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Annotation of nono/vm/sram.h, revision 1.1.1.4

1.1       root        1: //
                      2: // nono
1.1.1.3   root        3: // Copyright (C) 2020 nono project
                      4: // Licensed under nono-license.txt
1.1       root        5: //
                      6: 
                      7: #pragma once
                      8: 
                      9: #include "device.h"
1.1.1.3   root       10: #include "mappedfile.h"
1.1       root       11: 
                     12: class SRAMDevice
                     13:        : public IODevice
                     14: {
1.1.1.3   root       15:        using inherited = IODevice;
1.1       root       16:  private:
                     17:        static const uint32 baseaddr = 0xed0000;
                     18: 
1.1.1.3   root       19:        // Pluto-X によるホストファイル起動アドレス
                     20:        static const uint32 plutoaddr = 0xeac000;
                     21: 
1.1       root       22:  public:
                     23:        SRAMDevice();
1.1.1.3   root       24:        ~SRAMDevice() override;
1.1       root       25: 
1.1.1.3   root       26:        bool Init() override;
1.1       root       27: 
1.1.1.3   root       28:        uint64 Read8(uint32 addr) override;
                     29:        uint64 Read16(uint32 addr) override;
                     30:        uint64 Write8(uint32 addr, uint32 data) override;
                     31:        uint64 Write16(uint32 addr, uint32 data) override;
                     32:        uint64 Peek8(uint32 addr) override;
1.1       root       33: 
                     34:        void write_enable(bool value);
                     35: 
                     36:  private:
1.1.1.2   root       37:        // アドレスデコーダ
                     38:        uint64 Decoder(uint32 addr) const;
                     39: 
1.1.1.3   root       40:        // ファイル
                     41:        std::string filename {};
                     42:        MappedFile file {};
                     43:        uint8 *mem {};
1.1       root       44: 
1.1.1.4 ! root       45:        bool writeable {};
1.1.1.3   root       46: 
                     47:        // ホストファイル起動用の読み出し値を返す
                     48:        uint32 PeekHostBoot(uint32 offset) const;
1.1       root       49: };
                     50: 
1.1.1.2   root       51: extern std::unique_ptr<SRAMDevice> gSRAM;

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