How to remap Ctrl to Caps Lock in a TTY?

I already understand how to remap keys in an X graphical server. However, I sometimes like to do work from a TTY and cannot seem to figure out a way to functionally remap Ctrl to Caps Lock. I have already tried creating a .keymap file with the following contents:

keycode 37 = Control_L

Then sourcing it using loadkeys, but to no avail. However, 37 is the keycode for Ctrl in X (according to xmodmap -pke | grep 'Control') so perhaps the keycode is different in a TTY? If so, how would I go about determining the correct key code and subsequently setting the remap?