5da7ea0a89
volatile so that the compiler won't perform CSE. For SMP, this may result in us accessing the wrong PCPU and as such results in a bogus curthread value. Note that getting curthread is not quite MP-safe in the sense that it requires two instructions that aren't performed atomically. The first instruction gets the address of the PCPU structure and the second instruction dereferences that pointer to get curthread. If a thread is switched-out in between these instructions and switched-in on a different CPU, we still get the wrong curthread.
169 lines
3.1 KiB
C
169 lines
3.1 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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/*
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* Required for user-space atomic.h includes
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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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#ifdef _KERNEL
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#include <sys/types.h>
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#include <machine/psl.h>
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#include <machine/spr.h>
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struct thread;
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#ifdef KDB
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void breakpoint(void);
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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(register_t value)
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{
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__asm __volatile ("mtmsr %0; isync" :: "r"(value));
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}
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static __inline register_t
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mfmsr(void)
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{
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register_t 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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mtsrin(vm_offset_t va, register_t value)
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{
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__asm __volatile ("mtsrin %0,%1" :: "r"(value), "r"(va));
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}
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static __inline register_t
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mfsrin(vm_offset_t va)
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{
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register_t value;
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__asm __volatile ("mfsrin %0,%1" : "=r"(value) : "r"(va));
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return (value);
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}
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static __inline void
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mtdec(register_t 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 register_t
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mfdec(void)
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{
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register_t 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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static __inline register_t
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mfpvr(void)
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{
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register_t value;
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__asm __volatile ("mfpvr %0" : "=r"(value));
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return (value);
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}
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static __inline void
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eieio(void)
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{
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__asm __volatile ("eieio");
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}
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static __inline void
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isync(void)
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{
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__asm __volatile ("isync");
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}
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static __inline void
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powerpc_sync(void)
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{
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__asm __volatile ("sync");
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}
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static __inline register_t
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intr_disable(void)
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{
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register_t msr;
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msr = mfmsr();
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mtmsr(msr & ~PSL_EE);
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return (msr);
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}
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static __inline void
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intr_restore(register_t msr)
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{
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mtmsr(msr);
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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 __volatile("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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