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Annotation of nono/vm/bankram.h, revision 1.1

1.1     ! root        1: //
        !             2: // nono
        !             3: // Copyright (C) 2023 nono project
        !             4: // Licensed under nono-license.txt
        !             5: //
        !             6: 
        !             7: //
        !             8: // Nereid バンクメモリ
        !             9: //
        !            10: 
        !            11: #pragma once
        !            12: 
        !            13: #include "device.h"
        !            14: 
        !            15: class BankRAMDevice : public IODevice
        !            16: {
        !            17:        using inherited = IODevice;
        !            18:  public:
        !            19:        BankRAMDevice(int objid_, int ram_size_MB);
        !            20:        virtual ~BankRAMDevice() override;
        !            21: 
        !            22:        bool Init() override;
        !            23:        void ResetHard(bool poweron) override;
        !            24: 
        !            25:        uint64 Read8(uint32 addr) override;
        !            26:        uint64 Read16(uint32 addr) override;
        !            27:        uint64 Read32(uint32 addr) override;
        !            28:        uint64 Write8(uint32 addr, uint32 data) override;
        !            29:        uint64 Write16(uint32 addr, uint32 data) override;
        !            30:        uint64 Write32(uint32 addr, uint32 data) override;
        !            31:        uint64 Peek8(uint32 addr) override;
        !            32:        uint64 Poke8(uint32 addr, uint32 data) override;
        !            33: 
        !            34:        // バンクページ取得・設定
        !            35:        uint32 GetPage() const { return page; }
        !            36:        void SetPage(uint32 page);
        !            37: 
        !            38:        // バンクメモリ容量 [MB]を取得 (負数は扱わない)
        !            39:        uint GetSize() const { return ram_size / 1024 / 1024; }
        !            40: 
        !            41:  private:
        !            42:        // アドレスデコーダ
        !            43:        inline uint32 Decoder(uint32 addr) const;
        !            44: 
        !            45:        std::unique_ptr<uint8[]> ram {};
        !            46:        uint ram_size {};
        !            47: 
        !            48:        // ページ番号 (レジスタ値、マスク前)
        !            49:        uint32 page {};
        !            50: 
        !            51:        // ページ番号をリニアアドレスにした状態で保持。
        !            52:        uint32 pageaddr {};
        !            53: };

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