Annotation of sys/arch/arm/xscale/i80321_mutex.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: i80321_mutex.c,v 1.1 2007/05/15 05:26:44 miod Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 2004 Artur Grabowski <art@openbsd.org>
! 5: * All rights reserved.
! 6: *
! 7: * Redistribution and use in source and binary forms, with or without
! 8: * modification, are permitted provided that the following conditions
! 9: * are met:
! 10: *
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. The name of the author may not be used to endorse or promote products
! 14: * derived from this software without specific prior written permission.
! 15: *
! 16: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
! 17: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
! 18: * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
! 19: * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
! 20: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
! 21: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
! 22: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
! 23: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
! 24: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
! 25: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 26: */
! 27:
! 28: #include <sys/param.h>
! 29: #include <sys/mutex.h>
! 30: #include <sys/systm.h>
! 31:
! 32: #include <machine/intr.h>
! 33:
! 34: #ifdef MULTIPROCESSOR
! 35: #error This code needs work
! 36: #endif
! 37:
! 38: /*
! 39: * Single processor systems don't need any mutexes, but they need the spl
! 40: * raising semantics of the mutexes.
! 41: */
! 42: void
! 43: mtx_init(struct mutex *mtx, int wantipl)
! 44: {
! 45: mtx->mtx_oldipl = 0;
! 46: mtx->mtx_wantipl = wantipl;
! 47: mtx->mtx_lock = 0;
! 48: }
! 49:
! 50: void
! 51: mtx_enter(struct mutex *mtx)
! 52: {
! 53: if (mtx->mtx_wantipl != IPL_NONE)
! 54: mtx->mtx_oldipl = _splraise(mtx->mtx_wantipl);
! 55:
! 56: MUTEX_ASSERT_UNLOCKED(mtx);
! 57: mtx->mtx_lock = 1;
! 58: }
! 59:
! 60: void
! 61: mtx_leave(struct mutex *mtx)
! 62: {
! 63: MUTEX_ASSERT_LOCKED(mtx);
! 64: mtx->mtx_lock = 0;
! 65: if (mtx->mtx_wantipl != IPL_NONE)
! 66: splx(mtx->mtx_oldipl);
! 67: }
CVSweb