Tag
x86-64
- Mar 31, 2026 How a Hardware Interrupt Reaches a Handler on x86-64 The gate descriptor lookup, the privilege transition, and the stack switch that carry a device signal into kernel code, and what each step costs. operating systems
- Jan 20, 2024 Entering Long Mode From a Boot Loader The exact register sequence that turns on 64-bit addressing on x86-64, why paging must be enabled in the same instruction that commits to long mode, and the page tables that must exist beforehand. operating systems
- Sep 14, 2023 How a System Call Transfers Control to the Kernel What the x86-64 syscall instruction actually changes, why the kernel cannot switch stacks for free, and how the two return paths back to user mode differ. operating systems