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/*@@
@file Cache.c
@date Tue Nov 30 08:07:12 1999
@author Tom Goodale
@desc
Routines dealing with cache alignment.
@enddesc
@version $Id$
@@*/
#include <stdlib.h>
#include "cctk_Cache.h"
#include "cctki_Cache.h"
#include "cctk_Flesh.h"
static const char *rcsid = "$Header$";
CCTK_FILEVERSION(util_Cache_c);
/********************************************************************
********************* Local Data *****************************
********************************************************************/
/* Structure to hold cache information. */
static struct s_cache_data
{
unsigned long cacheline_bytes;
unsigned long cache_size;
} cache_data;
/* The number of times the size of the cache has been set. */
static int cache_set = 0;
/********************************************************************
********************* External Routines **********************
********************************************************************/
/*@@
@routine Util_CacheMalloc
@date Tue Nov 30 08:13:03 1999
@author Tom Goodale
@desc
Allocates memory aligned on the 'index'ed cache line.
@enddesc
@var idx
@vdesc cache line index
@vtype unsigned int
@vio in
@vcomment
The cache line to align on
@endvar
@var size
@vdesc the amount of memory to allocate
@vtype unsigned long
@vio in
@vcomment
This is the size (in bytes) of memory to allocate.
@endvar
@var realstart
@vdesc The real starting address of the memory
@vtype void **
@vio out
@vcomment
On return holds the actual starting address of the memory.
@endvar
@returntype void *
@returndesc
The cache-aligned memory address.
@endreturndesc
@@*/
void *Util_CacheMalloc(unsigned int idx,
unsigned long size,
void **realstart)
{
char *retval;
char *data;
unsigned long cacheline_bytes;
unsigned long cache_size;
unsigned long offset;
unsigned long initial_index;
unsigned long pad;
if(Utili_CacheDataGet(&cacheline_bytes, &cache_size))
{
cacheline_bytes = cache_size = 0;
}
retval = NULL;
data = malloc((size_t)(size+cache_size));
if(data)
{
pad = 0;
if(cache_size && cacheline_bytes)
{
/* Find how far this memory is into a cache line */
offset = ((unsigned long)data%cache_size)%cacheline_bytes;
/* Find which cache line in the cache it is in */
initial_index = ((unsigned long)data%cache_size)/cacheline_bytes;
pad = ((idx-initial_index)*cacheline_bytes + cacheline_bytes - offset)%cache_size;
}
retval = data + pad;
}
*realstart = (void *)data;
return (void *)retval;
}
/********************************************************************
********************* CCTK Local Routines **********************
********************************************************************/
/*@@
@routine Utili_CacheDataSet
@date Tue Nov 30 08:12:05 1999
@author Tom Goodale
@desc
Stores the sizes of the cache.
@enddesc
@var cacheline_bytes
@vdesc The size of a cacheline
@vtype unsigned long
@vio in
@vcomment
Number of bytes in a cache line.
@endvar
@var cache_size
@vdesc Size of the cache
@vtype unsigned long
@vio in
@vcomment
The size (in bytes) of the cache.
@endvar
@returntype int
@returndesc
The number of times this function has been called before.
@endreturndesc
@@*/
int Utili_CacheDataSet(unsigned long cacheline_bytes,
unsigned long cache_size)
{
cache_data.cacheline_bytes = cacheline_bytes;
cache_data.cache_size = cache_size;
cache_set++;
return cache_set-1;
}
/*@@
@routine Utili_CacheDataGet
@date Tue Nov 30 08:12:41 1999
@author Tom Goodale
@desc
Gets the sizes of the cache.
@enddesc
@var cacheline_bytes
@vdesc The size of a cacheline
@vtype unsigned long *
@vio out
@vcomment
Number of bytes in a cache line.
@endvar
@var cache_size
@vdesc Size of the cache
@vtype unsigned long *
@vio out
@vcomment
The size (in bytes) of the cache.
@endvar
@returntype int
@returndesc
0 - success
-1 - cache sizes have not been set yet.
@endreturndesc
@@*/
int Utili_CacheDataGet(unsigned long *cacheline_bytes,
unsigned long *cache_size)
{
if(cache_set)
{
*cacheline_bytes = cache_data.cacheline_bytes;
*cache_size = cache_data.cache_size;
}
return (cache_set ? 0 : -1);
}
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