/*
* Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
- *
- * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* 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. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * 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.
+ *
+ * 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
* Please see the License for the specific language governing rights and
* limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <sys/appleapiopts.h>
.text
.align 2
- .globl EXT(spinlock_32_try_mp)
- .globl EXT(spinlock_32_try_up)
- .globl EXT(spinlock_32_lock_mp)
- .globl EXT(spinlock_32_lock_up)
- .globl EXT(spinlock_32_unlock_mp)
- .globl EXT(spinlock_32_unlock_up)
-
- .globl EXT(spinlock_64_try_mp)
- .globl EXT(spinlock_64_try_up)
- .globl EXT(spinlock_64_lock_mp)
- .globl EXT(spinlock_64_lock_up)
- .globl EXT(spinlock_64_unlock_mp)
- .globl EXT(spinlock_64_unlock_up)
-
- .globl EXT(spinlock_relinquish)
#define MP_SPIN_TRIES 1000
-// The user mode spinlock library. There are many versions,
-// in order to take advantage of a few special cases:
-// - no barrier instructions (SYNC,ISYNC) are needed if UP
-// - 64-bit processors can use LWSYNC instead of SYNC (if MP)
-// - branch hints appropriate to the processor (+ vs ++ etc)
-// - potentially custom relinquish strategies (not used at present)
-// - fixes for errata as necessary
+/* The user mode spinlock library. There are many versions,
+ * in order to take advantage of a few special cases:
+ * - no barrier instructions (SYNC,ISYNC) are needed if UP
+ * - 64-bit processors can use LWSYNC instead of SYNC (if MP)
+ * - 32-bit processors can use ISYNC/EIEIO instead of SYNC (if MP)
+ * - branch hints appropriate to the processor (+ vs ++ etc)
+ * - potentially custom relinquish strategies (not used at present)
+ * - fixes for errata as necessary
+ *
+ * The convention for lockwords is that 0==free and -1==locked.
+ */
spinlock_32_try_mp:
- mr r5, r3
- li r3, 1
+ mr r5, r3
+ li r3, 1
1:
lwarx r4,0,r5
+ li r6,-1 // locked == -1
cmpwi r4,0
bne- 2f
- stwcx. r5,0,r5
+ stwcx. r6,0,r5
isync // cancel speculative execution
beqlr+
b 1b
2:
- li r3,0
+ li r3,0 // we did not get the lock
blr
- COMMPAGE_DESCRIPTOR(spinlock_32_try_mp,_COMM_PAGE_SPINLOCK_TRY,0,k64Bit+kUP,0)
+ COMMPAGE_DESCRIPTOR(spinlock_32_try_mp,_COMM_PAGE_SPINLOCK_TRY,0,k64Bit+kUP,kCommPage32)
spinlock_32_try_up:
- mr r5, r3
- li r3, 1
+ mr r5, r3
+ li r3, 1
1:
lwarx r4,0,r5
+ li r6,-1 // locked == -1
cmpwi r4,0
bne- 2f
- stwcx. r5,0,r5
+ stwcx. r6,0,r5
beqlr+
b 1b
2:
- li r3,0
+ li r3,0 // we did not get the lock
blr
- COMMPAGE_DESCRIPTOR(spinlock_32_try_up,_COMM_PAGE_SPINLOCK_TRY,kUP,k64Bit,0)
+ COMMPAGE_DESCRIPTOR(spinlock_32_try_up,_COMM_PAGE_SPINLOCK_TRY,kUP,k64Bit,kCommPage32)
spinlock_32_lock_mp:
li r5,MP_SPIN_TRIES
1:
lwarx r4,0,r3
+ li r6,-1 // locked == -1
cmpwi r4,0
bne- 2f
- stwcx. r3,0,r3
+ stwcx. r6,0,r3
isync // cancel speculative execution
beqlr+ // we return void
b 1b
bne 1b
ba _COMM_PAGE_RELINQUISH
- COMMPAGE_DESCRIPTOR(spinlock_32_lock_mp,_COMM_PAGE_SPINLOCK_LOCK,0,k64Bit+kUP,0)
+ COMMPAGE_DESCRIPTOR(spinlock_32_lock_mp,_COMM_PAGE_SPINLOCK_LOCK,0,k64Bit+kUP,kCommPage32)
spinlock_32_lock_up:
1:
lwarx r4,0,r3
+ li r6,-1 // locked == -1
cmpwi r4,0
bnea- _COMM_PAGE_RELINQUISH // always depress on UP (let lock owner run)
- stwcx. r3,0,r3
+ stwcx. r6,0,r3
beqlr+ // we return void
b 1b
