[syserror] Split usermem package

Split usermem package to help remove syserror dependency in go_marshal.
New hostarch package contains code not dependent on syserror.

PiperOrigin-RevId: 365651233

1 files changed, 38 insertions, 0 deletions

diff --git a/pkg/hostarch/hostarch_x86.go b/pkg/hostarch/hostarch_x86.go
new file mode 100644
index 000000000..af6ef2b7f
--- /dev/null
+++ b/pkg/hostarch/hostarch_x86.go
@@ -0,0 +1,38 @@
+// Copyright 2018 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 amd64 386
+
+package hostarch
+
+import "encoding/binary"
+
+const (
+	// PageSize is the system page size.
+	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.
+	HugePageShift = 21
+)
+
+var (
+	// ByteOrder is the native byte order (little endian).
+	ByteOrder = binary.LittleEndian
+)