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/* upcall-basic.c. Test of Or1ksim basic handling of upcalls

   Copyright (C) 2010 Embecosm Limited

   Contributors various OpenCores participants

   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>

   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 3 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, see <http:  www.gnu.org/licenses/>.  */

/* ----------------------------------------------------------------------------

   This code is commented throughout for use with Doxygen.

   --------------------------------------------------------------------------*/

#include "support.h"

#include "spr-defs.h"

#include "board.h"

/*!Alignment exception handler defined here. */

unsigned long excpt_align;

/* --------------------------------------------------------------------------*/

/*!Write a memory mapped byte register

   @param[in] addr   Memory mapped address

   @param[in] value  Value to set                                            */

/* --------------------------------------------------------------------------*/

static void

setreg8 (unsigned long int  addr,

         unsigned char      value)

{

  *((volatile unsigned char *) addr) = value;

  printf ("Wrote byte at 0x%08lx = 0x%02x.\n", addr, value);

}       /* setreg8 () */

/* --------------------------------------------------------------------------*/

/*!Write a memory mapped half word register

   @param[in] addr   Memory mapped address

   @param[in] value  Value to set                                            */

/* --------------------------------------------------------------------------*/

static void

setreg16 (unsigned long int   addr,

          unsigned short int  value)

{

  *((volatile unsigned short int *) addr) = value;

  printf ("Wrote half word at 0x%08lx = 0x%04x.\n", addr, value);

}       /* setreg16 () */

/* --------------------------------------------------------------------------*/

/*!Write a memory mapped full word register

   @param[in] addr   Memory mapped address

   @param[in] value  Value to set                                            */

/* --------------------------------------------------------------------------*/

static void

setreg32 (unsigned long int  addr,

          unsigned long int  value)

{

  *((volatile unsigned long int *) addr) = value;

  printf ("Wrote full word at 0x%08lx = 0x%08lx.\n", addr, value);

}       /* setreg32 () */

/* --------------------------------------------------------------------------*/

/*!Read a memory mapped byte register

   @param[in] addr   Memory mapped address

   @return  Value read                                                       */

/* --------------------------------------------------------------------------*/

unsigned char

getreg8 (unsigned long int  addr)

{

  unsigned char  res = *((volatile unsigned char *) addr);

  printf ("Read byte at 0x%08lx = 0x%02x.\n", addr, res);

  return  res;

}       /* getreg8 () */

/* --------------------------------------------------------------------------*/

/*!Read a memory mapped half word register

   @param[in] addr   Memory mapped address

   @return  Value read                                                       */

/* --------------------------------------------------------------------------*/

unsigned short int

getreg16 (unsigned long int  addr)

{

  unsigned short int  res = *((volatile unsigned short int *) addr);

  printf ("Read half word at 0x%08lx = 0x%04x.\n", addr, res);

  return  res;

}       /* getreg16 () */

/* --------------------------------------------------------------------------*/

/*!Read a memory mapped full word register

   @param[in] addr   Memory mapped address

   @return  Value read                                                       */

/* --------------------------------------------------------------------------*/

unsigned long int

getreg32 (unsigned long int  addr)

{

  unsigned long int  res = *((volatile unsigned long int *) addr);

  printf ("Read full word at 0x%08lx = 0x%08lx.\n", addr, res);

  return  res;

}       /* getreg32 () */

/* --------------------------------------------------------------------------*/

/*! Exception handler for misalignment.

  Notes what has happened.                                                   */

/* --------------------------------------------------------------------------*/

void align_handler (void)

{

  printf ("Misaligned access.\n");

}       /* align_handler () */

/* --------------------------------------------------------------------------*/

/*!Main program to read and write memory mapped registers

   All these calls should be correctly aligned, but we set an handler, just in

   case.

   @return  The return code from the program (always zero).                  */

/* --------------------------------------------------------------------------*/

int

main ()

{

  /* Set the exception handler */

  printf ("Setting alignment exception handler.\n");

  excpt_align = (unsigned long)align_handler;

  /* Write some registers */

  printf ("Writing registers.\n");

  /* Byte aligned */

  setreg8 (GENERIC_BASE,     0xde);

  setreg8 (GENERIC_BASE + 1, 0xad);

  setreg8 (GENERIC_BASE + 2, 0xbe);

  setreg8 (GENERIC_BASE + 3, 0xef);

  /* Half word aligned */

  setreg16 (GENERIC_BASE + 4, 0xbaad);

  setreg16 (GENERIC_BASE + 6, 0xf00d);

  /* Full word aligned */

  setreg32 (GENERIC_BASE + 8, 0xcafebabe);

  /* Read some registers, but mix up which size from where. */

  printf ("Reading registers.\n");

  /* Full word aligned */

  (void)getreg32 (GENERIC_BASE + 0);

  /* Byte aligned */

  (void)getreg8 (GENERIC_BASE + 4);

  (void)getreg8 (GENERIC_BASE + 5);

  (void)getreg8 (GENERIC_BASE + 6);

  (void)getreg8 (GENERIC_BASE + 7);

  /* Half word aligned */

  (void)getreg16 (GENERIC_BASE +  8);

  (void)getreg16 (GENERIC_BASE + 10);

  /* All done */

  printf ("All done.\n");

  report (0xdeaddead);

  return 0;

}       /* main () */