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simh-testsetgenerator/sim_tape.c
Mark Pizzolato 87c3e3452f Added Asynch I/O and Disk Support for various Disk formats 
I’ve always wanted to have the option to have simulated devices behave
more naturally with respect to I/O operations.  By more naturally I
mean that the current simulator model I/O is either polled (for asynchronous
things link Muxes and Network), or it is performed in the middle of some
instruction execution taking possibly many milliseconds (disk and/or tapes).
The existing model creates quite deterministic behavior which helps to debug
and understand issues, but it trades off potential instruction execution
while performing these I/O operations in between instruction execution.

To address this concept (while still retaining the potential advantages of
the original model), I’ve designed an Asynch I/O model extension for simh.
In order to flesh-out and debug this design, I’ve also refactored several
devices to utilize this capability.  Please read the attached
0readmeAsynchIO.txt file for concept details about the approach.

In order to make disk devices easy to implement (within or without the
AsynchIO framework), I’ve created a sim_disk.c  library which is modeled
on the sim_tape.c library to generalize disk I/O like tape I/O is
generalized in sim_tape.c.  This sim_disk.c library now provides that
natural place to implement support for various disk implementation formats
(just like sim_tape support several formats, and one day will be the place
to add direct physical tape access). The current sim_disk library provides
the framework for direct support of 3 different disk formats:
    1) standard simh disk format
    2) platform specific physical disk access
and 3) platform independent Virtual Disk format.
The Virtual Disk format is an implementation of the format described in
the ”Microsoft Virtual Hard Disk (VHD) Image Format Specification”.  The
VHD specification is available for anyone to implement under the "Microsoft
Open Specification Promise" described at
http://www.microsoft.com/interop/osp/default.mspx.
The VHD implementation includes support for:
    1) Fixed sized disks
    2) Dynamically expanding disks
and 3) Differencing Disks.
Dynamically expanding disks don’t change their “Virtual Size”, but they
don’t consume disk space on the containing storage until the virtual
sectors in the disk are actually written to (i.e. an RA81 or RA92 VHD
with a VMS installed on it may initially only contain 30+ MB of files,
and the resulting VHD will be 30+ MB).  The VHD format contains meta data
which describes the virtual device.  Amongst this meta data is the simh
device type which the VHD was originally created as.  This metadata is
therefore available whenever that VHD is attached to an emulated disk
device in the future so the device type & size can be automatically be
configured.

Sim_disk_attach is used by device emulations to attach a simh/vhd/raw
device to a simulated device.  The following simh command switches
are used by the sim_disk_attach API:

    -R          Attach Read Only.
    -E          Must Exist (if not specified an attempt to create the
                indicated virtual disk will be attempted).
    -F          Open the indicated disk container in a specific format
                (default is to autodetect VHD defaulting to simh if the
                indicated container is not a VHD).
    -X          When creating a VHD, create a fixed sized VHD (vs a
                Dynamically expanding one).
    -C          Create a VHD and copy its contents from another disk
                (simh, VHD, or RAW format).
    -D          Create a Differencing VHD (relative to an already
                existing VHD disk)

Examples:

    sim> show rq
    RQ, address=20001468-2000146B*, no vector, 4 units
      RQ0, 159MB, not attached, write enabled, RD54, autosize, SIMH format
      RQ1, 159MB, not attached, write enabled, RD54, autosize, SIMH format
      RQ2, 159MB, not attached, write enabled, RD54, autosize, SIMH format
      RQ3, 409KB, not attached, write enabled, RX50, autosize, SIMH format
    sim> atta rq0 RA81.vhd
    sim> show rq0
    RQ0, 456MB, attached to RA81.vhd, write enabled, RA81, autosize, VHD format
    sim> set rq2 ra92
    sim> att rq2 -f vhd RA92.vhd
    RQ2: creating new file
    sim> sho rq2
    RQ2, 1505MB, attached to RA92.vhd, write enabled, RA92, autosize, VHD format
    sim> ! dir RA92.vhd
     Volume in drive H is New Volume
     Volume Serial Number is F8DE-510C

     Directory of H:\Data

    04/14/2011  12:57 PM             5,120 RA92.vhd
                   1 File(s)          5,120 bytes
                   0 Dir(s)   3,074,412,544 bytes free
    sim> atta rq3 -c RA92-1.vhd RA92.vhd
    sim> atta rq3 -c RA92-1.vhd RA92.vhd
    RQ3: creating new virtual disk 'RA92-1.vhd'
    RQ3: Copied 1505MB.  99% complete.
    RQ3: Copied 1505MB. Done.
    sim> sh rq3
    RQ3, 1505MB, attached to RA92-1.vhd, write enabled, RA92, autosize, VHD format
    sim>  ! dir RA92*
     Volume in drive H is New Volume
     Volume Serial Number is F8DE-510C

     Directory of H:\Data

    04/14/2011  01:12 PM             5,120 RA92-1.vhd
    04/14/2011  12:58 PM             5,120 RA92.vhd
                   2 File(s)         10,240 bytes
                   0 Dir(s)   3,074,404,352 bytes free
    sim> sho rq2
    RQ2, 1505MB, not attached, write enabled, RA92, autosize, VHD format
    sim> set rq2 ra81
    sim> set rq2 noauto
    sim> sho rq2
    RQ2, 456MB, not attached, write enabled, RA81, noautosize, VHD format
    sim> set rq2 format=simh
    sim> sho rq2
    RQ2, 456MB, not attached, write enabled, RA81, noautosize, SIMH format
    sim> atta rq2 -c RA81-Copy.vhd VMS055.dsk
    RQ2: creating new virtual disk 'RA81-Copy.vhd'
    RQ2: Copied 456MB.  99% complete.
    RQ2: Copied 456MB. Done.
    sim> sho rq2
    RQ2, 456MB, attached to RA81-Copy.vhd, write enabled, RA81, noautosize, VHD format
    sim> det rq2
    sim> ! dir RA81-Copy.vhd
     Volume in drive H is New Volume
     Volume Serial Number is F8DE-510C

     Directory of H:\Data

    04/14/2011  01:22 PM       178,304,512 RA81-Copy.vhd
                   1 File(s)    178,304,512 bytes
                   0 Dir(s)   2,896,097,280 bytes free
    sim> ! dir VMS055.dsk
     Volume in drive H is New Volume
     Volume Serial Number is F8DE-510C

     Directory of H:\Data

    03/08/2011  01:42 PM       403,663,872 VMS055.dsk
                   1 File(s)    403,663,872 bytes
                   0 Dir(s)   2,896,097,280 bytes free
    sim>
2011-04-15 08:49:18 -07:00

