dev, pci: Implement basic VirtIO support

This patch adds support for VirtIO over the PCI bus. It does so by
providing the following new SimObjects:

 * VirtIODeviceBase - Abstract base class for VirtIO devices.
 * PciVirtIO - VirtIO PCI transport interface.

A VirtIO device is hooked up to the guest system by adding a PciVirtIO
device to the PCI bus and connecting it to a VirtIO device using the
vio parameter.

New VirtIO devices should inherit from VirtIODevice base and
implementing one or more VirtQueues. The VirtQueues are usually
device-specific and all derive from the VirtQueue class. Queues must
be registered with the base class from the constructor since the
device assumes that the number of queues stay constant.

1 files changed, 89 insertions, 0 deletions

diff --git a/src/dev/virtio/pci.hh b/src/dev/virtio/pci.hh
new file mode 100644
index 000000000..be5a140e2
--- /dev/null
+++ b/src/dev/virtio/pci.hh
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2014 ARM Limited
+ * All rights reserved
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder.  You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
+ * 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: Andreas Sandberg
+ */
+
+#ifndef __DEV_VIRTIO_PCI_HH__
+#define __DEV_VIRTIO_PCI_HH__
+
+#include "base/statistics.hh"
+#include "dev/virtio/base.hh"
+#include "dev/pcidev.hh"
+
+struct PciVirtIOParams;
+
+class PciVirtIO : public PciDevice
+{
+  public:
+    typedef PciVirtIOParams Params;
+    PciVirtIO(const Params *params);
+    virtual ~PciVirtIO();
+
+    Tick read(PacketPtr pkt);
+    Tick write(PacketPtr pkt);
+
+    void kick();
+
+  protected:
+    /** @{ */
+    /** Offsets into VirtIO header (BAR0 relative). */
+
+    static const Addr OFF_DEVICE_FEATURES = 0x00;
+    static const Addr OFF_GUEST_FEATURES = 0x04;
+    static const Addr OFF_QUEUE_ADDRESS = 0x08;
+    static const Addr OFF_QUEUE_SIZE = 0x0C;
+    static const Addr OFF_QUEUE_SELECT = 0x0E;
+    static const Addr OFF_QUEUE_NOTIFY = 0x10;
+    static const Addr OFF_DEVICE_STATUS = 0x12;
+    static const Addr OFF_ISR_STATUS = 0x13;
+    static const Addr OFF_VIO_DEVICE = 0x14;
+
+    /** @} */
+
+    static const Addr BAR0_SIZE_BASE = OFF_VIO_DEVICE;
+
+
+    VirtIODeviceBase::QueueID queueNotify;
+
+    bool interruptDeliveryPending;
+
+    VirtIODeviceBase &vio;
+
+    MakeCallback<PciVirtIO, &PciVirtIO::kick> callbackKick;
+};
+
+#endif // __DEV_VIRTIO_PCI_HH__