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

1.1       root        1: //
                      2: // nono
                      3: // Copyright (C) 2018 [email protected]
                      4: //
                      5: 
                      6: #include "sysclk.h"
                      7: #include "mpu.h"
                      8: 
                      9: SysClkDevice::SysClkDevice()
                     10: {
                     11:        logname = "sysclk";
                     12:        devname = "SystemClock";
                     13:        devaddr = 0x63000000;
                     14: 
                     15:        event.dev = this;
                     16:        event.func = (DeviceCallback_t)&SysClkDevice::Callback;
                     17:        event.code = 0;
                     18:        event.time = 16.666667_msec;
1.1.1.2   root       19:        event.SetName("System Clock");
1.1       root       20: }
                     21: 
                     22: SysClkDevice::~SysClkDevice()
                     23: {
                     24: }
                     25: 
                     26: bool
                     27: SysClkDevice::PowerOn()
                     28: {
                     29:        // 電源オンですぐ起動
1.1.1.3 ! root       30:        event.Start();
1.1       root       31:        return true;
                     32: }
                     33: 
                     34: uint64
1.1.1.3 ! root       35: SysClkDevice::Read(uint32 addr)
1.1       root       36: {
1.1.1.3 ! root       37:        // 1 ポートしかない
        !            38:        return GetInt();
        !            39: }
1.1       root       40: 
1.1.1.3 ! root       41: uint64
        !            42: SysClkDevice::Write(uint32 addr, uint32 data)
        !            43: {
        !            44:        // 何か書き込まれたら、フラグをクリア
        !            45:        sysint = false;
        !            46:        putlog(1, "システムクロック割り込みクリア");
        !            47:        return 0;
1.1       root       48: }
                     49: 
                     50: uint64
1.1.1.3 ! root       51: SysClkDevice::Peek(uint32 addr)
1.1       root       52: {
1.1.1.3 ! root       53:        return GetInt();
        !            54: }
        !            55: 
        !            56: // 割り込み状態を取得(?)
        !            57: uint8
        !            58: SysClkDevice::GetInt() const
        !            59: {
        !            60:        uint8 data = 0;
1.1       root       61: 
1.1.1.3 ! root       62:        if (sysint) {
        !            63:                data |= 0x80;
1.1       root       64:        }
1.1.1.3 ! root       65:        return data;
1.1       root       66: }
                     67: 
                     68: // イベントハンドラ
                     69: void
                     70: SysClkDevice::Callback(int arg)
                     71: {
                     72:        putlog(3, "システムクロック割り込み発生");
                     73:        sysint = true;
                     74:        gMPU->Interrupt(5);
1.1.1.3 ! root       75:        event.Start();
1.1       root       76: }

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