4.1cBSD/a/sys/vaxuba/tm.c
/* tm.c 4.60 82/12/17 */
#include "te.h"
#include "ts.h"
#if NTE > 0
/*
* TM11/TE10 tape driver
*
* TODO:
* test driver with more than one slave
* test driver with more than one controller
* test reset code
* what happens if you offline tape during rewind?
* test using file system on tape
*/
#include "../machine/pte.h"
#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/vm.h"
#include "../h/ioctl.h"
#include "../h/mtio.h"
#include "../h/cmap.h"
#include "../h/uio.h"
#include "../h/kernel.h"
#include "../vax/cpu.h"
#include "../vaxuba/ubareg.h"
#include "../vaxuba/ubavar.h"
#include "../vaxuba/tmreg.h"
/*
* There is a ctmbuf per tape controller.
* It is used as the token to pass to the internal routines
* to execute tape ioctls, and also acts as a lock on the slaves
* on the controller, since there is only one per controller.
* 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 ctmbuf.
*/
struct buf ctmbuf[NTM];
/*
* Raw tape operations use rtmbuf. The driver
* notices when rtmbuf is being used and allows the user
* program to continue after errors and read records
* not of the standard length (BSIZE).
*/
struct buf rtmbuf[NTM];
/*
* Driver unibus interface routines and variables.
*/
int tmprobe(), tmslave(), tmattach(), tmdgo(), tmintr();
struct uba_ctlr *tmminfo[NTM];
struct uba_device *tedinfo[NTE];
struct buf teutab[NTE];
short tetotm[NTE];
u_short tmstd[] = { 0772520, 0 };
struct uba_driver tmdriver =
{ tmprobe, tmslave, tmattach, tmdgo, tmstd, "te", tedinfo, "tm", tmminfo, 0 };
/* bits in minor device */
#define TEUNIT(dev) (minor(dev)&03)
#define TMUNIT(dev) (tetotm[TEUNIT(dev)])
#define T_NOREWIND 04
#define T_1600BPI 08
#define INF (daddr_t)1000000L
/*
* Software state per tape transport.
*
* 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.
* 5. We remember the last density the tape was used at. If it is
* not a BOT when we start using it and we are writing, we don't
* let the density be changed.
*/
struct te_softc {
char sc_openf; /* lock against multiple opens */
char sc_lastiow; /* last op was a write */
daddr_t sc_blkno; /* block number, for block device tape */
daddr_t sc_nxrec; /* position of end of tape, if known */
u_short sc_erreg; /* copy of last erreg */
u_short sc_dsreg; /* copy of last dsreg */
short sc_resid; /* copy of last bc */
#ifdef unneeded
short sc_lastcmd; /* last command to handle direction changes */
#endif
u_short sc_dens; /* prototype command with density info */
daddr_t sc_timo; /* time until timeout expires */
short sc_tact; /* timeout is active */
} te_softc[NTE];
#ifdef unneeded
int tmgapsdcnt; /* DEBUG */
#endif
/*
* 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 tm at address reg. Our goal is to make the
* device interrupt.
*/
tmprobe(reg)
caddr_t reg;
{
register int br, cvec; /* must be r11,r10; value-result */
#ifdef lint
br = 0; cvec = br; br = cvec;
tmintr(0);
#endif
((struct tmdevice *)reg)->tmcs = TM_IE;
/*
* If this is a tm11, it ought to have interrupted
* by now, if it isn't (ie: it is a ts04) then we just
* hope that it didn't interrupt, so autoconf will ignore it.
* Just in case, we will reference one
* of the more distant registers, and hope for a machine
* check, or similar disaster if this is a ts.
*
* Note: on an 11/780, badaddr will just generate
* a uba error for a ts; but our caller will notice that
* so we won't check for it.
*/
if (badaddr((caddr_t)&((struct tmdevice *)reg)->tmrd, 2))
return (0);
return (sizeof (struct tmdevice));
}
/*
* Due to a design flaw, we cannot ascertain if the tape
* exists or not unless it is on line - ie: unless a tape is
* mounted. This is too servere a restriction to bear,
* so all units are assumed to exist.
*/
/*ARGSUSED*/
tmslave(ui, reg)
struct uba_device *ui;
caddr_t reg;
{
return (1);
}
/*
* Record attachment of the unit to the controller.
*/
/*ARGSUSED*/
tmattach(ui)
struct uba_device *ui;
{
/*
* Tetotm is used in TMUNIT to index the ctmbuf and rtmbuf
* arrays given a te unit number.
