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// 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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