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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;
}