Rev 4377 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 112 | jermar | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2005 Jakub Jermar |
| 112 | jermar | 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 | * |
||
| 9 | * - Redistributions of source code must retain the above copyright |
||
| 10 | * notice, this list of conditions and the following disclaimer. |
||
| 11 | * - Redistributions in binary form must reproduce the above copyright |
||
| 12 | * notice, this list of conditions and the following disclaimer in the |
||
| 13 | * documentation and/or other materials provided with the distribution. |
||
| 14 | * - The name of the author may not be used to endorse or promote products |
||
| 15 | * derived from this software without specific prior written permission. |
||
| 16 | * |
||
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | */ |
||
| 28 | |||
| 1888 | jermar | 29 | /** @addtogroup ia64 |
| 1702 | cejka | 30 | * @{ |
| 31 | */ |
||
| 32 | /** @file |
||
| 33 | */ |
||
| 34 | |||
| 1888 | jermar | 35 | #ifndef KERN_ia64_ATOMIC_H_ |
| 36 | #define KERN_ia64_ATOMIC_H_ |
||
| 112 | jermar | 37 | |
| 627 | jermar | 38 | /** Atomic addition. |
| 39 | * |
||
| 4377 | svoboda | 40 | * @param val Atomic value. |
| 41 | * @param imm Value to add. |
||
| 627 | jermar | 42 | * |
| 4377 | svoboda | 43 | * @return Value before addition. |
| 627 | jermar | 44 | */ |
| 1104 | jermar | 45 | static inline long atomic_add(atomic_t *val, int imm) |
| 475 | jermar | 46 | { |
| 1104 | jermar | 47 | long v; |
| 475 | jermar | 48 | |
| 4377 | svoboda | 49 | asm volatile ("fetchadd8.rel %0 = %1, %2\n" : "=r" (v), |
| 50 | "+m" (val->count) : "i" (imm)); |
||
| 477 | vana | 51 | |
| 475 | jermar | 52 | return v; |
| 112 | jermar | 53 | } |
| 54 | |||
| 4692 | svoboda | 55 | static inline uint64_t test_and_set(atomic_t *val) |
| 56 | { |
||
| 3597 | svoboda | 57 | uint64_t v; |
| 58 | |||
| 59 | asm volatile ( |
||
| 4692 | svoboda | 60 | "movl %0 = 0x1;;\n" |
| 4377 | svoboda | 61 | "xchg8 %0 = %1, %0;;\n" |
| 62 | : "=r" (v), "+m" (val->count) |
||
| 3597 | svoboda | 63 | ); |
| 64 | |||
| 65 | return v; |
||
| 66 | } |
||
| 67 | |||
| 4692 | svoboda | 68 | static inline void atomic_lock_arch(atomic_t *val) |
| 69 | { |
||
| 70 | do { |
||
| 71 | while (val->count) |
||
| 72 | ; |
||
| 73 | } while (test_and_set(val)); |
||
| 74 | } |
||
| 3597 | svoboda | 75 | |
| 4377 | svoboda | 76 | static inline void atomic_inc(atomic_t *val) |
| 77 | { |
||
| 78 | atomic_add(val, 1); |
||
| 79 | } |
||
| 475 | jermar | 80 | |
| 4377 | svoboda | 81 | static inline void atomic_dec(atomic_t *val) |
| 82 | { |
||
| 83 | atomic_add(val, -1); |
||
| 84 | } |
||
| 477 | vana | 85 | |
| 4377 | svoboda | 86 | static inline long atomic_preinc(atomic_t *val) |
| 87 | { |
||
| 88 | return atomic_add(val, 1) + 1; |
||
| 89 | } |
||
| 477 | vana | 90 | |
| 4377 | svoboda | 91 | static inline long atomic_predec(atomic_t *val) |
| 92 | { |
||
| 93 | return atomic_add(val, -1) - 1; |
||
| 94 | } |
||
| 95 | |||
| 96 | static inline long atomic_postinc(atomic_t *val) |
||
| 97 | { |
||
| 98 | return atomic_add(val, 1); |
||
| 99 | } |
||
| 100 | |||
| 101 | static inline long atomic_postdec(atomic_t *val) |
||
| 102 | { |
||
| 103 | return atomic_add(val, -1); |
||
| 104 | } |
||
| 105 | |||
| 112 | jermar | 106 | #endif |
| 1702 | cejka | 107 | |
| 1888 | jermar | 108 | /** @} |
| 1702 | cejka | 109 | */ |