From c0065bc89351c9d63e6c34ef5fbadc8a3d7bffc7 Mon Sep 17 00:00:00 2001
From: bjorn3 <17426603+bjorn3@users.noreply.github.com>
Date: Mon, 30 Mar 2026 19:22:06 +0200
Subject: [PATCH] rmm: Add some comments to init_pat

---
 rmm/src/arch/x86_shared.rs | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/rmm/src/arch/x86_shared.rs b/rmm/src/arch/x86_shared.rs
index 086afdf9fd..66e760657f 100644
--- a/rmm/src/arch/x86_shared.rs
+++ b/rmm/src/arch/x86_shared.rs
@@ -12,12 +12,12 @@ bitflags::bitflags! {
 #[inline(always)]
 pub unsafe fn init_pat() {
     unsafe {
-        let uncacheable = 0;
-        let write_combining = 1;
-        let write_through = 4;
-        //let write_protected = 5;
-        let write_back = 6;
-        let uncached = 7;
+        let uncacheable = 0; // UC
+        let write_combining = 1; // WC
+        let write_through = 4; // WT
+        let _write_protected = 5; // WP
+        let write_back = 6; // WB
+        let uncached = 7; // UC- (overridable by WC MTRR)
 
         let pat0 = write_back;
         let pat1 = write_through;