HP 8000 manual System Resources, Interrupts, Apic Mode

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System Support

4.3 System Resources

This section describes the availability and basic control of major subsystems, otherwise known as resource allocation or simply “system resources.” System resources are provided on a priority basis through hardware interrupts and DMA requests and grants.

4.3.1 Interrupts

The microprocessor uses two types of hardware interrupts; maskable and nonmaskable. A maskable interrupt can be enabled or disabled within the microprocessor by the use of the STI and CLI instructions. A nonmaskable interrupt cannot be masked off within the microprocessor, but may be inhibited by legacy hardware or software means external to the microprocessor.

The maskable interrupt is a hardware-generated signal used by peripheral functions within the system to get the attention of the microprocessor. Peripheral functions produce a unique INTA-H (PCI) or IRQ0-15 (ISA) signal that is routed to interrupt processing logic that asserts the interrupt (INTR-) input to the microprocessor. The microprocessor halts execution to determine the source of the interrupt and then services the peripheral as appropriate.

Most IRQs are routed through the I/O controller of the super I/O component, which provides the serializing function. A serialized interrupt stream is then routed to the ICH component.

Interrupts may be processed in one of two modes (selectable through the F10 Setup utility):

8259 mode

APIC mode

These modes are described in the following subsections.

8259 Mode

The 8259 mode handles interrupts IRQ0-IRQ15 in the legacy (AT-system) method using

8259-equivalent logic. If more than one interrupt is pending, the highest priority (lowest number) is processed first.

APIC Mode

The Advanced Programmable Interrupt Controller (APIC) mode provides enhanced interrupt processing with the following advantages:

Eliminates the processor's interrupt acknowledge cycle by using a separate (APIC) bus

Programmable interrupt priority

Additional interrupts (total of 24)

The APIC mode accommodates eight PCI interrupt signals (PIRQA-..PIRQH-) for use by PCI devices. The PCI interrupts are evenly distributed to minimize latency and wired as shown in Table 4-5.

 

