forked from Minki/linux
61f2e7b0f4
minix bit operations are only used by minix filesystem and useless by other modules. Because byte order of inode and block bitmaps is different on each architecture like below: m68k: big-endian 16bit indexed bitmaps h8300, microblaze, s390, sparc, m68knommu: big-endian 32 or 64bit indexed bitmaps m32r, mips, sh, xtensa: big-endian 32 or 64bit indexed bitmaps for big-endian mode little-endian bitmaps for little-endian mode Others: little-endian bitmaps In order to move minix bit operations from asm/bitops.h to architecture independent code in minix filesystem, this provides two config options. CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED is only selected by m68k. CONFIG_MINIX_FS_NATIVE_ENDIAN is selected by the architectures which use native byte order bitmaps (h8300, microblaze, s390, sparc, m68knommu, m32r, mips, sh, xtensa). The architectures which always use little-endian bitmaps do not select these options. Finally, we can remove minix bit operations from asm/bitops.h for all architectures. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Greg Ungerer <gerg@uclinux.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Andreas Schwab <schwab@linux-m68k.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Michal Simek <monstr@monstr.eu> Cc: "David S. Miller" <davem@davemloft.net> Cc: Hirokazu Takata <takata@linux-m32r.org> Acked-by: Ralf Baechle <ralf@linux-mips.org> Acked-by: Paul Mundt <lethal@linux-sh.org> Cc: Chris Zankel <chris@zankel.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
128 lines
3.1 KiB
C
128 lines
3.1 KiB
C
/*
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* Copyright 1992, Linus Torvalds.
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#ifndef _ASM_TILE_BITOPS_H
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#define _ASM_TILE_BITOPS_H
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#include <linux/types.h>
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#ifndef _LINUX_BITOPS_H
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#error only <linux/bitops.h> can be included directly
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#endif
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#ifdef __tilegx__
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#include <asm/bitops_64.h>
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#else
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#include <asm/bitops_32.h>
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#endif
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/**
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* __ffs - find first set bit in word
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* @word: The word to search
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*
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* Undefined if no set bit exists, so code should check against 0 first.
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*/
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static inline unsigned long __ffs(unsigned long word)
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{
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return __builtin_ctzl(word);
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}
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/**
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* ffz - find first zero bit in word
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* @word: The word to search
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*
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* Undefined if no zero exists, so code should check against ~0UL first.
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*/
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static inline unsigned long ffz(unsigned long word)
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{
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return __builtin_ctzl(~word);
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}
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/**
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* __fls - find last set bit in word
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* @word: The word to search
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*
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* Undefined if no set bit exists, so code should check against 0 first.
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*/
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static inline unsigned long __fls(unsigned long word)
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{
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return (sizeof(word) * 8) - 1 - __builtin_clzl(word);
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}
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/**
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* ffs - find first set bit in word
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* @x: the word to search
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*
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* This is defined the same way as the libc and compiler builtin ffs
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* routines, therefore differs in spirit from the other bitops.
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*
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* ffs(value) returns 0 if value is 0 or the position of the first
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* set bit if value is nonzero. The first (least significant) bit
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* is at position 1.
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*/
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static inline int ffs(int x)
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{
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return __builtin_ffs(x);
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}
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/**
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* fls - find last set bit in word
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* @x: the word to search
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*
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* This is defined in a similar way as the libc and compiler builtin
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* ffs, but returns the position of the most significant set bit.
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*
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* fls(value) returns 0 if value is 0 or the position of the last
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* set bit if value is nonzero. The last (most significant) bit is
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* at position 32.
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*/
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static inline int fls(int x)
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{
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return (sizeof(int) * 8) - __builtin_clz(x);
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}
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static inline int fls64(__u64 w)
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{
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return (sizeof(__u64) * 8) - __builtin_clzll(w);
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}
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static inline unsigned int __arch_hweight32(unsigned int w)
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{
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return __builtin_popcount(w);
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}
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static inline unsigned int __arch_hweight16(unsigned int w)
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{
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return __builtin_popcount(w & 0xffff);
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}
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static inline unsigned int __arch_hweight8(unsigned int w)
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{
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return __builtin_popcount(w & 0xff);
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}
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static inline unsigned long __arch_hweight64(__u64 w)
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{
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return __builtin_popcountll(w);
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}
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#include <asm-generic/bitops/const_hweight.h>
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#include <asm-generic/bitops/lock.h>
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#include <asm-generic/bitops/find.h>
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#include <asm-generic/bitops/sched.h>
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#include <asm-generic/bitops/le.h>
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#endif /* _ASM_TILE_BITOPS_H */
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