1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28 #ifndef _ARM_MACHINE_CPU_FEATURES_H
29 #define _ARM_MACHINE_CPU_FEATURES_H
31 /* The purpose of this file is to define several macros corresponding
32 * to CPU features that may or may not be available at build time on
33 * on the target CPU.
34 *
35 * This is done to abstract us from the various ARM Architecture
36 * quirks and alphabet soup.
37 */
39 /* __ARM_ARCH__ is a number corresponding to the ARM revision
40 * we're going to support. Our toolchain doesn't define __ARM_ARCH__
41 * so try to guess it.
42 */
43 #ifndef __ARM_ARCH__
44 # if defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ || \
45 defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
46 # define __ARM_ARCH__ 7
47 # elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ || \
48 defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6Z__ || \
49 defined __ARM_ARCH_6KZ__ || defined __ARM_ARCH_6T2__
50 # define __ARM_ARCH__ 6
51 # else
52 # error Unknown or unsupported ARM architecture
53 # endif
54 #endif
56 /* define __ARM_HAVE_HALFWORD_MULTIPLY when half-word multiply instructions
57 * this means variants of: smul, smulw, smla, smlaw, smlal
58 */
59 #define __ARM_HAVE_HALFWORD_MULTIPLY 1
61 /* define _ARM_HAVE_VFP if we have VFPv3
62 */
63 #if __ARM_ARCH__ >= 7 && defined __VFP_FP__
64 # define __ARM_HAVE_VFP
65 #endif
67 /* define _ARM_HAVE_NEON for ARMv7 architecture if we support the
68 * Neon SIMD instruction set extensions. This also implies
69 * that VFPv3-D32 is supported.
70 */
71 #if __ARM_ARCH__ >= 7 && defined __ARM_NEON__
72 # define __ARM_HAVE_NEON
73 #endif
75 #endif /* _ARM_MACHINE_CPU_FEATURES_H */