# SYSTEM
mret      11..7=0 19..15=0 31..20=0x302 14..12=0 6..2=0x1C 1..0=3
dret      11..7=0 19..15=0 31..20=0x7b2 14..12=0 6..2=0x1C 1..0=3
wfi       11..7=0 19..15=0 31..20=0x105 14..12=0 6..2=0x1C 1..0=3

