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Annotation of XNU/osfmk/mach/i386/flipc_dep.h, revision 1.1

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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