34 lines
1.1 KiB
C
34 lines
1.1 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2015 The Android Open Source Project
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef _BIONIC_PAGE_H_
|
||
|
|
#define _BIONIC_PAGE_H_
|
||
|
|
|
||
|
|
// Get PAGE_SIZE and PAGE_MASK.
|
||
|
|
#include <sys/user.h>
|
||
|
|
|
||
|
|
// Returns the address of the page containing address 'x'.
|
||
|
|
#define PAGE_START(x) ((x) & PAGE_MASK)
|
||
|
|
|
||
|
|
// Returns the offset of address 'x' in its page.
|
||
|
|
#define PAGE_OFFSET(x) ((x) & ~PAGE_MASK)
|
||
|
|
|
||
|
|
// Returns the address of the next page after address 'x', unless 'x' is
|
||
|
|
// itself at the start of a page.
|
||
|
|
#define PAGE_END(x) PAGE_START((x) + (PAGE_SIZE-1))
|
||
|
|
|
||
|
|
#endif // _BIONIC_PAGE_H_
|