From 2bd5ffb4ebed973e24ccaf6f6df17ba1ce01dcdc Mon Sep 17 00:00:00 2001
From: Elfein Landers <patlymlatun@mgail.com>
Date: Sat, 6 Aug 2022 20:43:23 -0700
Subject: [PATCH] Documenting a bit in interrupts

---
 ableos/src/arch/x86_64/interrupts.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/ableos/src/arch/x86_64/interrupts.rs b/ableos/src/arch/x86_64/interrupts.rs
index 8388be2d..f18cd7aa 100644
--- a/ableos/src/arch/x86_64/interrupts.rs
+++ b/ableos/src/arch/x86_64/interrupts.rs
@@ -177,11 +177,17 @@ pub fn init_idt() {
     IDT.load();
 }
 
+/// https://wiki.osdev.org/Pit
+/// 
 const PIT_MAX_FREQ: u32 = 1193180;
 
 pub fn set_pit_frequency(pit: u16, freq: u32) {
+    // Dividing the maximum frequency by the desired frequency
+    // gives roughly what the maximum value for the timer
+    // counter should be to run at the desired frequency.
     let ret = (PIT_MAX_FREQ / freq).try_into();
 
+    // Type-bounded counter maximum.
     let divisor: u16 = match ret {
         Ok(div) => div,
         Err(err) => {