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79 lines
3.2 KiB
79 lines
3.2 KiB
# =========================================================================== |
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# http://www.gnu.org/software/autoconf-archive/ax_gcc_x86_cpuid.html |
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# =========================================================================== |
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# |
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# SYNOPSIS |
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# |
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# AX_GCC_X86_CPUID(OP) |
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# |
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# DESCRIPTION |
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# |
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# On Pentium and later x86 processors, with gcc or a compiler that has a |
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# compatible syntax for inline assembly instructions, run a small program |
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# that executes the cpuid instruction with input OP. This can be used to |
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# detect the CPU type. |
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# |
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# On output, the values of the eax, ebx, ecx, and edx registers are stored |
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# as hexadecimal strings as "eax:ebx:ecx:edx" in the cache variable |
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# ax_cv_gcc_x86_cpuid_OP. |
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# |
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# If the cpuid instruction fails (because you are running a |
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# cross-compiler, or because you are not using gcc, or because you are on |
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# a processor that doesn't have this instruction), ax_cv_gcc_x86_cpuid_OP |
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# is set to the string "unknown". |
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# |
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# This macro mainly exists to be used in AX_GCC_ARCHFLAG. |
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# |
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# LICENSE |
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# |
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# Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu> |
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# Copyright (c) 2008 Matteo Frigo |
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# |
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# This program is free software: you can redistribute it and/or modify it |
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# under the terms of the GNU General Public License as published by the |
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# Free Software Foundation, either version 3 of the License, or (at your |
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# option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, but |
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# WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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# Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License along |
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# with this program. If not, see <http://www.gnu.org/licenses/>. |
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# |
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# As a special exception, the respective Autoconf Macro's copyright owner |
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# gives unlimited permission to copy, distribute and modify the configure |
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# scripts that are the output of Autoconf when processing the Macro. You |
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# need not follow the terms of the GNU General Public License when using |
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# or distributing such scripts, even though portions of the text of the |
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# Macro appear in them. The GNU General Public License (GPL) does govern |
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# all other use of the material that constitutes the Autoconf Macro. |
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# |
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# This special exception to the GPL applies to versions of the Autoconf |
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# Macro released by the Autoconf Archive. When you make and distribute a |
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# modified version of the Autoconf Macro, you may extend this special |
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# exception to the GPL to apply to your modified version as well. |
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#serial 7 |
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AC_DEFUN([AX_GCC_X86_CPUID], |
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[AC_REQUIRE([AC_PROG_CC]) |
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AC_LANG_PUSH([C]) |
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AC_CACHE_CHECK(for x86 cpuid $1 output, ax_cv_gcc_x86_cpuid_$1, |
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[AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [ |
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int op = $1, eax, ebx, ecx, edx; |
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FILE *f; |
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__asm__("cpuid" |
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: "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) |
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: "a" (op)); |
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f = fopen("conftest_cpuid", "w"); if (!f) return 1; |
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fprintf(f, "%x:%x:%x:%x\n", eax, ebx, ecx, edx); |
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fclose(f); |
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return 0; |
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])], |
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[ax_cv_gcc_x86_cpuid_$1=`cat conftest_cpuid`; rm -f conftest_cpuid], |
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[ax_cv_gcc_x86_cpuid_$1=unknown; rm -f conftest_cpuid], |
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[ax_cv_gcc_x86_cpuid_$1=unknown])]) |
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AC_LANG_POP([C]) |
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])
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