1835 lines
66 KiB
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/* sim_tape.c: simulator tape support library
Copyright (c) 1993-2008, 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.
Ultimately, this will be a place to hide processing of various tape formats,
as well as OS-specific direct hardware access.
05-Feb-11 MP Refactored to prepare for SIM_ASYNC_IO support
Added higher level routines:
sim_tape_wreomrw - erase remainder of tape & rewind
sim_tape_sprecsf - skip records
sim_tape_spfilef - skip files
sim_tape_sprecsr - skip records rev
sim_tape_spfiler - skip files rev
sim_tape_position - general purpose position
These routines correspond to natural tape operations
and will align better when physical tape support is
included here.
08-Jun-08 JDB Fixed signed/unsigned warning in sim_tape_set_fmt
23-Jan-07 JDB Fixed backspace over gap at BOT
22-Jan-07 RMS Fixed bug in P7B format read reclnt rev (found by Rich Cornwell)
15-Dec-06 RMS Added support for small capacity tapes
30-Aug-06 JDB Added erase gap support
14-Feb-06 RMS Added variable tape capacity
23-Jan-06 JDB Fixed odd-byte-write problem in sim_tape_wrrecf
17-Dec-05 RMS Added write support for Paul Pierce 7b format
16-Aug-05 RMS Fixed C++ declaration and cast problems
02-May-05 RMS Added support for Pierce 7b format
28-Jul-04 RMS Fixed bug in writing error records (found by Dave Bryan)
RMS Fixed incorrect error codes (found by Dave Bryan)
05-Jan-04 RMS Revised for file I/O library
25-Apr-03 RMS Added extended file support
28-Mar-03 RMS Added E11 and TPC format support
Public routines:
sim_tape_attach attach tape unit
sim_tape_detach detach tape unit
sim_tape_rdrecf read tape record forward
sim_tape_rdrecr read tape record reverse
sim_tape_wrrecf write tape record forward
sim_tape_sprecf space tape record forward
sim_tape_sprecr space tape record reverse
sim_tape_wrtmk write tape mark
sim_tape_wreom erase remainder of tape
sim_tape_wreomrw erase remainder of tape & rewind
sim_tape_wrgap write erase gap
sim_tape_sprecsf space records forward
sim_tape_spfilef space files forward
sim_tape_sprecsr space records reverse
sim_tape_spfiler space files reverse
sim_tape_position generalized position
sim_tape_rewind rewind
sim_tape_reset reset unit
sim_tape_bot TRUE if at beginning of tape
sim_tape_eot TRUE if at or beyond end of tape
sim_tape_wrp TRUE if write protected
sim_tape_set_fmt set tape format
sim_tape_show_fmt show tape format
sim_tape_set_capac set tape capacity
sim_tape_show_capac show tape capacity
sim_tape_set_async enable asynchronous operation
sim_tape_clr_async disable asynchronous operation
*/
#include "sim_defs.h"
#include "sim_tape.h"
#include <ctype.h>
#if defined SIM_ASYNCH_IO
#include <pthread.h>
#endif
struct sim_tape_fmt {
char *name; /* name */
int32 uflags; /* unit flags */
t_addr bot; /* bot test */
};
static struct sim_tape_fmt fmts[MTUF_N_FMT] = {
{ "SIMH", 0, sizeof (t_mtrlnt) - 1 },
{ "E11", 0, sizeof (t_mtrlnt) - 1 },
{ "TPC", UNIT_RO, sizeof (t_tpclnt) - 1 },
{ "P7B", 0, 0 },
/* { "TPF", UNIT_RO, 0 }, */
{ NULL, 0, 0 }
};
extern int32 sim_switches;
t_stat sim_tape_ioerr (UNIT *uptr);
t_stat sim_tape_wrdata (UNIT *uptr, uint32 dat);
uint32 sim_tape_tpc_map (UNIT *uptr, t_addr *map);
t_addr sim_tape_tpc_fnd (UNIT *uptr, t_addr *map);
struct tape_context {
DEVICE *dptr; /* Device for unit (access to debug flags) */
uint32 dbit; /* debugging bit */
#if defined SIM_ASYNCH_IO
int asynch_io; /* Asynchronous Interrupt scheduling enabled */
int asynch_io_latency; /* instructions to delay pending interrupt */
pthread_mutex_t lock;
pthread_t io_thread; /* I/O Thread Id */
pthread_mutex_t io_lock;
pthread_cond_t io_cond;
int io_top;
uint8 *buf;
uint32 *bc;
uint32 *fc;
uint32 vbc;
uint32 max;
uint32 gaplen;
uint32 bpi;
uint32 *objupdate;
TAPE_PCALLBACK callback;
t_stat io_status;
#endif
};
#define tape_ctx up8 /* Field in Unit structure which points to the tape_context */
#if defined SIM_ASYNCH_IO
#define AIO_CALLSETUP \
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx; \
\
if ((!callback) || !ctx->asynch_io)
#define AIO_CALL(op, _buf, _bc, _fc, _max, _vbc, _gaplen, _bpi, _obj, _callback)\
if (1) { \
struct tape_context *ctx = \
(struct tape_context *)uptr->tape_ctx; \
\
\
sim_debug (ctx->dbit, ctx->dptr, \
"sim_tape AIO_CALL(op=%d, unit=%d)\n", op, uptr-ctx->dptr->units);\
\
if (ctx->callback) \
abort(); /* horrible mistake, stop */ \
ctx->io_top = op; \
ctx->buf = _buf; \
ctx->bc = _bc; \
ctx->fc = _fc; \
ctx->max = _max; \
ctx->vbc = _vbc; \
ctx->gaplen = _gaplen; \
ctx->bpi = _bpi; \
ctx->objupdate = _obj; \
ctx->callback = _callback; \
pthread_cond_signal (&ctx->io_cond); \
}
#define TOP_DONE 0 /* close */
#define TOP_RDRF 1 /* sim_tape_rdrecf_a */
#define TOP_RDRR 2 /* sim_tape_rdrecr_a */
#define TOP_WREC 3 /* sim_tape_wrrecf_a */
#define TOP_WTMK 4 /* sim_tape_wrtmk_a */
#define TOP_WEOM 5 /* sim_tape_wreom_a */
#define TOP_WEMR 6 /* sim_tape_wreomrw_a */
#define TOP_WGAP 7 /* sim_tape_wrgap_a */
#define TOP_SPRF 8 /* sim_tape_sprecf_a */
#define TOP_SRSF 9 /* sim_tape_sprecsf_a */
#define TOP_SPRR 10 /* sim_tape_sprecr_a */
#define TOP_SRSR 11 /* sim_tape_sprecsr_a */
#define TOP_SPFF 12 /* sim_tape_spfilef */
#define TOP_SFRF 13 /* sim_tape_spfilebyrecf */
#define TOP_SPFR 14 /* sim_tape_spfiler */
#define TOP_SFRR 15 /* sim_tape_spfilebyrecr */
#define TOP_RWND 16 /* sim_tape_rewind_a */
#define TOP_POSN 17 /* sim_tape_position_a */
static void *
_tape_io(void *arg)
{
UNIT* volatile uptr = (UNIT*)arg;
int sched_policy;
struct sched_param sched_priority;
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
/* Boost Priority for this I/O thread vs the CPU instruction execution
thread which in general won't be readily yielding the processor when
this thread needs to run */
pthread_getschedparam (pthread_self(), &sched_policy, &sched_priority);
++sched_priority.sched_priority;
pthread_setschedparam (pthread_self(), sched_policy, &sched_priority);
sim_debug (ctx->dbit, ctx->dptr, "_tape_io(unit=%d) starting\n", uptr-ctx->dptr->units);
pthread_mutex_lock (&ctx->io_lock);
while (1) {
pthread_cond_wait (&ctx->io_cond, &ctx->io_lock);
if (ctx->io_top == TOP_DONE)
break;
pthread_mutex_unlock (&ctx->io_lock);
switch (ctx->io_top) {
case TOP_RDRF:
ctx->io_status = sim_tape_rdrecf (uptr, ctx->buf, ctx->bc, ctx->max);
break;
case TOP_RDRR:
ctx->io_status = sim_tape_rdrecr (uptr, ctx->buf, ctx->bc, ctx->max);
break;
case TOP_WREC:
ctx->io_status = sim_tape_wrrecf (uptr, ctx->buf, ctx->vbc);
break;
case TOP_WTMK:
ctx->io_status = sim_tape_wrtmk (uptr);
break;
case TOP_WEOM:
ctx->io_status = sim_tape_wreom (uptr);
break;
case TOP_WEMR:
ctx->io_status = sim_tape_wreomrw (uptr);
break;
case TOP_WGAP:
ctx->io_status = sim_tape_wrgap (uptr, ctx->gaplen, ctx->bpi);
break;
case TOP_SPRF:
ctx->io_status = sim_tape_sprecf (uptr, ctx->bc);
break;
case TOP_SRSF:
ctx->io_status = sim_tape_sprecsf (uptr, ctx->vbc, ctx->bc);
break;
case TOP_SPRR:
ctx->io_status = sim_tape_sprecr (uptr, ctx->bc);
break;
case TOP_SRSR:
ctx->io_status = sim_tape_sprecsr (uptr, ctx->vbc, ctx->bc);
break;
case TOP_SPFF:
