mirror of https://github.com/bsnes-emu/bsnes.git
63 lines
1.1 KiB
C++
63 lines
1.1 KiB
C++
#include <processor/processor.hpp>
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#include "z80.hpp"
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namespace Processor {
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#include "disassembler.cpp"
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#include "registers.cpp"
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#include "memory.cpp"
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#include "instruction.cpp"
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#include "algorithms.cpp"
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#include "instructions.cpp"
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#include "serialization.cpp"
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auto Z80::power() -> void {
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memory::fill(&r, sizeof(Registers));
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r.hlp = &r.hl;
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bus->request(false);
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bus->grant(true);
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}
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auto Z80::irq(bool maskable, uint16 pc, uint8 extbus) -> bool {
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if(maskable && !r.iff1) return false;
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push(r.pc);
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switch(maskable ? r.im : (uint2)1) {
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case 0: {
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//external data bus ($ff = RST $38)
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r.pc = extbus;
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break;
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}
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case 1: {
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//constant address
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r.pc = pc;
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break;
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}
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case 2: {
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//vector table with external data bus
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uint16 addr = (r.ir.byte.hi << 8) | extbus;
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r.pc = read(addr + 0) << 0;
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r.pc |= read(addr + 1) << 8;
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break;
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}
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}
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r.iff1 = 0;
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if(maskable) r.iff2 = 0;
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return true;
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}
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auto Z80::parity(uint8 value) const -> bool {
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value ^= value >> 4;
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value ^= value >> 2;
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value ^= value >> 1;
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return !(value & 1);
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}
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}
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