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ps init with pri=0, as on real 11/70 (ECO-028)
This commit is contained in:
Walter F.J. Mueller
parent
51cb648e54
commit
4569aee760
@ -3,10 +3,10 @@
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### Release highlights
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- bugfix for DIV instruction
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(in [w11a_V0.61](#user-content-w11a_V0.61),
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see [ECO-026-div.md](ECO-026-div.md))
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see [ECO-026](ECO-026-div.md))
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- revised rbus protocol V4
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(in [w11a_V0.62](#user-content-w11a_V0.62),
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see [README_Rlink_V4.md](README_Rlink_V4.md))
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see [README_Rlink_V4(README_Rlink_V4.md))
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- add basic Vivado support
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(in [w11a_V0.64](#user-content-w11a_V0.64))
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- add Nexys4 and Basys3 port of w11a
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@ -585,7 +585,7 @@ Notes:
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### Summary
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- The `div` instruction gave wrong results in some corner cases when either
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divisor or quotient were the largest negative integer (100000 or -32768).
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This is corrected now, for details see [ECO-026-div.md](ECO-026-div.md).
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This is corrected now, for details see [ECO-026](ECO-026-div.md).
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- some minor updates and fixes to support scripts
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- `xtwi` usage and `XTWI_PATH` setup explained in INSTALL.txt
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@ -4,7 +4,7 @@
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- bugfix for mmu trap handling
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(done in [w11a_V0.71](#user-content-w11a_V0.71),
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reported in [w11a_V0.72](#user-content-w11a_V0.72),
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see [ECO-027-trap_mmu.md](ECO-027-trap_mmu.md))
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see [ECO-027](ECO-027-trap_mmu.md))
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- add debug and monitoring units
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(in [w11a_V0.71](#user-content-w11a_V0.71))
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- add Arty port of w11a
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@ -398,7 +398,7 @@
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- added support for the Vivado simulator. Simple test benches work fine.
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Rlink based test benches don't work due to a bug in Vivado 2015.4.
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- A rather esoteric CPU bug was fixed in release V0.71 but forgotten to
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mention in the README. See [ECO-027-trap_mmu.md](ECO-027-trap_mmu.md)
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mention in the README. See [ECO-027](ECO-027-trap_mmu.md)
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for details.
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### Summary
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@ -10,6 +10,7 @@
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<!-- --------------------------------------------------------------------- -->
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---
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## HEAD <a name="head"></a>
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- `PS` initialized now with `000000` (see [ECO-028](ECO-028-ps_init.md))
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<!-- --------------------------------------------------------------------- -->
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---
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@ -20,4 +21,4 @@
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- moved w11 project pages from OpenCores to GitHub-Pages
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[wfjm.github.io/home/w11](https://wfjm.github.io/home/w11/)
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- converted existing documentation from plain text to markdown
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- added README.md files
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- added README.md files in sub-directories
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28
doc/ECO-028-ps_init.md
Normal file
28
doc/ECO-028-ps_init.md
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@ -0,0 +1,28 @@
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# ECO-028: `PS` init fix (2016-12-26)
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### Scope
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- Was in w11a from the very beginning
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- Affects: all w11a systems
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### Symptom summary
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The `PS` was at start-up and after CPU reset initialized to `000340`, thus
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`psw.pri = 7`, thus with interrupts disabled. The real 11/70 actually started
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with `000000` and `psw.pri = 0`, thus with interrupts enabled.
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### Background
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The `PS` reset behavior in the w11a was simply copied from the `simh`
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simulator in 2007, which at this time initialized the `PS` with `000340`.
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Only in 2013 (!) it was realized by Bob Supnik that this was incorrect.
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See the full story in the exhaustive commit message for
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[simh commit f0d41f1](https://github.com/simh/simh/commit/f0d41f15d792b9abc31e8530ee275453c7440a8c).
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### Fixes
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`PS` now initialized with `000000` to stay in line with the real 11/70 and simh.
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### Side effects
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Hopefully none. All `ibus` devices come up with interrupts disabled, so there
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shouldn't be any spurious interrupts at start-up.
