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/*
* libmowgli: A collection of useful routines for programming.
* cacheline.c: Platform specific routines to get L1 cache line size
*
* Copyright (c) 2013 Patrick McFarland <pmcfarland@adterrasperaspera.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "mowgli.h"
#ifdef MOWGLI_OS_OSX
# include <sys/sysctl.h>
#endif
size_t cacheline_size;
void
mowgli_cacheline_bootstrap(void)
{
#ifdef MOWGLI_OS_LINUX
cacheline_size = sysconf(_SC_LEVEL1_DCACHE_LINESIZE);
#elif defined(MOWGLI_OS_OSX)
size_t size = sizeof(size_t);
sysctlbyname("hw.cachelinesize", &cacheline_size, &size, 0, 0);
#elif defined(MOWGLI_OS_WIN)
DWORD buf_size = 0;
DWORD i = 0;
SYSTEM_LOGICAL_PROCESSOR_INFORMATION *buf = 0;
GetLogicalProcessorInformation(0, &buf_size);
buf = (SYSTEM_LOGICAL_PROCESSOR_INFORMATION *) mowgli_alloc(buf_size);
GetLogicalProcessorInformation(&buf[0], &buf_size);
for (i = 0; i != buf_size / sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION); ++i)
if ((buf[i].Relationship == RelationCache) && (buf[i].Cache.Level == 1))
{
cacheline_size = buf[i].Cache.LineSize;
break;
}
mowgli_free(buf);
#else
// This is often true
# ifdef MOWGLI_CPU_BITS_32
cacheline_size = 32;
# else
cacheline_size = 64;
# endif
#endif
}
size_t
mowgli_cacheline_size(void)
{
return cacheline_size;
}
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