| /*- |
| * 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/alpha/include/atomic.h,v 1.21.2.3 2005/10/06 18:12:05 jhb Exp $ |
| */ |
| |
| #ifndef _MACHINE_ATOMIC_H_ |
| #define _MACHINE_ATOMIC_H_ |
| |
| /* |
| * Inlines for Alpha instructions normally inaccessible from C. |
| */ |
| |
| static __inline void |
| alpha_mb(void) |
| { |
| __asm__ __volatile__ ("mb"); |
| } |
| |
| /* |
| * Various simple arithmetic on memory which is atomic in the presence |
| * of interrupts and SMP safe. |
| */ |
| |
| void atomic_set_8(volatile uint8_t *, uint8_t); |
| void atomic_clear_8(volatile uint8_t *, uint8_t); |
| void atomic_add_8(volatile uint8_t *, uint8_t); |
| void atomic_subtract_8(volatile uint8_t *, uint8_t); |
| |
| void atomic_set_16(volatile uint16_t *, uint16_t); |
| void atomic_clear_16(volatile uint16_t *, uint16_t); |
| void atomic_add_16(volatile uint16_t *, uint16_t); |
| void atomic_subtract_16(volatile uint16_t *, uint16_t); |
| |
| static __inline void atomic_set_32(volatile uint32_t *p, uint32_t v) |
| { |
| uint32_t temp; |
| |
| __asm __volatile ( |
| "1:\tldl_l %0, %3\n\t" /* load old value */ |
| "bis %0, %2, %0\n\t" /* calculate new value */ |
| "stl_c %0, %1\n\t" /* attempt to store */ |
| "beq %0, 1b\n" /* spin if failed */ |
| : "=&r" (temp), "=m" (*p) |
| : "r" (v), "m" (*p) |
| : "memory"); |
| } |
| |
| static __inline void atomic_clear_32(volatile uint32_t *p, uint32_t v) |
| { |
| uint32_t temp; |
| |
| __asm __volatile ( |
| "1:\tldl_l %0, %3\n\t" /* load old value */ |
| "bic %0, %2, %0\n\t" /* calculate new value */ |
| "stl_c %0, %1\n\t" /* attempt to store */ |
| "beq %0, 1b\n" /* spin if failed */ |
| : "=&r" (temp), "=m" (*p) |
| : "r" (v), "m" (*p) |
| : "memory"); |
| } |
| |
| static __inline void atomic_add_32(volatile uint32_t *p, uint32_t v) |
| { |
| uint32_t temp; |
| |
| __asm __volatile ( |
| "1:\tldl_l %0, %3\n\t" /* load old value */ |
| "addl %0, %2, %0\n\t" /* calculate new value */ |
| "stl_c %0, %1\n\t" /* attempt to store */ |
| "beq %0, 1b\n" /* spin if failed */ |
| : "=&r" (temp), "=m" (*p) |
| : "r" (v), "m" (*p) |
| : "memory"); |
| } |
| |
| static __inline void atomic_subtract_32(volatile uint32_t *p, uint32_t v) |
| { |
| uint32_t temp; |
| |
| __asm __volatile ( |
| "1:\tldl_l %0, %3\n\t" /* load old value */ |
| "subl %0, %2, %0\n\t" /* calculate new value */ |
| "stl_c %0, %1\n\t" /* attempt to store */ |
| "beq %0, 1b\n" /* spin if failed */ |
| : "=&r" (temp), "=m" (*p) |
| : "r" (v), "m" (*p) |
| : "memory"); |
| } |
| |
| static __inline uint32_t atomic_readandclear_32(volatile uint32_t *addr) |
| { |
| uint32_t result,temp; |
| |
| __asm __volatile ( |
| "wmb\n" /* ensure pending writes have drained */ |
| "1:\tldl_l %0,%3\n\t" /* load current value, asserting lock */ |
