• Slides

Download and unzip the tasks archive sesiune-07 on the virtual machine.

1. Interrrupts
   • Use the code in 1-irq/ to implement a simple keyboard logger.
   • TODO 1 - grab the interrupt line
     • in module initialization function request the interrupt line, use I8042_KBD_IRQ macro.
     • in module exit function release the irq line.
   • TODO 2 - implement the interrupt handler
     • interrupt handler must read keys pressed using i8042_read_data and print to kernel log only ASCII characters
   • TODO 3 - implement i8042_read_data function
     • this function should read and return the value stored in DATA register.
     • use inb family of functions
2. Tasklets, work queues, timers
   • Use 2-act/ directory to create and schedule the following kernel activities:
     • tasklet
       • declare a tasklet structure using: DECLARE_TASKLET
       • schedule tasklet to run using: tasklet_schedule
     • work queue
       • declare a work struct using: DECLARE_WORK
       • schedule work to run using: schedule_work
     • timer
       • setup a timer_list timer using: setup_timer
       • schedule a timer to run using: mod_timer
3. (bonus) implement a char device driver that stores in a buffer the keys typed in.
   • Implement the read syscall handler to read from userspace the buffer.
   • Implement the ioctl syscall to clear the buffer.