diff options
| author | Fabio Estevam <fabio.estevam@freescale.com> | 2015-11-05 12:43:25 -0200 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2015-11-05 10:52:01 -0500 |
| commit | 6c2f758cee266f764828b05fb7811ee3d4a7adec (patch) | |
| tree | 079273084d10c568cf1adc8f13604fac924e59fc /arch/x86 | |
| parent | 56adb7b30862f1abc2111132376fdb93da6a7563 (diff) | |
x86: Use the generic bitops headers
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>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/bitops.h | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/arch/x86/include/asm/bitops.h b/arch/x86/include/asm/bitops.h index 5a7e4cba2b..f97dc66439 100644 --- a/arch/x86/include/asm/bitops.h +++ b/arch/x86/include/asm/bitops.h @@ -14,6 +14,10 @@ * 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 #define LOCK_PREFIX "lock ; " #else @@ -332,6 +336,20 @@ static __inline__ unsigned long ffz(unsigned long word) #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 * @x: the word to search * @@ -346,7 +364,8 @@ static __inline__ int ffs(int x) __asm__("bsfl %1,%0\n\t" "jnz 1f\n\t" "movl $-1,%0\n" - "1:" : "=r" (r) : "g" (x)); + "1:" : "=r" (r) : "rm" (x)); + return r+1; } #define PLATFORM_FFS |