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simh-testsetgenerator/pdp11_tm.c
Bob Supnik 4d6dfa4bdb simh v2.6
2011-04-15 08:33:28 -07:00

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/* pdp11_tm.c: PDP-11 magnetic tape simulator
Copyright (c) 1993-2001, Robert M Supnik
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of Robert M Supnik shall not
be used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from Robert M Supnik.
tm TM11/TU10 magtape
26-Apr-01 RMS Added device enable/disable support
18-Apr-01 RMS Changed to rewind tape before boot
14-Apr-99 RMS Changed t_addr to unsigned
04-Oct-98 RMS V2.4 magtape format
10-May-98 RMS Fixed bug with non-zero unit operation (from Steven Schultz)
09-May-98 RMS Fixed problems in bootstrap (from Steven Schultz)
10-Apr-98 RMS Added 2nd block bootstrap (from John Holden,
University of Sydney)
31-Jul-97 RMS Added bootstrap (from Ethan Dicks, Ohio State)
22-Jan-97 RMS V2.3 magtape format
18-Jan-97 RMS Fixed double interrupt, error flag bugs
29-Jun-96 RMS Added unit disable support
Magnetic tapes are represented as a series of variable 8b records
of the form:
32b record length in bytes - exact number
byte 0
byte 1
:
byte n-2
byte n-1
32b record length in bytes - exact number
If the byte count is odd, the record is padded with an extra byte
of junk. File marks are represented by a single record length of 0.
End of tape is two consecutive end of file marks.
*/
#include "pdp11_defs.h"
#define TM_NUMDR 8 /* #drives */
#define UNIT_V_WLK (UNIT_V_UF + 0) /* write locked */
#define UNIT_WLK 1 << UNIT_V_WLK
#define UNIT_W_UF 2 /* saved user flags */
#define USTAT u3 /* unit status */
#define UNUM u4 /* unit number */
#define DBSIZE (1 << 16) /* max data buf */
#define DBMASK (SBSIZE - 1)
/* Command - tm_cmd */
#define MTC_ERR (1 << CSR_V_ERR) /* error */
#define MTC_V_DEN 13 /* density */
#define MTC_M_DEN 03
#define MTC_DEN (MTC_M_DEN << MTC_V_DEN)
#define MTC_INIT 0010000 /* init */
#define MTC_LPAR 0004000 /* parity select */
#define MTC_V_UNIT 8 /* unit */
#define MTC_M_UNIT 07
#define MTC_UNIT (MTC_M_UNIT << MTC_V_UNIT)
#define MTC_DONE (1 << CSR_V_DONE) /* done */
#define MTC_IE (1 << CSR_V_IE) /* interrupt enable */
#define MTC_V_EMA 4 /* ext mem address */
#define MTC_M_EMA 03
#define MTC_EMA (MTC_M_EMA << MTC_V_EMA)
#define MTC_V_FNC 1 /* function */
#define MTC_M_FNC 07
#define MTC_UNLOAD 00
#define MTC_READ 01
#define MTC_WRITE 02
#define MTC_WREOF 03
#define MTC_SPACEF 04
#define MTC_SPACER 05
#define MTC_WREXT 06
#define MTC_REWIND 07
#define MTC_FNC (MTC_M_FNC << MTC_V_FNC)
#define MTC_GO (1 << CSR_V_GO) /* go */
#define MTC_RW (MTC_DEN | MTC_LPAR | MTC_UNIT | MTC_IE | \
MTC_EMA | MTC_FNC)
#define GET_EMA(x) (((x) & MTC_EMA) << (16 - MTC_V_EMA))
#define GET_UNIT(x) (((x) >> MTC_V_UNIT) & MTC_M_UNIT)
