/* * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The 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, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * Copyright (C) 1998 Apple Computer * All Rights Reserved */ /* * @OSF_COPYRIGHT@ */ /* * Mach Operating System * Copyright (c) 1991,1990 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie Mellon * the rights to redistribute these changes. */ /* */ /* * Machine-dependent simple locks for the i386. */ #ifdef KERNEL_PRIVATE #ifndef _I386_LOCK_H_ #define _I386_LOCK_H_ #include #ifdef __APPLE_API_PRIVATE #ifdef MACH_KERNEL_PRIVATE #include #include #include #include #include #include typedef lck_rw_t lock_t; extern unsigned int LockTimeOutTSC; /* Lock timeout in TSC ticks */ extern unsigned int LockTimeOut; /* Lock timeout in absolute time */ #if defined(__GNUC__) /* * General bit-lock routines. */ #define bit_lock(bit,l) \ __asm__ volatile(" jmp 1f \n \ 0: btl %0, %1 \n \ jb 0b \n \ 1: lock \n \ btsl %0,%1 \n \ jb 0b" : \ : \ "r" (bit), "m" (*(volatile int *)(l)) : \ "memory"); #define bit_unlock(bit,l) \ __asm__ volatile(" lock \n \ btrl %0,%1" : \ : \ "r" (bit), "m" (*(volatile int *)(l))); /* * Set or clear individual bits in a long word. * The locked access is needed only to lock access * to the word, not to individual bits. */ #define i_bit_set(bit,l) \ __asm__ volatile(" lock \n \ btsl %0,%1" : \ : \ "r" (bit), "m" (*(volatile int *)(l))); #define i_bit_clear(bit,l) \ __asm__ volatile(" lock \n \ btrl %0,%1" : \ : \ "r" (bit), "m" (*(volatile int *)(l))); static inline char xchgb(volatile char * cp, char new); static inline void atomic_incl(volatile long * p, long delta); static inline void atomic_incs(volatile short * p, short delta); static inline void atomic_incb(volatile char * p, char delta); static inline void atomic_decl(volatile long * p, long delta); static inline void atomic_decs(volatile short * p, short delta); static inline void atomic_decb(volatile char * p, char delta); static inline long atomic_getl(const volatile long * p); static inline short atomic_gets(const volatile short * p); static inline char atomic_getb(const volatile char * p); static inline void atomic_setl(volatile long * p, long value); static inline void atomic_sets(volatile short * p, short value); static inline void atomic_setb(volatile char * p, char value); static inline char xchgb(volatile char * cp, char new) { register char old = new; __asm__ volatile (" xchgb %0,%2" : "=q" (old) : "0" (new), "m" (*(volatile char *)cp) : "memory"); return (old); } static inline void atomic_incl(volatile long * p, long delta) { __asm__ volatile (" lock \n \ add %0,%1" : \ : \ "r" (delta), "m" (*(volatile long *)p)); } static inline void atomic_incs(volatile short * p, short delta) { __asm__ volatile (" lock \n \ addw %0,%1" : \ : \ "q" (delta), "m" (*(volatile short *)p)); } static inline void atomic_incb(volatile char * p, char delta) { __asm__ volatile (" lock \n \ addb %0,%1" : \ : \ "q" (delta), "m" (*(volatile char *)p)); } static inline void atomic_decl(volatile long * p, long delta) { __asm__ volatile (" lock \n \ sub %0,%1" : \ : \ "r" (delta), "m" (*(volatile long *)p)); } static inline int atomic_decl_and_test(volatile long * p, long delta) { uint8_t ret; __asm__ volatile ( " lock \n\t" " sub %1,%2 \n\t" " sete %0" : "=qm" (ret) : "r" (delta), "m" (*(volatile long *)p)); return ret; } static inline void atomic_decs(volatile short * p, short delta) { __asm__ volatile (" lock \n \ subw %0,%1" : \ : \ "q" (delta), "m" (*(volatile short *)p)); } static inline void atomic_decb(volatile char * p, char delta) { __asm__ volatile (" lock \n \ subb %0,%1" : \ : \ "q" (delta), "m" (*(volatile char *)p)); } static inline long atomic_getl(const volatile long * p) { return (*p); } static inline short atomic_gets(const volatile short * p) { return (*p); } static inline char atomic_getb(const volatile char * p) { return (*p); } static inline void atomic_setl(volatile long * p, long value) { *p = value; } static inline void atomic_sets(volatile short * p, short value) { *p = value; } static inline void atomic_setb(volatile char * p, char value) { *p = value; } #else /* !defined(__GNUC__) */ extern void i_bit_set( int index, void *addr); extern void i_bit_clear( int index, void *addr); extern void bit_lock( int index, void *addr); extern void bit_unlock( int index, void *addr); /* * All other routines defined in __GNUC__ case lack * definitions otherwise. - XXX */ #endif /* !defined(__GNUC__) */ extern void kernel_preempt_check (void); #endif /* MACH_KERNEL_PRIVATE */ #endif /* __APLE_API_PRIVATE */ #endif /* _I386_LOCK_H_ */ #endif /* KERNEL_PRIVATE */