diff options
Diffstat (limited to 'sysdeps/x86_64/multiarch')
| -rw-r--r-- | sysdeps/x86_64/multiarch/Makefile | 3 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/init-arch.c | 65 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/init-arch.h | 70 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/sched_cpucount.c | 42 |
4 files changed, 180 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/Makefile b/sysdeps/x86_64/multiarch/Makefile new file mode 100644 index 0000000000..2a1e910e06 --- /dev/null +++ b/sysdeps/x86_64/multiarch/Makefile @@ -0,0 +1,3 @@ +ifeq ($(subdir),csu) +aux += init-arch +endif diff --git a/sysdeps/x86_64/multiarch/init-arch.c b/sysdeps/x86_64/multiarch/init-arch.c new file mode 100644 index 0000000000..eb4365fe32 --- /dev/null +++ b/sysdeps/x86_64/multiarch/init-arch.c @@ -0,0 +1,65 @@ +/* Initialize CPU feature data. + This file is part of the GNU C Library. + Copyright (C) 2008 Free Software Foundation, Inc. + Contributed by Ulrich Drepper <drepper@redhat.com>. + + 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 "init-arch.h" + + +struct cpu_features __cpu_features attribute_hidden; + + +void +__init_cpu_features (void) +{ + unsigned int ebx; + unsigned int ecx; + unsigned int edx; + + asm volatile ("cpuid" + : "=a" (__cpu_features.max_cpuid), "=b" (ebx), "=c" (ecx), + "=d" (edx) + : "0" (0)); + + /* This spells out "GenuineIntel". */ + if (ebx == 0x756e6547 && ecx == 0x6c65746e && edx == 0x49656e69) + { + __cpu_features.kind = arch_kind_intel; + + asm volatile ("cpuid" + : "=a" (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].eax), + "=b" (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].ebx), + "=c" (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].ecx), + "=d" (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].edx) + : "0" (1)); + } + /* This spells out "AuthenticAMD". */ + else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65) + { + __cpu_features.kind = arch_kind_amd; + + asm volatile ("cpuid" + : "=a" (__cpu_features.cpuid[AMD_CPUID_INDEX_1].eax), + "=b" (__cpu_features.cpuid[AMD_CPUID_INDEX_1].ebx), + "=c" (__cpu_features.cpuid[AMD_CPUID_INDEX_1].ecx), + "=d" (__cpu_features.cpuid[AMD_CPUID_INDEX_1].edx) + : "0" (1)); + } + else + __cpu_features.kind = arch_kind_other; +} 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) diff --git a/sysdeps/x86_64/multiarch/sched_cpucount.c b/sysdeps/x86_64/multiarch/sched_cpucount.c new file mode 100644 index 0000000000..dc20182df4 --- /dev/null +++ b/sysdeps/x86_64/multiarch/sched_cpucount.c @@ -0,0 +1,42 @@ +/* Count bits in CPU set. x86-64 multi-arch version. + This file is part of the GNU C Library. + Copyright (C) 2008 Free Software Foundation, Inc. + Contributed by Ulrich Drepper <drepper@redhat.com>. + + 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. */ + +#ifdef SHARED +# include <sched.h> +# include "init-arch.h" + +# define __sched_cpucount static generic_cpucount +# include <posix/sched_cpucount.c> +# undef __sched_cpucount + +# define POPCNT(l) \ + ({ __cpu_mask r; \ + asm ("popcntq %1, %0" : "=r" (r) : "0" (l));\ + r; }) +# define __sched_cpucount static popcount_cpucount +# include <posix/sched_cpucount.c> +# undef __sched_cpucount + +libc_ifunc (__sched_cpucount, + INTEL_HAS_POPCOUNT || AMD_HAS_POPCOUNT + ? popcount_cpucount : generic_cpucount); +#else +# include_next <sched_cpucount.c> +#endif |