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howard zhang
cd9a89d4d8
Usually ARM counter-timer frequency is range from 1-50Mhz which is much less than that on x86, so we calibrate defaultOverheadCycles for ARM. Signed-off-by: howard zhang <[email protected]>
29 lines
898 B
ArmAsm
29 lines
898 B
ArmAsm
// Copyright 2018 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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TEXT ·Rdtsc(SB),NOSPLIT,$0-8
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// Get the virtual counter.
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ISB $15
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WORD $0xd53be040 //MRS CNTVCT_EL0, R0
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MOVD R0, ret+0(FP)
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RET
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TEXT ·getCNTFRQ(SB),NOSPLIT,$0-8
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// Get the virtual counter frequency.
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WORD $0xd53be000 //MRS CNTFRQ_EL0, R0
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MOVD R0, ret+0(FP)
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RET
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