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46 lines
1.4 KiB
46 lines
1.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __LINUX_BITS_H |
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#define __LINUX_BITS_H |
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#include <linux/const.h> |
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#include <vdso/bits.h> |
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#include <asm/bitsperlong.h> |
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#define BIT_ULL(nr) (ULL(1) << (nr)) |
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#define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG)) |
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#define BIT_WORD(nr) ((nr) / BITS_PER_LONG) |
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#define BIT_ULL_MASK(nr) (ULL(1) << ((nr) % BITS_PER_LONG_LONG)) |
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#define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG) |
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#define BITS_PER_BYTE 8 |
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/* |
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* Create a contiguous bitmask starting at bit position @l and ending at |
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* position @h. For example |
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* GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000. |
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*/ |
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#if !defined(__ASSEMBLY__) |
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#include <linux/build_bug.h> |
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#define GENMASK_INPUT_CHECK(h, l) \ |
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(BUILD_BUG_ON_ZERO(__builtin_choose_expr( \ |
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__is_constexpr((l) > (h)), (l) > (h), 0))) |
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#else |
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/* |
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* BUILD_BUG_ON_ZERO is not available in h files included from asm files, |
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* disable the input check if that is the case. |
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*/ |
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#define GENMASK_INPUT_CHECK(h, l) 0 |
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#endif |
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#define __GENMASK(h, l) \ |
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(((~UL(0)) - (UL(1) << (l)) + 1) & \ |
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(~UL(0) >> (BITS_PER_LONG - 1 - (h)))) |
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#define GENMASK(h, l) \ |
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(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) |
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#define __GENMASK_ULL(h, l) \ |
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(((~ULL(0)) - (ULL(1) << (l)) + 1) & \ |
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(~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h)))) |
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#define GENMASK_ULL(h, l) \ |
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(GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l)) |
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#endif /* __LINUX_BITS_H */
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