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


NAME


btopr - convert size in bytes to size in pages (round up)

SYNOPSIS


#include <sys/ddi.h>


unsigned long btopr(unsigned long numbytes);


INTERFACE LEVEL


Architecture independent level 1 (DDI/DKI).

PARAMETERS


numbytes
Number of bytes.


DESCRIPTION


The btopr() function returns the number of memory pages contained in the
specified number of bytes memory, rounded up to the next whole page. For
example, if the page size is 2048, then btopr(4096) returns 2, and
btopr(4097) returns 3.

RETURN VALUES


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

CONTEXT


The btopr() function can be called from user, interrupt, or kernel
context.

SEE ALSO


btop(9F), ddi_btopr(9F), ptob(9F)


Writing Device Drivers


January 16, 2006 BTOPR(9F)