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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);

static 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 */

static inline void setsprbit(const int regno, const int bitnum, const unsigned long bitvalue);

static 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;

}

/* Set specific SPR bit(s) identified by mask. */

static inline void

setsprbits(const int regno, const unsigned long mask, const unsigned long value)

{

  sprword regvalue = mfspr(regno);

  sprword shifted = 0x0;

  int m, v = 0;

  /* m counts bits in valuemask */

  /* v counts bits in value */

  for (m = 0; m < 32; m++)

    if ((mask >> m) & 0x1) {

      shifted |= ((value >> v) & 0x1) << m;

      v++;

    }

  /* printf("oldvalue %x setsprbits(%x, %x, %x)  shifted %x", regvalue, regno, mask, value, shifted); */

  mtspr(regno, (regvalue & ~mask) | shifted);

  return;

}

/* Get specific SPR bit(s) identified by mask. */

static inline unsigned long

getsprbits(const int regno, const unsigned long mask)

{

  sprword regvalue = mfspr(regno);

  sprword shifted = 0x0;

  int m, v = 0;

  /* m counts bits in valuemask */

  /* v counts bits in regvalue */

  for (m = 0; m < 32; m++)

    if ((mask >> m) & 0x1) {

      shifted |= ((regvalue >> m) & 0x1) << v;

      v++;

    }

  return shifted;

}

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

static inline void

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

{

  sprword mask;

  sprword regvalue = mfspr(regno);

  mask = ~(1 << bitnum);

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

  return;

}

/* Get a specific bit from SPR. */

static inline int

getsprbit(const int regno, const int bitnum)

{

  sprword regvalue = mfspr(regno);

  return (regvalue >> bitnum) & 0x1;

}

/* Get specific SPR bit(s) identified by mask. */

static inline unsigned long

testsprbits(const int regno, const unsigned long mask)

{

  sprword regvalue = mfspr(regno);

  return regvalue & mask;

}