X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/e3027f41d0120b4278cca462f397b6619dcd9ac5..2d21ac55c334faf3a56e5634905ed6987fc787d4:/iokit/IOKit/ppc/IOSharedLockImp.h diff --git a/iokit/IOKit/ppc/IOSharedLockImp.h b/iokit/IOKit/ppc/IOSharedLockImp.h index 030fd4913..8c685b223 100644 --- 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. * - * @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, - * 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. @@ -54,33 +60,6 @@ #include #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) @@ -93,20 +72,48 @@ #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) + +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 /* @@ -118,14 +125,19 @@ END(_ev_lock) */ LEAF(_ev_unlock) -LEAF(_IOSpinUnlock) sync li a7,0 stw a7,0(a0) - ENABLE_PREEMPTION() blr END(_ev_unlock) +LEAF(_IOSpinUnlock) + sync + li a7,0 + stw a7,0(a0) + blr +END(_IOSpinUnlock) + /* * ev_try_lock(p) @@ -135,25 +147,53 @@ END(_ev_unlock) */ 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) +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 */