mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-28 22:54:05 +08:00
d4337aa528
- remove {,test_and_}{set,clear,change}_bit()
- remove __{,test_and_}{set,clear,change}_bit() and test_bit()
- remove generic_fls64()
- remove find_{next,first}{,_zero}_bit()
- remove ext2_{set,clear,test,find_first_zero,find_next_zero}_bit()
- remove generic_hweight{32,16,8}()
- remove sched_find_first_bit()
- remove minix_{test,set,test_and_clear,test,find_first_zero}_bit()
Signed-off-by: Akinobu Mita <mita@miraclelinux.com>
Cc: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
124 lines
2.7 KiB
C
124 lines
2.7 KiB
C
/*
|
|
* include/asm-xtensa/bitops.h
|
|
*
|
|
* Atomic operations that C can't guarantee us.Useful for resource counting etc.
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2001 - 2005 Tensilica Inc.
|
|
*/
|
|
|
|
#ifndef _XTENSA_BITOPS_H
|
|
#define _XTENSA_BITOPS_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <asm/processor.h>
|
|
#include <asm/byteorder.h>
|
|
#include <asm/system.h>
|
|
|
|
#ifdef CONFIG_SMP
|
|
# error SMP not supported on this architecture
|
|
#endif
|
|
|
|
#define smp_mb__before_clear_bit() barrier()
|
|
#define smp_mb__after_clear_bit() barrier()
|
|
|
|
#include <asm-generic/bitops/atomic.h>
|
|
#include <asm-generic/bitops/non-atomic.h>
|
|
|
|
#if XCHAL_HAVE_NSA
|
|
|
|
static __inline__ int __cntlz (unsigned long x)
|
|
{
|
|
int lz;
|
|
asm ("nsau %0, %1" : "=r" (lz) : "r" (x));
|
|
return 31 - lz;
|
|
}
|
|
|
|
#else
|
|
|
|
static __inline__ int __cntlz (unsigned long x)
|
|
{
|
|
unsigned long sum, x1, x2, x4, x8, x16;
|
|
x1 = x & 0xAAAAAAAA;
|
|
x2 = x & 0xCCCCCCCC;
|
|
x4 = x & 0xF0F0F0F0;
|
|
x8 = x & 0xFF00FF00;
|
|
x16 = x & 0xFFFF0000;
|
|
sum = x2 ? 2 : 0;
|
|
sum += (x16 != 0) * 16;
|
|
sum += (x8 != 0) * 8;
|
|
sum += (x4 != 0) * 4;
|
|
sum += (x1 != 0);
|
|
|
|
return sum;
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* ffz: Find first zero in word. Undefined if no zero exists.
|
|
* bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
|
|
*/
|
|
|
|
static __inline__ int ffz(unsigned long x)
|
|
{
|
|
if ((x = ~x) == 0)
|
|
return 32;
|
|
return __cntlz(x & -x);
|
|
}
|
|
|
|
/*
|
|
* __ffs: Find first bit set in word. Return 0 for bit 0
|
|
*/
|
|
|
|
static __inline__ int __ffs(unsigned long x)
|
|
{
|
|
return __cntlz(x & -x);
|
|
}
|
|
|
|
/*
|
|
* ffs: Find first bit set in word. This is defined the same way as
|
|
* the libc and compiler builtin ffs routines, therefore
|
|
* differs in spirit from the above ffz (man ffs).
|
|
*/
|
|
|
|
static __inline__ int ffs(unsigned long x)
|
|
{
|
|
return __cntlz(x & -x) + 1;
|
|
}
|
|
|
|
/*
|
|
* fls: Find last (most-significant) bit set in word.
|
|
* Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
|
|
*/
|
|
|
|
static __inline__ int fls (unsigned int x)
|
|
{
|
|
return __cntlz(x);
|
|
}
|
|
#include <asm-generic/bitops/fls64.h>
|
|
#include <asm-generic/bitops/find.h>
|
|
#include <asm-generic/bitops/ext2-non-atomic.h>
|
|
|
|
#ifdef __XTENSA_EL__
|
|
# define ext2_set_bit_atomic(lock,nr,addr) test_and_set_bit((nr),(addr))
|
|
# define ext2_clear_bit_atomic(lock,nr,addr) test_and_clear_bit((nr),(addr))
|
|
#elif defined(__XTENSA_EB__)
|
|
# define ext2_set_bit_atomic(lock,nr,addr) test_and_set_bit((nr) ^ 0x18, (addr))
|
|
# define ext2_clear_bit_atomic(lock,nr,addr) test_and_clear_bit((nr)^0x18,(addr))
|
|
#else
|
|
# error processor byte order undefined!
|
|
#endif
|
|
|
|
#include <asm-generic/bitops/hweight.h>
|
|
#include <asm-generic/bitops/sched.h>
|
|
#include <asm-generic/bitops/minix.h>
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _XTENSA_BITOPS_H */
|