diff options
| -rw-r--r-- | pkg/sentry/usermem/BUILD | 1 | ||||
| -rw-r--r-- | pkg/sentry/usermem/usermem_arm64.go | 53 |
2 files changed, 54 insertions, 0 deletions
diff --git a/pkg/sentry/usermem/BUILD b/pkg/sentry/usermem/BUILD index 69ba919e0..dae41ed0e 100644 --- a/pkg/sentry/usermem/BUILD +++ b/pkg/sentry/usermem/BUILD @@ -24,6 +24,7 @@ go_library( "bytes_io.go", "bytes_io_unsafe.go", "usermem.go", + "usermem_arm64.go", "usermem_x86.go", ], importpath = "gvisor.googlesource.com/gvisor/pkg/sentry/usermem", diff --git a/pkg/sentry/usermem/usermem_arm64.go b/pkg/sentry/usermem/usermem_arm64.go new file mode 100644 index 000000000..7fd4ce963 --- /dev/null +++ b/pkg/sentry/usermem/usermem_arm64.go @@ -0,0 +1,53 @@ +// Copyright 2019 Google LLC +// +// 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" + "syscall" +) + +const ( + // PageSize is the system page size. + // arm64 support 4K/16K/64K page size, + // which can be get by syscall.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 := syscall.Getpagesize(); size != PageSize { + panic("Only 4K page size is supported on arm64!") + } +} |