xref: /OK3568_Linux_fs/kernel/arch/openrisc/include/asm/bitops/ffs.h (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-or-later */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun  * OpenRISC Linux
4*4882a593Smuzhiyun  *
5*4882a593Smuzhiyun  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
6*4882a593Smuzhiyun  */
7*4882a593Smuzhiyun 
8*4882a593Smuzhiyun #ifndef __ASM_OPENRISC_FFS_H
9*4882a593Smuzhiyun #define __ASM_OPENRISC_FFS_H
10*4882a593Smuzhiyun 
11*4882a593Smuzhiyun #ifdef CONFIG_OPENRISC_HAVE_INST_FF1
12*4882a593Smuzhiyun 
ffs(int x)13*4882a593Smuzhiyun static inline int ffs(int x)
14*4882a593Smuzhiyun {
15*4882a593Smuzhiyun 	int ret;
16*4882a593Smuzhiyun 
17*4882a593Smuzhiyun 	__asm__ ("l.ff1 %0,%1"
18*4882a593Smuzhiyun 		 : "=r" (ret)
19*4882a593Smuzhiyun 		 : "r" (x));
20*4882a593Smuzhiyun 
21*4882a593Smuzhiyun 	return ret;
22*4882a593Smuzhiyun }
23*4882a593Smuzhiyun 
24*4882a593Smuzhiyun #else
25*4882a593Smuzhiyun #include <asm-generic/bitops/ffs.h>
26*4882a593Smuzhiyun #endif
27*4882a593Smuzhiyun 
28*4882a593Smuzhiyun #endif /* __ASM_OPENRISC_FFS_H */
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