78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
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#ifndef BEAR_CPU_H
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#define BEAR_CPU_H
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#include "common.h"
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#include "memory.h"
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class CPU
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{
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public:
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explicit CPU(IMemoryAccessor* memory);
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void start();
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void reset();
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private:
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enum STATUS_FLAGS
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{
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C = 1 << 0,
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Z = 1 << 1,
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I = 1 << 2,
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D = 1 << 3,
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B = 1 << 4,
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O = 1 << 6,
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N = 1 << 7,
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};
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uint8_t a;
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uint8_t x, y;
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uint16_t pc;
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uint8_t sp;
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IMemoryAccessor* _memory;
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// Stat flags
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uint8_t stat;
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int cycles;
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bool stop;
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void c(const bool _v) { _v ? (stat |= C) : stat &= ~C; }
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[[nodiscard]] bool c() const { return (stat & C) > 0; }
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void z(const bool _v) { _v ? (stat |= Z) : stat &= ~Z; }
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[[nodiscard]] bool z() const { return (stat & Z) > 0; }
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void i(const bool _v) { _v ? (stat |= I) : stat &= ~I; }
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[[nodiscard]] bool i() const { return (stat & I) > 0; }
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void d(const bool _v) { _v ? (stat |= D) : stat &= ~D; }
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[[nodiscard]] bool d() const { return (stat & D) > 0; }
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void b(const bool _v) { _v ? (stat |= B) : stat &= ~B; }
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[[nodiscard]] bool b() const { return (stat & B) > 0; }
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void o(const bool _v) { _v ? (stat |= O) : stat &= ~O; }
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[[nodiscard]] bool o() const { return (stat & O) > 0; }
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// END Stat flags
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void loop();
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[[nodiscard]] std::uint8_t readImm() const;
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[[nodiscard]] std::uint8_t readZp() const;
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[[nodiscard]] std::uint8_t readZpX() const;
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[[nodiscard]] std::uint8_t readAbs();
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[[nodiscard]] std::uint8_t readAbsX();
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[[nodiscard]] std::uint8_t readAbsY();
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[[nodiscard]] std::uint8_t readIdxInd();
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[[nodiscard]] std::uint8_t readIndIdx();
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void adc(std::uint8_t val);
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void setFlagsFromResult(std::uint16_t result);
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};
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#endif //BEAR_CPU_H
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