What you'll learn

Interrupts and Bottom Halves

Requirements

Should be able to write/compile/load/unload Hello World Linux Kernel Modules

Description

What you will learn from this course

Interrupts and Exceptions

Types of Interrupts and Exceptions : Level Triggerred, Edge Triggerred, Traps, Faults

Programmable Interrput Controller, Advanced Programmable Interrupt Controller (APIC) - IO APIC, Local APIC

Find out information about your x86 CPU using CPUID Instruction

What happens when there is interrupt

How does CPU finds the interrupt handler: Interrupt Request, Interrupt Vector and Interrupt Descriptor Table

Interrupt Handling and Statistics in Linux Kernel : Interrupt sharing, return values, IRQ Affinity

Linux Driver for keyboard, mouse, ethernet interrupts

Write a Keylogger in Linux Kernel which will log all characters typed

Enabling/Disabling Interrupts

What happens when we add sleep and delay in interrupt handler

Top and Bottom Halves: Threaded IRQs,Softirqs, Tasklets and Workqueues (System Workqueues and own workqueues)

Differences between softirqs, tasklets and workqueues

Files

/proc/cpuinfo

/proc/interrupts

/proc/irq

/proc/softirqs

API's/Macros/Structures

request_irq, irq_handler_t

local_irq_enable, local_irq_disable, cli, sei

local_irq_save, local_irq_restore

disable_irq, enable_irq

disable_irq_nosync, synchronize_irq

irqs_disabled

in_interrupt

request_threaded_irq

struct softirq_action, NR_SOFTIRQS

open_softirq, raise_softirq

in_irq

local_softirq_pending

in_softirq

local_bh_enable, local_bh_disable

spin_lock_bh, spin_unlock_bh

struct tasklet_struct, DECLARE_TASKLET, DECLARE_TASKLET_DISABLED, tasklet_init, tasklet_schedule, tasklet_hi_schedule

tasklet_trylock, tasklet_unlock, tasklet_disable, tasklet_disable_nosync, tasklet_enable, tasklet_kill

struct workqueue_struct, struct work_struct, DECLARE_WORK, INIT_WORK, queue_work, queue_work_on, schedule_work, schedule_work_on, cancel_work_sync, flush_work

struct delayed_work, DELAYED_DECLARED_WORK, INIT_DELAYED_WORK, schedule_delayed_work, schedule_delayed_work_on, flush_delayed_work, cancel_delayed_work

alloc_workqueue, destroy_workqueue, flush_workqueue, alloc_ordered_workqueue,

Commands

watch

lspci

dmesg

Who this course is for:

Kernel developers curious about learning Interrupts and Bottom Halves



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