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cpu: fix 32-bit ARMv8 CPU flags

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32-bit ARMv8 Crypto Extensions are exposed through AT_HWCAP2.

IDIV is not an individual flag, but indicates both IDIVA and IDIVT are
present.
This commit is contained in:
Yaakov Selkowitz 2022-10-14 16:11:41 -04:00
parent d8890a6ffe
commit 223205595b
1 changed files with 27 additions and 13 deletions
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40
source/cpu/cpuid_arm.go
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@ -18,11 +18,13 @@ package cpu
/*
#include <sys/auxv.h>
#define HWCAP_CPUID (1 << 11)
unsigned long gethwcap() {
return getauxval(AT_HWCAP);
}
unsigned long gethwcap2() {
return getauxval(AT_HWCAP2);
}
*/
import "C"
@ -51,15 +53,17 @@ const (
CPU_ARM_FEATURE_VFPv4
CPU_ARM_FEATURE_IDIVA
CPU_ARM_FEATURE_IDIVT
CPU_ARM_FEATURE_IDIV
CPU_ARM_FEATURE_VFPD32
CPU_ARM_FEATURE_LPAE
CPU_ARM_FEATURE_EVTSTRM
CPU_ARM_FEATURE_AES
CPU_ARM_FEATURE_PMULL
CPU_ARM_FEATURE_SHA1
CPU_ARM_FEATURE_SHA2
CPU_ARM_FEATURE_CRC32
)
const (
CPU_ARM_FEATURE2_AES = 1 << iota
CPU_ARM_FEATURE2_PMULL
CPU_ARM_FEATURE2_SHA1
CPU_ARM_FEATURE2_SHA2
CPU_ARM_FEATURE2_CRC32
)
var flagNames_arm = map[uint64]string{
@ -82,20 +86,23 @@ var flagNames_arm = map[uint64]string{
CPU_ARM_FEATURE_VFPv4: "VFPv4",
CPU_ARM_FEATURE_IDIVA: "IDIVA",
CPU_ARM_FEATURE_IDIVT: "IDIVT",
CPU_ARM_FEATURE_IDIV: "IDIV",
CPU_ARM_FEATURE_VFPD32: "VFPD32",
CPU_ARM_FEATURE_LPAE: "LPAE",
CPU_ARM_FEATURE_EVTSTRM: "EVTSTRM",
CPU_ARM_FEATURE_AES: "AES",
CPU_ARM_FEATURE_PMULL: "PMULL",
CPU_ARM_FEATURE_SHA1: "SHA1",
CPU_ARM_FEATURE_SHA2: "SHA2",
CPU_ARM_FEATURE_CRC32: "CRC32",
}
var flag2Names_arm = map[uint64]string{
CPU_ARM_FEATURE2_AES: "AES",
CPU_ARM_FEATURE2_PMULL: "PMULL",
CPU_ARM_FEATURE2_SHA1: "SHA1",
CPU_ARM_FEATURE2_SHA2: "SHA2",
CPU_ARM_FEATURE2_CRC32: "CRC32",
}
func getCpuidFlags() []string {
r := make([]string, 0, 20)
hwcap := uint64(C.gethwcap())
hwcap2 := uint64(C.gethwcap2())
for i := uint(0); i < 64; i++ {
key := uint64(1 << i)
val, ok := flagNames_arm[key]
@ -103,5 +110,12 @@ func getCpuidFlags() []string {
r = append(r, val)
}
}
for i := uint(0); i < 64; i++ {
key := uint64(1 << i)
val, ok := flag2Names_arm[key]
if hwcap2&key != 0 && ok {
r = append(r, val)
}
}
return r
}