*/
tetotm[ui->ui_unit] = ui->ui_mi->um_ctlr;
}
int tmtimer();
/*
* 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.
*/
tmopen(dev, flag)
dev_t dev;
int flag;
{
register int teunit;
register struct uba_device *ui;
register struct te_softc *sc;
int olddens, dens;
int s;
teunit = TEUNIT(dev);
if (teunit>=NTE || (sc = &te_softc[teunit])->sc_openf ||
(ui = tedinfo[teunit]) == 0 || ui->ui_alive == 0)
return (ENXIO);
olddens = sc->sc_dens;
dens = TM_IE | TM_GO | (ui->ui_slave << 8);
if ((minor(dev) & T_1600BPI) == 0)
dens |= TM_D800;
sc->sc_dens = dens;
get:
tmcommand(dev, TM_SENSE, 1);
if (sc->sc_erreg&TMER_SDWN) {
sleep((caddr_t)&lbolt, PZERO+1);
goto get;
}
sc->sc_dens = olddens;
if ((sc->sc_erreg&(TMER_SELR|TMER_TUR)) != (TMER_SELR|TMER_TUR)) {
uprintf("te%d: not online\n", teunit);
return (EIO);
}
if ((flag&FWRITE) && (sc->sc_erreg&TMER_WRL)) {
uprintf("te%d: no write ring\n", teunit);
return (EIO);
}
if ((sc->sc_erreg&TMER_BOT) == 0 && (flag&FWRITE) &&
dens != sc->sc_dens) {
uprintf("te%d: can't change density in mid-tape\n", teunit);
return (EIO);
}
sc->sc_openf = 1;
sc->sc_blkno = (daddr_t)0;
sc->sc_nxrec = INF;
sc->sc_lastiow = 0;
sc->sc_dens = dens;
s = spl6();
if (sc->sc_tact == 0) {
sc->sc_timo = INF;
sc->sc_tact = 1;
timeout(tmtimer, (caddr_t)dev, 5*hz);
}
splx(s);
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.
*/
tmclose(dev, flag)
register dev_t dev;
register flag;
{
register struct te_softc *sc = &te_softc[TEUNIT(dev)];
if (flag == FWRITE || (flag&FWRITE) && sc->sc_lastiow) {
tmcommand(dev, TM_WEOF, 1);
tmcommand(dev, TM_WEOF, 1);
tmcommand(dev, TM_SREV, 1);
}
if ((minor(dev)&T_NOREWIND) == 0)
/*
* 0 count means don't hang waiting for rewind complete
* rather ctmbuf stays busy until the operation completes
* preventing further opens from completing by
* preventing a TM_SENSE from completing.
*/
tmcommand(dev, TM_REW, 0);
sc->sc_openf = 0;
}
/*
* Execute a command on the tape drive
* a specified number of times.
*/
tmcommand(dev, com, count)
dev_t dev;
int com, count;
{
register struct buf *bp;
register int s;
bp = &ctmbuf[TMUNIT(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;
tmstrategy(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.
*/
tmstrategy(bp)
register struct buf *bp;
{
int teunit = TEUNIT(bp->b_dev);
register struct uba_ctlr *um;
register struct buf *dp;
int s;
/*
* Put transfer at end of unit queue
*/
dp = &teutab[teunit];
bp->av_forw = NULL;
s = spl5();
um = tedinfo[teunit]->ui_mi;
if (dp->b_actf == NULL) {
dp->b_actf = bp;
/*
* Transport not already active...
* put at end of controller queue.
*/
dp->b_forw = NULL;
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;
} else
dp->b_actl->av_forw = bp;
dp->b_actl = bp;
/*
* If the controller is not busy, get
* it going.
*/
if (um->um_tab.b_active == 0)
tmstart(um);
splx(s);
}
/*
* Start activity on a tm controller.
*/
tmstart(um)
register struct uba_ctlr *um;
{
register struct buf *bp, *dp;
register struct tmdevice *addr = (struct tmdevice *)um->um_addr;
register struct te_softc *sc;
register struct uba_device *ui;
int teunit, cmd;
daddr_t blkno;
/*
* Look for an idle transport on the controller.
