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// SPDX-License-Identifier: BSD-3-Clause
//go:build darwin && arm64
package cpu
import (
"encoding/binary"
"fmt"
"unsafe"
"github.com/shirou/gopsutil/v4/internal/common"
)
// https://github.com/shoenig/go-m1cpu/blob/v0.1.6/cpu.go
func getFrequency() (float64, error) {
ioKit, err := common.NewLibrary(common.IOKit)
if err != nil {
return 0, err
}
defer ioKit.Close()
coreFoundation, err := common.NewLibrary(common.CoreFoundation)
if err != nil {
return 0, err
}
defer coreFoundation.Close()
ioServiceMatching := common.GetFunc[common.IOServiceMatchingFunc](ioKit, common.IOServiceMatchingSym)
ioServiceGetMatchingServices := common.GetFunc[common.IOServiceGetMatchingServicesFunc](ioKit, common.IOServiceGetMatchingServicesSym)
ioIteratorNext := common.GetFunc[common.IOIteratorNextFunc](ioKit, common.IOIteratorNextSym)
ioRegistryEntryGetName := common.GetFunc[common.IORegistryEntryGetNameFunc](ioKit, common.IORegistryEntryGetNameSym)
ioRegistryEntryCreateCFProperty := common.GetFunc[common.IORegistryEntryCreateCFPropertyFunc](ioKit, common.IORegistryEntryCreateCFPropertySym)
ioObjectRelease := common.GetFunc[common.IOObjectReleaseFunc](ioKit, common.IOObjectReleaseSym)
cfStringCreateWithCString := common.GetFunc[common.CFStringCreateWithCStringFunc](coreFoundation, common.CFStringCreateWithCStringSym)
cfDataGetLength := common.GetFunc[common.CFDataGetLengthFunc](coreFoundation, common.CFDataGetLengthSym)
cfDataGetBytePtr := common.GetFunc[common.CFDataGetBytePtrFunc](coreFoundation, common.CFDataGetBytePtrSym)
cfRelease := common.GetFunc[common.CFReleaseFunc](coreFoundation, common.CFReleaseSym)
matching := ioServiceMatching("AppleARMIODevice")
var iterator uint32
if status := ioServiceGetMatchingServices(common.KIOMainPortDefault, uintptr(matching), &iterator); status != common.KERN_SUCCESS {
return 0.0, fmt.Errorf("IOServiceGetMatchingServices error=%d", status)
}
defer ioObjectRelease(iterator)
pCorekey := cfStringCreateWithCString(common.KCFAllocatorDefault, "voltage-states5-sram", common.KCFStringEncodingUTF8)
defer cfRelease(uintptr(pCorekey))
var pCoreHz uint32
for {
service := ioIteratorNext(iterator)
if !(service > 0) {
break
}
buf := common.NewCStr(512)
ioRegistryEntryGetName(service, buf)
if buf.GoString() == "pmgr" {
pCoreRef := ioRegistryEntryCreateCFProperty(service, uintptr(pCorekey), common.KCFAllocatorDefault, common.KNilOptions)
length := cfDataGetLength(uintptr(pCoreRef))
data := cfDataGetBytePtr(uintptr(pCoreRef))
// composite uint32 from the byte array
buf := unsafe.Slice((*byte)(data), length)
// combine the bytes into a uint32 value
b := buf[length-8 : length-4]
pCoreHz = binary.LittleEndian.Uint32(b)
ioObjectRelease(service)
break
}
ioObjectRelease(service)
}
return float64(pCoreHz / 1_000_000), nil
}
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