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// SPDX-License-Identifier: Apache-2.0 OR MIT // // Copyright (c) 2018-2020 by the author(s) // // Author(s): // - Andre Richter <andre.o.richter@gmail.com> //! Low level access to Cortex-A processors. //! //! ## Currently Supported Architectures //! //! - [x] AArch64 //! - [ ] AArch32 //! //! ## Usage //! //! Example from https://github.com/rust-embedded/rust-raspberrypi-OS-tutorials //! //! ```rust //! unsafe fn el2_to_el1_transition() -> ! { //! // Enable timer counter registers for EL1. //! CNTHCTL_EL2.write(CNTHCTL_EL2::EL1PCEN::SET + CNTHCTL_EL2::EL1PCTEN::SET); //! //! // No offset for reading the counters. //! CNTVOFF_EL2.set(0); //! //! // Set EL1 execution state to AArch64. //! HCR_EL2.write(HCR_EL2::RW::EL1IsAarch64); //! //! // Set up a simulated exception return. //! SPSR_EL2.write( //! SPSR_EL2::D::Masked //! + SPSR_EL2::A::Masked //! + SPSR_EL2::I::Masked //! + SPSR_EL2::F::Masked //! + SPSR_EL2::M::EL1h, //! ); //! ``` //! //! ## Disclaimer //! //! Descriptive comments in the source files are taken from the //! [ARM Architecture Reference Manual ARMv8, for ARMv8-A architecture profile](https://static.docs.arm.com/ddi0487/ca/DDI0487C_a_armv8_arm.pdf?_ga=2.266626254.1122218691.1534883460-1326731866.1530967873). #![feature(core_intrinsics)] #![feature(custom_inner_attributes)] #![feature(asm)] #![no_std] pub mod asm; pub mod barrier; pub mod regs;