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cpu: implement CPU feature detection for openbsd/arm64

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OpenBSD 7.1 onwards expose the aarch64 ISAR0 and ISAR1 registers via sysctl:

  $ sysctl machdep
  machdep.compatible=apple,j274
  machdep.id_aa64isar0=153421459058925856
  machdep.id_aa64isar1=1172796674562

Implement CPU feature detection for openbsd/arm64 based on this information.

Updates golang/go#31746

Change-Id: I6dc473d93ccff720582c05b75456de51269bc3e5
Reviewed-on: https://go-review.googlesource.com/c/sys/+/421799
Run-TryBot: Joel Sing <joel@sing.id.au>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Joel Sing
2022-08-08 15:39:00 +00:00
committed by Gopher Robot
parent e9af53b607
commit 3d627bb497
4 changed files with 80 additions and 7 deletions
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cpu/cpu_arm64.go
+2 -5
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@@ -41,13 +41,10 @@ func archInit() {
switch runtime.GOOS {
case "freebsd":
readARM64Registers()
case "linux", "netbsd":
case "linux", "netbsd", "openbsd":
doinit()
default:
// Most platforms don't seem to allow reading these registers.
//
// OpenBSD:
// See https://golang.org/issue/31746
// Many platforms don't seem to allow reading these registers.
setMinimalFeatures()
}
}