xnu-1699.22.81.tar.gz

[apple/xnu.git] / iokit / Kernel / i386 / IOSharedLock.s

diff --git a/iokit/Kernel/i386/IOSharedLock.s b/iokit/Kernel/i386/IOSharedLock.s
index 58b50f4def1b26fbdad24e2478a89559960a2397..9360dce09401bdddad298f8f6a810623ad9fd258 100644 (file)
--- a/iokit/Kernel/i386/IOSharedLock.s
+++ b/iokit/Kernel/i386/IOSharedLock.s
@@ -1,10 +1,8 @@
 /*
- * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 1998-2010 Apple Computer, Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
  * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
- * 
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in
@@ -22,5 +20,45 @@
  * 
  * @APPLE_LICENSE_HEADER_END@
  */
-#include <IOKit/machine/IOSharedLockImp.h>
 
+#include <architecture/i386/asm_help.h>
+
+       TEXT
+
+/*
+ * void
+ * OSSpinLockUnlock(p)
+ *     int *p;
+ *
+ * Unlock the lock pointed to by p.
+ */
+
+LEAF(_OSSpinLockUnlock, 0)
+LEAF(_IOSpinUnlock, 0)
+LEAF(_ev_unlock, 0)
+       movl            4(%esp), %ecx
+       movl            $0, (%ecx)
+END(_OSSpinLockUnlock)
+
+
+/*
+ * int
+ * OSSpinLockTry(p)
+ *     int *p;
+ *
+ * Try to lock p.  Return zero if not successful.
+ */
+
+LEAF(_OSSpinLockTry, 0)
+LEAF(_IOTrySpinLock, 0)
+LEAF(_ev_try_lock, 0)
+        movl            4(%esp), %ecx 
+       xorl            %eax, %eax
+        lock
+        cmpxchgl        %ecx, (%ecx)
+       jne     1f
+       movl    $1, %eax                /* yes */
+       ret
+1:
+       xorl    %eax, %eax              /* no */
+END(_OSSpinLockTry)