Here is a list of all documented files with brief descriptions:

[detail level 1234567]

kernel
include
arch
x86
amd64
gdt
gdt.h
idt
idt.h
io
io.h
boot
multiboot.h
i386
gdt
gdt.h
idt
idt.h
io
io.h
mmu
paging.h
physicalmemorymanager.h
virtualmemorymanager.h
pic
pic.h
pit
pit.h
rtc
rtc.h
syscall
syscall.h
tss
tss.h
kal.h
drivers
framebuffer.h
keyboard.h
vga.h
kernel
libk
panic.h
stdio.h
stdlib.h
string.h
mm
heap.h
slab.h
process
process.h
scheduler
scheduler.h
thread
thread.h
tty
font8x16.h
framebufferbackend.h
tty.h
ttybackend.h
vgabackend.h
src
kernel
scheduler
scheduler.c
tty
framebufferbackend.c
vgabackend.c
libc
include
sys
cdefs.h
float.h	Floating point constants
limits.h	Implementation-defined limit constants for freestanding environment
math.h	Math functions and constants
stdarg.h	Variable argument list macros
stdbool.h	Boolean type and constants
stddef.h	Common definitions for C programs
stdint.h	Fixed-width integer types
stdio.h	Standard I/0
stdlib.h
string.h