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 30 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 */ 38 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 55 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 60 61 /* define __ARM_HAVE_LDREXD for ARMv7 architecture 62 * (also present in ARMv6K, but not implemented in ARMv7-M, neither of which 63 * we care about) 64 */ 65 #if __ARM_ARCH__ >= 7 66 # define __ARM_HAVE_LDREXD 67 #endif 68 69 /* define _ARM_HAVE_VFP if we have VFPv3 70 */ 71 #if __ARM_ARCH__ >= 7 && defined __VFP_FP__ 72 # define __ARM_HAVE_VFP 73 #endif 74 75 /* define _ARM_HAVE_NEON for ARMv7 architecture if we support the 76 * Neon SIMD instruction set extensions. This also implies 77 * that VFPv3-D32 is supported. 78 */ 79 #if __ARM_ARCH__ >= 7 && defined __ARM_NEON__ 80 # define __ARM_HAVE_NEON 81 #endif 82 83 #endif /* _ARM_MACHINE_CPU_FEATURES_H */ 84