From b7f59b28b380d55f9e7abd8e450f1f9c7f050221 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Sat, 1 Aug 2020 20:55:53 +0200
Subject: Added syscalls

---
 src/inc/cpu.h | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src/inc/cpu.h')

diff --git a/src/inc/cpu.h b/src/inc/cpu.h
index b8897de..092fd3f 100644
--- a/src/inc/cpu.h
+++ b/src/inc/cpu.h
@@ -14,4 +14,12 @@ void outb(u16 port, u8 data);
 void outw(u16 port, u16 data);
 void outl(u16 port, u32 data);
 
+static inline void spinlock(int *ptr)
+{
+	int prev;
+	do
+		__asm__ volatile("lock xchgl %0,%1" : "=a"(prev) : "m"(*ptr), "a"(1));
+	while (prev);
+}
+
 #endif
-- 
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