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Annotation of nono/vm/gvram.cpp, revision 1.1.1.8

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: 
1.1.1.8 ! root       18: // InsideOut p.135
        !            19: static const busdata wait = busdata::Wait(9 * 40_nsec);
        !            20: 
1.1.1.6   root       21: // コンストラクタ
1.1       root       22: GVRAMDevice::GVRAMDevice()
1.1.1.7   root       23:        : inherited(OBJ_GVRAM)
1.1       root       24: {
1.1.1.7   root       25:        uint devlen = 0x20'0000;        // XXX とりあえず
1.1       root       26: 
1.1.1.2   root       27:        mem.reset(new uint8[devlen]);
1.1       root       28: }
                     29: 
1.1.1.6   root       30: // デストラクタ
1.1       root       31: GVRAMDevice::~GVRAMDevice()
                     32: {
                     33: }
                     34: 
1.1.1.8 ! root       35: busdata
1.1       root       36: GVRAMDevice::Read8(uint32 addr)
                     37: {
1.1.1.8 ! root       38:        busdata data;
1.1.1.7   root       39:        uint32 offset = addr - baseaddr;
1.1.1.8 ! root       40:        data = mem[HB(offset)];
        !            41:        data |= wait;
        !            42:        return data;
1.1       root       43: }
                     44: 
1.1.1.8 ! root       45: busdata
1.1       root       46: GVRAMDevice::Read16(uint32 addr)
                     47: {
1.1.1.8 ! root       48:        busdata data;
1.1.1.7   root       49:        uint32 offset = addr - baseaddr;
1.1.1.8 ! root       50:        data = *(uint16 *)&mem[offset];
        !            51:        data |= wait;
        !            52:        return data;
1.1       root       53: }
                     54: 
1.1.1.8 ! root       55: busdata
1.1       root       56: GVRAMDevice::Write8(uint32 addr, uint32 data)
                     57: {
1.1.1.7   root       58:        uint32 offset = addr - baseaddr;
1.1       root       59:        mem[HB(offset)] = data;
1.1.1.8 ! root       60:        return wait;
1.1       root       61: }
                     62: 
1.1.1.8 ! root       63: busdata
1.1       root       64: GVRAMDevice::Write16(uint32 addr, uint32 data)
                     65: {
1.1.1.7   root       66:        uint32 offset = addr - baseaddr;
1.1       root       67:        *(uint16 *)&mem[offset] = data;
1.1.1.8 ! root       68:        return wait;
1.1       root       69: }
                     70: 
1.1.1.8 ! root       71: busdata
1.1       root       72: GVRAMDevice::Peek8(uint32 addr)
                     73: {
1.1.1.7   root       74:        return mem[HB(addr - baseaddr)];
1.1       root       75: }

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