From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Wed, 27 May 2020 17:31:14 +0000 (+0100)
Subject: add LD/ST pipe_data
X-Git-Tag: div_pipeline~785
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b62483fecba7fa72e63791281c4a12e4862d628d;p=soc.git

add LD/ST pipe_data
---

diff --git a/src/soc/fu/ldst/pipe_data.py b/src/soc/fu/ldst/pipe_data.py
new file mode 100644
index 00000000..85b56f55
--- /dev/null
+++ b/src/soc/fu/ldst/pipe_data.py
@@ -0,0 +1,64 @@
+from nmigen import Signal, Const
+from soc.fu.alu.alu_input_record import CompLDSTOpSubset
+from soc.fu.pipe_data import IntegerData, CommonPipeSpec
+from ieee754.fpcommon.getop import FPPipeContext
+from soc.decoder.power_decoder2 import Data
+
+
+class LDSTInputData(IntegerData):
+    regspec = [('INT', 'a', '0:63'),
+               ('INT', 'b', '0:63'),
+               ('INT', 'c', '0:63'),
+               ('XER', 'xer_so', '32')]
+               ]
+    def __init__(self, pspec):
+        super().__init__(pspec)
+        self.a = Signal(64, reset_less=True) # RA
+        self.b = Signal(64, reset_less=True) # RB/immediate
+        self.c = Signal(64, reset_less=True) # RC
+        self.xer_so = Signal(reset_less=True) # XER bit 32: SO
+
+    def __iter__(self):
+        yield from super().__iter__()
+        yield self.a
+        yield self.b
+        yield self.c
+        yield self.xer_so
+
+    def eq(self, i):
+        lst = super().eq(i)
+        return lst + [self.a.eq(i.a), self.b.eq(i.b), self.c.eq(i.c),
+                      self.xer_so.eq(i.xer_so)]
+
+
+class LDSTOutputData(IntegerData):
+    regspec = [('INT', 'o', '0:63'),
+               ('INT', 'ea', '0:63'),
+               ('CR', 'cr0', '0:3'),
+               ('XER', 'xer_so', '32')]
+    def __init__(self, pspec):
+        super().__init__(pspec)
+        self.o = Data(64, name="stage_o")
+        self.ea = Data(64, name="ea")
+        self.cr0 = Data(4, name="cr0")
+        self.xer_so = Data(1, name="xer_so")
+
+    def __iter__(self):
+        yield from super().__iter__()
+        yield self.o
+        yield self.ea
+        yield self.xer_ca
+        yield self.cr0
+        yield self.xer_so
+
+    def eq(self, i):
+        lst = super().eq(i)
+        return lst + [self.o.eq(i.o),
+                      self.ea.eq(i.ea),
+                      self.cr0.eq(i.cr0),
+                      self.xer_so.eq(i.xer_so)]
+
+
+class LDSTPipeSpec(CommonPipeSpec):
+    regspec = (LDSTInputData.regspec, LDSTOutputData.regspec)
+    opsubsetkls = CompLDSTOpSubset