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
opus_cpu_capabilities(void)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 */
opus_cpu_capabilities(void)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
opus_select_arch(void)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