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4-26 Vol. 3
PAGING
Because a PDE is identified using bits 47:21 of the linear address, it controls access
to a 2-MByte region of the linear-address space. Use of the PDE depends on its PS
flag (bit 7):
Figure 4-9. Linear-Address Translation to a 2-MByte Page using IA-32e Paging
Directory Ptr
Linear Address
PDPTE
CR3
39 38
Pointer Table
9
9
40
21
31
2-MByte Page
Offset
Physical Addr
PDE with PS=1
02021
Directory
30 29
Page-Directory-
Page-Directory
PML4
47
9
PML4E
40
40