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// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "common/scope_exit.h"
#include "core/core.h"
#include "core/hle/kernel/k_light_session.h"
#include "core/hle/kernel/k_process.h"
#include "core/hle/kernel/k_scoped_resource_reservation.h"
#include "core/hle/kernel/k_server_port.h"
#include "core/hle/kernel/k_session.h"
#include "core/hle/kernel/svc.h"
namespace Kernel::Svc {
namespace {
template <typename T>
Result CreateSession(Core::System& system, Handle* out_server, Handle* out_client, uint64_t name) {
auto& process = GetCurrentProcess(system.Kernel());
auto& handle_table = process.GetHandleTable();
// Declare the session we're going to allocate.
T* session;
// Reserve a new session from the process resource limit.
// TODO: Dynamic resource limits
KScopedResourceReservation session_reservation(std::addressof(process),
LimitableResource::SessionCountMax);
if (session_reservation.Succeeded()) {
session = T::Create(system.Kernel());
} else {
R_THROW(ResultLimitReached);
// // We couldn't reserve a session. Check that we support dynamically expanding the
// // resource limit.
// R_UNLESS(process.GetResourceLimit() ==
// std::addressof(system.Kernel().GetSystemResourceLimit()), ResultLimitReached);
// R_UNLESS(KTargetSystem::IsDynamicResourceLimitsEnabled(), ResultLimitReached());
// // Try to allocate a session from unused slab memory.
// session = T::CreateFromUnusedSlabMemory();
// R_UNLESS(session != nullptr, ResultLimitReached);
// ON_RESULT_FAILURE { session->Close(); };
// // If we're creating a KSession, we want to add two KSessionRequests to the heap, to
// // prevent request exhaustion.
// // NOTE: Nintendo checks if session->DynamicCast<KSession *>() != nullptr, but there's
// // no reason to not do this statically.
// if constexpr (std::same_as<T, KSession>) {
// for (size_t i = 0; i < 2; i++) {
// KSessionRequest* request = KSessionRequest::CreateFromUnusedSlabMemory();
// R_UNLESS(request != nullptr, ResultLimitReached);
// request->Close();
// }
// }
// We successfully allocated a session, so add the object we allocated to the resource
// limit.
// system.Kernel().GetSystemResourceLimit().Reserve(LimitableResource::SessionCountMax, 1);
}
// Check that we successfully created a session.
R_UNLESS(session != nullptr, ResultOutOfResource);
// Initialize the session.
session->Initialize(nullptr, name);
// Commit the session reservation.
session_reservation.Commit();
// Ensure that we clean up the session (and its only references are handle table) on function
// end.
SCOPE_EXIT({
session->GetClientSession().Close();
session->GetServerSession().Close();
});
// Register the session.
T::Register(system.Kernel(), session);
// Add the server session to the handle table.
R_TRY(handle_table.Add(out_server, std::addressof(session->GetServerSession())));
// Ensure that we maintain a clean handle state on exit.
ON_RESULT_FAILURE {
handle_table.Remove(*out_server);
};
// Add the client session to the handle table.
R_RETURN(handle_table.Add(out_client, std::addressof(session->GetClientSession())));
}
} // namespace
Result CreateSession(Core::System& system, Handle* out_server, Handle* out_client, bool is_light,
u64 name) {
if (is_light) {
R_RETURN(CreateSession<KLightSession>(system, out_server, out_client, name));
} else {
R_RETURN(CreateSession<KSession>(system, out_server, out_client, name));
}
}
Result AcceptSession(Core::System& system, Handle* out, Handle port_handle) {
// Get the current handle table.
auto& handle_table = GetCurrentProcess(system.Kernel()).GetHandleTable();
// Get the server port.
KScopedAutoObject port = handle_table.GetObject<KServerPort>(port_handle);
R_UNLESS(port.IsNotNull(), ResultInvalidHandle);
// Reserve an entry for the new session.
R_TRY(handle_table.Reserve(out));
ON_RESULT_FAILURE {
handle_table.Unreserve(*out);
};
// Accept the session.
KAutoObject* session;
if (port->IsLight()) {
session = port->AcceptLightSession();
} else {
session = port->AcceptSession();
}
// Ensure we accepted successfully.
R_UNLESS(session != nullptr, ResultNotFound);
// Register the session.
handle_table.Register(*out, session);
session->Close();
R_SUCCEED();
}
Result CreateSession64(Core::System& system, Handle* out_server_session_handle,
Handle* out_client_session_handle, bool is_light, uint64_t name) {
R_RETURN(CreateSession(system, out_server_session_handle, out_client_session_handle, is_light,
name));
}
Result AcceptSession64(Core::System& system, Handle* out_handle, Handle port) {
R_RETURN(AcceptSession(system, out_handle, port));
}
Result CreateSession64From32(Core::System& system, Handle* out_server_session_handle,
Handle* out_client_session_handle, bool is_light, uint32_t name) {
R_RETURN(CreateSession(system, out_server_session_handle, out_client_session_handle, is_light,
name));
}
Result AcceptSession64From32(Core::System& system, Handle* out_handle, Handle port) {
R_RETURN(AcceptSession(system, out_handle, port));
}
} // namespace Kernel::Svc
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