osdev-interrupts

What problem does it solve?

Provides a concise, practical reference and patterns for implementing interrupt controllers, ISR stubs, IRQ remapping, and CPU exception handling in bare-metal x86 and x86-64 kernels so developers avoid common pitfalls that cause double or triple faults and unpredictable behavior.

Core Features & Use Cases

• PIC 8259 remapping and masking patterns to move hardware IRQs away from CPU exception vectors.
• Local APIC and IO-APIC setup, MMIO mapping guidance, EOI and timer configuration, and inter-processor interrupt (IPI) details.
• ISR stub conventions that normalize error-code handling and full CPU register save/restore, plus exception diagnostics for page faults and double faults.
• Use case: implement a kernel's IDT and handlers to reliably handle timer, keyboard, and page fault events on both uniprocessor and SMP systems.

Quick Start

Use the osdev-interrupts skill to outline the steps and code patterns to remap the PIC to vectors 0x20-0x2F, enable the local APIC with a spurious vector, and create uniform ISR stubs for exceptions and hardware IRQs.