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encoding clarification for MTT implicit accesses #104

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Oct 28, 2024
Merged

encoding clarification for MTT implicit accesses #104

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b9171d9
encoding clarification for MTT implicit accesses
rsahita Oct 28, 2024
b9026b3
moved location of note on MBE control
rsahita Oct 28, 2024
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3 changes: 2 additions & 1 deletion chapter4.adoc
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Expand Up @@ -324,7 +324,8 @@ translation, but excluding MTT checker accesses to MTT structures. Data accesses
in M-mode when the MPRV bit in mstatus is set and the MPP field in mstatus contains S
or U are subject to MTT checks. MTT checker accesses to MTT structures are to be
treated as implicit M-mode accesses and are subject to PMP/Smepmp and
IOPMP checks. The MTT checker indexes the MTT using the
IOPMP checks. Implicit accesses to the MTT are governed by `mstatus.MBE` control
for RV64 and `mstatush.MBE` control for RV32. The MTT checker indexes the MTT using the
physical address of the access to lookup and enforce the access permissions.
A mismatch of the access type and the access permissions specified in the
MTT entry that applies to the accessed region is reported as a trap to the
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