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/**
* @file rtems/score/prioritybitmap.inl
*
* This file contains the static inline implementation of all inlined
* routines in the Priority Handler bit map implementation
*/
/*
* COPYRIGHT (c) 1989-2010.
* 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_PRIORITYBITMAP_H
# error "Never use <rtems/score/prioritybitmap.inl> directly; include <rtems/score/prioritybitmap.h> instead."
#endif
#ifndef _RTEMS_SCORE_PRIORITYBITMAP_INL
#define _RTEMS_SCORE_PRIORITYBITMAP_INL
/**
* @addtogroup ScorePriority
* @{
*/
#include <rtems/score/bitfield.h>
/**
* This function returns the major portion of the_priority.
*/
RTEMS_INLINE_ROUTINE Priority_bit_map_Control _Priority_Major (
Priority_Control the_priority
)
{
return (Priority_bit_map_Control)( the_priority / 16 );
}
/**
* This function returns the minor portion of the_priority.
*/
RTEMS_INLINE_ROUTINE Priority_bit_map_Control _Priority_Minor (
Priority_Control the_priority
)
{
return (Priority_bit_map_Control)( the_priority % 16 );
}
#if ( CPU_USE_GENERIC_BITFIELD_CODE == TRUE )
/**
* This function returns the mask associated with the major or minor
* number passed to it.
*/
RTEMS_INLINE_ROUTINE Priority_bit_map_Control _Priority_Mask (
uint32_t bit_number
)
{
return (Priority_bit_map_Control)(0x8000u >> bit_number);
}
/**
* This function returns the mask bit inverted.
*/
RTEMS_INLINE_ROUTINE Priority_bit_map_Control _Priority_Mask_invert (
uint32_t mask
)
{
return (Priority_bit_map_Control)(~mask);
}
/**
* This function translates the bit numbers returned by the bit scan
* of a priority bit field into something suitable for use as
* a major or minor component of a priority.
*/
RTEMS_INLINE_ROUTINE uint32_t _Priority_Bits_index (
uint32_t bit_number
)
{
return bit_number;
}
#endif
/**
* Priority Queue implemented by bit map
*/
/**
* This routine performs the initialization necessary for this handler.
*/
RTEMS_INLINE_ROUTINE void _Priority_bit_map_Handler_initialization( void )
{
int index;
_Priority_Major_bit_map = 0;
for ( index=0 ; index <16 ; index++ )
_Priority_Bit_map[ index ] = 0;
}
/**
* This routine uses the_priority_map to update the priority
* bit maps to indicate that a thread has been readied.
*/
RTEMS_INLINE_ROUTINE void _Priority_bit_map_Add (
Priority_bit_map_Information *the_priority_map
)
{
*the_priority_map->minor |= the_priority_map->ready_minor;
_Priority_Major_bit_map |= the_priority_map->ready_major;
}
/**
* This routine uses the_priority_map to update the priority
* bit maps to indicate that a thread has been removed from the
* ready state.
*/
RTEMS_INLINE_ROUTINE void _Priority_bit_map_Remove (
Priority_bit_map_Information *the_priority_map
)
{
*the_priority_map->minor &= the_priority_map->block_minor;
if ( *the_priority_map->minor == 0 )
_Priority_Major_bit_map &= the_priority_map->block_major;
}
/**
* This function returns the priority of the highest priority
* ready thread.
*/
RTEMS_INLINE_ROUTINE Priority_Control _Priority_bit_map_Get_highest( void )
{
Priority_bit_map_Control minor;
Priority_bit_map_Control major;
_Bitfield_Find_first_bit( _Priority_Major_bit_map, major );
_Bitfield_Find_first_bit( _Priority_Bit_map[major], minor );
return (_Priority_Bits_index( major ) << 4) +
_Priority_Bits_index( minor );
}
/**
* This routine initializes the_priority_map so that it
* contains the information necessary to manage a thread
* at new_priority.
*/
RTEMS_INLINE_ROUTINE void _Priority_bit_map_Initialize_information(
Priority_bit_map_Information *the_priority_map,
Priority_Control new_priority
)
{
Priority_bit_map_Control major;
Priority_bit_map_Control minor;
Priority_bit_map_Control mask;
major = _Priority_Major( new_priority );
minor = _Priority_Minor( new_priority );
the_priority_map->minor =
&_Priority_Bit_map[ _Priority_Bits_index(major) ];
mask = _Priority_Mask( major );
the_priority_map->ready_major = mask;
/* Add _Priority_Mask_invert to non-generic bitfield then change this code. */
the_priority_map->block_major = (Priority_bit_map_Control)(~((uint32_t)mask));
mask = _Priority_Mask( minor );
the_priority_map->ready_minor = mask;
/* Add _Priority_Mask_invert to non-generic bitfield then change this code. */
the_priority_map->block_minor = (Priority_bit_map_Control)(~((uint32_t)mask));
}
/**@}*/
#endif
/* end of include file */
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