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2-4 Vol. 3
SYSTEM ARCHITECTURE OVERVIEW
Figure 2-2. System-Level Registers and Data Structures in IA-32e Mode
Local Descriptor
Table (LDT)
CR1
CR2
CR3
CR4
CR0
Global Descriptor
Table (GDT)
Interrupt Descriptor
Table (IDT)
IDTR
GDTR
Interrupt Gate
Trap Gate
LDT Desc.
TSS Desc.
Code
Stack
Code
Stack
Code
Stack
Current TSS
Code
Stack
Interr. Handler
Interrupt Handler
Exception Handler
Protected Procedure
TR
Call-Gate
Segment Selector
Linear Address
PML4
PML4.
Linear Address Space
Linear Addr.
0
Seg. Desc.
Segment Sel.
Code, Data or Stack
Segment (Base =0)
Interrupt
Vector
Seg. Desc.
Seg. Desc.
NULL
Call Gate
Tas k-State
Segment (TSS)
Seg. Desc.
NULL
NULL
Segment Selector
Linear Address
Task Register
CR3*
Page
LDTR
This page mapping example is for 4-KByte pages
and 40-bit physical address size.
Register
*Physical Address
Physical Address
CR8
Control Register
RFLAGS
Offset
Tab leDirectory
Page Table
Entry
Physical
Addr.Page Tbl
Entry
Page Dir.
Pg. Dir. Ptr.
PML4
Dir. Pointer
Pg. Dir.
Entry
Interrupt Gate
IST
XCR0 (XFEM)