software commands related to pulse width modulator

reference to http://www.allaboutcircuits.com/projects/pulse-width-modulation-with-the-sam4s-xplained-pro/

hi pardon my ignorance…
are the following commands reserved or variables or specific commands?
are they in C?
i have tried looking the commands in Atmel saoftware frames(ASF) but found none of these.

if reserved where can i find more info?

IOPORT_CREATE_PIN()
pio_configure_pin()
pmc_enable_periph_clk()
pwm_init()
pmc_enable_periph_clk()

thanks in advance
stupid