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