| // Copyright 2023, 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. |
| |
| //! Utility functions for memory management. |
| |
| use core::ptr::NonNull; |
| |
| /// Returns the intermediate physical address corresponding to the given virtual address. |
| /// |
| /// As we use identity mapping for everything, this is just a cast, but it's useful to use it to be |
| /// explicit about where we are converting from virtual to physical address. |
| pub fn virt_to_phys(vaddr: NonNull<u8>) -> usize { |
| vaddr.as_ptr() as _ |
| } |
| |
| /// Returns a pointer for the virtual address corresponding to the given non-zero intermediate |
| /// physical address. |
| /// |
| /// Panics if `paddr` is 0. |
| pub fn phys_to_virt(paddr: usize) -> NonNull<u8> { |
| NonNull::new(paddr as _).unwrap() |
| } |