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x86: Use the generic bitops headers

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Use the generic bitops and also add custom __ffs() implementation
as per the kernel.

Also align the ffs() implementation with the kernel.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Jagan Teki <jteki@openedev.com>
This commit is contained in:
Fabio Estevam 2015-11-05 12:43:25 -02:00 • committed by Tom Rini
parent 56adb7b308
commit 6c2f758cee
1 changed files with 20 additions and 1 deletions
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21
arch/x86/include/asm/bitops.h
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@ -14,6 +14,10 @@
* bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1). * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
*/ */
#include <asm-generic/bitops/fls.h>
#include <asm-generic/bitops/__fls.h>
#include <asm-generic/bitops/fls64.h>
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
#define LOCK_PREFIX "lock ; " #define LOCK_PREFIX "lock ; "
#else #else
@ -331,6 +335,20 @@ static __inline__ unsigned long ffz(unsigned long word)
#ifdef __KERNEL__ #ifdef __KERNEL__
/**
* __ffs - find first set bit in word
* @word: The word to search
*
* Undefined if no bit exists, so code should check against 0 first.
*/
static inline unsigned long __ffs(unsigned long word)
{
__asm__("rep; bsf %1,%0"
: "=r" (word)
: "rm" (word));
return word;
}
/** /**
* ffs - find first bit set * ffs - find first bit set
* @x: the word to search * @x: the word to search
@ -346,7 +364,8 @@ static __inline__ int ffs(int x)
__asm__("bsfl %1,%0\n\t" __asm__("bsfl %1,%0\n\t"
"jnz 1f\n\t" "jnz 1f\n\t"
"movl $-1,%0\n" "movl $-1,%0\n"
"1:" : "=r" (r) : "g" (x)); "1:" : "=r" (r) : "rm" (x));
return r+1; return r+1;
} }
#define PLATFORM_FFS #define PLATFORM_FFS