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
  31 static 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__ */