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cpu: add HPDS, LOR, PAN detection for arm64

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This CL gets ID_AA64MMFR1_EL1, Memory Model Feature Register 1, and
grabs HPDS, LOR, PAN features from its bits.

Fixes golang/go#75472.

Change-Id: Ic04b109d79aceba9b3b1d3a1ea514fcf132007c5
GitHub-Last-Rev: f938ff468bca49cc7863aa26e7a880eec2823bb4
GitHub-Pull-Request: golang/sys#263
Reviewed-on: https://go-review.googlesource.com/c/sys/+/704075
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Chongyi Zheng
2025-10-28 09:43:50 -07:00
committed by Gopher Robot
parent ea436ef09d
commit 6239615695
7 changed files with 33 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files
cpu/cpu_arm64.s
+8
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@@ -22,6 +22,14 @@ TEXT ·getisar1(SB),NOSPLIT,$0-8
MOVD R0, ret+0(FP)
RET
// func getmmfr1() uint64
TEXT ·getmmfr1(SB),NOSPLIT,$0-8
// get Memory Model Feature Register 1 into x0
// mrs x0, ID_AA64MMFR1_EL1 = d5380720
WORD $0xd5380720
MOVD R0, ret+0(FP)
RET
// func getpfr0() uint64
TEXT ·getpfr0(SB),NOSPLIT,$0-8
// get Processor Feature Register 0 into x0