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simh-testsetgenerator/PDP18B/pdp18b_mt.c
Mark Pizzolato 5531ccb175 ALL: Massive 'const' cleanup 
These changes facilitate more robust parameter type checking and helps
to identify unexpected coding errors.

Most simulators can now also be compiled with a C++ compiler without
warnings.

Additionally, these changes have also been configured to facilitate easier
backporting of simulator and device simulation modules to run under the
simh v3.9+ SCP framework.
2016-05-15 15:25:33 -07:00

533 lines
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/* pdp18b_mt.c: 18b PDP magnetic tape simulator
Copyright (c) 1993-2016, 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.
mt (PDP-9) TC59 magtape
(PDP-15) TC59D magtape
10-Mar-16 RMS Added 3-cycle databreak set/show entries
07-Mar-16 RMS Revised for dynamically allocated memory
13-Sep-15 RMS Added APIVEC register
14-Nov-08 RMS Replaced mt_log with standard debug facility
16-Feb-06 RMS Added tape capacity checking
16-Aug-05 RMS Fixed C++ declaration and cast problems
18-Mar-05 RMS Added attached test to detach routine
14-Jan-04 RMS Revised IO device call interface
25-Apr-03 RMS Revised for extended file support
28-Mar-03 RMS Added multiformat support
04-Mar-03 RMS Fixed bug in MTTR
01-Mar-03 RMS Fixed bug in interrupt handling
Revised for magtape library
02-Feb-03 RMS Revised IOT decoding
30-Oct-02 RMS Revised BOT handling, added error record handling
05-Oct-02 RMS Added DIB, device number support
Revamped error recovery
28-Aug-02 RMS Added end of medium support
30-May-02 RMS Widened POS to 32b
22-Apr-02 RMS Added maximum record length test
06-Jan-02 RMS Revised enabled/disable support
29-Nov-01 RMS Added read only unit support
25-Nov-01 RMS Revised interrupt structure
Changed UST, POS, FLG to arrays
26-Apr-01 RMS Added device enable/disable support
15-Feb-01 RMS Fixed 3-cycle data break sequence
04-Oct-98 RMS V2.4 magtape format
22-Jan-97 RMS V2.3 magtape format
29-Jun-96 RMS Added unit enable/disable support
Magnetic tapes are represented as a series of variable records
of the form:
32b byte count
byte 0
byte 1
:
byte n-2
byte n-1
32 byte count
If the byte count is odd, the record is padded with an extra byte
of junk. File marks are represented by a byte count of 0.
*/
#include "pdp18b_defs.h"
#include "sim_tape.h"
#define MT_NUMDR 8 /* #drives */
#define USTAT u3 /* unit status */
#define MT_MAXFR (1 << 16) /* max record length */
#define MT_WC 032 /* word count */
#define MT_CA 033 /* current addr */
#define WC_SIZE (1 << 12) /* max word count */
#define WC_MASK (WC_SIZE - 1)
/* Command/unit - mt_cu */
#define CU_V_UNIT 15 /* unit */
#define CU_M_UNIT 07
#define CU_PARITY 0040000 /* parity select */
#define CU_DUMP 0020000 /* dump mode */
#define CU_ERASE 0010000 /* ext rec gap */
#define CU_V_CMD 9 /* command */
#define CU_M_CMD 07
#define FN_NOP 00
