freebsd-dev/sys/powerpc/include/critical.h

77 lines
1.5 KiB
C

/*-
* Copyright (c) 2002 Matthew Dillon. This code is distributed under
* the BSD copyright, /usr/src/COPYRIGHT.
*
* 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
* cpu_thread_link() - 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_critical_fork_exit(void);
void cpu_thread_link(struct thread *td);
#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.
*/
static __inline void
cpu_critical_enter(void)
{
u_int msr;
struct thread *td = curthread;
msr = mfmsr();
td->td_md.md_savecrit = msr;
msr &= ~PSL_EE;
mtmsr(msr);
}
/*
* 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.
*/
static __inline void
cpu_critical_exit(void)
{
struct thread *td = curthread;
mtmsr(td->td_md.md_savecrit);
}
#else /* !__GNUC__ */
void cpu_critical_enter(void)
void cpu_critical_exit(void)
#endif /* __GNUC__ */
__END_DECLS
#endif /* !_MACHINE_CRITICAL_H_ */