Merge remote-tracking branch 'origin/aarch64-rebase' into riscv64

.gitmodules

Cargo.lock

Cargo.toml

build.rs

linkers/aarch64.ld

src/allocator/linked_list.rs

src/arch/aarch64/consts.rs

src/arch/aarch64/debug.rs

src/arch/aarch64/device/cpu/mod.rs

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

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

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

src/arch/aarch64/device/generic_timer.rs

src/arch/aarch64/device/gic.rs

src/arch/aarch64/device/mod.rs

src/arch/aarch64/device/rtc.rs

src/arch/aarch64/device/serial.rs

src/arch/aarch64/device/uart_pl011.rs

src/arch/aarch64/init/device_tree/mod.rs

src/arch/aarch64/init/mod.rs