mirror of
https://github.com/freebsd/freebsd-src
synced 2024-07-22 10:48:02 +00:00
46 lines
1.9 KiB
C
46 lines
1.9 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* Copyright (c) 2020 Advanced Micro Devices, Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* Contact Information :
|
|
* Rajesh Kumar <rajesh1.kumar@amd.com>
|
|
*
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#include "xgbe.h"
|
|
#include "xgbe_osdep.h"
|
|
|
|
/* Bit Reversal - http://aggregate.org/MAGIC/#Bit%20Reversal */
|
|
uint32_t bitrev32(uint32_t x)
|
|
{
|
|
x = (((x & 0xaaaaaaaa) >> 1) | ((x & 0x55555555) << 1));
|
|
x = (((x & 0xcccccccc) >> 2) | ((x & 0x33333333) << 2));
|
|
x = (((x & 0xf0f0f0f0) >> 4) | ((x & 0x0f0f0f0f) << 4));
|
|
x = (((x & 0xff00ff00) >> 8) | ((x & 0x00ff00ff) << 8));
|
|
|
|
return ((x >> 16) | (x << 16));
|
|
}
|