From d658b6e1cc22de852fef611e28f448257acc298a Mon Sep 17 00:00:00 2001
From: Tony Gutierrez <anthony.gutierrez@amd.com>
Date: Tue, 19 Jan 2016 13:57:50 -0500
Subject: * * * 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.
---
 src/base/types.hh | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src/base')

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
-- 
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