#define FN_REWIND 01
#define FN_READ 02
#define FN_CMPARE 03
#define FN_WRITE 04
#define FN_WREOF 05
#define FN_SPACEF 06
#define FN_SPACER 07
#define CU_IE 0000400 /* interrupt enable */
#define CU_V_TYPE 6 /* drive type */
#define CU_M_TYPE 03
#define TY_9TK 3
#define GET_UNIT(x) (((x) >> CU_V_UNIT) & CU_M_UNIT)
#define GET_CMD(x) (((x) >> CU_V_CMD) & CU_M_CMD)
#define GET_TYPE(x) (((x) >> CU_V_TYPE) & CU_M_TYPE)
#define PACKED(x) (((x) & CU_DUMP) || (GET_TYPE (x) != TY_9TK))
/* Status - stored in mt_sta or (*) uptr->USTAT */
#define STA_ERR 0400000 /* error */
#define STA_REW 0200000 /* *rewinding */
#define STA_BOT 0100000 /* *start of tape */
#define STA_ILL 0040000 /* illegal cmd */
#define STA_PAR 0020000 /* parity error */
#define STA_EOF 0010000 /* *end of file */
#define STA_EOT 0004000 /* *end of tape */
#define STA_CPE 0002000 /* compare error */
#define STA_RLE 0001000 /* rec lnt error */
#define STA_DLT 0000400 /* data late */
#define STA_BAD 0000200 /* bad tape */
#define STA_DON 0000100 /* done */
#define STA_CLR 0000077 /* always clear */
#define STA_DYN (STA_REW | STA_BOT | STA_EOF | STA_EOT)
/* kept in USTAT */
extern int32 *M;
extern int32 int_hwre[API_HLVL+1];
extern int32 api_vec[API_HLVL][32];
extern UNIT cpu_unit;
int32 mt_cu = 0; /* command/unit */
int32 mt_sta = 0; /* status register */
int32 mt_time = 10; /* record latency */
int32 mt_stopioe = 1; /* stop on error */
uint8 *mtxb = NULL; /* transfer buffer */
int32 mt (int32 dev, int32 pulse, int32 dat);
int32 mt_iors (void);
t_stat mt_svc (UNIT *uptr);
t_stat mt_reset (DEVICE *dptr);
t_stat mt_attach (UNIT *uptr, CONST char *cptr);
t_stat mt_detach (UNIT *uptr);
int32 mt_updcsta (UNIT *uptr, int32 val);
t_stat mt_map_err (UNIT *uptr, t_stat st);
UNIT *mt_busy (void);
/* MT data structures
mt_dev MT device descriptor
mt_unit MT unit list
mt_reg MT register list
mt_mod MT modifier list
*/
DIB mt_dib = { DEV_MT, 1, &mt_iors, { &mt } };
UNIT mt_unit[] = {
{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) }
};
REG mt_reg[] = {
{ ORDATAD (STA, mt_sta, 18, "main status") },
{ ORDATAD (CMD, mt_cu, 18, "command") },
{ FLDATAD (INT, int_hwre[API_MTA], INT_V_MTA, "interrupt pending flag") },
{ FLDATAD (STOP_IOE, mt_stopioe, 0, "stop on I/O error") },
{ DRDATAD (TIME, mt_time, 24, "record delay"), PV_LEFT },
{ URDATAD (UST, mt_unit[0].USTAT, 8, 16, 0, MT_NUMDR, 0, "unit status, units 0 to 7") },
{ URDATAD (POS, mt_unit[0].pos, 10, T_ADDR_W, 0,
MT_NUMDR, PV_LEFT | REG_RO, "position units 0 to 7") },
{ ORDATA (DEVNO, mt_dib.dev, 6), REG_HRO },
{ ORDATA (APIVEC, api_vec[API_MTA][INT_V_MTA], 6), REG_HRO },
{ NULL }
};
MTAB mt_mod[] = {
{ MTUF_WLK, 0, "write enabled", "WRITEENABLED", NULL },
{ MTUF_WLK, MTUF_WLK, "write locked", "LOCKED", NULL },
{ MTAB_XTD|MTAB_VUN, 0, "FORMAT", "FORMAT",
&sim_tape_set_fmt, &sim_tape_show_fmt, NULL },
{ MTAB_XTD|MTAB_VUN, 0, "TCAPACITY", "TCAPACITY",
