metag: Basic documentation

Add basic metag documentation. This includes an outline description of
the ABIs (including syscall ABI) and calling conventions, similar to the
one in Documentation/frv/.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Rob Landley <rob@landley.net>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: linux-doc@vger.kernel.org

1 files changed, 4 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 6c723811c0a0..3101709963cb 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -970,6 +970,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                                If specified, z/VM IUCV HVC accepts connections
                                from listed z/VM user IDs only.
 
+        hwthread_map=   [METAG] Comma-separated list of Linux cpu id to
+                                hardware thread id mappings.
+                                Format: <cpu>:<hwthread>
+
         keep_bootcon    [KNL]
                         Do not unregister boot console at start. This is only
                         useful for debugging when something happens in the window