/**
* CoreCPU - The Quick6502 Project
* corecpu.c
*
* Created by Manoel Trapier on 24/02/08
* Copyright 2008 986 Corp. All rights reserved.
*
* $LastChangedDate$
* $Author$
* $HeadURL$
* $Revision$
*
*/
/* Depending on the OS, one of these provide the malloc function */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
{snap}
/**
* Initialise the CPU
*
* Inputs:
*
* - CPU Init structure:
* - Memory Read function pointer
* - Memory Write function pointer
* - Fast memory read function pointer (for opcodes read)
* - Fast page 0 function Read/Write
* - Fast page 1 function Read/Write
*
* Output:
*
* (void *): An opaque pointer to the internal structure of the CPU.
* NULL if an error occured !
*/
quick6502_cpu *quick6502_init(quick6502_cpuconfig *config)
{
quick6502_cpu *cpu;
/* Alloc structure */
cpu = (quick6502_cpu *) malloc (sizeof (quick6502_cpu));
if (!cpu)
return NULL;
/* Initialise other variables */
cpu->running = 0; /* CPU is currently NOT running */
cpu->cycle_done = 0;
/* Initialise registers */
cpu->reg_A = 0;
cpu->reg_X = 0;
cpu->reg_Y = 0;
cpu->reg_S = 0xFF;
cpu->reg_P = Q6502_D_FLAG | Q6502_I_FLAG;
if (config->memory_read != NULL)
cpu->memory_read = config->memory_read;
else
goto init_error;
if (config->memory_write != NULL)
cpu->memory_write = config->memory_write;
else
goto init_error;
if (config->memory_opcode_read != NULL)
cpu->memory_opcode_read = config->memory_opcode_read;
else
cpu->memory_opcode_read = config->memory_read;
if (config->memory_page0_read != NULL)
cpu->memory_page0_read = config->memory_page0_read;
else
cpu->memory_page0_read = config->memory_read;
if (config->memory_page0_write != NULL)
cpu->memory_page0_write = config->memory_page0_write;
else
cpu->memory_page0_write = config->memory_write;
if (config->memory_stack_read != NULL)
cpu->memory_stack_read = config->memory_stack_read;
else
cpu->memory_stack_read = config->memory_read;
if (config->memory_stack_write != NULL)
cpu->memory_stack_write = config->memory_stack_write;
else
cpu->memory_stack_write = config->memory_write;
return cpu;
init_error:
if (cpu)
free (cpu);
return NULL;
}
{snap}
/**
* Run cpu for at least X cycles
*
* Output:
*
* int: (Number of cycle really done) - (Number of cycle asked)
*/
int quick6502_run(quick6502_cpu *cpu, int cycles)
{
cpu->running = !0;
while(cpu->cycle_done < cycles)
{
quick6502_exec_one(cpu);
}
cpu->cycle_done -= cycles;
cpu->running = 0;
return cycles + cpu->cycle_done;
}
(pas mal de compilos font un warning pour ça, et puis plus généralement ça fait qu'on a du mal à savoir où se termine le commentaire : si tu mets juste une seule * en début de ligne on voit bcp mieux la différence entre deux commentaires consécutifs et un seul commentaire)
)
- où il avait admis qu'au moment du parsing, on devait gagner des quelques microsecondes 
)
