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diff --git a/src/dev/arm/vio_mmio.cc b/src/dev/arm/vio_mmio.cc
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+/*
+ * Copyright (c) 2016-2018 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
+ */
+
+#include "dev/arm/vio_mmio.hh"
+
+#include "debug/VIOIface.hh"
+#include "dev/arm/base_gic.hh"
+#include "mem/packet_access.hh"
+#include "params/MmioVirtIO.hh"
+
+MmioVirtIO::MmioVirtIO(const MmioVirtIOParams *params)
+ : BasicPioDevice(params, params->pio_size),
+ hostFeaturesSelect(0), guestFeaturesSelect(0), pageSize(0),
+ interruptStatus(0),
+ callbackKick(this), vio(*params->vio), interrupt(params->interrupt)
+{
+ fatal_if(!interrupt, "No MMIO VirtIO interrupt specified\n");
+
+ vio.registerKickCallback(&callbackKick);
+}
+
+MmioVirtIO::~MmioVirtIO()
+{
+}
+
+Tick
+MmioVirtIO::read(PacketPtr pkt)
+{
+ const Addr offset = pkt->getAddr() - pioAddr;
+ const unsigned size(pkt->getSize());
+
+ DPRINTF(VIOIface, "Reading %u bytes @ 0x%x:\n", size, offset);
+
+ // Forward device configuration writes to the device VirtIO model
+ if (offset >= OFF_CONFIG) {
+ vio.readConfig(pkt, offset - OFF_CONFIG);
+ return 0;
+ }
+
+ panic_if(size != 4, "Unexpected read size: %u\n", size);
+
+ const uint32_t value = read(offset);
+ DPRINTF(VIOIface, " value: 0x%x\n", value);
+ pkt->makeResponse();
+ pkt->set<uint32_t>(value);
+
+ return 0;
+}
+
+uint32_t
+MmioVirtIO::read(Addr offset)
+{
+ switch(offset) {
+ case OFF_MAGIC:
+ return MAGIC;
+
+ case OFF_VERSION:
+ return VERSION;
+
+ case OFF_DEVICE_ID:
+ return vio.deviceId;
+
+ case OFF_VENDOR_ID:
+ return VENDOR_ID;
+
+ case OFF_HOST_FEATURES:
+ // We only implement 32 bits of this register
+ if (hostFeaturesSelect == 0)
+ return vio.deviceFeatures;
+ else
+ return 0;
+
+ case OFF_HOST_FEATURES_SELECT:
+ return hostFeaturesSelect;
+
+ case OFF_GUEST_FEATURES:
+ // We only implement 32 bits of this register
+ if (guestFeaturesSelect == 0)
+ return vio.getGuestFeatures();
+ else
+ return 0;
+
+ case OFF_GUEST_FEATURES_SELECT:
+ return hostFeaturesSelect;
+
+ case OFF_GUEST_PAGE_SIZE:
+ return pageSize;
+
+ case OFF_QUEUE_SELECT:
+ return vio.getQueueSelect();
+
+ case OFF_QUEUE_NUM_MAX:
+ return vio.getQueueSize();
+
+ case OFF_QUEUE_NUM:
+ // TODO: We don't support queue resizing, so ignore this for now.
