64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
#pragma once
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#include "bus.hh"
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#include "psr.hh"
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#include <cstdint>
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using std::size_t;
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class Cpu {
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public:
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Cpu(Bus bus);
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private:
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static constexpr size_t GPR_FIQ_BANKED_FIRST = 8;
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static constexpr size_t GPR_FIQ_BANKED_COUNT = 7;
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static constexpr size_t GPR_SVC_BANKED_FIRST = 13;
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static constexpr size_t GPR_SVC_BANKED_COUNT = 2;
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static constexpr size_t GPR_ABT_BANKED_FIRST = 13;
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static constexpr size_t GPR_ABT_BANKED_COUNT = 2;
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static constexpr size_t GPR_IRQ_BANKED_FIRST = 13;
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static constexpr size_t GPR_IRQ_BANKED_COUNT = 2;
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static constexpr size_t GPR_UND_BANKED_FIRST = 13;
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static constexpr size_t GPR_UND_BANKED_COUNT = 2;
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static constexpr size_t GPR_SYS_USR_BANKED_FIRST = 8;
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static constexpr size_t GPR_SYS_USR_BANKED_COUNT = 7;
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static constexpr size_t GPR_VISIBLE_COUNT = 16;
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uint32_t gpr[GPR_VISIBLE_COUNT]; // general purpose registers
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Psr cpsr; // current program status register
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Psr spsr; // status program status register
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Bus bus;
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struct {
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uint32_t fiq[GPR_FIQ_BANKED_COUNT];
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uint32_t svc[GPR_SVC_BANKED_COUNT];
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uint32_t abt[GPR_ABT_BANKED_COUNT];
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uint32_t irq[GPR_IRQ_BANKED_COUNT];
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uint32_t und[GPR_UND_BANKED_COUNT];
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// visible registers before the mode switch
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uint32_t old[GPR_SYS_USR_BANKED_COUNT];
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} gpr_banked; // banked general purpose registers
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struct {
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Psr fiq;
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Psr svc;
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Psr abt;
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Psr irq;
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Psr und;
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} spsr_banked; // banked saved program status registers
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void chg_mode(Mode from, Mode to);
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uint32_t& operator[](uint8_t idx);
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const uint32_t& operator[](uint8_t idx) const;
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};
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