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/* i960 device support

   Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.

   Contributed by Cygnus Solutions.

This file is part of GDB, the GNU debugger.

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, 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.,

59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "sim-main.h"

#ifdef HAVE_DV_SOCKSER

#include "dv-sockser.h"

#endif

/* Handling the MSPR register is done by creating a device in the core

   mapping that winds up here.  */

device i960_devices;

int

device_io_read_buffer (device *me, void *source, int space,

                       address_word addr, unsigned nr_bytes,

                       SIM_DESC sd, SIM_CPU *cpu, sim_cia cia)

{

  if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)

    return nr_bytes;

#ifdef HAVE_DV_SOCKSER

  if (addr == UART_INCHAR_ADDR)

    {

      int c = dv_sockser_read (sd);

      if (c == -1)

        return 0;

      *(char *) source = c;

      return 1;

    }

  if (addr == UART_STATUS_ADDR)

    {

      int status = dv_sockser_status (sd);

      unsigned char *p = source;

      p[0] = 0;

      p[1] = (((status & DV_SOCKSER_INPUT_EMPTY)

#ifdef UART_INPUT_READY0

               ? UART_INPUT_READY : 0)

#else

               ? 0 : UART_INPUT_READY)

#endif

              + ((status & DV_SOCKSER_OUTPUT_EMPTY) ? UART_OUTPUT_READY : 0));

      return 2;

    }

#endif

  return nr_bytes;

}

int

device_io_write_buffer (device *me, const void *source, int space,

                        address_word addr, unsigned nr_bytes,

                        SIM_DESC sd, SIM_CPU *cpu, sim_cia cia)

{

#if WITH_SCACHE

  /* MSPR support is deprecated but is kept in for upward compatibility

     with existing overlay support.  */

  if (addr == MSPR_ADDR)

    {

      if ((*(const char *) source & MSPR_PURGE) != 0)

        scache_flush (sd);

      return nr_bytes;

    }

  if (addr == MCCR_ADDR)

    {

      if ((*(const char *) source & MCCR_CP) != 0)

        scache_flush (sd);

      return nr_bytes;

    }

#endif

  if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)

    return nr_bytes;

#if HAVE_DV_SOCKSER

  if (addr == UART_OUTCHAR_ADDR)

    {

      int rc = dv_sockser_write (sd, *(char *) source);

      return rc == 1;

    }

#endif

  return nr_bytes;

}

void

device_error (device *me, char *message, ...)

{

}