LXR linux/arch/unicore32/include/asm/bitops.h

   1/*
   2 * linux/arch/unicore32/include/asm/bitops.h
   3 *
   4 * Code specific to PKUnity SoC and UniCore ISA
   5 *
   6 * Copyright (C) 2001-2010 GUAN Xue-tao
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12
  13#ifndef __UNICORE_BITOPS_H__
  14#define __UNICORE_BITOPS_H__
  15
  16#define find_next_bit           __uc32_find_next_bit
  17#define find_next_zero_bit      __uc32_find_next_zero_bit
  18
  19#define find_first_bit          __uc32_find_first_bit
  20#define find_first_zero_bit     __uc32_find_first_zero_bit
  21
  22#define _ASM_GENERIC_BITOPS_FLS_H_
  23#define _ASM_GENERIC_BITOPS___FLS_H_
  24#define _ASM_GENERIC_BITOPS_FFS_H_
  25#define _ASM_GENERIC_BITOPS___FFS_H_
  26/*
  27 * On UNICORE, those functions can be implemented around
  28 * the cntlz instruction for much better code efficiency.
  29 */
  30
  31static inline int fls(int x)
  32{
  33        int ret;
  34
  35        asm("cntlz\t%0, %1" : "=r" (ret) : "r" (x) : "cc");
  36        ret = 32 - ret;
  37
  38        return ret;
  39}
  40
  41#define __fls(x) (fls(x) - 1)
  42#define ffs(x) ({ unsigned long __t = (x); fls(__t & -__t); })
  43#define __ffs(x) (ffs(x) - 1)
  44
  45#include <asm-generic/bitops.h>
  46
  47#endif /* __UNICORE_BITOPS_H__ */
  48