checks.insn: add check for MCRF instruction.

power_fv/checks/insn/_cr.py

@@ -37,8 +37,7 @@ class CRSpec(Elaboratable):
         spec_cr_w_stb  = Signal(8)
         spec_cr_w_data = Signal(32)
 
-        if isinstance(spec_insn, (Instruction_XL_crl)):
+        if isinstance(spec_insn, Instruction_XL_crl):
-
             ba_r_field = Signal(4)
             bb_r_field = Signal(4)
             bt_r_field = Signal(4)
@@ -89,6 +88,18 @@ class CRSpec(Elaboratable):
                 spec_cr_w_stb[::-1].bit_select(spec_insn.bt[2:], width=1).eq(1),
                 spec_cr_w_data[::-1].eq(Repl(spec_bt_w_field, 8))
             ]
+
+        elif isinstance(spec_insn, MCRF):
+            bfa_r_field = Signal(4)
+
+            m.d.comb += [
+                bfa_r_field.eq(self.pfv.cr.r_data[::-1].word_select(spec_insn.bfa, width=4)),
+
+                spec_cr_r_stb[::-1].bit_select(spec_insn.bfa, width=1).eq(1),
+                spec_cr_w_stb[::-1].bit_select(spec_insn.bf,  width=1).eq(1),
+                spec_cr_w_data[::-1].eq(Repl(bfa_r_field, 8)),
+            ]
+
         else:
             assert False
 

power_fv/checks/insn/_fmt.py

@@ -3,7 +3,11 @@ from amaranth.asserts import AnyConst
 from amaranth.hdl.ast import ValueCastable
 
 
-__all__ = ["Instruction_I", "Instruction_B", "Instruction_XL_bc", "Instruction_XL_crl"]
+__all__ = [
+    "Instruction_I",
+    "Instruction_B",
+    "Instruction_XL_bc", "Instruction_XL_crl", "Instruction_XL_crf",
+]
 
 
 class Instruction_I(ValueCastable):
@@ -94,3 +98,30 @@ class Instruction_XL_crl(ValueCastable):
     @ValueCastable.lowermethod
     def as_value(self):
         return Cat(self._0, self.xo, self.bb, self.ba, self.bt, self.po)
+
+
+class Instruction_XL_crf(ValueCastable):
+    po  = None
+    bf  = None
+    _0  = None
+    bfa = None
+    _1  = None
+    _2  = None
+    xo  = None
+    _3  = None
+
+    def __init_subclass__(cls, *, po, xo):
+        cls.po = Const(po, unsigned( 6))
+        cls.xo = Const(xo, unsigned(10))
+
+    def __init__(self):
+        self.bf  = AnyConst(unsigned(3))
+        self._0  = AnyConst(unsigned(2))
+        self.bfa = AnyConst(unsigned(3))
+        self._1  = AnyConst(unsigned(2))
+        self._2  = AnyConst(unsigned(5))
+        self._3  = AnyConst(unsigned(1))
+
+    @ValueCastable.lowermethod
+    def as_value(self):
+        return Cat(self._3, self.xo, self._2, self._1, self.bfa, self._0, self.bf, self.po)

power_fv/checks/insn/_insn.py

@@ -29,3 +29,5 @@ class CRNOR  (_fmt.Instruction_XL_crl, po=19, xo= 33): pass
 class CRANDC (_fmt.Instruction_XL_crl, po=19, xo=129): pass
 class CREQV  (_fmt.Instruction_XL_crl, po=19, xo=289): pass
 class CRORC  (_fmt.Instruction_XL_crl, po=19, xo=417): pass
+
+class MCRF   (_fmt.Instruction_XL_crf, po=19, xo=0): pass

power_fv/checks/insn/all.py

@@ -31,3 +31,5 @@ class CRNOR  (CRCheck, name="insn_crnor",  insn_cls=_insn.CRNOR ): pass
 class CRANDC (CRCheck, name="insn_crandc", insn_cls=_insn.CRANDC): pass
 class CREQV  (CRCheck, name="insn_creqv",  insn_cls=_insn.CREQV ): pass
 class CRORC  (CRCheck, name="insn_crorc",  insn_cls=_insn.CRORC ): pass
+
+class MCRF   (CRCheck, name="insn_mcrf",   insn_cls=_insn.MCRF  ): pass