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
btopr() returns the number of memory pages contained in the specified number of bytes memory, rounded up to the next whole page. For exam-
ple, 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
btopr() can be called from user or interrupt context.
SEE ALSO
btop(9F), ddi_btopr(9F), ptob(9F)
Writing Device Drivers
SunOS 5.10 11 Apr 1991 btopr(9F)
