| /*- |
| * Copyright (c) 1998 Doug Rabson |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * $FreeBSD: src/sys/amd64/include/atomic.h,v 1.34.2.4 2005/10/06 18:12:05 jhb Exp $ |
| */ |
| #ifndef _MACHINE_ATOMIC_H_ |
| #define _MACHINE_ATOMIC_H_ |
| |
| /* |
| * Various simple arithmetic on memory which is atomic in the presence |
| * of interrupts and multiple processors. |
| * |
| * atomic_set_char(P, V) (*(u_char*)(P) |= (V)) |
| * atomic_clear_char(P, V) (*(u_char*)(P) &= ~(V)) |
| * atomic_add_char(P, V) (*(u_char*)(P) += (V)) |
| * atomic_subtract_char(P, V) (*(u_char*)(P) -= (V)) |
| * |
| * atomic_set_short(P, V) (*(u_short*)(P) |= (V)) |
| * atomic_clear_short(P, V) (*(u_short*)(P) &= ~(V)) |
| * atomic_add_short(P, V) (*(u_short*)(P) += (V)) |
| * atomic_subtract_short(P, V) (*(u_short*)(P) -= (V)) |
| * |
| * atomic_set_int(P, V) (*(u_int*)(P) |= (V)) |
| * atomic_clear_int(P, V) (*(u_int*)(P) &= ~(V)) |
| * atomic_add_int(P, V) (*(u_int*)(P) += (V)) |
| * atomic_subtract_int(P, V) (*(u_int*)(P) -= (V)) |
| * atomic_readandclear_int(P) (return *(u_int*)P; *(u_int*)P = 0;) |
| * |
| * atomic_set_long(P, V) (*(u_long*)(P) |= (V)) |
| * atomic_clear_long(P, V) (*(u_long*)(P) &= ~(V)) |
| * atomic_add_long(P, V) (*(u_long*)(P) += (V)) |
| * atomic_subtract_long(P, V) (*(u_long*)(P) -= (V)) |
| * atomic_readandclear_long(P) (return *(u_long*)P; *(u_long*)P = 0;) |
| */ |
| |
| /* |
| * For userland, assume the SMP case and use lock prefixes so that |
| * the binaries will run on both types of systems. |
| */ |
| #define MPLOCKED lock ; |
| //#define MPLOCKED |
| |
| /* |
| * The assembly is volatilized to demark potential before-and-after side |
| * effects if an interrupt or SMP collision were to occur. |
| */ |
| #define ATOMIC_ASM(NAME, TYPE, OP, CONS, V) \ |
| static __inline void \ |
| atomic_##NAME##_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\ |
| { \ |
| __asm __volatile(__XSTRING(MPLOCKED) OP \ |
| : "=m" (*p) \ |
| : CONS (V), "m" (*p)); \ |
| } \ |
| struct __hack |
| |
| /* |
| * Atomic compare and set, used by the mutex functions |
| * |
| * if (*dst == exp) *dst = src (all 32 bit words) |
| * |
| * Returns 0 on failure, non-zero on success |
| */ |
| |
| static __inline int |
| atomic_cmpset_int(volatile u_int *dst, u_int exp, u_int src) |
| { |
| int res = exp; |
| |
| __asm __volatile ( |
| " " __XSTRING(MPLOCKED) " " |
| " cmpxchgl %2,%1 ; " |
| " setz %%al ; " |
| " movzbl %%al,%0 ; " |
| "1: " |
| "# atomic_cmpset_int" |
| : "+a" (res), /* 0 (result) */ |
| "=m" (*dst) /* 1 */ |
| : "r" (src), /* 2 */ |
| "m" (*dst) /* 3 */ |
| : "memory"); |
| |
| return (res); |
| } |
| |
| static __inline int |
| atomic_cmpset_long(volatile u_long *dst, u_long exp, u_long src) |
| { |
| long res = exp; |
| |
| __asm __volatile ( |
| " " __XSTRING(MPLOCKED) " " |
| " cmpxchgq %2,%1 ; " |
| " setz %%al ; " |
| " movzbq %%al,%0 ; " |
| "1: " |
| "# atomic_cmpset_long" |
| : "+a" (res), /* 0 (result) */ |
| "=m" (*dst) /* 1 */ |
| : "r" (src), /* 2 */ |
| "m" (*dst) /* 3 */ |
| : "memory"); |
| |
| return (res); |
| } |
| |
| /* |
| * Atomically add the value of v to the integer pointed to by p and return |
| * the previous value of *p. |
| */ |
| static __inline u_int |
