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Added Asynch I/O and Disk Support for various Disk formats

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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>
This commit is contained in:
Mark Pizzolato
2011-04-15 08:49:18 -07:00
parent 35eac703c3
commit 87c3e3452f
19 changed files with 5695 additions and 504 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
sim_tape.h
View File

@@ -23,6 +23,7 @@
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from Robert M Supnik.
05-Feb-11 MP Add Asynch I/O support
30-Aug-06 JDB Added erase gap support
14-Feb-06 RMS Added variable tape capacity
17-Dec-05 RMS Added write support for Paul Pierce 7b format
@@ -91,6 +92,14 @@ typedef uint16 t_tpclnt; /* magtape rec lnt */
#define MT_TST_PNU(u) ((u)->flags & MTUF_PNU)
#define MT_GET_FMT(u) (((u)->flags >> MTUF_V_FMT) & MTUF_M_FMT)
/* sim_tape_position Position Flags */
#define MTPOS_V_REW 3
#define MTPOS_M_REW (1u << MTPOS_V_REW) /* Rewind First */
#define MTPOS_V_REV 2
#define MTPOS_M_REV (1u << MTPOS_V_REV) /* Reverse Direction */
#define MTPOS_V_OBJ 1
#define MTPOS_M_OBJ (1u << MTPOS_V_OBJ) /* Objects vs Records/Files */
/* Return status codes */
#define MTSE_OK 0 /* no error */
@@ -104,19 +113,47 @@ typedef uint16 t_tpclnt; /* magtape rec lnt */
#define MTSE_RECE 8 /* error in record */
#define MTSE_WRP 9 /* write protected */
typedef void (*TAPE_PCALLBACK)(UNIT *unit, t_stat status);
/* Prototypes */
t_stat sim_tape_attach_ex (UNIT *uptr, char *cptr, uint32 dbit);
t_stat sim_tape_attach (UNIT *uptr, char *cptr);
t_stat sim_tape_detach (UNIT *uptr);
t_stat sim_tape_rdrecf (UNIT *uptr, uint8 *buf, t_mtrlnt *bc, t_mtrlnt max);
t_stat sim_tape_rdrecf_a (UNIT *uptr, uint8 *buf, t_mtrlnt *bc, t_mtrlnt max, TAPE_PCALLBACK callback);
t_stat sim_tape_rdrecr (UNIT *uptr, uint8 *buf, t_mtrlnt *bc, t_mtrlnt max);
t_stat sim_tape_rdrecr_a (UNIT *uptr, uint8 *buf, t_mtrlnt *bc, t_mtrlnt max, TAPE_PCALLBACK callback);
t_stat sim_tape_wrrecf (UNIT *uptr, uint8 *buf, t_mtrlnt bc);
t_stat sim_tape_wrrecf_a (UNIT *uptr, uint8 *buf, t_mtrlnt bc, TAPE_PCALLBACK callback);
t_stat sim_tape_wrtmk (UNIT *uptr);
t_stat sim_tape_wrtmk_a (UNIT *uptr, TAPE_PCALLBACK callback);
t_stat sim_tape_wreom (UNIT *uptr);
t_stat sim_tape_wreom_a (UNIT *uptr, TAPE_PCALLBACK callback);
t_stat sim_tape_wreomrw (UNIT *uptr);
t_stat sim_tape_wreomrw_a (UNIT *uptr, TAPE_PCALLBACK callback);
t_stat sim_tape_wrgap (UNIT *uptr, uint32 gaplen, uint32 bpi);
t_stat sim_tape_wrgap_a (UNIT *uptr, uint32 gaplen, uint32 bpi, TAPE_PCALLBACK callback);
t_stat sim_tape_sprecf (UNIT *uptr, t_mtrlnt *bc);
t_stat sim_tape_sprecf_a (UNIT *uptr, t_mtrlnt *bc, TAPE_PCALLBACK callback);
t_stat sim_tape_sprecsf (UNIT *uptr, uint32 count, uint32 *skipped);
t_stat sim_tape_sprecsf_a (UNIT *uptr, uint32 count, uint32 *skipped, TAPE_PCALLBACK callback);
t_stat sim_tape_spfilef (UNIT *uptr, uint32 count, uint32 *skipped);
t_stat sim_tape_spfilef_a (UNIT *uptr, uint32 count, uint32 *skipped, TAPE_PCALLBACK callback);
t_stat sim_tape_spfilebyrecf (UNIT *uptr, uint32 count, uint32 *skipped, uint32 *recsskipped);
t_stat sim_tape_spfilebyrecf_a (UNIT *uptr, uint32 count, uint32 *skipped, uint32 *recsskipped, TAPE_PCALLBACK callback);
t_stat sim_tape_sprecr (UNIT *uptr, t_mtrlnt *bc);
t_stat sim_tape_sprecr_a (UNIT *uptr, t_mtrlnt *bc, TAPE_PCALLBACK callback);
t_stat sim_tape_sprecsr (UNIT *uptr, uint32 count, uint32 *skipped);
t_stat sim_tape_sprecsr_a (UNIT *uptr, uint32 count, uint32 *skipped, TAPE_PCALLBACK callback);
t_stat sim_tape_spfiler (UNIT *uptr, uint32 count, uint32 *skipped);
t_stat sim_tape_spfiler_a (UNIT *uptr, uint32 count, uint32 *skipped, TAPE_PCALLBACK callback);
t_stat sim_tape_spfilebyrecr (UNIT *uptr, uint32 count, uint32 *skipped, uint32 *recsskipped);
t_stat sim_tape_spfilebyrecr_a (UNIT *uptr, uint32 count, uint32 *skipped, uint32 *recsskipped, TAPE_PCALLBACK callback);
t_stat sim_tape_rewind (UNIT *uptr);
t_stat sim_tape_rewind_a (UNIT *uptr, TAPE_PCALLBACK callback);
t_stat sim_tape_position (UNIT *uptr, uint8 flags, uint32 recs, uint32 *recskipped, uint32 files, uint32 *fileskipped, uint32 *objectsskipped);
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 sim_tape_reset (UNIT *uptr);
t_bool sim_tape_bot (UNIT *uptr);
t_bool sim_tape_wrp (UNIT *uptr);
@@ -125,5 +162,8 @@ t_stat sim_tape_set_fmt (UNIT *uptr, int32 val, char *cptr, void *desc);
t_stat sim_tape_show_fmt (FILE *st, UNIT *uptr, int32 val, void *desc);
t_stat sim_tape_set_capac (UNIT *uptr, int32 val, char *cptr, void *desc);
t_stat sim_tape_show_capac (FILE *st, UNIT *uptr, int32 val, void *desc);
t_stat sim_tape_set_asynch (UNIT *uptr, int latency);
t_stat sim_tape_clr_asynch (UNIT *uptr);
void sim_tape_data_trace (UNIT *uptr, const uint8 *data, size_t len, const char* txt, int detail, uint32 reason);
#endif