/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_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 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. * * @APPLE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ * */ /* * HISTORY * * Revision 1.1.1.1 1998/09/22 21:05:31 wsanchez * Import of Mac OS X kernel (~semeria) * * Revision 1.1.1.1 1998/03/07 02:25:47 wsanchez * Import of OSF Mach kernel (~mburg) * * Revision 1.1.5.1 1995/06/13 18:20:42 sjs * Merge from flipc_shared. * [95/06/07 sjs] * * Revision 1.1.3.3 1995/02/21 17:23:16 randys * Re-indented code to four space indentation * [1995/02/21 16:26:50 randys] * * Revision 1.1.3.2 1994/12/20 19:02:12 randys * Moved definition of flipc_simple_lock to flipc_cb.h * [1994/12/20 17:35:15 randys] * * Moved the machine independent macros into mach/flipc_locks.h * [1994/12/20 16:44:14 randys] * * Added filename in comment at top of file * [1994/12/19 20:29:36 randys] * * Fixed incorrect return of lock_try * [1994/12/13 00:36:46 randys] * * Revision 1.1.3.1 1994/12/12 17:46:29 randys * Putting initial flipc implementation under flipc_shared * [1994/12/12 16:27:51 randys] * * Revision 1.1.1.2 1994/12/11 23:08:36 randys * Initial flipc code checkin. * * $EndLog$ */ /* * mach/i386/flipc_dep.h * * This file will have all of the FLIPC implementation machine dependent * defines that need to be visible to both kernel and AIL (eg. bus locks * and bus synchronization primitives). */ #ifndef _MACH_FLIPC_DEP_H_ #define _MACH_FLIPC_DEP_H_ /* For the 386, we don't need to wrap synchronization variable writes at all. */ #define SYNCVAR_WRITE(statement) statement /* And similarly (I believe; check on this), for the 386 there isn't any requirement for write fences. */ #define WRITE_FENCE() /* * Flipc simple lock defines. These are almost completely for the use * of the AIL; the reason they are in this file is that they need to * be initialized properly in the communications buffer initialization * routine. Sigh. Note in particular that the kernel has no defined * "simple_lock_yield_function", so it had better never expand the * macro simple_lock_acquire. * * These locks may be declared by "flipc_simple_lock lock;". If they * are instead declared by FLIPC_DECL_SIMPLE_LOCK(class,lockname) they * may be used without initialization. */ #define SIMPLE_LOCK_INITIALIZER 0 #define FLIPC_DECL_SIMPLE_LOCK(class,lockname) \ class flipc_simple_lock (lockname) = SIMPLE_LOCK_INITIALIZER /* * Lower case because they may be macros or functions. * I'll include the function prototypes just for examples here. */ #define flipc_simple_lock_init(lock) \ do { \ *(lock) = SIMPLE_LOCK_INITIALIZER; \ } while (0) /* * Defines of the actual routines, for gcc. */ #define flipc_simple_lock_locked(lock) ((*lock) != SIMPLE_LOCK_INITIALIZER) #ifdef __GNUC__ extern __inline__ int flipc_simple_lock_try(flipc_simple_lock *lock) { int r; __asm__ volatile("movl $1, %0; xchgl %0, %1" : "=&r" (r), "=m" (*lock)); return !r; } /* I don't know why this requires an ASM, but I'll follow the leader. */ extern __inline__ void flipc_simple_lock_release(flipc_simple_lock *lock) { register int t; __asm__ volatile("xorl %0, %0; xchgl %0, %1" : "=&r" (t), "=m" (*lock)); } #else /* __GNUC__ */ /* If we aren't compiling with gcc, the above need to be functions. */ #endif /* __GNUC__ */ #endif /* _MACH_FLIPC_DEP_H_ */