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
41 #define OPUS_CPU_ARM_V4 (1)
42 #define OPUS_CPU_ARM_EDSP (1<<1)
43 #define OPUS_CPU_ARM_MEDIA (1<<2)
44 #define OPUS_CPU_ARM_NEON (1<<3)
45
46 #if defined(_MSC_VER)
47 /*For GetExceptionCode() and EXCEPTION_ILLEGAL_INSTRUCTION.*/
48 # define WIN32_LEAN_AND_MEAN
49 # define WIN32_EXTRA_LEAN
50 # include <windows.h>
51
opus_cpu_capabilities(void)52 static OPUS_INLINE opus_uint32 opus_cpu_capabilities(void){
53 opus_uint32 flags;
54 flags=0;
55 /* MSVC has no OPUS_INLINE __asm support for ARM, but it does let you __emit
56 * instructions via their assembled hex code.
57 * All of these instructions should be essentially nops. */
58 # if defined(OPUS_ARM_MAY_HAVE_EDSP)
59 __try{
60 /*PLD [r13]*/
61 __emit(0xF5DDF000);
62 flags|=OPUS_CPU_ARM_EDSP;
63 }
64 __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){
65 /*Ignore exception.*/
66 }
67 # if defined(OPUS_ARM_MAY_HAVE_MEDIA)
68 __try{
69 /*SHADD8 r3,r3,r3*/
70 __emit(0xE6333F93);
71 flags|=OPUS_CPU_ARM_MEDIA;
72 }
73 __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){
74 /*Ignore exception.*/
75 }
76 # if defined(OPUS_ARM_MAY_HAVE_NEON)
77 __try{
78 /*VORR q0,q0,q0*/
79 __emit(0xF2200150);
80 flags|=OPUS_CPU_ARM_NEON;
81 }
82 __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){
83 /*Ignore exception.*/
84 }
85 # endif
86 # endif
87 # endif
88 return flags;
89 }
90
91 #elif defined(__linux__)
92 /* Linux based */
opus_cpu_capabilities(void)93 opus_uint32 opus_cpu_capabilities(void)
94 {
95 opus_uint32 flags = 0;
96 FILE *cpuinfo;
97
98 /* Reading /proc/self/auxv would be easier, but that doesn't work reliably on
99 * Android */
100 cpuinfo = fopen("/proc/cpuinfo", "r");
101
102 if(cpuinfo != NULL)
103 {
104 /* 512 should be enough for anybody (it's even enough for all the flags that
105 * x86 has accumulated... so far). */
106 char buf[512];
107
108 while(fgets(buf, 512, cpuinfo) != NULL)
109 {
110 # if defined(OPUS_ARM_MAY_HAVE_EDSP) || defined(OPUS_ARM_MAY_HAVE_NEON)
111 /* Search for edsp and neon flag */
112 if(memcmp(buf, "Features", 8) == 0)
113 {
114 char *p;
115 # if defined(OPUS_ARM_MAY_HAVE_EDSP)
116 p = strstr(buf, " edsp");
117 if(p != NULL && (p[5] == ' ' || p[5] == '\n'))
118 flags |= OPUS_CPU_ARM_EDSP;
119 # endif
120
121 # if defined(OPUS_ARM_MAY_HAVE_NEON)
122 p = strstr(buf, " neon");
123 if(p != NULL && (p[5] == ' ' || p[5] == '\n'))
124 flags |= OPUS_CPU_ARM_NEON;
125 # endif
126 }
127 # endif
128
129 # if defined(OPUS_ARM_MAY_HAVE_MEDIA)
130 /* Search for media capabilities (>= ARMv6) */
131 if(memcmp(buf, "CPU architecture:", 17) == 0)
132 {
133 int version;
134 version = atoi(buf+17);
135
136 if(version >= 6)
137 flags |= OPUS_CPU_ARM_MEDIA;
138 }
139 # endif
140 }
141
142 fclose(cpuinfo);
143 }
144 return flags;
145 }
146 #else
147 /* The feature registers which can tell us what the processor supports are
148 * accessible in priveleged modes only, so we can't have a general user-space
149 * detection method like on x86.*/
150 # error "Configured to use ARM asm but no CPU detection method available for " \
151 "your platform. Reconfigure with --disable-rtcd (or send patches)."
152 #endif
153
opus_select_arch(void)154 int opus_select_arch(void)
155 {
156 opus_uint32 flags = opus_cpu_capabilities();
157 int arch = 0;
158
159 if(!(flags & OPUS_CPU_ARM_EDSP))
160 return arch;
161 arch++;
162
163 if(!(flags & OPUS_CPU_ARM_MEDIA))
164 return arch;
165 arch++;
166
167 if(!(flags & OPUS_CPU_ARM_NEON))
168 return arch;
169 arch++;
170
171 return arch;
172 }
173
174 #endif
175