| 0,0 → 1,141 |
|---|
| /* |
| * Copyright (c) 2005 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - 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. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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. |
| */ |
| |
| /** @addtogroup sparc64 |
| * @{ |
| */ |
| /** @file |
| */ |
| |
| #ifndef KERN_sparc64_ATOMIC_H_ |
| #define KERN_sparc64_ATOMIC_H_ |
| |
| #include <arch/barrier.h> |
| #include <arch/types.h> |
| #include <preemption.h> |
| |
| /** Atomic add operation. |
| * |
| * Use atomic compare and swap operation to atomically add signed value. |
| * |
| * @param val Atomic variable. |
| * @param i Signed value to be added. |
| * |
| * @return Value of the atomic variable as it existed before addition. |
| */ |
| static inline long atomic_add(atomic_t *val, int i) |
| { |
| uint64_t a, b; |
| |
| do { |
| volatile uintptr_t x = (uint64_t) &val->count; |
| |
| a = *((uint64_t *) x); |
| b = a + i; |
| asm volatile ("casx %0, %2, %1\n" : "+m" (*((uint64_t *)x)), |
| "+r" (b) : "r" (a)); |
| } while (a != b); |
| |
| return a; |
| } |
| |
| static inline long atomic_preinc(atomic_t *val) |
| { |
| return atomic_add(val, 1) + 1; |
| } |
| |
| static inline long atomic_postinc(atomic_t *val) |
| { |
| return atomic_add(val, 1); |
| } |
| |
| static inline long atomic_predec(atomic_t *val) |
| { |
| return atomic_add(val, -1) - 1; |
| } |
| |
| static inline long atomic_postdec(atomic_t *val) |
| { |
| return atomic_add(val, -1); |
| } |
| |
| static inline void atomic_inc(atomic_t *val) |
| { |
| (void) atomic_add(val, 1); |
| } |
| |
| static inline void atomic_dec(atomic_t *val) |
| { |
| (void) atomic_add(val, -1); |
| } |
| |
| static inline long test_and_set(atomic_t *val) |
| { |
| uint64_t v = 1; |
| volatile uintptr_t x = (uint64_t) &val->count; |
| |
| asm volatile ("casx %0, %2, %1\n" : "+m" (*((uint64_t *) x)), |
| "+r" (v) : "r" (0)); |
| |
| return v; |
| } |
| |
| static inline void atomic_lock_arch(atomic_t *val) |
| { |
| uint64_t tmp1 = 1; |
| uint64_t tmp2 = 0; |
| |
| volatile uintptr_t x = (uint64_t) &val->count; |
| |
| preemption_disable(); |
| |
| asm volatile ( |
| "0:\n" |
| "casx %0, %3, %1\n" |
| "brz %1, 2f\n" |
| "nop\n" |
| "1:\n" |
| "ldx %0, %2\n" |
| "brz %2, 0b\n" |
| "nop\n" |
| "ba 1b\n" |
| "nop\n" |
| "2:\n" |
| : "+m" (*((uint64_t *) x)), "+r" (tmp1), "+r" (tmp2) : "r" (0) |
| ); |
| |
| /* |
| * Prevent critical section code from bleeding out this way up. |
| */ |
| CS_ENTER_BARRIER(); |
| } |
| |
| #endif |
| |
| /** @} |
| */ |