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Annotation of nono/vm/bankram.h, revision 1.1.1.1

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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