*/
loop:
if ((dp = um->um_tab.b_actf) == NULL)
return;
if ((bp = dp->b_actf) == NULL) {
um->um_tab.b_actf = dp->b_forw;
goto loop;
}
teunit = TEUNIT(bp->b_dev);
ui = tedinfo[teunit];
/*
* Record pre-transfer status (e.g. for TM_SENSE)
*/
sc = &te_softc[teunit];
addr = (struct tmdevice *)um->um_addr;
addr->tmcs = (ui->ui_slave << 8);
sc->sc_dsreg = addr->tmcs;
sc->sc_erreg = addr->tmer;
sc->sc_resid = addr->tmbc;
/*
* Default is that last command was NOT a write command;
* if we do a write command we will notice this in tmintr().
*/
sc->sc_lastiow = 0;
if (sc->sc_openf < 0 || (addr->tmcs&TM_CUR) == 0) {
/*
* 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 == &ctmbuf[TMUNIT(bp->b_dev)]) {
/*
* Execute control operation with the specified count.
*/
if (bp->b_command == TM_SENSE)
goto next;
/*
* Set next state; give 5 minutes to complete
* rewind, or 10 seconds per iteration (minimum 60
* seconds and max 5 minutes) to complete other ops.
*/
if (bp->b_command == TM_REW) {
um->um_tab.b_active = SREW;
sc->sc_timo = 5 * 60;
} else {
um->um_tab.b_active = SCOM;
sc->sc_timo =
imin(imax(10*(int)-bp->b_repcnt,60),5*60);
}
if (bp->b_command == TM_SFORW || bp->b_command == TM_SREV)
addr->tmbc = 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 tmphys 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)) {
addr->tmbc = -bp->b_bcount;
if ((bp->b_flags&B_READ) == 0) {
if (um->um_tab.b_errcnt)
cmd = TM_WIRG;
else
cmd = TM_WCOM;
} else
cmd = TM_RCOM;
um->um_tab.b_active = SIO;
um->um_cmd = sc->sc_dens|cmd;
#ifdef notdef
if (tmreverseop(sc->sc_lastcmd))
while (addr->tmer & TMER_SDWN)
tmgapsdcnt++;
sc->sc_lastcmd = TM_RCOM; /* will serve */
#endif
sc->sc_timo = 60; /* premature, but should serve */
(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 = TM_SFORW;
addr->tmbc = blkno - bdbtofsb(bp->b_blkno);
} else {
bp->b_command = TM_SREV;
addr->tmbc = bdbtofsb(bp->b_blkno) - blkno;
}
sc->sc_timo = imin(imax(10 * -addr->tmbc, 60), 5 * 60);
dobpcmd:
#ifdef notdef
/*
* It is strictly necessary to wait for the tape
* to stop before changing directions, but the TC11
* handles this for us.
*/
if (tmreverseop(sc->sc_lastcmd) != tmreverseop(bp->b_command))
while (addr->tmer & TM_SDWN)
tmgapsdcnt++;
sc->sc_lastcmd = bp->b_command;
#endif
/*
* Do the command in bp.
*/
addr->tmcs = (sc->sc_dens | bp->b_command);
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;
dp->b_actf = bp->av_forw;
iodone(bp);
goto loop;
}
/*
* The UNIBUS resources we needed have been
* allocated to us; start the device.
*/
tmdgo(um)
register struct uba_ctlr *um;
{
register struct tmdevice *addr = (struct tmdevice *)um->um_addr;
addr->tmba = um->um_ubinfo;
addr->tmcs = um->um_cmd | ((um->um_ubinfo >> 12) & 0x30);
}
/*
* Tm interrupt routine.
*/
/*ARGSUSED*/
tmintr(tm11)
int tm11;
{
struct buf *dp;
register struct buf *bp;
register struct uba_ctlr *um = tmminfo[tm11];
register struct tmdevice *addr;
register struct te_softc *sc;
int teunit;
register state;
if ((dp = um->um_tab.b_actf) == NULL)
return;
bp = dp->b_actf;
teunit = TEUNIT(bp->b_dev);
addr = (struct tmdevice *)tedinfo[teunit]->ui_addr;
sc = &te_softc[teunit];
/*
* If last command was a rewind, and tape is still
* rewinding, wait for the rewind complete interrupt.
*/
if (um->um_tab.b_active == SREW) {
um->um_tab.b_active = SCOM;
if (addr->tmer&TMER_RWS) {
sc->sc_timo = 5*60; /* 5 minutes */
return;
}
}
/*
* An operation completed... record status
*/
sc->sc_timo = INF;
sc->sc_dsreg = addr->tmcs;
sc->sc_erreg = addr->tmer;
sc->sc_resid = addr->tmbc;
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->tmcs&TM_ERR) {
while (addr->tmer & TMER_SDWN)
; /* await settle down */
/*
* If we hit the end of the tape file, update our position.
