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[unix-history] / usr / src / sys / vax / uba / ts.c
/* ts.c 4.35 82/10/20 */
#include "ts.h"
#if NTS > 0
/*
* TS11 tape driver
*
* TODO:
* write dump code
*/
#include "../h/param.h"
#include "../h/systm.h"
#include "../h/buf.h"
#include "../h/dir.h"
#include "../h/conf.h"
#include "../h/user.h"
#include "../h/file.h"
#include "../h/map.h"
#include "../h/pte.h"
#include "../h/vm.h"
#include "../h/ioctl.h"
#include "../h/mtio.h"
#include "../h/cmap.h"
#include "../h/uio.h"
#include "../vax/cpu.h"
#include "../vaxuba/ubareg.h"
#include "../vaxuba/ubavar.h"
#include "../vaxuba/tsreg.h"
/*
* There is a ctsbuf per tape controller.
* It is used as the token to pass to the internal routines
* to execute tape ioctls.
* In particular, when the tape is rewinding on close we release
* the user process but any further attempts to use the tape drive
* before the rewind completes will hang waiting for ctsbuf.
*/
struct buf ctsbuf[NTS];
/*
* Raw tape operations use rtsbuf. The driver
* notices when rtsbuf is being used and allows the user
* program to continue after errors and read records
* not of the standard length (BSIZE).
*/
struct buf rtsbuf[NTS];
/*
* Driver unibus interface routines and variables.
*/
int tsprobe(), tsslave(), tsattach(), tsdgo(), tsintr();
struct uba_ctlr *tsminfo[NTS];
struct uba_device *tsdinfo[NTS];
struct buf tsutab[NTS];
u_short tsstd[] = { 0772520, 0 };
/*** PROBABLY DON'T NEED ALL THESE SINCE CONTROLLER == DRIVE ***/
struct uba_driver zsdriver =
{ tsprobe, tsslave, tsattach, tsdgo, tsstd, "ts", tsdinfo, "zs", tsminfo, 0 };
/* bits in minor device */
#define TSUNIT(dev) (minor(dev)&03)
#define T_NOREWIND 04
#define INF (daddr_t)1000000L
/*
* Software state per tape transport.
* Also contains hardware state in message packets.
*
* 1. A tape drive is a unique-open device; we refuse opens when it is already.
* 2. We keep track of the current position on a block tape and seek
* before operations by forward/back spacing if necessary.
* 3. We remember if the last operation was a write on a tape, so if a tape
* is open read write and the last thing done is a write we can
* write a standard end of tape mark (two eofs).
* 4. We remember the status registers after the last command, using
* then internally and returning them to the SENSE ioctl.
*/
struct ts_softc {
char sc_openf; /* lock against multiple opens */
char sc_lastiow; /* last op was a write */
short sc_resid; /* copy of last bc */
daddr_t sc_blkno; /* block number, for block device tape */
daddr_t sc_nxrec; /* position of end of tape, if known */
struct ts_cmd sc_cmd; /* the command packet */
struct ts_sts sc_sts; /* status packet, for returned status */
struct ts_char sc_char; /* characteristics packet */
struct ts_softc *sc_ubaddr; /* Unibus address of ts_softc structure */
u_short sc_uba; /* Unibus addr of cmd pkt for tsdb */
short sc_mapped; /* is ts_sfotc mapped in Unibus space? */
} ts_softc[NTS];
/*
* States for um->um_tab.b_active, the per controller state flag.
* This is used to sequence control in the driver.
*/
#define SSEEK 1 /* seeking */
#define SIO 2 /* doing seq i/o */
#define SCOM 3 /* sending control command */
#define SREW 4 /* sending a drive rewind */
/*
* Determine if there is a controller for
* a ts at address reg. Our goal is to make the
* device interrupt.
