1 files changed, 89 insertions, 0 deletions
diff --git a/src/core/hle/kernel/svc/svc_ipc.cpp b/src/core/hle/kernel/svc/svc_ipc.cpp
new file mode 100644
index 000000000..dbb68e89a
--- /dev/null
+++ b/src/core/hle/kernel/svc/svc_ipc.cpp
@@ -0,0 +1,89 @@
+// 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_client_session.h"
+#include "core/hle/kernel/k_process.h"
+#include "core/hle/kernel/k_server_session.h"
+#include "core/hle/kernel/svc.h"
+
+namespace Kernel::Svc {
+
+/// Makes a blocking IPC call to a service.
+Result SendSyncRequest(Core::System& system, Handle handle) {
+    auto& kernel = system.Kernel();
+
+    // Get the client session from its handle.
+    KScopedAutoObject session =
+        kernel.CurrentProcess()->GetHandleTable().GetObject<KClientSession>(handle);
+    R_UNLESS(session.IsNotNull(), ResultInvalidHandle);
+
+    LOG_TRACE(Kernel_SVC, "called handle=0x{:08X}({})", handle, session->GetName());
+
+    return session->SendSyncRequest();
+}
+
+Result SendSyncRequest32(Core::System& system, Handle handle) {
+    return SendSyncRequest(system, handle);
+}
+
+Result ReplyAndReceive(Core::System& system, s32* out_index, Handle* handles, s32 num_handles,
+                       Handle reply_target, s64 timeout_ns) {
+    auto& kernel = system.Kernel();
+    auto& handle_table = GetCurrentThread(kernel).GetOwnerProcess()->GetHandleTable();
+
+    // Convert handle list to object table.
+    std::vector<KSynchronizationObject*> objs(num_handles);
+    R_UNLESS(
+        handle_table.GetMultipleObjects<KSynchronizationObject>(objs.data(), handles, num_handles),
+        ResultInvalidHandle);
+
+    // Ensure handles are closed when we're done.
+    SCOPE_EXIT({
+        for (auto i = 0; i < num_handles; ++i) {
+            objs[i]->Close();
+        }
+    });
+
+    // Reply to the target, if one is specified.
+    if (reply_target != InvalidHandle) {
+        KScopedAutoObject session = handle_table.GetObject<KServerSession>(reply_target);
+        R_UNLESS(session.IsNotNull(), ResultInvalidHandle);
+
+        // If we fail to reply, we want to set the output index to -1.
+        ON_RESULT_FAILURE {
+            *out_index = -1;
+        };
+
+        // Send the reply.
+        R_TRY(session->SendReply());
+    }
+
+    // Wait for a message.
+    while (true) {
+        // Wait for an object.
+        s32 index;
+        Result result = KSynchronizationObject::Wait(kernel, &index, objs.data(),
+                                                     static_cast<s32>(objs.size()), timeout_ns);
+        if (result == ResultTimedOut) {
+            return result;
+        }
+
+        // Receive the request.
+        if (R_SUCCEEDED(result)) {
+            KServerSession* session = objs[index]->DynamicCast<KServerSession*>();
+            if (session != nullptr) {
+                result = session->ReceiveRequest();
+                if (result == ResultNotFound) {
+                    continue;
+                }
+            }
+        }
+
+        *out_index = index;
+        return result;
+    }
+}
+
+} // namespace Kernel::Svc