| "ldiq %1,0\n\t" /* value to store */ |
| "stl_c %1,%2\n\t" /* attempt to store */ |
| "beq %1,1b\n" /* if the store failed, spin */ |
| : "=&r"(result), "=&r"(temp), "=m" (*addr) |
| : "m" (*addr) |
| : "memory"); |
| |
| return result; |
| } |
| |
| static __inline void atomic_set_64(volatile uint64_t *p, uint64_t v) |
| { |
| uint64_t temp; |
| |
| __asm __volatile ( |
| "1:\tldq_l %0, %3\n\t" /* load old value */ |
| "bis %0, %2, %0\n\t" /* calculate new value */ |
| "stq_c %0, %1\n\t" /* attempt to store */ |
| "beq %0, 1b\n" /* spin if failed */ |
| : "=&r" (temp), "=m" (*p) |
| : "r" (v), "m" (*p) |
| : "memory"); |
| } |
| |
| static __inline void atomic_clear_64(volatile uint64_t *p, uint64_t v) |
| { |
| uint64_t temp; |
| |
| __asm __volatile ( |
| "1:\tldq_l %0, %3\n\t" /* load old value */ |
| "bic %0, %2, %0\n\t" /* calculate new value */ |
| "stq_c %0, %1\n\t" /* attempt to store */ |
| "beq %0, 1b\n" /* spin if failed */ |
| : "=&r" (temp), "=m" (*p) |
| : "r" (v), "m" (*p) |
| : "memory"); |
| } |
| |
| static __inline void atomic_add_64(volatile uint64_t *p, uint64_t v) |
| { |
| uint64_t temp; |
| |
| __asm __volatile ( |
| "1:\tldq_l %0, %3\n\t" /* load old value */ |
| "addq %0, %2, %0\n\t" /* calculate new value */ |
| "stq_c %0, %1\n\t" /* attempt to store */ |
| "beq %0, 1b\n" /* spin if failed */ |
| : "=&r" (temp), "=m" (*p) |
| : "r" (v), "m" (*p) |
| : "memory"); |
| } |
| |
| static __inline void atomic_subtract_64(volatile uint64_t *p, uint64_t v) |
| { |
| uint64_t temp; |
| |
| __asm __volatile ( |
| "1:\tldq_l %0, %3\n\t" /* load old value */ |
| "subq %0, %2, %0\n\t" /* calculate new value */ |
| "stq_c %0, %1\n\t" /* attempt to store */ |
| "beq %0, 1b\n" /* spin if failed */ |
| : "=&r" (temp), "=m" (*p) |
| : "r" (v), "m" (*p) |
| : "memory"); |
| } |
| |
| static __inline uint64_t atomic_readandclear_64(volatile uint64_t *addr) |
| { |
| uint64_t result,temp; |
| |
| __asm __volatile ( |
| "wmb\n" /* ensure pending writes have drained */ |
| "1:\tldq_l %0,%3\n\t" /* load current value, asserting lock */ |
| "ldiq %1,0\n\t" /* value to store */ |
| "stq_c %1,%2\n\t" /* attempt to store */ |
| "beq %1,1b\n" /* if the store failed, spin */ |
| : "=&r"(result), "=&r"(temp), "=m" (*addr) |
| : "m" (*addr) |
| : "memory"); |
| |
| return result; |
| } |
| |
| #define ATOMIC_ACQ_REL(NAME, WIDTH) \ |
| static __inline void \ |
| atomic_##NAME##_acq_##WIDTH(volatile uint##WIDTH##_t *p, uint##WIDTH##_t v)\ |
| { \ |
| atomic_##NAME##_##WIDTH(p, v); \ |
| alpha_mb(); \ |
| } \ |
| \ |
| static __inline void \ |
| atomic_##NAME##_rel_##WIDTH(volatile uint##WIDTH##_t *p, uint##WIDTH##_t v)\ |
| { \ |
| alpha_mb(); \ |
| atomic_##NAME##_##WIDTH(p, v); \ |
| } |
| |
