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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. */

/* Prototypes */

void mtspr(uint16_t regno, const uorreg_t value);

uorreg_t mfspr(const uint16_t regno);

void sprs_status(void);

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

static inline void

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

{

  uorreg_t regvalue = cpu_state.sprs[regno];

  uorreg_t 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); */

  cpu_state.sprs[regno] = (regvalue & ~mask) | shifted;

}

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

static inline unsigned long

getsprbits(const int regno, const unsigned long mask)

{

  uorreg_t regvalue = cpu_state.sprs[regno];

  uorreg_t 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;

}