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### Provisos
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Even a very plausible behavior like _"disable all interrupts at power on"_ can
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be the incorrect one.
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@ -1,6 +1,6 @@
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-- $Id: pdp11.vhd 750 2016-03-24 23:11:51Z mueller $
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-- $Id: pdp11.vhd 829 2016-12-26 18:56:17Z mueller $
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--
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-- Copyright 2006-2015 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
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-- Copyright 2006-2016 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
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--
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-- This program is free software; you may redistribute and/or modify it under
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-- the terms of the GNU General Public License as published by the Free
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@ -16,10 +16,11 @@
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-- Description: Definitions for pdp11 components
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--
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-- Dependencies: -
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-- Tool versions: ise 8.2-14.7; viv 2014.4; ghdl 0.18-0.31
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-- Tool versions: ise 8.2-14.7; viv 2016.2; ghdl 0.18-0.33
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--
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-- Revision History:
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-- Date Rev Version Comment
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-- 2016-12-26 829 1.6.6 BUGFIX: psw init with pri=0, as on real 11/70
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-- 2015-11-01 712 1.6.5 define sbcntl_sbf_tmu := 12; use for pdp11_tmu_sb
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-- 2015-07-19 702 1.6.4 change DM_STAT_(DP|CO); add DM_STAT_SE
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-- 2015-07-10 700 1.6.3 define c_cpurust_hbpt;
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@ -122,7 +123,7 @@ package pdp11 is
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constant psw_init : psw_type := (
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"00","00", -- cmode, pmode (=kernel)
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'0',"111",'0', -- rset, pri (=7), tflag
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'0',"000",'0', -- rset, pri (=0), tflag
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"0000" -- cc NZVC=0
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);
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@ -1,7 +1,8 @@
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# $Id: tb_pdp11core_stim.dat 716 2015-12-22 21:44:33Z mueller $
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# $Id: tb_pdp11core_stim.dat 829 2016-12-26 18:56:17Z mueller $
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#
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# Revision History:
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# Date Rev Version Comment
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# 2016-12-26 829 2.8 PSW now 000000 after cpu reset (cres)
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# 2015-12-22 716 2.7 comment out test 20.13 (fails since r708)
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# 2015-05-08 675 2.6 start/stop/suspend overhaul
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# 2014-12-26 621 2.5 adopt wmembe,ribr,wibr emulation to new 4k window
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@ -420,7 +421,7 @@ rpc d=000020 -- ! pc
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wal 001374
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brm 2
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d=002206 -- ! (sp) old pc
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d=000341 -- ! 2(sp) old ps
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d=000001 -- ! 2(sp) old ps
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#-----------------------------------------------------------------------------
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C Setup code 3 [base 2300] (bpt against trap handler doing inc r0; rtt)
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#
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@ -816,7 +817,7 @@ rr5 d=003424 -- ! r5=3424
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rpc d=003356 -- ! pc
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wal 003400
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brm 10
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d=000340 -- ! mem(3400) after start
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d=000000 -- ! mem(3400) after start
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d=030000 -- ! mem(3402) after mov #030000,(r0)
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d=030003 -- ! mem(3404) after se(v,c) (VC)
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d=030341 -- ! mem(3406) after spl 7 (pri=7,C)
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@ -1100,7 +1101,7 @@ cres
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stapc 004030 -- start @ 4030 (just HALT, testing console reset)
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wtgo
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rpc d=004032 -- ! pc=4032
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rps d=000340 -- ! psw: reset by CRESET
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rps d=000000 -- ! psw: reset by CRESET
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wal 172516 -- SSR3
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rmi d=000000 -- ! cleared by CRESET
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wal 177572 -- SSR0
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@ -5373,7 +5374,7 @@ rsp d=001374 -- ! sp=1374
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wal 001374 -- check stack
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brm 2
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d=100002 -- trap address: PC inc'ed expected for 11/70 [[s:100000]]
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d=000340 -- PSW
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d=000000 -- PSW
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cres -- console reset (to clear CPUERR reg)
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#
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# simh notes:
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