- COMMPAGE_DESCRIPTOR(spinlock_32_lock_up,_COMM_PAGE_SPINLOCK_LOCK,kUP,k64Bit,0)
+ COMMPAGE_DESCRIPTOR(spinlock_32_lock_up,_COMM_PAGE_SPINLOCK_LOCK,kUP,k64Bit,kCommPage32)
spinlock_32_unlock_mp:
li r4,0
- sync // complete prior stores before unlock
+ isync // complete prior stores before unlock
+ eieio // (using isync/eieio is faster than a sync)
stw r4,0(r3)
blr
- COMMPAGE_DESCRIPTOR(spinlock_32_unlock_mp,_COMM_PAGE_SPINLOCK_UNLOCK,0,k64Bit+kUP,0)
+ COMMPAGE_DESCRIPTOR(spinlock_32_unlock_mp,_COMM_PAGE_SPINLOCK_UNLOCK,0,k64Bit+kUP,kCommPage32)
spinlock_32_unlock_up:
stw r4,0(r3)
blr
- COMMPAGE_DESCRIPTOR(spinlock_32_unlock_up,_COMM_PAGE_SPINLOCK_UNLOCK,kUP,k64Bit,0)
+ COMMPAGE_DESCRIPTOR(spinlock_32_unlock_up,_COMM_PAGE_SPINLOCK_UNLOCK,kUP,k64Bit,kCommPage32)
spinlock_64_try_mp:
- mr r5, r3
- li r3, 1
+ mr r5, r3
+ li r3, 1
1:
lwarx r4,0,r5
+ li r6,-1 // locked == -1
cmpwi r4,0
bne-- 2f
- stwcx. r5,0,r5
+ stwcx. r6,0,r5
isync // cancel speculative execution
beqlr++
b 1b
2:
li r6,-4
stwcx. r5,r6,r1 // clear the pending reservation (using red zone)
- li r3,0 // Pass failure
+ li r3,0 // we did not get the lock
blr
- COMMPAGE_DESCRIPTOR(spinlock_64_try_mp,_COMM_PAGE_SPINLOCK_TRY,k64Bit,kUP,0)
+ COMMPAGE_DESCRIPTOR(spinlock_64_try_mp,_COMM_PAGE_SPINLOCK_TRY,k64Bit,kUP,kCommPageBoth)
spinlock_64_try_up:
- mr r5, r3
- li r3, 1
+ mr r5, r3
+ li r3, 1
1:
lwarx r4,0,r5
+ li r6,-1 // locked == -1
cmpwi r4,0
bne-- 2f
- stwcx. r5,0,r5
+ stwcx. r6,0,r5
beqlr++
b 1b
2:
li r6,-4
stwcx. r5,r6,r1 // clear the pending reservation (using red zone)
- li r3,0
+ li r3,0 // we did not get the lock
blr
- COMMPAGE_DESCRIPTOR(spinlock_64_try_up,_COMM_PAGE_SPINLOCK_TRY,k64Bit+kUP,0,0)
+ COMMPAGE_DESCRIPTOR(spinlock_64_try_up,_COMM_PAGE_SPINLOCK_TRY,k64Bit+kUP,0,kCommPageBoth)
spinlock_64_lock_mp:
li r5,MP_SPIN_TRIES
1:
lwarx r4,0,r3
+ li r6,-1 // locked == -1
cmpwi r4,0
bne-- 2f
- stwcx. r3,0,r3
+ stwcx. r6,0,r3
isync // cancel speculative execution
beqlr++ // we return void
b 1b
bne-- 1b // mispredict this one (a cheap back-off)
ba _COMM_PAGE_RELINQUISH
- COMMPAGE_DESCRIPTOR(spinlock_64_lock_mp,_COMM_PAGE_SPINLOCK_LOCK,k64Bit,kUP,0)
+ COMMPAGE_DESCRIPTOR(spinlock_64_lock_mp,_COMM_PAGE_SPINLOCK_LOCK,k64Bit,kUP,kCommPageBoth)
spinlock_64_lock_up:
1:
lwarx r4,0,r3
+ li r6,-1 // locked == -1
cmpwi r4,0
bne-- 2f
- stwcx. r3,0,r3
+ stwcx. r6,0,r3
beqlr++ // we return void
b 1b
2: // always relinquish on UP (let lock owner run)
stwcx. r3,r6,r1 // clear the pending reservation (using red zone)
ba _COMM_PAGE_RELINQUISH
- COMMPAGE_DESCRIPTOR(spinlock_64_lock_up,_COMM_PAGE_SPINLOCK_LOCK,k64Bit+kUP,0,0)
+ COMMPAGE_DESCRIPTOR(spinlock_64_lock_up,_COMM_PAGE_SPINLOCK_LOCK,k64Bit+kUP,0,kCommPageBoth)
spinlock_64_unlock_mp:
- li r4,0
lwsync // complete prior stores before unlock
+ li r4,0
stw r4,0(r3)
blr
- COMMPAGE_DESCRIPTOR(spinlock_64_unlock_mp,_COMM_PAGE_SPINLOCK_UNLOCK,k64Bit,kUP,0)
+ COMMPAGE_DESCRIPTOR(spinlock_64_unlock_mp,_COMM_PAGE_SPINLOCK_UNLOCK,k64Bit,kUP,kCommPageBoth)
spinlock_64_unlock_up:
stw r4,0(r3)
blr
- COMMPAGE_DESCRIPTOR(spinlock_64_unlock_up,_COMM_PAGE_SPINLOCK_UNLOCK,k64Bit+kUP,0,0)
+ COMMPAGE_DESCRIPTOR(spinlock_64_unlock_up,_COMM_PAGE_SPINLOCK_UNLOCK,k64Bit+kUP,0,kCommPageBoth)
spinlock_relinquish:
mr r3,r12
ba _COMM_PAGE_SPINLOCK_LOCK
- COMMPAGE_DESCRIPTOR(spinlock_relinquish,_COMM_PAGE_RELINQUISH,0,0,0)
+ COMMPAGE_DESCRIPTOR(spinlock_relinquish,_COMM_PAGE_RELINQUISH,0,0,kCommPageBoth)
projects / apple / xnu.git / blobdiff