diff options
Diffstat (limited to 'vendor/golang.org/x/sys/cpu/cpu_arm64.go')
| -rw-r--r-- | vendor/golang.org/x/sys/cpu/cpu_arm64.go | 40 |
1 files changed, 18 insertions, 22 deletions
diff --git a/vendor/golang.org/x/sys/cpu/cpu_arm64.go b/vendor/golang.org/x/sys/cpu/cpu_arm64.go index 2f64d3b39..87dd5e302 100644 --- a/vendor/golang.org/x/sys/cpu/cpu_arm64.go +++ b/vendor/golang.org/x/sys/cpu/cpu_arm64.go @@ -39,34 +39,34 @@ func initOptions() { func archInit() { switch runtime.GOOS { - case "android", "darwin", "ios", "netbsd", "openbsd": - // Android and iOS don't seem to allow reading these registers. - // - // NetBSD: - // ID_AA64ISAR0_EL1 is a privileged register and cannot be read from EL0. - // It can be read via sysctl(3). Example for future implementers: - // https://nxr.netbsd.org/xref/src/usr.sbin/cpuctl/arch/aarch64.c + case "freebsd": + readARM64Registers() + case "linux", "netbsd": + doinit() + default: + // Most platforms don't seem to allow reading these registers. // // OpenBSD: // See https://golang.org/issue/31746 - // - // Fake the minimal features expected by - // TestARM64minimalFeatures. - ARM64.HasASIMD = true - ARM64.HasFP = true - case "linux": - doinit() - default: - readARM64Registers() + setMinimalFeatures() } } +// setMinimalFeatures fakes the minimal ARM64 features expected by +// TestARM64minimalFeatures. +func setMinimalFeatures() { + ARM64.HasASIMD = true + ARM64.HasFP = true +} + func readARM64Registers() { Initialized = true - // ID_AA64ISAR0_EL1 - isar0 := getisar0() + parseARM64SystemRegisters(getisar0(), getisar1(), getpfr0()) +} +func parseARM64SystemRegisters(isar0, isar1, pfr0 uint64) { + // ID_AA64ISAR0_EL1 switch extractBits(isar0, 4, 7) { case 1: ARM64.HasAES = true @@ -124,8 +124,6 @@ func readARM64Registers() { } // ID_AA64ISAR1_EL1 - isar1 := getisar1() - switch extractBits(isar1, 0, 3) { case 1: ARM64.HasDCPOP = true @@ -147,8 +145,6 @@ func readARM64Registers() { } // ID_AA64PFR0_EL1 - pfr0 := getpfr0() - switch extractBits(pfr0, 16, 19) { case 0: ARM64.HasFP = true |