6687265fe2
Change-Id: Icfba8e23b5f6820a6ddefe1a50abbe5f8825b7b5 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/25444 Maintainer: Gabe Black <gabeblack@google.com> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
125 lines
4.6 KiB
C++
125 lines
4.6 KiB
C++
/*
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* Copyright (c) 2015 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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#ifndef __CPU_KVM_DEVICE_HH__
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#define __CPU_KVM_DEVICE_HH__
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#include <cstdint>
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/**
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* KVM device wrapper
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*
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* This is a wrapper around a device emulated by KVM. Such devices can
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* be created using KvmVM::createDevice() API. They are typically used
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* for in-kernel interrupt controllers and similar devices.
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*
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* Each device has a device-specific set of attributes which are
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* mapped into groups. The available attributes are described in the
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* device's documentation in the kernel source tree
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* (Documentation/virtual/kvm/devices/). Each attribute can be
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* accessed with the getAttr() and setAttr() access methods. The
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* presence of an attribute can be queried using the hasAttr() method.
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*/
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class KvmDevice
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{
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public:
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KvmDevice(int fd);
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virtual ~KvmDevice();
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public:
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/**
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* Get the value of an attribute
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*
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* See KVM's documentation, and specifically the device-specific
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* documentation, for available attributes and attribute groups.
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*
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* @param group Attribute group
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* @param attr Attribute ID within group
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* @return Attribute value
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*/
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template<typename T>
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T getAttr(uint32_t group, uint64_t attr) const {
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T data;
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getAttrPtr(group, attr, &data);
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return data;
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}
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/**
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* Get the value of an attribute
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*
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* See KVM's documentation, and specifically the device-specific
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* documentation, for available attributes and attribute groups.
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*
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* @param group Attribute group
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* @param attr Attribute ID within group
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* @return Attribute value
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*/
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template<typename T>
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void setAttr(uint32_t group, uint64_t attr, const T &data) const {
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setAttrPtr(group, attr, &data);
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}
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void getAttrPtr(uint32_t group, uint64_t attr, void *data) const;
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void setAttrPtr(uint32_t group, uint64_t attr, const void *data) const;
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/**
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* Check if a device attribute is valid
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*
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* See KVM's documentation, and specifically the device-specific
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* documentation, for available attributes and attribute groups.
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*
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* @param group Attribute group
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* @param attr Attribute ID within group
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* @return true if attribute is valid, false otherwise.
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*/
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bool hasAttr(uint32_t group, uint64_t attr) const;
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protected:
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int ioctl(int request, long p1) const;
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int ioctl(int request, void *p1) const {
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return ioctl(request, (long)p1);
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}
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int ioctl(int request) const {
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return ioctl(request, 0L);
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}
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private:
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int fd;
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};
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#endif // __CPU_KVM_DEVICE_HH__
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