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-rw-r--r--src/arch/alpha/tlb.cc10
1 files changed, 8 insertions, 2 deletions
diff --git a/src/arch/alpha/tlb.cc b/src/arch/alpha/tlb.cc
index 77bf5e285..4f960360e 100644
--- a/src/arch/alpha/tlb.cc
+++ b/src/arch/alpha/tlb.cc
@@ -116,7 +116,7 @@ TLB::lookup(Addr vpn, uint8_t asn)
Fault
-TLB::checkCacheability(RequestPtr &req)
+TLB::checkCacheability(RequestPtr &req, bool itb)
{
// in Alpha, cacheability is controlled by upper-level bits of the
// physical address
@@ -148,6 +148,12 @@ TLB::checkCacheability(RequestPtr &req)
req->setPaddr(req->getPaddr() & PAddrUncachedMask);
#endif
}
+ // We shouldn't be able to read from an uncachable address in Alpha as
+ // we don't have a ROM and we don't want to try to fetch from a device
+ // register as we destroy any data that is clear-on-read.
+ if (req->isUncacheable() && itb)
+ return new UnimpFault("CPU trying to fetch from uncached I/O");
+
}
return NoFault;
}
@@ -390,7 +396,7 @@ ITB::translate(RequestPtr &req, ThreadContext *tc)
if (req->getPaddr() & ~PAddrImplMask)
return genMachineCheckFault();
- return checkCacheability(req);
+ return checkCacheability(req, true);
}