| Elliott Hughes | afab3ff | 2015-07-28 14:58:37 -0700 | [diff] [blame] | 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 | |
| Elliott Hughes | cdb52fc | 2019-12-12 15:26:14 -0800 | [diff] [blame] | 17 | #pragma once |
| Elliott Hughes | afab3ff | 2015-07-28 14:58:37 -0700 | [diff] [blame] | 18 | |
| 19 | // Get PAGE_SIZE and PAGE_MASK. |
| 20 | #include <sys/user.h> |
| 21 | |
| 22 | // Returns the address of the page containing address 'x'. |
| 23 | #define PAGE_START(x) ((x) & PAGE_MASK) |
| 24 | |
| 25 | // Returns the offset of address 'x' in its page. |
| 26 | #define PAGE_OFFSET(x) ((x) & ~PAGE_MASK) |
| 27 | |
| 28 | // Returns the address of the next page after address 'x', unless 'x' is |
| 29 | // itself at the start of a page. |
| 30 | #define PAGE_END(x) PAGE_START((x) + (PAGE_SIZE-1)) |