*/
if (addr->tmer&TMER_EOF) {
tmseteof(bp); /* set blkno and nxrec */
state = SCOM; /* force completion */
/*
* Stuff bc so it will be unstuffed correctly
* later to get resid.
*/
addr->tmbc = -bp->b_bcount;
goto opdone;
}
/*
* If we were reading raw tape and the only error was that the
* record was too long, then we don't consider this an error.
*/
if (bp == &rtmbuf[TMUNIT(bp->b_dev)] && (bp->b_flags&B_READ) &&
(addr->tmer&(TMER_HARD|TMER_SOFT)) == TMER_RLE)
goto ignoreerr;
/*
* If error is not hard, and this was an i/o operation
* retry up to 8 times.
*/
if ((addr->tmer&TMER_HARD)==0 && state==SIO) {
if (++um->um_tab.b_errcnt < 7) {
sc->sc_blkno++;
ubadone(um);
goto opcont;
}
} else
/*
* Hard or non-i/o errors on non-raw tape
* cause it to close.
*/
if (sc->sc_openf>0 && bp != &rtmbuf[TMUNIT(bp->b_dev)])
sc->sc_openf = -1;
/*
* Couldn't recover error
*/
printf("te%d: hard error bn%d er=%b\n", minor(bp->b_dev)&03,
bp->b_blkno, sc->sc_erreg, TMER_BITS);
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 == &ctmbuf[TMUNIT(bp->b_dev)])
switch (bp->b_command) {
case TM_SFORW:
sc->sc_blkno -= bp->b_repcnt;
break;
case TM_SREV:
sc->sc_blkno += bp->b_repcnt;
break;
}
goto opdone;
case SSEEK:
sc->sc_blkno = bdbtofsb(bp->b_blkno);
goto opcont;
default:
panic("tmintr");
}
opdone:
/*
* Reset error count and remove
* from device queue.
*/
um->um_tab.b_errcnt = 0;
dp->b_actf = bp->av_forw;
bp->b_resid = -addr->tmbc;
ubadone(um);
iodone(bp);
/*
* Circulate slave to end of controller
* queue to give other slaves a chance.
*/
um->um_tab.b_actf = dp->b_forw;
if (dp->b_actf) {
dp->b_forw = NULL;
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;
}
if (um->um_tab.b_actf == 0)
return;
opcont:
tmstart(um);
}
tmtimer(dev)
int dev;
{
register struct te_softc *sc = &te_softc[TEUNIT(dev)];
register short x;
if (sc->sc_timo != INF && (sc->sc_timo -= 5) < 0) {
printf("te%d: lost interrupt\n", TEUNIT(dev));
sc->sc_timo = INF;
x = spl5();
tmintr(TMUNIT(dev));
(void) splx(x);
}
timeout(tmtimer, (caddr_t)dev, 5*hz);
}
tmseteof(bp)
register struct buf *bp;
{
register int teunit = TEUNIT(bp->b_dev);
register struct tmdevice *addr =
(struct tmdevice *)tedinfo[teunit]->ui_addr;
register struct te_softc *sc = &te_softc[teunit];
if (bp == &ctmbuf[TMUNIT(bp->b_dev)]) {
if (sc->sc_blkno > bdbtofsb(bp->b_blkno)) {
/* reversing */
sc->sc_nxrec = bdbtofsb(bp->b_blkno) - addr->tmbc;
sc->sc_blkno = sc->sc_nxrec;
} else {
/* spacing forward */
sc->sc_blkno = bdbtofsb(bp->b_blkno) + addr->tmbc;
sc->sc_nxrec = sc->sc_blkno - 1;
}
return;
}
/* eof on read */
sc->sc_nxrec = bdbtofsb(bp->b_blkno);
}
tmread(dev, uio)
dev_t dev;
struct uio *uio;
{
int errno;
errno = tmphys(dev, uio);
if (errno)
return (errno);
return (physio(tmstrategy, &rtmbuf[TMUNIT(dev)], dev, B_READ, minphys, uio));
}
tmwrite(dev, uio)
dev_t dev;
struct uio *uio;
{
int errno;
errno = tmphys(dev, uio);
if (errno)
return (errno);
return (physio(tmstrategy, &rtmbuf[TMUNIT(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.
