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Annotation of nono/vm/gvram.cpp, revision 1.1.1.4

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

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