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Pierre-Clément Tosida4440a2022-08-22 18:06:32 +01001// Copyright 2022, 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//! Miscellaneous helper functions.
16
Pierre-Clément Tosi5bbfca52022-10-21 12:14:35 +010017pub const FDT_MAX_SIZE: usize = 2 << 20;
Pierre-Clément Tosif0f9b8b2022-10-19 10:12:49 +010018pub const SIZE_4KB: usize = 4 << 10;
19
Pierre-Clément Tosida4440a2022-08-22 18:06:32 +010020/// Computes the address of the page containing a given address.
Pierre-Clément Tosi446136e2022-10-19 10:10:42 +010021pub const fn page_of(addr: usize, page_size: usize) -> usize {
Pierre-Clément Tosida4440a2022-08-22 18:06:32 +010022 addr & !(page_size - 1)
23}
24
Pierre-Clément Tosida4440a2022-08-22 18:06:32 +010025/// Computes the address of the 4KiB page containing a given address.
Pierre-Clément Tosi446136e2022-10-19 10:10:42 +010026pub const fn page_4kb_of(addr: usize) -> usize {
Pierre-Clément Tosif0f9b8b2022-10-19 10:12:49 +010027 page_of(addr, SIZE_4KB)
Pierre-Clément Tosida4440a2022-08-22 18:06:32 +010028}