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// cpu.h -- cpu.c public declarations and defines.
// Copyright (C) 2012 Chris J. Baird <cjb@brushtail.apana.org.au>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>
// derived from unlicenced/BSD-2clause code by Charlie Somerville
// https://github.com/charliesome/6502
#ifndef CPU_H
#define CPU_H
#define FCARRY 1 /* "C" */
#define FZERO 2 /* "Z" */
#define FIRQ 4 /* "I" */
#define FBCD 8 /* "D" */
#define FBRK 16 /* "B" */
#define FOFLOW 64 /* "V" */
#define FNEG 128 /* "N" */
#define GET_FLAG(state,flag) ((state)->regs.flags & (flag))
#define SET_FLAG(state,flag) (state)->regs.flags |= (flag)
#define CLEAR_FLAG(state,flag) (state)->regs.flags &= ~(flag);
#define FLAG_IF(state,flag,condition) \
if(condition) { SET_FLAG(state,flag); } \
else { CLEAR_FLAG(state,flag); }
typedef struct reg
{ unsigned short pc;
unsigned char sp;
unsigned char a;
unsigned char x;
unsigned char y;
unsigned char flags;
} reg_t;
struct mmapseg;
typedef struct cpu
{ unsigned char* mem;
reg_t regs;
struct mmapseg* mmapped_chain_head;
struct mmapseg* mmapped_chain_tail;
} cpu_t;
typedef struct mmapseg
{ unsigned short address;
unsigned short length;
unsigned char(*get)(cpu_t*, unsigned short);
void(*set)(cpu_t*, unsigned short, unsigned char);
struct mmapseg* next;
} mmapseg_t;
cpu_t* new_cpu();
void cpu_push_8(cpu_t* cpu, unsigned char val);
void cpu_push_16(cpu_t* cpu, unsigned short val);
unsigned char cpu_pop_8(cpu_t* cpu);
unsigned short cpu_pop_16(cpu_t* cpu);
void cpu_nmi(cpu_t* cpu);
void cpu_rst(cpu_t* cpu);
void cpu_brk(cpu_t* cpu);
void cpu_mmap(cpu_t* cpu, mmapseg_t* segment);
unsigned char cpu_peek(cpu_t* cpu, unsigned short address);
void cpu_poke(cpu_t* cpu, unsigned short address, unsigned char val);
unsigned short cpu_peek_16(cpu_t* cpu, unsigned short address);
#endif /* CPU_H */
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