1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
/*
* Copyright © 2000 SuSE, Inc.
* Copyright © 2007 Red Hat, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of SuSE not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. SuSE makes no representations about the
* suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
* BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "pixman-private.h"
typedef enum
{
ARM_V7 = (1 << 0),
ARM_V6 = (1 << 1),
ARM_VFP = (1 << 2),
ARM_NEON = (1 << 3),
ARM_IWMMXT = (1 << 4)
} arm_cpu_features_t;
#if defined(USE_ARM_SIMD) || defined(USE_ARM_NEON) || defined(USE_ARM_IWMMXT)
#if defined(_MSC_VER)
/* Needed for EXCEPTION_ILLEGAL_INSTRUCTION */
#include <windows.h>
extern int pixman_msvc_try_arm_neon_op ();
extern int pixman_msvc_try_arm_simd_op ();
static arm_cpu_features_t
detect_cpu_features (void)
{
arm_cpu_features_t features = 0;
__try
{
pixman_msvc_try_arm_simd_op ();
features |= ARM_V6;
}
__except (GetExceptionCode () == EXCEPTION_ILLEGAL_INSTRUCTION)
{
}
__try
{
pixman_msvc_try_arm_neon_op ();
features |= ARM_NEON;
}
__except (GetExceptionCode () == EXCEPTION_ILLEGAL_INSTRUCTION)
{
}
return features;
}
#elif defined(__APPLE__) && defined(TARGET_OS_IPHONE) /* iOS */
#include "TargetConditionals.h"
static arm_cpu_features_t
detect_cpu_features (void)
{
arm_cpu_features_t features = 0;
features |= ARM_V6;
/* Detection of ARM NEON on iOS is fairly simple because iOS binaries
* contain separate executable images for each processor architecture.
* So all we have to do is detect the armv7 architecture build. The
* operating system automatically runs the armv7 binary for armv7 devices
* and the armv6 binary for armv6 devices.
*/
#if defined(__ARM_NEON__)
features |= ARM_NEON;
#endif
return features;
}
#elif defined(__ANDROID__) || defined(ANDROID) /* Android */
static arm_cpu_features_t
detect_cpu_features (void)
{
arm_cpu_features_t features = 0;
char buf[1024];
char* pos;
const char* ver_token = "CPU architecture: ";
FILE* f = fopen("/proc/cpuinfo", "r");
if (!f) {
return features;
}
fread(buf, sizeof(char), sizeof(buf), f);
fclose(f);
pos = strstr(buf, ver_token);
if (pos) {
char vchar = *(pos + strlen(ver_token));
if (vchar >= '0' && vchar <= '9') {
int ver = vchar - '0';
if (ver >= 7)
features |= ARM_V7;
}
}
if (strstr(buf, "neon") != NULL)
features |= ARM_NEON;
if (strstr(buf, "vfp") != NULL)
features |= ARM_VFP;
return features;
}
#elif defined (__linux__) /* linux ELF */
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <string.h>
#include <elf.h>
static arm_cpu_features_t
detect_cpu_features (void)
{
arm_cpu_features_t features = 0;
Elf32_auxv_t aux;
int fd;
fd = open ("/proc/self/auxv", O_RDONLY);
if (fd >= 0)
{
while (read (fd, &aux, sizeof(Elf32_auxv_t)) == sizeof(Elf32_auxv_t))
{
if (aux.a_type == AT_HWCAP)
{
uint32_t hwcap = aux.a_un.a_val;
/* hardcode these values to avoid depending on specific
* versions of the hwcap header, e.g. HWCAP_NEON
*/
if ((hwcap & 64) != 0)
features |= ARM_VFP;
if ((hwcap & 512) != 0)
features |= ARM_IWMMXT;
/* this flag is only present on kernel 2.6.29 */
if ((hwcap & 4096) != 0)
features |= ARM_NEON;
}
else if (aux.a_type == AT_PLATFORM)
{
const char *plat = (const char*) aux.a_un.a_val;
if (strncmp (plat, "v7l", 3) == 0)
features |= (ARM_V7 | ARM_V6);
else if (strncmp (plat, "v6l", 3) == 0)
features |= ARM_V6;
}
}
close (fd);
}
return features;
}
#else /* Unknown */
static arm_cpu_features_t
detect_cpu_features (void)
{
return 0;
}
#endif /* Linux elf */
static pixman_bool_t
have_feature (arm_cpu_features_t feature)
{
static pixman_bool_t initialized;
static arm_cpu_features_t features;
if (!initialized)
{
features = detect_cpu_features();
initialized = TRUE;
}
return (features & feature) == feature;
}
#endif /* USE_ARM_SIMD || USE_ARM_NEON || USE_ARM_IWMMXT */
pixman_implementation_t *
_pixman_arm_get_implementations (pixman_implementation_t *imp)
{
#ifdef USE_ARM_SIMD
if (!_pixman_disabled ("arm-simd") && have_feature (ARM_V6))
imp = _pixman_implementation_create_arm_simd (imp);
#endif
#ifdef USE_ARM_IWMMXT
if (!_pixman_disabled ("arm-iwmmxt") && have_feature (ARM_IWMMXT))
imp = _pixman_implementation_create_mmx (imp);
#endif
#ifdef USE_ARM_NEON
if (!_pixman_disabled ("arm-neon") && have_feature (ARM_NEON))
imp = _pixman_implementation_create_arm_neon (imp);
#endif
return imp;
}
|
