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6
7
8 package cpu
9
10 const CacheLinePadSize = 64
11
12
13 func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32)
14
15
16 func xgetbv() (eax, edx uint32)
17
18 const (
19
20 cpuid_SSE2 = 1 << 26
21
22
23 cpuid_SSE3 = 1 << 0
24 cpuid_PCLMULQDQ = 1 << 1
25 cpuid_SSSE3 = 1 << 9
26 cpuid_FMA = 1 << 12
27 cpuid_SSE41 = 1 << 19
28 cpuid_SSE42 = 1 << 20
29 cpuid_POPCNT = 1 << 23
30 cpuid_AES = 1 << 25
31 cpuid_OSXSAVE = 1 << 27
32 cpuid_AVX = 1 << 28
33
34
35 cpuid_BMI1 = 1 << 3
36 cpuid_AVX2 = 1 << 5
37 cpuid_BMI2 = 1 << 8
38 cpuid_ERMS = 1 << 9
39 cpuid_ADX = 1 << 19
40 )
41
42 var maxExtendedFunctionInformation uint32
43
44 func doinit() {
45 options = []option{
46 {Name: "adx", Feature: &X86.HasADX},
47 {Name: "aes", Feature: &X86.HasAES},
48 {Name: "avx", Feature: &X86.HasAVX},
49 {Name: "avx2", Feature: &X86.HasAVX2},
50 {Name: "bmi1", Feature: &X86.HasBMI1},
51 {Name: "bmi2", Feature: &X86.HasBMI2},
52 {Name: "erms", Feature: &X86.HasERMS},
53 {Name: "fma", Feature: &X86.HasFMA},
54 {Name: "pclmulqdq", Feature: &X86.HasPCLMULQDQ},
55 {Name: "popcnt", Feature: &X86.HasPOPCNT},
56 {Name: "sse3", Feature: &X86.HasSSE3},
57 {Name: "sse41", Feature: &X86.HasSSE41},
58 {Name: "sse42", Feature: &X86.HasSSE42},
59 {Name: "ssse3", Feature: &X86.HasSSSE3},
60
61
62 {Name: "sse2", Feature: &X86.HasSSE2, Required: GOARCH == "amd64"},
63 }
64
65 maxID, _, _, _ := cpuid(0, 0)
66
67 if maxID < 1 {
68 return
69 }
70
71 maxExtendedFunctionInformation, _, _, _ = cpuid(0x80000000, 0)
72
73 _, _, ecx1, edx1 := cpuid(1, 0)
74 X86.HasSSE2 = isSet(edx1, cpuid_SSE2)
75
76 X86.HasSSE3 = isSet(ecx1, cpuid_SSE3)
77 X86.HasPCLMULQDQ = isSet(ecx1, cpuid_PCLMULQDQ)
78 X86.HasSSSE3 = isSet(ecx1, cpuid_SSSE3)
79 X86.HasSSE41 = isSet(ecx1, cpuid_SSE41)
80 X86.HasSSE42 = isSet(ecx1, cpuid_SSE42)
81 X86.HasPOPCNT = isSet(ecx1, cpuid_POPCNT)
82 X86.HasAES = isSet(ecx1, cpuid_AES)
83
84
85
86
87 X86.HasOSXSAVE = isSet(ecx1, cpuid_OSXSAVE)
88
89
90
91
92
93 X86.HasFMA = isSet(ecx1, cpuid_FMA) && X86.HasOSXSAVE
94
95 osSupportsAVX := false
96
97 if X86.HasOSXSAVE {
98 eax, _ := xgetbv()
99
100 osSupportsAVX = isSet(eax, 1<<1) && isSet(eax, 1<<2)
101 }
102
103 X86.HasAVX = isSet(ecx1, cpuid_AVX) && osSupportsAVX
104
105 if maxID < 7 {
106 return
107 }
108
109 _, ebx7, _, _ := cpuid(7, 0)
110 X86.HasBMI1 = isSet(ebx7, cpuid_BMI1)
111 X86.HasAVX2 = isSet(ebx7, cpuid_AVX2) && osSupportsAVX
112 X86.HasBMI2 = isSet(ebx7, cpuid_BMI2)
113 X86.HasERMS = isSet(ebx7, cpuid_ERMS)
114 X86.HasADX = isSet(ebx7, cpuid_ADX)
115 }
116
117 func isSet(hwc uint32, value uint32) bool {
118 return hwc&value != 0
119 }
120
121
122
123
124 func Name() string {
125 if maxExtendedFunctionInformation < 0x80000004 {
126 return ""
127 }
128
129 data := make([]byte, 0, 3*4*4)
130
131 var eax, ebx, ecx, edx uint32
132 eax, ebx, ecx, edx = cpuid(0x80000002, 0)
133 data = appendBytes(data, eax, ebx, ecx, edx)
134 eax, ebx, ecx, edx = cpuid(0x80000003, 0)
135 data = appendBytes(data, eax, ebx, ecx, edx)
136 eax, ebx, ecx, edx = cpuid(0x80000004, 0)
137 data = appendBytes(data, eax, ebx, ecx, edx)
138
139
140 for len(data) > 0 && data[0] == ' ' {
141 data = data[1:]
142 }
143
144
145 for i, c := range data {
146 if c == '\x00' {
147 data = data[:i]
148 break
149 }
150 }
151
152 return string(data)
153 }
154
155 func appendBytes(b []byte, args ...uint32) []byte {
156 for _, arg := range args {
157 b = append(b,
158 byte((arg >> 0)),
159 byte((arg >> 8)),
160 byte((arg >> 16)),
161 byte((arg >> 24)))
162 }
163 return b
164 }
165
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