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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>
This commit is contained in:
Mark Pizzolato
@@ -27,6 +27,8 @@
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sbi bus controller
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04-Feb-2011 MP Added RQB, RQC and RQD as bootable controllers
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07-Jan-2011 MP Implemented reboot functionality in the console emulator
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31-May-2008 RMS Fixed machine_check calling sequence (found by Peter Schorn)
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03-May-2006 RMS Fixed writes to ACCS
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28-May-08 RMS Inlined physical memory routines
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@@ -109,6 +111,9 @@ static struct boot_dev boot_tab[] = {
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{ "HK", BOOT_HK, 0 },
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{ "RL", BOOT_RL, 0 },
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{ "RQ", BOOT_UDA, 1 << 24 },
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{ "RQB", BOOT_UDA, 1 << 24 },
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{ "RQC", BOOT_UDA, 1 << 24 },
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{ "RQD", BOOT_UDA, 1 << 24 },
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{ "TQ", BOOT_TK, 1 << 24 },
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{ NULL }
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};
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@@ -152,6 +157,7 @@ extern void init_mbus_tab (void);
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extern void init_ubus_tab (void);
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extern t_stat build_mbus_tab (DEVICE *dptr, DIB *dibp);
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extern t_stat build_ubus_tab (DEVICE *dptr, DIB *dibp);
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extern DEVICE cpu_dev;
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/* SBI data structures
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@@ -162,6 +168,8 @@ extern t_stat build_ubus_tab (DEVICE *dptr, DIB *dibp);
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UNIT sbi_unit = { UDATA (NULL, 0, 0) };
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char cpu_boot_command[64];
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REG sbi_reg[] = {
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{ HRDATA (NREQ14, nexus_req[0], 16) },
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{ HRDATA (NREQ15, nexus_req[1], 16) },
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@@ -175,6 +183,7 @@ REG sbi_reg[] = {
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{ HRDATA (SBIMT, sbi_mt, 32) },
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{ HRDATA (SBIER, sbi_er, 32) },
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{ HRDATA (SBITMO, sbi_tmo, 32) },
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{ BRDATA (BOOTCMD, cpu_boot_command, 16, 8, sizeof(cpu_boot_command)), REG_HRO },
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{ NULL }
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};
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@@ -587,14 +596,6 @@ sbi_er = sbi_er & ~SBIER_TMOW1C; /* clr SBIER<tmo> etc */
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return cc;
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}
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/* Console entry */
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int32 con_halt (int32 code, int32 cc)
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{
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ABORT (STOP_HALT);
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return cc;
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}
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/* Special boot command - linked into SCP by initial reset
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Syntax: BOOT <device>{/R5:val}
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@@ -602,7 +603,7 @@ return cc;
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Sets up R0-R5, calls SCP boot processor with effective BOOT CPU
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*/
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t_stat vax780_boot (int32 flag, char *ptr)
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t_stat vax780_boot_parse (int32 flag, char *ptr)
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{
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char gbuf[CBUFSIZE];
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char *slptr, *regptr;
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@@ -649,12 +650,23 @@ for (i = 0; boot_tab[i].name != NULL; i++) {
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R[3] = unitno;
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R[4] = 0;
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R[5] = r5v;
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return run_cmd (flag, "CPU");
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strncpy(cpu_boot_command, ptr, sizeof(cpu_boot_command)-1);
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return SCPE_OK;
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}
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}
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return SCPE_NOFNC;
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}
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t_stat vax780_boot (int32 flag, char *ptr)
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{
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t_stat r;
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r = vax780_boot_parse (flag, ptr);
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if (r == SCPE_OK)
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return run_cmd (flag, "CPU");
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return r;
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}
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/* Bootstrap - finish up bootstrap process */
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t_stat cpu_boot (int32 unitno, DEVICE *dptr)
