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TOMOYO Linux Cross Reference
Linux/include/linux/bits.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef __LINUX_BITS_H
  3 #define __LINUX_BITS_H
  4 
  5 #include <linux/const.h>
  6 #include <vdso/bits.h>
  7 #include <asm/bitsperlong.h>
  8 
  9 #define BIT_ULL(nr)             (ULL(1) << (nr))
 10 #define BIT_MASK(nr)            (UL(1) << ((nr) % BITS_PER_LONG))
 11 #define BIT_WORD(nr)            ((nr) / BITS_PER_LONG)
 12 #define BIT_ULL_MASK(nr)        (ULL(1) << ((nr) % BITS_PER_LONG_LONG))
 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 #if !defined(__ASSEMBLY__)
 22 #include <linux/build_bug.h>
 23 #define GENMASK_INPUT_CHECK(h, l) \
 24         (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \
 25                 __is_constexpr((l) > (h)), (l) > (h), 0)))
 26 #else
 27 /*
 28  * BUILD_BUG_ON_ZERO is not available in h files included from asm files,
 29  * disable the input check if that is the case.
 30  */
 31 #define GENMASK_INPUT_CHECK(h, l) 0
 32 #endif
 33 
 34 #define __GENMASK(h, l) \
 35         (((~UL(0)) - (UL(1) << (l)) + 1) & \
 36          (~UL(0) >> (BITS_PER_LONG - 1 - (h))))
 37 #define GENMASK(h, l) \
 38         (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
 39 
 40 #define __GENMASK_ULL(h, l) \
 41         (((~ULL(0)) - (ULL(1) << (l)) + 1) & \
 42          (~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h))))
 43 #define GENMASK_ULL(h, l) \
 44         (GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l))
 45 
 46 #endif  /* __LINUX_BITS_H */
 47 

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