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X86: Create an eret microop which returns from ROM to combinational decoding.

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This commit is contained in:
Gabe Black 2008-10-12 15:53:04 -07:00
parent 4aa18aa800
commit 6fd4eff68f
1 changed files with 33 additions and 0 deletions
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33
src/arch/x86/isa/microops/seqop.isa
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@ -198,6 +198,25 @@ let {{
microFlags = (is_micro, is_delayed, is_first, is_last)
return super(Br, self).getAllocator(*microFlags)
class Eret(SeqOp):
target = "normalMicroPC(0)"
className = "Eret"
def __init__(self, flags=None):
if flags:
if not isinstance(flags, (list, tuple)):
raise Exception, "flags must be a list or tuple of flags"
self.cond = " | ".join(flags)
self.className += "Flags"
else:
self.cond = "0"
def getAllocator(self, *microFlags):
(is_micro, is_delayed, is_first, is_last) = microFlags
is_last = True
microFlags = (is_micro, is_delayed, is_first, is_last)
return super(Eret, self).getAllocator(*microFlags)
iop = InstObjParams("br", "MicroBranchFlags", "SeqOpBase",
{"code": "nuIP = target",
"else_code": "nuIP = nuIP",
@ -213,4 +232,18 @@ let {{
header_output += SeqOpDeclare.subst(iop)
decoder_output += SeqOpConstructor.subst(iop)
microopClasses["br"] = Br
iop = InstObjParams("eret", "EretFlags", "SeqOpBase",
{"code": "", "else_code": "",
"cond_test": "checkCondition(ccFlagBits, cc)"})
exec_output += SeqOpExecute.subst(iop)
header_output += SeqOpDeclare.subst(iop)
decoder_output += SeqOpConstructor.subst(iop)
iop = InstObjParams("eret", "Eret", "SeqOpBase",
{"code": "", "else_code": "",
"cond_test": "true"})
exec_output += SeqOpExecute.subst(iop)
header_output += SeqOpDeclare.subst(iop)
decoder_output += SeqOpConstructor.subst(iop)
microopClasses["eret"] = Eret
}};