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Revert "cpu: add HPDS, LOR, PAN detection for arm64"

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This reverts CL 704075.

Reason for revert: Based on golang/go#76386, it doesn't seem to work correctly.

Fixes golang/go#76386.

Change-Id: I51ccbc8715c25c0d061d56dfbf0e8158f1207018
Reviewed-on: https://go-review.googlesource.com/c/sys/+/724160
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Cherry Mui <cherryyz@google.com>
This commit is contained in:
Cherry Mui
2025-11-24 15:42:25 -08:00
committed by Gopher Robot
parent ca631161e4
commit 4f4f1c6fea
7 changed files with 4 additions and 32 deletions
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cpu/cpu_arm64.go
+2 -18
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@@ -65,10 +65,10 @@ func setMinimalFeatures() {
func readARM64Registers() {
Initialized = true
parseARM64SystemRegisters(getisar0(), getisar1(), getmmfr1(), getpfr0())
parseARM64SystemRegisters(getisar0(), getisar1(), getpfr0())
}
func parseARM64SystemRegisters(isar0, isar1, mmfr1, pfr0 uint64) {
func parseARM64SystemRegisters(isar0, isar1, pfr0 uint64) {
// ID_AA64ISAR0_EL1
switch extractBits(isar0, 4, 7) {
case 1:
@@ -152,22 +152,6 @@ func parseARM64SystemRegisters(isar0, isar1, mmfr1, pfr0 uint64) {
ARM64.HasI8MM = true
}
// ID_AA64MMFR1_EL1
switch extractBits(mmfr1, 12, 15) {
case 1, 2:
ARM64.HasHPDS = true
}
switch extractBits(mmfr1, 16, 19) {
case 1:
ARM64.HasLOR = true
}
switch extractBits(mmfr1, 20, 23) {
case 1, 2, 3:
ARM64.HasPAN = true
}
// ID_AA64PFR0_EL1
switch extractBits(pfr0, 16, 19) {
case 0: