pub fn switchkvm() {
    unsafe {
        lcr3(KPGDIR.lock().to_phys());
    }
}
/// Switch HW page table register (control reg 3) to the kernel page table.  This is used when no process
/// is running.
Switch HW page table register (control reg 3) to the kernel page table.  This is used when no process
is running.
Switch HW page table register ( control reg 3 ) to the kernel page table . This is used when no process is running .
pub fn switchkvm() {
    unsafe {
        lcr3(KPGDIR.lock().to_phys());
    }
}
pub fn switchkvm ( ) { unsafe { lcr3 ( KPGDIR . lock ( ) . to_phys ( ) ) ; } }
Switch HW page table register (control reg 3) to the kernel page table.
Switch HW page table register ( control reg 3 ) to the kernel page table .