From cabe10e603f36d610b7d3858c0911fc2dde26411 Mon Sep 17 00:00:00 2001
From: Haibo Xu <haibo.xu@arm.com>
Date: Tue, 17 Sep 2019 08:27:01 +0000
Subject: Enable pkg/sentry/hostcpu support on arm64.

Signed-off-by: Haibo Xu haibo.xu@arm.com
Change-Id: I333872da9bdf56ddfa8ab2f034dfc1f36a7d3132
---
 pkg/sentry/hostcpu/getcpu_arm64.s | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 pkg/sentry/hostcpu/getcpu_arm64.s

(limited to 'pkg/sentry/hostcpu/getcpu_arm64.s')

diff --git a/pkg/sentry/hostcpu/getcpu_arm64.s b/pkg/sentry/hostcpu/getcpu_arm64.s
new file mode 100644
index 000000000..caf9abb89
--- /dev/null
+++ b/pkg/sentry/hostcpu/getcpu_arm64.s
@@ -0,0 +1,28 @@
+// Copyright 2019 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "textflag.h"
+
+// GetCPU makes the getcpu(unsigned *cpu, unsigned *node, NULL) syscall for
+// the lack of an optimazed way of getting the current CPU number on arm64.
+
+// func GetCPU() (cpu uint32)
+TEXT ·GetCPU(SB), NOSPLIT, $0-4
+	MOVW ZR, cpu+0(FP)
+	MOVD $cpu+0(FP), R0
+	MOVD $0x0, R1  // unused
+	MOVD $0x0, R2  // unused
+	MOVD $0xA8, R8 // SYS_GETCPU
+	SVC
+	RET
-- 
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