_PageCheckLinRange

include vmm.inc

VMMcall _PageCheckLinRange, <page, nPages, flags>

mov     [Pages], eax    ; number of committed pages at start of range


#include <vmm.h>

ULONG EXTERNAL _PageCheckLinRange (ULONG page, ULONG npages, 
    ULONG flags);

Determines whether all pages in the specified range of linear addresses are committed. Uses EAX, ECX, EDX, and Flags.

• Returns the actual number of contiguous committed pages in the EAX register. In particular, the return value is zero if the first page in the specified range is not committed.

page

Page number of the first page to check. A page number is a ring-0 linear address shifted right by 12 bits.

nPages

Number of pages to check.

flags

Operation flags. Must be zero.

Virtual devices typically use this service to validate an address range before specifying the range in a call to the _LinPageLock or _LinMapIntoV86 service.

See also _LinMapIntoV86, _LinPageLock