diff options
| -rw-r--r-- | src/supervisor.tex | 23 |
1 files changed, 10 insertions, 13 deletions
diff --git a/src/supervisor.tex b/src/supervisor.tex index a16504a..2450a28 100644 --- a/src/supervisor.tex +++ b/src/supervisor.tex @@ -1155,21 +1155,18 @@ follows: current privilege mode and the value of the SUM and MXR fields of the {\tt mstatus} register. If not, stop and raise a page-fault exception. -\item If $pte.a=0$, perform either of the following two actions: - \begin{itemize} - \item Atomically with respect to the permission check in step 5, - set $pte.a$ to 1. If this access violates a PMA or PMP check, raise - an access exception. - \item Raise a page-fault exception. - \end{itemize} +\item If $i>0$ and $pa.ppn[i-1:0]\neq 0$, this is a misaligned superpage; + stop and raise a page-fault exception. -\item If the memory access is a store and $pte.d=0$, perform either of the - following two actions: +\item If $pte.a=0$, or if the memory access is a store and $pte.d=0$, either + raise a page-fault exception or: \begin{itemize} - \item Atomically with respect to the permission check in step 5 and - the access to $pte.a$ in step 6, set $pte.d$ to 1. If this access - violates a PMA or PMP check, raise an access exception. - \item Raise a page-fault exception. + \item Set $pte.a$ to 1 and, if the memory access is a store, also set + $pte.d$ to 1. + \item If this access violates a PMA or PMP check, raise an access exception. + \item This update and the loading of $pte$ in step 2 must be atomic; in + particular, no intervening store to the PTE may be perceived to have + occurred in-between. \end{itemize} \item The translation is successful. The translated physical address is |