| atomic_fetchadd_int(volatile u_int *p, u_int v) |
| { |
| |
| __asm __volatile ( |
| " " __XSTRING(MPLOCKED) " " |
| " xaddl %0, %1 ; " |
| "# atomic_fetchadd_int" |
| : "+r" (v), /* 0 (result) */ |
| "=m" (*p) /* 1 */ |
| : "m" (*p)); /* 2 */ |
| |
| return (v); |
| } |
| |
| static __inline u_int |
| atomic_fetchsubtract_int(volatile u_int *p, int v) |
| { |
| int w = -v; |
| |
| __asm __volatile ( |
| " " __XSTRING(MPLOCKED) " " |
| " xaddl %0, %1 ; " |
| "# atomic_fetchsubtract_int" |
| : "+r" (w), /* 0 (result) */ |
| "=m" (*p) /* 1 */ |
| : "m" (*p)); /* 2 */ |
| |
| return (w); |
| } |
| |
| #define ATOMIC_STORE_LOAD(TYPE, LOP, SOP) \ |
| static __inline u_##TYPE \ |
| atomic_load_acq_##TYPE(volatile u_##TYPE *p) \ |
| { \ |
| u_##TYPE res; \ |
| \ |
| __asm __volatile(__XSTRING(MPLOCKED) LOP \ |
| : "=a" (res), /* 0 (result) */\ |
| "=m" (*p) /* 1 */ \ |
| : "m" (*p) /* 2 */ \ |
| : "memory"); \ |
| \ |
| return (res); \ |
| } \ |
| \ |
| /* \ |
| * The XCHG instruction asserts LOCK automagically. \ |
| */ \ |
| static __inline void \ |
| atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\ |
| { \ |
| __asm __volatile(SOP \ |
| : "=m" (*p), /* 0 */ \ |
| "+r" (v) /* 1 */ \ |
| : "m" (*p)); /* 2 */ \ |
| } \ |
| struct __hack |
| |
| ATOMIC_ASM(set, char, "orb %b1,%0", "iq", v); |
| ATOMIC_ASM(clear, char, "andb %b1,%0", "iq", ~v); |
| ATOMIC_ASM(add, char, "addb %b1,%0", "iq", v); |
| ATOMIC_ASM(subtract, char, "subb %b1,%0", "iq", v); |
| |
| ATOMIC_ASM(set, short, "orw %w1,%0", "ir", v); |
| ATOMIC_ASM(clear, short, "andw %w1,%0", "ir", ~v); |
| ATOMIC_ASM(add, short, "addw %w1,%0", "ir", v); |
| ATOMIC_ASM(subtract, short, "subw %w1,%0", "ir", v); |
| |
| ATOMIC_ASM(set, int, "orl %1,%0", "ir", v); |
| ATOMIC_ASM(clear, int, "andl %1,%0", "ir", ~v); |
| ATOMIC_ASM(add, int, "addl %1,%0", "ir", v); |
| ATOMIC_ASM(subtract, int, "subl %1,%0", "ir", v); |
| |
| ATOMIC_ASM(set, long, "orq %1,%0", "ir", v); |
| ATOMIC_ASM(clear, long, "andq %1,%0", "ir", ~v); |
| ATOMIC_ASM(add, long, "addq %1,%0", "ir", v); |
| ATOMIC_ASM(subtract, long, "subq %1,%0", "ir", v); |
| |
| ATOMIC_STORE_LOAD(char, "cmpxchgb %b0,%1", "xchgb %b1,%0"); |
| ATOMIC_STORE_LOAD(short,"cmpxchgw %w0,%1", "xchgw %w1,%0"); |
| ATOMIC_STORE_LOAD(int, "cmpxchgl %0,%1", "xchgl %1,%0"); |
| ATOMIC_STORE_LOAD(long, "cmpxchgq %0,%1", "xchgq %1,%0"); |
| |
| #undef ATOMIC_ASM |
| #undef ATOMIC_STORE_LOAD |
| |
| /* Read the current value and store a zero in the destination. */ |
| static __inline u_int |
| atomic_readandclear_int(volatile u_int *addr) |
| { |
| u_int result; |
| |
| result = 0; |
| __asm __volatile ( |
| " xchgl %1,%0 ; " |
| "# atomic_readandclear_int" |
| : "+r" (result), /* 0 (result) */ |
| "=m" (*addr) /* 1 (addr) */ |
| : "m" (*addr)); |
| |
| return (result); |
| } |
| |
| static __inline u_long |
| atomic_readandclear_long(volatile u_long *addr) |
| { |
| u_long result; |
| |
| result = 0; |
| __asm __volatile ( |
| " xchgq %1,%0 ; " |
| "# atomic_readandclear_long" |
| : "+r" (result), /* 0 (result) */ |
| "=m" (*addr) /* 1 (addr) */ |
| : "m" (*addr)); |
| |
| return (result); |
| } |
| |
| /* Acquire and release variants are identical to the normal ones. */ |
