1 /* Copyright (C) 2011-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <http://www.gnu.org/licenses/>. */
19 #ifndef _BITS_ATOMIC_H
20 #define _BITS_ATOMIC_H 1
22 #include <asm/unistd.h>
24 /* 32-bit integer compare-and-exchange. */
25 static __inline __attribute__ ((always_inline))
26 int __atomic_cmpxchg_32 (volatile int *mem, int newval, int oldval)
29 __asm__ __volatile__ ("swint1"
30 : "=R00" (result), "=m" (*mem)
31 : "R10" (__NR_FAST_cmpxchg), "R00" (mem),
32 "R01" (oldval), "R02" (newval), "m" (*mem)
33 : "r20", "r21", "r22", "r23", "r24",
34 "r25", "r26", "r27", "r28", "r29", "memory");
38 #define atomic_compare_and_exchange_val_acq(mem, n, o) \
39 ((__typeof (*(mem))) \
40 ((sizeof (*(mem)) == 4) ? \
41 __atomic_cmpxchg_32 ((int *) (mem), (int) (n), (int) (o)) : \
42 __atomic_error_bad_argument_size()))
44 /* Atomically compute:
46 *ptr = (old & mask) + addend;
49 static __inline __attribute__ ((always_inline))
50 int __atomic_update_32 (volatile int *mem, int mask, int addend)
53 __asm__ __volatile__ ("swint1"
54 : "=R00" (result), "=m" (*mem)
55 : "R10" (__NR_FAST_atomic_update), "R00" (mem),
56 "R01" (mask), "R02" (addend), "m" (*mem)
57 : "r20", "r21", "r22", "r23", "r24",
58 "r25", "r26", "r27", "r28", "r29", "memory");
62 /* Size-checked verson of __atomic_update_32. */
63 #define __atomic_update(mem, mask, addend) \
64 ((__typeof (*(mem))) \
65 ((sizeof (*(mem)) == 4) ? \
66 __atomic_update_32 ((int *) (mem), (int) (mask), (int) (addend)) : \
67 __atomic_error_bad_argument_size ()))
69 #define atomic_exchange_acq(mem, newvalue) \
70 __atomic_update ((mem), 0, (newvalue))
71 #define atomic_exchange_and_add(mem, value) \
72 __atomic_update ((mem), -1, (value))
73 #define atomic_and_val(mem, mask) \
74 __atomic_update ((mem), (mask), 0)
75 #define atomic_or_val(mem, mask) \
76 ({ __typeof (mask) __att1_v = (mask); \
77 __atomic_update ((mem), ~__att1_v, __att1_v); })
79 #include <sysdeps/tile/bits/atomic.h>
81 #endif /* bits/atomic.h */