btop(9r) [osf1 man page]

btop(9r)																  btop(9r)

NAME

       btop - General: Converts bytes to number of pages

SYNOPSIS

       int btop(
	       vm_offset_t virt_addr );

ARGUMENTS

       Specifies the virtual address.

DESCRIPTION

       The btop routine converts the specified byte address to the number of pages.

RETURN VALUES

       The btop routine returns the number of kernel pages associated with the specified byte address.

																	  btop(9r)

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

       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

SunOS 5.10							    11 Apr 1991 							  btop(9F)