diff options
Diffstat (limited to 'sysdeps/x86_64/multiarch/init-arch.h')
-rw-r--r-- | sysdeps/x86_64/multiarch/init-arch.h | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/init-arch.h b/sysdeps/x86_64/multiarch/init-arch.h new file mode 100644 index 0000000000..86cd83dc4c --- /dev/null +++ b/sysdeps/x86_64/multiarch/init-arch.h @@ -0,0 +1,70 @@ +/* This file is part of the GNU C Library. + Copyright (C) 2008 Free Software Foundation, Inc. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sys/param.h> + +enum + { + INTEL_CPUID_INDEX_1 = 0, + /* Keep the following line at the end. */ + INTEL_CPUID_INDEX_MAX + }; + +enum + { + AMD_CPUID_INDEX_1 = 0, + /* Keep the following line at the end. */ + AMD_CPUID_INDEX_MAX + }; + +extern struct cpu_features +{ + enum + { + arch_kind_unknown = 0, + arch_kind_intel, + arch_kind_amd, + arch_kind_other + } kind; + int max_cpuid; + struct + { + unsigned int eax; + unsigned int ebx; + unsigned int ecx; + unsigned int edx; + } cpuid[MAX (INTEL_CPUID_INDEX_MAX, AMD_CPUID_INDEX_MAX)]; +} __cpu_features attribute_hidden; + + +extern void __init_cpu_features (void) attribute_hidden; +#define INIT_ARCH()\ + do \ + if (__cpu_features.kind == arch_kind_unknown) \ + __init_cpu_features (); \ + while (0) + +/* Following are the feature tests used throughout libc. */ + +#define INTEL_HAS_POPCOUNT \ + (__cpu_features.kind == arch_kind_intel \ + && (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].ecx & (1 << 23)) != 0) + +#define AMD_HAS_POPCOUNT \ + (__cpu_features.kind == arch_kind_amd \ + && (__cpu_features.cpuid[AMD_CPUID_INDEX_1].ecx & (1 << 23)) != 0) |