+ return vio.getQueueSize();
+
+ case OFF_QUEUE_ALIGN:
+ // TODO: Implement this once we support other alignment sizes
+ return VirtQueue::ALIGN_SIZE;
+
+ case OFF_QUEUE_PFN:
+ return vio.getQueueAddress();
+
+ case OFF_INTERRUPT_STATUS:
+ return interruptStatus;
+
+ case OFF_STATUS:
+ return vio.getDeviceStatus();
+
+ // Write-only registers
+ case OFF_QUEUE_NOTIFY:
+ case OFF_INTERRUPT_ACK:
+ warn("Guest is trying to read to write-only register 0x%\n",
+ offset);
+ return 0;
+
+ default:
+ panic("Unhandled read offset (0x%x)\n", offset);
+ }
+}
+
+Tick
+MmioVirtIO::write(PacketPtr pkt)
+{
+ const Addr offset = pkt->getAddr() - pioAddr;
+ const unsigned size(pkt->getSize());
+
+ DPRINTF(VIOIface, "Writing %u bytes @ 0x%x:\n", size, offset);
+
+ // Forward device configuration writes to the device VirtIO model
+ if (offset >= OFF_CONFIG) {
+ vio.writeConfig(pkt, offset - OFF_CONFIG);
+ return 0;
+ }
+
+ panic_if(size != 4, "Unexpected write size @ 0x%x: %u\n", offset, size);
+ DPRINTF(VIOIface, " value: 0x%x\n", pkt->get<uint32_t>());
+ pkt->makeResponse();
+ write(offset, pkt->get<uint32_t>());
+ return 0;
+}
+
+void
+MmioVirtIO::write(Addr offset, uint32_t value)
+{
+ switch(offset) {
+ case OFF_HOST_FEATURES_SELECT:
+ hostFeaturesSelect = value;
+ return;
+
+ case OFF_GUEST_FEATURES:
+ if (guestFeaturesSelect == 0) {
+ vio.setGuestFeatures(value);
+ } else if (value != 0) {
+ warn("Setting unimplemented guest features register %u: %u\n",
+ guestFeaturesSelect, value);
+ }
+ return;
+
+ case OFF_GUEST_FEATURES_SELECT:
+ guestFeaturesSelect = value;
+ return;
+
+ case OFF_GUEST_PAGE_SIZE:
+ // TODO: We only support 4096 byte pages at the moment
+ panic_if(value != VirtQueue::ALIGN_SIZE,
+ "Unhandled VirtIO page size: %u", value);
+ pageSize = value;
+ return;
+
+ case OFF_QUEUE_SELECT:
+ vio.setQueueSelect(value);
+ return;
+
+ case OFF_QUEUE_NUM:
+ // TODO: We don't support queue resizing, so ignore this for now.
+ warn_once("Ignoring queue resize hint. Requested size: %u\n", value);
+ return;
+
+ case OFF_QUEUE_ALIGN:
+ // TODO: We currently only support the hard-coded 4k alignment used
+ // in legacy VirtIO.
+ panic_if(value != VirtQueue::ALIGN_SIZE,
+ "Unhandled VirtIO alignment size: %u", value);
+ return;
+
+ case OFF_QUEUE_PFN:
+ vio.setQueueAddress(value);
+ return;
+
+ case OFF_QUEUE_NOTIFY:
+ vio.onNotify(value);
+ return;
+
+ case OFF_INTERRUPT_ACK:
+ setInterrupts(interruptStatus & (~value));
+ return;
+
+ case OFF_STATUS:
+ panic_if(value > 0xff, "Unexpected status: 0x%x\n", value);
+ vio.setDeviceStatus(value);
+ return;
+
+ /* Read-only registers */
+ case OFF_MAGIC:
+ case OFF_VERSION:
+ case OFF_DEVICE_ID:
+ case OFF_VENDOR_ID:
+ case OFF_HOST_FEATURES:
+ case OFF_QUEUE_NUM_MAX:
+ case OFF_INTERRUPT_STATUS:
+ warn("Guest is trying to write to read-only register 0x%\n",
+ offset);
+ return;
+
+ default:
+ panic("Unhandled read offset (0x%x)\n", offset);
+ }
+}
+
+void
+MmioVirtIO::kick()
+{
+ DPRINTF(VIOIface, "kick(): Sending interrupt...\n");
+ setInterrupts(interruptStatus | INT_USED_RING);
+}
+
+void
+MmioVirtIO::setInterrupts(uint32_t value)
+{
+ const uint32_t old_ints = interruptStatus;
+ interruptStatus = value;
+
+ if (!old_ints && interruptStatus) {
+ interrupt->raise();
+ } else if (old_ints && !interruptStatus) {
+ interrupt->clear();
+ }
+}
+
+
+MmioVirtIO *
+MmioVirtIOParams::create()
+{
+ return new MmioVirtIO(this);
+}
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