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Update Smrnmi to account for Smdbltrp extension #1248

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Mar 5, 2024
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Update Smrnmi to account for Smdbltrp extension #1248

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6 changes: 3 additions & 3 deletions src/images/bytefield/mncause.edn
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Original file line number Diff line number Diff line change
Expand Up @@ -8,9 +8,9 @@
(def boxes-per-row 32)
(draw-column-headers {:height 24 :font-size 24 :labels (reverse ["0" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "MXLEN-2" "" "" "" "MXLEN-1" ""])})

(draw-box "1" {:span 4})
(draw-box (text "NMI Cause" {:font-size 24}) {:span 14 :text-anchor "end" :borders {:top :border-unrelated :bottom :border-unrelated :left :border-unrelated}})
(draw-box "Interrupt" {:span 4})
(draw-box (text "Exception Code" {:font-size 24}) {:span 14 :text-anchor "end" :borders {:top :border-unrelated :bottom :border-unrelated :left :border-unrelated}})
(draw-box (text "(WARL)" {:font-weight "bold" :font-size 24}) {:span 14 :text-anchor "start" :borders {:top :border-unrelated :right :border-unrelated :bottom :border-unrelated}})
(draw-box "1" {:span 4 :borders {}})
(draw-box "MXLEN-1" {:font-size 24 :span 28 :borders {}})
----
----
12 changes: 9 additions & 3 deletions src/rnmi.adoc
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Expand Up @@ -71,9 +71,15 @@ of holding.
.Resumable NMI cause `mncause`.
include::images/bytefield/mncause.edn[]

The `mncause` CSR holds the reason for the NMI, with bit MXLEN-1 set to
1, and the NMI cause encoded in the least-significant bits or zero if
NMI causes are not supported.
The `mncause` CSR holds the reason for the NMI.
If the reason is an interrupt, bit MXLEN-1 is set to 1, and the NMI
cause is encoded in the least-significant bits.
If the reason is an interrupt and NMI causes are not supported, bit MXLEN-1 is
set to 1, and zero is written to the least-significant bits.
If the reason is an exception within M-mode that results in a double trap as
specified in the Smdbltrp extension, bit MXLEN-1 is set to 0 and the
least-significant bits are set to the cause code corresponding to the
exception that precipitated the double trap.

.Resumable NMI status register `mnstatus`.
include::images/bytefield/mnstatus.edn[]
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