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 * IMPORTANT: We have no intention to support anything below an ARMv4T ! 39 */ 40 41 /* __ARM_ARCH__ is a number corresponding to the ARM revision 42 * we're going to support 43 * 44 * it looks like our toolchain doesn't define __ARM_ARCH__ 45 * so try to guess it. 46 * 47 * 48 * 49 */ 50 #ifndef __ARM_ARCH__ 51 52 # if defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ || \ 53 defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__ 54 55 # define __ARM_ARCH__ 7 56 57 # elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ || \ 58 defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6Z__ || \ 59 defined __ARM_ARCH_6KZ__ || defined __ARM_ARCH_6T2__ 60 # 61 # define __ARM_ARCH__ 6 62 # 63 # elif defined __ARM_ARCH_5__ || defined __ARM_ARCH_5T__ || \ 64 defined __ARM_ARCH_5TE__ || defined __ARM_ARCH_5TEJ__ 65 # 66 # define __ARM_ARCH__ 5 67 # 68 # elif defined __ARM_ARCH_4T__ 69 # 70 # define __ARM_ARCH__ 4 71 # 72 # elif defined __ARM_ARCH_4__ 73 # error ARMv4 is not supported, please use ARMv4T at a minimum 74 # else 75 # error Unknown or unsupported ARM architecture 76 # endif 77 #endif 78 79 /* experimental feature used to check that our ARMv4 workarounds 80 * work correctly without a real ARMv4 machine */ 81 #ifdef BIONIC_EXPERIMENTAL_FORCE_ARMV4 82 # undef __ARM_ARCH__ 83 # define __ARM_ARCH__ 4 84 #endif 85 86 /* define __ARM_HAVE_5TE if we have the ARMv5TE instructions */ 87 #if __ARM_ARCH__ > 5 88 # define __ARM_HAVE_5TE 1 89 #elif __ARM_ARCH__ == 5 90 # if defined __ARM_ARCH_5TE__ || defined __ARM_ARCH_5TEJ__ 91 # define __ARM_HAVE_5TE 1 92 # endif 93 #endif 94 95 /* instructions introduced in ARMv5 */ 96 #if __ARM_ARCH__ >= 5 97 # define __ARM_HAVE_BLX 1 98 # define __ARM_HAVE_CLZ 1 99 # define __ARM_HAVE_LDC2 1 100 # define __ARM_HAVE_MCR2 1 101 # define __ARM_HAVE_MRC2 1 102 # define __ARM_HAVE_STC2 1 103 #endif 104 105 /* ARMv5TE introduces a few instructions */ 106 #if __ARM_HAVE_5TE 107 # define __ARM_HAVE_PLD 1 108 # define __ARM_HAVE_MCRR 1 109 # define __ARM_HAVE_MRRC 1 110 #endif 111 112 /* define __ARM_HAVE_HALFWORD_MULTIPLY when half-word multiply instructions 113 * this means variants of: smul, smulw, smla, smlaw, smlal 114 */ 115 #if __ARM_HAVE_5TE 116 # define __ARM_HAVE_HALFWORD_MULTIPLY 1 117 #endif 118 119 /* define __ARM_HAVE_PAIR_LOAD_STORE when 64-bit memory loads and stored 120 * into/from a pair of 32-bit registers is supported throuhg 'ldrd' and 'strd' 121 */ 122 #if __ARM_HAVE_5TE 123 # define __ARM_HAVE_PAIR_LOAD_STORE 1 124 #endif 125 126 /* define __ARM_HAVE_SATURATED_ARITHMETIC is you have the saturated integer 127 * arithmetic instructions: qdd, qdadd, qsub, qdsub 128 */ 129 #if __ARM_HAVE_5TE 130 # define __ARM_HAVE_SATURATED_ARITHMETIC 1 131 #endif 132 133 /* define __ARM_HAVE_PC_INTERWORK when a direct assignment to the 134 * pc register will switch into thumb/ARM mode depending on bit 0 135 * of the new instruction address. Before ARMv5, this was not the 136 * case, and you have to write: 137 * 138 * mov r0, [<some address>] 139 * bx r0 140 * 141 * instead of: 142 * 143 * ldr pc, [<some address>] 144 * 145 * note that this affects any instruction that explicitly changes the 146 * value of the pc register, including ldm { ...,pc } or 'add pc, #offset' 147 */ 148 #if __ARM_ARCH__ >= 5 149 # define __ARM_HAVE_PC_INTERWORK 150 #endif 151 152 /* define __ARM_HAVE_LDREX_STREX for ARMv6 and ARMv7 architecture to be 153 * used in replacement of deprecated swp instruction 154 */ 155 #if __ARM_ARCH__ >= 6 156 # define __ARM_HAVE_LDREX_STREX 157 #endif 158 159 /* define __ARM_HAVE_DMB for ARMv7 architecture 160 */ 161 #if __ARM_ARCH__ >= 7 162 # define __ARM_HAVE_DMB 163 #endif 164 165 /* define __ARM_HAVE_LDREXD for ARMv7 architecture 166 * (also present in ARMv6K, but not implemented in ARMv7-M, neither of which 167 * we care about) 168 */ 169 #if __ARM_ARCH__ >= 7 170 # define __ARM_HAVE_LDREXD 171 #endif 172 173 /* define _ARM_HAVE_VFP if we have VFPv3 174 */ 175 #if __ARM_ARCH__ >= 7 && defined __VFP_FP__ 176 # define __ARM_HAVE_VFP 177 #endif 178 179 /* define _ARM_HAVE_NEON for ARMv7 architecture if we support the 180 * Neon SIMD instruction set extensions. This also implies 181 * that VFPv3-D32 is supported. 182 */ 183 #if __ARM_ARCH__ >= 7 && defined __ARM_NEON__ 184 # define __ARM_HAVE_NEON 185 #endif 186 187 /* Assembly-only macros */ 188 #ifdef __ASSEMBLY__ 189 190 /* define a handy PLD(address) macro since the cache preload 191 * is an optional opcode 192 */ 193 #if __ARM_HAVE_PLD 194 # define PLD(reg,offset) pld [reg, offset] 195 #else 196 # define PLD(reg,offset) /* nothing */ 197 #endif 198 199 #endif /* ! __ASSEMBLY__ */ 200 201 #endif /* _ARM_MACHINE_CPU_FEATURES_H */ 202