#define GET_FNC(x) (((x) >> MTC_V_FNC) & MTC_M_FNC)
/* Status - stored in tm_sta or (*) uptr -> USTAT or (+) calculated */
#define STA_ILL 0100000 /* illegal */
#define STA_EOF 0040000 /* *end of file */
#define STA_CRC 0020000 /* CRC error */
#define STA_PAR 0010000 /* parity error */
#define STA_DLT 0004000 /* data late */
#define STA_EOT 0002000 /* *end of tape */
#define STA_RLE 0001000 /* rec lnt error */
#define STA_BAD 0000400 /* bad tape error */
#define STA_NXM 0000200 /* non-existent mem */
#define STA_ONL 0000100 /* *online */
#define STA_BOT 0000040 /* *start of tape */
#define STA_7TK 0000020 /* 7 track */
#define STA_SDN 0000010 /* settle down */
#define STA_WLK 0000004 /* *write locked */
#define STA_REW 0000002 /* *rewinding */
#define STA_TUR 0000001 /* +unit ready */
#define STA_CLR (STA_7TK | STA_SDN) /* always clear */
#define STA_DYN (STA_EOF | STA_EOT | STA_ONL | STA_BOT | \
STA_WLK | STA_REW | STA_TUR) /* kept in USTAT */
#define STA_EFLGS (STA_ILL | STA_EOF | STA_CRC | STA_PAR | \
STA_DLT | STA_EOT | STA_RLE | STA_BAD | STA_NXM)
/* set error */
extern uint16 *M; /* memory */
extern int32 int_req, dev_enb;
extern UNIT cpu_unit;
int32 tm_sta = 0; /* status register */
int32 tm_cmd = 0; /* command register */
int32 tm_ca = 0; /* current address */
int32 tm_bc = 0; /* byte count */
int32 tm_db = 0; /* data buffer */
int32 tm_time = 10; /* record latency */
int32 tm_stopioe = 1; /* stop on error */
t_stat tm_svc (UNIT *uptr);
t_stat tm_reset (DEVICE *dptr);
t_stat tm_attach (UNIT *uptr, char *cptr);
t_stat tm_detach (UNIT *uptr);
t_stat tm_boot (int32 unitno);
void tm_go (UNIT *uptr);
int32 tm_updcsta (UNIT *uptr);
void tm_set_done (void);
t_stat tm_vlock (UNIT *uptr, int32 val);
/* MT data structures
tm_dev MT device descriptor
tm_unit MT unit list
tm_reg MT register list
tm_mod MT modifier list
*/
UNIT tm_unit[] = {
{ UDATA (&tm_svc, UNIT_ATTABLE + UNIT_DISABLE, 0) },
{ UDATA (&tm_svc, UNIT_ATTABLE + UNIT_DISABLE, 0) },
{ UDATA (&tm_svc, UNIT_ATTABLE + UNIT_DISABLE, 0) },
{ UDATA (&tm_svc, UNIT_ATTABLE + UNIT_DISABLE, 0) },
{ UDATA (&tm_svc, UNIT_ATTABLE + UNIT_DISABLE, 0) },
{ UDATA (&tm_svc, UNIT_ATTABLE + UNIT_DISABLE, 0) },
{ UDATA (&tm_svc, UNIT_ATTABLE + UNIT_DISABLE, 0) },
{ UDATA (&tm_svc, UNIT_ATTABLE + UNIT_DISABLE, 0) } };
REG tm_reg[] = {
{ ORDATA (MTS, tm_sta, 16) },
{ ORDATA (MTC, tm_cmd, 16) },
{ ORDATA (MTBRC, tm_bc, 16) },
{ ORDATA (MTCMA, tm_ca, 16) },
{ ORDATA (MTD, tm_db, 8) },
{ FLDATA (INT, int_req, INT_V_TM) },
{ FLDATA (ERR, tm_cmd, CSR_V_ERR) },
{ FLDATA (DONE, tm_cmd, CSR_V_DONE) },
{ FLDATA (IE, tm_cmd, CSR_V_IE) },
{ FLDATA (STOP_IOE, tm_stopioe, 0) },
{ DRDATA (TIME, tm_time, 24), PV_LEFT },
{ ORDATA (UST0, tm_unit[0].USTAT, 16) },
{ ORDATA (UST1, tm_unit[1].USTAT, 16) },
{ ORDATA (UST2, tm_unit[2].USTAT, 16) },
{ ORDATA (UST3, tm_unit[3].USTAT, 16) },
