RESET; DELAY(5000);
8129679e	187	addr->ocsr = OUT_BBACK; DELAY(5000); /* reset host master ready */
a2cd4df7	188	addr->ocsr = 0;
7dfb87a5 SL	189	if (accinputreset(addr, unit) == 0) {
	190	ui->ui_alive = 0;
	191	return (0);
a2cd4df7	192	}
28081cf8 SL	193
	194	/*
	195	* Put up a read. We can't restart any outstanding writes
	196	* until we're back in synch with the IMP (i.e. we've flushed
	197	* the NOOPs it throws at us).
e431883e	198	* Note: IMPMTU includes the leader.
28081cf8	199	*/
7dfb87a5	200	acctrace("init", addr->icsr);
28081cf8	201	info = sc->acc_ifuba.ifu_r.ifrw_info;
a2cd4df7	202	addr->iba = (u_short)info;
e431883e	203	addr->iwc = -(IMPMTU >> 1);
a2cd4df7 BJ	204	#ifdef LOOPBACK
	205	addr->ocsr \|= OUT_BBACK;
	206	#endif
	207	addr->icsr =
28081cf8	208	IN_MRDY \| ACC_IE \| IN_WEN \| ((info & 0x30000) >> 12) \| ACC_GO;
a2cd4df7	209	return (1);
28081cf8 SL	210	}
28081cf8 SL	211
7dfb87a5 SL	212	accinputreset(addr, unit)
	213	register struct accdevice *addr;
	214	register int unit;
	215	{
	216	register int i;
	217
	218	addr->icsr = ACC_RESET; DELAY(5000);
	219	addr->icsr = IN_MRDY \| IN_WEN; /* close the relay */
	220	DELAY(10000);
	221	/* YECH!!! */
	222	for (i = 0; i < 500; i++) {
	223	if ((addr->icsr & IN_HRDY) \|\|
	224	(addr->icsr & (IN_RMR \| IN_IMPBSY)) == 0)
	225	return (1);
	226	addr->icsr = IN_MRDY \| IN_WEN; DELAY(10000);
	227	/* keep turning IN_RMR off */
	228	}
	229	printf("acc%d: imp doesn't respond, icsr=%b\n", unit,
	230	addr->icsr, ACC_INBITS);
	231	return (0);
	232	}
	233
28081cf8 SL	234	/*
	235	* Start output on an interface.
	236	*/
	237	accstart(dev)
	238	dev_t dev;
	239	{
	240	int unit = ACCUNIT(dev), info;
28081cf8 SL	241	register struct acc_softc *sc = &acc_softc[unit];
	242	register struct accdevice *addr;
	243	struct mbuf *m;
	244	u_short cmd;
	245
	246	COUNT(ACCSTART);
7dfb87a5	247	acctrace("start", sc->acc_ic->ic_oactive);
28081cf8 SL	248	if (sc->acc_ic->ic_oactive)
	249	goto restart;
	250
	251	/*
	252	* Not already active, deqeue a request and
	253	* map it onto the UNIBUS. If no more
	254	* requeusts, just return.
	255	*/
	256	IF_DEQUEUE(&sc->acc_if->if_snd, m);
	257	if (m == 0) {
7dfb87a5	258	acctrace("q empty", 0);
28081cf8 SL	259	sc->acc_ic->ic_oactive = 0;
	260	return;
	261	}
	262	sc->acc_olen = if_wubaput(&sc->acc_ifuba, m);
	263
	264	restart:
	265	/*
a2cd4df7 BJ	266	* Have request mapped to UNIBUS for
a2cd4df7 BJ	267	* transmission; start the output.
28081cf8	268	*/
a2cd4df7 BJ	269	if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
a2cd4df7 BJ	270	UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp);
bcb5db7d	271	addr = (struct accdevice *)accinfo[unit]->ui_addr;
28081cf8	272	info = sc->acc_ifuba.ifu_w.ifrw_info;
a2cd4df7 BJ	273	addr->oba = (u_short)info;
a2cd4df7 BJ	274	addr->owc = -((sc->acc_olen + 1) >> 1);
28081cf8	275	cmd = ACC_IE \| OUT_ENLB \| ((info & 0x30000) >> 12) \| ACC_GO;
a2cd4df7 BJ	276	#ifdef LOOPBACK
	277	cmd \|= OUT_BBACK;
	278	#endif
	279	addr->ocsr = cmd;
28081cf8 SL	280	sc->acc_ic->ic_oactive = 1;
	281	}
	282
	283	/*
	284	* Output interrupt handler.
