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