{ ORDATA (UST4, tm_unit[4].USTAT, 16) },
{ ORDATA (UST5, tm_unit[5].USTAT, 16) },
{ ORDATA (UST6, tm_unit[6].USTAT, 16) },
{ ORDATA (UST7, tm_unit[7].USTAT, 16) },
{ DRDATA (POS0, tm_unit[0].pos, 31), PV_LEFT + REG_RO },
{ DRDATA (POS1, tm_unit[1].pos, 31), PV_LEFT + REG_RO },
{ DRDATA (POS2, tm_unit[2].pos, 31), PV_LEFT + REG_RO },
{ DRDATA (POS3, tm_unit[3].pos, 31), PV_LEFT + REG_RO },
{ DRDATA (POS4, tm_unit[4].pos, 31), PV_LEFT + REG_RO },
{ DRDATA (POS5, tm_unit[5].pos, 31), PV_LEFT + REG_RO },
{ DRDATA (POS6, tm_unit[6].pos, 31), PV_LEFT + REG_RO },
{ DRDATA (POS7, tm_unit[7].pos, 31), PV_LEFT + REG_RO },
{ GRDATA (FLG0, tm_unit[0].flags, 8, UNIT_W_UF, UNIT_V_UF - 1),
REG_HRO },
{ GRDATA (FLG1, tm_unit[1].flags, 8, UNIT_W_UF, UNIT_V_UF - 1),
REG_HRO },
{ GRDATA (FLG2, tm_unit[2].flags, 8, UNIT_W_UF, UNIT_V_UF - 1),
REG_HRO },
{ GRDATA (FLG3, tm_unit[3].flags, 8, UNIT_W_UF, UNIT_V_UF - 1),
REG_HRO },
{ GRDATA (FLG4, tm_unit[4].flags, 8, UNIT_W_UF, UNIT_V_UF - 1),
REG_HRO },
{ GRDATA (FLG5, tm_unit[5].flags, 8, UNIT_W_UF, UNIT_V_UF - 1),
REG_HRO },
{ GRDATA (FLG6, tm_unit[6].flags, 8, UNIT_W_UF, UNIT_V_UF - 1),
REG_HRO },
{ GRDATA (FLG7, tm_unit[7].flags, 8, UNIT_W_UF, UNIT_V_UF - 1),
REG_HRO },
{ FLDATA (*DEVENB, dev_enb, INT_V_TM), REG_HRO },
{ NULL } };
MTAB tm_mod[] = {
{ UNIT_WLK, 0, "write enabled", "ENABLED", &tm_vlock },
{ UNIT_WLK, UNIT_WLK, "write locked", "LOCKED", &tm_vlock },
{ 0 } };
DEVICE tm_dev = {
"TM", tm_unit, tm_reg, tm_mod,
TM_NUMDR, 10, 31, 1, 8, 8,
NULL, NULL, &tm_reset,
&tm_boot, &tm_attach, &tm_detach };
/* I/O dispatch routine, I/O addresses 17772520 - 17772532
17772520 MTS read only, constructed from tm_sta
plus current drive status flags
17772522 MTC read/write
17772524 MTBRC read/write
17772526 MTCMA read/write
17772530 MTD read/write
17772532 MTRD unimplemented
*/
t_stat tm_rd (int32 *data, int32 PA, int32 access)
{
UNIT *uptr;
uptr = tm_dev.units + GET_UNIT (tm_cmd); /* get unit */
switch ((PA >> 1) & 07) { /* decode PA<3:1> */
case 0: /* MTS */
*data = tm_updcsta (uptr); /* update status */
return SCPE_OK;
case 1: /* MTC */
tm_updcsta (uptr); /* update status */
*data = tm_cmd; /* return command */
return SCPE_OK;
case 2: /* MTBRC */
*data = tm_bc; /* return byte count */
return SCPE_OK;
case 3: /* MTCMA */
*data = tm_ca; /* return mem addr */
return SCPE_OK;
case 4: /* MTD */
*data = tm_db; /* return data buffer */
return SCPE_OK;
default: /* unimplemented */
*data = 0;
return SCPE_OK; }
}
t_stat tm_wr (int32 data, int32 PA, int32 access)
{
UNIT *uptr;
switch ((PA >> 1) & 07) { /* decode PA<3:1> */
case 0: /* MTS: read only */
return SCPE_OK;
case 1: /* MTC */
uptr = tm_dev.units + GET_UNIT (tm_cmd); /* select unit */
if ((tm_cmd & MTC_DONE) == 0) tm_sta = tm_sta | STA_ILL;
else { if (access == WRITEB) data = (PA & 1)?
