| 1 | /*
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| 2 | * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
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| 3 | * Use is subject to license terms.
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| 4 | */
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| 5 | /*
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| 6 | * \file drm_atomic.h
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| 7 | * Atomic operations used in the DRM which may or may not be provided by the OS.
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| 8 | *
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| 9 | * \author Eric Anholt <[email protected]>
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| 10 | */
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| 11 |
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| 12 | /*
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| 13 | * Copyright 2004 Eric Anholt
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| 14 | * All Rights Reserved.
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| 15 | *
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| 16 | * Permission is hereby granted, free of charge, to any person obtaining a
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| 17 | * copy of this software and associated documentation files (the "Software"),
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| 18 | * to deal in the Software without restriction, including without limitation
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| 19 | * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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| 20 | * and/or sell copies of the Software, and to permit persons to whom the
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| 21 | * Software is furnished to do so, subject to the following conditions:
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| 22 | *
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| 23 | * The above copyright notice and this permission notice (including the next
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| 24 | * paragraph) shall be included in all copies or substantial portions of the
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| 25 | * Software.
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| 26 | *
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| 27 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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| 28 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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| 29 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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| 30 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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| 31 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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| 32 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 33 | * OTHER DEALINGS IN THE SOFTWARE.
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| 34 | */
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| 35 |
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| 36 | /* Many of these implementations are rather fake, but good enough. */
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| 37 |
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| 38 |
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| 39 |
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| 40 | #ifndef _SYS_DRM_ATOMIC_H_
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| 41 | #define _SYS_DRM_ATOMIC_H_
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| 42 |
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| 43 | #ifdef __cplusplus
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| 44 | extern "C" {
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| 45 | #endif
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| 46 |
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| 47 | #include <sys/atomic.h>
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| 48 |
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| 49 | #ifdef __LINT__
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| 50 | #undef inline
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| 51 | #define inline
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| 52 | #endif
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| 53 | typedef uint32_t atomic_t;
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| 54 |
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| 55 | #define atomic_set(p, v) (*(p) = (v))
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| 56 | #define atomic_read(p) (*(p))
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| 57 | #define atomic_inc(p) atomic_add_int(p, 1)
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| 58 | #define atomic_dec(p) atomic_dec_uint(p)
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| 59 | #define atomic_add(n, p) atomic_add_int(p, n)
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| 60 | #define atomic_sub(n, p) atomic_dec_uint(p, n)
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| 61 | #define atomic_set_int(p, bits) atomic_or_uint(p, bits)
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| 62 | #define atomic_clear_int(p, bits) atomic_and_uint(p, ~(bits))
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| 63 | #define atomic_cmpset_int(p, c, n) \
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| 64 | ((c == atomic_cas_uint(p, c, n)) ? 1 : 0)
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| 65 |
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| 66 | #define set_bit(b, p) \
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| 67 | atomic_set_int(((volatile uint_t *)(void *)p) + (b >> 5), \
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| 68 | 1 << (b & 0x1f))
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| 69 |
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| 70 | #define clear_bit(b, p) \
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| 71 | atomic_clear_int(((volatile uint_t *)(void *)p) + (b >> 5), \
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| 72 | 1 << (b & 0x1f))
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| 73 |
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| 74 | #define test_bit(b, p) \
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| 75 | (((volatile uint_t *)(void *)p)[b >> 5] & (1 << (b & 0x1f)))
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| 76 |
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| 77 | /*
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| 78 | * Note: this routine doesn't return old value. It return
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| 79 | * 0 when succeeds, or -1 when fails.
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| 80 | */
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| 81 | #ifdef _LP64
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| 82 | #define test_and_set_bit(b, p) \
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| 83 | atomic_set_long_excl(((ulong_t *)(void *)p) + (b >> 6), (b & 0x3f))
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| 84 | #else
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| 85 | #define test_and_set_bit(b, p) \
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| 86 | atomic_set_long_excl(((ulong_t *)(void *)p) + (b >> 5), (b & 0x1f))
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| 87 | #endif
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| 88 |
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| 89 | #ifdef __cplusplus
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| 90 | }
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| 91 | #endif
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| 92 |
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| 93 | #endif /* _SYS_DRM_ATOMIC_H_ */
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