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X86: Use the HandyM5Reg to avoid a register read and some logic in the TLB.

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Gabe Black
2012-05-28 21:56:23 -07:00
parent f91b06e20e
commit d9988ded3c
1 changed files with 3 additions and 8 deletions
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11
src/arch/x86/tlb.cc
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@@ -269,15 +269,10 @@ TLB::translate(RequestPtr req, ThreadContext *tc, Translation *translation,
}
Addr base = tc->readMiscRegNoEffect(MISCREG_SEG_BASE(seg));
Addr limit = tc->readMiscRegNoEffect(MISCREG_SEG_LIMIT(seg));
// This assumes we're not in 64 bit mode. If we were, the default
// address size is 64 bits, overridable to 32.
int size = 32;
bool sizeOverride = (flags & (AddrSizeFlagBit << FlagShift));
SegAttr csAttr = tc->readMiscRegNoEffect(MISCREG_CS_ATTR);
if ((csAttr.defaultSize && sizeOverride) ||
(!csAttr.defaultSize && !sizeOverride))
size = 16;
Addr offset = bits(vaddr - base, size-1, 0);
int logSize = sizeOverride ? m5Reg.altAddr : m5Reg.defAddr;
int size = (1 << logSize) * 8;
Addr offset = bits(vaddr - base, size - 1, 0);
Addr endOffset = offset + req->getSize() - 1;
if (expandDown) {
DPRINTF(TLB, "Checking an expand down segment.\n");