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@@ -671,6 +683,21 @@ SP = PC = 512;
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return SCPE_OK;
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}
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/* Console entry/Reboot */
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int32 con_halt (int32 code, int32 cc)
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{
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t_stat r;
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printf ("Reboot Requested ... Rebooting\n");
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if (sim_log) fprintf (sim_log,
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"Reboot Requested ... Rebooting\n");
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reset_all (0);
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r = vax780_boot_parse (4, cpu_boot_command);
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if (r == SCPE_OK) r = cpu_boot (0, &cpu_dev);
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return r;
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}
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/* SBI reset */
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t_stat sbi_reset (DEVICE *dptr)
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@@ -284,6 +284,10 @@ REG clk_reg[] = {
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{ DRDATA (TODR, todr_reg, 32), PV_LEFT },
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{ DRDATA (TIME, clk_unit.wait, 24), REG_NZ + PV_LEFT },
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{ DRDATA (TPS, clk_tps, 8), REG_HIDDEN + REG_NZ + PV_LEFT },
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#if defined (SIM_ASYNCH_IO)
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{ DRDATA (LATENCY, sim_asynch_latency, 32), PV_LEFT },
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{ DRDATA (INST_LATENCY, sim_asynch_inst_latency, 32), PV_LEFT },
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#endif
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{ NULL }
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};
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@@ -570,6 +574,7 @@ t_stat clk_svc (UNIT *uptr)
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tmr_poll = sim_rtcn_calb (clk_tps, TMR_CLK); /* calibrate clock */
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sim_activate (&clk_unit, tmr_poll); /* reactivate unit */
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tmxr_poll = tmr_poll * TMXR_MULT; /* set mux poll */
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AIO_SET_INTERRUPT_LATENCY(tmr_poll*clk_tps); /* set interrrupt latency */
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todr_reg = todr_reg + 1; /* incr TODR */
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if ((tmr_iccs & TMR_CSR_RUN) && tmr_use_100hz) /* timer on, std intvl? */
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tmr_incr (TMR_INC); /* do timer service */
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@@ -25,6 +25,7 @@
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cpu VAX central processor
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05-Jan-11 MP Added Asynch I/O support
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24-Apr-10 RMS Added OLDVMS idle timer option
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Fixed bug in SET CPU IDLE
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21-May-08 RMS Removed inline support
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@@ -612,6 +613,7 @@ for ( ;; ) {
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}
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fault_PC = PC;
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recqptr = 0; /* clr recovery q */
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AIO_CHECK_EVENT;
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if (sim_interval <= 0) { /* chk clock queue */
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temp = sim_process_event ();
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if (temp)
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@@ -3108,6 +3110,7 @@ PSL = PSL_IS | PSL_IPL1F;
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SISR = 0;
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ASTLVL = 4;
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mapen = 0;
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FLUSH_ISTR;
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if (M == NULL)
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M = (uint32 *) calloc (((uint32) MEMSIZE) >> 2, sizeof (uint32));
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if (M == NULL)
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@@ -27,6 +27,7 @@
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tto terminal output
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clk 100Hz and TODR clock
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05-Jan-11 MP Added Asynch I/O support
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17-Aug-08 RMS Resync TODR on any clock reset
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18-Jun-07 RMS Added UNIT_IDLE flag to console input, clock
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17-Oct-06 RMS Synced keyboard poll to real-time clock for idling
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@@ -178,6 +179,10 @@ REG clk_reg[] = {
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{ DRDATA (TIME, clk_unit.wait, 24), REG_NZ + PV_LEFT },
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{ DRDATA (POLL, tmr_poll, 24), REG_NZ + PV_LEFT + REG_HRO },
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{ DRDATA (TPS, clk_tps, 8), REG_NZ + PV_LEFT },
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#if defined (SIM_ASYNCH_IO)
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{ DRDATA (LATENCY, sim_asynch_latency, 32), PV_LEFT },
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{ DRDATA (INST_LATENCY, sim_asynch_inst_latency, 32), PV_LEFT },
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#endif
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{ NULL }
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};
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