--- nono/vm/zram.h	2026/04/29 17:04:28	1.1.1.1
+++ nono/vm/zram.h	2026/04/29 17:05:11	1.1.1.6
@@ -1,35 +1,37 @@
 //
 // nono
-// Copyright (C) 2018 isaki@NetBSD.org
+// Copyright (C) 2020 nono project
+// Licensed under nono-license.txt
+//
+
+//
+// 3ポート共有 RAM
 //
 
 #pragma once
 
 #include "device.h"
-#include <mutex>
 
-class ZRAMDevice
-	: public IODevice
+class ZRAMDevice : public IODevice
 {
-	typedef IODevice inherited;
+	using inherited = IODevice;
  public:
 	ZRAMDevice();
-	virtual ~ZRAMDevice();
+	virtual ~ZRAMDevice() override;
 
-	virtual uint64 Read8(uint32 addr);
-	virtual uint64 Read16(uint32 addr);
-	virtual uint64 Read32(uint32 addr);
-	virtual uint64 Write8(uint32 addr, uint32 data);
-	virtual uint64 Write16(uint32 addr, uint32 data);
-	virtual uint64 Write32(uint32 addr, uint32 data);
-	virtual uint64 Peek8(uint32 addr);
+	uint64 Read8(uint32 addr) override;
+	uint64 Read16(uint32 addr) override;
+	uint64 Read32(uint32 addr) override;
+	uint64 Write8(uint32 addr, uint32 data) override;
+	uint64 Write16(uint32 addr, uint32 data) override;
+	uint64 Write32(uint32 addr, uint32 data) override;
+	uint64 Peek8(uint32 addr) override;
 
  private:
-	uint8 *ram = NULL;
+	// アドレスデコーダ
+	uint64 Decoder(uint32 addr) const;
 
-	// アクセス競合を防ぐロック。
-	// Lance は裏スレッドからアクセスにくるので。
-	std::mutex mtx {};
+	std::unique_ptr<uint8[]> ram {};
 };
 
 extern ZRAMDevice *gZRAM;