Long Mode
Long Mode is an operating mode in x86-64 processors that enables 64-bit computing, providing access to 64-bit registers, a larger virtual address space (up to 256 TB), and support for modern features like hardware virtualization. It is the native mode for 64-bit operating systems like Linux, Windows, and macOS on AMD64 and Intel 64 architectures, replacing legacy modes like Real Mode and Protected Mode for 64-bit applications.
Developers should learn about Long Mode when working on low-level systems programming, operating system development, or performance-critical applications that require 64-bit addressing and enhanced processor capabilities. It is essential for tasks such as writing bootloaders, kernel code, or device drivers that need to leverage the full power of modern x86-64 hardware, including features like larger memory support and improved security mechanisms.