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 _ASM_GENERIC_BITOPS_FLS_H_
  17 #define _ASM_GENERIC_BITOPS___FLS_H_
  18 #define _ASM_GENERIC_BITOPS_FFS_H_
  19 #define _ASM_GENERIC_BITOPS___FFS_H_
  20 /*
  21  * On UNICORE, those functions can be implemented around
  22  * the cntlz instruction for much better code efficiency.
  23  */
  24
  25 static inline int fls(int x)
  26 {
  27         int ret;
  28
  29         asm("cntlz\t%0, %1" : "=r" (ret) : "r" (x) : "cc");
  30         ret = 32 - ret;
  31
  32         return ret;
  33 }
  34
  35 #define __fls(x) (fls(x) - 1)
  36 #define ffs(x) ({ unsigned long __t = (x); fls(__t & -__t); })
  37 #define __ffs(x) (ffs(x) - 1)
  38
  39 #include <asm-generic/bitops.h>
  40
  41 /* following definitions: to avoid using codes in lib/find_*.c */
  42 #define find_next_bit           find_next_bit
  43 #define find_next_zero_bit      find_next_zero_bit
  44 #define find_first_bit          find_first_bit
  45 #define find_first_zero_bit     find_first_zero_bit
  46
  47 #endif /* __UNICORE_BITOPS_H__ */