source: rtems/cpukit/score/inline/rtems/score/address.inl @ dc09259b

/** 
 *  @file  rtems/score/address.inl
 *
 *  This include file contains the bodies of the routines
 *  about addresses which are inlined.
 */

/*
 *  COPYRIGHT (c) 1989-2008.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.rtems.com/license/LICENSE.
 *
 *  $Id$
 */

#ifndef _RTEMS_SCORE_ADDRESS_H
# error "Never use <rtems/score/address.inl> directly; include <rtems/score/address.h> instead."
#endif

#ifndef _RTEMS_SCORE_ADDRESS_INL
#define _RTEMS_SCORE_ADDRESS_INL

/**
 *  @addtogroup ScoreAddress 
 *  @{
 */

/** @brief Add Offset to Address
 *
 *  This function is used to add an @a offset to a @a base address.
 *  It returns the resulting address.  This address is typically
 *  converted to an access type before being used further.
 *
 *  @param[in] base is the base address.
 *  @param[in] offset is the offset to add to @a base.
 *
 *  @return This method returns the resulting address.
 */
#include <rtems/bspIo.h>
RTEMS_INLINE_ROUTINE void *_Addresses_Add_offset (
  void       *base,
  intptr_t    offset
)
{
  return (void *)((intptr_t)base + offset);
}

/** @brief Subtract Offset from Offset
 *
 *  This function is used to subtract an @a offset from a @a base
 *  address.  It returns the resulting address.  This address is
 *  typically converted to an access type before being used further.
 *
 *  @param[in] base is the base address.
 *  @param[in] offset is the offset to subtract to @a base.
 *
 *  @return This method returns the resulting address.
 */

RTEMS_INLINE_ROUTINE void *_Addresses_Subtract_offset (
  void       *base,
  intptr_t    offset
)
{
  return (void *)((intptr_t)base - offset);
}

/** @brief Subtract Two Offsets
 *
 *  This function is used to subtract two addresses.  It returns the
 *  resulting offset.
 *
 *  @param[in] left is the address on the left hand side of the subtraction.
 *  @param[in] right is the address on the right hand side of the subtraction.
 *
 *  @return This method returns the resulting address.
 *
 *  @note  The cast of an address to an uint32_t makes this code
 *         dependent on an addresses being thirty two bits.
 */
RTEMS_INLINE_ROUTINE uint32_t   _Addresses_Subtract (
  void *left,
  void *right
)
{
  return ((char *) left - (char *) right);
}

/** @brief Is Address Aligned
 *
 *  This function returns TRUE if the given address is correctly
 *  aligned for this processor and FALSE otherwise.  Proper alignment
 *  is based on correctness and efficiency.
 *
 *  @param[in] address is the address being checked for alignment.
 *
 *  @return This method returns TRUE if the address is aligned and
 *          FALSE otherwise.
 */
RTEMS_INLINE_ROUTINE bool _Addresses_Is_aligned (
  void *address
)
{
#if (CPU_ALIGNMENT == 0)
    return TRUE;
#else
    return (((uintptr_t)address % CPU_ALIGNMENT) == 0);
#endif
}

/** @brief Is Address In Range
 *
 *  This function returns TRUE if the given address is within the
 *  memory range specified and FALSE otherwise.  base is the address
 *  of the first byte in the memory range and limit is the address
 *  of the last byte in the memory range.  The base address is
 *  assumed to be lower than the limit address.
 *
 *  @param[in] address is the address to check.
 *  @param[in] base is the lowest address of the range to check against.
 *  @param[in] limit is the highest address of the range to check against.
 *
 *  @return This method returns TRUE if the given @a address is within the
 *  memory range specified and FALSE otherwise.
 */
RTEMS_INLINE_ROUTINE bool _Addresses_Is_in_range (
  void *address,
  void *base,
  void *limit
)
{
  return (address >= base && address <= limit);
}

/**@}*/

#endif
/* end of include file */