1/*
2 * Copyright © 2000 SuSE, Inc.
3 * Copyright © 2007 Red Hat, Inc.
4 *
5 * Permission to use, copy, modify, distribute, and sell this software and its
6 * documentation for any purpose is hereby granted without fee, provided that
7 * the above copyright notice appear in all copies and that both that
8 * copyright notice and this permission notice appear in supporting
9 * documentation, and that the name of SuSE not be used in advertising or
10 * publicity pertaining to distribution of the software without specific,
11 * written prior permission.  SuSE makes no representations about the
12 * suitability of this software for any purpose.  It is provided "as is"
13 * without express or implied warranty.
14 *
15 * SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
17 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
18 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
19 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
20 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21 */
22#ifdef HAVE_CONFIG_H
23#include <config.h>
24#endif
25
26#include "pixman-private.h"
27
28typedef enum
29{
30    ARM_V7		= (1 << 0),
31    ARM_V6		= (1 << 1),
32    ARM_VFP		= (1 << 2),
33    ARM_NEON		= (1 << 3),
34    ARM_IWMMXT		= (1 << 4)
35} arm_cpu_features_t;
36
37#if defined(USE_ARM_SIMD) || defined(USE_ARM_NEON) || defined(USE_ARM_IWMMXT)
38
39#if defined(_MSC_VER)
40
41/* Needed for EXCEPTION_ILLEGAL_INSTRUCTION */
42#include <windows.h>
43
44extern int pixman_msvc_try_arm_neon_op ();
45extern int pixman_msvc_try_arm_simd_op ();
46
47static arm_cpu_features_t
48detect_cpu_features (void)
49{
50    arm_cpu_features_t features = 0;
51
52    __try
53    {
54	pixman_msvc_try_arm_simd_op ();
55	features |= ARM_V6;
56    }
57    __except (GetExceptionCode () == EXCEPTION_ILLEGAL_INSTRUCTION)
58    {
59    }
60
61    __try
62    {
63	pixman_msvc_try_arm_neon_op ();
64	features |= ARM_NEON;
65    }
66    __except (GetExceptionCode () == EXCEPTION_ILLEGAL_INSTRUCTION)
67    {
68    }
69
70    return features;
71}
72
73#elif defined(__APPLE__) && defined(TARGET_OS_IPHONE) /* iOS */
74
75#include "TargetConditionals.h"
76
77static arm_cpu_features_t
78detect_cpu_features (void)
79{
80    arm_cpu_features_t features = 0;
81
82    features |= ARM_V6;
83
84    /* Detection of ARM NEON on iOS is fairly simple because iOS binaries
85     * contain separate executable images for each processor architecture.
86     * So all we have to do is detect the armv7 architecture build. The
87     * operating system automatically runs the armv7 binary for armv7 devices
88     * and the armv6 binary for armv6 devices.
89     */
90#if defined(__ARM_NEON__)
91    features |= ARM_NEON;
92#endif
93
94    return features;
95}
96
97#elif defined(__ANDROID__) || defined(ANDROID) /* Android */
98
99#include <cpu-features.h>
100
101static arm_cpu_features_t
102detect_cpu_features (void)
103{
104    arm_cpu_features_t features = 0;
105    AndroidCpuFamily cpu_family;
106    uint64_t cpu_features;
107
108    cpu_family = android_getCpuFamily();
109    cpu_features = android_getCpuFeatures();
110
111    if (cpu_family == ANDROID_CPU_FAMILY_ARM)
112    {
113	if (cpu_features & ANDROID_CPU_ARM_FEATURE_ARMv7)
114	    features |= ARM_V7;
115
116	if (cpu_features & ANDROID_CPU_ARM_FEATURE_VFPv3)
117	    features |= ARM_VFP;
118
119	if (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON)
120	    features |= ARM_NEON;
121    }
122
123    return features;
124}
125
126#elif defined (__linux__) /* linux ELF */
127
128#include <unistd.h>
129#include <sys/types.h>
130#include <sys/stat.h>
131#include <sys/mman.h>
132#include <fcntl.h>
133#include <string.h>
134#include <elf.h>
135
136static arm_cpu_features_t
137detect_cpu_features (void)
138{
139    arm_cpu_features_t features = 0;
140    Elf32_auxv_t aux;
141    int fd;
142
143    fd = open ("/proc/self/auxv", O_RDONLY);
144    if (fd >= 0)
145    {
146	while (read (fd, &aux, sizeof(Elf32_auxv_t)) == sizeof(Elf32_auxv_t))
147	{
148	    if (aux.a_type == AT_HWCAP)
149	    {
150		uint32_t hwcap = aux.a_un.a_val;
151
152		/* hardcode these values to avoid depending on specific
153		 * versions of the hwcap header, e.g. HWCAP_NEON
154		 */
155		if ((hwcap & 64) != 0)
156		    features |= ARM_VFP;
157		if ((hwcap & 512) != 0)
158		    features |= ARM_IWMMXT;
159		/* this flag is only present on kernel 2.6.29 */
160		if ((hwcap & 4096) != 0)
161		    features |= ARM_NEON;
162	    }
163	    else if (aux.a_type == AT_PLATFORM)
164	    {
165		const char *plat = (const char*) aux.a_un.a_val;
166
167		if (strncmp (plat, "v7l", 3) == 0)
168		    features |= (ARM_V7 | ARM_V6);
169		else if (strncmp (plat, "v6l", 3) == 0)
170		    features |= ARM_V6;
171	    }
172	}
173	close (fd);
174    }
175
176    return features;
177}
178
179#else /* Unknown */
180
181static arm_cpu_features_t
182detect_cpu_features (void)
183{
184    return 0;
185}
186
187#endif /* Linux elf */
188
189static pixman_bool_t
190have_feature (arm_cpu_features_t feature)
191{
192    static pixman_bool_t initialized;
193    static arm_cpu_features_t features;
194
195    if (!initialized)
196    {
197	features = detect_cpu_features();
198	initialized = TRUE;
199    }
200
201    return (features & feature) == feature;
202}
203
204#endif /* USE_ARM_SIMD || USE_ARM_NEON || USE_ARM_IWMMXT */
205
206pixman_implementation_t *
207_pixman_arm_get_implementations (pixman_implementation_t *imp)
208{
209#ifdef USE_ARM_SIMD
210    if (!_pixman_disabled ("arm-simd") && have_feature (ARM_V6))
211	imp = _pixman_implementation_create_arm_simd (imp);
212#endif
213
214#ifdef USE_ARM_IWMMXT
215    if (!_pixman_disabled ("arm-iwmmxt") && have_feature (ARM_IWMMXT))
216	imp = _pixman_implementation_create_mmx (imp);
217#endif
218
219#ifdef USE_ARM_NEON
220    if (!_pixman_disabled ("arm-neon") && have_feature (ARM_NEON))
221	imp = _pixman_implementation_create_arm_neon (imp);
222#endif
223
224    return imp;
225}
226