add rpte bitfields valid and leaf

diff --git a/src/soc/decoder/isa/radixmmu.py b/src/soc/decoder/isa/radixmmu.py
index 8b716aa55355713dad482a64cba8376dfd151f52..34e5d4bbd8f362e57b358c41adf1ee0efbf153c7 100644 (file)
--- a/src/soc/decoder/isa/radixmmu.py
+++ b/src/soc/decoder/isa/radixmmu.py
@@ -31,6 +31,18 @@ def genmask(shift, size):
             res[size-1-i] = SelectableInt(1, 1)
     return res
 
+# NOTE: POWER 3.0B annotation order!  see p4 1.3.2
+# MSB is indexed **LOWEST** (sigh)
+# from gem5 radixwalk.hh
+# Bitfield<63> valid;  64 - (63 + 1) = 0
+# Bitfield<62> leaf;   64 - (62 + 1) = 1
+
+def rpte_valid(r):
+    return bool(r[0])
+
+def rpte_leaf(r):
+    return bool(r[1])
+
 """
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