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// Copyright (c) 2020 Klaus Post, released under MIT License. See LICENSE file.
package cpuid
import (
"runtime"
"strings"
"golang.org/x/sys/unix"
)
func detectOS(c *CPUInfo) bool {
if runtime.GOOS != "ios" {
tryToFillCPUInfoFomSysctl(c)
}
// There are no hw.optional sysctl values for the below features on Mac OS 11.0
// to detect their supported state dynamically. Assume the CPU features that
// Apple Silicon M1 supports to be available as a minimal set of features
// to all Go programs running on darwin/arm64.
// TODO: Add more if we know them.
c.featureSet.setIf(runtime.GOOS != "ios", AESARM, PMULL, SHA1, SHA2)
return true
}
func sysctlGetBool(name string) bool {
value, err := unix.SysctlUint32(name)
if err != nil {
return false
}
return value != 0
}
func sysctlGetString(name string) string {
value, err := unix.Sysctl(name)
if err != nil {
return ""
}
return value
}
func sysctlGetInt(unknown int, names ...string) int {
for _, name := range names {
value, err := unix.SysctlUint32(name)
if err != nil {
continue
}
if value != 0 {
return int(value)
}
}
return unknown
}
func sysctlGetInt64(unknown int, names ...string) int {
for _, name := range names {
value64, err := unix.SysctlUint64(name)
if err != nil {
continue
}
if int(value64) != unknown {
return int(value64)
}
}
return unknown
}
func setFeature(c *CPUInfo, name string, feature FeatureID) {
c.featureSet.setIf(sysctlGetBool(name), feature)
}
func tryToFillCPUInfoFomSysctl(c *CPUInfo) {
c.BrandName = sysctlGetString("machdep.cpu.brand_string")
if len(c.BrandName) != 0 {
c.VendorString = strings.Fields(c.BrandName)[0]
}
c.PhysicalCores = sysctlGetInt(runtime.NumCPU(), "hw.physicalcpu")
c.ThreadsPerCore = sysctlGetInt(1, "machdep.cpu.thread_count", "kern.num_threads") /
sysctlGetInt(1, "hw.physicalcpu")
c.LogicalCores = sysctlGetInt(runtime.NumCPU(), "machdep.cpu.core_count")
c.Family = sysctlGetInt(0, "machdep.cpu.family", "hw.cpufamily")
c.Model = sysctlGetInt(0, "machdep.cpu.model")
c.CacheLine = sysctlGetInt64(0, "hw.cachelinesize")
c.Cache.L1I = sysctlGetInt64(-1, "hw.l1icachesize")
c.Cache.L1D = sysctlGetInt64(-1, "hw.l1dcachesize")
c.Cache.L2 = sysctlGetInt64(-1, "hw.l2cachesize")
c.Cache.L3 = sysctlGetInt64(-1, "hw.l3cachesize")
// from https://developer.arm.com/downloads/-/exploration-tools/feature-names-for-a-profile
setFeature(c, "hw.optional.arm.FEAT_AES", AESARM)
setFeature(c, "hw.optional.AdvSIMD", ASIMD)
setFeature(c, "hw.optional.arm.FEAT_DotProd", ASIMDDP)
setFeature(c, "hw.optional.arm.FEAT_RDM", ASIMDRDM)
setFeature(c, "hw.optional.FEAT_CRC32", CRC32)
setFeature(c, "hw.optional.arm.FEAT_DPB", DCPOP)
// setFeature(c, "", EVTSTRM)
setFeature(c, "hw.optional.arm.FEAT_FCMA", FCMA)
setFeature(c, "hw.optional.arm.FEAT_FP", FP)
setFeature(c, "hw.optional.arm.FEAT_FP16", FPHP)
setFeature(c, "hw.optional.arm.FEAT_PAuth", GPA)
setFeature(c, "hw.optional.arm.FEAT_JSCVT", JSCVT)
setFeature(c, "hw.optional.arm.FEAT_LRCPC", LRCPC)
setFeature(c, "hw.optional.arm.FEAT_PMULL", PMULL)
setFeature(c, "hw.optional.arm.FEAT_SHA1", SHA1)
setFeature(c, "hw.optional.arm.FEAT_SHA256", SHA2)
setFeature(c, "hw.optional.arm.FEAT_SHA3", SHA3)
setFeature(c, "hw.optional.arm.FEAT_SHA512", SHA512)
// setFeature(c, "", SM3)
// setFeature(c, "", SM4)
setFeature(c, "hw.optional.arm.FEAT_SVE", SVE)
// from empirical observation
setFeature(c, "hw.optional.AdvSIMD_HPFPCvt", ASIMDHP)
setFeature(c, "hw.optional.armv8_1_atomics", ATOMICS)
setFeature(c, "hw.optional.floatingpoint", FP)
setFeature(c, "hw.optional.armv8_2_sha3", SHA3)
setFeature(c, "hw.optional.armv8_2_sha512", SHA512)
setFeature(c, "hw.optional.armv8_3_compnum", FCMA)
setFeature(c, "hw.optional.armv8_crc32", CRC32)
}
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