(tm_cmd & 0377) | (data << 8):
(tm_cmd & ~0377) | data;
if (data & MTC_INIT) { /* init? */
tm_reset (&tm_dev); /* reset device */
return SCPE_OK; }
if ((data & MTC_IE) == 0) /* int disable? */
int_req = int_req & ~INT_TM; /* clr int request */
else if ((tm_cmd & (MTC_ERR + MTC_DONE)) && !(tm_cmd & MTC_IE))
int_req = int_req | INT_TM; /* set int request */
tm_cmd = (tm_cmd & ~MTC_RW) | (data & MTC_RW);
uptr = tm_dev.units + GET_UNIT (tm_cmd); /* new unit */
if (data & MTC_GO) tm_go (uptr); } /* new function? */
tm_updcsta (uptr); /* update status */
return SCPE_OK;
case 2: /* MTBRC */
if (access == WRITEB) data = (PA & 1)?
(tm_bc & 0377) | (data << 8): (tm_bc & ~0377) | data;
tm_bc = data;
return SCPE_OK;
case 3: /* MTCMA */
if (access == WRITEB) data = (PA & 1)?
(tm_ca & 0377) | (data << 8): (tm_ca & ~0377) | data;
tm_ca = data;
return SCPE_OK;
case 4: /* MTD */
if ((access == WRITEB) && (PA & 1)) return SCPE_OK;
tm_db = data & 0377;
return SCPE_OK;
default:
return SCPE_OK; } /* end switch */
}
/* New magtape command */
void tm_go (UNIT *uptr)
{
int32 f;
f = GET_FNC (tm_cmd); /* get function */
if (((uptr -> flags & UNIT_ATT) == 0) || /* not attached? */
sim_is_active (uptr) || /* busy? */
(((f == MTC_WRITE) || (f == MTC_WREOF) || (f == MTC_WREXT)) &&
(uptr -> flags & UNIT_WLK))) { /* write locked? */
tm_sta = tm_sta | STA_ILL; /* illegal */
tm_set_done (); /* set done */
return; }
uptr -> USTAT = uptr -> USTAT & (STA_WLK | STA_ONL); /* clear status */
tm_sta = 0; /* clear errors */
if (f == MTC_UNLOAD) { /* unload? */
uptr -> USTAT = (uptr -> USTAT | STA_REW) & ~STA_ONL;
detach_unit (uptr); } /* set offline */
else if (f == MTC_REWIND) /* rewind */
uptr -> USTAT = uptr -> USTAT | STA_REW; /* rewinding */
/* else /* uncomment this else if rewind/unload don't set done */
tm_cmd = tm_cmd & ~MTC_DONE; /* clear done */
int_req = int_req & ~INT_TM; /* clear int */
sim_activate (uptr, tm_time); /* start io */
return;
}
/* Unit service
If rewind done, reposition to start of tape, set status
else, do operation, set done, interrupt
*/
t_stat tm_svc (UNIT *uptr)
{
int32 f, i, p, err;
t_addr xma;
t_stat rval;
t_mtrlnt tbc, cbc;
uint16 c;
static uint8 dbuf[DBSIZE];
static t_mtrlnt bceof = { 0 };
if (uptr -> USTAT & STA_REW) { /* rewind? */
uptr -> pos = 0; /* update position */
if (uptr -> flags & UNIT_ATT) /* still on line? */
uptr -> USTAT = STA_ONL | STA_BOT |
((uptr -> flags & UNIT_WLK)? STA_WLK: 0);
else uptr -> USTAT = 0;
if (uptr -> UNUM == GET_UNIT (tm_cmd)) { /* selected? */
tm_set_done (); /* set done */
tm_updcsta (uptr); } /* update status */
return SCPE_OK; }
if ((uptr -> flags & UNIT_ATT) == 0) { /* if not attached */
uptr -> USTAT = 0; /* unit off line */
tm_sta = tm_sta | STA_ILL; /* illegal operation */
tm_set_done (); /* set done */
