Merge branch 'aarch64-stuff' into 'master'

rmm

src/allocator/mod.rs

src/arch/aarch64/consts.rs

src/arch/aarch64/device/cpu/registers/control_regs.rs

src/arch/aarch64/interrupt/handler.rs

src/arch/aarch64/paging/entry.rs

src/arch/aarch64/paging/mod.rs

src/arch/aarch64/rmm.rs

src/arch/aarch64/start.rs

src/arch/x86/paging/mod.rs

src/arch/x86_64/paging/mod.rs

src/context/list.rs

src/syscall/driver.rs