arch-power: Add fields for DX form instructions

This introduces the extended opcode field for DS form
instructions and the fields d0, d1 and d2 which are
concatenated for specifying a signed integer immediate
operand.

Change-Id: Id60e85d79f9157d680f813bf90ab6e1e064253a9
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/40901
Reviewed-by: Boris Shingarov <shingarov@labware.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
2 files changed