1 files changed, 30 insertions, 0 deletions
diff --git a/arch/i386/kernel/spinlock.s b/arch/i386/kernel/spinlock.s
new file mode 100644
index 0000000..c8235ca
--- /dev/null
+++ b/arch/i386/kernel/spinlock.s
@@ -0,0 +1,30 @@
+.section .text
+
+.global aquire_lock
+.type aquire_lock, @function
+aquire_lock:
+        pushl %ebp
+        movl %esp, %ebp
+locked:
+        movl 8(%esp), %eax
+        lock incl (%eax)
+        jc spin_wait
+
+        popl %ebp
+        ret
+spin_wait:
+        test %eax, 1
+        jnz spin_wait
+        jmp locked
+
+.global release_lock
+.type release_lock, @function
+release_lock:
+        pushl %ebp
+        movl %esp, %ebp
+
+        movl 8(%ebp), %eax
+        lock decl (%eax)
+
+        popl %ebp
+        ret