178 lines
4.6 KiB
C
178 lines
4.6 KiB
C
/* $NetBSD: lock.h,v 1.16 2004/05/19 23:15:43 he Exp $ */
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/*
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* Copyright (c) 2000 Ludd, University of Lule}, Sweden.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed at Ludd, University of Lule}.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _VAX_LOCK_H_
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#define _VAX_LOCK_H_
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#ifdef _KERNEL
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#ifdef _KERNEL_OPT
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#include "opt_multiprocessor.h"
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#include <machine/intr.h>
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#endif
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#include <machine/cpu.h>
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#endif
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static __inline void
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__cpu_simple_lock_init(__cpu_simple_lock_t *alp)
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{
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#ifdef _KERNEL
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__asm__ __volatile ("movl %0,%%r1;jsb Sunlock"
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: /* No output */
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: "g"(alp)
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: "r1","cc","memory");
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#else
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__asm__ __volatile ("bbcci $0,%0,1f;1:"
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: /* No output */
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: "m"(*alp)
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: "cc");
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#endif
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}
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static __inline int
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__cpu_simple_lock_try(__cpu_simple_lock_t *alp)
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{
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int ret;
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#ifdef _KERNEL
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__asm__ __volatile ("movl %1,%%r1;jsb Slocktry;movl %%r0,%0"
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: "=&r"(ret)
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: "g"(alp)
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: "r0","r1","cc","memory");
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#else
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__asm__ __volatile ("clrl %0;bbssi $0,%1,1f;incl %0;1:"
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: "=&r"(ret)
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: "m"(*alp)
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: "cc");
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#endif
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return ret;
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}
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#ifdef _KERNEL
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#define VAX_LOCK_CHECKS ((1 << IPI_SEND_CNCHAR) | (1 << IPI_DDB))
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#define __cpu_simple_lock(alp) \
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do { \
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struct cpu_info *__ci = curcpu(); \
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\
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while (__cpu_simple_lock_try(alp) == 0) { \
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int __s; \
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\
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if (__ci->ci_ipimsgs & VAX_LOCK_CHECKS) { \
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__s = splipi(); \
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cpu_handle_ipi(); \
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splx(__s); \
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} \
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} \
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} while (0)
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#else
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static __inline void
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__cpu_simple_lock(__cpu_simple_lock_t *alp)
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{
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__asm__ __volatile ("1:bbssi $0,%0,1b"
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: /* No outputs */
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: "m"(*alp)
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: "cc");
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}
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#endif /* _KERNEL */
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#if 0
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static __inline void
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__cpu_simple_lock(__cpu_simple_lock_t *alp)
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{
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struct cpu_info *ci = curcpu();
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while (__cpu_simple_lock_try(alp) == 0) {
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int s;
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if (ci->ci_ipimsgs & IPI_SEND_CNCHAR) {
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s = splipi();
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cpu_handle_ipi();
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splx(s);
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}
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}
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#if 0
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__asm__ __volatile ("movl %0,%%r1;jsb Slock"
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: /* No output */
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: "g"(alp)
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: "r0","r1","cc","memory");
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#endif
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#if 0
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__asm__ __volatile ("1:;bbssi $0, %0, 1b"
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: /* No output */
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: "m"(*alp));
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#endif
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}
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#endif
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static __inline void
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__cpu_simple_unlock(__cpu_simple_lock_t *alp)
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{
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#ifdef _KERNEL
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__asm__ __volatile ("movl %0,%%r1;jsb Sunlock"
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: /* No output */
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: "g"(alp)
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: "r1","cc","memory");
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#else
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__asm__ __volatile ("bbcci $0,%0,1f;1:"
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: /* No output */
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: "m"(*alp)
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: "cc");
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#endif
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}
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#if defined(MULTIPROCESSOR)
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/*
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* On the Vax, interprocessor interrupts can come in at device priority
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* level or lower. This can cause some problems while waiting for r/w
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* spinlocks from a high'ish priority level: IPIs that come in will not
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* be processed. This can lead to deadlock.
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*
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* This hook allows IPIs to be processed while a spinlock's interlock
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* is released.
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*/
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#define SPINLOCK_SPIN_HOOK \
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do { \
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struct cpu_info *__ci = curcpu(); \
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int __s; \
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\
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if (__ci->ci_ipimsgs != 0) { \
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/* printf("CPU %lu has IPIs pending\n", \
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__ci->ci_cpuid); */ \
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__s = splipi(); \
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cpu_handle_ipi(); \
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splx(__s); \
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} \
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} while (0)
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#endif /* MULTIPROCESSOR */
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#endif /* _VAX_LOCK_H_ */
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