staging: brcm80211: Remove unnecessary bitfuncs.h

/*

 * Copyright (c) 2010 Broadcom Corporation

 *

 * Permission to use, copy, modify, and/or distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY

 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION

 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN

 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 */

#ifndef _BITFUNCS_H

#define _BITFUNCS_H

#include <typedefs.h>

/* local prototypes */

static inline uint32 find_msbit(uint32 x);

/*

 * find_msbit: returns index of most significant set bit in x, with index

 *   range defined as 0-31.  NOTE: returns zero if input is zero.

 */

#if defined(USE_PENTIUM_BSR) && defined(__GNUC__)

/*

 * Implementation for Pentium processors and gcc.  Note that this

 * instruction is actually very slow on some processors (e.g., family 5,

 * model 2, stepping 12, "Pentium 75 - 200"), so we use the generic

 * implementation instead.

 */

static inline uint32 find_msbit(uint32 x)

{

	uint msbit;

 __asm__("bsrl %1,%0" : "=r"(msbit)

 :		"r"(x));

	return msbit;

}

#else				/* !USE_PENTIUM_BSR || !__GNUC__ */

/*

 * Generic Implementation

 */

#define DB_POW_MASK16	0xffff0000

#define DB_POW_MASK8	0x0000ff00

#define DB_POW_MASK4	0x000000f0

#define DB_POW_MASK2	0x0000000c

#define DB_POW_MASK1	0x00000002

static inline uint32 find_msbit(uint32 x)

{

	uint32 temp_x = x;

	uint msbit = 0;

	if (temp_x & DB_POW_MASK16) {

		temp_x >>= 16;

		msbit = 16;

	}

	if (temp_x & DB_POW_MASK8) {

		temp_x >>= 8;

		msbit += 8;

	}

	if (temp_x & DB_POW_MASK4) {

		temp_x >>= 4;

		msbit += 4;

	}

	if (temp_x & DB_POW_MASK2) {

		temp_x >>= 2;

		msbit += 2;

	}

	if (temp_x & DB_POW_MASK1) {

		msbit += 1;

	}

	return msbit;

}

#endif				/* USE_PENTIUM_BSR && __GNUC__ */

#endif				/* _BITFUNCS_H */