[driver] added driver source code from isaac repository

lib/driver/buffer.cpp

@@ -0,0 +1,60 @@
+/* Copyright 2015-2017 Philippe Tillet
+*
+* Permission is hereby granted, free of charge, to any person obtaining
+* a copy of this software and associated documentation files
+* (the "Software"), to deal in the Software without restriction,
+* including without limitation the rights to use, copy, modify, merge,
+* publish, distribute, sublicense, and/or sell copies of the Software,
+* and to permit persons to whom the Software is furnished to do so,
+* subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be
+* included in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include <iostream>
+#include "driver/stream.h"
+#include "driver/buffer.h"
+#include "driver/context.h"
+#include "driver/dispatch.h"
+
+
+namespace tdl
+{
+
+namespace driver
+{
+
+Buffer::Buffer(Context const & context, size_t size) : context_(context)
+{
+  ContextSwitcher ctx_switch(context_);
+  dispatch::cuMemAlloc(&*cu_, size);
+}
+
+Buffer::Buffer(Context const & context, CUdeviceptr cu, bool take_ownership):
+  context_(context), cu_(cu, take_ownership)
+{ }
+
+void Buffer::set_zero(Stream const & queue, size_t size)
+{
+  ContextSwitcher ctx_switch(context_);
+  dispatch::cuMemsetD8Async(*cu_, 0, size, queue);
+}
+
+Handle<CUdeviceptr> const & Buffer::cu() const
+{ return cu_; }
+
+Handle<CUdeviceptr> & Buffer::cu()
+{ return cu_; }
+
+}
+
+}