| #define atomic_set_acq_char atomic_set_char |
| #define atomic_set_rel_char atomic_set_char |
| #define atomic_clear_acq_char atomic_clear_char |
| #define atomic_clear_rel_char atomic_clear_char |
| #define atomic_add_acq_char atomic_add_char |
| #define atomic_add_rel_char atomic_add_char |
| #define atomic_subtract_acq_char atomic_subtract_char |
| #define atomic_subtract_rel_char atomic_subtract_char |
| |
| #define atomic_set_acq_short atomic_set_short |
| #define atomic_set_rel_short atomic_set_short |
| #define atomic_clear_acq_short atomic_clear_short |
| #define atomic_clear_rel_short atomic_clear_short |
| #define atomic_add_acq_short atomic_add_short |
| #define atomic_add_rel_short atomic_add_short |
| #define atomic_subtract_acq_short atomic_subtract_short |
| #define atomic_subtract_rel_short atomic_subtract_short |
| |
| #define atomic_set_acq_int atomic_set_int |
| #define atomic_set_rel_int atomic_set_int |
| #define atomic_clear_acq_int atomic_clear_int |
| #define atomic_clear_rel_int atomic_clear_int |
| #define atomic_add_acq_int atomic_add_int |
| #define atomic_add_rel_int atomic_add_int |
| #define atomic_subtract_acq_int atomic_subtract_int |
| #define atomic_subtract_rel_int atomic_subtract_int |
| #define atomic_cmpset_acq_int atomic_cmpset_int |
| #define atomic_cmpset_rel_int atomic_cmpset_int |
| |
| #define atomic_set_acq_long atomic_set_long |
| #define atomic_set_rel_long atomic_set_long |
| #define atomic_clear_acq_long atomic_clear_long |
| #define atomic_clear_rel_long atomic_clear_long |
| #define atomic_add_acq_long atomic_add_long |
| #define atomic_add_rel_long atomic_add_long |
| #define atomic_subtract_acq_long atomic_subtract_long |
| #define atomic_subtract_rel_long atomic_subtract_long |
| #define atomic_cmpset_acq_long atomic_cmpset_long |
| #define atomic_cmpset_rel_long atomic_cmpset_long |
| |
| /* Operations on 8-bit bytes. */ |
| #define atomic_set_8 atomic_set_char |
| #define atomic_set_acq_8 atomic_set_acq_char |
| #define atomic_set_rel_8 atomic_set_rel_char |
| #define atomic_clear_8 atomic_clear_char |
| #define atomic_clear_acq_8 atomic_clear_acq_char |
| #define atomic_clear_rel_8 atomic_clear_rel_char |
| #define atomic_add_8 atomic_add_char |
| #define atomic_add_acq_8 atomic_add_acq_char |
| #define atomic_add_rel_8 atomic_add_rel_char |
| #define atomic_subtract_8 atomic_subtract_char |
| #define atomic_subtract_acq_8 atomic_subtract_acq_char |
| #define atomic_subtract_rel_8 atomic_subtract_rel_char |
| #define atomic_load_acq_8 atomic_load_acq_char |
| #define atomic_store_rel_8 atomic_store_rel_char |
| |
| /* Operations on 16-bit words. */ |
| #define atomic_set_16 atomic_set_short |
| #define atomic_set_acq_16 atomic_set_acq_short |
| #define atomic_set_rel_16 atomic_set_rel_short |
| #define atomic_clear_16 atomic_clear_short |
| #define atomic_clear_acq_16 atomic_clear_acq_short |
| #define atomic_clear_rel_16 atomic_clear_rel_short |
| #define atomic_add_16 atomic_add_short |
| #define atomic_add_acq_16 atomic_add_acq_short |
| #define atomic_add_rel_16 atomic_add_rel_short |
| #define atomic_subtract_16 atomic_subtract_short |
| #define atomic_subtract_acq_16 atomic_subtract_acq_short |
