ddi_fls man page on Solaris

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ddi_ffs(9F)		 Kernel Functions for Drivers		   ddi_ffs(9F)

NAME
       ddi_ffs, ddi_fls - find first (last) bit set in a long integer

SYNOPSIS
       #include <sys/conf.h>
       #include <sys/ddi.h>
       #include <sys/sunddi.h>

       intddi_ffs(long mask);

       int ddi_fls(long mask);

INTERFACE LEVEL
       Solaris DDI specific (Solaris DDI).

PARAMETERS
       mask	       A 32-bit argument value to search through.

DESCRIPTION
       The  function  ddi_ffs() takes its argument and returns the shift count
       that the first (least significant) bit set in the argument  corresponds
       to.  The	 function  ddi_fls()  does the same, only it returns the shift
       count for the last (most significant) bit set in the argument.

RETURN VALUES
       0	No bits are set in mask.

       N	Bit  N is the least significant (ddi_ffs) or most  significant
		(ddi_fls)  bit	set in mask. Bits are numbered from  1 to  32,
		with bit 1 being the least significant bit position and bit 32
		the most significant position.

CONTEXT
       This function can be called from user, interrupt, or kernel context.

SEE ALSO
       Writing Device Drivers

SunOS 5.10			  16 Jan 2006			   ddi_ffs(9F)
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