if_bwn_util.h

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    1 /*-
    2  * Copyright (c) 2016 Adrian Chadd <adrian@FreeBSD.org>.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer,
   10  *    without modification.
   11  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
   12  *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
   13  *    redistribution must be conditioned upon including a substantially
   14  *    similar Disclaimer requirement for further binary redistribution.
   15  *
   16  * NO WARRANTY
   17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   19  * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
   20  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
   21  * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
   22  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
   25  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   27  * THE POSSIBILITY OF SUCH DAMAGES.
   28  *
   29  * $FreeBSD$
   30  */
   31 #ifndef __IF_BWN_UTIL_H__
   32 #define __IF_BWN_UTIL_H__
   33 
   34 /* Hamming weight; used in the PHY routines */
   35 static inline int
   36 bwn_hweight32(uint32_t val)
   37 {
   38         int i, r = 0;
   39         /* yes, could do it without a loop.. */
   40         for (i = 0; i < 32; i++) {
   41                 r = r + (val & 1);
   42                 val = val >> 1;
   43         }
   44         return r;
   45 }
   46 
   47 /* Clamp value; PHY code */
   48 static inline int
   49 bwn_clamp_val(int val, int lo, int hi)
   50 {
   51         if (val < lo)
   52                 return lo;
   53         if (val > hi)
   54                 return hi;
   55         return val;
   56 }
   57 
   58 /* Q52 format - used in PHY routines */
   59 #define INT_TO_Q52(i)           ((i) << 2)
   60 #define Q52_TO_INT(q52)         ((q52) >> 2)
   61 #define Q52_FMT                 "%u.%u"
   62 #define Q52_ARG(q52)            Q52_TO_INT(q52), ((((q52) & 0x3) * 100) / 4)
   63 
   64 extern  unsigned int bwn_sqrt(struct bwn_mac *mac, unsigned int x);
   65 
   66 #endif  /* __IF_BWN_UTIL_H__ */

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FreeBSD/Linux Kernel Cross Reference sys/dev/bwn/if_bwn_util.h

FreeBSD/Linux Kernel Cross Reference
sys/dev/bwn/if_bwn_util.h