cache.c

RTEMS (Real-Time Executive for Multiprocessor Systems) is a free open source real-time operating sys

/*
 *  Cache Management Support Routines for the MC68040
 * Modified for MPC8260 Andy Dachs <[e-mail]>
 * Surrey Satellite Technology Limited (SSTL), 2001
 *
 *  $Id: cache.c,v 1.4 2001/10/22 13:46:37 joel Exp $
 */

#include <rtems.h>
#include "cache_.h"


/*
 * CACHE MANAGER: The following functions are CPU-specific.
 * They provide the basic implementation for the rtems_* cache
 * management routines. If a given function has no meaning for the CPU,
 * it does nothing by default.
 * 
 * FIXME: Some functions simply have not been implemented.
 */
 
#if defined(ppc603) || defined(mpc8260)	   /* And possibly others */

/* Helpful macros */
#define PPC_Get_HID0( _value ) \
  do { \
      _value = 0;        /* to avoid warnings */ \
      asm volatile( \
          "mfspr %0, 0x3f0;"     /* get HID0 */ \
          "isync" \
          : "=r" (_value) \
          : "0" (_value) \
      ); \
  } while (0)

#define PPC_Set_HID0( _value ) \
  do { \
      asm volatile( \
          "isync;" \
          "mtspr 0x3f0, %0;"     /* load HID0 */ \
          "isync" \
          : "=r" (_value) \
          : "0" (_value) \
      ); \
  } while (0)

void _CPU_cache_enable_data (
	void )
{
  unsigned32 value;
  PPC_Get_HID0( value );
  value |= 0x00004000;        /* set DCE bit */
  PPC_Set_HID0( value );
}

void _CPU_cache_disable_data (
	void )
{
  unsigned32 value;
  PPC_Get_HID0( value );
  value &= 0xFFFFBFFF;        /* clear DCE bit */
  PPC_Set_HID0( value );
}

void _CPU_cache_enable_instruction (
	void )
{
  unsigned32 value;
  PPC_Get_HID0( value );
  value |= 0x00008000;       /* Set ICE bit */
  PPC_Set_HID0( value );
}

void _CPU_cache_disable_instruction (
	void )
{
  unsigned32 value;
  PPC_Get_HID0( value );
  value &= 0xFFFF7FFF;       /* Clear ICE bit */
  PPC_Set_HID0( value );
}

#elif ( defined(mpx8xx) || defined(mpc860) || defined(mpc821) )

#define mtspr(_spr,_reg) \
  __asm__ volatile ( "mtspr %0, %1\n" : : "i" ((_spr)), "r" ((_reg)) )
#define isync \
  __asm__ volatile ("isync\n"::)

void _CPU_cache_flush_1_data_line(
	const void * _address )
{
  register const void *__address = _address;
  asm volatile ( "dcbf 0,%0" :: "r" (__address) );
}

void _CPU_cache_invalidate_1_data_line(
	const void * _address )
{
  register const void *__address = _address;
  asm volatile ( "dcbi 0,%0" :: "r" (__address) );
}

void _CPU_cache_flush_entire_data ( void ) {}
void _CPU_cache_invalidate_entire_data ( void ) {}
void _CPU_cache_freeze_data ( void ) {}
void _CPU_cache_unfreeze_data ( void ) {}

void _CPU_cache_enable_data ( void )
{
  unsigned32 r1;
  r1 = (0x2<<24);
  mtspr( 568, r1 );
  isync;
}

void _CPU_cache_disable_data ( void )
{
  unsigned32 r1;
  r1 = (0x4<<24);
  mtspr( 568, r1 );
  isync;
}

void _CPU_cache_invalidate_1_instruction_line(
	const void * _address )
{
  register const void *__address = _address;
  asm volatile ( "icbi 0,%0" :: "r" (__address) );
}

void _CPU_cache_invalidate_entire_instruction ( void ) {}
void _CPU_cache_freeze_instruction ( void ) {}
void _CPU_cache_unfreeze_instruction ( void ) {}

void _CPU_cache_enable_instruction ( void )
{
  unsigned32 r1;
  r1 = (0x2<<24);
  mtspr( 560, r1 );
  isync;
}

void _CPU_cache_disable_instruction ( void )
{
  unsigned32 r1;
  r1 = (0x4<<24);
  mtspr( 560, r1 );
  isync;
}
#endif

/* end of file */