*/
/*ARGSUSED*/
tsprobe(reg)
caddr_t reg;
{
register int br, cvec; /* must be r11,r10; value-result */
#ifdef lint
br = 0; cvec = br; br = cvec;
tsintr(0);
#endif
((struct tsdevice *)reg)->tssr = 0;
DELAY(100);
if ((((struct tsdevice *)reg)->tssr & TS_NBA) == 0)
return(0);
/* IT'S TOO HARD TO MAKE THIS THING INTERRUPT JUST TO FIND ITS VECTOR */
cvec = ((unsigned)reg) & 07 ? 0260 : 0224;
br = 0x15;
return (sizeof (struct tsdevice));
}
/*
* TS11 only supports one drive per controller;
* check for ui_slave == 0.
*
* DO WE REALLY NEED THIS ROUTINE???
*/
/*ARGSUSED*/
tsslave(ui, reg)
struct uba_device *ui;
caddr_t reg;
{
if (ui->ui_slave) /* non-zero slave not allowed */
return(0);
return (1);
}
/*
* Record attachment of the unit to the controller.
*
* SHOULD THIS ROUTINE DO ANYTHING???
*/
/*ARGSUSED*/
tsattach(ui)
struct uba_device *ui;
{
}
/*
* Open the device. Tapes are unique open
* devices, so we refuse if it is already open.
* We also check that a tape is available, and
* don't block waiting here; if you want to wait
* for a tape you should timeout in user code.
*/
tsopen(dev, flag)
dev_t dev;
int flag;
{
register int tsunit;
register struct uba_device *ui;
register struct ts_softc *sc;
tsunit = TSUNIT(dev);
if (tsunit>=NTS || (sc = &ts_softc[tsunit])->sc_openf ||
(ui = tsdinfo[tsunit]) == 0 || ui->ui_alive == 0)
return (ENXIO);
if (tsinit(tsunit))
return (ENXIO);
tscommand(dev, TS_SENSE, 1);
if ((sc->sc_sts.s_xs0&TS_ONL) == 0) {
uprintf("ts%d: not online\n", tsunit);
return (EIO);
}
if ((flag&(FREAD|FWRITE)) == FWRITE && (sc->sc_sts.s_xs0&TS_WLK)) {
uprintf("ts%d: no write ring\n", tsunit);
return (EIO);
}
sc->sc_openf = 1;
sc->sc_blkno = (daddr_t)0;
sc->sc_nxrec = INF;
sc->sc_lastiow = 0;
return (0);
}
/*
* Close tape device.
*
* If tape was open for writing or last operation was
* a write, then write two EOF's and backspace over the last one.
* Unless this is a non-rewinding special file, rewind the tape.
* Make the tape available to others.
*/
tsclose(dev, flag)
register dev_t dev;
register flag;
{
register struct ts_softc *sc = &ts_softc[TSUNIT(dev)];
if (flag == FWRITE || (flag&FWRITE) && sc->sc_lastiow) {
tscommand(dev, TS_WEOF, 1);
tscommand(dev, TS_WEOF, 1);
tscommand(dev, TS_SREV, 1);
}
if ((minor(dev)&T_NOREWIND) == 0)
/*
* 0 count means don't hang waiting for rewind complete
* rather ctsbuf stays busy until the operation completes
* preventing further opens from completing by
* preventing a TS_SENSE from completing.
*/
tscommand(dev, TS_REW, 0);
sc->sc_openf = 0;
}
/*
* Initialize the TS11. Set up Unibus mapping for command
* packets and set device characteristics.
*/
tsinit(unit)
register int unit;
{
register struct ts_softc *sc = &ts_softc[unit];
register struct uba_ctlr *um = tsminfo[unit];
register struct tsdevice *addr = (struct tsdevice *)um->um_addr;
register int i;
/*
* Map the command and message packets into Unibus
* address space. We do all the command and message
* packets at once to minimize the amount of Unibus
* mapping necessary.