tm_updcsta (uptr); /* update status */
return IORETURN (tm_stopioe, SCPE_UNATT); }
f = GET_FNC (tm_cmd); /* get command */
if (((f == MTC_WRITE) || (f == MTC_WREOF) || (f == MTC_WREXT)) &&
(uptr -> flags & UNIT_WLK)) { /* write and locked? */
tm_sta = tm_sta | STA_ILL; /* illegal operation */
tm_set_done (); /* set done */
tm_updcsta (uptr); /* update status */
return SCPE_OK; }
err = 0;
rval = SCPE_OK;
xma = GET_EMA (tm_cmd) | tm_ca; /* get mem addr */
cbc = 0200000 - tm_bc; /* get bc */
switch (f) { /* case on function */
/* Unit service, continued */
case MTC_READ: /* read */
fseek (uptr -> fileref, uptr -> pos, SEEK_SET);
fxread (&tbc, sizeof (t_mtrlnt), 1, uptr -> fileref);
if ((err = ferror (uptr -> fileref)) || /* error or eof? */
(feof (uptr -> fileref))) {
uptr -> USTAT = uptr -> USTAT | STA_EOT;
break; }
if (tbc == 0) { /* tape mark? */
uptr -> USTAT = uptr -> USTAT | STA_EOF;
uptr -> pos = uptr -> pos + sizeof (t_mtrlnt);
break; }
tbc = MTRL (tbc); /* ignore error flag */
if (tbc > cbc) tm_sta = tm_sta | STA_RLE; /* wrong size? */
if (tbc < cbc) cbc = tbc; /* use smaller */
i = fxread (dbuf, sizeof (int8), cbc, uptr -> fileref);
for ( ; i < tbc; i++) dbuf[i] = 0; /* fill with 0's */
err = ferror (uptr -> fileref);
for (i = 0; i < cbc; i++) { /* copy buffer */
if (xma >= MEMSIZE) { /* nx memory? */
tm_sta = tm_sta | STA_NXM;
break; }
p = xma >> 1; /* word address */
c = dbuf[i]; /* character */
if (i & 1) M[p] = (M[p] & 0377) | (c << 8);
else M[p] = (M[p] & 0177400) | c;
xma = (xma + 1) & 0777777;
tm_bc = (tm_bc + 1) & 0177777; }
uptr -> pos = uptr -> pos + ((tbc + 1) & ~1) +
(2 * sizeof (t_mtrlnt));
break;
case MTC_WRITE: /* write */
case MTC_WREXT: /* write ext gap */
fseek (uptr -> fileref, uptr -> pos, SEEK_SET);
fxwrite (&cbc, sizeof (t_mtrlnt), 1, uptr -> fileref);
for (i = 0; i < cbc; i++) { /* copy buf to tape */
if (xma >= MEMSIZE) { /* nx memory? */
tm_sta = tm_sta | STA_NXM;
break; }
if (i & 1) dbuf[i] = (M[xma >> 1] >> 8) & 0377;
else dbuf[i] = M[xma >> 1] & 0377;
xma = (xma + 1) & 0777777;
tm_bc = (tm_bc + 1) & 0177777; }
fxwrite (dbuf, sizeof (int8), cbc, uptr -> fileref);
fxwrite (&cbc, sizeof (t_mtrlnt), 1, uptr -> fileref);
err = ferror (uptr -> fileref);
uptr -> pos = uptr -> pos + ((cbc + 1) & ~1) +
(2 * sizeof (t_mtrlnt));
break;
case MTC_WREOF:
fseek (uptr -> fileref, uptr -> pos, SEEK_SET);
fxwrite (&bceof, sizeof (t_mtrlnt), 1, uptr -> fileref);
err = ferror (uptr -> fileref);
uptr -> pos = uptr -> pos + sizeof (t_mtrlnt); /* update position */
break;
/* Unit service, continued */
case MTC_SPACEF: /* space forward */
do { tm_bc = (tm_bc + 1) & 0177777; /* incr wc */
fseek (uptr -> fileref, uptr -> pos, SEEK_SET);
fxread (&tbc, sizeof (t_mtrlnt), 1, uptr -> fileref);
if ((err = ferror (uptr -> fileref)) || /* error or eof? */
feof (uptr -> fileref)) {
