mirror of https://github.com/st3fan/ewm.git
135 lines
4.4 KiB
C
135 lines
4.4 KiB
C
// The MIT License (MIT)
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//
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// Copyright (c) 2015 Stefan Arentz - http://github.com/st3fan/ewm
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#ifndef CPU_H
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#define CPU_H
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#define EWM_CPU_MODEL_6502 0
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#define EWM_CPU_MODEL_65C02 1
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#define EWM_CPU_ERR_UNIMPLEMENTED_INSTRUCTION (-1)
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#define EWM_CPU_ERR_STACK_OVERFLOW (-2)
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#define EWM_CPU_ERR_STACK_UNDERFLOW (-3)
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#define EWM_VECTOR_NMI 0xfffa
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#define EWM_VECTOR_RES 0xfffc
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#define EWM_VECTOR_IRQ 0xfffe
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struct cpu_instruction_t;
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struct ewm_lua_t;
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struct cpu_state_t {
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uint8_t a, x, y, s, sp;
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uint16_t pc;
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uint8_t n, v, b, d, i, z, c;
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};
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struct cpu_t {
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int model;
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struct cpu_state_t state;
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FILE *trace;
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bool strict;
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struct mem_t *mem;
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struct cpu_instruction_t *instructions;
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uint64_t counter;
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uint8_t *ram;
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size_t ram_size;
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#if defined(EWM_LUA)
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struct ewm_lua_t *lua;
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#endif
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};
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typedef void (*cpu_instruction_handler_t)(struct cpu_t *cpu);
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typedef void (*cpu_instruction_handler_byte_t)(struct cpu_t *cpu, uint8_t oper);
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typedef void (*cpu_instruction_handler_word_t)(struct cpu_t *cpu, uint16_t oper);
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#define MEM_FLAGS_READ 0x01
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#define MEM_FLAGS_WRITE 0x02
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typedef uint8_t (*mem_read_handler_t)(struct cpu_t *cpu, struct mem_t *mem, uint16_t addr);
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typedef void (*mem_write_handler_t)(struct cpu_t *cpu, struct mem_t *mem, uint16_t addr, uint8_t b);
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struct mem_t {
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bool enabled;
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uint8_t flags;
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uint16_t start;
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uint16_t end;
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void *obj;
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mem_read_handler_t read_handler;
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mem_write_handler_t write_handler;
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char *description;
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struct mem_t *next;
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};
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// Private. How do we keep them private?
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void _cpu_push_byte(struct cpu_t *cpu, uint8_t b);
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void _cpu_push_word(struct cpu_t *cpu, uint16_t w);
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uint8_t _cpu_pull_byte(struct cpu_t *cpu);
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uint16_t _cpu_pull_word(struct cpu_t *cpu);
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uint8_t _cpu_stack_free(struct cpu_t *cpu);
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uint8_t _cpu_stack_used(struct cpu_t *cpu);
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// Private. How do we keep them private?
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uint8_t _cpu_get_status(struct cpu_t *cpu);
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void _cpu_set_status(struct cpu_t *cpu, uint8_t status);
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struct cpu_t *cpu_create(int model);
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void cpu_destroy(struct cpu_t *cpu);
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struct mem_t *cpu_add_mem(struct cpu_t *cpu, struct mem_t *mem);
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struct mem_t *cpu_add_ram(struct cpu_t *cpu, uint16_t start, uint16_t end);
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struct mem_t *cpu_add_ram_data(struct cpu_t *cpu, uint16_t start, uint16_t end, uint8_t *data);
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struct mem_t *cpu_add_ram_file(struct cpu_t *cpu, uint16_t start, char *path);
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struct mem_t *cpu_add_rom_data(struct cpu_t *cpu, uint16_t start, uint16_t end, uint8_t *data);
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struct mem_t *cpu_add_rom_file(struct cpu_t *cpu, uint16_t start, char *path);
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struct mem_t *cpu_add_iom(struct cpu_t *cpu, uint16_t start, uint16_t end, void *obj, mem_read_handler_t read_handler, mem_write_handler_t write_handler);
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void cpu_optimize_memory(struct cpu_t *cpu);
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void cpu_strict(struct cpu_t *cpu, bool strict);
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int cpu_trace(struct cpu_t *cpu, char *path);
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void cpu_reset(struct cpu_t *cpu);
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int cpu_irq(struct cpu_t *cpu);
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int cpu_nmi(struct cpu_t *cpu);
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int cpu_step(struct cpu_t *cpu);
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uint16_t cpu_memory_get_word(struct cpu_t *cpu, uint16_t addr);
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uint8_t cpu_memory_get_byte(struct cpu_t *cpu, uint16_t addr);
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void cpu_memory_set_word(struct cpu_t *cpu, uint16_t addr, uint16_t v);
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void cpu_memory_set_byte(struct cpu_t *cpu, uint16_t addr, uint8_t v);
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#if defined(EWM_LUA)
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int ewm_cpu_init_lua(struct cpu_t *cpu, struct ewm_lua_t *lua);
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#endif
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#endif
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