cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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xfs_bit.h (1577B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
      4 * All Rights Reserved.
      5 */
      6#ifndef __XFS_BIT_H__
      7#define	__XFS_BIT_H__
      8
      9/*
     10 * XFS bit manipulation routines.
     11 */
     12
     13/*
     14 * masks with n high/low bits set, 64-bit values
     15 */
     16static inline uint64_t xfs_mask64hi(int n)
     17{
     18	return (uint64_t)-1 << (64 - (n));
     19}
     20static inline uint32_t xfs_mask32lo(int n)
     21{
     22	return ((uint32_t)1 << (n)) - 1;
     23}
     24static inline uint64_t xfs_mask64lo(int n)
     25{
     26	return ((uint64_t)1 << (n)) - 1;
     27}
     28
     29/* Get high bit set out of 32-bit argument, -1 if none set */
     30static inline int xfs_highbit32(uint32_t v)
     31{
     32	return fls(v) - 1;
     33}
     34
     35/* Get high bit set out of 64-bit argument, -1 if none set */
     36static inline int xfs_highbit64(uint64_t v)
     37{
     38	return fls64(v) - 1;
     39}
     40
     41/* Get low bit set out of 32-bit argument, -1 if none set */
     42static inline int xfs_lowbit32(uint32_t v)
     43{
     44	return ffs(v) - 1;
     45}
     46
     47/* Get low bit set out of 64-bit argument, -1 if none set */
     48static inline int xfs_lowbit64(uint64_t v)
     49{
     50	uint32_t	w = (uint32_t)v;
     51	int		n = 0;
     52
     53	if (w) {	/* lower bits */
     54		n = ffs(w);
     55	} else {	/* upper bits */
     56		w = (uint32_t)(v >> 32);
     57		if (w) {
     58			n = ffs(w);
     59			if (n)
     60				n += 32;
     61		}
     62	}
     63	return n - 1;
     64}
     65
     66/* Return whether bitmap is empty (1 == empty) */
     67extern int xfs_bitmap_empty(uint *map, uint size);
     68
     69/* Count continuous one bits in map starting with start_bit */
     70extern int xfs_contig_bits(uint *map, uint size, uint start_bit);
     71
     72/* Find next set bit in map */
     73extern int xfs_next_bit(uint *map, uint size, uint start_bit);
     74
     75#endif	/* __XFS_BIT_H__ */