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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /*
23: * @OSF_COPYRIGHT@
24: *
25: */
26: /*
27: * HISTORY
28: *
29: * Revision 1.1.1.1 1998/09/22 21:05:31 wsanchez
30: * Import of Mac OS X kernel (~semeria)
31: *
32: * Revision 1.1.1.1 1998/03/07 02:25:47 wsanchez
33: * Import of OSF Mach kernel (~mburg)
34: *
35: * Revision 1.1.5.1 1995/06/13 18:20:42 sjs
36: * Merge from flipc_shared.
37: * [95/06/07 sjs]
38: *
39: * Revision 1.1.3.3 1995/02/21 17:23:16 randys
40: * Re-indented code to four space indentation
41: * [1995/02/21 16:26:50 randys]
42: *
43: * Revision 1.1.3.2 1994/12/20 19:02:12 randys
44: * Moved definition of flipc_simple_lock to flipc_cb.h
45: * [1994/12/20 17:35:15 randys]
46: *
47: * Moved the machine independent macros into mach/flipc_locks.h
48: * [1994/12/20 16:44:14 randys]
49: *
50: * Added filename in comment at top of file
51: * [1994/12/19 20:29:36 randys]
52: *
53: * Fixed incorrect return of lock_try
54: * [1994/12/13 00:36:46 randys]
55: *
56: * Revision 1.1.3.1 1994/12/12 17:46:29 randys
57: * Putting initial flipc implementation under flipc_shared
58: * [1994/12/12 16:27:51 randys]
59: *
60: * Revision 1.1.1.2 1994/12/11 23:08:36 randys
61: * Initial flipc code checkin.
62: *
63: * $EndLog$
64: */
65:
66: /*
67: * mach/i386/flipc_dep.h
68: *
69: * This file will have all of the FLIPC implementation machine dependent
70: * defines that need to be visible to both kernel and AIL (eg. bus locks
71: * and bus synchronization primitives).
72: */
73:
74: #ifndef _MACH_FLIPC_DEP_H_
75: #define _MACH_FLIPC_DEP_H_
76:
77: /* For the 386, we don't need to wrap synchronization variable writes
78: at all. */
79: #define SYNCVAR_WRITE(statement) statement
80:
81: /* And similarly (I believe; check on this), for the 386 there isn't any
82: requirement for write fences. */
83: #define WRITE_FENCE()
84:
85: /*
86: * Flipc simple lock defines. These are almost completely for the use
87: * of the AIL; the reason they are in this file is that they need to
88: * be initialized properly in the communications buffer initialization
89: * routine. Sigh. Note in particular that the kernel has no defined
90: * "simple_lock_yield_function", so it had better never expand the
91: * macro simple_lock_acquire.
92: *
93: * These locks may be declared by "flipc_simple_lock lock;". If they
94: * are instead declared by FLIPC_DECL_SIMPLE_LOCK(class,lockname) they
95: * may be used without initialization.
96: */
97:
98: #define SIMPLE_LOCK_INITIALIZER 0
99: #define FLIPC_DECL_SIMPLE_LOCK(class,lockname) \
100: class flipc_simple_lock (lockname) = SIMPLE_LOCK_INITIALIZER
101:
102: /*
103: * Lower case because they may be macros or functions.
104: * I'll include the function prototypes just for examples here.
105: */
106:
107: #define flipc_simple_lock_init(lock) \
108: do { \
109: *(lock) = SIMPLE_LOCK_INITIALIZER; \
110: } while (0)
111:
112: /*
113: * Defines of the actual routines, for gcc.
114: */
115:
116: #define flipc_simple_lock_locked(lock) ((*lock) != SIMPLE_LOCK_INITIALIZER)
117:
118: #ifdef __GNUC__
119: extern __inline__ int flipc_simple_lock_try(flipc_simple_lock *lock)
120: {
121: int r;
122: __asm__ volatile("movl $1, %0; xchgl %0, %1" : "=&r" (r), "=m" (*lock));
123: return !r;
124: }
125:
126: /* I don't know why this requires an ASM, but I'll follow the leader. */
127: extern __inline__ void flipc_simple_lock_release(flipc_simple_lock *lock)
128: {
129: register int t;
130:
131: __asm__ volatile("xorl %0, %0; xchgl %0, %1" : "=&r" (t), "=m" (*lock));
132: }
133: #else /* __GNUC__ */
134: /* If we aren't compiling with gcc, the above need to be functions. */
135: #endif /* __GNUC__ */
136:
137: #endif /* _MACH_FLIPC_DEP_H_ */
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