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/* context.h
*
* This include file contains all information about a context.
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* 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 __RTEMS_CONTEXT_h
#define __RTEMS_CONTEXT_h
#ifdef __cplusplus
extern "C" {
#endif
#include <rtems/score/cpu.h>
/*
* The following constant defines the number of bytes required
* to store a full floating point context.
*/
#define CONTEXT_FP_SIZE CPU_CONTEXT_FP_SIZE
/*
* The following variable is set to TRUE when a reschedule operation
* has determined that the processor should be taken away from the
* currently executing thread and given to the heir thread.
*/
SCORE_EXTERN volatile boolean _Context_Switch_necessary;
/*
* _Context_Initialize
*
* DESCRIPTION:
*
* This routine initializes THE_CONTEXT such that the stack
* pointer, interrupt level, and entry point are correct for the
* thread's initial state.
*/
#define \
_Context_Initialize( _the_context, _stack, _size, _isr, _entry, _is_fp ) \
_CPU_Context_Initialize( _the_context, _stack, _size, _isr, _entry, _is_fp )
/*
* _Context_Switch
*
* DESCRIPTION:
*
* This routine saves the current context into the EXECUTING
* context record and restores the context specified by HEIR.
*/
#define _Context_Switch( _executing, _heir ) \
_CPU_Context_switch( _executing, _heir )
/*
* _Context_Restart_self
*
* DESCRIPTION:
*
* This routine restarts the calling thread by restoring its initial
* stack pointer and returning to the thread's entry point.
*/
#define _Context_Restart_self( _the_context ) \
_CPU_Context_Restart_self( _the_context )
/*
* _Context_Fp_start
*
* DESCRIPTION:
*
* This function returns the starting address of the floating
* point context save area. It is assumed that the are reserved
* for the floating point save area is large enough.
*/
#define _Context_Fp_start( _base, _offset ) \
_CPU_Context_Fp_start( (_base), (_offset) )
/*
* _Context_Initialize_fp
*
* DESCRIPTION:
*
* This routine initializes the floating point context save
* area to contain an initial known state.
*/
#define _Context_Initialize_fp( _fp_area ) \
_CPU_Context_Initialize_fp( _fp_area )
/*
* _Context_Restore_fp
*
* DESCRIPTION:
*
* This routine restores the floating point context contained
* in the FP_CONTEXT area. It is assumed that the current
* floating point context has been saved by a previous invocation
* of SAVE_FP.
*/
#define _Context_Restore_fp( _fp ) \
_CPU_Context_restore_fp( _fp )
/*
* _Context_Save_fp
*
* DESCRIPTION:
*
* This routine saves the current floating point context
* in the FP_CONTEXT area.
*/
#define _Context_Save_fp( _fp ) \
_CPU_Context_save_fp( _fp )
#ifdef __cplusplus
}
#endif
#endif
/* end of include file */
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