| Alice Wang | 0bdc3f6 | 2023-03-15 10:46:12 +0000 | [diff] [blame] | 1 | // Copyright 2023, The Android Open Source Project |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | //! Utility functions. |
| 16 | |
| 17 | pub(crate) const SIZE_4KB: usize = 4 << 10; |
| 18 | |
| 19 | /// Computes the low memory page address of the 4KiB page containing a given address. |
| 20 | pub(crate) fn page_address(addr: usize) -> u64 { |
| 21 | (addr & !(SIZE_4KB - 1)).try_into().unwrap() |
| 22 | } |