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34 lines
1.1 KiB
Go
34 lines
1.1 KiB
Go
// Copyright 2020 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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//go:build arm64
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// +build arm64
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package pagetables
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// limitPCID is the maximum value of PCIDs.
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//
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// In VMSAv8-64, the PCID(ASID) size is an IMPLEMENTATION DEFINED choice
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// of 8 bits or 16 bits, and ID_AA64MMFR0_EL1.ASIDBits identifies the
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// supported size. When an implementation supports a 16-bit ASID, TCR_ELx.AS
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// selects whether the top 8 bits of the ASID are used.
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var limitPCID uint16
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// GetASIDBits return the system ASID bits, 8 or 16 bits.
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func GetASIDBits() uint8
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func init() {
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limitPCID = uint16(1)<<GetASIDBits() - 1
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}
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