110 lines
4.0 KiB
C
110 lines
4.0 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_ATOMIC_H_
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#define _MACHINE_ATOMIC_H_
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/*
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* Various simple arithmetic on memory which is atomic in the presence
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* of interrupts and multiple processors.
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*
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* atomic_set_char(P, V) (*(u_char*)(P) |= (V))
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* atomic_clear_char(P, V) (*(u_char*)(P) &= ~(V))
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* atomic_add_char(P, V) (*(u_char*)(P) += (V))
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* atomic_subtract_char(P, V) (*(u_char*)(P) -= (V))
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*
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* atomic_set_short(P, V) (*(u_short*)(P) |= (V))
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* atomic_clear_short(P, V) (*(u_short*)(P) &= ~(V))
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* atomic_add_short(P, V) (*(u_short*)(P) += (V))
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* atomic_subtract_short(P, V) (*(u_short*)(P) -= (V))
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*
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* atomic_set_int(P, V) (*(u_int*)(P) |= (V))
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* atomic_clear_int(P, V) (*(u_int*)(P) &= ~(V))
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* atomic_add_int(P, V) (*(u_int*)(P) += (V))
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* atomic_subtract_int(P, V) (*(u_int*)(P) -= (V))
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*
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* atomic_set_long(P, V) (*(u_long*)(P) |= (V))
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* atomic_clear_long(P, V) (*(u_long*)(P) &= ~(V))
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* atomic_add_long(P, V) (*(u_long*)(P) += (V))
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* atomic_subtract_long(P, V) (*(u_long*)(P) -= (V))
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*/
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/*
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* The above functions are expanded inline in the statically-linked
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* kernel. Lock prefixes are generated if an SMP kernel is being
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* built.
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*
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* Kernel modules call real functions which are built into the kernel.
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* This allows kernel modules to be portable between UP and SMP systems.
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*/
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#if defined(KLD_MODULE)
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#define ATOMIC_ASM(NAME, TYPE, OP, V) \
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extern void atomic_##NAME##_##TYPE(volatile u_##TYPE *p, u_##TYPE v);
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#else /* !KLD_MODULE */
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#if defined(SMP)
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#define MPLOCKED "lock ; "
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#else
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#define MPLOCKED
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#endif
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/*
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* The assembly is volatilized to demark potential before-and-after side
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* effects if an interrupt or SMP collision were to occur.
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*/
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#define ATOMIC_ASM(NAME, TYPE, OP, V) \
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static __inline void \
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atomic_##NAME##_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\
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{ \
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__asm __volatile(MPLOCKED OP \
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: "=m" (*p) \
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: "0" (*p), "ir" (V)); \
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}
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#endif /* KLD_MODULE */
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ATOMIC_ASM(set, char, "orb %2,%0", v)
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ATOMIC_ASM(clear, char, "andb %2,%0", ~v)
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ATOMIC_ASM(add, char, "addb %2,%0", v)
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ATOMIC_ASM(subtract, char, "subb %2,%0", v)
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ATOMIC_ASM(set, short, "orw %2,%0", v)
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ATOMIC_ASM(clear, short, "andw %2,%0", ~v)
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ATOMIC_ASM(add, short, "addw %2,%0", v)
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ATOMIC_ASM(subtract, short, "subw %2,%0", v)
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ATOMIC_ASM(set, int, "orl %2,%0", v)
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ATOMIC_ASM(clear, int, "andl %2,%0", ~v)
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ATOMIC_ASM(add, int, "addl %2,%0", v)
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ATOMIC_ASM(subtract, int, "subl %2,%0", v)
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ATOMIC_ASM(set, long, "orl %2,%0", v)
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ATOMIC_ASM(clear, long, "andl %2,%0", ~v)
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ATOMIC_ASM(add, long, "addl %2,%0", v)
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ATOMIC_ASM(subtract, long, "subl %2,%0", v)
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#endif /* ! _MACHINE_ATOMIC_H_ */
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