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/* cache.h
*
* Cache Manager
*
* 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.
*
*
* The functions in this file define the API to the RTEMS Cache Manager and
* are divided into data cache and instruction cache functions. Data cache
* functions are only declared if a data cache is supported. Instruction
* cache functions are only declared if an instruction cache is supported.
* Support for a particular cache exists only if _CPU_x_CACHE_ALIGNMENT is
* defined, where x E {DATA, INST}. These definitions are found in the CPU
* dependent source files in the supercore, often
*
* rtems/c/src/exec/score/cpu/CPU/rtems/score/CPU.h
*
* The functions below are implemented with CPU dependent inline routines
* also found in the above file. In the event that a CPU does not support a
* specific function, the CPU dependent routine does nothing (but does exist).
*
* At this point, the Cache Manager makes no considerations, and provides no
* support for BSP specific issues such as a secondary cache. In such a system,
* the CPU dependent routines would have to be modified, or a BSP layer added
* to this Manager.
*/
#ifndef __CACHE_h
#define __CACHE_h
#ifdef __cplusplus
extern "C" {
#endif
#include <rtems/system.h>
#include <sys/types.h>
/* THESE FUNCTIONS ONLY EXIST IF WE HAVE A DATA CACHE */
#if defined(_CPU_DATA_CACHE_ALIGNMENT)
/*
* This function is called to flush the data cache by performing cache
* copybacks. It must determine how many cache lines need to be copied
* back and then perform the copybacks.
*/
void rtems_flush_multiple_data_cache_lines( const void *, size_t );
/*
* This function is responsible for performing a data cache invalidate.
* It must determine how many cache lines need to be invalidated and then
* perform the invalidations.
*/
void rtems_invalidate_multiple_data_cache_lines( const void *, size_t );
/*
* This function is responsible for performing a data cache flush.
* It flushes the entire cache.
*/
void rtems_flush_entire_data_cache( void );
/*
* This function is responsible for performing a data cache
* invalidate. It invalidates the entire cache.
*/
void rtems_invalidate_entire_data_cache( void );
/*
* This function returns the data cache granularity.
*/
int rtems_get_data_cache_line_size( void );
/*
* This function freezes the data cache.
*/
void rtems_freeze_data_cache( void );
/*
* This function unfreezes the data cache.
*/
void rtems_unfreeze_data_cache( void );
/*
* These functions enable/disable the data cache.
*/
void rtems_enable_data_cache( void );
void rtems_disable_data_cache( void );
#endif
/* THESE FUNCTIONS ONLY EXIST IF WE HAVE AN INSTRUCTION CACHE */
#if defined(_CPU_INST_CACHE_ALIGNMENT)
/*
* This function is responsible for performing an instruction cache
* invalidate. It must determine how many cache lines need to be invalidated
* and then perform the invalidations.
*/
void rtems_invalidate_multiple_inst_cache_lines( const void *, size_t );
/*
* This function is responsible for performing an instruction cache
* invalidate. It invalidates the entire cache.
*/
void rtems_invalidate_entire_inst_cache( void );
/*
* This function returns the instruction cache granularity.
*/
int rtems_get_inst_cache_line_size( void );
/*
* This function freezes the instruction cache.
*/
void rtems_freeze_inst_cache( void );
/*
* This function unfreezes the instruction cache.
*/
void rtems_unfreeze_inst_cache( void );
/*
* These functions enable/disable the instruction cache.
*/
void rtems_enable_inst_cache( void );
void rtems_disable_inst_cache( void );
#endif
#ifdef __cplusplus
}
#endif
#endif
/* end of include file */
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