ctx->io_status = sim_tape_spfilef (uptr, ctx->vbc, ctx->bc);
break;
case TOP_SFRF:
ctx->io_status = sim_tape_spfilebyrecf (uptr, ctx->vbc, ctx->bc, ctx->fc);
break;
case TOP_SPFR:
ctx->io_status = sim_tape_spfiler (uptr, ctx->vbc, ctx->bc);
break;
case TOP_SFRR:
ctx->io_status = sim_tape_spfilebyrecr (uptr, ctx->vbc, ctx->bc, ctx->fc);
break;
case TOP_RWND:
ctx->io_status = sim_tape_rewind (uptr);
break;
case TOP_POSN:
ctx->io_status = sim_tape_position (uptr, ctx->vbc, ctx->gaplen, ctx->bc, ctx->bpi, ctx->fc, ctx->objupdate);
break;
}
pthread_mutex_lock (&ctx->io_lock);
ctx->io_top = TOP_DONE;
sim_activate (uptr, ctx->asynch_io_latency);
}
pthread_mutex_unlock (&ctx->io_lock);
sim_debug (ctx->dbit, ctx->dptr, "_tape_io(unit=%d) exiting\n", uptr-ctx->dptr->units);
return NULL;
}
/* This routine is called in the context of the main simulator thread before
processing events for any unit. It is only called when an asynchronous
thread has called sim_activate() to activate a unit. The job of this
routine is to put the unit in proper condition to digest what may have
occurred in the asynchrcondition thread.
Since tape processing only handles a single I/O at a time to a
particular tape device, we have the opportunity to possibly detect
improper attempts to issue multiple concurrent I/O requests. */
static void _tape_completion_dispatch (UNIT *uptr)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
TAPE_PCALLBACK callback = ctx->callback;
sim_debug (ctx->dbit, ctx->dptr, "_tape_completion_dispatch(unit=%d, top=%d, callback=%p)\n", uptr-ctx->dptr->units, ctx->io_top, ctx->callback);
if (ctx->io_top != TOP_DONE)
abort(); /* horribly wrong, stop */
if (ctx->callback && ctx->io_top == TOP_DONE) {
ctx->callback = NULL;
callback (uptr, ctx->io_status);
}
}
#else
#define AIO_CALLSETUP
#define AIO_CALL(op, _buf, _fc, _bc, _max, _vbc, _gaplen, _bpi, _obj, _callback) \
if (_callback) \
(_callback) (uptr, r);
#endif
/* Enable asynchronous operation */
t_stat sim_tape_set_async (UNIT *uptr, int latency)
{
#if !defined(SIM_ASYNCH_IO)
extern FILE *sim_log; /* log file */
char *msg = "Tape: can't operate asynchronously\r\n";
printf ("%s", msg);
if (sim_log) fprintf (sim_log, "%s", msg);
return SCPE_NOFNC;
#else
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
pthread_attr_t attr;
ctx->asynch_io = 1;
ctx->asynch_io_latency = latency;
pthread_mutex_init (&ctx->io_lock, NULL);
pthread_cond_init (&ctx->io_cond, NULL);
pthread_attr_init(&attr);
pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
pthread_create (&ctx->io_thread, &attr, _tape_io, (void *)uptr);
pthread_attr_destroy(&attr);
uptr->a_check_completion = _tape_completion_dispatch;
#endif
return SCPE_OK;
}
/* Disable asynchronous operation */
t_stat sim_tape_clr_async (UNIT *uptr)
{
#if !defined(SIM_ASYNCH_IO)
return SCPE_NOFNC;
#else
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
/* make sure device exists */
if (!ctx) return SCPE_UNATT;
if (ctx->asynch_io) {
pthread_mutex_lock (&ctx->io_lock);
ctx->asynch_io = 0;
pthread_cond_signal (&ctx->io_cond);
pthread_mutex_unlock (&ctx->io_lock);
pthread_join (ctx->io_thread, NULL);
pthread_mutex_destroy (&ctx->io_lock);
pthread_cond_destroy (&ctx->io_cond);
}
return SCPE_OK;
#endif
}
static void _sim_tape_io_flush (UNIT *uptr)
{
#if defined (SIM_ASYNCH_IO)
sim_tape_clr_async (uptr);
sim_tape_set_async (uptr, 0);
#endif
fflush (uptr->fileref);
}
/* Attach tape unit */
t_stat sim_tape_attach (UNIT *uptr, char *cptr)
{
return sim_tape_attach_ex (uptr, cptr, 0);
}
t_stat sim_tape_attach_ex (UNIT *uptr, char *cptr, uint32 dbit)
{
struct tape_context *ctx;
uint32 objc;
DEVICE *dptr;
char gbuf[CBUFSIZE];
t_stat r;
if ((dptr = find_dev_from_unit (uptr)) == NULL)
return SCPE_NOATT;
if (sim_switches & SWMASK ('F')) { /* format spec? */
cptr = get_glyph (cptr, gbuf, 0); /* get spec */
if (*cptr == 0) /* must be more */
return SCPE_2FARG;
if (sim_tape_set_fmt (uptr, 0, gbuf, NULL) != SCPE_OK)
return SCPE_ARG;
}
r = attach_unit (uptr, cptr); /* attach unit */
if (r != SCPE_OK) /* error? */
return r;
switch (MT_GET_FMT (uptr)) { /* case on format */
case MTUF_F_TPC: /* TPC */
objc = sim_tape_tpc_map (uptr, NULL); /* get # objects */
if (objc == 0) { /* tape empty? */
sim_tape_detach (uptr);
return SCPE_FMT; /* yes, complain */
}
uptr->filebuf = calloc (objc + 1, sizeof (t_addr));
if (uptr->filebuf == NULL) { /* map allocated? */
sim_tape_detach (uptr);
return SCPE_MEM; /* no, complain */
}
uptr->hwmark = objc + 1; /* save map size */
sim_tape_tpc_map (uptr, (t_addr *) uptr->filebuf); /* fill map */
break;
default:
break;
}
uptr->tape_ctx = ctx = (struct tape_context *)calloc(1, sizeof(struct tape_context));
ctx->dptr = dptr; /* save DEVICE pointer */
ctx->dbit = dbit; /* save debug bit */
sim_tape_rewind (uptr);
#if defined (SIM_ASYNCH_IO)
sim_tape_set_async (uptr, 0);
#endif
uptr->io_flush = _sim_tape_io_flush;
return SCPE_OK;
}
/* Detach tape unit */
t_stat sim_tape_detach (UNIT *uptr)
{
uint32 f = MT_GET_FMT (uptr);
t_stat r;
#if defined (SIM_ASYNCH_IO)
sim_tape_clr_async (uptr);
#endif
r = detach_unit (uptr); /* detach unit */
if (r != SCPE_OK)
return r;
switch (f) { /* case on format */
case MTUF_F_TPC: /* TPC */
if (uptr->filebuf) /* free map */
free (uptr->filebuf);
uptr->filebuf = NULL;
uptr->hwmark = 0;
break;
default:
break;
}
sim_tape_rewind (uptr);
free (uptr->tape_ctx);
uptr->tape_ctx = NULL;
uptr->io_flush = NULL;
return SCPE_OK;
}
void sim_tape_data_trace(UNIT *uptr, const uint8 *data, size_t len, const char* txt, int detail, uint32 reason)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
if (ctx->dptr->dctrl & reason) {
sim_debug (reason, ctx->dptr, "%s%d %s len: %08X\n", ctx->dptr->name, uptr-ctx->dptr->units, txt, len);
if (detail) {
size_t i, same, group, sidx, oidx;
char outbuf[80], strbuf[18];
static char hex[] = "0123456789ABCDEF";
for (i=same=0; i<len; i += 16) {
if ((i > 0) && (0 == memcmp (&data[i], &data[i-16], 16))) {
++same;
continue;
}
if (same > 0) {
sim_debug (reason, ctx->dptr, "%04X thru %04X same as above\n", i-(16*same), i-1);
same = 0;
}
group = (((len - i) > 16) ? 16 : (len - i));
for (sidx=oidx=0; sidx<group; ++sidx) {
outbuf[oidx++] = ' ';
outbuf[oidx++] = hex[(data[i+sidx]>>4)&0xf];
outbuf[oidx++] = hex[data[i+sidx]&0xf];
if (isprint (data[i+sidx]))
strbuf[sidx] = data[i+sidx];
else
strbuf[sidx] = '.';
}
outbuf[oidx] = '\0';
strbuf[sidx] = '\0';
sim_debug (reason, ctx->dptr, "%04X%-48s %s\n", i, outbuf, strbuf);
}
if (same > 0)
sim_debug (reason, ctx->dptr, "%04X thru %04X same as above\n", i-(16*same), len-1);
}
}
}
/* Read record length forward (internal routine)
Inputs:
uptr = pointer to tape unit
bc = pointer to returned record length
Outputs:
status = operation status
exit condition position
unit unattached unchanged
read error unchanged, PNU set
end of file/medium unchanged, PNU set
tape mark updated
data record updated, sim_fread will read record forward
See notes at "sim_tape_wrgap" regarding erase gap implementation.
*/
t_stat sim_tape_rdlntf (UNIT *uptr, t_mtrlnt *bc)
{
uint8 c;
t_bool all_eof;
uint32 f = MT_GET_FMT (uptr);
t_mtrlnt sbc;
t_tpclnt tpcbc;
