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X86: Make some of the bits of CR0 do what they're supposed to.

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--HG--
extra : convert_revision : 13e79ef1ef09bd842d5e075e31f98ab2a4357901
This commit is contained in:
Gabe Black
2007-11-12 14:38:02 -08:00
parent aaa30714b3
commit d89d80a5d0
1 changed files with 24 additions and 1 deletions
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25
src/arch/x86/miscregfile.cc
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@@ -154,7 +154,30 @@ void MiscRegFile::setRegNoEffect(int miscReg, const MiscReg &val)
void MiscRegFile::setReg(int miscReg,
const MiscReg &val, ThreadContext * tc)
{
setRegNoEffect(miscReg, val);
MiscReg newVal = val;
switch(miscReg)
{
case MISCREG_CR0:
CR0 toggled = regVal[miscReg] ^ val;
CR0 newCR0 = val;
Efer efer = regVal[MISCREG_EFER];
if (toggled.pg && efer.lme) {
if (newCR0.pg) {
//Turning on long mode
efer.lma = 1;
regVal[MISCREG_EFER] = efer;
} else {
//Turning off long mode
efer.lma = 0;
regVal[MISCREG_EFER] = efer;
}
}
//This must always be 1.
newCR0.et = 1;
newVal = newCR0;
break;
}
setRegNoEffect(miscReg, newVal);
}
void MiscRegFile::serialize(std::ostream & os)