| /* Variants of simple arithmetic with memory barriers. */ |
| ATOMIC_ACQ_REL(set, 8) |
| ATOMIC_ACQ_REL(clear, 8) |
| ATOMIC_ACQ_REL(add, 8) |
| ATOMIC_ACQ_REL(subtract, 8) |
| ATOMIC_ACQ_REL(set, 16) |
| ATOMIC_ACQ_REL(clear, 16) |
| ATOMIC_ACQ_REL(add, 16) |
| ATOMIC_ACQ_REL(subtract, 16) |
| ATOMIC_ACQ_REL(set, 32) |
| ATOMIC_ACQ_REL(clear, 32) |
| ATOMIC_ACQ_REL(add, 32) |
| ATOMIC_ACQ_REL(subtract, 32) |
| ATOMIC_ACQ_REL(set, 64) |
| ATOMIC_ACQ_REL(clear, 64) |
| ATOMIC_ACQ_REL(add, 64) |
| ATOMIC_ACQ_REL(subtract, 64) |
| |
| #undef ATOMIC_ACQ_REL |
| |
| /* |
| * We assume that a = b will do atomic loads and stores. |
| */ |
| #define ATOMIC_STORE_LOAD(WIDTH) \ |
| static __inline uint##WIDTH##_t \ |
| atomic_load_acq_##WIDTH(volatile uint##WIDTH##_t *p) \ |
| { \ |
| uint##WIDTH##_t v; \ |
| \ |
| v = *p; \ |
| alpha_mb(); \ |
| return (v); \ |
| } \ |
| \ |
| static __inline void \ |
| atomic_store_rel_##WIDTH(volatile uint##WIDTH##_t *p, uint##WIDTH##_t v)\ |
| { \ |
| alpha_mb(); \ |
| *p = v; \ |
| } |
| |
| ATOMIC_STORE_LOAD(32) |
| ATOMIC_STORE_LOAD(64) |
| |
| #undef ATOMIC_STORE_LOAD |
| |
| /* |
| * Atomically compare the value stored at *p with cmpval and if the |
| * two values are equal, update the value of *p with newval. Returns |
| * zero if the compare failed, nonzero otherwise. |
| */ |
| static __inline uint32_t |
| atomic_cmpset_32(volatile uint32_t* p, uint32_t cmpval, uint32_t newval) |
| { |
| uint32_t ret; |
| |
| __asm __volatile ( |
| "1:\tldl_l %0, %4\n\t" /* load old value */ |
| "cmpeq %0, %2, %0\n\t" /* compare */ |
| "beq %0, 2f\n\t" /* exit if not equal */ |
| "mov %3, %0\n\t" /* value to store */ |
| "stl_c %0, %1\n\t" /* attempt to store */ |
| "beq %0, 1b\n\t" /* if it failed, spin */ |
| "2:\n" |
| : "=&r" (ret), "=m" (*p) |
| : "r" ((long)(int)cmpval), "r" (newval), "m" (*p) |
| : "memory"); |
| |
| return ret; |
| } |
| |
| /* |
| * Atomically compare the value stored at *p with cmpval and if the |
| * two values are equal, update the value of *p with newval. Returns |
| * zero if the compare failed, nonzero otherwise. |
| */ |
| static __inline uint64_t |
| atomic_cmpset_64(volatile uint64_t* p, uint64_t cmpval, uint64_t newval) |
| { |
| uint64_t ret; |
| |
| __asm __volatile ( |
| "1:\tldq_l %0, %4\n\t" /* load old value */ |
| "cmpeq %0, %2, %0\n\t" /* compare */ |
| "beq %0, 2f\n\t" /* exit if not equal */ |
| "mov %3, %0\n\t" /* value to store */ |
| "stq_c %0, %1\n\t" /* attempt to store */ |
| "beq %0, 1b\n\t" /* if it failed, spin */ |
| "2:\n" |
| : "=&r" (ret), "=m" (*p) |
| : "r" (cmpval), "r" (newval), "m" (*p) |
| : "memory"); |
| |
| return ret; |
| } |
| |
| static __inline uint32_t |
| atomic_cmpset_acq_32(volatile uint32_t *p, uint32_t cmpval, uint32_t newval) |
| { |