*/
if (sc->sc_mapped == 0) {
ctsbuf[unit].b_un.b_addr = (caddr_t)sc;
ctsbuf[unit].b_bcount = sizeof(*sc);
i = ubasetup(um->um_ubanum, &ctsbuf[unit], 0);
i &= 0777777;
sc->sc_ubaddr = (struct ts_softc *)i;
sc->sc_mapped++;
}
/*
* Now initialize the TS11 controller.
* Set the characteristics.
*/
if (addr->tssr & (TS_NBA|TS_OFL)) {
addr->tssr = 0; /* subsystem initialize */
tswait(addr);
i = (int)&sc->sc_ubaddr->sc_cmd; /* Unibus addr of cmd */
sc->sc_uba = (u_short)(i + ((i>>16)&3));
sc->sc_char.char_addr = (int)&sc->sc_ubaddr->sc_sts;
sc->sc_char.char_size = sizeof(struct ts_sts);
sc->sc_char.char_mode = TS_ESS;
sc->sc_cmd.c_cmd = TS_ACK | TS_SETCHR;
i = (int)&sc->sc_ubaddr->sc_char;
sc->sc_cmd.c_loba = i;
sc->sc_cmd.c_hiba = (i>>16)&3;
sc->sc_cmd.c_size = sizeof(struct ts_char);
addr->tsdb = sc->sc_uba;
tswait(addr);
if (addr->tssr & TS_NBA)
return(1);
}
return(0);
}
/*
* Execute a command on the tape drive
* a specified number of times.
*/
tscommand(dev, com, count)
dev_t dev;
int com, count;
{
register struct buf *bp;
register int s;
bp = &ctsbuf[TSUNIT(dev)];
s = spl5();
while (bp->b_flags&B_BUSY) {
/*
* This special check is because B_BUSY never
* gets cleared in the non-waiting rewind case.
*/
if (bp->b_repcnt == 0 && (bp->b_flags&B_DONE))
break;
bp->b_flags |= B_WANTED;
sleep((caddr_t)bp, PRIBIO);
}
bp->b_flags = B_BUSY|B_READ;
splx(s);
bp->b_dev = dev;
bp->b_repcnt = count;
bp->b_command = com;
bp->b_blkno = 0;
tsstrategy(bp);
/*
* In case of rewind from close, don't wait.
* This is the only case where count can be 0.
*/
if (count == 0)
return;
iowait(bp);
if (bp->b_flags&B_WANTED)
wakeup((caddr_t)bp);
bp->b_flags &= B_ERROR;
}
/*
* Queue a tape operation.
*/
tsstrategy(bp)
register struct buf *bp;
{
int tsunit = TSUNIT(bp->b_dev);
register struct uba_ctlr *um;
register struct buf *dp;
register int s;
/*
* Put transfer at end of controller queue
*/
bp->av_forw = NULL;
um = tsdinfo[tsunit]->ui_mi;
s = spl5();
dp = &tsutab[tsunit];
if (dp->b_actf == NULL)
dp->b_actf = bp;
else
dp->b_actl->av_forw = bp;
dp->b_actl = bp;
um->um_tab.b_actf = um->um_tab.b_actl = dp;
/*
* If the controller is not busy, get
* it going.
*/
if (um->um_tab.b_active == 0)
tsstart(um);
splx(s);
}
/*
* Start activity on a ts controller.
*/
tsstart(um)
register struct uba_ctlr *um;
{
register struct buf *bp;
register struct tsdevice *addr = (struct tsdevice *)um->um_addr;
register struct ts_softc *sc;
register struct ts_cmd *tc;
register struct uba_device *ui;
int tsunit, cmd;
daddr_t blkno;
/*
* Start the controller if there is something for it to do.
*/
loop:
if ((bp = um->um_tab.b_actf->b_actf) == NULL)
return;
tsunit = TSUNIT(bp->b_dev);
ui = tsdinfo[tsunit];
sc = &ts_softc[tsunit];
tc = &sc->sc_cmd;
/*
* Default is that last command was NOT a write command;
* if we do a write command we will notice this in tsintr().
