87c3e3452f
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>
169 lines
9.4 KiB
C
169 lines
9.4 KiB
C
/* sim_tape.h: simulator tape support library definitions
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Copyright (c) 1993-2008, Robert M Supnik
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of Robert M Supnik shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from Robert M Supnik.
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05-Feb-11 MP Add Asynch I/O support
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30-Aug-06 JDB Added erase gap support
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14-Feb-06 RMS Added variable tape capacity
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17-Dec-05 RMS Added write support for Paul Pierce 7b format
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02-May-05 RMS Added support for Paul Pierce 7b format
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*/
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#ifndef _SIM_TAPE_H_
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#define _SIM_TAPE_H_ 0
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/* SIMH/E11 tape format */
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typedef uint32 t_mtrlnt; /* magtape rec lnt */
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#define MTR_TMK 0x00000000 /* tape mark */
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#define MTR_EOM 0xFFFFFFFF /* end of medium */
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#define MTR_GAP 0xFFFFFFFE /* primary gap */
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#define MTR_FHGAP 0xFFFEFFFF /* fwd half gap (overwrite) */
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#define MTR_RHGAP 0xFFFF0000 /* rev half gap (overwrite) */
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#define MTR_M_RHGAP (~0x000080FF) /* range mask for rev gap */
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#define MTR_MAXLEN 0x00FFFFFF /* max len is 24b */
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#define MTR_ERF 0x80000000 /* error flag */
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#define MTR_F(x) ((x) & MTR_ERF) /* record error flg */
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#define MTR_L(x) ((x) & ~MTR_ERF) /* record length */
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/* TPC tape format */
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typedef uint16 t_tpclnt; /* magtape rec lnt */
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/* P7B tape format */
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#define P7B_SOR 0x80 /* start of record */
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#define P7B_PAR 0x40 /* parity */
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#define P7B_DATA 0x3F /* data */
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#define P7B_DPAR (P7B_PAR|P7B_DATA) /* data and parity */
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#define P7B_EOF 0x0F /* eof character */
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#define TPC_TMK 0x0000 /* tape mark */
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/* Unit flags */
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#define MTUF_V_PNU (UNIT_V_UF + 0) /* position not upd */
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#define MTUF_V_WLK (UNIT_V_UF + 1) /* write locked */
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#define MTUF_V_FMT (UNIT_V_UF + 2) /* tape file format */
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#define MTUF_W_FMT 3 /* 3b of formats */
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#define MTUF_N_FMT (1u << MTUF_W_FMT) /* number of formats */
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#define MTUF_M_FMT ((1u << MTUF_W_FMT) - 1)
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#define MTUF_F_STD 0 /* SIMH format */
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#define MTUF_F_E11 1 /* E11 format */
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#define MTUF_F_TPC 2 /* TPC format */
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#define MTUF_F_P7B 3 /* P7B format */
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#define MUTF_F_TDF 4 /* TDF format */
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#define MTUF_V_UF (MTUF_V_FMT + MTUF_W_FMT)
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#define MTUF_PNU (1u << MTUF_V_PNU)
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#define MTUF_WLK (1u << MTUF_V_WLK)
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#define MTUF_FMT (MTUF_M_FMT << MTUF_V_FMT)
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#define MTUF_WRP (MTUF_WLK | UNIT_RO)
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#define MT_F_STD (MTUF_F_STD << MTUF_V_FMT)
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#define MT_F_E11 (MTUF_F_E11 << MTUF_V_FMT)
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#define MT_F_TPC (MTUF_F_TPC << MTUF_V_FMT)
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#define MT_F_P7B (MTUF_F_P7B << MTUF_V_FMT)
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#define MT_F_TDF (MTUF_F_TDF << MTUF_V_FMT)
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#define MT_SET_PNU(u) (u)->flags = (u)->flags | MTUF_PNU
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#define MT_CLR_PNU(u) (u)->flags = (u)->flags & ~MTUF_PNU
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#define MT_TST_PNU(u) ((u)->flags & MTUF_PNU)
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#define MT_GET_FMT(u) (((u)->flags >> MTUF_V_FMT) & MTUF_M_FMT)
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/* sim_tape_position Position Flags */
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#define MTPOS_V_REW 3
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#define MTPOS_M_REW (1u << MTPOS_V_REW) /* Rewind First */
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#define MTPOS_V_REV 2
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#define MTPOS_M_REV (1u << MTPOS_V_REV) /* Reverse Direction */
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#define MTPOS_V_OBJ 1
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#define MTPOS_M_OBJ (1u << MTPOS_V_OBJ) /* Objects vs Records/Files */
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/* Return status codes */
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#define MTSE_OK 0 /* no error */
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#define MTSE_TMK 1 /* tape mark */
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#define MTSE_UNATT 2 /* unattached */
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#define MTSE_IOERR 3 /* IO error */
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#define MTSE_INVRL 4 /* invalid rec lnt */
