Calculating Indexs from a virtual address

X64 Memory Paging

PML4          Directory Ptr   Page Directory   Page Table    Page Offset
x-xxxx-xxxx   x-xxxx-xxxx     x-xxxx-xxxx      x-xxxx-xxxx   XXXX-XXXX-XXXX


$address =  0xFF8000000000;

$pml4   = ($address & 0xFF8000000000) >> 39;
$pdp    = ($address & 0x7FC0000000)   >> 30;
$pd     = ($address & 0x3FE00000)     >> 21;
$pt     = ($address & 0x1FF000)       >> 12;
$offset = ($address & 0xFFF);

> 39) & 0x1FF; } function GetPageDirectoryPointer_Index( $pVirtual ) { return ($pVirtual >> 30) & 0x1FF; } function GetPageDirectory_Index( $pVirtual ) { return ($pVirtual >> 21) & 0x1FF; } function getPageDirectoryTable_Index( $pVirtual ) { return ($pVirtual >> 12) & 0x1FF; } function GetPageTableEntryForAddress( $pVirtual ) { ``` $PML4 = GetPageMapLevel4_Index( $pVirtual ); $PDP = GetPageDirectoryPointer_Index( $pVirtual ); $PD = GetPageDirectory_Index( $pVirtual ); $PT = GetpageDirectoryTable_Index( $pVirtual ); $Address = 0xFFFFFF8000000000 + (0x40000000 * $PDP) + (0x200000 * $PD) + (0x1000 * $PT); return $Address; ``` } echo "0x" . dechex( GetPageTableEntryForAddress( 0x2000 ) ) . "\n";