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| Rev | Author | Line No. | Line |
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| 1 | jermar | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2005 Ondrej Palkovsky |
| 1 | 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 | |||
| 1769 | jermar | 29 | /** @addtogroup mips32 |
| 1702 | cejka | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 1888 | jermar | 35 | #ifndef KERN_mips32_ATOMIC_H_ |
| 36 | #define KERN_mips32_ATOMIC_H_ |
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| 1 | jermar | 37 | |
| 4153 | mejdrech | 38 | #define atomic_inc(x) ((void) atomic_add(x, 1)) |
| 39 | #define atomic_dec(x) ((void) atomic_add(x, -1)) |
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| 1 | jermar | 40 | |
| 4153 | mejdrech | 41 | #define atomic_postinc(x) (atomic_add(x, 1) - 1) |
| 42 | #define atomic_postdec(x) (atomic_add(x, -1) + 1) |
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| 477 | vana | 43 | |
| 4153 | mejdrech | 44 | #define atomic_preinc(x) atomic_add(x, 1) |
| 45 | #define atomic_predec(x) atomic_add(x, -1) |
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| 477 | vana | 46 | |
| 483 | jermar | 47 | /* Atomic addition of immediate value. |
| 111 | palkovsky | 48 | * |
| 483 | jermar | 49 | * @param val Memory location to which will be the immediate value added. |
| 50 | * @param i Signed immediate that will be added to *val. |
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| 51 | * |
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| 52 | * @return Value after addition. |
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| 111 | palkovsky | 53 | */ |
| 1104 | jermar | 54 | static inline long atomic_add(atomic_t *val, int i) |
| 111 | palkovsky | 55 | { |
| 1104 | jermar | 56 | long tmp, v; |
| 4153 | mejdrech | 57 | |
| 2082 | decky | 58 | asm volatile ( |
| 111 | palkovsky | 59 | "1:\n" |
| 483 | jermar | 60 | " ll %0, %1\n" |
| 4153 | mejdrech | 61 | " addu %0, %0, %3\n" /* same as addi, but never traps on overflow */ |
| 62 | " move %2, %0\n" |
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| 483 | jermar | 63 | " sc %0, %1\n" |
| 4153 | mejdrech | 64 | " beq %0, %4, 1b\n" /* if the atomic operation failed, try again */ |
| 1769 | jermar | 65 | " nop\n" |
| 3162 | jermar | 66 | : "=&r" (tmp), "+m" (val->count), "=&r" (v) |
| 3167 | svoboda | 67 | : "r" (i), "i" (0) |
| 4153 | mejdrech | 68 | ); |
| 69 | |||
| 70 | return v; |
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| 71 | } |
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| 111 | palkovsky | 72 | |
| 4153 | mejdrech | 73 | static inline uint32_t test_and_set(atomic_t *val) { |
| 74 | uint32_t tmp, v; |
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| 75 | |||
| 76 | asm volatile ( |
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| 77 | "1:\n" |
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| 78 | " ll %2, %1\n" |
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| 79 | " bnez %2, 2f\n" |
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| 80 | " li %0, %3\n" |
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| 81 | " sc %0, %1\n" |
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| 82 | " beqz %0, 1b\n" |
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| 83 | "2:\n" |
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| 84 | : "=&r" (tmp), "+m" (val->count), "=&r" (v) |
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| 85 | : "i" (1) |
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| 86 | ); |
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| 87 | |||
| 483 | jermar | 88 | return v; |
| 111 | palkovsky | 89 | } |
| 90 | |||
| 4718 | mejdrech | 91 | static inline void atomic_lock_arch(atomic_t *val) { |
| 92 | do { |
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| 93 | while (val->count) |
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| 94 | ; |
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| 95 | } while (test_and_set(val)); |
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| 96 | } |
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| 97 | |||
| 1 | jermar | 98 | #endif |
| 1702 | cejka | 99 | |
| 1769 | jermar | 100 | /** @} |
| 1702 | cejka | 101 | */ |