diff options
Diffstat (limited to 'pkg/sentry/platform/ring0/pagetables/pagetables_amd64.go')
| -rw-r--r-- | pkg/sentry/platform/ring0/pagetables/pagetables_amd64.go | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/pkg/sentry/platform/ring0/pagetables/pagetables_amd64.go b/pkg/sentry/platform/ring0/pagetables/pagetables_amd64.go new file mode 100644 index 000000000..7aa6c524e --- /dev/null +++ b/pkg/sentry/platform/ring0/pagetables/pagetables_amd64.go @@ -0,0 +1,45 @@ +// 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. + +package pagetables + +// Address constraints. +// +// The lowerTop and upperBottom currently apply to four-level pagetables; +// additional refactoring would be necessary to support five-level pagetables. +const ( + lowerTop = 0x00007fffffffffff + upperBottom = 0xffff800000000000 + + pteShift = 12 + pmdShift = 21 + pudShift = 30 + pgdShift = 39 + + pteMask = 0x1ff << pteShift + pmdMask = 0x1ff << pmdShift + pudMask = 0x1ff << pudShift + pgdMask = 0x1ff << pgdShift + + pteSize = 1 << pteShift + pmdSize = 1 << pmdShift + pudSize = 1 << pudShift + pgdSize = 1 << pgdShift + + executeDisable = 1 << 63 + entriesPerPage = 512 +) + +// PTEs is a collection of entries. +type PTEs [entriesPerPage]PTE |