GuanXuetao | 96cf518 | 2011-01-15 18:23:09 +0800 | [diff] [blame] | 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 | |
GuanXuetao | 96cf518 | 2011-01-15 18:23:09 +0800 | [diff] [blame] | 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 | |
Guan Xuetao | e13b91c | 2011-06-13 11:44:49 +0800 | [diff] [blame] | 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 | |
GuanXuetao | 96cf518 | 2011-01-15 18:23:09 +0800 | [diff] [blame] | 47 | #endif /* __UNICORE_BITOPS_H__ */ |