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82 lines
2.7 KiB
Python
82 lines
2.7 KiB
Python
from amaranth import *
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from power_fv import pfv
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from power_fv.insn.const import *
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from . import InsnSpec
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from .utils import iea
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__all__ = ["CRSpec"]
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class CRSpec(InsnSpec, Elaboratable):
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def __init__(self, insn):
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self.pfv = pfv.Interface()
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self.insn = insn
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def elaborate(self, platform):
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m = Module()
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m.d.comb += [
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self.pfv.stb .eq(1),
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self.pfv.insn.eq(Cat(Const(0, 32), self.insn.as_value())),
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self.pfv.intr.eq(0),
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self.pfv.nia .eq(iea(self.pfv.cia + 4, self.pfv.msr.r_data.sf)),
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self.pfv.msr.r_mask.sf.eq(1),
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]
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if isinstance(self.insn, (
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CRAND, CROR , CRNAND, CRXOR,
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CRNOR, CRANDC, CREQV , CRORC,
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)):
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src_a = Signal()
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src_b = Signal()
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result = Signal()
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m.d.comb += [
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self.pfv.cr.r_mask[::-1].bit_select(self.insn.BA, width=1).eq(1),
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self.pfv.cr.r_mask[::-1].bit_select(self.insn.BB, width=1).eq(1),
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src_a.eq(self.pfv.cr.r_data[::-1].bit_select(self.insn.BA, width=1)),
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src_b.eq(self.pfv.cr.r_data[::-1].bit_select(self.insn.BB, width=1)),
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]
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if isinstance(self.insn, CRAND):
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m.d.comb += result.eq(src_a & src_b)
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if isinstance(self.insn, CROR):
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m.d.comb += result.eq(src_a | src_b)
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if isinstance(self.insn, CRNAND):
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m.d.comb += result.eq(~(src_a & src_b))
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if isinstance(self.insn, CRXOR):
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m.d.comb += result.eq(src_a ^ src_b)
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if isinstance(self.insn, CRNOR):
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m.d.comb += result.eq(~(src_a | src_b))
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if isinstance(self.insn, CRANDC):
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m.d.comb += result.eq(src_a & ~src_b)
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if isinstance(self.insn, CREQV):
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m.d.comb += result.eq(src_a == src_b)
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if isinstance(self.insn, CRORC):
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m.d.comb += result.eq(src_a | ~src_b)
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m.d.comb += [
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self.pfv.cr.w_mask[::-1].bit_select(self.insn.BT, width=1).eq(1),
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self.pfv.cr.w_data[::-1].bit_select(self.insn.BT, width=1).eq(result),
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]
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elif isinstance(self.insn, MCRF):
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field = Signal(4)
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m.d.comb += [
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field.eq(self.pfv.cr.r_data[::-1].word_select(self.insn.BFA, width=4)),
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self.pfv.cr.r_mask[::-1].word_select(self.insn.BFA, width=4).eq(0b1111),
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self.pfv.cr.w_mask[::-1].word_select(self.insn.BF, width=4).eq(0b1111),
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self.pfv.cr.w_data[::-1].word_select(self.insn.BF, width=4).eq(field),
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]
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else:
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assert False
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return m
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