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+/* priority.inl
+ *
+ * This file contains the static inline implementation of all inlined
+ * routines in the Priority Handler.
+ *
+ * COPYRIGHT (c) 1989-1997.
+ * On-Line Applications Research Corporation (OAR).
+ * Copyright assigned to U.S. Government, 1994.
+ *
+ * The license and distribution terms for this file may in
+ * the file LICENSE in this distribution or at
+ * http://www.OARcorp.com/rtems/license.html.
+ *
+ * $Id$
+ */
+
+#ifndef __PRIORITY_inl
+#define __PRIORITY_inl
+
+#include <rtems/score/bitfield.h>
+
+/*PAGE
+ *
+ * _Priority_Handler_initialization
+ *
+ * DESCRIPTION:
+ *
+ * This routine performs the initialization necessary for this handler.
+ */
+
+RTEMS_INLINE_ROUTINE void _Priority_Handler_initialization( void )
+{
+ unsigned32 index;
+
+ _Priority_Major_bit_map = 0;
+ for ( index=0 ; index <16 ; index++ )
+ _Priority_Bit_map[ index ] = 0;
+}
+
+/*PAGE
+ *
+ * _Priority_Is_valid
+ *
+ * DESCRIPTION:
+ *
+ * This function returns TRUE if the_priority if valid for a
+ * user task, and FALSE otherwise.
+ */
+
+RTEMS_INLINE_ROUTINE boolean _Priority_Is_valid (
+ Priority_Control the_priority
+)
+{
+ /*
+ * Since PRIORITY_MINIMUM is 0 and priorities are stored unsigned,
+ * then checking for less than 0 is unnecessary.
+ */
+
+ return ( the_priority <= PRIORITY_MAXIMUM );
+}
+
+/*PAGE
+ *
+ * _Priority_Major
+ *
+ * DESCRIPTION:
+ *
+ * This function returns the major portion of the_priority.
+ */
+
+RTEMS_INLINE_ROUTINE unsigned32 _Priority_Major (
+ Priority_Control the_priority
+)
+{
+ return ( the_priority / 16 );
+}
+
+/*PAGE
+ *
+ * _Priority_Minor
+ *
+ * DESCRIPTION:
+ *
+ * This function returns the minor portion of the_priority.
+ */
+
+RTEMS_INLINE_ROUTINE unsigned32 _Priority_Minor (
+ Priority_Control the_priority
+)
+{
+ return ( the_priority % 16 );
+}
+
+#if ( CPU_USE_GENERIC_BITFIELD_CODE == TRUE )
+
+/*PAGE
+ *
+ * _Priority_Mask
+ *
+ * DESCRIPTION:
+ *
+ * This function returns the mask associated with the major or minor
+ * number passed to it.
+ */
+
+RTEMS_INLINE_ROUTINE unsigned32 _Priority_Mask (
+ unsigned32 bit_number
+)
+{
+ return (0x8000 >> bit_number);
+}
+
+
+/*PAGE
+ *
+ * _Priority_Bits_index
+ *
+ * DESCRIPTION:
+ *
+ * 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 unsigned32 _Priority_Bits_index (
+ unsigned32 bit_number
+)
+{
+ return bit_number;
+}
+
+#endif
+
+/*PAGE
+ *
+ * _Priority_Add_to_bit_map
+ *
+ * DESCRIPTION:
+ *
+ * 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_Add_to_bit_map (
+ Priority_Information *the_priority_map
+)
+{
+ *the_priority_map->minor |= the_priority_map->ready_minor;
+ _Priority_Major_bit_map |= the_priority_map->ready_major;
+}
+
+/*PAGE
+ *
+ * _Priority_Remove_from_bit_map
+ *
+ * DESCRIPTION:
+ *
+ * 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_Remove_from_bit_map (
+ Priority_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;
+}
+
+/*PAGE
+ *
+ * _Priority_Get_highest
+ *
+ * DESCRIPTION:
+ *
+ * This function returns the priority of the highest priority
+ * ready thread.
+ */
+
+RTEMS_INLINE_ROUTINE Priority_Control _Priority_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 );
+}
+
+/*PAGE
+ *
+ * _Priority_Initialize_information
+ *
+ * DESCRIPTION:
+ *
+ * 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_Initialize_information(
+ Priority_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;
+ the_priority_map->block_major = ~mask;
+
+ mask = _Priority_Mask( minor );
+ the_priority_map->ready_minor = mask;
+ the_priority_map->block_minor = ~mask;
+}
+
+/*PAGE
+ *
+ * _Priority_Is_group_empty
+ *
+ * DESCRIPTION:
+ *
+ * This function returns TRUE if the priority GROUP is empty, and
+ * FALSE otherwise.
+ */
+
+RTEMS_INLINE_ROUTINE boolean _Priority_Is_group_empty (
+ Priority_Control the_priority
+)
+{
+ return the_priority == 0;
+}
+
+#endif
+/* end of include file */