/*
 * kos.c -- starting point for student's os.
 * 
 */
#include <stdlib.h>

#include "simulator.h"

void KOS()
{
	int registers[NumTotalRegs];
	int i;
	
	bzero(main_memory, MemorySize);

	if (load_user_program("a.out") < 0) {
		fprintf(stderr,"Can't load program.\n");
		exit(1);
	}

	for (i=0; i < NumTotalRegs; i++)
		registers[i] = 0;

	/* set up the program counters and the stack register */

	registers[PCReg] = 0;
	registers[NextPCReg] = 4;

	/* need to back off from top of memory */
	/* 12 for argc, argv, envp */
	/* 12 for stack frame */
	registers[StackReg] = MemorySize - 24;

	printf("Running user code.\n");

	run_user_code(registers);
	
	/* not reached .. */
}