Addressing Mechanism, Protected Mode Addressing | Intel 80386

80386

4.2 ADDRESSING MECHANISM

Like Real Mode, Protected Mode uses two compo- nents to form the logical address, a 16-bit selector is used to determine the linear base address of a seg- ment, the base address is added to a 32-bit effective address to form a 32-bit linear address. The linear address is then either used as the 32-bit physical address, or if paging is enabled the paging mecha- nism maps the 32-bit linear address into a 32-bit physical address.

The difference between the two modes lies in calcu- lating the base address. In Protected Mode the se- lector is used to specify an index into an operating

system defined table (see Figure 4-1). The table contains the 32-bit base address of a given seg- ment. The physical address is formed by adding the base address obtained from the table to the offset.

Paging provides an additional memory management mechanism which operates only in Protected Mode. Paging provides a means of managing the very large segments of the 80386. As such, paging operates beneath segmentation. The paging mechanism translates the protected linear address which comes from the segmentation unit into a physical address. Figure 4-2 shows the complete 80386 addressing mechanism with paging enabled.

48/32 BIT POINTER

							SEGMENT LIMIT
				~ MEMORY OPERAND			r
							UP TO	SELECTED
			ACCESS RIGHTS				4GB	SEGMENT
			ACCESS RIGHTS				1
			LIMIT				1
			LIMIT
			BASE ADDRESS		SEGMENT BASE
					SEGMENT BASE
			SEGMENT		ADDRESS
			DESCRIPTOR						231630-55
									231630-55
				Figure 4-1. Protected Mode Addressing
,	48 BIT POINTER		,				PHYSICAL ADDRESS		!4K BYTES
I SEGMENT I OFFSET									!4K BYTES
15	31	I	0						!
15	31	I	0						4K BYTES
					80386				!4K BYTES
	ACCESS RIGHTS			,.	PAGING	PHYSICAL
	ACCESS RIGHTS				MECHANISM	PHYSICAL
		LIMIT				ADDRESS	MEMORY OPERAND !PHYSICAL4K BYTES			PAGE:
	~ BASE ADDRESS ~ LlNEAR~					PAGE FRAME	MEMORY OPERAND !PHYSICAL4K BYTES			PAGE:
	SEGMENT			ADDRESS		ADDRESS			!4K BYTES
	DESCRIPTOR								!4K BYTES
									!4K BYTES

