0b8d2ecabe
So that it doesn't have to scan over the request buffer again on reply. This also allow us to store additional info like memory mapping
107 lines
3.9 KiB
C++
107 lines
3.9 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <memory>
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#include <string>
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#include "common/assert.h"
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#include "common/common_types.h"
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#include "core/hle/kernel/ipc.h"
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#include "core/hle/kernel/object.h"
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#include "core/hle/kernel/wait_object.h"
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#include "core/hle/result.h"
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#include "core/memory.h"
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namespace Kernel {
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class ClientSession;
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class ClientPort;
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class ServerSession;
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class Session;
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class SessionRequestHandler;
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class Thread;
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/**
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* Kernel object representing the server endpoint of an IPC session. Sessions are the basic CTR-OS
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* primitive for communication between different processes, and are used to implement service calls
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* to the various system services.
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*
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* To make a service call, the client must write the command header and parameters to the buffer
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* located at offset 0x80 of the TLS (Thread-Local Storage) area, then execute a SendSyncRequest
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* SVC call with its ClientSession handle. The kernel will read the command header, using it to
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* marshall the parameters to the process at the server endpoint of the session.
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* After the server replies to the request, the response is marshalled back to the caller's
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* TLS buffer and control is transferred back to it.
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*/
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class ServerSession final : public WaitObject {
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public:
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std::string GetName() const override {
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return name;
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}
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std::string GetTypeName() const override {
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return "ServerSession";
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}
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static const HandleType HANDLE_TYPE = HandleType::ServerSession;
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HandleType GetHandleType() const override {
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return HANDLE_TYPE;
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}
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/**
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* Sets the HLE handler for the session. This handler will be called to service IPC requests
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* instead of the regular IPC machinery. (The regular IPC machinery is currently not
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* implemented.)
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*/
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void SetHleHandler(std::shared_ptr<SessionRequestHandler> hle_handler_) {
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hle_handler = std::move(hle_handler_);
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}
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/**
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* Handle a sync request from the emulated application.
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* @param thread Thread that initiated the request.
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* @returns ResultCode from the operation.
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*/
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ResultCode HandleSyncRequest(SharedPtr<Thread> thread);
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bool ShouldWait(Thread* thread) const override;
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void Acquire(Thread* thread) override;
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std::string name; ///< The name of this session (optional)
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std::shared_ptr<Session> parent; ///< The parent session, which links to the client endpoint.
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std::shared_ptr<SessionRequestHandler>
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hle_handler; ///< This session's HLE request handler (optional)
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/// List of threads that are pending a response after a sync request. This list is processed in
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/// a LIFO manner, thus, the last request will be dispatched first.
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/// TODO(Subv): Verify if this is indeed processed in LIFO using a hardware test.
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std::vector<SharedPtr<Thread>> pending_requesting_threads;
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/// Thread whose request is currently being handled. A request is considered "handled" when a
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/// response is sent via svcReplyAndReceive.
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/// TODO(Subv): Find a better name for this.
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SharedPtr<Thread> currently_handling;
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/// A temporary list holding mapped buffer info from IPC request, used for during IPC reply
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std::vector<MappedBufferContext> mapped_buffer_context;
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private:
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explicit ServerSession(KernelSystem& kernel);
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~ServerSession() override;
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/**
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* Creates a server session. The server session can have an optional HLE handler,
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* which will be invoked to handle the IPC requests that this session receives.
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* @param kernel The kernel instance to create the server session on
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* @param name Optional name of the server session.
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* @return The created server session
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*/
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static ResultVal<SharedPtr<ServerSession>> Create(KernelSystem& kernel,
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std::string name = "Unknown");
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friend class KernelSystem;
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};
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} // namespace Kernel
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