*/
sc->sc_lastiow = 0;
if (sc->sc_openf < 0 || (addr->tssr&TS_OFL)) {
/*
* Have had a hard error on a non-raw tape
* or the tape unit is now unavailable
* (e.g. taken off line).
*/
bp->b_flags |= B_ERROR;
goto next;
}
if (bp == &ctsbuf[TSUNIT(bp->b_dev)]) {
/*
* Execute control operation with the specified count.
*/
um->um_tab.b_active =
bp->b_command == TS_REW ? SREW : SCOM;
tc->c_repcnt = bp->b_repcnt;
goto dobpcmd;
}
/*
* The following checks handle boundary cases for operation
* on non-raw tapes. On raw tapes the initialization of
* sc->sc_nxrec by tsphys causes them to be skipped normally
* (except in the case of retries).
*/
if (bdbtofsb(bp->b_blkno) > sc->sc_nxrec) {
/*
* Can't read past known end-of-file.
*/
bp->b_flags |= B_ERROR;
bp->b_error = ENXIO;
goto next;
}
if (bdbtofsb(bp->b_blkno) == sc->sc_nxrec &&
bp->b_flags&B_READ) {
/*
* Reading at end of file returns 0 bytes.
*/
bp->b_resid = bp->b_bcount;
clrbuf(bp);
goto next;
}
if ((bp->b_flags&B_READ) == 0)
/*
* Writing sets EOF
*/
sc->sc_nxrec = bdbtofsb(bp->b_blkno) + 1;
/*
* If the data transfer command is in the correct place,
* set up all the registers except the csr, and give
* control over to the UNIBUS adapter routines, to
* wait for resources to start the i/o.
*/
if ((blkno = sc->sc_blkno) == bdbtofsb(bp->b_blkno)) {
tc->c_size = bp->b_bcount;
if ((bp->b_flags&B_READ) == 0)
cmd = TS_WCOM;
else
cmd = TS_RCOM;
if (um->um_tab.b_errcnt)
cmd |= TS_RETRY;
um->um_tab.b_active = SIO;
tc->c_cmd = TS_ACK | TS_CVC | TS_IE | cmd;
(void) ubago(ui);
return;
}
/*
* Tape positioned incorrectly;
* set to seek forwards or backwards to the correct spot.
* This happens for raw tapes only on error retries.
*/
um->um_tab.b_active = SSEEK;
if (blkno < bdbtofsb(bp->b_blkno)) {
bp->b_command = TS_SFORW;
tc->c_repcnt = bdbtofsb(bp->b_blkno) - blkno;
} else {
bp->b_command = TS_SREV;
tc->c_repcnt = blkno - bdbtofsb(bp->b_blkno);
}
dobpcmd:
/*
* Do the command in bp.
*/
tc->c_cmd = TS_ACK | TS_CVC | TS_IE | bp->b_command;
addr->tsdb = sc->sc_uba;
return;
next:
/*
* Done with this operation due to error or
* the fact that it doesn't do anything.
* Release UBA resources (if any), dequeue
* the transfer and continue processing this slave.
*/
if (um->um_ubinfo)
ubadone(um);
um->um_tab.b_errcnt = 0;
um->um_tab.b_actf->b_actf = bp->av_forw;
iodone(bp);
goto loop;
}
/*
* The UNIBUS resources we needed have been
* allocated to us; start the device.
*/
tsdgo(um)
register struct uba_ctlr *um;
{
register struct tsdevice *addr = (struct tsdevice *)um->um_addr;
register struct ts_softc *sc = &ts_softc[um->um_ctlr];
register int i;
i = um->um_ubinfo & 0777777;
sc->sc_cmd.c_loba = i;
sc->sc_cmd.c_hiba = (i>>16)&3;
addr->tsdb = sc->sc_uba;
}
/*
* Ts interrupt routine.
