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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 | #ifndef __mips32_ATOMIC_H__ |
29 | #ifndef __mips32_ATOMIC_H__ |
30 | #define __mips32_ATOMIC_H__ |
30 | #define __mips32_ATOMIC_H__ |
31 | 31 | ||
32 | #include <arch/types.h> |
32 | #include <arch/types.h> |
33 | 33 | ||
34 | #define atomic_inc(x) ((void) atomic_add(x, 1)) |
34 | #define atomic_inc(x) ((void) atomic_add(x, 1)) |
35 | #define atomic_dec(x) ((void) atomic_add(x, -1)) |
35 | #define atomic_dec(x) ((void) atomic_add(x, -1)) |
36 | 36 | ||
37 | #define atomic_inc_pre(x) (atomic_add(x, 1) - 1) |
37 | #define atomic_inc_pre(x) (atomic_add(x, 1) - 1) |
38 | #define atomic_dec_pre(x) (atomic_add(x, -1) + 1) |
38 | #define atomic_dec_pre(x) (atomic_add(x, -1) + 1) |
39 | 39 | ||
40 | #define atomic_inc_post(x) atomic_add(x, 1) |
40 | #define atomic_inc_post(x) atomic_add(x, 1) |
41 | #define atomic_dec_post(x) atomic_add(x, -1) |
41 | #define atomic_dec_post(x) atomic_add(x, -1) |
42 | 42 | ||
43 | 43 | ||
44 | typedef volatile __u32 atomic_t; |
44 | typedef volatile __u32 atomic_t; |
45 | 45 | ||
46 | /* Atomic addition of immediate value. |
46 | /* Atomic addition of immediate value. |
47 | * |
47 | * |
48 | * @param val Memory location to which will be the immediate value added. |
48 | * @param val Memory location to which will be the immediate value added. |
49 | * @param i Signed immediate that will be added to *val. |
49 | * @param i Signed immediate that will be added to *val. |
50 | * |
50 | * |
51 | * @return Value after addition. |
51 | * @return Value after addition. |
52 | */ |
52 | */ |
53 | static inline atomic_t atomic_add(atomic_t *val, int i) |
53 | static inline atomic_t atomic_add(atomic_t *val, int i) |
54 | { |
54 | { |
55 | atomic_t tmp, v; |
55 | atomic_t tmp, v; |
56 | 56 | ||
57 | __asm__ volatile ( |
57 | __asm__ volatile ( |
58 | "1:\n" |
58 | "1:\n" |
59 | " ll %0, %1\n" |
59 | " ll %0, %1\n" |
60 | " addiu %0, %0, %3\n" /* same as addi, but never traps on overflow */ |
60 | " addiu %0, %0, %3\n" /* same as addi, but never traps on overflow */ |
61 | " move %2, %0\n" |
61 | " move %2, %0\n" |
62 | " sc %0, %1\n" |
62 | " sc %0, %1\n" |
63 | " beq %0, %4, 1b\n" /* if the atomic operation failed, try again */ |
63 | " beq %0, %4, 1b\n" /* if the atomic operation failed, try again */ |
64 | /* nop */ /* nop is inserted automatically by compiler */ |
64 | /* nop */ /* nop is inserted automatically by compiler */ |
65 | : "=r" (tmp), "=m" (*val), "=r" (v) |
65 | : "=r" (tmp), "=m" (*val), "=r" (v) |
66 | : "i" (i), "i" (0) |
66 | : "i" (i), "i" (0) |
67 | ); |
67 | ); |
68 | 68 | ||
69 | return v; |
69 | return v; |
70 | } |
70 | } |
71 | 71 | ||
72 | 72 | ||
73 | #endif |
73 | #endif |
74 | 74 |