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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 
fls(int x)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__ */
48