123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
/* $NetBSD: lock.h,v 1.15 2017/09/17 00:01:07 christos Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2000 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Jason R. Thorpe.
|
|
*
|
|
* 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 _M68K_LOCK_H_
|
|
#define _M68K_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_init(__cpu_simple_lock_t *alp)
|
|
{
|
|
|
|
*alp = __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(__cpu_simple_lock_t *alp)
|
|
{
|
|
|
|
__asm volatile(
|
|
"1: tas %0 \n"
|
|
" jne 1b \n"
|
|
: "=m" (*alp));
|
|
}
|
|
|
|
static __inline int
|
|
__cpu_simple_lock_try(__cpu_simple_lock_t *alp)
|
|
{
|
|
int __rv;
|
|
|
|
__asm volatile(
|
|
" moveq #1, %1 \n"
|
|
" tas %0 \n"
|
|
" jeq 1f \n"
|
|
" moveq #0, %1 \n"
|
|
"1: \n"
|
|
: "=m" (*alp), "=d" (__rv));
|
|
|
|
return (__rv);
|
|
}
|
|
|
|
static __inline void
|
|
__cpu_simple_unlock(__cpu_simple_lock_t *alp)
|
|
{
|
|
|
|
*alp = __SIMPLELOCK_UNLOCKED;
|
|
}
|
|
|
|
static __inline void
|
|
mb_read(void)
|
|
{
|
|
__asm volatile("" : : : "memory");
|
|
}
|
|
|
|
static __inline void
|
|
mb_write(void)
|
|
{
|
|
__asm volatile("" : : : "memory");
|
|
}
|
|
|
|
static __inline void
|
|
mb_memory(void)
|
|
{
|
|
__asm volatile("" : : : "memory");
|
|
}
|
|
|
|
#endif /* _M68K_LOCK_H_ */
|