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/* inline/address.inl
*
* This include file contains the bodies of the routines
* about addresses which are inlined.
*
* COPYRIGHT (c) 1989-1999.
* 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.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#ifndef __INLINE_ADDRESSES_inl
#define __INLINE_ADDRESSES_inl
/*PAGE
*
* _Addresses_Add_offset
*
* DESCRIPTION:
*
* This function is used to add an offset to a base address.
* It returns the resulting address. This address is typically
* converted to an access type before being used further.
*/
RTEMS_INLINE_ROUTINE void *_Addresses_Add_offset (
void *base,
unsigned32 offset
)
{
return (void *)((char *)base + offset);
}
/*PAGE
*
* _Addresses_Subtract_offset
*
* DESCRIPTION:
*
* This function is used to subtract an offset from a base
* address. It returns the resulting address. This address is
* typically converted to an access type before being used further.
*/
RTEMS_INLINE_ROUTINE void *_Addresses_Subtract_offset (
void *base,
unsigned32 offset
)
{
return (void *)((char *)base - offset);
}
/*PAGE
*
* _Addresses_Subtract
*
* DESCRIPTION:
*
* This function is used to subtract two addresses. It returns the
* resulting offset.
*
* NOTE: The cast of an address to an unsigned32 makes this code
* dependent on an addresses being thirty two bits.
*/
RTEMS_INLINE_ROUTINE unsigned32 _Addresses_Subtract (
void *left,
void *right
)
{
return ((char *) left - (char *) right);
}
/*PAGE
*
* _Addresses_Is_aligned
*
* DESCRIPTION:
*
* 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.
*/
RTEMS_INLINE_ROUTINE boolean _Addresses_Is_aligned (
void *address
)
{
#if (CPU_ALIGNMENT == 0)
return TRUE;
#elif defined(RTEMS_CPU_HAS_16_BIT_ADDRESSES)
return ( ( (unsigned short)address % CPU_ALIGNMENT ) == 0 );
#else
return ( ( (unsigned32)address % CPU_ALIGNMENT ) == 0 );
#endif
}
/*PAGE
*
* _Addresses_Is_in_range
*
* DESCRIPTION:
*
* 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.
*/
RTEMS_INLINE_ROUTINE boolean _Addresses_Is_in_range (
void *address,
void *base,
void *limit
)
{
return ( address >= base && address <= limit );
}
#endif
/* end of include file */
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