2 files changed, 16 insertions, 0 deletions
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
diff --git a/src/inc/syscall.h b/src/inc/syscall.h
new file mode 100644
index 0000000..b0de099
--- /dev/null
+++ b/src/inc/syscall.h
@@ -0,0 +1,8 @@
+// MIT License, Copyright (c) 2020 Marvin Borner
+
+#ifndef SYSCALL_H
+#define SYSCALL_H
+
+void syscall_install();
+
+#endif