Rework ADSP into a wrapper for apps

src/audio_core/adsp/mailbox.h

@@ -0,0 +1,69 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "common/bounded_threadsafe_queue.h"
+#include "common/common_types.h"
+
+namespace AudioCore::ADSP {
+
+enum class AppMailboxId : u32 {
+    Invalid = 0,
+    AudioRenderer = 50,
+    AudioRendererMemoryMapUnmap = 51,
+};
+
+enum class Direction : u32 {
+    Host,
+    DSP,
+};
+
+struct MailboxMessage {
+    u32 msg;
+    std::span<u8> data;
+};
+
+class Mailbox {
+public:
+    void Initialize(AppMailboxId id_) {
+        Reset();
+        id = id_;
+    }
+
+    AppMailboxId Id() const noexcept {
+        return id;
+    }
+
+    void Send(Direction dir, MailboxMessage&& message) {
+        auto& queue = dir == Direction::Host ? host_queue : adsp_queue;
+        queue.EmplaceWait(std::move(message));
+    }
+
+    MailboxMessage Receive(Direction dir, bool block = true) {
+        auto& queue = dir == Direction::Host ? host_queue : adsp_queue;
+        MailboxMessage t;
+        if (block) {
+            queue.PopWait(t);
+        } else {
+            queue.TryPop(t);
+        }
+        return t;
+    }
+
+    void Reset() {
+        id = AppMailboxId::Invalid;
+        MailboxMessage t;
+        while (host_queue.TryPop(t)) {
+        }
+        while (adsp_queue.TryPop(t)) {
+        }
+    }
+
+private:
+    AppMailboxId id{0};
+    Common::SPSCQueue<MailboxMessage> host_queue;
+    Common::SPSCQueue<MailboxMessage> adsp_queue;
+};
+
+} // namespace AudioCore::ADSP