| /* |
| * linux/arch/unicore32/include/asm/bitops.h |
| * |
| * Code specific to PKUnity SoC and UniCore ISA |
| * |
| * Copyright (C) 2001-2010 GUAN Xue-tao |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #ifndef __UNICORE_BITOPS_H__ |
| #define __UNICORE_BITOPS_H__ |
| |
| #define _ASM_GENERIC_BITOPS_FLS_H_ |
| #define _ASM_GENERIC_BITOPS___FLS_H_ |
| #define _ASM_GENERIC_BITOPS_FFS_H_ |
| #define _ASM_GENERIC_BITOPS___FFS_H_ |
| /* |
| * On UNICORE, those functions can be implemented around |
| * the cntlz instruction for much better code efficiency. |
| */ |
| |
| static inline int fls(unsigned int x) |
| { |
| int ret; |
| |
| asm("cntlz\t%0, %1" : "=r" (ret) : "r" (x) : "cc"); |
| ret = 32 - ret; |
| |
| return ret; |
| } |
| |
| #define __fls(x) (fls(x) - 1) |
| #define ffs(x) ({ unsigned long __t = (x); fls(__t & -__t); }) |
| #define __ffs(x) (ffs(x) - 1) |
| |
| #include <asm-generic/bitops.h> |
| |
| /* following definitions: to avoid using codes in lib/find_*.c */ |
| #define find_next_bit find_next_bit |
| #define find_next_zero_bit find_next_zero_bit |
| #define find_first_bit find_first_bit |
| #define find_first_zero_bit find_first_zero_bit |
| |
| #include <asm-generic/bitops/find.h> |
| |
| #endif /* __UNICORE_BITOPS_H__ */ |
