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| -rw-r--r-- | src/machine.tex | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/machine.tex b/src/machine.tex index d202e97..eb8b15e 100644 --- a/src/machine.tex +++ b/src/machine.tex @@ -678,6 +678,12 @@ Note that, while SUM is ordinarily ignored when not executing in S-mode, it {\em is} in effect when MPRV=1 and MPP=S. SUM is hardwired to 0 if S-mode is not supported. +\begin{commentary} +The MXR and SUM mechanisms only affect the interpretation of permissions +encoded in page-table entries. In particular, they have no impact on whether +access exceptions are raised due to PMAs or PMP. +\end{commentary} + \subsubsection{Virtualization Support in {\tt mstatus} Register} \label{virt-control} |