Merge branch 'paging-repr-packed' into 'master'

Use #[repr(packed)] with correct alignment for paging.

See merge request redox-os/kernel!124

src/arch/x86_64/paging/entry.rs

@@ -6,6 +6,7 @@ use crate::memory::Frame;
 use super::PhysicalAddress;
 
 /// A page table entry
+#[repr(packed(8))]
 pub struct Entry(u64);
 
 bitflags! {

src/arch/x86_64/paging/table.rs

@@ -39,6 +39,7 @@ impl HierarchicalLevel for Level2 {
     type NextLevel = Level1;
 }
 
+#[repr(packed(4096))]
 pub struct Table<L: TableLevel> {
     entries: [Entry; ENTRY_COUNT],
     level: PhantomData<L>,