MT_CLR_PNU (uptr);
if ((uptr->flags & UNIT_ATT) == 0) /* not attached? */
return MTSE_UNATT;
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* set tape pos */
switch (f) { /* switch on fmt */
case MTUF_F_STD: case MTUF_F_E11:
do {
sim_fread (bc, sizeof (t_mtrlnt), 1, uptr->fileref); /* read rec lnt */
sbc = MTR_L (*bc); /* save rec lnt */
if (ferror (uptr->fileref)) { /* error? */
MT_SET_PNU (uptr); /* pos not upd */
return sim_tape_ioerr (uptr);
}
if (feof (uptr->fileref) || (*bc == MTR_EOM)) { /* eof or eom? */
MT_SET_PNU (uptr); /* pos not upd */
return MTSE_EOM;
}
uptr->pos = uptr->pos + sizeof (t_mtrlnt); /* spc over rec lnt */
if (*bc == MTR_TMK) /* tape mark? */
return MTSE_TMK;
if (*bc == MTR_FHGAP) { /* half gap? */
uptr->pos = uptr->pos + sizeof (t_mtrlnt) / 2; /* half space fwd */
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* resync */
}
else if (*bc != MTR_GAP)
uptr->pos = uptr->pos + sizeof (t_mtrlnt) + /* spc over record */
((f == MTUF_F_STD)? ((sbc + 1) & ~1): sbc);
}
while ((*bc == MTR_GAP) || (*bc == MTR_FHGAP));
break;
case MTUF_F_TPC:
sim_fread (&tpcbc, sizeof (t_tpclnt), 1, uptr->fileref);
*bc = tpcbc; /* save rec lnt */
if (ferror (uptr->fileref)) { /* error? */
MT_SET_PNU (uptr); /* pos not upd */
return sim_tape_ioerr (uptr);
}
if (feof (uptr->fileref)) { /* eof? */
MT_SET_PNU (uptr); /* pos not upd */
return MTSE_EOM;
}
uptr->pos = uptr->pos + sizeof (t_tpclnt); /* spc over reclnt */
if (tpcbc == TPC_TMK) /* tape mark? */
return MTSE_TMK;
uptr->pos = uptr->pos + ((tpcbc + 1) & ~1); /* spc over record */
break;
case MTUF_F_P7B:
for (sbc = 0, all_eof = 1; ; sbc++) { /* loop thru record */
sim_fread (&c, sizeof (uint8), 1, uptr->fileref);
if (ferror (uptr->fileref)) { /* error? */
MT_SET_PNU (uptr); /* pos not upd */
return sim_tape_ioerr (uptr);
}
if (feof (uptr->fileref)) { /* eof? */
if (sbc == 0) /* no data? eom */
return MTSE_EOM;
break; /* treat like eor */
}
if ((sbc != 0) && (c & P7B_SOR)) /* next record? */
break;
if ((c & P7B_DPAR) != P7B_EOF)
all_eof = 0;
}
*bc = sbc; /* save rec lnt */
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* for read */
uptr->pos = uptr->pos + sbc; /* spc over record */
if (all_eof) /* tape mark? */
return MTSE_TMK;
break;
default:
return MTSE_FMT;
}
return MTSE_OK;
}
/* Read record length reverse (internal routine)
Inputs:
uptr = pointer to tape unit
bc = pointer to returned record length
Outputs:
status = operation status
exit condition position
unit unattached unchanged
beginning of tape unchanged
read error unchanged
end of file unchanged
end of medium updated
tape mark updated
data record updated, sim_fread will read record forward
See notes at "sim_tape_wrgap" regarding erase gap implementation.
*/
t_stat sim_tape_rdlntr (UNIT *uptr, t_mtrlnt *bc)
{
uint8 c;
t_bool all_eof;
uint32 f = MT_GET_FMT (uptr);
t_addr ppos;
t_mtrlnt sbc;
t_tpclnt tpcbc;
MT_CLR_PNU (uptr);
if ((uptr->flags & UNIT_ATT) == 0) /* not attached? */
return MTSE_UNATT;
if (sim_tape_bot (uptr)) /* at BOT? */
return MTSE_BOT;
switch (f) { /* switch on fmt */
case MTUF_F_STD: case MTUF_F_E11:
do {
sim_fseek (uptr->fileref, uptr->pos - sizeof (t_mtrlnt), SEEK_SET);
sim_fread (bc, sizeof (t_mtrlnt), 1, uptr->fileref); /* read rec lnt */
sbc = MTR_L (*bc);
if (ferror (uptr->fileref)) /* error? */
return sim_tape_ioerr (uptr);
if (feof (uptr->fileref)) /* eof? */
return MTSE_EOM;
uptr->pos = uptr->pos - sizeof (t_mtrlnt); /* spc over rec lnt */
if (*bc == MTR_EOM) /* eom? */
return MTSE_EOM;
if (*bc == MTR_TMK) /* tape mark? */
return MTSE_TMK;
if ((*bc & MTR_M_RHGAP) == MTR_RHGAP) { /* half gap? */
uptr->pos = uptr->pos + sizeof (t_mtrlnt) / 2; /* half space rev */
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* resync */
}
else if (*bc != MTR_GAP) {
uptr->pos = uptr->pos - sizeof (t_mtrlnt) - /* spc over record */
((f == MTUF_F_STD)? ((sbc + 1) & ~1): sbc);
sim_fseek (uptr->fileref, uptr->pos + sizeof (t_mtrlnt), SEEK_SET);
}
else if (sim_tape_bot (uptr)) /* backed into BOT? */
return MTSE_BOT;
}
while ((*bc == MTR_GAP) || (*bc == MTR_RHGAP));
break;
case MTUF_F_TPC:
ppos = sim_tape_tpc_fnd (uptr, (t_addr *) uptr->filebuf); /* find prev rec */
sim_fseek (uptr->fileref, ppos, SEEK_SET); /* position */
sim_fread (&tpcbc, sizeof (t_tpclnt), 1, uptr->fileref);
*bc = tpcbc; /* save rec lnt */
if (ferror (uptr->fileref)) /* error? */
return sim_tape_ioerr (uptr);
if (feof (uptr->fileref)) /* eof? */
return MTSE_EOM;
uptr->pos = ppos; /* spc over record */
if (*bc == MTR_TMK) /* tape mark? */
return MTSE_TMK;
sim_fseek (uptr->fileref, uptr->pos + sizeof (t_tpclnt), SEEK_SET);
break;
case MTUF_F_P7B:
for (sbc = 1, all_eof = 1; (t_addr) sbc <= uptr->pos ; sbc++) {
sim_fseek (uptr->fileref, uptr->pos - sbc, SEEK_SET);
sim_fread (&c, sizeof (uint8), 1, uptr->fileref);
if (ferror (uptr->fileref)) /* error? */
return sim_tape_ioerr (uptr);
if (feof (uptr->fileref)) /* eof? */
return MTSE_EOM;
if ((c & P7B_DPAR) != P7B_EOF)
all_eof = 0;
if (c & P7B_SOR) /* start of record? */
break;
}
uptr->pos = uptr->pos - sbc; /* update position */
*bc = sbc; /* save rec lnt */
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* for read */
if (all_eof) /* tape mark? */
return MTSE_TMK;
break;
default:
return MTSE_FMT;
}
return MTSE_OK;
}
/* Read record forward
Inputs:
uptr = pointer to tape unit
buf = pointer to buffer
bc = pointer to returned record length
max = maximum record size
Outputs:
status = operation status
exit condition position
unit unattached unchanged
read error unchanged, PNU set
end of file/medium unchanged, PNU set
invalid record unchanged, PNU set
tape mark updated
data record updated
data record error updated
*/
t_stat sim_tape_rdrecf (UNIT *uptr, uint8 *buf, t_mtrlnt *bc, t_mtrlnt max)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
uint32 f = MT_GET_FMT (uptr);
t_mtrlnt i, tbc, rbc;
t_addr opos;
t_stat st;
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_rdrecf(unit=%d, buf=%p, max=%d)\n", uptr-ctx->dptr->units, buf, max);
opos = uptr->pos; /* old position */
if (st = sim_tape_rdlntf (uptr, &tbc)) /* read rec lnt */
return st;
*bc = rbc = MTR_L (tbc); /* strip error flag */
if (rbc > max) { /* rec out of range? */
MT_SET_PNU (uptr);
uptr->pos = opos;
return MTSE_INVRL;
}
i = sim_fread (buf, sizeof (uint8), rbc, uptr->fileref);/* read record */
if (ferror (uptr->fileref)) { /* error? */
MT_SET_PNU (uptr);
uptr->pos = opos;
return sim_tape_ioerr (uptr);
}
for ( ; i < rbc; i++) /* fill with 0's */
buf[i] = 0;
if (f == MTUF_F_P7B) /* p7b? strip SOR */
buf[0] = buf[0] & P7B_DPAR;
return (MTR_F (tbc)? MTSE_RECE: MTSE_OK);
}
t_stat sim_tape_rdrecf_a (UNIT *uptr, uint8 *buf, t_mtrlnt *bc, t_mtrlnt max, TAPE_PCALLBACK callback)
{
t_stat r = SCPE_OK;
AIO_CALLSETUP
r = sim_tape_rdrecf (uptr, buf, bc, max);
AIO_CALL(TOP_RDRF, buf, bc, NULL, max, 0, 0, 0, NULL, callback);
return r;
}
/* Read record reverse
Inputs:
uptr = pointer to tape unit
buf = pointer to buffer
bc = pointer to returned record length
max = maximum record size
Outputs:
status = operation status
exit condition position
unit unattached unchanged
read error unchanged
