From: lkcl <lkcl@web>
Date: Wed, 30 Dec 2020 20:28:43 +0000 (+0000)
Subject: (no commit message)
X-Git-Tag: convert-csv-opcode-to-binary~690
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=069e560912156707cd40f22507cd55f99e034889;p=libreriscv.git

---

diff --git a/openpower/sv/svp64.mdwn b/openpower/sv/svp64.mdwn
index 9db2e1969..5a4704218 100644
--- a/openpower/sv/svp64.mdwn
+++ b/openpower/sv/svp64.mdwn
@@ -214,6 +214,10 @@ Fields:
 * **N** sets signed/unsigned saturation.
 **RC1** as if Rc=1, stores CRs *but not the result*
 
+## LD/ST ffirst
+
+ffirst LD/ST to multiple pages via a Vectorised base is considered a security risk due to the abuse of probing multiple pages in rapid succession and getting feedback on which pages would fail.  Therefore in these special circumstances requesting ffirst eith a vector base is instead interpreted as element-strided LD/ST.
+
 # ELWIDTH Encoding
 
 Default behaviour is set to 0b00 so that zeros follow the convention of