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// Copyright 2022, 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.
//! Miscellaneous helper functions.
pub const SIZE_4KB: usize = 4 << 10;
pub const SIZE_2MB: usize = 2 << 20;
/// Computes the address of the page containing a given address.
pub const fn page_of(addr: usize, page_size: usize) -> usize {
addr & !(page_size - 1)
}
/// Computes the address of the 4KiB page containing a given address.
pub const fn page_4kb_of(addr: usize) -> usize {
page_of(addr, SIZE_4KB)
}