| atomic.h (49043) | atomic.h (49999) |
|---|---|
| 1/*- 2 * Copyright (c) 1998 Doug Rabson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright --- 9 unchanged lines hidden (view full) --- 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * | 1/*- 2 * Copyright (c) 1998 Doug Rabson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright --- 9 unchanged lines hidden (view full) --- 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * |
| 26 * $Id: atomic.h,v 1.3 1999/07/13 06:35:25 alc Exp $ | 26 * $Id: atomic.h,v 1.4 1999/07/23 23:45:19 alc Exp $ |
| 27 */ 28#ifndef _MACHINE_ATOMIC_H_ 29#define _MACHINE_ATOMIC_H_ 30 31/* 32 * Various simple arithmetic on memory which is atomic in the presence 33 * of interrupts and multiple processors. 34 * --- 14 unchanged lines hidden (view full) --- 49 * 50 * atomic_set_long(P, V) (*(u_long*)(P) |= (V)) 51 * atomic_clear_long(P, V) (*(u_long*)(P) &= ~(V)) 52 * atomic_add_long(P, V) (*(u_long*)(P) += (V)) 53 * atomic_subtract_long(P, V) (*(u_long*)(P) -= (V)) 54 */ 55 56/* | 27 */ 28#ifndef _MACHINE_ATOMIC_H_ 29#define _MACHINE_ATOMIC_H_ 30 31/* 32 * Various simple arithmetic on memory which is atomic in the presence 33 * of interrupts and multiple processors. 34 * --- 14 unchanged lines hidden (view full) --- 49 * 50 * atomic_set_long(P, V) (*(u_long*)(P) |= (V)) 51 * atomic_clear_long(P, V) (*(u_long*)(P) &= ~(V)) 52 * atomic_add_long(P, V) (*(u_long*)(P) += (V)) 53 * atomic_subtract_long(P, V) (*(u_long*)(P) -= (V)) 54 */ 55 56/* |
| 57 * Make kernel modules portable between UP and SMP. | 57 * The above functions are expanded inline in the statically-linked 58 * kernel. Lock prefixes are generated if an SMP kernel is being 59 * built. 60 * 61 * Kernel modules call real functions which are built into the kernel. 62 * This allows kernel modules to be portable between UP and SMP systems. |
| 58 */ | 63 */ |
| 59#if defined(SMP) || defined(KLD_MODULE) | 64#if defined(KLD_MODULE) 65#define ATOMIC_ASM(NAME, TYPE, OP, V) \ 66 extern void atomic_##NAME##_##TYPE(volatile u_##TYPE *p, u_##TYPE v); 67 68#else /* !KLD_MODULE */ 69#if defined(SMP) |
| 60#define MPLOCKED "lock ; " 61#else 62#define MPLOCKED 63#endif 64 65/* 66 * The assembly is volatilized to demark potential before-and-after side 67 * effects if an interrupt or SMP collision were to occur. 68 */ 69#define ATOMIC_ASM(NAME, TYPE, OP, V) \ 70static __inline void \ 71atomic_##NAME##_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\ 72{ \ 73 __asm __volatile(MPLOCKED OP \ 74 : "=m" (*p) \ 75 : "0" (*p), "ir" (V)); \ 76} | 70#define MPLOCKED "lock ; " 71#else 72#define MPLOCKED 73#endif 74 75/* 76 * The assembly is volatilized to demark potential before-and-after side 77 * effects if an interrupt or SMP collision were to occur. 78 */ 79#define ATOMIC_ASM(NAME, TYPE, OP, V) \ 80static __inline void \ 81atomic_##NAME##_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\ 82{ \ 83 __asm __volatile(MPLOCKED OP \ 84 : "=m" (*p) \ 85 : "0" (*p), "ir" (V)); \ 86} |
| 87#endif /* KLD_MODULE */ |
|
| 77 78ATOMIC_ASM(set, char, "orb %2,%0", v) 79ATOMIC_ASM(clear, char, "andb %2,%0", ~v) 80ATOMIC_ASM(add, char, "addb %2,%0", v) 81ATOMIC_ASM(subtract, char, "subb %2,%0", v) 82 83ATOMIC_ASM(set, short, "orw %2,%0", v) 84ATOMIC_ASM(clear, short, "andw %2,%0", ~v) --- 14 unchanged lines hidden --- | 88 89ATOMIC_ASM(set, char, "orb %2,%0", v) 90ATOMIC_ASM(clear, char, "andb %2,%0", ~v) 91ATOMIC_ASM(add, char, "addb %2,%0", v) 92ATOMIC_ASM(subtract, char, "subb %2,%0", v) 93 94ATOMIC_ASM(set, short, "orw %2,%0", v) 95ATOMIC_ASM(clear, short, "andw %2,%0", ~v) --- 14 unchanged lines hidden --- |