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+ − 1 # ===========================================================================
+ − 2 # http://www.gnu.org/software/autoconf-archive/ax_gcc_x86_cpuid.html
+ − 3 # ===========================================================================
+ − 4 #
+ − 5 # SYNOPSIS
+ − 6 #
+ − 7 # AX_GCC_X86_CPUID(OP)
+ − 8 #
+ − 9 # DESCRIPTION
+ − 10 #
+ − 11 # On Pentium and later x86 processors, with gcc or a compiler that has a
+ − 12 # compatible syntax for inline assembly instructions, run a small program
+ − 13 # that executes the cpuid instruction with input OP. This can be used to
+ − 14 # detect the CPU type.
+ − 15 #
+ − 16 # On output, the values of the eax, ebx, ecx, and edx registers are stored
+ − 17 # as hexadecimal strings as "eax:ebx:ecx:edx" in the cache variable
+ − 18 # ax_cv_gcc_x86_cpuid_OP.
+ − 19 #
+ − 20 # If the cpuid instruction fails (because you are running a
+ − 21 # cross-compiler, or because you are not using gcc, or because you are on
+ − 22 # a processor that doesn't have this instruction), ax_cv_gcc_x86_cpuid_OP
+ − 23 # is set to the string "unknown".
+ − 24 #
+ − 25 # This macro mainly exists to be used in AX_GCC_ARCHFLAG.
+ − 26 #
+ − 27 # LICENSE
+ − 28 #
+ − 29 # Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
+ − 30 # Copyright (c) 2008 Matteo Frigo
+ − 31 #
+ − 32 # This program is free software: you can redistribute it and/or modify it
+ − 33 # under the terms of the GNU General Public License as published by the
+ − 34 # Free Software Foundation, either version 3 of the License, or (at your
+ − 35 # option) any later version.
+ − 36 #
+ − 37 # This program is distributed in the hope that it will be useful, but
+ − 38 # WITHOUT ANY WARRANTY; without even the implied warranty of
+ − 39 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+ − 40 # Public License for more details.
+ − 41 #
+ − 42 # You should have received a copy of the GNU General Public License along
+ − 43 # with this program. If not, see <http://www.gnu.org/licenses/>.
+ − 44 #
+ − 45 # As a special exception, the respective Autoconf Macro's copyright owner
+ − 46 # gives unlimited permission to copy, distribute and modify the configure
+ − 47 # scripts that are the output of Autoconf when processing the Macro. You
+ − 48 # need not follow the terms of the GNU General Public License when using
+ − 49 # or distributing such scripts, even though portions of the text of the
+ − 50 # Macro appear in them. The GNU General Public License (GPL) does govern
+ − 51 # all other use of the material that constitutes the Autoconf Macro.
+ − 52 #
+ − 53 # This special exception to the GPL applies to versions of the Autoconf
+ − 54 # Macro released by the Autoconf Archive. When you make and distribute a
+ − 55 # modified version of the Autoconf Macro, you may extend this special
+ − 56 # exception to the GPL to apply to your modified version as well.
+ − 57
+ − 58 #serial 7
+ − 59
+ − 60 AC_DEFUN([AX_GCC_X86_CPUID],
+ − 61 [AC_REQUIRE([AC_PROG_CC])
+ − 62 AC_LANG_PUSH([C])
+ − 63 AC_CACHE_CHECK(for x86 cpuid $1 output, ax_cv_gcc_x86_cpuid_$1,
+ − 64 [AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [
+ − 65 int op = $1, eax, ebx, ecx, edx;
+ − 66 FILE *f;
+ − 67 __asm__("cpuid"
+ − 68 : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx)
+ − 69 : "a" (op));
+ − 70 f = fopen("conftest_cpuid", "w"); if (!f) return 1;
+ − 71 fprintf(f, "%x:%x:%x:%x\n", eax, ebx, ecx, edx);
+ − 72 fclose(f);
+ − 73 return 0;
+ − 74 ])],
+ − 75 [ax_cv_gcc_x86_cpuid_$1=`cat conftest_cpuid`; rm -f conftest_cpuid],
+ − 76 [ax_cv_gcc_x86_cpuid_$1=unknown; rm -f conftest_cpuid],
+ − 77 [ax_cv_gcc_x86_cpuid_$1=unknown])])
+ − 78 AC_LANG_POP([C])
+ − 79 ])