uptr -> USTAT = uptr -> USTAT | STA_EOT;
break; }
if (tbc == 0) { /* zero bc? */
uptr -> USTAT = uptr -> USTAT | STA_EOF;
uptr -> pos = uptr -> pos + sizeof (t_mtrlnt);
break; }
uptr -> pos = uptr -> pos + ((MTRL (tbc) + 1) & ~1) +
(2 * sizeof (t_mtrlnt)); }
while (tm_bc != 0);
break;
case MTC_SPACER: /* space reverse */
if (uptr -> pos == 0) { /* at BOT? */
uptr -> USTAT = uptr -> USTAT | STA_BOT;
break; }
do { tm_bc = (tm_bc + 1) & 0177777; /* incr wc */
fseek (uptr -> fileref, uptr -> pos - sizeof (t_mtrlnt),
SEEK_SET);
fxread (&tbc, sizeof (t_mtrlnt), 1, uptr -> fileref);
if ((err = ferror (uptr -> fileref)) || /* error or eof? */
feof (uptr -> fileref)) {
uptr -> USTAT = uptr -> USTAT | STA_BOT;
uptr -> pos = 0;
break; }
if (tbc == 0) { /* start of prv file? */
uptr -> USTAT = uptr -> USTAT | STA_EOF;
uptr -> pos = uptr -> pos - sizeof (t_mtrlnt);
break; }
uptr -> pos = uptr -> pos - ((MTRL (tbc) + 1) & ~1) -
(2 * sizeof (t_mtrlnt));
if (uptr -> pos == 0) { /* start of tape? */
uptr -> USTAT = uptr -> USTAT | STA_BOT;
break; } }
while (tm_bc != 0);
break; } /* end case */
/* Unit service, continued */
if (err != 0) { /* I/O error */
tm_sta = tm_sta | STA_PAR | STA_CRC; /* flag error */
perror ("MT I/O error");
rval = SCPE_IOERR;
clearerr (uptr -> fileref); }
tm_cmd = (tm_cmd & ~MTC_EMA) | ((xma >> (16 - MTC_V_EMA)) & MTC_EMA);
tm_ca = xma & 0177777; /* update mem addr */
tm_set_done (); /* set done */
tm_updcsta (uptr); /* update status */
return IORETURN (tm_stopioe, rval);
}
/* Update controller status */
int32 tm_updcsta (UNIT *uptr)
{
tm_sta = (tm_sta & ~(STA_DYN | STA_CLR)) | (uptr -> USTAT & STA_DYN);
if (sim_is_active (uptr)) tm_sta = tm_sta & ~STA_TUR;
else tm_sta = tm_sta | STA_TUR;
if (tm_sta & STA_EFLGS) tm_cmd = tm_cmd | MTC_ERR;
else tm_cmd = tm_cmd & ~MTC_ERR;
if ((tm_cmd & MTC_IE) == 0) int_req = int_req & ~INT_TM;
return tm_sta;
}
/* Set done */
void tm_set_done (void)
{
tm_cmd = tm_cmd | MTC_DONE;
if (tm_cmd & MTC_IE) int_req = int_req | INT_TM;
return;
}
/* Reset routine */
t_stat tm_reset (DEVICE *dptr)
{
int32 u;
UNIT *uptr;
if (dev_enb & INT_TM) dev_enb = dev_enb & ~INT_TS; /* TM or TS */
tm_cmd = MTC_DONE; /* set done */
tm_bc = tm_ca = tm_db = tm_sta = 0;
int_req = int_req & ~INT_TM; /* clear interrupt */
for (u = 0; u < TM_NUMDR; u++) { /* loop thru units */
uptr = tm_dev.units + u;
uptr -> UNUM = u; /* init drive number */
sim_cancel (uptr); /* cancel activity */
if (uptr -> flags & UNIT_ATT) uptr -> USTAT = STA_ONL |
((uptr -> pos)? 0: STA_BOT) |
((uptr -> flags & UNIT_WLK)? STA_WLK: 0);
else uptr -> USTAT = 0; }
return SCPE_OK;
}
/* Attach routine */
t_stat tm_attach (UNIT *uptr, char *cptr)
{
t_stat r;
r = attach_unit (uptr, cptr);
if (r != SCPE_OK) return r;
uptr -> USTAT = STA_ONL | STA_BOT | ((uptr -> flags & UNIT_WLK)? STA_WLK: 0);
