71 lines
2.6 KiB
C++
71 lines
2.6 KiB
C++
#pragma once
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#include <cstdint>
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typedef struct {
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uint16_t par;
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uint16_t pdr;
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} page_t;
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class mmu
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{
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private:
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// 8 pages, D/I, 3 modes and 1 invalid mode
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page_t pages[4][2][8];
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uint16_t MMR0 { 0 };
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uint16_t MMR1 { 0 };
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uint16_t MMR2 { 0 };
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uint16_t MMR3 { 0 };
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uint16_t CPUERR { 0 };
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uint16_t PIR { 0 };
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uint16_t CSR { 0 };
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public:
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mmu();
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virtual ~mmu();
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void reset();
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bool is_enabled() const { return MMR0 & 1; }
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bool is_locked() const { return !!(MMR0 & 0160000); }
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void set_page_trapped (const int run_mode, const bool d, const int apf) { pages[run_mode][d][apf].pdr |= 1 << 7; }
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void set_page_written_to(const int run_mode, const bool d, const int apf) { pages[run_mode][d][apf].pdr |= 1 << 6; }
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int get_access_control (const int run_mode, const bool d, const int apf) { return pages[run_mode][d][apf].pdr & 7; }
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int get_pdr_len (const int run_mode, const bool d, const int apf) { return (pages[run_mode][d][apf].pdr >> 8) & 127; }
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int get_pdr_direction (const int run_mode, const bool d, const int apf) { return pages[run_mode][d][apf].pdr & 8; }
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uint32_t get_physical_memory_offset(const int run_mode, const bool d, const int apf) const { return pages[run_mode][d][apf].par * 64; }
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bool get_use_data_space(const int run_mode) const;
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uint16_t getMMR0() const { return MMR0; }
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uint16_t getMMR1() const { return MMR1; }
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uint16_t getMMR2() const { return MMR2; }
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uint16_t getMMR3() const { return MMR3; }
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uint16_t getMMR(int nr) const { const uint16_t *const mmrs[] { &MMR0, &MMR1, &MMR2, &MMR3 }; return *mmrs[nr]; }
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void setMMR0(const uint16_t value);
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void setMMR1(const uint16_t value);
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void setMMR2(const uint16_t value);
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void setMMR3(const uint16_t value);
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bool isMMR1Locked() const { return !!(MMR0 & 0160000); }
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void clearMMR1();
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void addToMMR1(const int8_t delta, const uint8_t reg);
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void setMMR0Bit(const int bit);
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void clearMMR0Bit(const int bit);
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uint16_t getCPUERR() const { return CPUERR; }
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void setCPUERR(const uint16_t v) { CPUERR = v; }
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uint16_t getPIR() const { return PIR; };
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void setPIR(const uint16_t v) { PIR = v; }
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uint16_t read_par(const uint32_t a, const int run_mode, const word_mode_t word_mode, const bool peek_only);
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uint16_t read_pdr(const uint32_t a, const int run_mode, const word_mode_t word_mode, const bool peek_only);
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void write_pdr(const uint32_t a, const int run_mode, const uint16_t value, const word_mode_t word_mode);
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void write_par(const uint32_t a, const int run_mode, const uint16_t value, const word_mode_t word_mode);
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};
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