| // SPDX-License-Identifier: Apache-2.0 OR MIT |
| // |
| // Copyright (c) 2018-2022 by the author(s) |
| // |
| // Author(s): |
| // - Andre Richter <andre.o.richter@gmail.com> |
| |
| //! Stack Pointer Select |
| //! |
| //! Allows the Stack Pointer to be selected between SP_EL0 and SP_ELx. |
| |
| use tock_registers::{ |
| interfaces::{Readable, Writeable}, |
| register_bitfields, |
| }; |
| |
| register_bitfields! {u64, |
| pub SPSel [ |
| /// Stack pointer to use. Possible values of this bit are: |
| /// |
| /// 0 Use SP_EL0 at all Exception levels. |
| /// 1 Use SP_ELx for Exception level ELx. |
| /// |
| /// When this register has an architecturally-defined reset value, this field resets to 1. |
| SP OFFSET(0) NUMBITS(1) [ |
| EL0 = 0, |
| ELx = 1 |
| ] |
| ] |
| } |
| |
| pub struct Reg; |
| |
| impl Readable for Reg { |
| type T = u64; |
| type R = SPSel::Register; |
| |
| sys_coproc_read_raw!(u64, "SPSEL", "x"); |
| } |
| |
| impl Writeable for Reg { |
| type T = u64; |
| type R = SPSel::Register; |
| |
| sys_coproc_write_raw!(u64, "SPSEL", "x"); |
| } |
| |
| #[allow(non_upper_case_globals)] |
| pub const SPSel: Reg = Reg {}; |