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/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* \file drm_atomic.h
* Atomic operations used in the DRM which may or may not be provided by the OS.
*
* \author Eric Anholt <anholt@FreeBSD.org>
*/
/*
* Copyright 2004 Eric Anholt
* Copyright (c) 2009, Intel Corporation.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/* Many of these implementations are rather fake, but good enough. */
#ifndef _SYS_DRM_ATOMIC_H_
#define _SYS_DRM_ATOMIC_H_
#ifdef __cplusplus
extern "C" {
#endif
#include <sys/atomic.h>
#ifdef __LINT__
#undef inline
#define inline
#endif
typedef uint32_t atomic_t;
#define atomic_set(p, v) (*(p) = (v))
#define atomic_read(p) (*(p))
#define atomic_inc(p) atomic_inc_uint(p)
#define atomic_dec(p) atomic_dec_uint(p)
#define atomic_add(n, p) atomic_add_int(p, n)
#define atomic_sub(n, p) atomic_add_int(p, -n)
#define atomic_set_int(p, bits) atomic_or_uint(p, bits)
#define atomic_clear_int(p, bits) atomic_and_uint(p, ~(bits))
#define atomic_cmpset_int(p, c, n) \
((c == atomic_cas_uint(p, c, n)) ? 1 : 0)
#define set_bit(b, p) \
atomic_set_int(((volatile uint_t *)(void *)p) + (b >> 5), \
1 << (b & 0x1f))
#define clear_bit(b, p) \
atomic_clear_int(((volatile uint_t *)(void *)p) + (b >> 5), \
1 << (b & 0x1f))
#define test_bit(b, p) \
(((volatile uint_t *)(void *)p)[b >> 5] & (1 << (b & 0x1f)))
/*
* Note: this routine doesn't return old value. It return
* 0 when succeeds, or -1 when fails.
*/
#ifdef _LP64
#define test_and_set_bit(b, p) \
atomic_set_long_excl(((ulong_t *)(void *)p) + (b >> 6), (b & 0x3f))
#else
#define test_and_set_bit(b, p) \
atomic_set_long_excl(((ulong_t *)(void *)p) + (b >> 5), (b & 0x1f))
#endif
#ifdef __cplusplus
}
#endif
#endif /* _SYS_DRM_ATOMIC_H_ */
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