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/* sprs.h -- OR1K architecture specific 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. */
 
#include "spr_defs.h"
 
typedef unsigned long sprword;
 
/* Prototypes */
inline void mtspr(const int regno, const sprword value);
inline sprword mfspr_(const int regno);
#ifdef DEBUGMOD_OFF
extern sprword sprs[MAX_SPRS];
extern int cont_run;   /* defined in toplevel.c */
#define mfspr(regno)\
 ((regno == SPR_SR && temp_disable_except > 0)?(sprs[regno] & ~SPR_SR_EXR)\
  :((regno < MAX_SPRS)?(sprs[regno])\
  :((printf("\nABORT: read out of SPR range %08X\n", regno),\
    cont_run = 0))))
#else /* DEBUGMOD_OFF */
#define mfspr(regno) mfspr_(regno)
#endif /* DEBUGMOD_OFF */
 
inline void setsprbit(const int regno, const int bitnum, const unsigned long bitvalue);
inline int getsprbit(const int regno, const int bitnum);
void sprs_status();
 
#include "sim-config.h"
 
/* Ugly, but fast */
/* Get a specific SPR. */
static inline sprword
mfspr_(const int regno)
{
  extern unsigned long reg[32];
  extern unsigned long pc;
  extern unsigned long pcprev;
  extern sprword sprs[MAX_SPRS];
 
  switch (regno) {
  case SPR_SR:
    /* Exceptions are always enabled */
    return sprs[regno] | SPR_SR_EXR;
  case SPR_NPC:
    return pc;
  case SPR_PPC:
    return pcprev;
  default:
    /* Links to GPRS */
    if(regno >= 0x0400 && regno < 0x0420)
      return reg[regno - 0x0400];
    else if (regno < MAX_SPRS)
      return sprs[regno];
  }
  if (config.sim.verbose)
    printf ("WARNING: read out of SPR range %08X\n", regno);
  return 0;
}