1 /* Copyright (c) 2010 Xiph.Org Foundation 2 * Copyright (c) 2013 Parrot */ 3 /* 4 Redistribution and use in source and binary forms, with or without 5 modification, are permitted provided that the following conditions 6 are met: 7 8 - Redistributions of source code must retain the above copyright 9 notice, this list of conditions and the following disclaimer. 10 11 - Redistributions in binary form must reproduce the above copyright 12 notice, this list of conditions and the following disclaimer in the 13 documentation and/or other materials provided with the 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 FOR 18 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 19 OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 20 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 22 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 23 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 24 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 25 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 /* Original code from libtheora modified to suit to Opus */ 29 30 #ifdef HAVE_CONFIG_H 31 #include "config.h" 32 #endif 33 34 #ifdef OPUS_HAVE_RTCD 35 36 #include "armcpu.h" 37 #include "cpu_support.h" 38 #include "os_support.h" 39 #include "opus_types.h" 40 #include "arch.h" 41 42 #define OPUS_CPU_ARM_V4_FLAG (1<<OPUS_ARCH_ARM_V4) 43 #define OPUS_CPU_ARM_EDSP_FLAG (1<<OPUS_ARCH_ARM_EDSP) 44 #define OPUS_CPU_ARM_MEDIA_FLAG (1<<OPUS_ARCH_ARM_MEDIA) 45 #define OPUS_CPU_ARM_NEON_FLAG (1<<OPUS_ARCH_ARM_NEON) 46 47 #if defined(_MSC_VER) 48 /*For GetExceptionCode() and EXCEPTION_ILLEGAL_INSTRUCTION.*/ 49 # define WIN32_LEAN_AND_MEAN 50 # define WIN32_EXTRA_LEAN 51 # include <windows.h> 52 53 static OPUS_INLINE opus_uint32 opus_cpu_capabilities(void){ 54 opus_uint32 flags; 55 flags=0; 56 /* MSVC has no OPUS_INLINE __asm support for ARM, but it does let you __emit 57 * instructions via their assembled hex code. 58 * All of these instructions should be essentially nops. */ 59 # if defined(OPUS_ARM_MAY_HAVE_EDSP) || defined(OPUS_ARM_MAY_HAVE_MEDIA) \ 60 || defined(OPUS_ARM_MAY_HAVE_NEON) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR) 61 __try{ 62 /*PLD [r13]*/ 63 __emit(0xF5DDF000); 64 flags|=OPUS_CPU_ARM_EDSP_FLAG; 65 } 66 __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){ 67 /*Ignore exception.*/ 68 } 69 # if defined(OPUS_ARM_MAY_HAVE_MEDIA) \ 70 || defined(OPUS_ARM_MAY_HAVE_NEON) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR) 71 __try{ 72 /*SHADD8 r3,r3,r3*/ 73 __emit(0xE6333F93); 74 flags|=OPUS_CPU_ARM_MEDIA_FLAG; 75 } 76 __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){ 77 /*Ignore exception.*/ 78 } 79 # if defined(OPUS_ARM_MAY_HAVE_NEON) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR) 80 __try{ 81 /*VORR q0,q0,q0*/ 82 __emit(0xF2200150); 83 flags|=OPUS_CPU_ARM_NEON_FLAG; 84 } 85 __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){ 86 /*Ignore exception.*/ 87 } 88 # endif 89 # endif 90 # endif 91 return flags; 92 } 93 94 #elif defined(__linux__) 95 /* Linux based */ 96 opus_uint32 opus_cpu_capabilities(void) 97 { 98 opus_uint32 flags = 0; 99 FILE *cpuinfo; 100 101 /* Reading /proc/self/auxv would be easier, but that doesn't work reliably on 102 * Android */ 103 cpuinfo = fopen("/proc/cpuinfo", "r"); 104 105 if(cpuinfo != NULL) 106 { 107 /* 512 should be enough for anybody (it's even enough for all the flags that 108 * x86 has accumulated... so far). */ 109 char buf[512]; 110 111 while(fgets(buf, 512, cpuinfo) != NULL) 112 { 113 # if defined(OPUS_ARM_MAY_HAVE_EDSP) || defined(OPUS_ARM_MAY_HAVE_MEDIA) \ 114 || defined(OPUS_ARM_MAY_HAVE_NEON) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR) 115 /* Search for edsp and neon flag */ 116 if(memcmp(buf, "Features", 8) == 0) 117 { 118 char *p; 119 p = strstr(buf, " edsp"); 120 if(p != NULL && (p[5] == ' ' || p[5] == '\n')) 121 flags |= OPUS_CPU_ARM_EDSP_FLAG; 122 123 # if defined(OPUS_ARM_MAY_HAVE_NEON) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR) 124 p = strstr(buf, " neon"); 125 if(p != NULL && (p[5] == ' ' || p[5] == '\n')) 126 flags |= OPUS_CPU_ARM_NEON_FLAG; 127 # endif 128 } 129 # endif 130 131 # if defined(OPUS_ARM_MAY_HAVE_MEDIA) \ 132 || defined(OPUS_ARM_MAY_HAVE_NEON) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR) 133 /* Search for media capabilities (>= ARMv6) */ 134 if(memcmp(buf, "CPU architecture:", 17) == 0) 135 { 136 int version; 137 version = atoi(buf+17); 138 139 if(version >= 6) 140 flags |= OPUS_CPU_ARM_MEDIA_FLAG; 141 } 142 # endif 143 } 144 145 fclose(cpuinfo); 146 } 147 return flags; 148 } 149 #else 150 /* The feature registers which can tell us what the processor supports are 151 * accessible in priveleged modes only, so we can't have a general user-space 152 * detection method like on x86.*/ 153 # error "Configured to use ARM asm but no CPU detection method available for " \ 154 "your platform. Reconfigure with --disable-rtcd (or send patches)." 155 #endif 156 157 int opus_select_arch(void) 158 { 159 opus_uint32 flags = opus_cpu_capabilities(); 160 int arch = 0; 161 162 if(!(flags & OPUS_CPU_ARM_EDSP_FLAG)) { 163 /* Asserts ensure arch values are sequential */ 164 celt_assert(arch == OPUS_ARCH_ARM_V4); 165 return arch; 166 } 167 arch++; 168 169 if(!(flags & OPUS_CPU_ARM_MEDIA_FLAG)) { 170 celt_assert(arch == OPUS_ARCH_ARM_EDSP); 171 return arch; 172 } 173 arch++; 174 175 if(!(flags & OPUS_CPU_ARM_NEON_FLAG)) { 176 celt_assert(arch == OPUS_ARCH_ARM_MEDIA); 177 return arch; 178 } 179 arch++; 180 181 celt_assert(arch == OPUS_ARCH_ARM_NEON); 182 return arch; 183 } 184 185 #endif 186
