From: lkcl <lkcl@web>
Date: Sun, 17 Jul 2022 09:57:41 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~1172
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2ccadf5a6f24efab11ae0638c2214da85d1180dc;p=libreriscv.git

---

diff --git a/openpower/sv/sprs.mdwn b/openpower/sv/sprs.mdwn
index 53f812a09..e6913af39 100644
--- a/openpower/sv/sprs.mdwn
+++ b/openpower/sv/sprs.mdwn
@@ -7,7 +7,7 @@ Note OpenPOWER v3.1 p12:
      The designated SPR sandbox consists of non-privileged SPRs
      704-719 and privileged SPRs 720-735.
 
-There are five SPRs, available in any privilege level:
+There are eight SPRs, available in any privilege level:
 
 * SVSTATE (containing copies of MVL, VL and SUBVL as well as context information)
 * SVSRR0 which is used for exceptions and traps to store SVSTATE.
@@ -15,6 +15,9 @@ There are five SPRs, available in any privilege level:
 * SVSHAPE0-3 for REMAP purposes, re-shaping Vector loops
 * SVREMAP for applying specific shapes to specific registers
 
+If SVSTATE is all zeros then SV is disabled and the contents of the
+other SPRs SVSHAPE/SVREMAP are ignored.
+
 For Privilege Levels (trap handling) there are the following SPRs,
 where x may be u, s or h for User, Supervisor or Hypervisor
 Modes respectively:
@@ -28,7 +31,7 @@ of its (x)eSTATE are swapped with SVSTATE.
 
 # SVSTATE
 
-This is a standard SPR that contains sufficient information for a
+This is a standard SPR that (REMAP aside) contains sufficient information for a
 full context save/restore (see SVSRR0).  It contains (and permits setting of):
 
 * MVL (the Maximum Vector Length) - declares (statically) how