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#define MTSE_FMT 5 /* invalid format */
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#define MTSE_BOT 6 /* beginning of tape */
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#define MTSE_EOM 7 /* end of medium */
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#define MTSE_RECE 8 /* error in record */
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#define MTSE_WRP 9 /* write protected */
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typedef void (*TAPE_PCALLBACK)(UNIT *unit, t_stat status);
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/* Prototypes */
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t_stat sim_tape_attach_ex (UNIT *uptr, char *cptr, uint32 dbit);
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t_stat sim_tape_attach (UNIT *uptr, char *cptr);
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t_stat sim_tape_detach (UNIT *uptr);
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t_stat sim_tape_rdrecf (UNIT *uptr, uint8 *buf, t_mtrlnt *bc, t_mtrlnt max);
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t_stat sim_tape_rdrecf_a (UNIT *uptr, uint8 *buf, t_mtrlnt *bc, t_mtrlnt max, TAPE_PCALLBACK callback);
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t_stat sim_tape_rdrecr (UNIT *uptr, uint8 *buf, t_mtrlnt *bc, t_mtrlnt max);
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t_stat sim_tape_rdrecr_a (UNIT *uptr, uint8 *buf, t_mtrlnt *bc, t_mtrlnt max, TAPE_PCALLBACK callback);
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t_stat sim_tape_wrrecf (UNIT *uptr, uint8 *buf, t_mtrlnt bc);
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t_stat sim_tape_wrrecf_a (UNIT *uptr, uint8 *buf, t_mtrlnt bc, TAPE_PCALLBACK callback);
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t_stat sim_tape_wrtmk (UNIT *uptr);
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t_stat sim_tape_wrtmk_a (UNIT *uptr, TAPE_PCALLBACK callback);
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t_stat sim_tape_wreom (UNIT *uptr);
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t_stat sim_tape_wreom_a (UNIT *uptr, TAPE_PCALLBACK callback);
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t_stat sim_tape_wreomrw (UNIT *uptr);
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t_stat sim_tape_wreomrw_a (UNIT *uptr, TAPE_PCALLBACK callback);
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t_stat sim_tape_wrgap (UNIT *uptr, uint32 gaplen, uint32 bpi);
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t_stat sim_tape_wrgap_a (UNIT *uptr, uint32 gaplen, uint32 bpi, TAPE_PCALLBACK callback);
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t_stat sim_tape_sprecf (UNIT *uptr, t_mtrlnt *bc);
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t_stat sim_tape_sprecf_a (UNIT *uptr, t_mtrlnt *bc, TAPE_PCALLBACK callback);
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t_stat sim_tape_sprecsf (UNIT *uptr, uint32 count, uint32 *skipped);
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t_stat sim_tape_sprecsf_a (UNIT *uptr, uint32 count, uint32 *skipped, TAPE_PCALLBACK callback);
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t_stat sim_tape_spfilef (UNIT *uptr, uint32 count, uint32 *skipped);
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t_stat sim_tape_spfilef_a (UNIT *uptr, uint32 count, uint32 *skipped, TAPE_PCALLBACK callback);
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t_stat sim_tape_spfilebyrecf (UNIT *uptr, uint32 count, uint32 *skipped, uint32 *recsskipped);
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t_stat sim_tape_spfilebyrecf_a (UNIT *uptr, uint32 count, uint32 *skipped, uint32 *recsskipped, TAPE_PCALLBACK callback);
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t_stat sim_tape_sprecr (UNIT *uptr, t_mtrlnt *bc);
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t_stat sim_tape_sprecr_a (UNIT *uptr, t_mtrlnt *bc, TAPE_PCALLBACK callback);
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t_stat sim_tape_sprecsr (UNIT *uptr, uint32 count, uint32 *skipped);
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t_stat sim_tape_sprecsr_a (UNIT *uptr, uint32 count, uint32 *skipped, TAPE_PCALLBACK callback);
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t_stat sim_tape_spfiler (UNIT *uptr, uint32 count, uint32 *skipped);
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t_stat sim_tape_spfiler_a (UNIT *uptr, uint32 count, uint32 *skipped, TAPE_PCALLBACK callback);
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t_stat sim_tape_spfilebyrecr (UNIT *uptr, uint32 count, uint32 *skipped, uint32 *recsskipped);
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t_stat sim_tape_spfilebyrecr_a (UNIT *uptr, uint32 count, uint32 *skipped, uint32 *recsskipped, TAPE_PCALLBACK callback);
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t_stat sim_tape_rewind (UNIT *uptr);
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t_stat sim_tape_rewind_a (UNIT *uptr, TAPE_PCALLBACK callback);
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t_stat sim_tape_position (UNIT *uptr, uint8 flags, uint32 recs, uint32 *recskipped, uint32 files, uint32 *fileskipped, uint32 *objectsskipped);
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t_stat sim_tape_position_a (UNIT *uptr, uint8 flags, uint32 recs, uint32 *recsskipped, uint32 files, uint32 *filesskipped, uint32 *objectsskipped, TAPE_PCALLBACK callback);
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t_stat sim_tape_reset (UNIT *uptr);
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t_bool sim_tape_bot (UNIT *uptr);
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t_bool sim_tape_wrp (UNIT *uptr);
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t_bool sim_tape_eot (UNIT *uptr);
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t_stat sim_tape_set_fmt (UNIT *uptr, int32 val, char *cptr, void *desc);
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t_stat sim_tape_show_fmt (FILE *st, UNIT *uptr, int32 val, void *desc);
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t_stat sim_tape_set_capac (UNIT *uptr, int32 val, char *cptr, void *desc);
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t_stat sim_tape_show_capac (FILE *st, UNIT *uptr, int32 val, void *desc);
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t_stat sim_tape_set_asynch (UNIT *uptr, int latency);
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t_stat sim_tape_clr_asynch (UNIT *uptr);
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void sim_tape_data_trace (UNIT *uptr, const uint8 *data, size_t len, const char* txt, int detail, uint32 reason);
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#endif
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