aboutsummaryrefslogtreecommitdiffstats
path: root/vendor/github.com/klauspost/cpuid/v2/os_linux_arm64.go
diff options
context:
space:
mode:
authorLibravatar Rutger Broekhoff2024-01-02 18:56:31 +0100
committerLibravatar Rutger Broekhoff2024-01-02 18:56:31 +0100
commit8db41da676ac8368ef7c2549d56239a5ff5eedde (patch)
tree09c427fd66de2ec1ebffc8342f5fdbb84b0701b5 /vendor/github.com/klauspost/cpuid/v2/os_linux_arm64.go
parentd4f75fb6db22e57577867445a022227e70958931 (diff)
downloadgitolfs3-8db41da676ac8368ef7c2549d56239a5ff5eedde.tar.gz
gitolfs3-8db41da676ac8368ef7c2549d56239a5ff5eedde.zip
Delete vendor directory
Diffstat (limited to 'vendor/github.com/klauspost/cpuid/v2/os_linux_arm64.go')
-rw-r--r--vendor/github.com/klauspost/cpuid/v2/os_linux_arm64.go130
1 files changed, 0 insertions, 130 deletions
diff --git a/vendor/github.com/klauspost/cpuid/v2/os_linux_arm64.go b/vendor/github.com/klauspost/cpuid/v2/os_linux_arm64.go
deleted file mode 100644
index ee278b9..0000000
--- a/vendor/github.com/klauspost/cpuid/v2/os_linux_arm64.go
+++ /dev/null
@@ -1,130 +0,0 @@
1// Copyright (c) 2020 Klaus Post, released under MIT License. See LICENSE file.
2
3// Copyright 2018 The Go Authors. All rights reserved.
4// Use of this source code is governed by a BSD-style
5// license that can be found in the LICENSE file located
6// here https://github.com/golang/sys/blob/master/LICENSE
7
8package cpuid
9
10import (
11 "encoding/binary"
12 "io/ioutil"
13 "runtime"
14)
15
16// HWCAP bits.
17const (
18 hwcap_FP = 1 << 0
19 hwcap_ASIMD = 1 << 1
20 hwcap_EVTSTRM = 1 << 2
21 hwcap_AES = 1 << 3
22 hwcap_PMULL = 1 << 4
23 hwcap_SHA1 = 1 << 5
24 hwcap_SHA2 = 1 << 6
25 hwcap_CRC32 = 1 << 7
26 hwcap_ATOMICS = 1 << 8
27 hwcap_FPHP = 1 << 9
28 hwcap_ASIMDHP = 1 << 10
29 hwcap_CPUID = 1 << 11
30 hwcap_ASIMDRDM = 1 << 12
31 hwcap_JSCVT = 1 << 13
32 hwcap_FCMA = 1 << 14
33 hwcap_LRCPC = 1 << 15
34 hwcap_DCPOP = 1 << 16
35 hwcap_SHA3 = 1 << 17
36 hwcap_SM3 = 1 << 18
37 hwcap_SM4 = 1 << 19
38 hwcap_ASIMDDP = 1 << 20
39 hwcap_SHA512 = 1 << 21
40 hwcap_SVE = 1 << 22
41 hwcap_ASIMDFHM = 1 << 23
42)
43
44func detectOS(c *CPUInfo) bool {
45 // For now assuming no hyperthreading is reasonable.
46 c.LogicalCores = runtime.NumCPU()
47 c.PhysicalCores = c.LogicalCores
48 c.ThreadsPerCore = 1
49 if hwcap == 0 {
50 // We did not get values from the runtime.
51 // Try reading /proc/self/auxv
52
53 // From https://github.com/golang/sys
54 const (
55 _AT_HWCAP = 16
56 _AT_HWCAP2 = 26
57
58 uintSize = int(32 << (^uint(0) >> 63))
59 )
60
61 buf, err := ioutil.ReadFile("/proc/self/auxv")
62 if err != nil {
63 // e.g. on android /proc/self/auxv is not accessible, so silently
64 // ignore the error and leave Initialized = false. On some
65 // architectures (e.g. arm64) doinit() implements a fallback
66 // readout and will set Initialized = true again.
67 return false
68 }
69 bo := binary.LittleEndian
70 for len(buf) >= 2*(uintSize/8) {
71 var tag, val uint
72 switch uintSize {
73 case 32:
74 tag = uint(bo.Uint32(buf[0:]))
75 val = uint(bo.Uint32(buf[4:]))
76 buf = buf[8:]
77 case 64:
78 tag = uint(bo.Uint64(buf[0:]))
79 val = uint(bo.Uint64(buf[8:]))
80 buf = buf[16:]
81 }
82 switch tag {
83 case _AT_HWCAP:
84 hwcap = val
85 case _AT_HWCAP2:
86 // Not used
87 }
88 }
89 if hwcap == 0 {
90 return false
91 }
92 }
93
94 // HWCap was populated by the runtime from the auxiliary vector.
95 // Use HWCap information since reading aarch64 system registers
96 // is not supported in user space on older linux kernels.
97 c.featureSet.setIf(isSet(hwcap, hwcap_AES), AESARM)
98 c.featureSet.setIf(isSet(hwcap, hwcap_ASIMD), ASIMD)
99 c.featureSet.setIf(isSet(hwcap, hwcap_ASIMDDP), ASIMDDP)
100 c.featureSet.setIf(isSet(hwcap, hwcap_ASIMDHP), ASIMDHP)
101 c.featureSet.setIf(isSet(hwcap, hwcap_ASIMDRDM), ASIMDRDM)
102 c.featureSet.setIf(isSet(hwcap, hwcap_CPUID), ARMCPUID)
103 c.featureSet.setIf(isSet(hwcap, hwcap_CRC32), CRC32)
104 c.featureSet.setIf(isSet(hwcap, hwcap_DCPOP), DCPOP)
105 c.featureSet.setIf(isSet(hwcap, hwcap_EVTSTRM), EVTSTRM)
106 c.featureSet.setIf(isSet(hwcap, hwcap_FCMA), FCMA)
107 c.featureSet.setIf(isSet(hwcap, hwcap_FP), FP)
108 c.featureSet.setIf(isSet(hwcap, hwcap_FPHP), FPHP)
109 c.featureSet.setIf(isSet(hwcap, hwcap_JSCVT), JSCVT)
110 c.featureSet.setIf(isSet(hwcap, hwcap_LRCPC), LRCPC)
111 c.featureSet.setIf(isSet(hwcap, hwcap_PMULL), PMULL)
112 c.featureSet.setIf(isSet(hwcap, hwcap_SHA1), SHA1)
113 c.featureSet.setIf(isSet(hwcap, hwcap_SHA2), SHA2)
114 c.featureSet.setIf(isSet(hwcap, hwcap_SHA3), SHA3)
115 c.featureSet.setIf(isSet(hwcap, hwcap_SHA512), SHA512)
116 c.featureSet.setIf(isSet(hwcap, hwcap_SM3), SM3)
117 c.featureSet.setIf(isSet(hwcap, hwcap_SM4), SM4)
118 c.featureSet.setIf(isSet(hwcap, hwcap_SVE), SVE)
119
120 // The Samsung S9+ kernel reports support for atomics, but not all cores
121 // actually support them, resulting in SIGILL. See issue #28431.
122 // TODO(elias.naur): Only disable the optimization on bad chipsets on android.
123 c.featureSet.setIf(isSet(hwcap, hwcap_ATOMICS) && runtime.GOOS != "android", ATOMICS)
124
125 return true
126}
127
128func isSet(hwc uint, value uint) bool {
129 return hwc&value != 0
130}