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X86: Implement an wrdh microop which loads bases/offsets from 16 byte descriptors.

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Gabe Black 2008-10-12 22:16:53 -07:00
parent 989fa4fc0f
commit 961b40cdb5
1 changed files with 28 additions and 0 deletions
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28
src/arch/x86/isa/microops/regop.isa
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@ -236,6 +236,15 @@ output header {{
SegNoCheck, SegCSCheck, SegCallGateCheck, SegIntGateCheck,
SegSSCheck, SegIretCheck, SegIntCSCheck
};
enum LongModeDescriptorType {
LDT64 = 2,
AvailableTSS64 = 9,
BusyTSS64 = 0xb,
CallGate64 = 0xc,
IntGate64 = 0xe,
TrapGate64 = 0xf
};
}};
output decoder {{
@ -1098,7 +1107,26 @@ let {{
class Wrdh(RegOp):
code = '''
SegDescriptor desc = SrcReg1;
uint64_t target = bits(SrcReg2, 31, 0) << 32;
switch(desc.type) {
case LDT64:
case AvailableTSS64:
case BusyTSS64:
replaceBits(target, 23, 0, desc.baseLow);
replaceBits(target, 31, 24, desc.baseHigh);
break;
case CallGate64:
case IntGate64:
case TrapGate64:
replaceBits(target, 15, 0, bits(desc, 15, 0));
replaceBits(target, 31, 16, bits(desc, 63, 48));
break;
default:
panic("Wrdh used with wrong descriptor type!\\n");
}
DestReg = target;
'''
class Wrtsc(WrRegOp):