end of file unchanged
end of medium updated
invalid record unchanged
tape mark updated
data record updated
data record error updated
*/
t_stat sim_tape_rdrecr (UNIT *uptr, uint8 *buf, t_mtrlnt *bc, t_mtrlnt max)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
uint32 f = MT_GET_FMT (uptr);
t_mtrlnt i, rbc, tbc;
t_stat st;
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_rdrecr(unit=%d, buf=%p, max=%d)\n", uptr-ctx->dptr->units, buf, max);
if (st = sim_tape_rdlntr (uptr, &tbc)) /* read rec lnt */
return st;
*bc = rbc = MTR_L (tbc); /* strip error flag */
if (rbc > max) /* rec out of range? */
return MTSE_INVRL;
i = sim_fread (buf, sizeof (uint8), rbc, uptr->fileref);/* read record */
if (ferror (uptr->fileref)) /* error? */
return sim_tape_ioerr (uptr);
for ( ; i < rbc; i++) /* fill with 0's */
buf[i] = 0;
if (f == MTUF_F_P7B) /* p7b? strip SOR */
buf[0] = buf[0] & P7B_DPAR;
return (MTR_F (tbc)? MTSE_RECE: MTSE_OK);
}
t_stat sim_tape_rdrecr_a (UNIT *uptr, uint8 *buf, t_mtrlnt *bc, t_mtrlnt max, TAPE_PCALLBACK callback)
{
t_stat r = SCPE_OK;
AIO_CALLSETUP
r = sim_tape_rdrecr (uptr, buf, bc, max);
AIO_CALL(TOP_RDRR, buf, bc, NULL, max, 0, 0, 0, NULL, callback);
return r;
}
/* Write record forward
Inputs:
uptr = pointer to tape unit
buf = pointer to buffer
bc = record length
Outputs:
status = operation status
exit condition position
unit unattached unchanged
write protect unchanged
write error unchanged, PNU set
data record updated
*/
t_stat sim_tape_wrrecf (UNIT *uptr, uint8 *buf, t_mtrlnt bc)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
uint32 f = MT_GET_FMT (uptr);
t_mtrlnt sbc;
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_wrrecf(unit=%d, buf=%p, bc=%d)\n", uptr-ctx->dptr->units, buf, bc);
MT_CLR_PNU (uptr);
sbc = MTR_L (bc);
if ((uptr->flags & UNIT_ATT) == 0) /* not attached? */
return MTSE_UNATT;
if (sim_tape_wrp (uptr)) /* write prot? */
return MTSE_WRP;
if (sbc == 0) /* nothing to do? */
return MTSE_OK;
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* set pos */
switch (f) { /* case on format */
case MTUF_F_STD: /* standard */
sbc = MTR_L ((bc + 1) & ~1); /* pad odd length */
case MTUF_F_E11: /* E11 */
sim_fwrite (&bc, sizeof (t_mtrlnt), 1, uptr->fileref);
sim_fwrite (buf, sizeof (uint8), sbc, uptr->fileref);
sim_fwrite (&bc, sizeof (t_mtrlnt), 1, uptr->fileref);
if (ferror (uptr->fileref)) { /* error? */
MT_SET_PNU (uptr);
return sim_tape_ioerr (uptr);
}
uptr->pos = uptr->pos + sbc + (2 * sizeof (t_mtrlnt)); /* move tape */
break;
case MTUF_F_P7B: /* Pierce 7B */
buf[0] = buf[0] | P7B_SOR; /* mark start of rec */
sim_fwrite (buf, sizeof (uint8), sbc, uptr->fileref);
sim_fwrite (buf, sizeof (uint8), 1, uptr->fileref); /* delimit rec */
if (ferror (uptr->fileref)) { /* error? */
MT_SET_PNU (uptr);
return sim_tape_ioerr (uptr);
}
uptr->pos = uptr->pos + sbc; /* move tape */
break;
}
return MTSE_OK;
}
t_stat sim_tape_wrrecf_a (UNIT *uptr, uint8 *buf, t_mtrlnt bc, TAPE_PCALLBACK callback)
{
t_stat r = SCPE_OK;
AIO_CALLSETUP
r = sim_tape_wrrecf (uptr, buf, bc);
AIO_CALL(TOP_WREC, buf, 0, NULL, 0, bc, 0, 0, NULL, callback);
return r;
}
/* Write metadata forward (internal routine) */
t_stat sim_tape_wrdata (UNIT *uptr, uint32 dat)
{
MT_CLR_PNU (uptr);
if ((uptr->flags & UNIT_ATT) == 0) /* not attached? */
return MTSE_UNATT;
if (sim_tape_wrp (uptr)) /* write prot? */
return MTSE_WRP;
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* set pos */
sim_fwrite (&dat, sizeof (t_mtrlnt), 1, uptr->fileref);
if (ferror (uptr->fileref)) { /* error? */
MT_SET_PNU (uptr);
return sim_tape_ioerr (uptr);
}
uptr->pos = uptr->pos + sizeof (t_mtrlnt); /* move tape */
return MTSE_OK;
}
/* Write tape mark */
t_stat sim_tape_wrtmk (UNIT *uptr)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_wrtmk(unit=%d)\n", uptr-ctx->dptr->units);
if (MT_GET_FMT (uptr) == MTUF_F_P7B) { /* P7B? */
uint8 buf = P7B_EOF; /* eof mark */
return sim_tape_wrrecf (uptr, &buf, 1); /* write char */
}
return sim_tape_wrdata (uptr, MTR_TMK);
}
t_stat sim_tape_wrtmk_a (UNIT *uptr, TAPE_PCALLBACK callback)
{
t_stat r = MTSE_OK;
AIO_CALLSETUP
r = sim_tape_wrtmk (uptr);
AIO_CALL(TOP_WTMK, NULL, NULL, NULL, 0, 0, 0, 0, NULL, callback);
return r;
}
/* Write end of medium */
t_stat sim_tape_wreom (UNIT *uptr)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_wreom(unit=%d)\n", uptr-ctx->dptr->units);
if (MT_GET_FMT (uptr) == MTUF_F_P7B) /* cant do P7B */
return MTSE_FMT;
return sim_tape_wrdata (uptr, MTR_EOM);
}
t_stat sim_tape_wreom_a (UNIT *uptr, TAPE_PCALLBACK callback)
{
t_stat r = MTSE_OK;
AIO_CALLSETUP
r = sim_tape_wreom (uptr);
AIO_CALL(TOP_WEOM, NULL, NULL, NULL, 0, 0, 0, 0, NULL, callback);
return r;
}
/* Write end of medium-rewind */
t_stat sim_tape_wreomrw (UNIT *uptr)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
t_stat r;
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_wreomrw(unit=%d)\n", uptr-ctx->dptr->units);
if (MT_GET_FMT (uptr) == MTUF_F_P7B) /* cant do P7B */
return MTSE_FMT;
r = sim_tape_wrdata (uptr, MTR_EOM);
if (r == MTSE_OK)
r = sim_tape_rewind (uptr);
return r;
}
t_stat sim_tape_wreomrw_a (UNIT *uptr, TAPE_PCALLBACK callback)
{
t_stat r = MTSE_OK;
AIO_CALLSETUP
r = sim_tape_wreomrw (uptr);
AIO_CALL(TOP_WEMR, NULL, NULL, NULL, 0, 0, 0, 0, NULL, callback);
return r;
}
/* Write erase gap
Inputs:
uptr = pointer to tape unit
gaplen = length of gap in tenths of an inch
bpi = current recording density in bytes per inch
Outputs:
status = operation status
exit condition position
------------------ ------------------
unit unattached unchanged
unsupported format unchanged
write protected unchanged
read error unchanged, PNU set
write error unchanged, PNU set
gap written updated
An erase gap is represented in the tape image file by a special metadata
value. This value is chosen so that it is still recognizable even if it has
been "cut in half" by a subsequent data overwrite that does not end on a
metadatum-sized boundary. In addition, a range of metadata values are
reserved for detection in the reverse direction. Erase gaps are supported
only in SIMH tape format.
This implementation supports erasing gaps in the middle of a populated tape
image and will always produce a valid image. It also produces valid images
when overwriting gaps with data records, with one exception: a data write
that leaves only two bytes of gap remaining will produce an invalid tape.
This limitation is deemed acceptable, as it is analogous to the existing
limitation that data records cannot overwrite other data records without
producing an invalid tape.
Because SIMH tape images do not carry physical parameters (e.g., recording
density), overwriting a tape image file containing gap metadata is
problematic if the density setting is not the same as that used during
recording. There is no way to establish a gap of a certain length
unequivocally in an image file, so this implementation establishes a gap of a
certain number of bytes that reflect the desired gap length at the bpi used
during writing.
To write an erase gap, the implementation uses one of two approaches,
depending on whether or not the current tape position is at EOM. Erasing at
