diff --git a/libc/arch-arm/include/machine/cpu-features.h b/libc/arch-arm/include/machine/cpu-features.h
new file mode 100644
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--- /dev/null
+++ b/libc/arch-arm/include/machine/cpu-features.h
@@ -0,0 +1,164 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#ifndef _ARM_MACHINE_CPU_FEATURES_H
+#define _ARM_MACHINE_CPU_FEATURES_H
+
+/* The purpose of this file is to define several macros corresponding
+ * to CPU features that may or may not be available at build time on
+ * on the target CPU.
+ *
+ * This is done to abstract us from the various ARM Architecture
+ * quirks and alphabet soup.
+ *
+ * IMPORTANT: We have no intention to support anything below an ARMv4T !
+ */
+
+/* _ARM_ARCH_REVISION is a number corresponding to the ARM revision
+ * we're going to support
+ *
+ * it looks like our toolchain doesn't define __ARM_ARCH__
+ * so try to guess it.
+ *
+ *
+ *
+ */
+#ifndef __ARM_ARCH__
+
+#  if defined __ARM_ARCH_7__   || defined __ARM_ARCH_7A__ || \
+      defined __ARM_ARCH_7R__  || defined __ARM_ARCH_7M__
+
+#    define __ARM_ARCH__ 7
+
+#  elif defined __ARM_ARCH_6__   || defined __ARM_ARCH_6J__ || \
+      defined __ARM_ARCH_6K__  || defined __ARM_ARCH_6Z__ || \
+      defined __ARM_ARCH_6KZ__ || defined __ARM_ARCH_6T2__
+#
+#    define __ARM_ARCH__ 6
+#
+#  elif defined __ARM_ARCH_5__ || defined __ARM_ARCH_5T__ || \
+        defined __ARM_ARCH_5TE__ || defined __ARM_ARCH_5TEJ__
+#
+#    define __ARM_ARCH__ 5
+#
+#  elif defined __ARM_ARCH_4T__
+#
+#    define __ARM_ARCH__ 4
+#
+#  elif defined __ARM_ARCH_4__
+#    error ARMv4 is not supported, please use ARMv4T at a minimum
+#  else
+#    error Unknown or unsupported ARM architecture
+#  endif
+#endif
+
+/* experimental feature used to check that our ARMv4 workarounds
+ * work correctly without a real ARMv4 machine */
+#ifdef BIONIC_EXPERIMENTAL_FORCE_ARMV4
+#  undef  __ARM_ARCH__
+#  define __ARM_ARCH__  4
+#endif
+
+/* define __ARM_HAVE_5TE if we have the ARMv5TE instructions */
+#if __ARM_ARCH__ > 5
+#  define  __ARM_HAVE_5TE  1
+#elif __ARM_ARCH__ == 5
+#  if defined __ARM_ARCH_5TE__ || defined __ARM_ARCH_5TEJ__
+#    define __ARM_HAVE_5TE  1
+#  endif
+#endif
+
+/* instructions introduced in ARMv5 */
+#if __ARM_ARCH__ >= 5
+#  define  __ARM_HAVE_BLX  1
+#  define  __ARM_HAVE_CLZ  1
+#  define  __ARM_HAVE_LDC2 1
+#  define  __ARM_HAVE_MCR2 1
+#  define  __ARM_HAVE_MRC2 1
+#  define  __ARM_HAVE_STC2 1
+#endif
+
+/* ARMv5TE introduces a few instructions */
+#if __ARM_HAVE_5TE
+#  define  __ARM_HAVE_PLD   1
+#  define  __ARM_HAVE_MCRR  1
+#  define  __ARM_HAVE_MRRC  1
+#endif
+
+/* define __ARM_HAVE_HALFWORD_MULTIPLY when half-word multiply instructions
+ * this means variants of: smul, smulw, smla, smlaw, smlal
+ */
+#if __ARM_HAVE_5TE
+#  define  __ARM_HAVE_HALFWORD_MULTIPLY  1
+#endif
+
+/* define __ARM_HAVE_PAIR_LOAD_STORE when 64-bit memory loads and stored
+ * into/from a pair of 32-bit registers is supported throuhg 'ldrd' and 'strd'
+ */
+#if __ARM_HAVE_5TE
+#  define  __ARM_HAVE_PAIR_LOAD_STORE 1
+#endif
+
+/* define __ARM_HAVE_SATURATED_ARITHMETIC is you have the saturated integer
+ * arithmetic instructions: qdd, qdadd, qsub, qdsub
+ */
+#if __ARM_HAVE_5TE
+#  define  __ARM_HAVE_SATURATED_ARITHMETIC 1
+#endif
+
+/* define __ARM_HAVE_PC_INTERWORK when a direct assignment to the
+ * pc register will switch into thumb/ARM mode depending on bit 0
+ * of the new instruction address. Before ARMv5, this was not the
+ * case, and you have to write:
+ *
+ *     mov  r0, [<some address>]
+ *     bx   r0
+ *
+ * instead of:
+ *
+ *     ldr  pc, [<some address>]
+ *
+ * note that this affects any instruction that explicitely changes the
+ * value of the pc register, including ldm { ...,pc } or 'add pc, #offset'
+ */
+#if __ARM_ARCH__ >= 5
+#  define __ARM_HAVE_PC_INTERWORK
+#endif
+
+
+/* Assembly-only macros */
+
+/* define a handy PLD(address) macro since the cache preload
+ * is an optional opcode
+ */
+#if __ARM_HAVE_PLD
+#  define  PLD(reg,offset)    pld    [reg, offset]
+#else
+#  define  PLD(reg,offset)    /* nothing */
+#endif
+
+#endif /* _ARM_MACHINE_CPU_FEATURES_H */