From: Rob Herring <rob.herr...@calxeda.com> Add __ilog2 function for ARM. Needed for ahci.c
Signed-off-by: Rob Herring <rob.herr...@calxeda.com> Cc: Albert ARIBAUD <albert.arib...@free.fr> --- Performance here is not critical, so I'm changing this to use the C version. v2 changes: - Change __inline__ to inline. - Use generic_fls function instead of clz asm so it works with ARMv4. arch/arm/include/asm/bitops.h | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/arch/arm/include/asm/bitops.h b/arch/arm/include/asm/bitops.h index 270f163..879e20e 100644 --- a/arch/arm/include/asm/bitops.h +++ b/arch/arm/include/asm/bitops.h @@ -106,6 +106,11 @@ static inline int test_bit(int nr, const void * addr) return ((unsigned char *) addr)[nr >> 3] & (1U << (nr & 7)); } +static inline int __ilog2(unsigned int x) +{ + return generic_fls(x) - 1; +} + /* * ffz = Find First Zero in word. Undefined if no zero exists, * so code should check against ~0UL first.. -- 1.7.4.1 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot