54 lines
1.5 KiB
Go
54 lines
1.5 KiB
Go
// Copyright 2019 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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// +build arm64
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package usermem
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import (
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"encoding/binary"
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"syscall"
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)
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const (
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// PageSize is the system page size.
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// arm64 support 4K/16K/64K page size,
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// which can be get by syscall.Getpagesize().
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// Currently, only 4K page size is supported.
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PageSize = 1 << PageShift
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// HugePageSize is the system huge page size.
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HugePageSize = 1 << HugePageShift
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// PageShift is the binary log of the system page size.
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PageShift = 12
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// HugePageShift is the binary log of the system huge page size.
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// Should be calculated by "PageShift + (PageShift - 3)"
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// when multiple page size support is ready.
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HugePageShift = 21
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)
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var (
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// ByteOrder is the native byte order (little endian).
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ByteOrder = binary.LittleEndian
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)
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func init() {
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// Make sure the page size is 4K on arm64 platform.
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if size := syscall.Getpagesize(); size != PageSize {
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panic("Only 4K page size is supported on arm64!")
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}
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}
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