| #define atomic_subtract_rel_16 atomic_subtract_rel_short |
| #define atomic_load_acq_16 atomic_load_acq_short |
| #define atomic_store_rel_16 atomic_store_rel_short |
| |
| /* Operations on 32-bit double words. */ |
| #define atomic_set_32 atomic_set_int |
| #define atomic_set_acq_32 atomic_set_acq_int |
| #define atomic_set_rel_32 atomic_set_rel_int |
| #define atomic_clear_32 atomic_clear_int |
| #define atomic_clear_acq_32 atomic_clear_acq_int |
| #define atomic_clear_rel_32 atomic_clear_rel_int |
| #define atomic_add_32 atomic_add_int |
| #define atomic_add_acq_32 atomic_add_acq_int |
| #define atomic_add_rel_32 atomic_add_rel_int |
| #define atomic_subtract_32 atomic_subtract_int |
| #define atomic_subtract_acq_32 atomic_subtract_acq_int |
| #define atomic_subtract_rel_32 atomic_subtract_rel_int |
| #define atomic_load_acq_32 atomic_load_acq_int |
| #define atomic_store_rel_32 atomic_store_rel_int |
| #define atomic_cmpset_32 atomic_cmpset_int |
| #define atomic_cmpset_acq_32 atomic_cmpset_acq_int |
| #define atomic_cmpset_rel_32 atomic_cmpset_rel_int |
| #define atomic_readandclear_32 atomic_readandclear_int |
| #define atomic_fetchadd_32 atomic_fetchadd_int |
| #define atomic_fetchsubtract_32 atomic_fetchsubtract_int |
| |
| /* Operations on 64-bit quad words. */ |
| #define atomic_set_64 atomic_set_long |
| #define atomic_set_acq_64 atomic_set_acq_long |
| #define atomic_set_rel_64 atomic_set_rel_long |
| #define atomic_clear_64 atomic_clear_long |
| #define atomic_clear_acq_64 atomic_clear_acq_long |
| #define atomic_clear_rel_64 atomic_clear_rel_long |
| #define atomic_add_64 atomic_add_long |
| #define atomic_add_acq_64 atomic_add_acq_long |
| #define atomic_add_rel_64 atomic_add_rel_long |
| #define atomic_subtract_64 atomic_subtract_long |
| #define atomic_subtract_acq_64 atomic_subtract_acq_long |
| #define atomic_subtract_rel_64 atomic_subtract_rel_long |
| #define atomic_load_acq_64 atomic_load_acq_long |
| #define atomic_store_rel_64 atomic_store_rel_long |
| #define atomic_cmpset_64 atomic_cmpset_long |
| #define atomic_cmpset_acq_64 atomic_cmpset_acq_long |
| #define atomic_cmpset_rel_64 atomic_cmpset_rel_long |
| #define atomic_readandclear_64 atomic_readandclear_long |
| |
| /* Operations on pointers. */ |
| #define atomic_set_ptr atomic_set_long |
| #define atomic_set_acq_ptr atomic_set_acq_long |
| #define atomic_set_rel_ptr atomic_set_rel_long |
| #define atomic_clear_ptr atomic_clear_long |
| #define atomic_clear_acq_ptr atomic_clear_acq_long |
| #define atomic_clear_rel_ptr atomic_clear_rel_long |
| #define atomic_add_ptr atomic_add_long |
| #define atomic_add_acq_ptr atomic_add_acq_long |
| #define atomic_add_rel_ptr atomic_add_rel_long |
| #define atomic_subtract_ptr atomic_subtract_long |
| #define atomic_subtract_acq_ptr atomic_subtract_acq_long |
| #define atomic_subtract_rel_ptr atomic_subtract_rel_long |
| #define atomic_load_acq_ptr atomic_load_acq_long |
| #define atomic_store_rel_ptr atomic_store_rel_long |
| #define atomic_cmpset_ptr atomic_cmpset_long |
| #define atomic_cmpset_acq_ptr atomic_cmpset_acq_long |
| #define atomic_cmpset_rel_ptr atomic_cmpset_rel_long |
| #define atomic_readandclear_ptr atomic_readandclear_long |
| |
| #endif /* ! _MACHINE_ATOMIC_H_ */ |
