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Annotation of nono/vm/gvram.cpp, revision 1.1.1.3

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: #include "gvram.h"
1.1.1.3 ! root        8: #include "videoctlr.h"
1.1       root        9: 
                     10: //
                     11: // GVRAM
                     12: //
                     13: // GVRAM はワード単位でホストバイトオーダ配置なので、
                     14: // バイトアクセス時は HB() マクロを使用のこと。
                     15: //
                     16: 
1.1.1.2   root       17: std::unique_ptr<GVRAMDevice> gGVRAM;
1.1       root       18: 
                     19: GVRAMDevice::GVRAMDevice()
                     20: {
                     21:        logname = "gvram";
                     22:        devname = "GVRAM";
                     23:        devaddr = 0xc00000;
                     24:        devlen  = 0x200000;     // XXX とりあえず
                     25: 
1.1.1.2   root       26:        mem.reset(new uint8[devlen]);
1.1       root       27: }
                     28: 
                     29: GVRAMDevice::~GVRAMDevice()
                     30: {
                     31: }
                     32: 
                     33: uint64
                     34: GVRAMDevice::Read8(uint32 addr)
                     35: {
                     36:        uint32 offset = addr - devaddr;
                     37:        return mem[HB(offset)];
                     38: }
                     39: 
                     40: uint64
                     41: GVRAMDevice::Read16(uint32 addr)
                     42: {
                     43:        uint32 offset = addr - devaddr;
                     44:        return *(uint16 *)&mem[offset];
                     45: }
                     46: 
                     47: uint64
                     48: GVRAMDevice::Write8(uint32 addr, uint32 data)
                     49: {
                     50:        uint32 offset = addr - devaddr;
                     51:        mem[HB(offset)] = data;
                     52:        return 0;
                     53: }
                     54: 
                     55: uint64
                     56: GVRAMDevice::Write16(uint32 addr, uint32 data)
                     57: {
                     58:        uint32 offset = addr - devaddr;
                     59:        *(uint16 *)&mem[offset] = data;
                     60:        return 0;
                     61: }
                     62: 
                     63: uint64
                     64: GVRAMDevice::Peek8(uint32 addr)
                     65: {
                     66:        return mem[HB(addr - devaddr)];
                     67: }

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