From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Wed, 17 Mar 2021 13:16:24 +0000 (+0000)
Subject: whoops shift has to be done at same bitwidth
X-Git-Tag: convert-csv-opcode-to-binary~19
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4503683e7b8bd78080337b282688e1ad04628d45;p=soc.git

whoops shift has to be done at same bitwidth
---

diff --git a/src/soc/decoder/isa/radixmmu.py b/src/soc/decoder/isa/radixmmu.py
index fa03fa12..a376e3dc 100644
--- a/src/soc/decoder/isa/radixmmu.py
+++ b/src/soc/decoder/isa/radixmmu.py
@@ -392,7 +392,8 @@ class RADIX:
         if mbits < 5 or mbits > 16:
             print("badtree")
             return "badtree"
-        shift = shift - mbits
+        # reduce shift (has to be done at same bitwidth)
+        shift = shift - selectconcat(SelectableInt(0, 1), mbits)
         mask_size = mbits[1:5] # get 4 LSBs
         pgbase = selectconcat(data[8:56], SelectableInt(0, 8)) # shift up 8
         return shift, mask_size, pgbase