projects / apple / xnu.git / blame
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|---|---|---|
| 1c79356b A |
1 | /* |
| 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| d7e50217 | 6 | * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. |
| 1c79356b | 7 | * |
| d7e50217 A |
8 | * This file contains Original Code and/or Modifications of Original Code |
| 9 | * as defined in and that are subject to the Apple Public Source License | |
| 10 | * Version 2.0 (the 'License'). You may not use this file except in | |
| 11 | * compliance with the License. Please obtain a copy of the License at | |
| 12 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 13 | * file. | |
| 14 | * | |
| 15 | * The Original Code and all software distributed under the License are | |
| 16 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 1c79356b A |
17 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 18 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| d7e50217 A |
19 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| 20 | * Please see the License for the specific language governing rights and | |
| 21 | * limitations under the License. | |
| 1c79356b A |
22 | * |
| 23 | * @APPLE_LICENSE_HEADER_END@ | |
| 24 | */ | |
| 25 | /* | |
| 26 | * @OSF_COPYRIGHT@ | |
| 27 | * | |
| 28 | */ | |
| 29 | /* | |
| 30 | * HISTORY | |
| 31 | * | |
| 32 | * Revision 1.1.1.1 1998/09/22 21:05:31 wsanchez | |
| 33 | * Import of Mac OS X kernel (~semeria) | |
| 34 | * | |
| 35 | * Revision 1.1.1.1 1998/03/07 02:25:47 wsanchez | |
| 36 | * Import of OSF Mach kernel (~mburg) | |
| 37 | * | |
| 38 | * Revision 1.1.5.1 1995/06/13 18:20:42 sjs | |
| 39 | * Merge from flipc_shared. | |
| 40 | * [95/06/07 sjs] | |
| 41 | * | |
| 42 | * Revision 1.1.3.3 1995/02/21 17:23:16 randys | |
| 43 | * Re-indented code to four space indentation | |
| 44 | * [1995/02/21 16:26:50 randys] | |
| 45 | * | |
| 46 | * Revision 1.1.3.2 1994/12/20 19:02:12 randys | |
| 47 | * Moved definition of flipc_simple_lock to flipc_cb.h | |
| 48 | * [1994/12/20 17:35:15 randys] | |
| 49 | * | |
| 50 | * Moved the machine independent macros into mach/flipc_locks.h | |
| 51 | * [1994/12/20 16:44:14 randys] | |
| 52 | * | |
| 53 | * Added filename in comment at top of file | |
| 54 | * [1994/12/19 20:29:36 randys] | |
| 55 | * | |
| 56 | * Fixed incorrect return of lock_try | |
| 57 | * [1994/12/13 00:36:46 randys] | |
| 58 | * | |
| 59 | * Revision 1.1.3.1 1994/12/12 17:46:29 randys | |
| 60 | * Putting initial flipc implementation under flipc_shared | |
| 61 | * [1994/12/12 16:27:51 randys] | |
| 62 | * | |
| 63 | * Revision 1.1.1.2 1994/12/11 23:08:36 randys | |
| 64 | * Initial flipc code checkin. | |
| 65 | * | |
| 66 | * $EndLog$ | |
| 67 | */ | |
| 68 | ||
| 69 | /* | |
| 70 | * mach/i386/flipc_dep.h | |
| 71 | * | |
| 72 | * This file will have all of the FLIPC implementation machine dependent | |
| 73 | * defines that need to be visible to both kernel and AIL (eg. bus locks | |
| 74 | * and bus synchronization primitives). | |
| 75 | */ | |
| 76 | ||
| 77 | #ifndef _MACH_FLIPC_DEP_H_ | |
| 78 | #define _MACH_FLIPC_DEP_H_ | |
| 79 | ||
| 80 | /* For the 386, we don't need to wrap synchronization variable writes | |
| 81 | at all. */ | |
| 82 | #define SYNCVAR_WRITE(statement) statement | |
| 83 | ||
| 84 | /* And similarly (I believe; check on this), for the 386 there isn't any | |
| 85 | requirement for write fences. */ | |
| 86 | #define WRITE_FENCE() | |
| 87 | ||
| 88 | /* | |
| 89 | * Flipc simple lock defines. These are almost completely for the use | |
| 90 | * of the AIL; the reason they are in this file is that they need to | |
| 91 | * be initialized properly in the communications buffer initialization | |
| 92 | * routine. Sigh. Note in particular that the kernel has no defined | |
| 93 | * "simple_lock_yield_function", so it had better never expand the | |
| 94 | * macro simple_lock_acquire. | |
| 95 | * | |
| 96 | * These locks may be declared by "flipc_simple_lock lock;". If they | |
| 97 | * are instead declared by FLIPC_DECL_SIMPLE_LOCK(class,lockname) they | |
| 98 | * may be used without initialization. | |
| 99 | */ | |
| 100 | ||
| 101 | #define SIMPLE_LOCK_INITIALIZER 0 | |
| 102 | #define FLIPC_DECL_SIMPLE_LOCK(class,lockname) \ | |
| 103 | class flipc_simple_lock (lockname) = SIMPLE_LOCK_INITIALIZER | |
| 104 | ||
| 105 | /* | |
| 106 | * Lower case because they may be macros or functions. | |
| 107 | * I'll include the function prototypes just for examples here. | |
| 108 | */ | |
| 109 | ||
| 110 | #define flipc_simple_lock_init(lock) \ | |
| 111 | do { \ | |
| 112 | *(lock) = SIMPLE_LOCK_INITIALIZER; \ | |
| 113 | } while (0) | |
| 114 | ||
| 115 | /* | |
| 116 | * Defines of the actual routines, for gcc. | |
| 117 | */ | |
| 118 | ||
| 119 | #define flipc_simple_lock_locked(lock) ((*lock) != SIMPLE_LOCK_INITIALIZER) | |
| 120 | ||
| 121 | #ifdef __GNUC__ | |
| 122 | extern __inline__ int flipc_simple_lock_try(flipc_simple_lock *lock) | |
| 123 | { | |
| 124 | int r; | |
| 125 | __asm__ volatile("movl $1, %0; xchgl %0, %1" : "=&r" (r), "=m" (*lock)); | |
| 126 | return !r; | |
| 127 | } | |
| 128 | ||
| 129 | /* I don't know why this requires an ASM, but I'll follow the leader. */ | |
| 130 | extern __inline__ void flipc_simple_lock_release(flipc_simple_lock *lock) | |
| 131 | { | |
| 132 | register int t; | |
| 133 | ||
| 134 | __asm__ volatile("xorl %0, %0; xchgl %0, %1" : "=&r" (t), "=m" (*lock)); | |
| 135 | } | |
| 136 | #else /* __GNUC__ */ | |
| 137 | /* If we aren't compiling with gcc, the above need to be functions. */ | |
| 138 | #endif /* __GNUC__ */ | |
| 139 | ||
| 140 | #endif /* _MACH_FLIPC_DEP_H_ */ |