bitops.h
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/*
* Port on Texas Instruments TMS320C6x architecture
*
* Copyright (C) 2004, 2009, 2010 Texas Instruments Incorporated
* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _ASM_C6X_BITOPS_H
#define _ASM_C6X_BITOPS_H
#ifdef __KERNEL__
#include <linux/bitops.h>
#include <asm/byteorder.h>
#include <asm/barrier.h>
/*
* We are lucky, DSP is perfect for bitops: do it in 3 cycles
*/
/**
* __ffs - find first bit in word.
* @word: The word to search
*
* Undefined if no bit exists, so code should check against 0 first.
* Note __ffs(0) = undef, __ffs(1) = 0, __ffs(0x80000000) = 31.
*
*/
static inline unsigned long __ffs(unsigned long x)
{
asm (" bitr .M1 %0,%0\n"
" nop\n"
" lmbd .L1 1,%0,%0\n"
: "+a"(x));
return x;
}
/*
* ffz - find first zero in word.
* @word: The word to search
*
* Undefined if no zero exists, so code should check against ~0UL first.
*/
#define ffz(x) __ffs(~(x))
/**
* fls - find last (most-significant) bit set
* @x: the word to search
*
* This is defined the same way as ffs.
* Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
*/
static inline int fls(int x)
{
if (!x)
return 0;
asm (" lmbd .L1 1,%0,%0\n" : "+a"(x));
return 32 - x;
}
/**
* ffs - find first bit set
* @x: the word to search
*
* This is defined the same way as
* the libc and compiler builtin ffs routines, therefore
* differs in spirit from the above ffz (man ffs).
* Note ffs(0) = 0, ffs(1) = 1, ffs(0x80000000) = 32.
*/
static inline int ffs(int x)
{
if (!x)
return 0;
return __ffs(x) + 1;
}
#include <asm-generic/bitops/__fls.h>
#include <asm-generic/bitops/fls64.h>
#include <asm-generic/bitops/find.h>
#include <asm-generic/bitops/sched.h>
#include <asm-generic/bitops/hweight.h>
#include <asm-generic/bitops/lock.h>
#include <asm-generic/bitops/atomic.h>
#include <asm-generic/bitops/non-atomic.h>
#include <asm-generic/bitops/le.h>
#include <asm-generic/bitops/ext2-atomic.h>
#endif /* __KERNEL__ */
#endif /* _ASM_C6X_BITOPS_H */