From 0674da032568d1fa62040471b6effcef52e96d98 Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Thu, 23 Nov 2023 15:41:24 -0500
Subject: [PATCH] Flip IRQ priority.

---
 Machines/PCCompatible/PIC.hpp | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/Machines/PCCompatible/PIC.hpp b/Machines/PCCompatible/PIC.hpp
index c89d4a157..513129869 100644
--- a/Machines/PCCompatible/PIC.hpp
+++ b/Machines/PCCompatible/PIC.hpp
@@ -114,13 +114,11 @@ class PIC {
 		int acknowledge() {
 			awaiting_eoi_ = true;
 
-			// TODO: there's bound to be a better solution than this search?
-			// TODO: is this the right priority order?
-			in_service_ = 0x80;
-			int id = 7;
-			while(!(in_service_ & requests_)) {
-				in_service_ >>= 1;
-				--id;
+			in_service_ = 0x01;
+			int id = 0;
+			while(!(in_service_ & requests_) && in_service_) {
+				in_service_ <<= 1;
+				++id;
 			}
 
 			if(in_service_) {