| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __LINUX_BITS_H |
| #define __LINUX_BITS_H |
| |
| #include <linux/const.h> |
| #include <asm/bitsperlong.h> |
| |
| #define BIT(nr) (UL(1) << (nr)) |
| #define BIT_ULL(nr) (ULL(1) << (nr)) |
| #define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG)) |
| #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) |
| #define BIT_ULL_MASK(nr) (ULL(1) << ((nr) % BITS_PER_LONG_LONG)) |
| #define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG) |
| #define BITS_PER_BYTE 8 |
| |
| /* |
| * Create a contiguous bitmask starting at bit position @l and ending at |
| * position @h. For example |
| * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000. |
| */ |
| #define GENMASK(h, l) \ |
| (((~UL(0)) - (UL(1) << (l)) + 1) & \ |
| (~UL(0) >> (BITS_PER_LONG - 1 - (h)))) |
| |
| #define GENMASK_ULL(h, l) \ |
| (((~ULL(0)) - (ULL(1) << (l)) + 1) & \ |
| (~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h)))) |
| |
| #endif /* __LINUX_BITS_H */ |
