Linux Device Drivers (3rd) - Study Notes
Chapter 9/10 "Short"
# hardware interrupts and installed handlers.
cat /proc/interrupts
cat /proc/stat
Methold 1:
=======
# install modules
insmod short.ko
lsmod | grep short
# create device node
# <250> is the major NO. which output from the 1st command
cat /proc/devices | grep short
mknod /dev/short0 c 250 0
mknod /dev/short1 c 250 1
ls /dev/ | grep short
# verify
echo -n "any string" > /dev/short0
Methold 2:
=======
# install/remove modules by using scripts
./short_load
./short_unload
Linux space & context
In fact, in Linux, we can generalize that each processor is doing one of three things at any given moment:
-
In kernel-space, in process context, executing on behalf of a specific process
-
In kernel-space, in interrupt context, not associated with a process, handling an interrupt
-
In user-space, executing user code in a process
