* * *

mem: support for gpu-style RMWs in ruby

This patch adds support for GPU-style read-modify-write (RMW) operations in
ruby. Such atomic operations are traditionally executed at the memory controller
(instead of through an L1 cache using cache-line locking).

Currently, this patch works by propogating operation functors through the memory
system.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/base/types.hh b/src/base/types.hh
index bc5c715ce..7b115901a 100644
--- a/src/base/types.hh
+++ b/src/base/types.hh
@@ -200,6 +200,19 @@ typedef std::shared_ptr<FaultBase> Fault;
 constexpr decltype(nullptr) NoFault = nullptr;
 #endif
 
+struct AtomicOpFunctor
+{
+    virtual void operator()(uint8_t *p) = 0;
+    virtual ~AtomicOpFunctor() {}
+};
+
+template <class T>
+struct TypedAtomicOpFunctor : public AtomicOpFunctor
+{
+    void operator()(uint8_t *p) { execute((T *)p); }
+    virtual void execute(T * p) = 0;
+};
+
 enum ByteOrder {
     BigEndianByteOrder,
     LittleEndianByteOrder