diff options
Diffstat (limited to 'vendor/golang.org/x/sys/cpu/hwcap_linux.go')
| -rw-r--r-- | vendor/golang.org/x/sys/cpu/hwcap_linux.go | 71 |
1 files changed, 0 insertions, 71 deletions
diff --git a/vendor/golang.org/x/sys/cpu/hwcap_linux.go b/vendor/golang.org/x/sys/cpu/hwcap_linux.go deleted file mode 100644 index 34e49f9..0000000 --- a/vendor/golang.org/x/sys/cpu/hwcap_linux.go +++ /dev/null | |||
| @@ -1,71 +0,0 @@ | |||
| 1 | // Copyright 2019 The Go Authors. All rights reserved. | ||
| 2 | // Use of this source code is governed by a BSD-style | ||
| 3 | // license that can be found in the LICENSE file. | ||
| 4 | |||
| 5 | package cpu | ||
| 6 | |||
| 7 | import ( | ||
| 8 | "os" | ||
| 9 | ) | ||
| 10 | |||
| 11 | const ( | ||
| 12 | _AT_HWCAP = 16 | ||
| 13 | _AT_HWCAP2 = 26 | ||
| 14 | |||
| 15 | procAuxv = "/proc/self/auxv" | ||
| 16 | |||
| 17 | uintSize = int(32 << (^uint(0) >> 63)) | ||
| 18 | ) | ||
| 19 | |||
| 20 | // For those platforms don't have a 'cpuid' equivalent we use HWCAP/HWCAP2 | ||
| 21 | // These are initialized in cpu_$GOARCH.go | ||
| 22 | // and should not be changed after they are initialized. | ||
| 23 | var hwCap uint | ||
| 24 | var hwCap2 uint | ||
| 25 | |||
| 26 | func readHWCAP() error { | ||
| 27 | // For Go 1.21+, get auxv from the Go runtime. | ||
| 28 | if a := getAuxv(); len(a) > 0 { | ||
| 29 | for len(a) >= 2 { | ||
| 30 | tag, val := a[0], uint(a[1]) | ||
| 31 | a = a[2:] | ||
| 32 | switch tag { | ||
| 33 | case _AT_HWCAP: | ||
| 34 | hwCap = val | ||
| 35 | case _AT_HWCAP2: | ||
| 36 | hwCap2 = val | ||
| 37 | } | ||
| 38 | } | ||
| 39 | return nil | ||
| 40 | } | ||
| 41 | |||
| 42 | buf, err := os.ReadFile(procAuxv) | ||
| 43 | if err != nil { | ||
| 44 | // e.g. on android /proc/self/auxv is not accessible, so silently | ||
| 45 | // ignore the error and leave Initialized = false. On some | ||
| 46 | // architectures (e.g. arm64) doinit() implements a fallback | ||
| 47 | // readout and will set Initialized = true again. | ||
| 48 | return err | ||
| 49 | } | ||
| 50 | bo := hostByteOrder() | ||
| 51 | for len(buf) >= 2*(uintSize/8) { | ||
| 52 | var tag, val uint | ||
| 53 | switch uintSize { | ||
| 54 | case 32: | ||
| 55 | tag = uint(bo.Uint32(buf[0:])) | ||
| 56 | val = uint(bo.Uint32(buf[4:])) | ||
| 57 | buf = buf[8:] | ||
| 58 | case 64: | ||
| 59 | tag = uint(bo.Uint64(buf[0:])) | ||
| 60 | val = uint(bo.Uint64(buf[8:])) | ||
| 61 | buf = buf[16:] | ||
| 62 | } | ||
| 63 | switch tag { | ||
| 64 | case _AT_HWCAP: | ||
| 65 | hwCap = val | ||
| 66 | case _AT_HWCAP2: | ||
| 67 | hwCap2 = val | ||
| 68 | } | ||
| 69 | } | ||
| 70 | return nil | ||
| 71 | } | ||