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| Rev | Author | Line No. | Line |
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| 1110 | jermar | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2005 Ondrej Palkovsky |
| 1110 | jermar | 3 | * All rights reserved. |
| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 1866 | jermar | 29 | /** @addtogroup libcmips32 |
| 1656 | cejka | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 1657 | cejka | 33 | * @ingroup libcmips32eb |
| 1656 | cejka | 34 | */ |
| 35 | |||
| 1866 | jermar | 36 | #ifndef LIBC_mips32_ATOMIC_H_ |
| 37 | #define LIBC_mips32_ATOMIC_H_ |
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| 1110 | jermar | 38 | |
| 39 | #define atomic_inc(x) ((void) atomic_add(x, 1)) |
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| 40 | #define atomic_dec(x) ((void) atomic_add(x, -1)) |
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| 41 | |||
| 42 | #define atomic_postinc(x) (atomic_add(x, 1) - 1) |
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| 43 | #define atomic_postdec(x) (atomic_add(x, -1) + 1) |
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| 44 | |||
| 45 | #define atomic_preinc(x) atomic_add(x, 1) |
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| 46 | #define atomic_predec(x) atomic_add(x, -1) |
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| 47 | |||
| 48 | /* Atomic addition of immediate value. |
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| 49 | * |
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| 50 | * @param val Memory location to which will be the immediate value added. |
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| 51 | * @param i Signed immediate that will be added to *val. |
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| 52 | * |
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| 53 | * @return Value after addition. |
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| 54 | */ |
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| 55 | static inline long atomic_add(atomic_t *val, int i) |
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| 56 | { |
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| 57 | long tmp, v; |
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| 58 | |||
| 2082 | decky | 59 | asm volatile ( |
| 1110 | jermar | 60 | "1:\n" |
| 61 | " ll %0, %1\n" |
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| 4055 | trochtova | 62 | " addu %0, %0, %3\n" /* same as add, but never traps on overflow */ |
| 1110 | jermar | 63 | " move %2, %0\n" |
| 64 | " sc %0, %1\n" |
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| 65 | " beq %0, %4, 1b\n" /* if the atomic operation failed, try again */ |
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| 66 | /* nop */ /* nop is inserted automatically by compiler */ |
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| 4055 | trochtova | 67 | " nop\n" |
| 68 | : "=&r" (tmp), "+m" (val->count), "=&r" (v) |
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| 69 | : "r" (i), "i" (0) |
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| 1110 | jermar | 70 | ); |
| 71 | |||
| 72 | return v; |
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| 73 | } |
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| 74 | |||
| 75 | #endif |
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| 1656 | cejka | 76 | |
| 1866 | jermar | 77 | /** @} |
| 1656 | cejka | 78 | */ |