Проект OpenNet: MAN MAP_NR () (FreeBSD и Linux)

Интерактивная система просмотра системных руководств (man-ов)

MAP_NR ()

>> MAP_NR (9) ( Разные man: Ядро )

NAME

MAP_NR - get memory map index for page in kernel memory

SYNOPSIS

#include <linux/mm.h>

#define MAP_NR(page)

DESCRIPTION

This macro maps the page of kernel memory to an index into the mem_map array. The input page is kernel-space page addresses such as those that come from the get_free_page(9) function. The expression mem_map[MAP_NR(page)] returns a pointer to a mem_map_t for the page in question.

Device drivers need access to the page structure if it is implimenting some special kind of memory segment, i.e. cache for a virtual frame buffer.