64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
#ifndef CPU_INTERNAL_H
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#define CPU_INTERNAL_H
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#include "common.h"
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typedef enum {
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carry_flag = 0x01,
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zero_flag = 0x02,
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interrupt_flag = 0x04,
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decimal_flag = 0x08,
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break_flag = 0x10,
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unused_flag = 0x20,
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overflow_flag = 0x40,
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negative_flag = 0x80
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} cpu_p_flag;
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typedef enum {
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carry_bp = 0,
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zero_bp = 1,
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interrupt_bp = 2,
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decimal_bp = 3,
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break_bp = 4,
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unused_bp = 5,
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overflow_bp = 6,
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negative_bp = 7
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} cpu_p_bp;
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typedef struct {
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word PC; // Program Counter,
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byte SP; // Stack Pointer,
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byte A, X, Y; // Registers
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byte P; // Flag Register
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} CPU_STATE;
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extern CPU_STATE cpu;
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extern byte CPU_RAM[0x8000];
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extern int op_value, op_address; // Arguments for current instruction
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extern int op_cycles; // Additional instruction cycles used (e.g. when paging occurs)
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byte cpu_ram_read(word address);
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void cpu_ram_write(word address, byte data);
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// Interrupt Addresses
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word cpu_nmi_interrupt_address();
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word cpu_reset_interrupt_address();
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word cpu_irq_interrupt_address();
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// CPU Adressing Modes
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void cpu_address_implied();
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void cpu_address_immediate();
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void cpu_address_zero_page();
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void cpu_address_zero_page_x();
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void cpu_address_zero_page_y();
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void cpu_address_absolute();
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void cpu_address_absolute_x();
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void cpu_address_absolute_y();
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void cpu_address_relative();
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void cpu_address_indirect();
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void cpu_address_indirect_x();
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void cpu_address_indirect_y();
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#endif
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