/* Author      : Rick van der Zwet
 * S-number    : 0433373
 * Version     : $Id: constant.c 361 2007-12-03 04:27:55Z rick $
 * Copyright   : FreeBSD Licence
 * Description : MIPS simulator. Main module
 */

#include <stdlib.h>
#include <stdio.h>
#include <sysexits.h>
#include "sim.h"
#include "constant.h"

word
constant_call(const const_control_t action)
{
    word out = 0;
    switch (action) {
    case C0:
        out = 0;
        break;
    case C1:
        out = 1;
        break;
    case C2:
        out = 2;
        break;
    case C3:
        out = 3;
        break;
    case C4:
        out = 4;
        break;
    case C5:
        out = 8;
        break;
    case C6:
        out = 16;
        break;
    case C7:
        out = 24;
        break;
    case C8:
        out = 31;
        break;
    case C9:
        /* 11110000 00000000 00000000 00000000 */
        out = 0x1E000000;
        break;
    case C10:
        /* 00000000 00000000 11111111 11111111 */
        out = 0x0000FFFF;
        break;
    case C11:
        /* 00000000 11111111 11111111 11111111 */
        out = 0x00FFFFFF;
        break;
    case C12:
        /* 11111111 11111111 11111111 11111100 */
        out = 0xFFFFFFFC;
        break;
    default:
        fprintf(stderr, "Constant action not implemented\n");
        exit(EX_SOFTWARE);
        break;
    }
    return (out);
}