&sim_tape_set_capac, &sim_tape_show_capac, NULL },
{ MTAB_XTD|MTAB_VDV|MTAB_NMO, MT_WC, "WC", "WC", &set_3cyc_reg, &show_3cyc_reg, (void *)"WC" },
{ MTAB_XTD|MTAB_VDV|MTAB_NMO, MT_CA, "CA", "CA", &set_3cyc_reg, &show_3cyc_reg, (void *)"CA" },
{ MTAB_XTD|MTAB_VDV, 0, "DEVNO", "DEVNO", &set_devno, &show_devno, NULL },
{ 0 }
};
DEVICE mt_dev = {
"MT", mt_unit, mt_reg, mt_mod,
MT_NUMDR, 10, 31, 1, 8, 8,
NULL, NULL, &mt_reset,
NULL, &mt_attach, &mt_detach,
&mt_dib, DEV_DISABLE | DEV_DEBUG | DEV_TAPE
};
/* IOT routine */
int32 mt (int32 dev, int32 pulse, int32 dat)
{
int32 f, sb;
UNIT *uptr;
uptr = mt_dev.units + GET_UNIT (mt_cu); /* get unit */
mt_updcsta (uptr, 0); /* update status */
sb = pulse & 060; /* subop */
if (pulse & 01) {
if ((sb == 000) && (uptr->flags & UNIT_ATT) && /* MTTR */
!sim_is_active (uptr))
dat = IOT_SKP | dat;
else if ((sb == 020) && !mt_busy ()) /* MTCR */
dat = IOT_SKP | dat;
else if ((sb == 040) && (mt_sta & (STA_ERR | STA_DON))) /* MTSF */
dat = IOT_SKP | dat;
}
if ((pulse & 06) && DEBUG_PRS (mt_dev))
fprintf (sim_deb, "[MT%d: IOT=%o, AC=%o, sta=%o]\n",
GET_UNIT (mt_cu), 0707300 + pulse, dat, mt_sta);
if (pulse & 02) {
if (sb == 000) /* MTRC */
dat = dat | (mt_cu & 0777700);
else if (sb == 020) { /* MTAF, MTLC */
if (!mt_busy ()) /* if not busy, clr */
mt_cu = mt_sta = 0;
mt_sta = mt_sta & ~(STA_ERR | STA_DON); /* clear flags */
}
else if (sb == 040) dat = dat | mt_sta; /* MTRS */
}
if (pulse & 04) {
if (sb == 000) { /* MTGO */
f = GET_CMD (mt_cu); /* get function */
if (mt_busy () ||
sim_is_active (uptr) ||
(f == FN_NOP) ||
(((f == FN_SPACER) || (f == FN_REWIND)) && (uptr->USTAT & STA_BOT)) ||
(((f == FN_WRITE) || (f == FN_WREOF)) && sim_tape_wrp (uptr)) ||
((uptr->flags & UNIT_ATT) == 0))
mt_sta = mt_sta | STA_ILL | STA_ERR; /* set illegal op */
else {
if (f == FN_REWIND) /* rewind? */
uptr->USTAT = STA_REW;
else mt_sta = uptr->USTAT = 0; /* no, clear status */
sim_activate (uptr, mt_time); /* start io */
}
}
if (sb == 020) /* MTCM, MTLC */
mt_cu = (mt_cu & 0770700) | (dat & 0777700); /* load status */
}
mt_updcsta (mt_dev.units + GET_UNIT (mt_cu), 0); /* update status */
return dat;
}
/* Unit service
If rewind done, reposition to start of tape, set status
else, do operation, set done, interrupt
*/
t_stat mt_svc (UNIT *uptr)
{
int32 c, c1, c2, c3, f, i, p, u;
int32 wc, xma;
t_mtrlnt tbc, cbc;
t_bool passed_eot;
t_stat st, r = SCPE_OK;
u = (int32) (uptr - mt_dev.units); /* get unit number */
f = GET_CMD (mt_cu); /* get command */
wc = WC_SIZE - (M[MT_WC] & WC_MASK); /* word count is 12b */
if (uptr->USTAT & STA_REW) { /* rewind? */
sim_tape_rewind (uptr); /* rewind tape */
if (uptr->flags & UNIT_ATT)
uptr->USTAT = STA_BOT;
else uptr->USTAT = 0;
if (u == GET_UNIT (mt_cu))
mt_updcsta (uptr, STA_DON);
if (DEBUG_PRS (mt_dev))
fprintf (sim_deb, "[MT%d: rewind complete, sta=%o]\n", u, mt_sta);
return SCPE_OK;
}
if ((uptr->flags & UNIT_ATT) == 0) { /* if not attached */
