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Annotation of nono/vm/gvram.cpp, revision 1.1.1.5

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"
1.1.1.4   root        8: #include "mpu.h"
1.1.1.3   root        9: #include "videoctlr.h"
1.1       root       10: 
                     11: //
                     12: // GVRAM
                     13: //
                     14: // GVRAM はワード単位でホストバイトオーダ配置なので、
                     15: // バイトアクセス時は HB() マクロを使用のこと。
                     16: //
                     17: 
1.1.1.2   root       18: std::unique_ptr<GVRAMDevice> gGVRAM;
1.1       root       19: 
                     20: GVRAMDevice::GVRAMDevice()
1.1.1.5 ! root       21:        : inherited("GVRAM")
1.1       root       22: {
                     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: {
1.1.1.4   root       36:        gMPU->AddCycle(9);      // Inside/Out p.135
1.1       root       37:        uint32 offset = addr - devaddr;
                     38:        return mem[HB(offset)];
                     39: }
                     40: 
                     41: uint64
                     42: GVRAMDevice::Read16(uint32 addr)
                     43: {
1.1.1.4   root       44:        gMPU->AddCycle(9);      // Inside/Out p.135
1.1       root       45:        uint32 offset = addr - devaddr;
                     46:        return *(uint16 *)&mem[offset];
                     47: }
                     48: 
                     49: uint64
                     50: GVRAMDevice::Write8(uint32 addr, uint32 data)
                     51: {
1.1.1.4   root       52:        gMPU->AddCycle(9);      // Inside/Out p.135
1.1       root       53:        uint32 offset = addr - devaddr;
                     54:        mem[HB(offset)] = data;
                     55:        return 0;
                     56: }
                     57: 
                     58: uint64
                     59: GVRAMDevice::Write16(uint32 addr, uint32 data)
                     60: {
1.1.1.4   root       61:        gMPU->AddCycle(9);      // Inside/Out p.135
1.1       root       62:        uint32 offset = addr - devaddr;
                     63:        *(uint16 *)&mem[offset] = data;
                     64:        return 0;
                     65: }
                     66: 
                     67: uint64
                     68: GVRAMDevice::Peek8(uint32 addr)
                     69: {
                     70:        return mem[HB(addr - devaddr)];
                     71: }

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