cpu: refactor parsing of ARM64 registers into separate function
This will allow to re-use the implementation when adding support for
netbsd/arm64 which will retreive these register values using sysctl(3).
Change-Id: I2414cc4c6d1a91fff946466e4bf6d95d07f30137
Reviewed-on: https://go-review.googlesource.com/c/sys/+/264377
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
diff --git a/cpu/cpu_arm64.go b/cpu/cpu_arm64.go
index 2f64d3b..856dae3 100644
--- a/cpu/cpu_arm64.go
+++ b/cpu/cpu_arm64.go
@@ -64,9 +64,11 @@
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 +126,6 @@
}
// ID_AA64ISAR1_EL1
- isar1 := getisar1()
-
switch extractBits(isar1, 0, 3) {
case 1:
ARM64.HasDCPOP = true
@@ -147,8 +147,6 @@
}
// ID_AA64PFR0_EL1
- pfr0 := getpfr0()
-
switch extractBits(pfr0, 16, 19) {
case 0:
ARM64.HasFP = true
