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[apple/xnu.git] / iokit / IOKit / ppc / IOSharedLockImp.h
diff --git a/iokit/IOKit/ppc/IOSharedLockImp.h b/iokit/IOKit/ppc/IOSharedLockImp.h
index 030fd4913e5a095f92e3b84d52f4aac76aef216e..8c685b2230170df7493809e50fee74d3c8a32c59 100644 (file)
--- a/iokit/IOKit/ppc/IOSharedLockImp.h
+++ b/iokit/IOKit/ppc/IOSharedLockImp.h
@@ -1,23 +1,29 @@
 /*
  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
  *
 /*
  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
  * 
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * 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
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
  * 
  * 
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
  * 
  * 
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 /*
  * Copyright (c) 1998 Apple Computer, Inc.  All rights reserved. 
  */
 /*
  * Copyright (c) 1998 Apple Computer, Inc.  All rights reserved. 
@@ -54,33 +60,6 @@
 #include <mach/ppc/asm.h>
 #endif
 
 #include <mach/ppc/asm.h>
 #endif
 
-.macro DISABLE_PREEMPTION
-#ifdef KERNEL
-       stwu    r1,-(FM_SIZE)(r1)
-       mflr    r0
-       stw             r3,FM_ARG0(r1)
-       stw             r0,(FM_SIZE+FM_LR_SAVE)(r1)
-       bl              EXT(_disable_preemption)
-       lwz             r3,FM_ARG0(r1)
-       lwz             r1,0(r1)
-       lwz             r0,FM_LR_SAVE(r1)
-       mtlr    r0
-#endif
-.endmacro
-.macro ENABLE_PREEMPTION
-#ifdef KERNEL
-       stwu    r1,-(FM_SIZE)(r1)
-       mflr    r0
-       stw             r3,FM_ARG0(r1)
-       stw             r0,(FM_SIZE+FM_LR_SAVE)(r1)
-       bl              EXT(_enable_preemption)
-       lwz             r3,FM_ARG0(r1)
-       lwz             r1,0(r1)
-       lwz             r0,FM_LR_SAVE(r1)
-       mtlr    r0
-#endif
-.endmacro
-
 /*
  *     void
  *     ev_lock(p)
 /*
  *     void
  *     ev_lock(p)
@@ -93,20 +72,48 @@
 
 #ifndef KERNEL
 LEAF(_ev_lock)
 
 #ifndef KERNEL
 LEAF(_ev_lock)
-LEAF(_IOSpinLock)
-       li      a6,1            // lock value
-       lwarx   a7,0,a0         // CEMV10
-9:
-       sync
-       lwarx   a7,0,a0         // read the lock
-       cmpwi   cr0,a7,0        // is it busy?
-       bne-    9b              // yes, spin
-       sync
-       stwcx.  a6,0,a0         // try to get the lock
-       bne-    9b              // failed, try again
-       isync
-       blr                     // got it, return
+
+               li              a6,1                    // lock value
+               
+8:             lwz             a7,0(a0)                // Get lock word
+               mr.             a7,a7                   // Is it held?
+               bne--   8b                              // Yup...
+
+9:             lwarx   a7,0,a0                 // read the lock
+               mr.             a7,a7                   // Is it held?
+               bne--   7f                              // yes, kill reservation
+               stwcx.  a6,0,a0                 // try to get the lock
+               bne--   9b                              // failed, try again
+               isync
+               blr                                             // got it, return
+               
+7:             li              a7,-4                   // Point to a spot in the red zone
+               stwcx.  a7,a7,r1                // Kill reservation
+               b               8b                              // Go wait some more...
+               
+               
 END(_ev_lock)
 END(_ev_lock)
+
+LEAF(_IOSpinLock)
+
+               li              a6,1                    // lock value
+               
+8:             lwz             a7,0(a0)                // Get lock word
+               mr.             a7,a7                   // Is it held?
+               bne--   8b                              // Yup...
+
+9:             lwarx   a7,0,a0                 // read the lock
+               mr.             a7,a7                   // Is it held?
+               bne--   7f                              // yes, kill reservation
+               stwcx.  a6,0,a0                 // try to get the lock
+               bne--   9b                              // failed, try again
+               isync
+               blr                                             // got it, return
+               
+7:             li              a7,-4                   // Point to a spot in the red zone
+               stwcx.  a7,a7,r1                // Kill reservation
+               b               8b                              // Go wait some more...
+END(_IOSpinLock)
 #endif
 
