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