trapframe 0.10.1

Handle Trap Frame across kernel and user space on multiple ISAs.
Documentation 
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use alloc::boxed::Box;
use core::arch::asm;
use x86_64::structures::idt::*;
use x86_64::structures::DescriptorTablePointer;
use x86_64::{PrivilegeLevel, VirtAddr};

pub fn init() {
    extern "C" {
        #[link_name = "__vectors"]
        static VECTORS: [extern "C" fn(); 256];
    }

    let idt = Box::leak(Box::new(InterruptDescriptorTable::new()));
    // let idt = sidt().base;
    let entries: &'static mut [Entry<HandlerFunc>; 256] =
        unsafe { core::mem::transmute_copy(&idt) };
    for i in 0..256 {
        let opt = entries[i].set_handler_fn(unsafe { core::mem::transmute(VECTORS[i]) });
        // Enable user space `int3` and `into`
        if i == 3 || i == 4 {
            opt.set_privilege_level(PrivilegeLevel::Ring3);
        }
    }
    idt.load();
}

/// Get current IDT register
#[allow(dead_code)]
#[inline]
fn sidt() -> DescriptorTablePointer {
    let mut dtp = DescriptorTablePointer {
        limit: 0,
        base: VirtAddr::zero(),
    };
    unsafe {
        asm!("sidt [{}]", in(reg) &mut dtp);
    }
    dtp
}