First/simdata.c

/* simdata.c

   This file is part of the "First" CPU simulator project.

   Copyright (c) 2024 Efthymios Kritikos

   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/>.  */

#include <stdlib.h>
#include "simdata.h"
#include <stdio.h>

struct simdata_t *init_simdata(){
	struct simdata_t * ret=malloc(sizeof(struct simdata_t));

	if(!ret){
		ret->current_clock=0;
		return 0;
	}

	ret->RAM=malloc(16777216); //Maximum addressable memory
	if(!ret->RAM){
		printf("failed to allocate 16MiB of memory for the system ram");
		free(ret);
		return 0;
	}

	ret->registers=NULL;
	ret->cpu_state=CPU_RUNNING;
	ret->cpu_gui_hints=malloc(sizeof(struct cpu_gui_hints_t));
	ret->cpu_gui_hints->decoding_list=NULL;
	ret->cpu_gui_hints->fetching_list=NULL;
	ret->cpu_gui_hints->executing_list=NULL;

	return ret;
}

void free_instr_list(struct instr_list_t **addr_of_tofree){
	struct instr_list_t *tofree=*addr_of_tofree;
	while(tofree){
		struct instr_list_t *temp=tofree;
		tofree=tofree->next;
		free(temp);
	}
	*addr_of_tofree=0;
}

int add_to_instr_list(struct instr_list_t **toadd,uint32_t address){
	while(*toadd){
		toadd=&((*toadd)->next);
	}
	*toadd=malloc(sizeof(struct instr_list_t));
	(*toadd)->address=address;
	(*toadd)->next=NULL;
	return 0;
}

void free_simdata(struct simdata_t *p){
	free(p->RAM);
	free_instr_list(&p->cpu_gui_hints->decoding_list);
	free_instr_list(&p->cpu_gui_hints->fetching_list);
	free_instr_list(&p->cpu_gui_hints->executing_list);
	free(p->cpu_gui_hints);
	free(p);
}