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53 lines
1.5 KiB
Python
53 lines
1.5 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__ = ["SystemCallSpec"]
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class SystemCallSpec(InsnSpec, Elaboratable):
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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.msr.r_mask.sf.eq(1),
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]
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if isinstance(self.insn, SC):
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def _msr_to_srr1(start, stop):
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stmts = [
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self.pfv.msr .r_mask[63-stop:64-start].eq(Repl(1, stop-start+1)),
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self.pfv.srr1.w_mask[63-stop:64-start].eq(Repl(1, stop-start+1)),
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self.pfv.srr1.w_data[63-stop:64-start].eq(self.pfv.msr.r_data[63-stop:64-start]),
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]
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return stmts
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m.d.comb += [
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self.pfv.srr0.w_mask.eq(Repl(1, 64)),
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self.pfv.srr0.w_data.eq(iea(self.pfv.cia + 4, self.pfv.msr.r_data.sf)),
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self.pfv.srr1.w_mask[63-36:64-33].eq(Repl(1, 4)),
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self.pfv.srr1.w_data[63-36:64-33].eq(0),
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self.pfv.srr1.w_mask[63-47:64-42].eq(Repl(1, 6)),
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self.pfv.srr1.w_data[63-47:64-42].eq(0),
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_msr_to_srr1( 0, 32),
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_msr_to_srr1(37, 41),
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_msr_to_srr1(48, 63),
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self.pfv.intr.eq(1),
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self.pfv.nia .eq(0xc00),
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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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