mt_updcsta (uptr, STA_ILL); /* illegal operation */
return IORETURN (mt_stopioe, SCPE_UNATT);
}
passed_eot = sim_tape_eot (uptr); /* passed EOT? */
switch (f) { /* case on function */
case FN_READ: /* read */
case FN_CMPARE: /* read/compare */
st = sim_tape_rdrecf (uptr, mtxb, &tbc, MT_MAXFR); /* read rec */
if (st == MTSE_RECE) /* rec in err? */
mt_sta = mt_sta | STA_PAR | STA_ERR;
else if (st != MTSE_OK) { /* other error? */
mt_sta = mt_sta | STA_RLE | STA_ERR; /* set RLE flag */
r = mt_map_err (uptr, st); /* map error */
break;
}
cbc = PACKED (mt_cu)? wc * 3: wc * 2; /* expected bc */
if (tbc != cbc) /* wrong size? */
mt_sta = mt_sta | STA_RLE | STA_ERR;
if (tbc < cbc) { /* record small? */
cbc = tbc; /* use smaller */
wc = PACKED (mt_cu)? ((tbc + 2) / 3): ((tbc + 1) / 2);
}
for (i = p = 0; i < wc; i++) { /* copy buffer */
M[MT_WC] = (M[MT_WC] + 1) & DMASK; /* inc WC, CA */
M[MT_CA] = (M[MT_CA] + 1) & DMASK;
xma = M[MT_CA] & AMASK;
if (PACKED (mt_cu)) { /* packed? */
c1 = mtxb[p++] & 077;
c2 = mtxb[p++] & 077;
c3 = mtxb[p++] & 077;
c = (c1 << 12) | (c2 << 6) | c3;
}
else {
c1 = mtxb[p++];
c2 = mtxb[p++];
c = (c1 << 8) | c2;
}
if ((f == FN_READ) && MEM_ADDR_OK (xma))
M[xma] = c;
else if ((f == FN_CMPARE) && (c != (M[xma] &
(PACKED (mt_cu)? DMASK: 0177777)))) {
mt_updcsta (uptr, STA_CPE);
break;
}
} /* end for */
break;
case FN_WRITE: /* write */
tbc = PACKED (mt_cu)? wc * 3: wc * 2;
xma = M[MT_CA] & AMASK; /* get mem addr */
for (i = p = 0; i < wc; i++) { /* copy buf to tape */
xma = (xma + 1) & AMASK; /* incr mem addr */
if (PACKED (mt_cu)) { /* packed? */
mtxb[p++] = (M[xma] >> 12) & 077;
mtxb[p++] = (M[xma] >> 6) & 077;
mtxb[p++] = M[xma] & 077;
}
else {
mtxb[p++] = (M[xma] >> 8) & 0377;
mtxb[p++] = M[xma] & 0377;
}
} /* end for */
if ((st = sim_tape_wrrecf (uptr, mtxb, tbc))) /* write rec, err? */
r = mt_map_err (uptr, st); /* map error */
else {
M[MT_CA] = (M[MT_CA] + wc) & DMASK; /* advance mem addr */
M[MT_WC] = 0; /* clear word cnt */
}
mt_cu = mt_cu & ~CU_ERASE; /* clear erase flag */
break;
case FN_WREOF:
if ((st = sim_tape_wrtmk (uptr))) /* write tmk, err? */
r = mt_map_err (uptr, st); /* map error */
else uptr->USTAT = STA_EOF;
mt_cu = mt_cu & ~CU_ERASE; /* clear erase flag */
break;
case FN_SPACEF: /* space forward */
do {
M[MT_WC] = (M[MT_WC] + 1) & DMASK; /* inc WC */
if ((st = sim_tape_sprecf (uptr, &tbc))) { /* space rec fwd, err? */
r = mt_map_err (uptr, st); /* map error */
break;
}
} while ((M[MT_WC] != 0) && (passed_eot || !sim_tape_eot (uptr)));
break;
case FN_SPACER: /* space reverse */
do {
M[MT_WC] = (M[MT_WC] + 1) & DMASK; /* inc WC */
if ((st = sim_tape_sprecr (uptr, &tbc))) { /* space rec rev, err? */
r = mt_map_err (uptr, st); /* map error */
break;
}
} while (M[MT_WC] != 0);
break;
} /* end case */
if (!passed_eot && sim_tape_eot (uptr)) /* just passed EOT? */
uptr->USTAT = uptr->USTAT | STA_EOT;
