Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 find_next_bit __uc32_find_next_bit
17#define find_next_zero_bit __uc32_find_next_zero_bit
18
19#define find_first_bit __uc32_find_first_bit
20#define find_first_zero_bit __uc32_find_first_zero_bit
21
22#define _ASM_GENERIC_BITOPS_FLS_H_
23#define _ASM_GENERIC_BITOPS___FLS_H_
24#define _ASM_GENERIC_BITOPS_FFS_H_
25#define _ASM_GENERIC_BITOPS___FFS_H_
26/*
27 * On UNICORE, those functions can be implemented around
28 * the cntlz instruction for much better code efficiency.
29 */
30
31static inline int fls(int x)
32{
33 int ret;
34
35 asm("cntlz\t%0, %1" : "=r" (ret) : "r" (x) : "cc");
36 ret = 32 - ret;
37
38 return ret;
39}
40
41#define __fls(x) (fls(x) - 1)
42#define ffs(x) ({ unsigned long __t = (x); fls(__t & -__t); })
43#define __ffs(x) (ffs(x) - 1)
44
45#include <asm-generic/bitops.h>
46
47#endif /* __UNICORE_BITOPS_H__ */