diff --git a/csu/libc-start.c b/csu/libc-start.c
index 9a56dcb..ec19466 100644
--- a/csu/libc-start.c
+++ b/csu/libc-start.c
@@ -182,6 +182,10 @@ LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
 
   __tunables_init (__environ);
 
+#ifdef INIT_CPU_FEATURES
+  INIT_CPU_FEATURES;
+#endif
+
   /* Perform IREL{,A} relocations.  */
   apply_irel ();
 
diff --git a/elf/dl-sysdep.c b/elf/dl-sysdep.c
index 4053ff3..c963a1e 100644
--- a/elf/dl-sysdep.c
+++ b/elf/dl-sysdep.c
@@ -223,6 +223,10 @@ _dl_sysdep_start (void **start_argptr,
 
   __tunables_init (_environ);
 
+#ifdef INIT_CPU_FEATURES
+  INIT_CPU_FEATURES;
+#endif
+
 #ifdef DL_SYSDEP_INIT
   DL_SYSDEP_INIT;
 #endif
diff --git a/sysdeps/aarch64/dl-procinfo.h b/sysdeps/aarch64/dl-procinfo.h
index e69de29..0e0829f 100644
--- a/sysdeps/aarch64/dl-procinfo.h
+++ b/sysdeps/aarch64/dl-procinfo.h
@@ -0,0 +1,50 @@
+/* Stub version of processor capability information handling macros.
+   Copyright (C) 1998-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
+
+   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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _DL_PROCINFO_H
+#define _DL_PROCINFO_H	1
+
+/* We cannot provide a general printing function.  */
+#define _dl_procinfo(type, word) -1
+
+/* There are no hardware capabilities defined.  */
+#define _dl_hwcap_string(idx) ""
+
+/* There are no different platforms defined.  */
+#define _dl_platform_string(idx) ""
+
+/* Needed here until this gets into kernel sources.  */
+#ifndef HWCAP_CPUID
+# define HWCAP_CPUID            (1 << 11)
+#endif
+
+/* By default there is no important hardware capability.  */
+#define HWCAP_IMPORTANT (HWCAP_CPUID)
+
+/* There're no platforms to filter out.  */
+#define _DL_HWCAP_PLATFORM 0
+
+/* We don't have any hardware capabilities.  */
+#define _DL_HWCAP_COUNT 0
+
+#define _dl_string_hwcap(str) (-1)
+
+#define _dl_string_platform(str) (-1)
+
+#endif /* dl-procinfo.h */
diff --git a/sysdeps/aarch64/ldsodefs.h b/sysdeps/aarch64/ldsodefs.h
index f277074..ba4ada3 100644
--- a/sysdeps/aarch64/ldsodefs.h
+++ b/sysdeps/aarch64/ldsodefs.h
@@ -20,6 +20,7 @@
 #define _AARCH64_LDSODEFS_H 1
 
