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\chapter{Preface}
This is version 1.9.1 of the RISC-V privileged architecture
proposal. Changes from version 1.9 include:
\begin{itemize}
\parskip 0pt
\itemsep 1pt
\item Numerous additions and improvements to the commentary sections.
\item Change configuration string proposal to be use a search process
that supports various formats including Device Tree String and
flattened Device Tree.
\item Made {\tt misa} optionally writable to support modifying base
and supported ISA extensions. CSR address of {\tt misa} changed.
\item Added description of debug mode and debug CSRs.
\item Added a hardware performance monitoring scheme. Simplified the
handling of existing hardware counters, removing privileged versions
of the counters and the corresponding delta registers.
\item Fixed description of SPIE in presence of user-level interrupts.
\end{itemize}
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