1450N/A/*
1450N/A * Copyright (c) 2006, 2015, Oracle and/or its affiliates. All rights reserved.
1450N/A */
1450N/A
1450N/A/*
1450N/A * \file drm_atomic.h
1450N/A * Atomic operations used in the DRM which may or may not be provided by the OS.
1450N/A *
1450N/A * \author Eric Anholt <anholt@FreeBSD.org>
1450N/A */
1450N/A
1450N/A/*
1450N/A * Copyright 2004 Eric Anholt
1450N/A * Copyright (c) 2009, 2012, Intel Corporation.
1450N/A * All Rights Reserved.
1450N/A *
1450N/A * Permission is hereby granted, free of charge, to any person obtaining a
1450N/A * copy of this software and associated documentation files (the "Software"),
1450N/A * to deal in the Software without restriction, including without limitation
1450N/A * the rights to use, copy, modify, merge, publish, distribute, sublicense,
1450N/A * and/or sell copies of the Software, and to permit persons to whom the
1450N/A * Software is furnished to do so, subject to the following conditions:
1450N/A *
1450N/A * The above copyright notice and this permission notice (including the next
1450N/A * paragraph) shall be included in all copies or substantial portions of the
1450N/A * Software.
1450N/A *
1450N/A * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
1450N/A * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
1450N/A * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
1450N/A * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
1450N/A * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
1450N/A * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
1450N/A * OTHER DEALINGS IN THE SOFTWARE.
1450N/A */
1450N/A
1450N/A/* Many of these implementations are rather fake, but good enough. */
1450N/A
1450N/A
1450N/A
1450N/A#ifndef _SYS_DRM_ATOMIC_H_
1450N/A#define _SYS_DRM_ATOMIC_H_
1450N/A
1450N/A#ifdef __cplusplus
1450N/Aextern "C" {
1450N/A#endif
1450N/A
1450N/A#include <sys/atomic.h>
1450N/A
1450N/A#ifdef __LINT__
1450N/A#undef inline
1450N/A#define inline
1450N/A#endif
1450N/Atypedef uint32_t atomic_t;
1450N/A
1450N/A#define atomic_set(p, v) (*(p) = (v))
1450N/A#define atomic_read(p) (*(p))
1450N/A#define atomic_inc(p) atomic_add_int(p, 1)
1450N/A#define atomic_dec(p) atomic_dec_uint(p)
1450N/A#define atomic_dec_and_test(p) \
1450N/A ((0 == atomic_dec_32_nv(p)) ? 1 : 0)
1450N/A#define atomic_add(n, p) atomic_add_int(p, n)
1450N/A#define atomic_add_return(n, p) (atomic_add_int(p, n), *p)
1450N/A#define atomic_sub(n, p) atomic_add_int(p, -n)
1450N/A#define atomic_set_int(p, bits) atomic_or_uint(p, bits)
1450N/A#define atomic_clear_int(p, bits) atomic_and_uint(p, ~(bits))
1450N/A#define atomic_cmpset_int(p, c, n) \
1450N/A ((c == atomic_cas_uint(p, c, n)) ? 1 : 0)
1450N/A#define atomic_clear_mask(mask, p) (*(p) &= ~mask)
1450N/A#define atomic_set_mask(mask, p) (*(p) |= mask)
1450N/A#define atomic_inc_not_zero(p) \
1450N/A if (atomic_read(p) != 0) \
1450N/A atomic_inc(p);
1450N/A
1450N/A#define set_bit(b, p) \
1450N/A atomic_set_int(((volatile uint_t *)(void *)p) + (b >> 5), \
1450N/A 1 << (b & 0x1f))
1450N/A
1450N/A#define clear_bit(b, p) \
1450N/A atomic_clear_int(((volatile uint_t *)(void *)p) + (b >> 5), \
1450N/A 1 << (b & 0x1f))
1450N/A
1450N/A#define test_bit(b, p) \
1450N/A (((volatile uint_t *)(void *)p)[b >> 5] & (1 << (b & 0x1f)))
1450N/A
1450N/A/*
1450N/A * Note: this routine doesn't return old value. It return
1450N/A * 0 when succeeds, or -1 when fails.
1450N/A */
1450N/A#ifdef _LP64
1450N/A#define test_and_set_bit(b, p) \
1450N/A atomic_set_long_excl(((ulong_t *)(void *)p) + (b >> 6), (b & 0x3f))
1450N/A#else
1450N/A#define test_and_set_bit(b, p) \
1450N/A atomic_set_long_excl(((ulong_t *)(void *)p) + (b >> 5), (b & 0x1f))
1450N/A#endif
1450N/A
1450N/A#ifdef __cplusplus
1450N/A}
1450N/A#endif
1450N/A
1450N/A#endif /* _SYS_DRM_ATOMIC_H_ */