*/
/*ARGSUSED*/
tsintr(ts11)
int ts11;
{
register struct buf *bp;
register struct uba_ctlr *um = tsminfo[ts11];
register struct tsdevice *addr;
register struct ts_softc *sc;
int tsunit;
register state;
if ((bp = um->um_tab.b_actf->b_actf) == NULL)
return;
tsunit = TSUNIT(bp->b_dev);
addr = (struct tsdevice *)tsdinfo[tsunit]->ui_addr;
/*
* If last command was a rewind, and tape is still
* rewinding, wait for the rewind complete interrupt.
*
* SHOULD NEVER GET AN INTERRUPT IN THIS STATE.
*/
if (um->um_tab.b_active == SREW) {
um->um_tab.b_active = SCOM;
if ((addr->tssr&TS_SSR) == 0)
return;
}
/*
* An operation completed... record status
*/
sc = &ts_softc[tsunit];
if ((bp->b_flags & B_READ) == 0)
sc->sc_lastiow = 1;
state = um->um_tab.b_active;
um->um_tab.b_active = 0;
/*
* Check for errors.
*/
if (addr->tssr&TS_SC) {
switch (addr->tssr & TS_TC) {
case TS_UNREC: /* unrecoverable */
case TS_FATAL: /* fatal error */
case TS_ATTN: /* attention (shouldn't happen) */
case TS_RECNM: /* recoverable, no motion */
break;
case TS_SUCC: /* success termination */
printf("ts%d: success\n", TSUNIT(minor(bp->b_dev)));
goto ignoreerr;
case TS_ALERT: /* tape status alert */
/*
* If we hit the end of the tape file,
* update our position.
*/
if (sc->sc_sts.s_xs0 & (TS_TMK|TS_EOT)) {
tsseteof(bp); /* set blkno and nxrec */
state = SCOM; /* force completion */
/*
* Stuff bc so it will be unstuffed correctly
* later to get resid.
*/
sc->sc_sts.s_rbpcr = bp->b_bcount;
goto opdone;
}
/*
* If we were reading raw tape and the record was too long
* or too short, then we don't consider this an error.
*/
if (bp == &rtsbuf[TSUNIT(bp->b_dev)] && (bp->b_flags&B_READ) &&
sc->sc_sts.s_xs0&(TS_RLS|TS_RLL))
goto ignoreerr;
case TS_RECOV: /* recoverable, tape moved */
/*
* If this was an i/o operation retry up to 8 times.
*/
if (state==SIO) {
if (++um->um_tab.b_errcnt < 7) {
ubadone(um);
goto opcont;
} else
sc->sc_blkno++;
} else {
/*
* Non-i/o errors on non-raw tape
* cause it to close.
*/
if (sc->sc_openf>0 && bp != &rtsbuf[TSUNIT(bp->b_dev)])
sc->sc_openf = -1;
}
break;
case TS_REJECT: /* function reject */
if (state == SIO && sc->sc_sts.s_xs0 & TS_WLE)
printf("ts%d: write locked\n", TSUNIT(bp->b_dev));
if ((sc->sc_sts.s_xs0 & TS_ONL) == 0)
printf("ts%d: offline\n", TSUNIT(bp->b_dev));
break;
}
/*
* Couldn't recover error
*/
printf("ts%d: hard error bn%d xs0=%b", TSUNIT(bp->b_dev),
bp->b_blkno, sc->sc_sts.s_xs0, TSXS0_BITS);
if (sc->sc_sts.s_xs1)
printf(" xs1=%b", sc->sc_sts.s_xs1, TSXS1_BITS);
if (sc->sc_sts.s_xs2)
printf(" xs2=%b", sc->sc_sts.s_xs2, TSXS2_BITS);
if (sc->sc_sts.s_xs3)
printf(" xs3=%b", sc->sc_sts.s_xs3, TSXS3_BITS);
printf("\n");
bp->b_flags |= B_ERROR;
goto opdone;
}
/*
* Advance tape control FSM.
*/
ignoreerr:
switch (state) {
case SIO:
/*
* Read/write increments tape block number
*/
sc->sc_blkno++;
goto opdone;
case SCOM:
/*
* For forward/backward space record update current position.
