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Annotation of nono/vm/gvram.cpp, revision 1.1.1.7

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: //
                      8: // GVRAM
                      9: //
1.1.1.6   root       10: 
1.1       root       11: // GVRAM はワード単位でホストバイトオーダ配置なので、
                     12: // バイトアクセス時は HB() マクロを使用のこと。
                     13: 
1.1.1.6   root       14: #include "gvram.h"
                     15: #include "mpu.h"
                     16: #include "videoctlr.h"
                     17: 
                     18: // コンストラクタ
1.1       root       19: GVRAMDevice::GVRAMDevice()
1.1.1.7 ! root       20:        : inherited(OBJ_GVRAM)
1.1       root       21: {
1.1.1.7 ! root       22:        uint devlen = 0x20'0000;        // XXX とりあえず
1.1       root       23: 
1.1.1.2   root       24:        mem.reset(new uint8[devlen]);
1.1       root       25: }
                     26: 
1.1.1.6   root       27: // デストラクタ
1.1       root       28: GVRAMDevice::~GVRAMDevice()
                     29: {
                     30: }
                     31: 
                     32: uint64
                     33: GVRAMDevice::Read8(uint32 addr)
                     34: {
1.1.1.7 ! root       35:        mpu->AddCycle(9);       // Inside/Out p.135
        !            36:        uint32 offset = addr - baseaddr;
1.1       root       37:        return mem[HB(offset)];
                     38: }
                     39: 
                     40: uint64
                     41: GVRAMDevice::Read16(uint32 addr)
                     42: {
1.1.1.7 ! root       43:        mpu->AddCycle(9);       // Inside/Out p.135
        !            44:        uint32 offset = addr - baseaddr;
1.1       root       45:        return *(uint16 *)&mem[offset];
                     46: }
                     47: 
                     48: uint64
                     49: GVRAMDevice::Write8(uint32 addr, uint32 data)
                     50: {
1.1.1.7 ! root       51:        mpu->AddCycle(9);       // Inside/Out p.135
        !            52:        uint32 offset = addr - baseaddr;
1.1       root       53:        mem[HB(offset)] = data;
                     54:        return 0;
                     55: }
                     56: 
                     57: uint64
                     58: GVRAMDevice::Write16(uint32 addr, uint32 data)
                     59: {
1.1.1.7 ! root       60:        mpu->AddCycle(9);       // Inside/Out p.135
        !            61:        uint32 offset = addr - baseaddr;
1.1       root       62:        *(uint16 *)&mem[offset] = data;
                     63:        return 0;
                     64: }
                     65: 
                     66: uint64
                     67: GVRAMDevice::Peek8(uint32 addr)
                     68: {
1.1.1.7 ! root       69:        return mem[HB(addr - baseaddr)];
1.1       root       70: }

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