| | 1 | /* |
| | 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. |
| | 3 | * |
| | 4 | * @APPLE_LICENSE_HEADER_START@ |
| | 5 | * |
| | 6 | * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. |
| | 7 | * |
| | 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 |
| | 17 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| | 18 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
| | 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. |
| | 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_ */ |
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