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// Copyright 2019 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build arm64
package usermem
import (
"encoding/binary"
"golang.org/x/sys/unix"
)
const (
// PageSize is the system page size.
// arm64 support 4K/16K/64K page size,
// which can be get by unix.Getpagesize().
// Currently, only 4K page size is supported.
PageSize = 1 << PageShift
// HugePageSize is the system huge page size.
HugePageSize = 1 << HugePageShift
// PageShift is the binary log of the system page size.
PageShift = 12
// HugePageShift is the binary log of the system huge page size.
// Should be calculated by "PageShift + (PageShift - 3)"
// when multiple page size support is ready.
HugePageShift = 21
)
var (
// ByteOrder is the native byte order (little endian).
ByteOrder = binary.LittleEndian
)
func init() {
// Make sure the page size is 4K on arm64 platform.
if size := unix.Getpagesize(); size != PageSize {
panic("Only 4K page size is supported on arm64!")
}
}
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