/* $NetBSD: lock.h,v 1.13.8.1 2020/03/03 18:54:59 martin Exp $ */ /*- * Copyright (c) 2000, 2007 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe and Andrew Doran. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Machine-dependent spin lock operations. */ #ifndef _POWERPC_LOCK_H_ #define _POWERPC_LOCK_H_ static __inline int __SIMPLELOCK_LOCKED_P(const __cpu_simple_lock_t *__ptr) { return *__ptr == __SIMPLELOCK_LOCKED; } static __inline int __SIMPLELOCK_UNLOCKED_P(const __cpu_simple_lock_t *__ptr) { return *__ptr == __SIMPLELOCK_UNLOCKED; } static __inline void __cpu_simple_lock_clear(__cpu_simple_lock_t *__ptr) { *__ptr = __SIMPLELOCK_UNLOCKED; } static __inline void __cpu_simple_lock_set(__cpu_simple_lock_t *__ptr) { *__ptr = __SIMPLELOCK_LOCKED; } static __inline void __cpu_simple_lock_init(__cpu_simple_lock_t *alp) { *alp = __SIMPLELOCK_UNLOCKED; __asm volatile ("sync"); } static __inline void __cpu_simple_lock(__cpu_simple_lock_t *alp) { int old; __asm volatile (" \ \n\ 1: lwarx %0,0,%1 \n\ cmpwi %0,%2 \n\ beq+ 3f \n\ 2: lwzx %0,0,%1 \n\ cmpwi %0,%2 \n\ beq+ 1b \n\ b 2b \n" #ifdef IBM405_ERRATA77 "dcbt 0,%1 \n" #endif " \ 3: stwcx. %3,0,%1 \n\ bne- 1b \n\ isync \n\ \n" : "=&r"(old) : "r"(alp), "I"(__SIMPLELOCK_UNLOCKED), "r"(__SIMPLELOCK_LOCKED) : "memory"); } static __inline int __cpu_simple_lock_try(__cpu_simple_lock_t *alp) { int old, dummy; __asm volatile (" \ \n\ 1: lwarx %0,0,%1 \n\ cmpwi %0,%2 \n\ bne 2f \n" #ifdef IBM405_ERRATA77 "dcbt 0,%1 \n" #endif "stwcx. %3,0,%1 \n\ bne- 1b \n" #ifdef IBM405_ERRATA77 "dcbt 0,%4 \n" #endif " \ 2: stwcx. %3,0,%4 \n\ isync \n\ \n" : "=&r"(old) : "r"(alp), "I"(__SIMPLELOCK_UNLOCKED), "r"(__SIMPLELOCK_LOCKED), "r"(&dummy) : "memory"); return (old == __SIMPLELOCK_UNLOCKED); } static __inline void __cpu_simple_unlock(__cpu_simple_lock_t *alp) { __asm volatile ("sync"); *alp = __SIMPLELOCK_UNLOCKED; } static __inline void mb_read(void) { __asm volatile ("isync" ::: "memory"); } static __inline void mb_write(void) { __asm volatile ("sync" ::: "memory"); } static __inline void mb_memory(void) { __asm volatile ("sync" ::: "memory"); } #endif /* _POWERPC_LOCK_H_ */