diff options
| author | Jinjie Ruan <ruanjinjie@huawei.com> | 2026-05-06 13:52:04 -0400 |
|---|---|---|
| committer | Yury Norov <ynorov@nvidia.com> | 2026-05-28 11:39:16 -0400 |
| commit | 83aede8131afa99b26034f81fe77181eba38b0c2 (patch) | |
| tree | e3f8cbdbe70f8d5e9f143f1e0962e4d0aa0c05a8 /include/asm-generic/bitops | |
| parent | 00751d655ece97fe85ce9193542ee8396fe98651 (diff) | |
bitops: Define generic___bitrev8/16/32 for reuse
Define generic___bitrev8/16/32 using the implementation in
<linux/bitrev.h>, so they can be reused in <asm/bitrev.h>,
such as RISCV.
Reviewed-by: Yury Norov <ynorov@nvidia.com>
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Signed-off-by: Yury Norov <ynorov@nvidia.com>
Diffstat (limited to 'include/asm-generic/bitops')
| -rw-r--r-- | include/asm-generic/bitops/__bitrev.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/include/asm-generic/bitops/__bitrev.h b/include/asm-generic/bitops/__bitrev.h new file mode 100644 index 000000000000..4addbde14050 --- /dev/null +++ b/include/asm-generic/bitops/__bitrev.h @@ -0,0 +1,23 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_GENERIC_BITOPS___BITREV_H_ +#define _ASM_GENERIC_BITOPS___BITREV_H_ + +#include <asm/types.h> + +extern u8 const byte_rev_table[256]; +static __always_inline __attribute_const__ u8 generic___bitrev8(u8 byte) +{ + return byte_rev_table[byte]; +} + +static __always_inline __attribute_const__ u16 generic___bitrev16(u16 x) +{ + return (generic___bitrev8(x & 0xff) << 8) | generic___bitrev8(x >> 8); +} + +static __always_inline __attribute_const__ u32 generic___bitrev32(u32 x) +{ + return (generic___bitrev16(x & 0xffff) << 16) | generic___bitrev16(x >> 16); +} + +#endif /* _ASM_GENERIC_BITOPS___BITREV_H_ */ |