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Vol. 3 2-3
SYSTEM ARCHITECTURE OVERVIEW
Figure 2-1. IA-32 System-Level Registers and Data Structures
Local Descriptor
Table (LDT)
EFLAGS Register
Control Registers
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
Task-State
Segment (TSS)
Code
Data
Stack
Task
Interrupt Handler
Exception Handler
Protected Procedure
TSS Seg. Sel.
Call-Gate
Segment Selector
Dir
Table Offset
Linear Address
Page Directory
Pg. Dir. Entry
Linear Address Space
Linear Addr.
0
Seg. Desc.
Segment Sel.
Code, Data or
Stack Segment
Interrupt
Vector
TSS Desc.
Seg. Desc.
Task Gate
Current
TSS
Call Gate
Tas k-State
Segment (TSS)
Code
Data
Stack
Tas k
Seg. Desc.
Current
TSS
Current
TSS
Segment Selector
Linear Address
Task Register
CR3*
Page Table
Pg. Tbl. Entry
Page
Physical Addr.
LDTR
This page mapping example is for 4-KByte pages
and the normal 32-bit physical address size.
Register
*Physical Address
Physical Address
XCR0 (XFEM)