// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <array>
#include <functional>
#include <memory>
#include <optional>
#include <string>
#include <type_traits>
#include <vector>
#include <boost/container/small_vector.hpp>
#include "common/common_types.h"
#include "common/concepts.h"
#include "common/swap.h"
#include "core/hle/ipc.h"
#include "core/hle/kernel/k_auto_object.h"
union ResultCode;
namespace Core::Memory {
class Memory;
}
namespace IPC {
class ResponseBuilder;
}
namespace Service {
class ServiceFrameworkBase;
}
namespace Kernel {
class Domain;
class HandleTable;
class HLERequestContext;
class KernelCore;
class Process;
class KServerSession;
class KThread;
class KReadableEvent;
class KSession;
class KWritableEvent;
enum class ThreadWakeupReason;
/**
* Interface implemented by HLE Session handlers.
* This can be provided to a ServerSession in order to hook into several relevant events
* (such as a new connection or a SyncRequest) so they can be implemented in the emulator.
*/
class SessionRequestHandler : public std::enable_shared_from_this<SessionRequestHandler> {
public:
SessionRequestHandler();
virtual ~SessionRequestHandler();
/**
* Handles a sync request from the emulated application.
* @param server_session The ServerSession that was triggered for this sync request,
* it should be used to differentiate which client (As in ClientSession) we're answering to.
* TODO(Subv): Use a wrapper structure to hold all the information relevant to
* this request (ServerSession, Originator thread, Translated command buffer, etc).
* @returns ResultCode the result code of the translate operation.
*/
virtual ResultCode HandleSyncRequest(Kernel::HLERequestContext& context) = 0;
/**
* Signals that a client has just connected to this HLE handler and keeps the
* associated ServerSession alive for the duration of the connection.
* @param server_session Owning pointer to the ServerSession associated with the connection.
*/
void ClientConnected(KServerSession* session);
/**
* Signals that a client has just disconnected from this HLE handler and releases the
* associated ServerSession.
* @param server_session ServerSession associated with the connection.
*/
void ClientDisconnected(KServerSession* session);
};
/**
* Class containing information about an in-flight IPC request being handled by an HLE service
* implementation. Services should avoid using old global APIs (e.g. Kernel::GetCommandBuffer()) and
* when possible use the APIs in this class to service the request.
*
* HLE handle protocol
* ===================
*
* To avoid needing HLE services to keep a separate handle table, or having to directly modify the
* requester's table, a tweaked protocol is used to receive and send handles in requests. The kernel
* will decode the incoming handles into object pointers and insert a id in the buffer where the
* handle would normally be. The service then calls GetIncomingHandle() with that id to get the
* pointer to the object. Similarly, instead of inserting a handle into the command buffer, the
* service calls AddOutgoingHandle() and stores the returned id where the handle would normally go.
*
* The end result is similar to just giving services their own real handle tables, but since these
* ids are local to a specific context, it avoids requiring services to manage handles for objects
* across multiple calls and ensuring that unneeded handles are cleaned up.
*/
class HLERequestContext {
public:
explicit HLERequestContext(KernelCore& kernel, Core::Memory::Memory& memory,
KServerSession* session, KThread* thread);
~HLERequestContext();
/// Returns a pointer to the IPC command buffer for this request.
u32* CommandBuffer() {
return cmd_buf.data();
}
/**
* Returns the session through which this request was made. This can be used as a map key to
* access per-client data on services.
*/
Kernel::KServerSession* Session() {
return server_session;
}
/// Populates this context with data from the requesting process/thread.
ResultCode PopulateFromIncomingCommandBuffer(const HandleTable& handle_table,
u32_le* src_cmdbuf);
/// Writes data from this context back to the requesting process/thread.
ResultCode WriteToOutgoingCommandBuffer(KThread& thread);
u32_le GetCommand() const {
return command;
}
IPC::CommandType GetCommandType() const {
return command_header->type;
}
unsigned GetDataPayloadOffset() const {
return data_payload_offset;
}
const std::vector<IPC::BufferDescriptorX>& BufferDescriptorX() const {
return buffer_x_desciptors;
}
const std::vector<IPC::BufferDescriptorABW>& BufferDescriptorA() const {
return buffer_a_desciptors;
}
const std::vector<IPC::BufferDescriptorABW>& BufferDescriptorB() const {
return buffer_b_desciptors;
}
const std::vector<IPC::BufferDescriptorC>& BufferDescriptorC() const {
return buffer_c_desciptors;
}
const IPC::DomainMessageHeader& GetDomainMessageHeader() const {
return domain_message_header.value();
}
bool HasDomainMessageHeader() const {
return domain_message_header.has_value();
}
/// Helper function to read a buffer using the appropriate buffer descriptor
std::vector<u8> ReadBuffer(std::size_t buffer_index = 0) const;
/// Helper function to write a buffer using the appropriate buffer descriptor
std::size_t WriteBuffer(const void* buffer, std::size_t size,
std::size_t buffer_index = 0) const;
/* Helper function to write a buffer using the appropriate buffer descriptor
*
* @tparam T an arbitrary container that satisfies the
* ContiguousContainer concept in the C++ standard library or a trivially copyable type.