*/
if (bp == &ctsbuf[TSUNIT(bp->b_dev)])
switch (bp->b_command) {
case TS_SFORW:
sc->sc_blkno += bp->b_repcnt;
break;
case TS_SREV:
sc->sc_blkno -= bp->b_repcnt;
break;
}
goto opdone;
case SSEEK:
sc->sc_blkno = bdbtofsb(bp->b_blkno);
goto opcont;
default:
panic("tsintr");
}
opdone:
/*
* Reset error count and remove
* from device queue.
*/
um->um_tab.b_errcnt = 0;
um->um_tab.b_actf->b_actf = bp->av_forw;
bp->b_resid = sc->sc_sts.s_rbpcr;
ubadone(um);
iodone(bp);
if (um->um_tab.b_actf->b_actf == 0)
return;
opcont:
tsstart(um);
}
tsseteof(bp)
register struct buf *bp;
{
register int tsunit = TSUNIT(bp->b_dev);
register struct ts_softc *sc = &ts_softc[tsunit];
if (bp == &ctsbuf[TSUNIT(bp->b_dev)]) {
if (sc->sc_blkno > bdbtofsb(bp->b_blkno)) {
/* reversing */
sc->sc_nxrec = bdbtofsb(bp->b_blkno) - sc->sc_sts.s_rbpcr;
sc->sc_blkno = sc->sc_nxrec;
} else {
/* spacing forward */
sc->sc_blkno = bdbtofsb(bp->b_blkno) + sc->sc_sts.s_rbpcr;
sc->sc_nxrec = sc->sc_blkno - 1;
}
return;
}
/* eof on read */
sc->sc_nxrec = bdbtofsb(bp->b_blkno);
}
tsread(dev, uio)
dev_t dev;
struct uio *uio;
{
int errno;
errno = tsphys(dev, uio);
if (errno)
return (errno);
return (physio(tsstrategy, &rtsbuf[TSUNIT(dev)], dev, B_READ, minphys, uio));
}
tswrite(dev, uio)
dev_t dev;
struct uio *uio;
{
int errno;
errno = tsphys(dev, uio);
if (errno)
return (errno);
return (physio(tsstrategy, &rtsbuf[TSUNIT(dev)], dev, B_WRITE, minphys, uio));
}
/*
* Check that a raw device exists.
* If it does, set up sc_blkno and sc_nxrec
* so that the tape will appear positioned correctly.
*/
tsphys(dev, uio)
dev_t dev;
struct uio *uio;
{
register int tsunit = TSUNIT(dev);
register daddr_t a;
register struct ts_softc *sc;
register struct uba_device *ui;
if (tsunit >= NTS || (ui=tsdinfo[tsunit]) == 0 || ui->ui_alive == 0)
return (ENXIO);
sc = &ts_softc[tsunit];
a = bdbtofsb(uio->uio_offset >> 9);
sc->sc_blkno = a;
sc->sc_nxrec = a + 1;
return (0);
}
tsreset(uban)
int uban;
{
register struct uba_ctlr *um;
register struct uba_device *ui;
register struct buf *dp;
register ts11;
for (ts11 = 0; ts11 < NTS; ts11++) {
if ((um = tsminfo[ts11]) == 0 || um->um_alive == 0 ||
um->um_ubanum != uban)
continue;
printf(" ts%d", ts11);
um->um_tab.b_active = 0;
um->um_tab.b_actf = um->um_tab.b_actl = 0;
if (ts_softc[ts11].sc_openf > 0)
ts_softc[ts11].sc_openf = -1;
if (um->um_ubinfo) {
printf("<%d>", (um->um_ubinfo>>28)&0xf);
ubadone(um);
}
if ((ui = tsdinfo[ts11]) && ui->ui_mi == um && ui->ui_alive) {
dp = &tsutab[ts11];
dp->b_active = 0;
dp->b_forw = 0;
if (um->um_tab.b_actf == NULL)
um->um_tab.b_actf = dp;
else
um->um_tab.b_actl->b_forw = dp;
um->um_tab.b_actl = dp;
}