 /*
 #endif
 
 /*
@@ -118,14 +125,19 @@ END(_ev_lock)
  */
 
 LEAF(_ev_unlock)
  */
 
 LEAF(_ev_unlock)
-LEAF(_IOSpinUnlock)
        sync
        li      a7,0
        stw     a7,0(a0)
        sync
        li      a7,0
        stw     a7,0(a0)
-       ENABLE_PREEMPTION()
        blr
 END(_ev_unlock)
 
        blr
 END(_ev_unlock)
 
+LEAF(_IOSpinUnlock)
+       sync
+       li      a7,0
+       stw     a7,0(a0)
+       blr
+END(_IOSpinUnlock)
+
 
 /*
  *     ev_try_lock(p)
 
 /*
  *     ev_try_lock(p)
@@ -135,25 +147,53 @@ END(_ev_unlock)
  */
 
 LEAF(_ev_try_lock)
  */
 
 LEAF(_ev_try_lock)
-LEAF(_IOTrySpinLock)
-       li      a6,1            // lock value
-        DISABLE_PREEMPTION()
-       lwarx   a7,0,a0         // CEMV10
-8:
-       sync
-       lwarx   a7,0,a0         // read the lock
-       cmpwi   cr0,a7,0        // is it busy?
-       bne-    9f              // yes, give up
-       sync
-       stwcx.  a6,0,a0         // try to get the lock
-       bne-    8b              // failed, try again
-       li      a0,1            // return TRUE
-       isync
-       blr
-9:
-       ENABLE_PREEMPTION()
-       li      a0,0            // return FALSE
-       blr
+               li              a6,1                    // lock value
+               
+               lwz             a7,0(a0)                // Get lock word
+               mr.             a7,a7                   // Is it held?
+               bne--   6f                              // Yup...
+
+9:             lwarx   a7,0,a0                 // read the lock
+               mr.             a7,a7                   // Is it held?
+               bne--   7f                              // yes, kill reservation
+               stwcx.  a6,0,a0                 // try to get the lock
+               bne--   9b                              // failed, try again
+               li              a0,1                    // return TRUE
+               isync
+               blr                                             // got it, return
+               
+7:             li              a7,-4                   // Point to a spot in the red zone
+               stwcx.  a7,a7,r1                // Kill reservation
+
+6:
+               li      a0,0                            // return FALSE
+               blr
+               
 END(_ev_try_lock)
 
 END(_ev_try_lock)
 
+LEAF(_IOTrySpinLock)
+               li              a6,1                    // lock value
+               
+               lwz             a7,0(a0)                // Get lock word
+               mr.             a7,a7                   // Is it held?
+               bne--   6f                              // Yup...
+
+9:             lwarx   a7,0,a0                 // read the lock
+               mr.             a7,a7                   // Is it held?
+               bne--   7f                              // yes, kill reservation
+               stwcx.  a6,0,a0                 // try to get the lock
+               bne--   9b                              // failed, try again
+               li              a0,1                    // return TRUE
+               isync
+               blr                                             // got it, return
+               
+7:             li              a7,-4                   // Point to a spot in the red zone
+               stwcx.  a7,a7,r1                // Kill reservation
+
+6:
+               li      a0,0                            // return FALSE
+               blr
+               
+END(_IOTrySpinLock)
+
 #endif /* ! _IOKIT_IOSHAREDLOCKIMP_H */
 #endif /* ! _IOKIT_IOSHAREDLOCKIMP_H */
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