/**
 * PROJECT:         ExectOS
 * COPYRIGHT:       See COPYING.md in the top level directory
 * FILE:            xtoskrnl/mm/i686/pages.c
 * DESCRIPTION:     Architecture dependent paging support
 * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
 */

#include <xtos.h>


/**
 * Fills a section of memory with zeroes like RtlZeroMemory(), but in more efficient way.
 *
 * @param Address
 *        Supplies an address of the page to be filled with zeroes.
 *
 * @param Size
 *        Number of bytes to be filled with zeros. This always should be a multiply of page size.
 *
 * @return This routine does not return any value.
 *
 * @since XT 1.0
 */
XTFASTCALL
VOID
MmZeroPages(IN PVOID Address,
            IN ULONG Size)
{
    asm volatile("xor %%eax, %%eax\n"
                 "rep stosb"
                 : "=D"(Address),
                   "=c"(Size)
                 : "0"(Address),
                   "1"(Size),
                   "a"(0)
                 : "memory");
}