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)