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[libreriscv.git] / openpower / sv / sprs.mdwn

diff --git a/openpower/sv/sprs.mdwn b/openpower/sv/sprs.mdwn
index ac4d2fa51d37dc7c7c85b46ead7edb5a770f7424..aae560cf41e26d21a9a4ecff54a17f1f3e995693 100644 (file)
--- a/openpower/sv/sprs.mdwn
+++ b/openpower/sv/sprs.mdwn
@@ -2,7 +2,7 @@
 
 # SPRs <a name="sprs"></a>
 
-Note OpenPOWER v3.1B p12:
+Note OpenPOWER v3.1 p12:
 
      The designated SPR sandbox consists of non-privileged SPRs
      704-719 and privileged SPRs 720-735.
@@ -11,7 +11,7 @@ There are five SPRs, available in any privilege level:
 
 * MVL (the Maximum Vector Length)
 * VL (which has different characteristics from standard SPRs)
-* SUBVL (effectively a kind of SIMD)
+* SUBVL (effectively a kind of Packed SIMD of size 2, 3 or 4)
 * SVSTATE (containing copies of MVL, VL and SUBVL as well as context information)
 * SVSRR0 which is used for exceptions and traps to store SVSTATE.
 
@@ -70,6 +70,10 @@ full context save/restore (see SVSRR0).  It contains (and permits setting of):
 * vfirst - Vertical First mode.  srcstep, dststep and substep
     **do not advance** unless explicitly requested to do so with
     pseudo-op svstep (a mode of setvl)
+* RMpst - REMAP persistence.  REMAP will apply only to the following
+  instruction unless this bit is set, in which case REMAP "persists".
+  Reset (cleared) on use of the `setvl` instruction if used to
+  alter VL or MVL.
 * hphint - Horizontal Parallelism Hint. In Vertical First Mode
    hardware **MAY** perform up to this many elements in parallel
    per instruction. Set to zero to indicate "no hint".
@@ -110,8 +114,8 @@ The format of the SVSTATE SPR is as follows:
 | 38:39 | mo0      | REMAP RT SVSHAPE0-3    |
 | 40:41 | mo1      | REMAP EA SVSHAPE0-3    |
 | 42:46 | SVme     | REMAP enable (RA-RT)  |
-| 47:54 | rsvd     | reserved              |
-| 55:61 | hphint   | horizontal parallelism hint  |
+| 47:48 | srcsubvl | Source Sub-vector length   |
+| 49:61 | rsvd     | reserved              |
 | 62    | RMpst    | REMAP persistence     |
 | 63    | vfirst   | Vertical First mode   |