atomic.h revision 48797
138517Sdfr/*- 238517Sdfr * Copyright (c) 1998 Doug Rabson 338517Sdfr * All rights reserved. 438517Sdfr * 538517Sdfr * Redistribution and use in source and binary forms, with or without 638517Sdfr * modification, are permitted provided that the following conditions 738517Sdfr * are met: 838517Sdfr * 1. Redistributions of source code must retain the above copyright 938517Sdfr * notice, this list of conditions and the following disclaimer. 1038517Sdfr * 2. Redistributions in binary form must reproduce the above copyright 1138517Sdfr * notice, this list of conditions and the following disclaimer in the 1238517Sdfr * documentation and/or other materials provided with the distribution. 1338517Sdfr * 1438517Sdfr * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1538517Sdfr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1638517Sdfr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1738517Sdfr * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1838517Sdfr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1938517Sdfr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2038517Sdfr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2138517Sdfr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2238517Sdfr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2338517Sdfr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2438517Sdfr * SUCH DAMAGE. 2538517Sdfr * 2648797Salc * $Id: atomic.h,v 1.2 1999/07/13 03:32:17 alc Exp $ 2738517Sdfr */ 2838517Sdfr#ifndef _MACHINE_ATOMIC_H_ 2938517Sdfr#define _MACHINE_ATOMIC_H_ 3038517Sdfr 3138517Sdfr/* 3238517Sdfr * Various simple arithmetic on memory which is atomic in the presence 3348797Salc * of interrupts and multiple processors. 3438517Sdfr * 3548797Salc * atomic_set_char(P, V) (*(u_char*)(P) |= (V)) 3648797Salc * atomic_clear_char(P, V) (*(u_char*)(P) &= ~(V)) 3748797Salc * atomic_add_char(P, V) (*(u_char*)(P) += (V)) 3848797Salc * atomic_subtract_char(P, V) (*(u_char*)(P) -= (V)) 3948797Salc * 4048797Salc * atomic_set_short(P, V) (*(u_short*)(P) |= (V)) 4148797Salc * atomic_clear_short(P, V) (*(u_short*)(P) &= ~(V)) 4248797Salc * atomic_add_short(P, V) (*(u_short*)(P) += (V)) 4348797Salc * atomic_subtract_short(P, V) (*(u_short*)(P) -= (V)) 4448797Salc * 4548797Salc * atomic_set_int(P, V) (*(u_int*)(P) |= (V)) 4648797Salc * atomic_clear_int(P, V) (*(u_int*)(P) &= ~(V)) 4748797Salc * atomic_add_int(P, V) (*(u_int*)(P) += (V)) 4848797Salc * atomic_subtract_int(P, V) (*(u_int*)(P) -= (V)) 4948797Salc * 5048797Salc * atomic_set_long(P, V) (*(u_long*)(P) |= (V)) 5148797Salc * atomic_clear_long(P, V) (*(u_long*)(P) &= ~(V)) 5248797Salc * atomic_add_long(P, V) (*(u_long*)(P) += (V)) 5348797Salc * atomic_subtract_long(P, V) (*(u_long*)(P) -= (V)) 5438517Sdfr */ 5538517Sdfr 5648797Salc/* 5748797Salc * Make kernel modules portable between UP and SMP. 5848797Salc */ 5948797Salc#if defined(SMP) || defined(KLD_MODULE) 6048797Salc#define MPLOCKED "lock ; " 6148796Salc#else 6248797Salc#define MPLOCKED 6348796Salc#endif 6438517Sdfr 6548797Salc/* 6648797Salc * The assembly is volatilized to demark potential before-and-after side 6748797Salc * effects if an interrupt or SMP collision were to occur. 6848797Salc */ 6948797Salc#define ATOMIC_ASM(NAME, TYPE, OP, V) \ 7048797Salcstatic __inline void \ 7148797Salcatomic_##NAME##_##TYPE(void *p, u_##TYPE v) \ 7248797Salc{ \ 7348797Salc __asm __volatile(MPLOCKED OP \ 7448797Salc : "=m" (*(u_##TYPE *)p) \ 7548797Salc : "0" (*(u_##TYPE *)p), "ir" (V)); \ 7648797Salc} 7738517Sdfr 7848797SalcATOMIC_ASM(set, char, "orb %2,%0", v) 7948797SalcATOMIC_ASM(clear, char, "andb %2,%0", ~v) 8048797SalcATOMIC_ASM(add, char, "addb %2,%0", v) 8148797SalcATOMIC_ASM(subtract, char, "subb %2,%0", v) 8238517Sdfr 8348797SalcATOMIC_ASM(set, short, "orw %2,%0", v) 8448797SalcATOMIC_ASM(clear, short, "andw %2,%0", ~v) 8548797SalcATOMIC_ASM(add, short, "addw %2,%0", v) 8648797SalcATOMIC_ASM(subtract, short, "subw %2,%0", v) 8738517Sdfr 8848797SalcATOMIC_ASM(set, int, "orl %2,%0", v) 8948797SalcATOMIC_ASM(clear, int, "andl %2,%0", ~v) 9048797SalcATOMIC_ASM(add, int, "addl %2,%0", v) 9148797SalcATOMIC_ASM(subtract, int, "subl %2,%0", v) 9248796Salc 9348797SalcATOMIC_ASM(set, long, "orl %2,%0", v) 9448797SalcATOMIC_ASM(clear, long, "andl %2,%0", ~v) 9548797SalcATOMIC_ASM(add, long, "addl %2,%0", v) 9648797SalcATOMIC_ASM(subtract, long, "subl %2,%0", v) 9748796Salc 9838517Sdfr#endif /* ! _MACHINE_ATOMIC_H_ */ 99