DragonOS/kernel/src/arch/x86_64/asm/irqflags.rs

use core::arch::asm;

#[inline]
pub fn local_irq_save() -> usize {
    let x: usize;
    // x86_64::registers::rflags::
    unsafe {
        asm!("pushfq; pop {}; cli", out(reg) x, options(nomem, preserves_flags));
    }
    x
}

#[inline]
// 恢复先前保存的rflags的值x
pub fn local_irq_restore(x: usize) {
    unsafe {
        asm!("push {}; popfq", in(reg) x, options(nomem, preserves_flags));
    }
}