| // Copyright 2024, 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. |
| |
| //! Low-level CPU-specific operations. |
| |
| #[cfg(target_arch = "aarch64")] |
| pub mod aarch64; |
| |
| /// Write with well-defined compiled behavior. |
| /// |
| /// See https://github.com/rust-lang/rust/issues/131894 |
| /// |
| /// # Safety |
| /// |
| /// `dst` must be valid for writes. |
| #[inline] |
| pub unsafe fn write_volatile_u8(dst: *mut u8, src: u8) { |
| cfg_if::cfg_if! { |
| if #[cfg(target_arch = "aarch64")] { |
| // SAFETY: `dst` is valid for writes. |
| unsafe { aarch64::strb(dst, src) } |
| } else { |
| compile_error!("Unsupported target_arch") |
| } |
| } |
| } |