// SPDX-License-Identifier: MIT OR Apache-2.0
//
// Copyright (c) 2018-2022 Andre Richter <andre.o.richter@gmail.com>

//! Architectural synchronous and asynchronous exception handling.
//!
//! # Orientation
//!
//! Since arch modules are imported into generic modules using the path attribute, the path of this
//! file is:
//!
//! crate::exception::arch_exception

use aarch64_cpu::registers::*;
use tock_registers::interfaces::Readable;

//--------------------------------------------------------------------------------------------------
// Public Code
//--------------------------------------------------------------------------------------------------
use crate::exception::PrivilegeLevel;

/// The processing element's current privilege level.
pub fn current_privilege_level() -> (PrivilegeLevel, &'static str) {
    let el = CurrentEL.read_as_enum(CurrentEL::EL);
    match el {
        Some(CurrentEL::EL::Value::EL2) => (PrivilegeLevel::Hypervisor, "EL2"),
        Some(CurrentEL::EL::Value::EL1) => (PrivilegeLevel::Kernel, "EL1"),
        Some(CurrentEL::EL::Value::EL0) => (PrivilegeLevel::User, "EL0"),
        _ => (PrivilegeLevel::Unknown, "Unknown"),
    }
}