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Add Smrnmi handling #209

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merged 4 commits into from
Mar 15, 2024
Merged

Add Smrnmi handling #209

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fa86cc1
add Smrnmi handling
ved-rivos Mar 14, 2024
e1b0bc2
update to latest cfg from docs-spec-template
kbroch-rivosinc Mar 15, 2024
ed6fc62
update docs resources
ved-rivos Mar 15, 2024
4b56b14
Merge branch 'main' into smrnmi
ved-rivos Mar 15, 2024
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7 changes: 7 additions & 0 deletions cfi_forward.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -590,6 +590,13 @@ at the privilege level the hart was previously in, and the `ELP` is set to
value `y`, then `ELP` is set to the value of `pelp` if `__y__LPE` is 1;
otherwise, it is set to `NO_LP_EXPECTED`.

When the Smrnmi extension is implemented, a `MNPELP` field (bit 9) is provided
in the `mnstatus` CSR to hold the previous `ELP` state on a trap to the RNMI
handler. When a RNMI trap is delivered, the `MNPELP` is set to `ELP` and `ELP`
set to `NO_LP_EXPECTED`. Upon a `MNRET`, if the `mnstatus.MNPP` holds the value
`y`, then `ELP` is set to the value of `MNPELP` if `yLPE` is 1; otherwise, it is
set to `NO_LP_EXPECTED`.

[NOTE]
====
The trap handler in privilege mode `x` must save the `__x__PELP` bit and the
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