EOM presents no special difficulties; gap metadata markers are written for
the prescribed number of bytes. If the tape is not at EOM, then erasing must
take into account the existing record structure to ensure that a valid tape
image is maintained.
The general approach is to erase for the nominal number of bytes but to
increase that length, if necessary, to ensure that a partially overwritten
data record at the end of the gap can be altered to maintain validity.
Because the smallest legal tape record requires space for two metadata
markers plus two data bytes, an erasure that would leave less than that
is increased to consume the entire record. Otherwise, the final record is
truncated appropriately.
When reading in either direction, gap metadata markers are ignored (skipped)
until a record length header, EOF marker, EOM marker, or physical EOF is
encountered. Thus, tape images containing gap metadata are transparent to
the calling simulator.
The permissibility of data record lengths that are not multiples of the
metadatum size presents a difficulty when reading. If such an "odd length"
record is written over a gap, half of a metadata marker will exist
immediately after the trailing record length.
This condition is detected when reading forward by the appearance of a
"reversed" marker. The value appears reversed because the value is made up
of half of one marker and half of the next. This is handled by seeking
forward two bytes to resync (the stipulation above that the overwrite cannot
leave only two bytes of gap means that at least one "whole" metadata marker
will follow). Reading in reverse presents a more complex problem, because
half of the marker is from the preceding trailing record length marker and
therefore could be any of a range of values. However, that range is
restricted by the SIMH tape specification requirement that record length
metadata values must have bits 30:24 set to zero. This allows unambiguous
detection of the condition.
The value chosen for gap metadata and the values reserved for "half-gap"
detection are:
0xFFFFFFFE - primary gap value
0xFFFEFFFF - reserved (indicates half-gap in forward reads)
0xFFFF0000:0xFFFF00FF - reserved (indicates half-gap in reverse reads)
0xFFFF8000:0xFFFF80FF - reserved (indicates half-gap in reverse reads)
*/
t_stat sim_tape_wrgap (UNIT *uptr, uint32 gaplen, uint32 bpi)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
t_stat st;
t_mtrlnt meta, sbc, new_len, rec_size;
t_addr gap_pos = uptr->pos;
uint32 file_size, marker_count;
uint32 format = MT_GET_FMT (uptr);
uint32 gap_alloc = 0; /* gap allocated from tape */
int32 gap_needed = (gaplen * bpi) / 10; /* gap remainder still needed */
const uint32 meta_size = sizeof (t_mtrlnt); /* bytes per metadatum */
const uint32 min_rec_size = 2 + sizeof (t_mtrlnt) * 2; /* smallest data record size */
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_wrgap(unit=%d, gaplen=%p, bpi=%d)\n", uptr-ctx->dptr->units, gaplen, bpi);
MT_CLR_PNU (uptr);
if ((uptr->flags & UNIT_ATT) == 0) /* not attached? */
return MTSE_UNATT;
if (format != MTUF_F_STD) /* not SIMH fmt? */
return MTSE_FMT;
if (sim_tape_wrp (uptr)) /* write protected? */
return MTSE_WRP;
file_size = sim_fsize (uptr->fileref); /* get file size */
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* position tape */
/* Read tape records and allocate to gap until amount required is consumed.
Read next metadatum from tape:
- EOF or EOM: allocate remainder of bytes needed.
- TMK or GAP: allocate sizeof(metadatum) bytes.
- Reverse GAP: allocate sizeof(metadatum) / 2 bytes.
- Data record: see below.
Loop until bytes needed = 0.
*/
do {
sim_fread (&meta, meta_size, 1, uptr->fileref); /* read metadatum */
if (ferror (uptr->fileref)) { /* read error? */
uptr->pos = gap_pos; /* restore original position */
MT_SET_PNU (uptr); /* position not updated */
return sim_tape_ioerr (uptr); /* translate error */
}
else
uptr->pos = uptr->pos + meta_size; /* move tape over datum */
if (feof (uptr->fileref) || (meta == MTR_EOM)) { /* at eof or eom? */
gap_alloc = gap_alloc + gap_needed; /* allocate remainder */
gap_needed = 0;
}
else if ((meta == MTR_GAP) || (meta == MTR_TMK)) { /* gap or tape mark? */
gap_alloc = gap_alloc + meta_size; /* allocate marker space */
gap_needed = gap_needed - meta_size; /* reduce requirement */
}
else if (meta == MTR_FHGAP) { /* half gap? */
uptr->pos = uptr->pos - meta_size / 2; /* backup to resync */
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* position tape */
gap_alloc = gap_alloc + meta_size / 2; /* allocate marker space */
gap_needed = gap_needed - meta_size / 2; /* reduce requirement */
}
else if (uptr->pos +
MTR_L (meta) + meta_size > file_size) { /* rec len out of range? */
gap_alloc = gap_alloc + gap_needed; /* presume overwritten tape */
gap_needed = 0; /* allocate remainder */
}
/* Allocate a data record:
- Determine record size in bytes (including metadata)
- If record size - bytes needed < smallest allowed record size,
allocate entire record to gap, else allocate needed amount and
truncate data record to reflect remainder.
*/
else { /* data record */
sbc = MTR_L (meta); /* get record data length */
rec_size = ((sbc + 1) & ~1) + meta_size * 2; /* overall size in bytes */
if (rec_size < gap_needed + min_rec_size) { /* rec too small? */
uptr->pos = uptr->pos - meta_size + rec_size; /* position past record */
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* move tape */
gap_alloc = gap_alloc + rec_size; /* allocate record */
gap_needed = gap_needed - rec_size; /* reduce requirement */
}
else { /* record size OK */
uptr->pos = uptr->pos - meta_size + gap_needed; /* position to end of gap */
new_len = MTR_F (meta) | (sbc - gap_needed); /* truncate to new len */
st = sim_tape_wrdata (uptr, new_len); /* write new rec len */
if (st != MTSE_OK) { /* write OK? */
uptr->pos = gap_pos; /* restore orig pos */
return st; /* PNU was set by wrdata */
}
uptr->pos = uptr->pos + sbc - gap_needed; /* position to end of data */
st = sim_tape_wrdata (uptr, new_len); /* write new rec len */
if (st != MTSE_OK) { /* write OK? */
uptr->pos = gap_pos; /* restore orig pos */
return st; /* PNU was set by wrdata */
}
gap_alloc = gap_alloc + gap_needed; /* allocate remainder */
gap_needed = 0;
}
}
}
while (gap_needed > 0);
uptr->pos = gap_pos; /* reposition to gap start */
if (gap_alloc & (meta_size - 1)) { /* gap size "odd?" */
st = sim_tape_wrdata (uptr, MTR_FHGAP); /* write half gap marker */
if (st != MTSE_OK) { /* write OK? */
uptr->pos = gap_pos; /* restore orig pos */
return st; /* PNU was set by wrdata */
}
uptr->pos = uptr->pos - meta_size / 2; /* realign position */
gap_alloc = gap_alloc - 2; /* decrease gap to write */
}
marker_count = gap_alloc / meta_size; /* count of gap markers */
do {
st = sim_tape_wrdata (uptr, MTR_GAP); /* write gap markers */
if (st != MTSE_OK) { /* write OK? */
uptr->pos = gap_pos; /* restore orig pos */
return st; /* PNU was set by wrdata */
}
}
while (--marker_count > 0);
return MTSE_OK;
}
t_stat sim_tape_wrgap_a (UNIT *uptr, uint32 gaplen, uint32 bpi, TAPE_PCALLBACK callback)
