25 lines
902 B
ArmAsm
25 lines
902 B
ArmAsm
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// Copyright 2018 Google Inc.
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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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// func GetCPU() (cpu uint32)
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TEXT ·GetCPU(SB), NOSPLIT, $0-4
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BYTE $0x0f; BYTE $0x01; BYTE $0xf9; // RDTSCP
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// On Linux, the bottom 12 bits of IA32_TSC_AUX are CPU and the upper 20
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// are node. See arch/x86/entry/vdso/vma.c:vgetcpu_cpu_init().
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ANDL $0xfff, CX
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MOVL CX, cpu+0(FP)
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RET
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