*/
tmphys(dev, uio)
dev_t dev;
struct uio *uio;
{
register int teunit = TEUNIT(dev);
register daddr_t a;
register struct te_softc *sc;
register struct uba_device *ui;
if (teunit >= NTE || (ui=tedinfo[teunit]) == 0 || ui->ui_alive == 0)
return (ENXIO);
sc = &te_softc[teunit];
a = bdbtofsb(uio->uio_offset >> 9);
sc->sc_blkno = a;
sc->sc_nxrec = a + 1;
return (0);
}
tmreset(uban)
int uban;
{
register struct uba_ctlr *um;
register tm11, teunit;
register struct uba_device *ui;
register struct buf *dp;
for (tm11 = 0; tm11 < NTM; tm11++) {
if ((um = tmminfo[tm11]) == 0 || um->um_alive == 0 ||
um->um_ubanum != uban)
continue;
printf(" tm%d", tm11);
um->um_tab.b_active = 0;
um->um_tab.b_actf = um->um_tab.b_actl = 0;
if (um->um_ubinfo) {
printf("<%d>", (um->um_ubinfo>>28)&0xf);
um->um_ubinfo = 0;
}
((struct tmdevice *)(um->um_addr))->tmcs = TM_DCLR;
for (teunit = 0; teunit < NTE; teunit++) {
if ((ui = tedinfo[teunit]) == 0 || ui->ui_mi != um ||
ui->ui_alive == 0)
continue;
dp = &teutab[teunit];
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;
if (te_softc[teunit].sc_openf > 0)
te_softc[teunit].sc_openf = -1;
}
tmstart(um);
}
}
/*ARGSUSED*/
tmioctl(dev, cmd, data, flag)
caddr_t data;
dev_t dev;
{
int teunit = TEUNIT(dev);
register struct te_softc *sc = &te_softc[teunit];
register struct buf *bp = &ctmbuf[TMUNIT(dev)];
register callcount;
int fcount;
struct mtop *mtop;
struct mtget *mtget;
/* we depend of the values and order of the MT codes here */
static tmops[] =
{TM_WEOF,TM_SFORW,TM_SREV,TM_SFORW,TM_SREV,TM_REW,TM_OFFL,TM_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:
callcount = mtop->mt_count;
fcount = INF;
break;
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) {
tmcommand(dev, tmops[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_erreg&TMER_BOT)
break;
}
return (geterror(bp));
case MTIOCGET:
mtget = (struct mtget *)data;
mtget->mt_dsreg = sc->sc_dsreg;
mtget->mt_erreg = sc->sc_erreg;
mtget->mt_resid = sc->sc_resid;
mtget->mt_type = MT_ISTM;
break;
default:
return (ENXIO);
}
return (0);
}
#define DBSIZE 20
tmdump()
{
register struct uba_device *ui;
register struct uba_regs *up;
register struct tmdevice *addr;
int blk, num;
int start;
start = 0;
num = maxfree;
#define phys(a,b) ((b)((int)(a)&0x7fffffff))
if (tedinfo[0] == 0)
return (ENXIO);
ui = phys(tedinfo[0], struct uba_device *);
up = phys(ui->ui_hd, struct uba_hd *)->uh_physuba;
ubainit(up);
DELAY(1000000);
addr = (struct tmdevice *)ui->ui_physaddr;
tmwait(addr);
addr->tmcs = TM_DCLR | TM_GO;
while (num > 0) {
blk = num > DBSIZE ? DBSIZE : num;
tmdwrite(start, blk, addr, up);
start += blk;
num -= blk;
}
tmeof(addr);
tmeof(addr);
tmwait(addr);
if (addr->tmcs&TM_ERR)
return (EIO);
addr->tmcs = TM_REW | TM_GO;
tmwait(addr);
return (0);
}
tmdwrite(dbuf, num, addr, up)
register dbuf, num;
register struct tmdevice *addr;
struct uba_regs *up;
{
register struct pte *io;
register int npf;
tmwait(addr);
io = up->uba_map;
npf = num+1;
while (--npf != 0)
*(int *)io++ = (dbuf++ | (1<<UBAMR_DPSHIFT) | UBAMR_MRV);
*(int *)io = 0;
addr->tmbc = -(num*NBPG);
addr->tmba = 0;
addr->tmcs = TM_WCOM | TM_GO;
}
tmwait(addr)
register struct tmdevice *addr;
{
register s;
do
s = addr->tmcs;
while ((s & TM_CUR) == 0);
}
tmeof(addr)
struct tmdevice *addr;
{
tmwait(addr);
addr->tmcs = TM_WEOF | TM_GO;
}
#endif