btop(9F)

NAME

     btop - convert size in bytes to size in pages (round down)

SYNOPSIS

     #include <sys/ddi.h>

     unsigned long btop(unsigned long numbytes);

INTERFACE LEVEL

     Architecture independent level 1 (DDI/DKI).

PARAMETERS

     numbytes
           Number of bytes.

DESCRIPTION

     btop() returns the number of memory pages that are contained
     in  the specified number of bytes, with downward rounding in
     the case that the byte count is not a  page  multiple.   For
     example, if the page size is  2048, then  btop(4096) returns
     2, and  btop(4097) returns  2 as well. btop(0) returns  0.

RETURN VALUES

     The return value is always the number of pages. There are no
     invalid input values, and therefore no error return values.

CONTEXT

     btop() can be called from user or interrupt context.

SEE ALSO

     btopr(9F), ddi_btop(9F), ptob(9F)

     Writing Device Drivers