104 lines
3.4 KiB
C
104 lines
3.4 KiB
C
/*-
|
|
* Copyright (c) 2002 Matthew Dillon. All Rights Reserved.
|
|
* 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.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
|
|
*
|
|
* This file contains prototypes and high-level inlines related to
|
|
* machine-level critical function support:
|
|
*
|
|
* cpu_critical_enter() - inlined
|
|
* cpu_critical_exit() - inlined
|
|
* cpu_critical_fork_exit() - prototyped
|
|
* related support functions residing
|
|
* in <arch>/<arch>/critical.c - prototyped
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _MACHINE_CRITICAL_H_
|
|
#define _MACHINE_CRITICAL_H_
|
|
|
|
__BEGIN_DECLS
|
|
|
|
/*
|
|
* Prototypes - see <arch>/<arch>/critical.c
|
|
*/
|
|
void cpu_unpend(void);
|
|
void cpu_critical_fork_exit(void);
|
|
|
|
#ifdef __GNUC__
|
|
|
|
/*
|
|
* cpu_critical_enter:
|
|
*
|
|
* This routine is called from critical_enter() on the 0->1 transition
|
|
* of td_critnest, prior to it being incremented to 1.
|
|
*
|
|
* If new-style critical section handling we do not have to do anything.
|
|
* However, as a side effect any interrupts occuring while td_critnest
|
|
* is non-zero will be deferred.
|
|
*/
|
|
#define cpu_critical_enter()
|
|
|
|
/*
|
|
* cpu_critical_exit:
|
|
*
|
|
* This routine is called from critical_exit() on a 1->0 transition
|
|
* of td_critnest, after it has been decremented to 0. We are
|
|
* exiting the last critical section.
|
|
*
|
|
* Note that the td->critnest (1->0) transition interrupt race against
|
|
* our int_pending/unpend() check below is handled by the interrupt
|
|
* code for us, so we do not have to do anything fancy.
|
|
*/
|
|
static __inline void
|
|
cpu_critical_exit(void)
|
|
{
|
|
/*
|
|
* We may have to schedule pending interrupts. Create
|
|
* conditions similar to an interrupt context and call
|
|
* unpend().
|
|
*
|
|
* note: we do this even if we are in an interrupt
|
|
* nesting level. Deep nesting is protected by
|
|
* critical_*() and if we conditionalized it then we
|
|
* would have to check int_pending again whenever
|
|
* we decrement td_intr_nesting_level to 0.
|
|
*/
|
|
if (PCPU_GET(int_pending))
|
|
cpu_unpend();
|
|
}
|
|
|
|
#else /* !__GNUC__ */
|
|
|
|
void cpu_critical_enter(void)
|
|
void cpu_critical_exit(void)
|
|
|
|
#endif /* __GNUC__ */
|
|
|
|
__END_DECLS
|
|
|
|
#endif /* !_MACHINE_CRITICAL_H_ */
|
|
|