1 /*
2 * Copyright (c) 2013 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 *
23 * Authors:
24 * Chris Wilson <chris@chris-wilson.co.uk>
25 *
26 */
27
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #include "sna.h"
33 #include "sna_cpuid.h"
34
35 #define xgetbv(index,eax,edx) \
36 __asm__ ("xgetbv" : "=a"(eax), "=d"(edx) : "c" (index))
37
38 #define has_YMM 0x1
39
sna_cpu_detect(void)40 unsigned sna_cpu_detect(void)
41 {
42 unsigned max = __get_cpuid_max(BASIC_CPUID, NULL);
43 unsigned eax, ebx, ecx, edx;
44 unsigned features = 0;
45 unsigned extra = 0;
46
47 if (max >= 1) {
48 __cpuid(1, eax, ebx, ecx, edx);
49
50 if (ecx & bit_SSE3)
51 features |= SSE3;
52
53 if (ecx & bit_SSSE3)
54 features |= SSSE3;
55
56 if (ecx & bit_SSE4_1)
57 features |= SSE4_1;
58
59 if (ecx & bit_SSE4_2)
60 features |= SSE4_2;
61
62 if (ecx & bit_OSXSAVE) {
63 unsigned int bv_eax, bv_ecx;
64 xgetbv(0, bv_eax, bv_ecx);
65 if ((bv_eax & 6) == 6)
66 extra |= has_YMM;
67 }
68
69 if ((extra & has_YMM) && (ecx & bit_AVX))
70 features |= AVX;
71
72 if (edx & bit_MMX)
73 features |= MMX;
74
75 if (edx & bit_SSE)
76 features |= SSE;
77
78 if (edx & bit_SSE2)
79 features |= SSE2;
80 }
81
82 if (max >= 7) {
83 __cpuid_count(7, 0, eax, ebx, ecx, edx);
84
85 if ((extra & has_YMM) && (ebx & bit_AVX2))
86 features |= AVX2;
87 }
88
89 return features;
90 }
91
sna_cpu_features_to_string(unsigned features,char * line)92 char *sna_cpu_features_to_string(unsigned features, char *line)
93 {
94 char *ret = line;
95
96 #ifdef __x86_64__
97 line += sprintf (line, "x86-64");
98 #else
99 line += sprintf (line, "x86");
100 #endif
101
102 if (features & SSE2)
103 line += sprintf (line, ", sse2");
104 if (features & SSE3)
105 line += sprintf (line, ", sse3");
106 if (features & SSSE3)
107 line += sprintf (line, ", ssse3");
108 if (features & SSE4_1)
109 line += sprintf (line, ", sse4.1");
110 if (features & SSE4_2)
111 line += sprintf (line, ", sse4.2");
112 if (features & AVX)
113 line += sprintf (line, ", avx");
114 if (features & AVX2)
115 line += sprintf (line, ", avx2");
116
117 return ret;
118 }
119