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authorAli Saidi <Ali.Saidi@ARM.com>2010-12-07 16:19:57 -0800
committerAli Saidi <Ali.Saidi@ARM.com>2010-12-07 16:19:57 -0800
commit21bfbd422cb9d043f88bd7f5ca9d4c72b97f9f33 (patch)
tree8daca00e0dc933e7442da1eb7a017fe2be8734fe /src
parent658849d101c98b6d8c7a06f41ffbe39675848eac (diff)
downloadgem5-21bfbd422cb9d043f88bd7f5ca9d4c72b97f9f33.tar.xz
ARM: Support switchover with hardware table walkers
Diffstat (limited to 'src')
-rw-r--r--src/arch/arm/table_walker.cc3
-rw-r--r--src/arch/arm/tlb.cc12
-rw-r--r--src/arch/arm/tlb.hh3
-rw-r--r--src/cpu/base.cc21
-rw-r--r--src/sim/tlb.hh6
5 files changed, 43 insertions, 2 deletions
diff --git a/src/arch/arm/table_walker.cc b/src/arch/arm/table_walker.cc
index 98dc1760d..88f2a455f 100644
--- a/src/arch/arm/table_walker.cc
+++ b/src/arch/arm/table_walker.cc
@@ -92,8 +92,7 @@ TableWalker::getPort(const std::string &if_name, int idx)
{
if (if_name == "port") {
if (port != NULL)
- fatal("%s: port already connected to %s",
- name(), port->getPeer()->name());
+ return port;
System *sys = params()->sys;
Tick minb = params()->min_backoff;
Tick maxb = params()->max_backoff;
diff --git a/src/arch/arm/tlb.cc b/src/arch/arm/tlb.cc
index 6d6da15c8..f142e03f8 100644
--- a/src/arch/arm/tlb.cc
+++ b/src/arch/arm/tlb.cc
@@ -693,6 +693,18 @@ TLB::translateTiming(RequestPtr req, ThreadContext *tc,
return fault;
}
+Port*
+TLB::getPort()
+{
+#if FULL_SYSTEM
+ return tableWalker->getPort("port");
+#else
+ return NULL;
+#endif
+}
+
+
+
ArmISA::TLB *
ArmTLBParams::create()
{
diff --git a/src/arch/arm/tlb.hh b/src/arch/arm/tlb.hh
index 0b8bc1046..21062ea0d 100644
--- a/src/arch/arm/tlb.hh
+++ b/src/arch/arm/tlb.hh
@@ -209,6 +209,9 @@ class TLB : public BaseTLB
void regStats();
+ // Get the port from the table walker and return it
+ virtual Port *getPort();
+
// Caching misc register values here.
// Writing to misc registers needs to invalidate them.
// translateFunctional/translateSe/translateFs checks if they are
diff --git a/src/cpu/base.cc b/src/cpu/base.cc
index 556e7ec6f..e0d29577d 100644
--- a/src/cpu/base.cc
+++ b/src/cpu/base.cc
@@ -33,6 +33,7 @@
#include <string>
#include <sstream>
+#include "arch/tlb.hh"
#include "base/cprintf.hh"
#include "base/loader/symtab.hh"
#include "base/misc.hh"
@@ -359,6 +360,26 @@ BaseCPU::takeOverFrom(BaseCPU *oldCPU, Port *ic, Port *dc)
if (DTRACE(Context))
ThreadContext::compare(oldTC, newTC);
*/
+
+ Port *old_itb_port, *old_dtb_port, *new_itb_port, *new_dtb_port;
+ old_itb_port = oldTC->getITBPtr()->getPort();
+ old_dtb_port = oldTC->getDTBPtr()->getPort();
+ new_itb_port = newTC->getITBPtr()->getPort();
+ new_dtb_port = newTC->getDTBPtr()->getPort();
+
+ // Move over any table walker ports if they exist
+ if (new_itb_port && !new_itb_port->isConnected()) {
+ assert(old_itb_port);
+ Port *peer = old_itb_port->getPeer();;
+ new_itb_port->setPeer(peer);
+ peer->setPeer(new_itb_port);
+ }
+ if (new_dtb_port && !new_dtb_port->isConnected()) {
+ assert(old_dtb_port);
+ Port *peer = old_dtb_port->getPeer();;
+ new_dtb_port->setPeer(peer);
+ peer->setPeer(new_dtb_port);
+ }
}
#if FULL_SYSTEM
diff --git a/src/sim/tlb.hh b/src/sim/tlb.hh
index ddd3127e5..a3e5c22c7 100644
--- a/src/sim/tlb.hh
+++ b/src/sim/tlb.hh
@@ -38,6 +38,7 @@
class ThreadContext;
class Packet;
+class Port;
class BaseTLB : public SimObject
{
@@ -52,6 +53,11 @@ class BaseTLB : public SimObject
public:
virtual void demapPage(Addr vaddr, uint64_t asn) = 0;
+ /** Get any port that the TLB or hardware table walker needs.
+ * This is used for migrating port connections during a takeOverFrom()
+ * call. */
+ virtual Port* getPort() { return NULL; }
+
class Translation
{
public: