Unify logic for BIOS and UEFI

Cargo.lock

Cargo.toml

src/arch/aarch64/mod.rs

src/arch/aarch64/paging.rs

src/arch/mod.rs

src/arch/x86_64/paging.rs

src/main.rs

src/os/bios/mod.rs

src/os/bios/vga.rs

src/os/mod.rs

src/os/uefi/arch/aarch64/mod.rs

src/os/uefi/arch/x86_64/memory_map.rs

src/os/uefi/arch/x86_64/mod.rs

src/os/uefi/arch/x86_64/paging.rs

src/os/uefi/arch/x86_64/video_mode.rs

src/os/uefi/display.rs

src/os/uefi/key.rs

src/os/uefi/mod.rs

src/os/uefi/text.rs