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authorAndreas Sandberg <Andreas.Sandberg@ARM.com>2013-01-07 13:05:48 -0500
committerAndreas Sandberg <Andreas.Sandberg@ARM.com>2013-01-07 13:05:48 -0500
commite09e9fa279dec86b171b5e3efeb7057fa0d21cc9 (patch)
tree81fe4595ffa298f566a595caa54d5166c9bc09af /src/arch/sparc
parent964aa49d1523787c06491453a85fad511b0a5883 (diff)
downloadgem5-e09e9fa279dec86b171b5e3efeb7057fa0d21cc9.tar.xz
cpu: Flush TLBs on switchOut()
This changeset inserts a TLB flush in BaseCPU::switchOut to prevent stale translations when doing repeated switching. Additionally, the TLB flushing functionality is exported to the Python to make debugging of switching/checkpointing easier. A simulation script will typically use the TLB flushing functionality to generate a reference trace. The following sequence can be used to simulate a handover (this depends on how drain is implemented, but is generally the case) between identically configured CPU models: m5.drain(test_sys) [ cpu.flushTLBs() for cpu in test_sys.cpu ] m5.resume(test_sys) The generated trace should normally be identical to a trace generated when switching between identically configured CPU models or checkpointing and resuming.
Diffstat (limited to 'src/arch/sparc')
-rw-r--r--src/arch/sparc/tlb.hh7
1 files changed, 4 insertions, 3 deletions
diff --git a/src/arch/sparc/tlb.hh b/src/arch/sparc/tlb.hh
index 8ed10ff0e..7246cd4f6 100644
--- a/src/arch/sparc/tlb.hh
+++ b/src/arch/sparc/tlb.hh
@@ -114,6 +114,10 @@ class TLB : public BaseTLB
*/
TlbEntry *lookup(Addr va, int partition_id, bool real, int context_id = 0,
bool update_used = true);
+
+ /** Remove all entries from the TLB */
+ void flushAll();
+
protected:
/** Insert a PTE into the TLB. */
void insert(Addr vpn, int partition_id, int context_id, bool real,
@@ -122,9 +126,6 @@ class TLB : public BaseTLB
/** Given an entry id, read that tlb entries' tag. */
uint64_t TagRead(int entry);
- /** Remove all entries from the TLB */
- void flushAll();
-
/** Remove all non-locked entries from the tlb that match partition id. */
void demapAll(int partition_id);