(void) tsinit(ts11);
tsstart(um);
}
}
/*ARGSUSED*/
tsioctl(dev, cmd, data, flag)
caddr_t data;
dev_t dev;
{
int tsunit = TSUNIT(dev);
register struct ts_softc *sc = &ts_softc[tsunit];
register struct buf *bp = &ctsbuf[TSUNIT(dev)];
register callcount;
int fcount;
struct mtop *mtop;
struct mtget *mtget;
/* we depend of the values and order of the MT codes here */
static tsops[] =
{TS_WEOF,TS_SFORWF,TS_SREVF,TS_SFORW,TS_SREV,TS_REW,TS_OFFL,TS_SENSE};
switch (cmd) {
case MTIOCTOP: /* tape operation */
mtop = (struct mtop *)data;
switch (mtop->mt_op) {
case MTWEOF:
callcount = mtop->mt_count;
fcount = 1;
break;
case MTFSF: case MTBSF:
case MTFSR: case MTBSR:
callcount = 1;
fcount = mtop->mt_count;
break;
case MTREW: case MTOFFL: case MTNOP:
callcount = 1;
fcount = 1;
break;
default:
return (ENXIO);
}
if (callcount <= 0 || fcount <= 0)
return (EINVAL);
while (--callcount >= 0) {
tscommand(dev, tsops[mtop->mt_op], fcount);
if ((mtop->mt_op == MTFSR || mtop->mt_op == MTBSR) &&
bp->b_resid)
return (EIO);
if ((bp->b_flags&B_ERROR) || sc->sc_sts.s_xs0&TS_BOT)
break;
}
return (geterror(bp));
case MTIOCGET:
mtget = (struct mtget *)data;
mtget->mt_dsreg = 0;
mtget->mt_erreg = sc->sc_sts.s_xs0;
mtget->mt_resid = sc->sc_resid;
mtget->mt_type = MT_ISTS;
break;
default:
return (ENXIO);
}
return (0);
}
#define DBSIZE 20
tsdump()
{
register struct uba_device *ui;
register struct uba_regs *up;
register struct tsdevice *addr;
int blk, num;
int start;
start = 0;
num = maxfree;
#define phys(a,b) ((b)((int)(a)&0x7fffffff))
if (tsdinfo[0] == 0)
return (ENXIO);
ui = phys(tsdinfo[0], struct uba_device *);
up = phys(ui->ui_hd, struct uba_hd *)->uh_physuba;
ubainit(up);
DELAY(1000000);
addr = (struct tsdevice *)ui->ui_physaddr;
addr->tssr = 0;
tswait(addr);
while (num > 0) {
blk = num > DBSIZE ? DBSIZE : num;
tsdwrite(start, blk, addr, up);
start += blk;
num -= blk;
}
tseof(addr);
tseof(addr);
tswait(addr);
if (addr->tssr&TS_SC)
return (EIO);
addr->tssr = 0;
tswait(addr);
return (0);
}
tsdwrite(dbuf, num, addr, up)
register int dbuf, num;
register struct tsdevice *addr;
struct uba_regs *up;
{
register struct pte *io;
register int npf;
tswait(addr);
io = up->uba_map;
npf = num+1;
while (--npf != 0)
*(int *)io++ = (dbuf++ | (1<<UBAMR_DPSHIFT) | UBAMR_MRV);
*(int *)io = 0;
#ifdef notyet
addr->tsbc = -(num*NBPG);
addr->tsba = 0;
addr->tscs = TS_WCOM | TM_GO;
#endif
}
tswait(addr)
register struct tsdevice *addr;
{
register s;
do
s = addr->tssr;
while ((s & TS_SSR) == 0);
}
tseof(addr)
struct tsdevice *addr;
{
tswait(addr);
#ifdef notyet
addr->tscs = TS_WEOF | TM_GO;
#endif
}
#endif
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.