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authorMitch Hayenga <mitch.hayenga@arm.com>2015-09-30 11:14:19 -0500
committerMitch Hayenga <mitch.hayenga@arm.com>2015-09-30 11:14:19 -0500
commitccf4f6c3d7616c546d78eb21d22ebda812b5e2bb (patch)
tree08581c6baa40737335733f39d4bab87611ddccee
parent9e07a7504c94973e7837d1d3e96dbdb8d95cfad3 (diff)
downloadgem5-ccf4f6c3d7616c546d78eb21d22ebda812b5e2bb.tar.xz
arm: Change TLB Software Caching
In ARM, certain variables are only updated when a necessary change is detected. Having 2 SMT threads share a TLB resulted in these not being updated as required. This patch adds a thread context identifer to assist in the invalidation of these variables.
-rw-r--r--src/arch/arm/tlb.cc6
-rw-r--r--src/arch/arm/tlb.hh1
2 files changed, 5 insertions, 2 deletions
diff --git a/src/arch/arm/tlb.cc b/src/arch/arm/tlb.cc
index aee6a251a..688c0d46b 100644
--- a/src/arch/arm/tlb.cc
+++ b/src/arch/arm/tlb.cc
@@ -78,7 +78,7 @@ TLB::TLB(const ArmTLBParams *p)
stage2Mmu(NULL), rangeMRU(1),
aarch64(false), aarch64EL(EL0), isPriv(false), isSecure(false),
isHyp(false), asid(0), vmid(0), dacr(0),
- miscRegValid(false), curTranType(NormalTran)
+ miscRegValid(false), miscRegContext(0), curTranType(NormalTran)
{
tableWalker->setTlb(this);
@@ -1204,7 +1204,8 @@ TLB::updateMiscReg(ThreadContext *tc, ArmTranslationType tranType)
// check if the regs have changed, or the translation mode is different.
// NOTE: the tran type doesn't affect stage 2 TLB's as they only handle
// one type of translation anyway
- if (miscRegValid && ((tranType == curTranType) || isStage2)) {
+ if (miscRegValid && miscRegContext == tc->contextId() &&
+ ((tranType == curTranType) || isStage2)) {
return;
}
@@ -1300,6 +1301,7 @@ TLB::updateMiscReg(ThreadContext *tc, ArmTranslationType tranType)
}
}
miscRegValid = true;
+ miscRegContext = tc->contextId();
curTranType = tranType;
}
diff --git a/src/arch/arm/tlb.hh b/src/arch/arm/tlb.hh
index 63707dba2..35049db48 100644
--- a/src/arch/arm/tlb.hh
+++ b/src/arch/arm/tlb.hh
@@ -327,6 +327,7 @@ protected:
HCR hcr;
uint32_t dacr;
bool miscRegValid;
+ ContextID miscRegContext;
ArmTranslationType curTranType;
// Cached copies of system-level properties