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//! Architecture-specific primitives for Tartan OS

#![no_std]
#![feature(doc_cfg)]
#![warn(missing_docs)]
#![warn(clippy::pedantic)]
#![allow(clippy::must_use_candidate)]
#![allow(clippy::upper_case_acronyms)]

use core::arch::asm;

#[cfg(any(target_arch = "aarch64", doc))]
#[doc(cfg(target_arch = "aarch64"))]
#[macro_use]
pub mod aarch64;

#[cfg(any(target_arch = "arm", doc))]
#[doc(cfg(target_arch = "arm"))]
#[macro_use]
pub mod arm;

#[cfg(any(target_arch = "x86_64", doc))]
#[doc(cfg(target_arch = "x86_64"))]
pub mod x86_64;

#[cfg(any(target_arch = "x86", doc))]
#[doc(cfg(target_arch = "x86"))]
pub mod x86;

#[cfg(any(target_arch = "x86", target_arch = "x86_64", doc))]
#[doc(cfg(any(target_arch = "x86", target_arch = "x86_64")))]
#[macro_use]
pub mod x86_common;


/// Unconditionally transfer control to the instruction at the given address
///
/// # Safety
/// Make sure you know where you're going. You're not coming back.
#[cfg(any(target_arch = "x86", target_arch = "x86_64", doc))]
#[allow(clippy::missing_panics_doc)]
pub unsafe fn jump(address: usize) -> ! {
    asm!("jmp {}", in(reg) address);
    unreachable!();
}

/// Unconditionally transfer control to the instruction at the given address
///
/// # Safety
/// Make sure you know where you're going. You're not coming back.
#[cfg(target_arch = "arm")]
#[allow(clippy::missing_panics_doc)]
pub unsafe fn jump(address: usize) -> ! {
    asm!("bx {}", in(reg) address);
    unreachable!();
}

/// Unconditionally transfer control to the instruction at the given address
///
/// # Safety
/// Make sure you know where you're going. You're not coming back.
#[cfg(target_arch = "aarch64")]
#[allow(clippy::missing_panics_doc)]
pub unsafe fn jump(address: usize) -> ! {
    asm!("br {}", in(reg) address);
    unreachable!();
}