| int retval; |
| |
| retval = atomic_cmpset_32(p, cmpval, newval); |
| alpha_mb(); |
| return (retval); |
| } |
| |
| static __inline uint32_t |
| atomic_cmpset_rel_32(volatile uint32_t *p, uint32_t cmpval, uint32_t newval) |
| { |
| alpha_mb(); |
| return (atomic_cmpset_32(p, cmpval, newval)); |
| } |
| |
| static __inline uint64_t |
| atomic_cmpset_acq_64(volatile uint64_t *p, uint64_t cmpval, uint64_t newval) |
| { |
| int retval; |
| |
| retval = atomic_cmpset_64(p, cmpval, newval); |
| alpha_mb(); |
| return (retval); |
| } |
| |
| static __inline uint64_t |
| atomic_cmpset_rel_64(volatile uint64_t *p, uint64_t cmpval, uint64_t newval) |
| { |
| alpha_mb(); |
| return (atomic_cmpset_64(p, cmpval, newval)); |
| } |
| |
| /* |
| * Atomically add the value of v to the integer pointed to by p and return |
| * the previous value of *p. |
| */ |
| static __inline uint |
| atomic_fetchadd_32(volatile uint32_t *p, uint32_t v) |
| { |
| uint32_t value, temp; |
| |
| __asm __volatile ( |
| "1:\tldl_l %0, %1\n\t" /* load old value */ |
| "addl %0, %3, %2\n\t" /* calculate new value */ |
| "stl_c %2, %1\n\t" /* attempt to store */ |
| "beq %2, 1b\n" /* spin if failed */ |
| : "=&r" (value), "=m" (*p), "=r" (temp) |
| : "r" (v), "m" (*p)); |
| |
| return (value); |
| } |
| |
| /* Operations on chars. */ |
| #define atomic_set_char atomic_set_8 |
| #define atomic_set_acq_char atomic_set_acq_8 |
| #define atomic_set_rel_char atomic_set_rel_8 |
| #define atomic_clear_char atomic_clear_8 |
| #define atomic_clear_acq_char atomic_clear_acq_8 |
| #define atomic_clear_rel_char atomic_clear_rel_8 |
| #define atomic_add_char atomic_add_8 |
| #define atomic_add_acq_char atomic_add_acq_8 |
| #define atomic_add_rel_char atomic_add_rel_8 |
| #define atomic_subtract_char atomic_subtract_8 |
| #define atomic_subtract_acq_char atomic_subtract_acq_8 |
| #define atomic_subtract_rel_char atomic_subtract_rel_8 |
| |
| /* Operations on shorts. */ |
| #define atomic_set_short atomic_set_16 |
| #define atomic_set_acq_short atomic_set_acq_16 |
| #define atomic_set_rel_short atomic_set_rel_16 |
| #define atomic_clear_short atomic_clear_16 |
| #define atomic_clear_acq_short atomic_clear_acq_16 |
| #define atomic_clear_rel_short atomic_clear_rel_16 |
| #define atomic_add_short atomic_add_16 |
| #define atomic_add_acq_short atomic_add_acq_16 |
| #define atomic_add_rel_short atomic_add_rel_16 |
| #define atomic_subtract_short atomic_subtract_16 |
| #define atomic_subtract_acq_short atomic_subtract_acq_16 |
| #define atomic_subtract_rel_short atomic_subtract_rel_16 |
| |
| /* Operations on ints. */ |
| #define atomic_set_int atomic_set_32 |
| #define atomic_set_acq_int atomic_set_acq_32 |
| #define atomic_set_rel_int atomic_set_rel_32 |
| #define atomic_clear_int atomic_clear_32 |
