projects / mirror_ubuntu-jammy-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| d2912cb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 96cf5185 G |
2 | /* |
| 3 | * linux/arch/unicore32/include/asm/bitops.h | |
| 4 | * | |
| 5 | * Code specific to PKUnity SoC and UniCore ISA | |
| 6 | * | |
| 7 | * Copyright (C) 2001-2010 GUAN Xue-tao | |
| 96cf5185 G |
8 | */ |
| 9 | ||
| 10 | #ifndef __UNICORE_BITOPS_H__ | |
| 11 | #define __UNICORE_BITOPS_H__ | |
| 12 | ||
| 96cf5185 G |
13 | #define _ASM_GENERIC_BITOPS_FLS_H_ |
| 14 | #define _ASM_GENERIC_BITOPS___FLS_H_ | |
| 15 | #define _ASM_GENERIC_BITOPS_FFS_H_ | |
| 16 | #define _ASM_GENERIC_BITOPS___FFS_H_ | |
| 17 | /* | |
| 18 | * On UNICORE, those functions can be implemented around | |
| 19 | * the cntlz instruction for much better code efficiency. | |
| 20 | */ | |
| 21 | ||
| 3fc2579e | 22 | static inline int fls(unsigned int x) |
| 96cf5185 G |
23 | { |
| 24 | int ret; | |
| 25 | ||
| 26 | asm("cntlz\t%0, %1" : "=r" (ret) : "r" (x) : "cc"); | |
| 27 | ret = 32 - ret; | |
| 28 | ||
| 29 | return ret; | |
| 30 | } | |
| 31 | ||
| 32 | #define __fls(x) (fls(x) - 1) | |
| 33 | #define ffs(x) ({ unsigned long __t = (x); fls(__t & -__t); }) | |
| 34 | #define __ffs(x) (ffs(x) - 1) | |
| 35 | ||
| 36 | #include <asm-generic/bitops.h> | |
| 37 | ||
| e13b91c1 GX |
38 | /* following definitions: to avoid using codes in lib/find_*.c */ |
| 39 | #define find_next_bit find_next_bit | |
| 40 | #define find_next_zero_bit find_next_zero_bit | |
| 41 | #define find_first_bit find_first_bit | |
| 42 | #define find_first_zero_bit find_first_zero_bit | |
| 43 | ||
| 0ade34c3 CC |
44 | #include <asm-generic/bitops/find.h> |
| 45 | ||
| 96cf5185 | 46 | #endif /* __UNICORE_BITOPS_H__ */ |