From 0e2f1b7abd219f39d67cc2cecd00c441a13eeb29 Mon Sep 17 00:00:00 2001
From: Adin Scannell <ascannell@google.com>
Date: Mon, 27 Jan 2020 15:17:58 -0800
Subject: Update package locations.

Because the abi will depend on the core types for marshalling (usermem,
context, safemem, safecopy), these need to be flattened from the sentry
directory. These packages contain no sentry-specific details.

PiperOrigin-RevId: 291811289
---
 pkg/usermem/usermem_arm64.go | 53 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 pkg/usermem/usermem_arm64.go

(limited to 'pkg/usermem/usermem_arm64.go')

diff --git a/pkg/usermem/usermem_arm64.go b/pkg/usermem/usermem_arm64.go
new file mode 100644
index 000000000..fdfc30a66
--- /dev/null
+++ b/pkg/usermem/usermem_arm64.go
@@ -0,0 +1,53 @@
+// 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"
+	"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!")
+	}
+}
-- 
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