*
* @param data The container/data to write into a buffer.
* @param buffer_index The buffer in particular to write to.
*/
template <typename T, typename = std::enable_if_t<!std::is_pointer_v<T>>>
std::size_t WriteBuffer(const T& data, std::size_t buffer_index = 0) const {
if constexpr (Common::IsSTLContainer<T>) {
using ContiguousType = typename T::value_type;
static_assert(std::is_trivially_copyable_v<ContiguousType>,
"Container to WriteBuffer must contain trivially copyable objects");
return WriteBuffer(std::data(data), std::size(data) * sizeof(ContiguousType),
buffer_index);
} else {
static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable");
return WriteBuffer(&data, sizeof(T), buffer_index);
}
}
/// Helper function to get the size of the input buffer
std::size_t GetReadBufferSize(std::size_t buffer_index = 0) const;
/// Helper function to get the size of the output buffer
std::size_t GetWriteBufferSize(std::size_t buffer_index = 0) const;
/// Helper function to test whether the input buffer at buffer_index can be read
bool CanReadBuffer(std::size_t buffer_index = 0) const;
/// Helper function to test whether the output buffer at buffer_index can be written
bool CanWriteBuffer(std::size_t buffer_index = 0) const;
Handle GetCopyHandle(std::size_t index) const {
return copy_handles.at(index);
}
Handle GetMoveHandle(std::size_t index) const {
return move_handles.at(index);
}
void AddMoveObject(KAutoObject* object) {
move_objects.emplace_back(object);
}
void AddCopyObject(KAutoObject* object) {
copy_objects.emplace_back(object);
}
void AddDomainObject(std::shared_ptr<SessionRequestHandler> object) {
domain_objects.emplace_back(std::move(object));
}
template <typename T>
std::shared_ptr<T> GetDomainRequestHandler(std::size_t index) const {
return std::static_pointer_cast<T>(domain_request_handlers.at(index));
}
void SetDomainRequestHandlers(
const std::vector<std::shared_ptr<SessionRequestHandler>>& handlers) {
domain_request_handlers = handlers;
}
/// Clears the list of objects so that no lingering objects are written accidentally to the
/// response buffer.
void ClearIncomingObjects() {
move_objects.clear();
copy_objects.clear();
domain_objects.clear();
}
std::size_t NumMoveObjects() const {
return move_objects.size();
}
std::size_t NumCopyObjects() const {
return copy_objects.size();
}
std::size_t NumDomainObjects() const {
return domain_objects.size();
}
std::string Description() const;
KThread& GetThread() {
return *thread;
}
bool IsThreadWaiting() const {
return is_thread_waiting;
}
private:
friend class IPC::ResponseBuilder;
void ParseCommandBuffer(const HandleTable& handle_table, u32_le* src_cmdbuf, bool incoming);
std::array<u32, IPC::COMMAND_BUFFER_LENGTH> cmd_buf;
Kernel::KServerSession* server_session{};
KThread* thread;
// TODO(yuriks): Check common usage of this and optimize size accordingly
boost::container::small_vector<Handle, 8> move_handles;
boost::container::small_vector<Handle, 8> copy_handles;
boost::container::small_vector<KAutoObject*, 8> move_objects;
boost::container::small_vector<KAutoObject*, 8> copy_objects;
boost::container::small_vector<std::shared_ptr<SessionRequestHandler>, 8> domain_objects;
std::optional<IPC::CommandHeader> command_header;
std::optional<IPC::HandleDescriptorHeader> handle_descriptor_header;
std::optional<IPC::DataPayloadHeader> data_payload_header;
std::optional<IPC::DomainMessageHeader> domain_message_header;
std::vector<IPC::BufferDescriptorX> buffer_x_desciptors;
std::vector<IPC::BufferDescriptorABW> buffer_a_desciptors;
std::vector<IPC::BufferDescriptorABW> buffer_b_desciptors;
std::vector<IPC::BufferDescriptorABW> buffer_w_desciptors;
std::vector<IPC::BufferDescriptorC> buffer_c_desciptors;
unsigned data_payload_offset{};
unsigned buffer_c_offset{};
u32_le command{};
std::vector<std::shared_ptr<SessionRequestHandler>> domain_request_handlers;
bool is_thread_waiting{};
KernelCore& kernel;
Core::Memory::Memory& memory;
};
} // namespace Kernel
