#include <stddef.h>
#include <stdlib.h>

#include "kernel.h"
#include "process.h"

struct RunQ *
RunQ(size_t max_procs)
{
	struct RunQ *runq = malloc(sizeof(struct RunQ));
	runq->current_proc = NULL;
	runq->max_procs = max_procs;
	runq->proc_amount = 0;
	runq->next_proc_id = 1;

	return runq;
}

void
RUNQ_add_process(size_t max_page_accesses,
		size_t total_pages_owned)
{
	if (runq->proc_amount >= runq->max_procs)
		return;

	struct Process *new_p = Process(runq->next_proc_id, max_page_accesses, total_pages_owned);

	if (!runq->current_proc) {
		runq->current_proc = new_p;
		new_p->next = new_p;
		new_p->prev = new_p;
	} else {
		new_p->next = runq->current_proc;
		new_p->prev = runq->current_proc->prev;
		new_p->next->prev = new_p;
		new_p->prev->next = new_p;
		runq->current_proc = new_p;
	}

	runq->proc_amount++;
	runq->next_proc_id++;
}


void
KERNEL_page_fault(struct PageTableEntry *pt, size_t page_no)
{
	if (first_free_page) {
		pt[page_no].ppn = first_free_page->ppn;
		pt[page_no].p = 1;
	}
}