Specify which instructions are affected by Zamzam

1 files changed, 8 insertions, 4 deletions

diff --git a/src/zam.tex b/src/zam.tex
index 085ab51..16818f2 100644
--- a/src/zam.tex
+++ b/src/zam.tex
@@ -5,7 +5,11 @@
 accepted as standard by RISC-V International.}
 
 This chapter defines the ``Zam'' extension, which standardizes atomicity
-guarantees for misaligned memory accesses.
+guarantees for certain misaligned memory accesses.
+
+\begin{commentary}
+The Zam extension does not alter the specification of aligned memory accesses.
+\end{commentary}
 
 The Zam extension defines the concept of ``misaligned atomicity granule''
 (MAG), an aligned power-of-two number of bytes within which a misaligned
@@ -31,6 +35,6 @@ multiple MAGs must raise an exception, whereas regular loads and
 stores may either raise an exception or proceed non-atomically.
 \end{commentary}
 
-\begin{commentary}
-The Zam extension does not alter the specification of aligned memory accesses.
-\end{commentary}
+The Zam extension affects only the memory-access instructions defined in the
+base ISAs and the A, F, D, Q, C, Zcb, Zfh, and hypervisor extensions, and only
+those memory accesses no wider than XLEN bits.