Differential D5794 Diff 21888 contrib/ofed/libmlx5/src/doorbell.h

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contrib/ofed/libmlx5/src/doorbell.h

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				/*
				* Copyright (c) 2012 Mellanox Technologies, Inc. All rights reserved.
				*
				* This software is available to you under a choice of one of two
				* licenses. You may choose to be licensed under the terms of the GNU
				* General Public License (GPL) Version 2, available from the file
				* COPYING in the main directory of this source tree, or the
				* OpenIB.org BSD license below:
				*
				* Redistribution and use in source and binary forms, with or
				* without modification, are permitted provided that the following
				* conditions are met:
				*
				* - Redistributions of source code must retain the above
				* copyright notice, this list of conditions and the following
				* disclaimer.
				*
				* - Redistributions in binary form must reproduce the above
				* copyright notice, this list of conditions and the following
				* disclaimer in the documentation and/or other materials
				* provided with the distribution.
				*
				* 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 THE AUTHORS OR COPYRIGHT HOLDERS
				* 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.
				*/


				#ifndef DOORBELL_H
				#define DOORBELL_H

				#if SIZEOF_LONG == 8

				#if __BYTE_ORDER == __LITTLE_ENDIAN
				# define MLX5_PAIR_TO_64(val) ((uint64_t) val[1] << 32 \| val[0])
				#elif __BYTE_ORDER == __BIG_ENDIAN
				# define MLX5_PAIR_TO_64(val) ((uint64_t) val[0] << 32 \| val[1])
				#else
				# error __BYTE_ORDER not defined
				#endif

				static inline void mlx5_write64(uint32_t val[2],
				void *dest,
				struct mlx5_lock *lock)
				{
				(volatile uint64_t )dest = MLX5_PAIR_TO_64(val);
				}

				#else

				static inline void mlx5_write64(uint32_t val[2],
				void *dest,
				struct mlx5_lock *lock)
				{
				mlx5_lock(lock);
				(volatile uint32_t )dest = val[0];
				(volatile uint32_t )(dest + 4) = val[1];
				mlx5_unlock(lock);
				}

				#endif

				#endif /* DOORBELL_H */