gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/pkg/sentry/time/tsc_arm64.s (about)

     1  // Copyright 2018 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  #include "textflag.h"
    16  
    17  TEXT ·Rdtsc(SB),NOSPLIT,$0-8
    18  	// Get the virtual counter.
    19  	ISB	$15
    20  	WORD	$0xd53be040     //MRS	CNTVCT_EL0, R0
    21  	MOVD	R0, ret+0(FP)
    22  	RET
    23  
    24  TEXT ·getCNTFRQ(SB),NOSPLIT,$0-8
    25  	// Get the virtual counter frequency.
    26  	WORD	$0xd53be000     //MRS	CNTFRQ_EL0, R0
    27  	MOVD	R0, ret+0(FP)
    28  	RET