Merge pull request #153 from riscv-software-src/v

Add V skeleton

Author: dhower-qc

arch/ext/V.yaml

@@ -0,0 +1,17 @@
+# yaml-language-server: $schema=../../schemas/ext_schema.json
+
+V:
+  type: unprivileged
+  long_name: Variable-length vector
+  versions:
+  - version: "1.0.0"
+    state: ratified
+    ratification_date: null
+  description: |
+    TODO
+  params:
+    MUTABLE_MISA_V:
+      description: |
+        Indicates whether or not the `V` extension can be disabled with the `misa.V` bit.
+      schema:
+        type: boolean

cfgs/generic_rv64/implemented_exts.yaml

@@ -14,6 +14,7 @@ implemented_extensions:
   - [Smhpm, "1.12.0"]
   - [Smpmp, "1.12.0"]
   - [U, "1.12.0"]
+  - [V, "1.0.0"]
   - [Zicntr, "2.0.0"]
   - [Zicsr, "2.0.0"]
   - [Zihpm, "2.0.0"]

cfgs/generic_rv64/params.yaml

@@ -372,6 +372,10 @@ params:
   # the extension can be disabled in the `misa.U` bit.
   MUTABLE_MISA_U: false
 
+  # when the V extensions is supported, indicates whether or not
+  # the extension can be disabled in the `misa.V` bit.
+  MUTABLE_MISA_V: false
+
   # size of a cache block, in bytes
   CACHE_BLOCK_SIZE: 64