1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef _BIONIC_PAGE_H_
18#define _BIONIC_PAGE_H_
19
20// Get PAGE_SIZE and PAGE_MASK.
21#include <sys/user.h>
22
23// Returns the address of the page containing address 'x'.
24#define PAGE_START(x) ((x) & PAGE_MASK)
25
26// Returns the offset of address 'x' in its page.
27#define PAGE_OFFSET(x) ((x) & ~PAGE_MASK)
28
29// Returns the address of the next page after address 'x', unless 'x' is
30// itself at the start of a page.
31#define PAGE_END(x) PAGE_START((x) + (PAGE_SIZE-1))
32
33#endif // _BIONIC_PAGE_H_
34