mt_updcsta (uptr, STA_DON); /* set done */
if (DEBUG_PRS (mt_dev))
fprintf (sim_deb, "MT%d: fnc=%d done, ma=%o, wc=%o, sta=%o]\n",
u, f, M[MT_CA], M[MT_WC], mt_sta);
return r;
}
/* Update controller status */
int32 mt_updcsta (UNIT *uptr, int32 news)
{
mt_sta = (mt_sta & ~(STA_DYN | STA_CLR)) | (uptr->USTAT & STA_DYN) | news;
if ((mt_sta & (STA_ERR | STA_DON)) && (mt_cu & CU_IE))
SET_INT (MTA);
else CLR_INT (MTA); /* int request */
return mt_sta;
}
/* Test if controller busy */
UNIT *mt_busy (void)
{
int32 u;
UNIT *uptr;
for (u = 0; u < MT_NUMDR; u++) { /* loop thru units */
uptr = mt_dev.units + u;
if (sim_is_active (uptr) && ((uptr->USTAT & STA_REW) == 0))
return uptr;
}
return NULL;
}
/* Map tape error status */
t_stat mt_map_err (UNIT *uptr, t_stat st)
{
switch (st) {
case MTSE_FMT: /* illegal fmt */
case MTSE_UNATT: /* not attached */
mt_sta = mt_sta | STA_ILL | STA_ERR;
case MTSE_OK: /* no error */
return SCPE_IERR;
case MTSE_TMK: /* end of file */
uptr->USTAT = uptr->USTAT | STA_EOF; /* set EOF */
mt_sta = mt_sta | STA_ERR;
break;
case MTSE_IOERR: /* IO error */
mt_sta = mt_sta | STA_PAR | STA_ERR; /* set par err */
if (mt_stopioe)
return SCPE_IOERR;
break;
case MTSE_INVRL: /* invalid rec lnt */
mt_sta = mt_sta | STA_PAR | STA_ERR; /* set par err */
return SCPE_MTRLNT;
case MTSE_RECE: /* record in error */
mt_sta = mt_sta | STA_PAR | STA_ERR; /* set par err */
break;
case MTSE_EOM: /* end of medium */
mt_sta = mt_sta | STA_BAD | STA_ERR; /* set end tape */
break;
case MTSE_BOT: /* reverse into BOT */
uptr->USTAT = uptr->USTAT | STA_BOT; /* set status */
mt_sta = mt_sta | STA_ERR;
break;
case MTSE_WRP: /* write protect */
mt_sta = mt_sta | STA_ILL | STA_ERR; /* illegal operation */
break;
}
return SCPE_OK;
}
/* Reset routine */
t_stat mt_reset (DEVICE *dptr)
{
int32 u;
UNIT *uptr;
mt_cu = mt_sta = 0;
for (u = 0; u < MT_NUMDR; u++) { /* loop thru units */
uptr = mt_dev.units + u;
sim_tape_reset (uptr); /* reset tape */
sim_cancel (uptr); /* cancel activity */
if (uptr->flags & UNIT_ATT)
uptr->USTAT = STA_BOT;
else uptr->USTAT = 0;
}
mt_updcsta (&mt_unit[0], 0); /* update status */
if (mtxb == NULL)
mtxb = (uint8 *) calloc (MT_MAXFR, sizeof (uint8));
if (mtxb == NULL)
return SCPE_MEM;
return SCPE_OK;
}
/* IORS routine */
int32 mt_iors (void)
{
return (mt_sta & (STA_ERR | STA_DON))? IOS_MTA: 0;
}
/* Attach routine */
t_stat mt_attach (UNIT *uptr, CONST char *cptr)
{
t_stat r;
r = sim_tape_attach (uptr, cptr);
if (r != SCPE_OK)
return r;
uptr->USTAT = STA_BOT;
mt_updcsta (mt_dev.units + GET_UNIT (mt_cu), 0); /* update status */
return r;
}
/* Detach routine */
t_stat mt_detach (UNIT* uptr)
{
if (!(uptr->flags & UNIT_ATT)) /* attached? */
return SCPE_OK;
if (!sim_is_active (uptr))
uptr->USTAT = 0;
mt_updcsta (mt_dev.units + GET_UNIT (mt_cu), 0); /* update status */
return sim_tape_detach (uptr);
}
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