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Annotation of nono/vm/gvram.cpp, revision 1.1.1.6

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: // グローバル参照用
        !            19: GVRAMDevice *gGVRAM;
1.1       root       20: 
1.1.1.6 ! root       21: // コンストラクタ
1.1       root       22: GVRAMDevice::GVRAMDevice()
1.1.1.5   root       23:        : inherited("GVRAM")
1.1       root       24: {
                     25:        devaddr = 0xc00000;
                     26:        devlen  = 0x200000;     // XXX とりあえず
                     27: 
1.1.1.2   root       28:        mem.reset(new uint8[devlen]);
1.1       root       29: }
                     30: 
1.1.1.6 ! root       31: // デストラクタ
1.1       root       32: GVRAMDevice::~GVRAMDevice()
                     33: {
1.1.1.6 ! root       34:        gGVRAM = NULL;
1.1       root       35: }
                     36: 
                     37: uint64
                     38: GVRAMDevice::Read8(uint32 addr)
                     39: {
1.1.1.4   root       40:        gMPU->AddCycle(9);      // Inside/Out p.135
1.1       root       41:        uint32 offset = addr - devaddr;
                     42:        return mem[HB(offset)];
                     43: }
                     44: 
                     45: uint64
                     46: GVRAMDevice::Read16(uint32 addr)
                     47: {
1.1.1.4   root       48:        gMPU->AddCycle(9);      // Inside/Out p.135
1.1       root       49:        uint32 offset = addr - devaddr;
                     50:        return *(uint16 *)&mem[offset];
                     51: }
                     52: 
                     53: uint64
                     54: GVRAMDevice::Write8(uint32 addr, uint32 data)
                     55: {
1.1.1.4   root       56:        gMPU->AddCycle(9);      // Inside/Out p.135
1.1       root       57:        uint32 offset = addr - devaddr;
                     58:        mem[HB(offset)] = data;
                     59:        return 0;
                     60: }
                     61: 
                     62: uint64
                     63: GVRAMDevice::Write16(uint32 addr, uint32 data)
                     64: {
1.1.1.4   root       65:        gMPU->AddCycle(9);      // Inside/Out p.135
1.1       root       66:        uint32 offset = addr - devaddr;
                     67:        *(uint16 *)&mem[offset] = data;
                     68:        return 0;
                     69: }
                     70: 
                     71: uint64
                     72: GVRAMDevice::Peek8(uint32 addr)
                     73: {
                     74:        return mem[HB(addr - devaddr)];
                     75: }

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