| /* Copyright (C) 2012 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by the GPL v2 license that can |
| * be found in the LICENSE file. |
| * |
| * Parts of this file are derived from the Linux kernel from the file with |
| * the same name and path under include/. |
| */ |
| #ifndef VERITY_INCLUDE_LINUX_BITOPS_H_ |
| #define VERITY_INCLUDE_LINUX_BITOPS_H_ |
| |
| #define BITS_PER_BYTE 8 |
| /* For verity, this is based on the compilation target and not |
| * CONFIG_64BIT. */ |
| #define BITS_PER_LONG (sizeof(long) * BITS_PER_BYTE) |
| |
| #define BIT(nr) (1UL << (nr)) |
| #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) |
| #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) |
| #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) |
| |
| #include <asm-generic/bitops/fls.h> |
| #include <strings.h> |
| #include <linux/types.h> |
| |
| /** |
| * rol32 - rotate a 32-bit value left |
| * @word: value to rotate |
| * @shift: bits to roll |
| */ |
| static inline __u32 rol32(__u32 word, unsigned int shift) { |
| return (word << shift) | (word >> (32 - shift)); |
| } |
| |
| /** |
| * ror32 - rotate a 32-bit value right |
| * @word: value to rotate |
| * @shift: bits to roll |
| */ |
| static inline __u32 ror32(__u32 word, unsigned int shift) { |
| return (word >> shift) | (word << (32 - shift)); |
| } |
| |
| #endif /* VERITY_INCLUDE_LINUX_BITOPS_H_ */ |
