7e1f6dfe9d
- The MD functions critical_enter/exit are renamed to start with a cpu_ prefix. - MI wrapper functions critical_enter/exit maintain a per-thread nesting count and a per-thread critical section saved state set when entering a critical section while at nesting level 0 and restored when exiting to nesting level 0. This moves the saved state out of spin mutexes so that interlocking spin mutexes works properly. - Most low-level MD code that used critical_enter/exit now use cpu_critical_enter/exit. MI code such as device drivers and spin mutexes use the MI wrappers. Note that since the MI wrappers store the state in the current thread, they do not have any return values or arguments. - mtx_intr_enable() is replaced with a constant CRITICAL_FORK which is assigned to curthread->td_savecrit during fork_exit(). Tested on: i386, alpha
159 lines
2.9 KiB
C
159 lines
2.9 KiB
C
/*-
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* Copyright (c) 1998 Doug Rabson
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_CPUFUNC_H_
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#define _MACHINE_CPUFUNC_H_
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#ifdef _KERNEL
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#include <sys/types.h>
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#include <machine/psl.h>
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#define CRITICAL_FORK (mfmsr() |= PSL_EE)
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#ifdef __GNUC__
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static __inline void
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breakpoint(void)
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{
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return;
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}
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#endif
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/* CPU register mangling inlines */
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static __inline void
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mtmsr(unsigned int value)
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{
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__asm __volatile ("mtmsr %0" :: "r"(value));
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}
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static __inline unsigned int
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mfmsr(void)
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{
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unsigned int value;
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__asm __volatile ("mfmsr %0" : "=r"(value));
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return (value);
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}
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static __inline void
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mtdec(unsigned int value)
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{
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__asm __volatile ("mtdec %0" :: "r"(value));
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}
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static __inline unsigned int
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mfdec(void)
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{
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unsigned int value;
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__asm __volatile ("mfdec %0" : "=r"(value));
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return (value);
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}
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/*
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* Bogus interrupt manipulation
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*/
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static __inline void
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disable_intr(void)
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{
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unsigned int msr;
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msr = mfmsr();
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mtmsr(msr & ~PSL_EE);
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}
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static __inline void
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enable_intr(void)
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{
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unsigned int msr;
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msr = mfmsr();
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mtmsr(msr | PSL_EE);
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}
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static __inline unsigned int
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save_intr(void)
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{
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unsigned int msr;
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msr = mfmsr();
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return msr;
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}
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static __inline critical_t
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cpu_critical_enter(void)
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{
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return ((critical_t)save_intr());
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}
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static __inline void
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restore_intr(unsigned int msr)
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{
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mtmsr(msr);
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}
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static __inline void
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cpu_critical_exit(critical_t msr)
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{
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return (restore_intr((unsigned int)msr));
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}
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static __inline void
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powerpc_mb(void)
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{
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__asm __volatile("eieio; sync" : : : "memory");
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}
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static __inline struct pcpu *
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powerpc_get_pcpup(void)
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{
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struct pcpu *ret;
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__asm ("mfsprg %0, 0" : "=r"(ret));
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return(ret);
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}
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#endif /* _KERNEL */
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#endif /* !_MACHINE_CPUFUNC_H_ */
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