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/**
* @file
*
* @brief CPU Port Implementation API
*/
/*
* Copyright (c) 2013, 2016 embedded brains GmbH
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifndef _RTEMS_SCORE_CPUIMPL_H
#define _RTEMS_SCORE_CPUIMPL_H
#include <rtems/score/cpu.h>
/**
* @brief The size of the CPU specific per-CPU control.
*
* This define must be visible to assember files since it is used to derive
* structure offsets.
*/
#define CPU_PER_CPU_CONTROL_SIZE 0
#ifndef ASM
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief The CPU specific per-CPU control.
*
* The CPU port can place here all state information that must be available and
* maintained for each processor in the system. This structure must contain at
* least one field for C/C++ compatibility. In GNU C empty structures have a
* size of zero. In C++ structures have a non-zero size. In case
* CPU_PER_CPU_CONTROL_SIZE is defined to zero, then this structure is not
* used.
*/
typedef struct {
/* CPU specific per-CPU state */
} CPU_Per_CPU_control;
/**
* @brief Special register pointing to the per-CPU control of the current
* processor.
*
* This is optional. Not every CPU port needs this. It is only an optional
* optimization variant.
*/
register struct Per_CPU_Control *_CPU_Per_CPU_current asm( "rX" );
/**
* @brief Optional method to obtain the per-CPU control of the current processor.
*
* This is optional. Not every CPU port needs this. It is only an optional
* optimization variant. In case this macro is undefined, the default
* implementation using the current processor index will be used.
*/
#define _CPU_Get_current_per_CPU_control() ( _CPU_Per_CPU_current )
/**
* @brief Optional method to get the executing thread.
*
* This is optional. Not every CPU port needs this. It is only an optional
* optimization variant. In case this macro is undefined, the default
* implementation uses the per-CPU information and the current processor index
* to get the executing thread.
*/
#define _CPU_Get_thread_executing() ( _CPU_Per_CPU_current->executing )
#ifdef __cplusplus
}
#endif
#endif /* ASM */
#endif /* _RTEMS_SCORE_CPUIMPL_H */
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