{
t_stat r = MTSE_OK;
AIO_CALLSETUP
r = sim_tape_wrgap (uptr, gaplen, bpi);
AIO_CALL(TOP_RDRR, NULL, NULL, NULL, 0, 0, gaplen, bpi, NULL, callback);
return r;
}
/* Space record forward
Inputs:
uptr = pointer to tape unit
bc = pointer to size of record skipped
Outputs:
status = operation status
exit condition position
unit unattached unchanged
read error unchanged, PNU set
end of file/medium unchanged, PNU set
tape mark updated
data record updated
data record error updated
*/
t_stat sim_tape_sprecf (UNIT *uptr, t_mtrlnt *bc)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
t_stat st;
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_sprecf(unit=%d)\n", uptr-ctx->dptr->units);
st = sim_tape_rdlntf (uptr, bc); /* get record length */
*bc = MTR_L (*bc);
return st;
}
t_stat sim_tape_sprecf_a (UNIT *uptr, t_mtrlnt *bc, TAPE_PCALLBACK callback)
{
t_stat r = MTSE_OK;
AIO_CALLSETUP
r = sim_tape_sprecf (uptr, bc);
AIO_CALL(TOP_SPRF, NULL, bc, NULL, 0, 0, 0, 0, NULL, callback);
return r;
}
/* Space records forward
Inputs:
uptr = pointer to tape unit
count = count of records to skip
skipped = pointer to number of records actually skipped
Outputs:
status = operation status
exit condition position
unit unattached unchanged
read error unchanged, PNU set
end of file/medium unchanged, PNU set
tape mark updated
data record updated
data record error updated
*/
t_stat sim_tape_sprecsf (UNIT *uptr, uint32 count, uint32 *skipped)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
t_stat st;
t_mtrlnt tbc;
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_sprecsf(unit=%d, count=%d)\n", uptr-ctx->dptr->units, count);
*skipped = 0;
while (*skipped < count) { /* loopo */
st = sim_tape_sprecf (uptr, &tbc); /* spc rec */
if (st != MTSE_OK)
return st;
*skipped = *skipped + 1; /* # recs skipped */
}
return MTSE_OK;
}
t_stat sim_tape_sprecsf_a (UNIT *uptr, uint32 count, uint32 *skipped, TAPE_PCALLBACK callback)
{
t_stat r = MTSE_OK;
AIO_CALLSETUP
r = sim_tape_sprecsf (uptr, count, skipped);
AIO_CALL(TOP_SRSF, NULL, skipped, NULL, 0, count, 0, 0, NULL, callback);
return r;
}
/* Space record reverse
Inputs:
uptr = pointer to tape unit
bc = pointer to size of records skipped
Outputs:
status = operation status
exit condition position
unit unattached unchanged
beginning of tape unchanged
read error unchanged
end of file unchanged
end of medium updated
tape mark updated
data record updated
*/
t_stat sim_tape_sprecr (UNIT *uptr, t_mtrlnt *bc)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
t_stat st;
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_sprecr(unit=%d)\n", uptr-ctx->dptr->units);
if (MT_TST_PNU (uptr)) {
MT_CLR_PNU (uptr);
*bc = 0;
return MTSE_OK;
}
st = sim_tape_rdlntr (uptr, bc); /* get record length */
*bc = MTR_L (*bc);
return st;
}
t_stat sim_tape_sprecr_a (UNIT *uptr, t_mtrlnt *bc, TAPE_PCALLBACK callback)
{
t_stat r = MTSE_OK;
AIO_CALLSETUP
r = sim_tape_sprecr (uptr, bc);
AIO_CALL(TOP_SPRR, NULL, bc, NULL, 0, 0, 0, 0, NULL, callback);
return r;
}
/* Space records reverse
Inputs:
uptr = pointer to tape unit
count = count of records to skip
skipped = pointer to number of records actually skipped
Outputs:
status = operation status
exit condition position
unit unattached unchanged
beginning of tape unchanged
read error unchanged
end of file unchanged
end of medium updated
tape mark updated
data record updated
*/
t_stat sim_tape_sprecsr (UNIT *uptr, uint32 count, uint32 *skipped)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
t_stat st;
t_mtrlnt tbc;
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_sprecsr(unit=%d, count=%d)\n", uptr-ctx->dptr->units, count);
*skipped = 0;
while (*skipped < count) { /* loopo */
st = sim_tape_sprecr (uptr, &tbc); /* spc rec rev */
if (st != MTSE_OK)
return st;
*skipped = *skipped + 1; /* # recs skipped */
}
return MTSE_OK;
}
t_stat sim_tape_sprecsr_a (UNIT *uptr, uint32 count, uint32 *skipped, TAPE_PCALLBACK callback)
{
t_stat r = MTSE_OK;
AIO_CALLSETUP
r = sim_tape_sprecsr (uptr, count, skipped);
AIO_CALL(TOP_SRSR, NULL, skipped, NULL, 0, count, 0, 0, NULL, callback);
return r;
}
/* Space files forward by record
Inputs:
uptr = pointer to tape unit
count = count of files to skip
skipped = pointer to number of files actually skipped
recsskipped = pointer to number of records skipped
Outputs:
status = operation status
exit condition position
unit unattached unchanged
read error unchanged, PNU set
end of file/medium unchanged, PNU set
tape mark updated
data record updated
data record error updated
*/
t_stat sim_tape_spfilebyrecf (UNIT *uptr, uint32 count, uint32 *skipped, uint32 *recsskipped)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
t_stat st;
uint32 filerecsskipped;
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_spfilebyrecf(unit=%d, count=%d)\n", uptr-ctx->dptr->units, count);
*skipped = 0;
*recsskipped = 0;
while (*skipped < count) { /* loopo */
while (1) {
st = sim_tape_sprecsf (uptr, 0x1ffffff, &filerecsskipped);/* spc recs */
*recsskipped += filerecsskipped;
if (st != MTSE_OK)
break;
}
if (st == MTSE_TMK)
*skipped = *skipped + 1; /* # files skipped */
else
return st;
}
return MTSE_OK;
}
t_stat sim_tape_spfilebyrecf_a (UNIT *uptr, uint32 count, uint32 *skipped, uint32 *recsskipped, TAPE_PCALLBACK callback)
{
t_stat r = MTSE_OK;
AIO_CALLSETUP
r = sim_tape_spfilebyrecf (uptr, count, skipped, recsskipped);
AIO_CALL(TOP_SPFF, NULL, skipped, recsskipped, 0, count, 0, 0, NULL, callback);
return r;
}
/* Space files forward
Inputs:
uptr = pointer to tape unit
count = count of files to skip
skipped = pointer to number of files actually skipped
Outputs:
status = operation status
exit condition position
unit unattached unchanged
read error unchanged, PNU set
end of file/medium unchanged, PNU set
tape mark updated
data record updated
data record error updated
*/
t_stat sim_tape_spfilef (UNIT *uptr, uint32 count, uint32 *skipped)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
uint32 totalrecsskipped;
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_spfilef(unit=%d, count=%d)\n", uptr-ctx->dptr->units, count);
return sim_tape_spfilebyrecf (uptr, count, skipped, &totalrecsskipped);
}
t_stat sim_tape_spfilef_a (UNIT *uptr, uint32 count, uint32 *skipped, TAPE_PCALLBACK callback)
{
t_stat r = MTSE_OK;
AIO_CALLSETUP
r = sim_tape_spfilef (uptr, count, skipped);
AIO_CALL(TOP_SPFF, NULL, skipped, NULL, 0, count, 0, 0, NULL, callback);
return r;
}
/* Space files reverse by record
Inputs:
uptr = pointer to tape unit
count = count of files to skip
skipped = pointer to number of files actually skipped
recsskipped = pointer to number of records skipped
Outputs:
status = operation status
exit condition position
unit unattached unchanged
beginning of tape unchanged
read error unchanged
end of file unchanged
end of medium updated
tape mark updated
data record updated
*/
t_stat sim_tape_spfilebyrecr (UNIT *uptr, uint32 count, uint32 *skipped, uint32 *recsskipped)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
t_stat st;
uint32 filerecsskipped;
