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52 lines
767 B
ArmAsm
52 lines
767 B
ArmAsm
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// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "textflag.h"
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TEXT ·clflush(SB),NOSPLIT,$0-8
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MOVQ arg+0(FP), AX
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CLFLUSH 0(AX)
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RET
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TEXT ·rdtscp(SB),NOSPLIT,$0-8
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RDTSCP
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SHLQ $32, DX
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ORQ DX, AX
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MOVQ AX, ret+0(FP)
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RET
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TEXT ·nop(SB),NOSPLIT,$0-0
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RET
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TEXT ·cpuid(SB),NOSPLIT,$0-0
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CPUID
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RET
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TEXT ·features(SB),NOSPLIT,$0-2
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MOVL $0, AX
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MOVL $0, CX
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CPUID
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CMPL AX, $1
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JLT none
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MOVL $1, AX
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MOVL $0, CX
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CPUID
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SHRL $19, DX
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ANDL $1, DX
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MOVB DX, hasCLFLUSH+0(FP)
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MOVL $0x80000001, AX
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MOVL $0, CX
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CPUID
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SHRL $27, DX
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ANDL $1, DX
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MOVB DX, hasRDTSCP+0(FP)
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RET
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none:
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MOVB $0, hasCLFLUSH+0(FP)
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MOVB $0, hasRDTSCP+1(FP)
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RET
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