| 1 | /*
|
|---|
| 2 | * Copyright (c) 2005 Martin Decky
|
|---|
| 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 |
|
|---|
| 29 | /** @addtogroup ppc32
|
|---|
| 30 | * @{
|
|---|
| 31 | */
|
|---|
| 32 | /** @file
|
|---|
| 33 | */
|
|---|
| 34 |
|
|---|
| 35 | #ifndef KERN_ppc32_ATOMIC_H_
|
|---|
| 36 | #define KERN_ppc32_ATOMIC_H_
|
|---|
| 37 |
|
|---|
| 38 | static inline void atomic_inc(atomic_t *val)
|
|---|
| 39 | {
|
|---|
| 40 | atomic_count_t tmp;
|
|---|
| 41 |
|
|---|
| 42 | asm volatile (
|
|---|
| 43 | "1:\n"
|
|---|
| 44 | "lwarx %0, 0, %2\n"
|
|---|
| 45 | "addic %0, %0, 1\n"
|
|---|
| 46 | "stwcx. %0, 0, %2\n"
|
|---|
| 47 | "bne- 1b"
|
|---|
| 48 | : "=&r" (tmp),
|
|---|
| 49 | "=m" (val->count)
|
|---|
| 50 | : "r" (&val->count),
|
|---|
| 51 | "m" (val->count)
|
|---|
| 52 | : "cc"
|
|---|
| 53 | );
|
|---|
| 54 | }
|
|---|
| 55 |
|
|---|
| 56 | static inline void atomic_dec(atomic_t *val)
|
|---|
| 57 | {
|
|---|
| 58 | atomic_count_t tmp;
|
|---|
| 59 |
|
|---|
| 60 | asm volatile (
|
|---|
| 61 | "1:\n"
|
|---|
| 62 | "lwarx %0, 0, %2\n"
|
|---|
| 63 | "addic %0, %0, -1\n"
|
|---|
| 64 | "stwcx. %0, 0, %2\n"
|
|---|
| 65 | "bne- 1b"
|
|---|
| 66 | : "=&r" (tmp),
|
|---|
| 67 | "=m" (val->count)
|
|---|
| 68 | : "r" (&val->count),
|
|---|
| 69 | "m" (val->count)
|
|---|
| 70 | : "cc"
|
|---|
| 71 | );
|
|---|
| 72 | }
|
|---|
| 73 |
|
|---|
| 74 | static inline atomic_count_t atomic_postinc(atomic_t *val)
|
|---|
| 75 | {
|
|---|
| 76 | atomic_inc(val);
|
|---|
| 77 | return val->count - 1;
|
|---|
| 78 | }
|
|---|
| 79 |
|
|---|
| 80 | static inline atomic_count_t atomic_postdec(atomic_t *val)
|
|---|
| 81 | {
|
|---|
| 82 | atomic_dec(val);
|
|---|
| 83 | return val->count + 1;
|
|---|
| 84 | }
|
|---|
| 85 |
|
|---|
| 86 | static inline atomic_count_t atomic_preinc(atomic_t *val)
|
|---|
| 87 | {
|
|---|
| 88 | atomic_inc(val);
|
|---|
| 89 | return val->count;
|
|---|
| 90 | }
|
|---|
| 91 |
|
|---|
| 92 | static inline atomic_count_t atomic_predec(atomic_t *val)
|
|---|
| 93 | {
|
|---|
| 94 | atomic_dec(val);
|
|---|
| 95 | return val->count;
|
|---|
| 96 | }
|
|---|
| 97 |
|
|---|
| 98 | #endif
|
|---|
| 99 |
|
|---|
| 100 | /** @}
|
|---|
| 101 | */
|
|---|
