/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright ( C ) 2004 , 2007 - 2010 , 2011 - 2012 Synopsys , Inc . ( www . synopsys . com )
*/
#ifndef _ASM_BITOPS_H
#define _ASM_BITOPS_H
#ifndef _LINUX_BITOPS_H
#error only <linux/bitops.h> can be included directly
#endif
#ifndef __ASSEMBLER__
#include <linux/types.h>
#include <linux/compiler.h>
#ifdef CONFIG_ISA_ARCOMPACT
/*
* Count the number of zeros , starting from MSB
* Helper for fls ( ) friends
* This is a pure count , so ( 1 - 32 ) or ( 0 - 31 ) doesn ' t apply
* It could be 0 to 32 , based on num of 0 ' s in there
* clz ( 0 x8000_0000 ) = 0 , clz ( 0 xFFFF_FFFF ) = 0 , clz ( 0 ) = 32 , clz ( 1 ) = 31
*/
static inline __attribute__ ((const )) int clz(unsigned int x)
{
unsigned int res;
__asm__ __volatile__(
" norm.f %0, %1 \n"
" mov.n %0, 0 \n"
" add.p %0, %0, 1 \n"
: "=r" (res)
: "r" (x)
: "cc" );
return res;
}
static inline int constant_fls(unsigned int x)
{
int r = 32 ;
if (!x)
return 0 ;
if (!(x & 0 xffff0000u)) {
x <<= 16 ;
r -= 16 ;
}
if (!(x & 0 xff000000u)) {
x <<= 8 ;
r -= 8 ;
}
if (!(x & 0 xf0000000u)) {
x <<= 4 ;
r -= 4 ;
}
if (!(x & 0 xc0000000u)) {
x <<= 2 ;
r -= 2 ;
}
if (!(x & 0 x80000000u))
r -= 1 ;
return r;
}
/*
* fls = Find Last Set in word
* @ result : [ 1 - 32 ]
* fls ( 1 ) = 1 , fls ( 0 x80000000 ) = 32 , fls ( 0 ) = 0
*/
static inline __attribute__ ((const )) int fls(unsigned int x)
{
if (__builtin_constant_p(x))
return constant_fls(x);
return 32 - clz(x);
}
/*
* _ _ fls : Similar to fls , but zero based ( 0 - 31 )
*/
static inline __attribute__ ((const )) unsigned long __fls(unsigned long x)
{
if (!x)
return 0 ;
else
return fls(x) - 1 ;
}
/*
* ffs = Find First Set in word ( LSB to MSB )
* @ result : [ 1 - 32 ] , 0 if all 0 ' s
*/
#define ffs(x) ({ unsigned long __t = (x); fls(__t & -__t); })
/*
* _ _ ffs : Similar to ffs , but zero based ( 0 - 31 )
*/
static inline __attribute__ ((const )) unsigned long __ffs(unsigned long word)
{
if (!word)
return word;
return ffs(word) - 1 ;
}
#else /* CONFIG_ISA_ARCV2 */
/*
* fls = Find Last Set in word
* @ result : [ 1 - 32 ]
* fls ( 1 ) = 1 , fls ( 0 x80000000 ) = 32 , fls ( 0 ) = 0
*/
static inline __attribute__ ((const )) int fls(unsigned int x)
{
int n;
asm volatile (
" fls.f %0, %1 \n" /* 0:31; 0(Z) if src 0 */
" add.nz %0, %0, 1 \n" /* 0:31 -> 1:32 */
: "=r" (n) /* Early clobber not needed */
: "r" (x)
: "cc" );
return n;
}
/*
* _ _ fls : Similar to fls , but zero based ( 0 - 31 ) . Also 0 if no bit set
*/
static inline __attribute__ ((const )) unsigned long __fls(unsigned long x)
{
if (__builtin_constant_p(x))
return x ? BITS_PER_LONG - 1 - __builtin_clzl(x) : 0 ;
/* FLS insn has exactly same semantics as the API */
return __builtin_arc_fls(x);
}
/*
* ffs = Find First Set in word ( LSB to MSB )
* @ result : [ 1 - 32 ] , 0 if all 0 ' s
*/
static inline __attribute__ ((const )) int ffs(unsigned int x)
{
int n;
asm volatile (
" ffs.f %0, %1 \n" /* 0:31; 31(Z) if src 0 */
" add.nz %0, %0, 1 \n" /* 0:31 -> 1:32 */
" mov.z %0, 0 \n" /* 31(Z)-> 0 */
: "=r" (n) /* Early clobber not needed */
: "r" (x)
: "cc" );
return n;
}
/*
* _ _ ffs : Similar to ffs , but zero based ( 0 - 31 )
*/
static inline __attribute__ ((const )) unsigned long __ffs(unsigned long x)
{
unsigned long n;
asm volatile (
" ffs.f %0, %1 \n" /* 0:31; 31(Z) if src 0 */
" mov.z %0, 0 \n" /* 31(Z)-> 0 */
: "=r" (n)
: "r" (x)
: "cc" );
return n;
}
#endif /* CONFIG_ISA_ARCOMPACT */
/*
* ffz = Find First Zero in word .
* @ return : [ 0 - 31 ] , 32 if all 1 ' s
*/
#define ffz(x) __ffs(~(x))
#include <asm -generic/bitops/hweight.h>
#include <asm -generic/bitops/fls64.h>
#include <asm -generic/bitops/sched.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-setbit.h>
#endif /* !__ASSEMBLER__ */
#endif
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