ba00d7449d
VirtIO transport interfaces always expect a VirtIO device pointer. However, there are cases (in particular when using VirtIO's MMIO interface) where we want to instantiate an interface without a device. Add a dummy device using VirtIO device ID 0 and no queues to handle this use case. Change-Id: I6cbe12fd403903ef585be40279c3b1321fde48ff Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-by: Sudhanshu Jha <sudhanshu.jha@arm.com> Reviewed-by: Rekai Gonzalez Alberquilla <rekai.gonzalezalberquilla@arm.com> Reviewed-on: https://gem5-review.googlesource.com/2325 Reviewed-by: Weiping Liao <weipingliao@google.com> Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
75 lines
3 KiB
Python
75 lines
3 KiB
Python
# -*- mode:python -*-
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# Copyright (c) 2014, 2016 ARM Limited
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# All rights reserved.
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#
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# The license below extends only to copyright in the software and shall
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# not be construed as granting a license to any other intellectual
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# property including but not limited to intellectual property relating
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# to a hardware implementation of the functionality of the software
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# licensed hereunder. You may use the software subject to the license
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# terms below provided that you ensure that this notice is replicated
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# unmodified and in its entirety in all distributions of the software,
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# modified or unmodified, in source code or in binary form.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# Authors: Andreas Sandberg
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from m5.SimObject import SimObject
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from m5.params import *
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from m5.proxy import *
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from Device import PioDevice
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from PciDevice import PciDevice
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class VirtIODeviceBase(SimObject):
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type = 'VirtIODeviceBase'
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cxx_header = 'dev/virtio/base.hh'
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abstract = True
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subsystem = Param.UInt8(0x00, "VirtIO subsystem ID")
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system = Param.System(Parent.any, "system object")
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class VirtIODummyDevice(VirtIODeviceBase):
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type = 'VirtIODummyDevice'
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cxx_header = 'dev/virtio/base.hh'
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class PciVirtIO(PciDevice):
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type = 'PciVirtIO'
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cxx_header = 'dev/virtio/pci.hh'
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vio = Param.VirtIODeviceBase(VirtIODummyDevice(), "VirtIO device")
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VendorID = 0x1AF4
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SubsystemVendorID = VendorID;
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DeviceID = 0x1000
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ClassCode = 0xff # Misc device
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BAR0 = 0x00000001 # Anywhere in 32-bit space; IOREG
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BAR0Size = '0B' # Overridden by the device model
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InterruptPin = 0x01 # Use #INTA
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