[otbn,doc] Add a diagram showing how the SV <-> Python bridge works
This is a bit complicated and I've explained it in person a couple of
times so it probably makes sense to document properly.
Signed-off-by: Rupert Swarbrick <rswarbrick@lowrisc.org>
diff --git a/hw/ip/otbn/doc/dv/index.md b/hw/ip/otbn/doc/dv/index.md
index 195977d..4b8eaa6 100644
--- a/hw/ip/otbn/doc/dv/index.md
+++ b/hw/ip/otbn/doc/dv/index.md
@@ -52,7 +52,11 @@
As well as instantiating OTBN, the testbench also instantiates an `otbn_core_model`.
This module wraps an ISS (instruction set simulator) subprocess and performs checks to make sure that OTBN behaves the same as the ISS.
-The model communicates with the testbench through an `otbn_model_if` interface, which is monitored by the `otbn_model_agent`, described below.
+The `otbn_core_model` module communicates with test sequences through an `otbn_model_if` interface, which is monitored by the `otbn_model_agent`, described below.
+The module communicates with the Python subprocess as shown in the diagram below.
+
+
+
### OTBN model agent
diff --git a/hw/ip/otbn/doc/dv/model.svg b/hw/ip/otbn/doc/dv/model.svg
new file mode 100644
index 0000000..d258423
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:4.23333px;line-height:5.66964px;font-family:'Liberation Mono';-inkscape-font-specification:'Liberation Mono';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;vector-effect:none;fill:#000000;fill-opacity:1;stroke-width:0.264583;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;stop-color:#000000;stop-opacity:1">Extra back-door</tspan><tspan
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:4.23333px;line-height:5.66964px;font-family:'Liberation Mono';-inkscape-font-specification:'Liberation Mono';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;vector-effect:none;fill:#000000;fill-opacity:1;stroke-width:0.264583;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;stop-color:#000000;stop-opacity:1"
+ id="tspan1238">pins to snoop on</tspan><tspan
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:4.23333px;line-height:5.66964px;font-family:'Liberation Mono';-inkscape-font-specification:'Liberation Mono';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;vector-effect:none;fill:#000000;fill-opacity:1;stroke-width:0.264583;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;stop-color:#000000;stop-opacity:1"
+ id="tspan1240">what's going on in</tspan><tspan
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:4.23333px;line-height:5.66964px;font-family:'Liberation Mono';-inkscape-font-specification:'Liberation Mono';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;vector-effect:none;fill:#000000;fill-opacity:1;stroke-width:0.264583;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;stop-color:#000000;stop-opacity:1"
+ id="tspan1242">the design.</tspan></text>
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'">The code in otbn_core_model.sv is designed to be</tspan><tspan
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'">as minimal as possible, just tracking clock edges</tspan><tspan
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'">and resets and passing all the work over DPI to the</tspan><tspan
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan176">model itself.</tspan></text>
+ <text
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+ style="color:#000000;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:21.4286px;font-family:'Liberation Mono';-inkscape-font-specification:'Liberation Mono';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;overflow:visible;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;fill-rule:evenodd;stroke:none;stroke-width:0.999999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;marker-end:url(#Arrow1Mend);stop-color:#000000;stop-opacity:1"
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2122">otbn_model.cc translates from DPI calls to a more</tspan><tspan
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+ x="630"
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2126">object-orientated framework. It does a small amount</tspan><tspan
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+ x="630"
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2130">of "lifetime modelling", handling how we check things</tspan><tspan
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+ x="630"
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2132">at start/end of operation. It is also in charge of</tspan><tspan
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+ x="630"
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2134">translation between C++ types and SV DPI types.</tspan></text>
+ <text
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+ style="color:#000000;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:21.4286px;font-family:'Liberation Mono';-inkscape-font-specification:'Liberation Mono';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;overflow:visible;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;fill-rule:evenodd;stroke:none;stroke-width:0.999999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;marker-end:url(#Arrow1Mend);stop-color:#000000;stop-opacity:1"
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+ transform="matrix(0.26458333,0,0,0.26458333,-2.7405567,98.141427)"><tspan
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2148">The ISSWrapper class in iss_wrapper.h and</tspan><tspan
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+ x="630"
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2181">iss_wrapper.cc doesn't know much about OTBN.</tspan><tspan
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+ x="630"
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2185">Instead, it's in charge of managing the ISS process</tspan><tspan
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+ x="630"
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2187">and communication with that subprocess over</tspan><tspan
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2191">pipes.</tspan></text>
+ <text
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2203">stepped.py is a script front-end for running the</tspan><tspan
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2221">ISS (similar to standalone.py, which is more</tspan><tspan
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2223">convenient on the command line). It implements a</tspan><tspan
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2225">simple REPL, converting text-mode commands from</tspan><tspan
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+ x="630"
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2227">stdin to Python calls and serializing results back to</tspan><tspan
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+ x="630"
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2229">text on stdout.</tspan></text>
+ <text
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+ style="color:#000000;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:21.4286px;font-family:'Liberation Mono';-inkscape-font-specification:'Liberation Mono';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;overflow:visible;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;fill-rule:evenodd;stroke:none;stroke-width:0.999999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;marker-end:url(#Arrow1Mend);stop-color:#000000;stop-opacity:1"
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+ transform="matrix(0.26458333,0,0,0.26458333,-2.7405567,196.66815)"><tspan
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+ x="630"
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2241">Together with the other Python files in the sim/</tspan><tspan
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2265">directory, Sim.py forms the core of the instruction</tspan><tspan
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+ x="630"
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2267">set simulator, which is the golden reference model</tspan><tspan
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
+ id="tspan2269">for OTBN.</tspan></text>
+ <text
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