From 9bc94963aefcb5028c3529ff59c974e48d814690 Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Thu, 23 Dec 2021 21:42:32 -0800
Subject: Intro USB

---
 src/cpu/atomic/swap.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/cpu/atomic')

diff --git a/src/cpu/atomic/swap.h b/src/cpu/atomic/swap.h
index 5e8ff57..374dd97 100644
--- a/src/cpu/atomic/swap.h
+++ b/src/cpu/atomic/swap.h
@@ -6,6 +6,7 @@
 /// https://elixir.bootlin.com/linux/v4.9/source/arch/arm/include/asm/spinlock.h
 /// https://elixir.bootlin.com/linux/v4.9/source/arch/arm/include/asm/spinlock_types.h#L23
 /// https://www.cs.uic.edu/~jbell/CourseNotes/OperatingSystems/3_Processes.html
+/// https://developer.arm.com/documentation/dht0008/a/arm-synchronization-primitives/practical-uses/implementing-a-semaphore?lang=en
 
 static inline void atm_lock(unsigned long pid, unsigned long* addr) {
 	unsigned long tmp, current_lock_value;
-- 
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