!4K BYTES

231630-56

Figure 4-2. Paging and Segmentation

34

Image 95

Intel 80386 manual Addressing Mechanism, Protected Mode Addressing

Contents

Page Inter Intel Corporation Table of Contents Chapter Architectural Compatibility Chapter Highlights Page High-performance Implementation 32-bit Architecture Highlights Extended Debugging Support Configurable ProtectionVirtual Memory Support Summary Object Code Compatibility Application Architecture Page Flags and Instruction Pointer RegistersGeneral Registers Numeric Coprocessor Registers Memory and logical Addressing Logical Address Translation Segment and Descriptor Registers Addressing Modes Principal Data Types Data Types and Instructions Stack Instructions Numeric Coprocessor Data TypesOther Instructions ~.,...I-------.-1 Byte String LII Miscellaneous Instructions Chapter System Architecture Page Multitasking System Registers Task State Segment Task Switching Address Translation Overview Addressing Address Translation Overview Segments Principal Descriptor Fields ~~~~~.II~~~ Pages Linear to Physical Address Translation Virtual Memory I I I Privilege Protection USing Privilege Levels Segment Protection Privileged Instructions Protection 10. Gates as Protected Entry Points Interrupts and Exceptions Interrupt Descriptor Table Debug Eceptions and Registers System Architecture Page Architectural Compatibility Page Real and Virtual 86 Modes 80286 Compatibility Architectural Compatibility Trapping Virtual 861\11ode System Calls Page Chapter Hardware Implementation Page Chapter Hardware Implementation Hardware Implementation Data and Address Buses Clock Bus Cycle Control Bus Cycle Definition Non-pipelined Bus Cycle Timing Bus Cycles with Pipelined Addresses Coprocessor Control Dynamic Bus SizingProcessor Status and Control Mixed 16- and 32-bit Accesses Chapter Data Sheet Page 80386 Update Notice Table of Contents Privilege Validation Descriptor Tables IntroductionInterrupt Descriptor Table Segment Descriptor Cache Functional Data Pipelined Address with Dynamic Data Bus Sizing Package Thermal Specification3.4 Initiating and Maintaining Pipelined Address Register Overview Base Architecture Introduction Flags Register Register DescriptionsGeneral Purpose Registers Instruction Pointer TSS Other Segment Physical Base Address Segment Limit Segment RegistersSegment Registers Descriptor Registers Loaded Automatically MSW Segment Descriptor RegistersControl Registers Flects the current state of the ET bit Directory Base Register CR3 TS Task Switched, bitFault Linear Address Register CR2 System Address Registers Compatibility Register AccessibilityDebug and Test Registers Idtr Instruction Set OverviewIopl Gdtr 2b Arithmetic Instructions 2 80386 Instructions2dLogical Instructions 2a Data Transfer 2h Protection Model 2e Bit Manipulation Instructions2f. Program Control Instructions 2g High Level Language Instructions 3 32-Bit Memory Addressing Modes Addressing Modes OverviewRegister and Immediate Modes Differences Between 16 and 32 Bit Addresses Addressing Mode Calculations None DisplacementData Types Base Register BX,BP Index Register SI,DI Scale Factor Sign ED rrrrrrrrl LilliililillIl Address Spaces Memory OrganizationIntroduction Segment Register Usage I/O Space Maskable Interrupt InterruptsInterrupts and Ecep~ions Interrupt Processing Software Interrupts Non-Maskable Interrupt NMI 2.INTR Interrupt and Exception Priorities Instruction Restart Reset and InitializationDouble Fault Debugging Support TLB TestingTestability Self-Test Debug Registers Breakpoint InstructionSingle-Step Trap DR4 DR1DR2 DR3 Usage Encoding Causing Breakpoint Debug Status Register DR6 Real Mode Architecture Real Mode Introduction ADD, OR, ADC, SBB SET/RESET/COMPLEMENTMemory Addressing Xchg Shutdown and Halt Reserved LocationsIntierrupts Addressing Mechanism Protected Mode Addressing Descriptor Tables Introduction Segmentation IntroductionTerminology Descriptor Tables Segment Base 15 Segment Limit 15 DescriptorsByte Address Dptm typ , data gm,nt System Descriptor Formats Offset 31 SelectorOffset 15 Word Segment Descriptor Cache Differences Between 386 and 286 DescriptorsSegment Base 15 Selector Fields Nil R~L ~~~~~~~EL~~E~ ~A~~ ~I~I! ttl ~!~~~~E L~~E~~~s~ I~I! ~ J ~~?