133 lines
4.2 KiB
C
133 lines
4.2 KiB
C
/*
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* Apple // emulator for *ix
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*
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* This software package is subject to the GNU General Public License
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* version 3 or later (your choice) as published by the Free Software
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* Foundation.
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*
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* Copyright 1994 Alexander Jean-Claude Bottema
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* Copyright 1995 Stephen Lee
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* Copyright 1997, 1998 Aaron Culliney
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* Copyright 1998, 1999, 2000 Michael Deutschmann
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* Copyright 2013-2015 Aaron Culliney
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*
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*/
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#ifndef __CPU_H_
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#define __CPU_H_
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// Virtual machine is an Apple //e (not an NES, etc...)
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#define APPLE2_VM 1
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#if !defined(__ASSEMBLER__)
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#include <sys/types.h>
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#include <stdint.h>
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/* types */
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#define MEM_READ_FLAG (1<<0)
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#define MEM_WRITE_FLAG (1<<1)
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extern uint16_t cpu65_pc; // Program counter
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extern uint8_t cpu65_a; // Accumulator
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extern uint8_t cpu65_f; // Flags (host-order)
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extern uint8_t cpu65_x; // X Index register
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extern uint8_t cpu65_y; // Y Index register
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extern uint8_t cpu65_sp; // Stack Pointer
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extern uint16_t cpu65_ea; // Last effective address
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extern uint8_t cpu65_d; // Last data byte written
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extern uint8_t cpu65_rw; // MEM_READ_FLAG = read occured, MEM_WRITE_FLAG = write
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extern uint8_t cpu65_opcode; // Last opcode
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extern uint8_t cpu65_opcycles; // Last opcode extra cycles
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/* Set up the processor for a new run. Sets up opcode table. */
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extern void cpu65_init();
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/* Interrupt the processor */
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extern void cpu65_interrupt(int reason);
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extern void cpu65_uninterrupt(int reason);
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extern void cpu65_run(void);
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extern void cpu65_reboot(void);
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extern void cpu65_direct_write(int ea,int data);
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extern void *cpu65_vmem_r[65536];
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extern void *cpu65_vmem_w[65536];
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extern unsigned char cpu65_flags_encode[256];
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extern unsigned char cpu65_flags_decode[256];
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extern int32_t cpu65_cycle_count;
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#if CPU_TRACING
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void cpu65_trace_begin(const char *trace_file);
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void cpu65_trace_end(void);
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void cpu65_trace_toggle(const char *trace_file);
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void cpu65_trace_checkpoint(void);
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#endif
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#endif /* !__ASSEMBLER__ */
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#define ResetSig 0x02
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#define IRQ6522 0x08
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#define IRQSpeech 0x10
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#define IRQSSC 0x20
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#define IRQMouse 0x40
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#define IRQGeneric 0x80
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/* Note: These are *not* the bit positions used for the flags in the P
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* register of a real 65c02. Rather, they have been distorted so that C,
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* N, Z, etc match the analogous flags in the host flags register.
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*/
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#if defined(__i386__) || defined(__x86_64__)
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/*
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* x86 NOTE: V matches the position of the overflow flag in the high byte
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* of the 80386 register.
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*/
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# define C_Flag_Bit 8 /* 6502 Carry */
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# define C_Flag (C_Flag_Bit>>3) /* 6502 Carry */
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# define X_Flag 0x2 /* 6502 Xtra */
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# define I_Flag 0x4 /* 6502 Interrupt disable */
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# define V_Flag 0x8 /* 6502 oVerflow */
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# define B_Flag 0x10 /* 6502 Break */
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# define D_Flag 0x20 /* 6502 Decimal mode */
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# define Z_Flag 0x40 /* 6502 Zero */
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# define N_Flag 0x80 /* 6502 Negative */
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#elif defined(__arm__)
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// VCZN positions match positions of shifted status register
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# define V_Flag 0x1
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# define C_Flag 0x2
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# define Z_Flag 0x4
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# define N_Flag 0x8
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# define NZ_Flags 0xC
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# define NZC_Flags 0xE
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# define NVZ_Flags 0xD
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# define NVZC_Flags 0xF
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# define X_Flag 0x10
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# define I_Flag 0x20
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# define B_Flag 0x40
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# define D_Flag 0x80
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# define BX_Flags 0x50
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# define BI_Flags 0x60
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#elif defined(__aarch64__)
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# error soon ...
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#else
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# error unknown machine architecture
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#endif
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/*
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* 6502 flags bit mask
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*/
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#define C_Flag_6502 0x1 // [C]arry
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#define Z_Flag_6502 0x2 // [Z]ero
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#define I_Flag_6502 0x4 // [I]nterrupt
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#define D_Flag_6502 0x8 // [D]ecimal
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#define B_Flag_6502 0x10 // [B]reak
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#define X_Flag_6502 0x20 // [X]tra (reserved)...
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#define V_Flag_6502 0x40 // o[V]erflow
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#define N_Flag_6502 0x80 // [N]egative
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#endif // whole file
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