75eedb1d0b
Add an utility class that provides a service for another process
query and get the fd of the corresponding region in gem5's physmem.
Basically, the service works in this way:
1. client connect to the unix socket created by a SharedMemoryServer
2. client send a request {start, end} to gem5
3. the server locates the corresponding shared memory
4. gem5 response {offset} and pass {fd} in ancillary data
mmap fd at offset will provide the client the view into the physical
memory of the request range.
Change-Id: I9d42fd8a41fc28dcfebb45dec10bc9ebb8e21d11
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/57729
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Reviewed-by: Boris Shingarov <shingarov@labware.com>
Tested-by: kokoro <noreply+kokoro@google.com>
96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
/*
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* Copyright 2022 Google, Inc.
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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 __MEM_SHARED_MEMORY_SERVER_HH__
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#define __MEM_SHARED_MEMORY_SERVER_HH__
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#include <memory>
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#include <string>
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#include "base/pollevent.hh"
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#include "params/SharedMemoryServer.hh"
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#include "sim/sim_object.hh"
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#include "sim/system.hh"
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namespace gem5
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{
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namespace memory
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{
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class SharedMemoryServer : public SimObject
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{
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public:
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enum class RequestType : int
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{
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kGetPhysRange = 0,
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};
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explicit SharedMemoryServer(const SharedMemoryServerParams& params);
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~SharedMemoryServer();
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private:
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class BaseShmPollEvent : public PollEvent
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{
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public:
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BaseShmPollEvent(int fd, SharedMemoryServer* shm_server);
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const std::string& name() const;
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protected:
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bool tryReadAll(void* buffer, size_t size);
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SharedMemoryServer* shmServer;
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std::string eventName;
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};
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class ListenSocketEvent : public BaseShmPollEvent
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{
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public:
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using BaseShmPollEvent::BaseShmPollEvent;
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void process(int revent) override;
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};
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class ClientSocketEvent : public BaseShmPollEvent
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{
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public:
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using BaseShmPollEvent::BaseShmPollEvent;
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void process(int revent) override;
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};
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std::string unixSocketPath;
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System* system;
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int serverFd;
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std::unique_ptr<ListenSocketEvent> listenSocketEvent;
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std::unique_ptr<ClientSocketEvent> clientSocketEvent;
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};
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} // namespace memory
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} // namespace gem5
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#endif // __MEM_SHARED_MEMORY_SERVER_HH__
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