X86: Add a dummy minimal DMA controller that doesn't do anything.

1 files changed, 66 insertions, 0 deletions

diff --git a/src/dev/x86/i8237.hh b/src/dev/x86/i8237.hh
new file mode 100644
index 000000000..2d73b8ab5
--- /dev/null
+++ b/src/dev/x86/i8237.hh
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2008 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Gabe Black
+ */
+
+#ifndef __DEV_X86_I8237_HH__
+#define __DEV_X86_I8237_HH__
+
+#include "dev/io_device.hh"
+#include "params/I8237.hh"
+
+namespace X86ISA
+{
+
+class I8237 : public BasicPioDevice
+{
+  protected:
+    Tick latency;
+    uint8_t maskReg;
+
+  public:
+    typedef I8237Params Params;
+
+    const Params *
+    params() const
+    {
+        return dynamic_cast<const Params *>(_params);
+    }
+
+    I8237(Params *p) : BasicPioDevice(p), latency(p->pio_latency), maskReg(0)
+    {
+        pioSize = 16;
+    }
+    Tick read(PacketPtr pkt);
+
+    Tick write(PacketPtr pkt);
+};
+
+}; // namespace X86ISA
+
+#endif //__DEV_X86_I8237_HH__