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