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_spfilebyrecr(unit=%d, count=%d)\n", uptr-ctx->dptr->units, count);
*skipped = 0;
*recsskipped = 0;
while (*skipped < count) { /* loopo */
while (1) {
st = sim_tape_sprecsr (uptr, 0x1ffffff, &filerecsskipped);/* spc recs rev */
*recsskipped += filerecsskipped;
if (st != MTSE_OK)
break;
}
if (st == MTSE_TMK)
*skipped = *skipped + 1; /* # files skipped */
else
return st;
}
return MTSE_OK;
}
t_stat sim_tape_spfilebyrecr_a (UNIT *uptr, uint32 count, uint32 *skipped, uint32 *recsskipped, TAPE_PCALLBACK callback)
{
t_stat r = MTSE_OK;
AIO_CALLSETUP
r = sim_tape_spfilebyrecr (uptr, count, skipped, recsskipped);
AIO_CALL(TOP_SPFR, NULL, skipped, recsskipped, 0, count, 0, 0, NULL, callback);
return r;
}
/* Space files reverse
Inputs:
uptr = pointer to tape unit
count = count of files to skip
skipped = pointer to number of files actually skipped
Outputs:
status = operation status
exit condition position
unit unattached unchanged
beginning of tape unchanged
read error unchanged
end of file unchanged
end of medium updated
tape mark updated
data record updated
*/
t_stat sim_tape_spfiler (UNIT *uptr, uint32 count, uint32 *skipped)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
uint32 totalrecsskipped;
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_spfiler(unit=%d, count=%d)\n", uptr-ctx->dptr->units, count);
return sim_tape_spfilebyrecr (uptr, count, skipped, &totalrecsskipped);
}
t_stat sim_tape_spfiler_a (UNIT *uptr, uint32 count, uint32 *skipped, TAPE_PCALLBACK callback)
{
t_stat r = MTSE_OK;
AIO_CALLSETUP
r = sim_tape_spfiler (uptr, count, skipped);
AIO_CALL(TOP_SPFR, NULL, skipped, NULL, 0, count, 0, 0, NULL, callback);
return r;
}
/* Rewind tape */
t_stat sim_tape_rewind (UNIT *uptr)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
if (uptr->flags & UNIT_ATT)
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_rewind(unit=%d)\n", uptr-ctx->dptr->units);
uptr->pos = 0;
MT_CLR_PNU (uptr);
return MTSE_OK;
}
t_stat sim_tape_rewind_a (UNIT *uptr, TAPE_PCALLBACK callback)
{
t_stat r = MTSE_OK;
AIO_CALLSETUP
r = sim_tape_rewind (uptr);
AIO_CALL(TOP_RWND, NULL, NULL, NULL, 0, 0, 0, 0, NULL, callback);
return r;
}
/* Position Tape */
t_stat sim_tape_position (UNIT *uptr, uint8 flags, uint32 recs, uint32 *recsskipped, uint32 files, uint32 *filesskipped, uint32 *objectsskipped)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
t_stat r = MTSE_OK;
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_position(unit=%d, flags=0x%X, recs=%d, files=%d)\n", uptr-ctx->dptr->units, flags, recs, files);
*recsskipped = *filesskipped = *objectsskipped = 0;
if (flags & MTPOS_M_REW)
r = sim_tape_rewind (uptr);
if (r != MTSE_OK)
return r;
if (flags & MTPOS_M_OBJ) {
uint32 objs = recs;
uint32 skipped;
uint32 objsremaining = objs;
while (*objectsskipped < objs) { /* loopo */
if (flags & MTPOS_M_REV) /* reverse? */
r = sim_tape_sprecsr (uptr, objsremaining, &skipped);
else
r = sim_tape_sprecsf (uptr, objsremaining, &skipped);
objsremaining = objsremaining - (skipped + ((r == MTSE_TMK) ? 1 : 0));
if ((r == MTSE_TMK) || (r == MTSE_OK))
*objectsskipped = *objectsskipped + skipped + ((r == MTSE_TMK) ? 1 : 0);
else
return r;
}
r = MTSE_OK;
}
else {
uint32 fileskiprecs;
if (flags & MTPOS_M_REV) /* reverse? */
r = sim_tape_spfilebyrecr (uptr, files, filesskipped, &fileskiprecs);
else
r = sim_tape_spfilebyrecf (uptr, files, filesskipped, &fileskiprecs);
if (r != MTSE_OK)
return r;
if (flags & MTPOS_M_REV) /* reverse? */
r = sim_tape_sprecsr (uptr, recs, recsskipped);
else
r = sim_tape_sprecsf (uptr, recs, recsskipped);
if (r == MTSE_TMK)
*filesskipped = *filesskipped + 1;
*objectsskipped = fileskiprecs + *filesskipped + *recsskipped;
}
return r;
}
t_stat sim_tape_position_a (UNIT *uptr, uint8 flags, uint32 recs, uint32 *recsskipped, uint32 files, uint32 *filesskipped, uint32 *objectsskipped, TAPE_PCALLBACK callback)
{
t_stat r = MTSE_OK;
AIO_CALLSETUP
r = sim_tape_position (uptr, flags, recs, recsskipped, files, filesskipped, objectsskipped);
AIO_CALL(TOP_POSN, NULL, recsskipped, filesskipped, 0, flags, recs, files, objectsskipped, callback);
return r;
}
/* Reset tape */
t_stat sim_tape_reset (UNIT *uptr)
{
MT_CLR_PNU (uptr);
return SCPE_OK;
}
/* Test for BOT */
t_bool sim_tape_bot (UNIT *uptr)
{
uint32 f = MT_GET_FMT (uptr);
return (uptr->pos <= fmts[f].bot)? TRUE: FALSE;
}
/* Test for end of tape */
t_bool sim_tape_eot (UNIT *uptr)
{
return (uptr->capac && (uptr->pos >= uptr->capac))? TRUE: FALSE;
}
/* Test for write protect */
t_bool sim_tape_wrp (UNIT *uptr)
{
return (uptr->flags & MTUF_WRP)? TRUE: FALSE;
}
/* Process I/O error */
t_stat sim_tape_ioerr (UNIT *uptr)
{
perror ("Magtape library I/O error");
clearerr (uptr->fileref);
return MTSE_IOERR;
}
/* Set tape format */
t_stat sim_tape_set_fmt (UNIT *uptr, int32 val, char *cptr, void *desc)
{
uint32 f;
if (uptr == NULL)
return SCPE_IERR;
if (cptr == NULL)
return SCPE_ARG;
for (f = 0; f < MTUF_N_FMT; f++) {
if (fmts[f].name && (strcmp (cptr, fmts[f].name) == 0)) {
uptr->flags = (uptr->flags & ~MTUF_FMT) |
(f << MTUF_V_FMT) | fmts[f].uflags;
return SCPE_OK;
}
}
return SCPE_ARG;
}
/* Show tape format */
t_stat sim_tape_show_fmt (FILE *st, UNIT *uptr, int32 val, void *desc)
{
int32 f = MT_GET_FMT (uptr);
if (fmts[f].name)
fprintf (st, "%s format", fmts[f].name);
else fprintf (st, "invalid format");
return SCPE_OK;
}
/* Map a TPC format tape image */
uint32 sim_tape_tpc_map (UNIT *uptr, t_addr *map)
{
t_addr tpos;
t_tpclnt bc;
uint32 i, objc;
if ((uptr == NULL) || (uptr->fileref == NULL))
return 0;
for (objc = 0, tpos = 0;; ) {
sim_fseek (uptr->fileref, tpos, SEEK_SET);
i = sim_fread (&bc, sizeof (t_tpclnt), 1, uptr->fileref);
if (i == 0)
break;
if (map)
map[objc] = tpos;
objc++;
tpos = tpos + ((bc + 1) & ~1) + sizeof (t_tpclnt);
}
if (map) map[objc] = tpos;
return objc;
}
/* Find the preceding record in a TPC file */
t_addr sim_tape_tpc_fnd (UNIT *uptr, t_addr *map)
{
uint32 lo, hi, p;
if (map == NULL)
return 0;
lo = 0;
hi = uptr->hwmark - 1;
do {
p = (lo + hi) >> 1;
if (uptr->pos == map[p])
return ((p == 0)? map[p]: map[p - 1]);
else if (uptr->pos < map[p])
hi = p - 1;
else lo = p + 1;
}
while (lo <= hi);
return ((p == 0)? map[p]: map[p - 1]);
}
/* Set tape capacity */
t_stat sim_tape_set_capac (UNIT *uptr, int32 val, char *cptr, void *desc)
{
extern uint32 sim_taddr_64;
t_addr cap;
t_stat r;
if ((cptr == NULL) || (*cptr == 0))
return SCPE_ARG;
if (uptr->flags & UNIT_ATT)
return SCPE_ALATT;
cap = (t_addr) get_uint (cptr, 10, sim_taddr_64? 2000000: 2000, &r);
if (r != SCPE_OK)
return SCPE_ARG;
uptr->capac = cap * ((t_addr) 1000000);
return SCPE_OK;
}
/* Show tape capacity */
t_stat sim_tape_show_capac (FILE *st, UNIT *uptr, int32 val, void *desc)
{
if (uptr->capac) {
if (uptr->capac >= (t_addr) 1000000)
fprintf (st, "capacity=%dMB", (uint32) (uptr->capac / ((t_addr) 1000000)));
else if (uptr->capac >= (t_addr) 1000)
fprintf (st, "capacity=%dKB", (uint32) (uptr->capac / ((t_addr) 1000)));
else fprintf (st, "capacity=%dB", (uint32) uptr->capac);
}
else fprintf (st, "unlimited capacity");
return SCPE_OK;
}
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