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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cache_size.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CACHE_SIZE
#
# DESCRIPTION
#
# Find L1 and L2 caches size by reading the corresponding file on UNIX or
# by requesting cpuid. The results are available in the defines
# CPU_L1_CACHE and CPU_L2_CACHE.
#
# This macro depends on AX_GCC_X86_CPUID, AC_PROG_SED, AX_COUNT_CPUS, and
# AX_CPU_VENDOR.
#
# LICENSE
#
# Copyright (c) 2008 Christophe Tournayre <turn3r@users.sourceforge.net>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 8
AC_DEFUN([AX_CACHE_SIZE],
[
AC_REQUIRE([AC_PROG_SED])
AC_REQUIRE([AX_COUNT_CPUS])
AC_REQUIRE([AX_GCC_X86_CPUID])
AC_REQUIRE([AX_CPU_VENDOR])
AX_COUNT_CPUS
AX_CPU_VENDOR
ax_l1_size=unknown
ax_l2_size=unknown
#Check if the variable is present
if test -e /sys/devices/system/cpu/cpu0/cache/index0/size; then
for ncpu in `seq 0 $(($CPU_COUNT-1))`; do
for idx in `seq 0 3`; do
if test -e /sys/devices/system/cpu/cpu$ncpu/cache/index$idx/size ; then
level=`cat /sys/devices/system/cpu/cpu$ncpu/cache/index$idx/level`
size=`cat /sys/devices/system/cpu/cpu$ncpu/cache/index$idx/size`
eval CPU$ncpu\_L$level\_CACHE="$size"
fi
done
done
# This part can (must !!!) be optimized, because we know all caches per proc but
# we only take care about the first proc
ax_l1_size=$CPU0_L1_CACHE
ax_l2_size=$CPU0_L2_CACHE
else
#Or use CPUID
if test $ax_xpu_vendor != "Intel"; then
AX_GCC_X86_CPUID(0x80000005) # For L1 cache (not available on intel !!!)
l1_hexval=$(( 16#`echo $ax_cv_gcc_x86_cpuid_0x80000005 | cut -d ":" -f 4`))
ax_l1_size=$(($l1_hexval >> 24))
fi
AX_GCC_X86_CPUID(0x80000006) # For L2 cache
l2_hexval=$(( 16#`echo $ax_cv_gcc_x86_cpuid_0x80000006 | cut -d ":" -f 3`))
ax_l2_size=$(($l2_hexval >> 16))
fi
# Keep only digits if there is a unit (ie 1024K -> 1024) and convert in Bytes
AC_MSG_CHECKING(the L1 cache size)
ax_l1_size=`echo $ax_l1_size | $SED 's/\([[0-9]]\)[[A-Za-z]]$/\1/g'`
ax_l1_size=$(($ax_l1_size*1024))
AC_MSG_RESULT( $ax_l1_size Bytes)
AC_MSG_CHECKING(the L2 cache size)
ax_l2_size=`echo $ax_l2_size | $SED 's/\([[0-9]]\)[[A-Za-z]]$/\1/g'`
ax_l2_size=$(($ax_l2_size*1024))
AC_MSG_RESULT( $ax_l2_size Bytes)
AC_DEFINE_UNQUOTED([CPU_L1_CACHE], ${ax_l1_size}, [L1 cache size (in Bytes)])
AC_DEFINE_UNQUOTED([CPU_L2_CACHE], ${ax_l2_size}, [L2 cache size (in Bytes)])
])
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