77 lines
1.5 KiB
C
77 lines
1.5 KiB
C
/*-
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* Copyright (c) 2002 Matthew Dillon. This code is distributed under
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* the BSD copyright, /usr/src/COPYRIGHT.
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*
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* This file contains prototypes and high-level inlines related to
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* machine-level critical function support:
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*
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* cpu_critical_enter() - inlined
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* cpu_critical_exit() - inlined
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* cpu_critical_fork_exit() - prototyped
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* cpu_thread_link() - prototyped
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* related support functions residing
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* in <arch>/<arch>/critical.c - prototyped
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_CRITICAL_H_
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#define _MACHINE_CRITICAL_H_
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__BEGIN_DECLS
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/*
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* Prototypes - see <arch>/<arch>/critical.c
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*/
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void cpu_critical_fork_exit(void);
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void cpu_thread_link(struct thread *td);
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#ifdef __GNUC__
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/*
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* cpu_critical_enter:
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*
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* This routine is called from critical_enter() on the 0->1 transition
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* of td_critnest, prior to it being incremented to 1.
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*/
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static __inline void
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cpu_critical_enter(void)
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{
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u_int msr;
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struct thread *td = curthread;
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msr = mfmsr();
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td->td_md.md_savecrit = msr;
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msr &= ~PSL_EE;
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mtmsr(msr);
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}
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/*
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* cpu_critical_exit:
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*
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* This routine is called from critical_exit() on a 1->0 transition
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* of td_critnest, after it has been decremented to 0. We are
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* exiting the last critical section.
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*/
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static __inline void
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cpu_critical_exit(void)
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{
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struct thread *td = curthread;
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mtmsr(td->td_md.md_savecrit);
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}
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#else /* !__GNUC__ */
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void cpu_critical_enter(void)
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void cpu_critical_exit(void)
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#endif /* __GNUC__ */
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__END_DECLS
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#endif /* !_MACHINE_CRITICAL_H_ */
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