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