~~~~EL~~E~B~~E ~I~I~ tJ1 Privilege Levels Protection ConceptsRules of Privilege Privilege Level Transfers CALL, JMP GOT/LOTCall RET,IRET 80386 Call Ga~es Task Switching Infef Initialization and Transition to Protected Mode Paging Concepts Tools for Building ProtectedPaging Systems Directory Paging OrganizationMechanism Descriptor Base Register DIRECTORY/TABLE Entries Level Protection R/W, U/S BitsFrame Address 31 Reserved Tables Paging Operation Translation Lookaside Buffer Executing 8086 Programs Paging In Virtual ModeAccess Type Virtual 8086 Environment 24. Virtual 8086 Environment Memory Management Protection and 1/0 Permission Bitmap Entering and Leaving Virtual Interrupt Handling Task Switches TO/FROM Virtual 8086 Mode For state saving i.e. push all registers in prolog, pop ·25.Virtual 8086 Environment Interrupt and Call Handling Clock CLK2 Introduction Address Bus BEO# through BE3#, A2 through A31 Data Bus do through Bus Cycle Definition Signals W/R#, D/C#, MIIO#, LOCK# Introduction Bus Control Signals Coprocessor Interface Signals Bus Arbitration Signals Interrupt Signals Signal Summary BEO# Memory and 1/0 Spaces Dynamic Data Bus Sizing Memory and 110 Organization Cycles 1 and 1a Interfacing with 32- and 16-Bit Memories BEO# BHE# BLE# AD Operand Alignment Li,\~~ P1 1.p2 .p1 1.p2 .p1 1.p2 .p1 1.p2 .p1 1.p2 .p1 1.p2 .p1 ·9.Fastest Read Cycles with Pipelined Address Timing Address Pipelining FOUR-BANK Interleaved Memory Address signal A2 selects bank Bit datapath to each bankTWO-BANK Interleaved Memory Introduction Read and Write Cycles Ixxx NON-PIPELINED AddressXxxxx Ixxxx Xxxi Xxxix 13 80386 Bus States not usIng pipelined address ·14Asserting BS16# zero wait states, non·pipelinedaddress 3.3 NON·PIPELINED Address with Dynamic Data BUS Sizing BSI6# XXX XXx XXX X .. IXXXXwOO~ J, XXX XXX1/ \ Xixxxxx ValidXixxxx ,XXXXY ~~~~ DOO¥ B516# ~~..tJ.~~~~~~~ Bus Sizing with Pipelined Address BS16 # 44~~~...l-.lI...l Ready # 44~~.lI...l/l Acknowledge ~ ,T1-T~-T2PJ ,T1PT2PJ Idle non-pipelined pipelinedPipelined IO#, D/c# 20 Complete Bus States including pipelined address Ffi ~ -XXIXXY Xxxxy ~j XDONTCAR~X~ x~ ~X~~lKX~ /..XXXXXxxxx IXXXXIXXXXI.. /..DXXXIXXX ~ Xxxxiy Xxixxy ~ /..XIXXY ~--cp--- ----- ----- ----- ----- ~ Interrupt Acknowledge Inta Cycles 23.Halt Indication Cycle Halt Indication Cycle 24. Shutdown Indication Cycle Shutdown Indication Cycle Entering and Exiting Hold Acknowledge Reset During Hold AcknowledgeBus Activity During and Following Reset Other Functional Descriptions 26. Requesting Hold from Active Bus NA # negated Component and Revision Identifiers SELF-TEST Signature Component Revision Stepping Identifier Name Component Revision CMD1 Software Testing for Coprocessor Presence PIN Assignment Mechanical Data Introduction 000 0 0 0 000 0 0 Vee Vss 1654189~1 Package Dimensions and Mounting Measure PGA Case Temperature Package Thermal Specification Ill Infef80386 Electrical Data Power and Grounding Maximum Ratings D.C. Specifications 102 A.C. Specifications1 A.C. Spec Definitions Unit Min Max Operating Frequency MHz Half of CLK2 2 A.C. Specification Tables·4 -16 A.C. Characteristics Symbol Parameter 80386-16 80386-16 Min Unit Max 16 A.C. Characteristics Symbol ParameterSymbol Parameter Min 80386 ~QW~OOg OOOIP@OOIMl~iiO@OO 3 A.C. Test Loads 4 A.C. Timing Waveforms 106 MAX Itm PI~ 80386 Instruction Encoding Instruction SET 111 8o386Instructlon Set CIock Count Summary 112 ·1 Instruction Set Clock Count Summary RIm 80386 Instructlon Set CIockCount S ummary Contlnued Doubleword ·1 80386 Instruction Set Clock Count Summary 115 Instruction Set Clock Count Summary BIT Manipulation Instruction Set Clock Count Summarycontlnued +ml 7+ml Instruction Set Clock Count Summar Protected 80386 Ins ruefIon SetCIoek CountSummary ConrInued 119 120 Interrupt Instructions 80386 Instructlon Set CIockCountSummaay Contmued Bound O3861nstructlon Set CIockCount Summary Contlnued 80386 nstructlon Set CIockCount Summary Contlnued Infef80386 Madear Ns ruetIon StCIe oekCount 5 ummary Contlnued ~~~\ Overview Bits 2 32-Bit Extensions of the Instruction SetEncoding of Instruction Fields Field Encoding of Address Mode EOI OsbxOSBX+d16 11010 OS EAX Scale Factor NE/NZ Encoding of Operation DirectionNAE NB/AE California Domestic Sales Offices United States