 #include <elf.h>
+#include <cpu-features.h>
 
 struct La_aarch64_regs;
 struct La_aarch64_retval;
diff --git a/sysdeps/unix/sysv/linux/aarch64/Makefile b/sysdeps/unix/sysv/linux/aarch64/Makefile
index 6b4e620..d17dafe 100644
--- a/sysdeps/unix/sysv/linux/aarch64/Makefile
+++ b/sysdeps/unix/sysv/linux/aarch64/Makefile
@@ -1,5 +1,6 @@
 ifeq ($(subdir),csu)
 sysdep_routines      += __read_tp libc-__read_tp
+sysdep_routines      += cpu-features
 static-only-routines += __read_tp
 shared-only-routines += libc-__read_tp
 endif
diff --git a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
index e69de29..867e1ca 100644
--- a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
+++ b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
@@ -0,0 +1,45 @@
+/* Initialize CPU feature data.  AArch64 version.
+   This file is part of the GNU C Library.
+   Copyright (C) 2017 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <cpu-features.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <ldsodefs.h>
+#include <exit-thread.h>
+#include <libc-internal.h>
+
+#ifndef HWCAP_CPUID
+# define HWCAP_CPUID		(1 << 11)
+#endif
+
+void
+init_cpu_features (struct cpu_features *cpu_features)
+{
+  if (HWCAP_CPUID & GLRO(dl_hwcap) & GLRO(dl_hwcap_mask))
+    {
+      register uint64_t id = 0;
+      asm volatile ("mrs %0, midr_el1" : "=r"(id));
+      cpu_features->midr_el1 = id;
+    }
+  else
+    {
+      cpu_features->midr_el1 = 0;
+    }
+}
diff --git a/sysdeps/unix/sysv/linux/aarch64/cpu-features.h b/sysdeps/unix/sysv/linux/aarch64/cpu-features.h
index e69de29..0b2a51b 100644
--- a/sysdeps/unix/sysv/linux/aarch64/cpu-features.h
+++ b/sysdeps/unix/sysv/linux/aarch64/cpu-features.h
@@ -0,0 +1,53 @@
+/* Initialize CPU feature data.  AArch64 version.
+   This file is part of the GNU C Library.
+   Copyright (C) 2017 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _CPU_FEATURES_AARCH64_H
+#define _CPU_FEATURES_AARCH64_H
+
+#include <stdint.h>
+
+#define MIDR_PARTNUM_SHIFT	4
+#define MIDR_PARTNUM_MASK	(0xfff << MIDR_PARTNUM_SHIFT)
+#define MIDR_PARTNUM(midr)	\
+	(((midr) & MIDR_PARTNUM_MASK) >> MIDR_PARTNUM_SHIFT)
+#define MIDR_ARCHITECTURE_SHIFT	16
+#define MIDR_ARCHITECTURE_MASK	(0xf << MIDR_ARCHITECTURE_SHIFT)
+#define MIDR_ARCHITECTURE(midr)	\
+	(((midr) & MIDR_ARCHITECTURE_MASK) >> MIDR_ARCHITECTURE_SHIFT)
+#define MIDR_VARIANT_SHIFT	20
+#define MIDR_VARIANT_MASK	(0xf << MIDR_VARIANT_SHIFT)
+#define MIDR_VARIANT(midr)	\
+	(((midr) & MIDR_VARIANT_MASK) >> MIDR_VARIANT_SHIFT)
+#define MIDR_IMPLEMENTOR_SHIFT	24
+#define MIDR_IMPLEMENTOR_MASK	(0xff << MIDR_IMPLEMENTOR_SHIFT)
+#define MIDR_IMPLEMENTOR(midr)	\
+	(((midr) & MIDR_IMPLEMENTOR_MASK) >> MIDR_IMPLEMENTOR_SHIFT)
+
+#define IS_THUNDERX(midr) (MIDR_IMPLEMENTOR(midr) == 'C'	\
+			   && MIDR_PARTNUM(midr) == 0x0a1)
+
+struct cpu_features
+{
+  uint64_t midr_el1;
+};
+
+void init_cpu_features (struct cpu_features *cpu_features);
+
+#define INIT_CPU_FEATURES init_cpu_features(&GLRO(dl_aarch64_cpu_features))
+
+#endif /* _CPU_FEATURES_AARCH64_H  */
diff --git a/sysdeps/unix/sysv/linux/aarch64/dl-procinfo.c b/sysdeps/unix/sysv/linux/aarch64/dl-procinfo.c
index e69de29..438046a 100644
--- a/sysdeps/unix/sysv/linux/aarch64/dl-procinfo.c
+++ b/sysdeps/unix/sysv/linux/aarch64/dl-procinfo.c
@@ -0,0 +1,60 @@
+/* Data for AArch64 version of processor capability information.
+   Linux version.
+   Copyright (C) 2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* If anything should be added here check whether the size of each string
+   is still ok with the given array size.
+
+   All the #ifdefs in the definitions are quite irritating but
+   necessary if we want to avoid duplicating the information.  There
+   are three different modes:
+
+   - PROCINFO_DECL is defined.  This means we are only interested in
+     declarations.
+
+   - PROCINFO_DECL is not defined:
+
+     + if SHARED is defined the file is included in an array
+       initializer.  The .element = { ... } syntax is needed.
+
+     + if SHARED is not defined a normal array initialization is
+       needed.
+  */
+
+#ifndef PROCINFO_CLASS
+# define PROCINFO_CLASS
+#endif
+
+#if !IS_IN (ldconfig)
+# if !defined PROCINFO_DECL && defined SHARED
+  ._dl_aarch64_cpu_features
+# else
+PROCINFO_CLASS struct cpu_features _dl_aarch64_cpu_features
+# endif
+# ifndef PROCINFO_DECL
+= { }
+# endif
+# if !defined SHARED || defined PROCINFO_DECL
+;
+# else
+,
+# endif
+#endif
+
+#undef PROCINFO_DECL
+#undef PROCINFO_CLASS