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Contents December Technical Reference GuideTechnical Reference Guide Contents Input/Output Interfaces Processor/Memory SubsystemSystem Support Integrated Graphics Subsystem Power and Signal DistributionError Messages and Codes Index System BiosAbout this Guide IntroductionAdditional Information Sources Online ViewingNotational Conventions Serial NumberSpecial Notices ValuesAcronym or Abbreviation Description Common Acronyms and AbbreviationsAcronyms and Abbreviations CGA CDSCMC CmosEPP EisaEide EscdIRQ IPLISA LANODD NvramPAL PataSdvo SdramSEC SecamUdma UartUdimm URLIntroduction Introduction System OverviewFeatures 1ODD Feature Differences by Form FactorFunction System ArchitectureArchitectural Differences by Form Factor HP Compaq 8000 Elite Business PC Architecture, Block diagram Chipset Intel Processor SupportChipset Components and Functionality Components FunctionSystem Memory Support ComponentsSupport Component Functions Component Name FunctionSerial Interface Mass StorageUniversal Serial Bus Interface Network Interface ControllerAudio Subsystem Graphics SubsystemIntegrated Graphics Subsystem Statistics Integrated Graphics ControllerEnvironmental Specifications Factory Configuration SpecificationsHP ProtectTools Embedded Security Parameter Operating Non-operatingPhysical Specifications Power Supply Electrical SpecificationsParameter Value Parameter Usdt SFF CMTSystem Overview Processor/Memory Subsystem Architecture Processor/Memory SubsystemIntel Processor Overview Intel ProcessorsSupported Processors partial listing Processor Changing/UpgradingHighest Clock FormMemory Subsystem Memory Mapping and Pre-allocation Memory UpgradingMemory Socket Loading Channel a Channel B Socket Socket 2 Socket 4 TotalSystem Memory Map for maximum of 8 gigabytes PCI 2.3 Bus Operation System SupportPCI Bus Overview PCI Component Function # Device # Wired to PCI Component Configuration Access PCI BusSoftware/Driver Layer PCI Express Bus OperationTransaction Protocol Layer PCI Bus Mastering DevicesOption ROM Mapping PCI Power Management SupportPCI Interrupts Link LayerPCI 2.3 Bus Connector Pinout PCI ConnectorsPCI 2.3 Connector PCIe Bus Connector Pinout PCIe ConnectorsSystem Resources Apic ModeInterrupts ModePCI Interrupt Distribution Direct Memory AccessClearing Cmos Real-Time Clock and Configuration MemorySystem Management Configuration Memory Cmos MapStandard Cmos Locations Security FunctionsSetup Password Power-On / Setup PasswordCable Lock Provision Interface SecuritySmart Cover Lock Optional Power ManagementAcpi Wake-Up Events Acpi Wake-Up Event System Wakes FromSystem Status System Status PowerLED Beeps Action RequiredThermal Sensing and Cooling System Operational Status LED IndicationsSystem I/O Map Register Map and Miscellaneous FunctionsPort Function System I/O MapSIO Controller Functions Gpio FunctionsICH10 Functions Input/Output Interfaces SATA/eSATA Interfaces Pin Sata Connector PinoutSata interface Pin DescriptionESATA interface Optional eSATA Bracket/Cable AssemblySerial Interface DB-9 Serial Connector PinoutPin Signal Description Enhanced Parallel Port Mode Standard Parallel Port ModeExtended Capabilities Port Mode Parallel Interface SupportPin Signal Function Parallel Interface ConnectorDB-25 Parallel Connector Pinout Keyboard Interface Operation Keyboard/Pointing Device InterfaceKeyboard/Pointing Device Connector Pinout Keyboard/Pointing Device Interface ConnectorPointing Device Interface Operation DataController Signals USB Connector Location all form factors USB ConnectorUniversal Serial Bus Interface ICH10 USB Port MappingUSB Cable Data USB Connector PinoutUSB Cable Length Data USB Color CodeAudio Subsystem Audio Subsystem Functional Block DiagramAudio Multistreaming HD Audio ControllerHD Audio Link Bus HD Audio Subsystem Specifications Audio SpecificationsParameter Measurement ADC/DACFunction Activity LED Speed LED Network Interface Controller10. LAN LED Indications Alert Standard Format Support Power Management SupportWake-On-LAN Support NIC Specifications NIC Connector11. NIC Specifications Parameter Compatibility standard orprotocolIntegrated Graphics Subsystem RGB Functional DescriptionGMA 4500 Memory Allocation Sdram Installed Maximum Memory AllocationIGC Standard 2D Display Modes Resolution Maximum Refresh Rate Analog Digital MonitorDisplay Modes Upgrading DB-15 Monitor Connector Pinout Monitor ConnectorsAnalog Monitor Connector Pin Signal DisplayPort ConnectorIntegrated Graphics Subsystem Usdt Power Distribution Power and Signal DistributionParameter SFF/CMT Power DistributionUsdt 135-Watt Power Supply Unit Specifications CMT 320-Watt Power Supply Unit Specifications SFF 240-Watt Power Supply Unit SpecificationsPower Button Power ControlPower Button Actions Pressed Power Button ResultsPower LED Indications Condition Wake Up Events Power ManagementPower Transition OS Restart System Power StatesState System Condition Consumption To S0 by RequiredCR1 +5 VDC LED Signal DistributionSystem Board Connector, Indicator, and Switch Designations Power and Signal Distribution System Bios Changeable Splash Screen ROM FlashingUpgrading Boot Device Order Boot FunctionsNetwork Boot F12 Support Memory Detection and ConfigurationVisual power LED Audible speaker Meaning Boot Error CodesBoot Error Codes Client Management Functions INT15 Function ModeClient Management Functions System ID and ROM Type Temperature StatusSystem ID Numbers System Form Factor System IDType Data Smbios FunctionsManagement Engine Functions USB Legacy SupportBeep/Power LED Codes Error Messages and CodesTable A-1 Beep/Power LED Codes Beeps Power LED Probable CausePower-On Self Test Post Messages Table A-2 Table A-2 Error Message Probable CauseTable A-3 System Error Messages Probable Cause System Error MessagesMemory Error Messages Memory Error MessagesTable A-4 Message Probable CauseTable A-5 Keyboard Error Messages Probable Cause Keyboard Error MessagesVideo Graphics Error Messages Printer Error MessagesTable A-6 Printer Error Messages Probable Cause Table A-7 Video Graphics Error Messages Probable CauseTable A-8 Diskette Drive Error Messages Probable Cause Diskette Drive Error MessagesTable A-9 Serial Interface Error Messages Probable Cause Serial Interface Error MessagesModem Communications Error Messages Table A-11 System Status Error MessagesSystem Status Error Messages Table A-12 Hard Drive Error Messages Probable Cause Hard Drive Error MessagesXx = 03, Hard drive read/write compare test Table A-13 Hard Drive Error Messages Probable Cause Table A-15 Audio Error Messages Probable Cause Audio Error MessagesTable A-14 Video Graphics Error Messages Probable Cause Network Interface Error Messages 17 DVD/CD-ROM Error MessagesDVD/CD-ROM Error Messages Table A-17 Network Interface Error Messages Probable CauseTable A-18 Scsi Interface Error Messages Scsi Interface Error Messages 65xx-xx, 66xx-xxPointing Device Interface Error Messages 8601-xx Error Messages and Codes Numerics IndexIndex
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