| #define atomic_clear_acq_int atomic_clear_acq_32 |
| #define atomic_clear_rel_int atomic_clear_rel_32 |
| #define atomic_add_int atomic_add_32 |
| #define atomic_add_acq_int atomic_add_acq_32 |
| #define atomic_add_rel_int atomic_add_rel_32 |
| #define atomic_subtract_int atomic_subtract_32 |
| #define atomic_subtract_acq_int atomic_subtract_acq_32 |
| #define atomic_subtract_rel_int atomic_subtract_rel_32 |
| #define atomic_cmpset_int atomic_cmpset_32 |
| #define atomic_cmpset_acq_int atomic_cmpset_acq_32 |
| #define atomic_cmpset_rel_int atomic_cmpset_rel_32 |
| #define atomic_load_acq_int atomic_load_acq_32 |
| #define atomic_store_rel_int atomic_store_rel_32 |
| #define atomic_readandclear_int atomic_readandclear_32 |
| #define atomic_fetchadd_int atomic_fetchadd_32 |
| |
| /* Operations on longs. */ |
| #define atomic_set_long atomic_set_64 |
| #define atomic_set_acq_long atomic_set_acq_64 |
| #define atomic_set_rel_long atomic_set_rel_64 |
| #define atomic_clear_long atomic_clear_64 |
| #define atomic_clear_acq_long atomic_clear_acq_64 |
| #define atomic_clear_rel_long atomic_clear_rel_64 |
| #define atomic_add_long atomic_add_64 |
| #define atomic_add_acq_long atomic_add_acq_64 |
| #define atomic_add_rel_long atomic_add_rel_64 |
| #define atomic_subtract_long atomic_subtract_64 |
| #define atomic_subtract_acq_long atomic_subtract_acq_64 |
| #define atomic_subtract_rel_long atomic_subtract_rel_64 |
| #define atomic_cmpset_long atomic_cmpset_64 |
| #define atomic_cmpset_acq_long atomic_cmpset_acq_64 |
| #define atomic_cmpset_rel_long atomic_cmpset_rel_64 |
| #define atomic_load_acq_long atomic_load_acq_64 |
| #define atomic_store_rel_long atomic_store_rel_64 |
| #define atomic_readandclear_long atomic_readandclear_64 |
| |
| /* Operations on pointers. */ |
| #define atomic_set_ptr atomic_set_64 |
| #define atomic_set_acq_ptr atomic_set_acq_64 |
| #define atomic_set_rel_ptr atomic_set_rel_64 |
| #define atomic_clear_ptr atomic_clear_64 |
| #define atomic_clear_acq_ptr atomic_clear_acq_64 |
| #define atomic_clear_rel_ptr atomic_clear_rel_64 |
| #define atomic_add_ptr atomic_add_64 |
| #define atomic_add_acq_ptr atomic_add_acq_64 |
| #define atomic_add_rel_ptr atomic_add_rel_64 |
| #define atomic_subtract_ptr atomic_subtract_64 |
| #define atomic_subtract_acq_ptr atomic_subtract_acq_64 |
| #define atomic_subtract_rel_ptr atomic_subtract_rel_64 |
| #define atomic_cmpset_ptr atomic_cmpset_64 |
| #define atomic_cmpset_acq_ptr atomic_cmpset_acq_64 |
| #define atomic_cmpset_rel_ptr atomic_cmpset_rel_64 |
| #define atomic_load_acq_ptr atomic_load_acq_64 |
| #define atomic_store_rel_ptr atomic_store_rel_64 |
| #define atomic_readandclear_ptr atomic_readandclear_64 |
| |
| #endif /* ! _MACHINE_ATOMIC_H_ */ |
