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//! Architecture-specific types and operations.

cfg_if::cfg_if! {
    if #[cfg(target_arch = "x86_64")] {
        mod x86_64;
        pub use self::x86_64::*;
    } else if #[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))] {
        mod riscv;
        pub use self::riscv::*;
    } else if #[cfg(target_arch = "aarch64")]{
        mod aarch64;
        pub use self::aarch64::*;
    }
}

#[cfg(feature = "monolithic")]
/// To write the trap frame into the kernel stack
///
/// # Safety
///
/// It should be guaranteed that the kstack address is valid and writable.
pub fn write_trapframe_to_kstack(kstack_top: usize, trap_frame: &TrapFrame) {
    let trap_frame_size = core::mem::size_of::<TrapFrame>();
    let trap_frame_ptr = (kstack_top - trap_frame_size) as *mut TrapFrame;
    unsafe {
        *trap_frame_ptr = *trap_frame;
    }
}

#[cfg(feature = "monolithic")]
/// To read the trap frame from the kernel stack
///
/// # Safety
///
/// It should be guaranteed that the kstack address is valid and readable.
pub fn read_trapframe_from_kstack(kstack_top: usize) -> TrapFrame {
    let trap_frame_size = core::mem::size_of::<TrapFrame>();
    let trap_frame_ptr = (kstack_top - trap_frame_size) as *mut TrapFrame;
    unsafe { *trap_frame_ptr }
}