83 lines
2.2 KiB
C#
83 lines
2.2 KiB
C#
//
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// Copyright (c) 2010-2018 Antmicro
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// Copyright (c) 2011-2015 Realtime Embedded
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//
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// This file is licensed under the MIT License.
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// Full license text is available in 'licenses/MIT.txt'.
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//
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using System;
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using Antmicro.Renode.Core;
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using Antmicro.Renode.Peripherals.Bus;
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using Antmicro.Renode.Time;
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using Antmicro.Renode.Logging;
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using System.Threading;
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namespace Antmicro.Renode.Peripherals.Timers
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{
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public class BSOCTickTimer : IDoubleWordPeripheral, IKnownSize
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{
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public BSOCTickTimer(ulong periodInMs, Machine machine)
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{
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running = true;
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machine.ClockSource.AddClockEntry(new ClockEntry(periodInMs, ClockEntry.FrequencyToRatio(this, 1000), OnTick, this, String.Empty));
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}
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public long Size
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{
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get
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{
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return 0x400;
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}
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}
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public virtual uint ReadDoubleWord(long offset)
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{
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if (offset == 0)
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return 0;
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else if (offset == 4)
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offset = 40;
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else if (offset == 8)
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offset = 32;
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else if (offset == 12)
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offset = 24;
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else if (offset == 16)
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offset = 16;
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else if (offset == 20)
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offset = 8;
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else if (offset == 24)
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offset = 0;
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else {
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this.LogUnhandledRead(offset);
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return 0;
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}
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return (uint)(Interlocked.CompareExchange(ref counter, 0, 0) >> (int)offset);
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}
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public virtual void WriteDoubleWord(long offset, uint value)
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{
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if (offset == 0) {
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if ((value & 1) == 1)
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Interlocked.Exchange(ref counter, 0);
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running = ((value & 2) != 2);
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return;
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}
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this.LogUnhandledWrite(offset, value);
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}
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public virtual void Reset()
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{
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Interlocked.Exchange(ref counter, 0);
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}
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private void OnTick()
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{
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if (running)
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Interlocked.Increment(ref counter);
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}
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private long counter;
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private bool running;
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}
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}
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