1.4.5 Buffer and MDL Management

ADDRESS_AND_SIZE_TO_SPAN_PAGES

Returns the number of pages required to contain a given virtual address and size in bytes.

BYTE_OFFSET 

Returns the byte offset of a given virtual address within the page.

BYTES_TO_PAGES 

Returns the number of pages necessary to contain a given number of bytes.

PAGE_ALIGN 

Returns the page-aligned virtual address for the page that contains a given virtual address.

ROUND_TO_PAGES 

Rounds a give size in bytes up to a page-size multiple.