if (uptr -> UNUM == GET_UNIT (tm_cmd)) tm_updcsta (uptr);
return r;
}
/* Detach routine */
t_stat tm_detach (UNIT* uptr)
{
if (!sim_is_active (uptr)) uptr -> USTAT = 0;
if (uptr -> UNUM == GET_UNIT (tm_cmd)) tm_updcsta (uptr);
return detach_unit (uptr);
}
/* Write lock/enable routine */
t_stat tm_vlock (UNIT *uptr, int32 val)
{
if ((uptr -> flags & UNIT_ATT) && val) uptr -> USTAT = uptr -> USTAT | STA_WLK;
else uptr -> USTAT = uptr -> USTAT & ~STA_WLK;
if (uptr -> UNUM == GET_UNIT (tm_cmd)) tm_updcsta (uptr);
return SCPE_OK;
}
/* Device bootstrap
Magtape boot format changed over time. Originally, a boot tape
contained a boot loader in the first block. Eventually, the first
block was reserved for a tape label, and the second block was
expected to contain a boot loader. BSD and DEC operating systems
use the second block scheme, so it is the default.
To boot from the first block, use boot -o (old).
*/
#define BOOT_START 040000
#define BOOT_UNIT (BOOT_START + 6)
#define BOOT1_LEN (sizeof (boot1_rom) / sizeof (int32))
#define BOOT2_LEN (sizeof (boot2_rom) / sizeof (int32))
static const int32 boot1_rom[] = {
0012706, 0040000, /* mov #boot_start, sp */
0012700, 0000000, /* mov #unit_num, r0 */
0012701, 0172526, /* mov #172526, r1 ; mtcma */
0005011, /* clr (r1) */
0011041, /* mov r1, -(r1) ; mtbrc */
0010002, /* mov r0,r2 */
0000302, /* swab r2 */
0062702, 0060003, /* add #60003, r2 */
0010241, /* mov r2, -(r1) ; read + go */
0105711, /* tstb (r1) ; mtc */
0100376, /* bpl .-2 */
0005002, /* clr r2 */
0005003, /* clr r3 */
0005004, /* clr r4 */
0012705, 0052115, /* mov #MT, r5 */
0005007 /* clr r7 */
};
static const int32 boot2_rom[] = {
0012706, 0040000, /* mov #boot_start, sp */
0012700, 0000000, /* mov #unit_num, r0 */
0012701, 0172526, /* mov #172526, r1 ; mtcma */
0005011, /* clr (r1) */
0012741, 0177777, /* mov #-1, -(r1) ; mtbrc */
0010002, /* mov r0,r2 */
0000302, /* swab r2 */
0062702, 0060011, /* add #60011, r2 */
0010241, /* mov r2, -(r1) ; space + go */
0105711, /* tstb (r1) ; mtc */
0100376, /* bpl .-2 */
0010002, /* mov r0,r2 */
0000302, /* swab r2 */
0062702, 0060003, /* add #60003, r2 */
0010211, /* mov r2, (r1) ; read + go */
0105711, /* tstb (r1) ; mtc */
0100376, /* bpl .-2 */
0005002, /* clr r2 */
0005003, /* clr r3 */
0005004, /* clr r4 */
0012705, 0052115, /* mov #MT, r5 */
0005007 /* clr r7 */
};
t_stat tm_boot (int32 unitno)
{
int32 i;
extern int32 saved_PC;
extern int32 sim_switches;
tm_unit[unitno].pos = 0;
if (sim_switches & SWMASK ('O')) {
for (i = 0; i < BOOT1_LEN; i++)
M[(BOOT_START >> 1) + i] = boot1_rom[i]; }
else { for (i = 0; i < BOOT2_LEN; i++)
M[(BOOT_START >> 1) + i] = boot2_rom[i]; }
M[BOOT_UNIT >> 1] = unitno;
saved_PC = BOOT_START;
return SCPE_OK;
}
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