| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef __LINUX_BITS_H |
| 3 | #define __LINUX_BITS_H |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 4 | |
| 5 | #include <linux/const.h> |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 6 | #include <asm/bitsperlong.h> |
| 7 | |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 8 | #define BIT(nr) (UL(1) << (nr)) |
| 9 | #define BIT_ULL(nr) (ULL(1) << (nr)) |
| 10 | #define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG)) |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 11 | #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 12 | #define BIT_ULL_MASK(nr) (ULL(1) << ((nr) % BITS_PER_LONG_LONG)) |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 13 | #define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG) |
| 14 | #define BITS_PER_BYTE 8 |
| 15 | |
| 16 | /* |
| 17 | * Create a contiguous bitmask starting at bit position @l and ending at |
| 18 | * position @h. For example |
| 19 | * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000. |
| 20 | */ |
| 21 | #define GENMASK(h, l) \ |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 22 | (((~UL(0)) - (UL(1) << (l)) + 1) & \ |
| 23 | (~UL(0) >> (BITS_PER_LONG - 1 - (h)))) |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 24 | |
| 25 | #define GENMASK_ULL(h, l) \ |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 26 | (((~ULL(0)) - (ULL(1) << (l)) + 1) & \ |
| 27 | (~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h)))) |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 28 | |
| 29 | #endif /* __LINUX_BITS_H */ |