btopr(9f) [linux man page]

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)

btop(9F)						   Kernel Functions for Drivers 						  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

       The  btop()  function 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

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

SEE ALSO

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

       Writing Device Drivers

SunOS 5.11							    16 Jan 2006 							  btop(9F)