	285	*/
	286	accxint(unit)
	287	{
28081cf8 SL	288	register struct acc_softc *sc = &acc_softc[unit];
	289	register struct accdevice *addr;
	290
	291	COUNT(ACCXINT);
7dfb87a5 SL	292	acctrace("xint", sc->acc_ic->ic_oactive);
7dfb87a5 SL	293	addr = (struct accdevice *)accinfo[unit]->ui_addr;
28081cf8	294	if (sc->acc_ic->ic_oactive == 0) {
7dfb87a5 SL	295	printf("acc%d: stray xmit interrupt, csr=%b\n", unit,
	296	addr->ocsr, ACC_OUTBITS);
	297	addr->ocsr = ACC_RESET;
28081cf8 SL	298	return;
28081cf8 SL	299	}
7dfb87a5	300	acctrace("ocsr", addr->ocsr);
28081cf8 SL	301	sc->acc_if->if_opackets++;
28081cf8 SL	302	sc->acc_ic->ic_oactive = 0;
7dfb87a5 SL	303	if (addr->ocsr & (ACC_ERR\|OUT_TMR)) {
	304	printf("acc%d: output error, ocsr=%b, icsr=%b\n", unit,
	305	addr->ocsr, ACC_OUTBITS, addr->icsr, ACC_INBITS);
28081cf8	306	sc->acc_if->if_oerrors++;
a0b7c7fb	307	}
a2cd4df7 BJ	308	if (sc->acc_ifuba.ifu_xtofree) {
	309	m_freem(sc->acc_ifuba.ifu_xtofree);
	310	sc->acc_ifuba.ifu_xtofree = 0;
28081cf8	311	}
41e530c7 BJ	312	if (sc->acc_if->if_snd.ifq_head)
41e530c7 BJ	313	accstart(unit);
28081cf8 SL	314	}
	315
	316	/*
	317	* Input interrupt handler
	318	*/
	319	accrint(unit)
	320	{
	321	register struct acc_softc *sc = &acc_softc[unit];
	322	register struct accdevice *addr;
28081cf8 SL	323	struct mbuf *m;
	324	int len, info;
	325
	326	COUNT(ACCRINT);
7dfb87a5 SL	327	addr = (struct accdevice *)accinfo[unit]->ui_addr;
	328	if ((addr->icsr & ACC_RDY) == 0) {
	329	printf("acc%d: stray input interrupt\n", unit);
	330	accinputreset(addr, unit);
	331	goto setup;
	332	}
28081cf8 SL	333	sc->acc_if->if_ipackets++;
	334
	335	/*
	336	* Purge BDP; flush message if error indicated.
	337	*/
a2cd4df7 BJ	338	if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
a2cd4df7 BJ	339	UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp);
7dfb87a5 SL	340	acctrace("rint", addr->icsr);
	341	if (addr->icsr & (ACC_ERR\|IN_RMR)) {
	342	printf("acc%d: input error, icsr=%b, ocsr=%b\n", unit,
	343	addr->icsr, ACC_INBITS, addr->ocsr, ACC_OUTBITS);
28081cf8	344	sc->acc_if->if_ierrors++;
7dfb87a5 SL	345	if (addr->icsr & IN_RMR)
7dfb87a5 SL	346	accinputreset(addr, unit);
28081cf8 SL	347	sc->acc_flush = 1;
	348	}
	349
7dfb87a5	350	acctrace("flush", sc->acc_flush);
28081cf8	351	if (sc->acc_flush) {
a2cd4df7	352	if (addr->icsr & IN_EOM)
28081cf8 SL	353	sc->acc_flush = 0;
	354	goto setup;
	355	}
e431883e	356	len = IMPMTU + (addr->iwc << 1);
7dfb87a5	357	acctrace("length", len);
e431883e	358	if (len < 0 \|\| len > IMPMTU) {
a2cd4df7 BJ	359	printf("acc%d: bad length=%d\n", len);
	360	sc->acc_if->if_ierrors++;
	361	goto setup;
	362	}
28081cf8 SL	363
	364	/*
	365	* The last parameter is always 0 since using
	366	* trailers on the ARPAnet is insane.
	367	*/
	368	m = if_rubaget(&sc->acc_ifuba, len, 0);
	369	if (m == 0)
	370	goto setup;
a2cd4df7	371	if ((addr->icsr & IN_EOM) == 0) {
a0b7c7fb	372	if (sc->acc_iq)
28081cf8	373	m_cat(sc->acc_iq, m);
a0b7c7fb	374	else
28081cf8	375	sc->acc_iq = m;
28081cf8 SL	376	goto setup;
28081cf8 SL	377	}
a0b7c7fb	378	if (sc->acc_iq) {
28081cf8 SL	379	m_cat(sc->acc_iq, m);
	380	m = sc->acc_iq;
	381	sc->acc_iq = 0;
28081cf8	382	}
7dfb87a5	383	acctrace("impinput", 0);
28081cf8 SL	384	impinput(unit, m);
	385
	386	setup:
	387	/*
	388	* Setup for next message.
	389	*/
	390	info = sc->acc_ifuba.ifu_r.ifrw_info;
a2cd4df7	391	addr->iba = (u_short)info;
e431883e	392	addr->iwc = -(IMPMTU >> 1);
a2cd4df7	393	addr->icsr =
28081cf8 SL	394	IN_MRDY \| ACC_IE \| IN_WEN \| ((info & 0x30000) >> 12) \| ACC_GO;
28081cf8 SL	395	}
7dfb87a5 SL	396
	397	int accprintf = 0;
	398
	399	acctrace(cmd, value)
	400	char *cmd;
	401	int value;
	402	{
	403	register int i;
	404	register char p = (char )&value;
	405
	406	if (accprintf)
	407	printf("%s: %x", cmd, value);
	408	do {
	409	if (accdebugx >= NACCDEBUG)
	410	accdebugx = 0;
	411	accdebug[accdebugx++] = *cmd;
	412	} while (*cmd++);
	413	for (i = 0; i < sizeof (int); i++) {
	414	if (accdebugx >= NACCDEBUG)
	415	accdebugx = 0;
	416	accdebug[accdebugx++] = *p++;
	417	}
	418	}
28081cf8	419	#endif