140 lines
3.4 KiB
C#
140 lines
3.4 KiB
C#
using System;
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namespace BizHawk.Emulation.Cores.Components.Z80A
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{
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public partial class Z80A
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{
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private bool iff1;
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public bool IFF1 { get { return iff1; } set { iff1 = value; } }
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private bool iff2;
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public bool IFF2 { get { return iff2; } set { iff2 = value; } }
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private bool nonMaskableInterrupt;
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public bool NonMaskableInterrupt
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{
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get { return nonMaskableInterrupt; }
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set { if (value && !nonMaskableInterrupt) NonMaskableInterruptPending = true; nonMaskableInterrupt = value; }
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}
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private bool nonMaskableInterruptPending;
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public bool NonMaskableInterruptPending { get { return nonMaskableInterruptPending; } set { nonMaskableInterruptPending = value; } }
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private int interruptMode;
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public int InterruptMode
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{
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get { return interruptMode; }
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set { if (value < 0 || value > 2) throw new ArgumentOutOfRangeException(); interruptMode = value; }
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}
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public Action IRQCallback = delegate () { };
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public Action NMICallback = delegate () { };
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// this will be a few cycles off for now
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// it should suffice for now until Alyosha returns from hiatus
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public Action IRQACKCallback = delegate () { };
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private void NMI_()
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{
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PopulateCURINSTR
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(IDLE,
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IDLE,
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IDLE,
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IDLE,
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DEC16, SPl, SPh,
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TR, ALU, PCl,
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WAIT,
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WR_DEC, SPl, SPh, PCh,
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TR16, PCl, PCh, NMI_V, ZERO,
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WAIT,
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WR, SPl, SPh, ALU);
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PopulateBUSRQ(0, 0, 0, 0, 0, SPh, 0, 0, SPh, 0, 0);
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PopulateMEMRQ(0, 0, 0, 0, 0, SPh, 0, 0, SPh, 0, 0);
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IRQS = 11;
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}
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// Mode 0 interrupts only take effect if a CALL or RST is on the data bus
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// Otherwise operation just continues as normal
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// For now assume a NOP is on the data bus, in which case no stack operations occur
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//NOTE: TODO: When a CALL is present on the data bus, adjust WZ accordingly
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private void INTERRUPT_0(ushort src)
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{
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PopulateCURINSTR
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(IDLE,
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IDLE,
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IORQ,
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WAIT,
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IDLE,
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WAIT,
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RD_INC, ALU, PCl, PCh);
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PopulateBUSRQ(0, 0, 0, 0, PCh, 0, 0);
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PopulateMEMRQ(0, 0, 0, 0, PCh, 0, 0);
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IRQS = 7;
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}
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// Just jump to $0038
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private void INTERRUPT_1()
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{
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PopulateCURINSTR
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(IDLE,
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IDLE,
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IORQ,
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WAIT,
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IDLE,
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TR, ALU, PCl,
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DEC16, SPl, SPh,
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IDLE,
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WAIT,
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WR_DEC, SPl, SPh, PCh,
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TR16, PCl, PCh, IRQ_V, ZERO,
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WAIT,
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WR, SPl, SPh, ALU);
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PopulateBUSRQ(0, 0, 0, 0, I, 0, 0, SPh, 0, 0, SPh, 0, 0);
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PopulateMEMRQ(0, 0, 0, 0, I, 0, 0, SPh, 0, 0, SPh, 0, 0);
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IRQS = 13;
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}
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// Interrupt mode 2 uses the I vector combined with a byte on the data bus
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private void INTERRUPT_2()
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{
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PopulateCURINSTR
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(IDLE,
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IDLE,
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IORQ,
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WAIT,
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FTCH_DB,
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IDLE,
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DEC16, SPl, SPh,
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TR16, Z, W, DB, I,
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WAIT,
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WR_DEC, SPl, SPh, PCh,
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IDLE,
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WAIT,
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WR, SPl, SPh, PCl,
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IDLE,
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WAIT,
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RD_INC, PCl, Z, W,
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IDLE,
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WAIT,
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RD, PCh, Z, W);
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PopulateBUSRQ(0, 0, 0, 0, I, 0, 0, SPh, 0, 0, SPh, 0, 0, W, 0, 0, W, 0, 0);
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PopulateMEMRQ(0, 0, 0, 0, I, 0, 0, SPh, 0, 0, SPh, 0, 0, W, 0, 0, W, 0, 0);
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IRQS = 19;
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}
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private void ResetInterrupts()
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{
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IFF1 = false;
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IFF2 = false;
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NonMaskableInterrupt = false;
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NonMaskableInterruptPending = false;
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FlagI = false;
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InterruptMode = 1;
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}
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}
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} |