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| author | Stefano Babic <sbabic@denx.de> | 2015-11-12 17:13:26 +0100 |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2015-11-12 17:13:26 +0100 |
| commit | 5f5620ab2679608f94b3a77e51c77d0a770103bd (patch) | |
| tree | ec983c06d2f62384909968bb870add121b8a1502 /arch/x86/include/asm/bitops.h | |
| parent | 78e9ca52edaab74ad645d719676ff4c24d2f462c (diff) | |
| parent | 038be18fd95aa6283eafb85ceabc0b880976424b (diff) | |
Merge git://git.denx.de/u-boot
Diffstat (limited to 'arch/x86/include/asm/bitops.h')
| -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 |