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/* sprs.c -- Simulation of OR1K special-purpose registers

   Copyright (C) 1999 Damjan Lampret, lampret@opencores.org

This file is part of OpenRISC 1000 Architectural Simulator.

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 2 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, write to the Free Software

Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

/* Most of the general OR1K architecture simulation (not specific

   to OR32 or OR16 ISA) is done in this file. */

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include "arch.h"

#include "sprs.h"

extern int cont_run;

sprword sprs[MAX_SPRS];

/* Set a specific SPR with a value. */

void mtsr(int regno, sprword value)

{

        if (regno < MAX_SPRS)

                sprs[regno] = value;

        else {

                printf("\nEXCEPTION: write out of SPR's range\n");

                cont_run = 0;

        }

        return;

}

/* Get a specific SPR. */

sprword mfsr(int regno)

{

        if (regno < MAX_SPRS)

                return sprs[regno];

        else {

                printf("\nEXCEPTION: read out of SPR's range\n");

                cont_run = 0;

        }

        return 0;

}

/* Set a specific bit from SPR. LSB in a word is numbered zero. */

void setsprbit(int regno, int bitnum, unsigned long bitvalue)

{

        sprword mask;

        sprword regvalue = mfsr(regno);

        mask = ~(1 << bitnum);

        mtsr(regno, (regvalue & mask) | ((bitvalue & 0x1) << bitnum));

        return;

}

/* Get a specific bit from SPR. */

int getsprbit(int regno, int bitnum)

{

        sprword regvalue = mfsr(regno);

        return (regvalue >> bitnum) & 0x1;

}