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  1. Friedrich-Alexander-Universität
  2. Technische Fakultät
  3. Department Informatik
Friedrich-Alexander-Universität Lehrstuhl für Informatik 4 (Systemsoftware)
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              Dokumentation

              Namespaces | Classes | Typedefs | Enumerations | Functions | Constants
              LAPIC Namespace Reference

              Abstracts the local APIC (which is integrated into every CPU core) More...

              Namespaces

               IPI
               Inter-Processor Interrupts.
               
               Timer
               Local Timer (for each LAPIC / CPU)
               

              Classes

              struct  SpuriousInterruptVectorRegister.__unnamed58__
               

              Typedefs

              typedef uint32_t Register
               

              Enumerations

              enum  Model {
                CLUSTER = 0x0 ,
                FLAT = 0xf
              }
               
              enum  APICSoftware {
                APIC_DISABLED = 0 ,
                APIC_ENABLED = 1
              }
               APIC Software Status for Spurious Interrupt Vector.
               
              enum  FocusProcessorChecking {
                CHECKING_ENABLED = 0 ,
                CHECKING_DISABLED = 1
              }
               Focus Processor Checking for Spurious Interrupt Vector.
               
              enum  SuppressEOIBroadcast {
                BROADCAST = 0 ,
                SUPPRESS_BROADCAST = 1
              }
               Suppress End-Of-Interrupt-Broadcast for Spurious Interrupt Vector.
               
              enum  Index : uint16_t {
                IDENTIFICATION = 0x020 ,
                VERSION = 0x030 ,
                TASK_PRIORITY = 0x080 ,
                EOI = 0x0b0 ,
                LOGICAL_DESTINATION = 0x0d0 ,
                DESTINATION_FORMAT = 0x0e0 ,
                SPURIOUS_INTERRUPT_VECTOR = 0x0f0 ,
                INTERRUPT_COMMAND_REGISTER_LOW = 0x300 ,
                INTERRUPT_COMMAND_REGISTER_HIGH = 0x310 ,
                TIMER_CONTROL = 0x320 ,
                TIMER_INITIAL_COUNTER = 0x380 ,
                TIMER_CURRENT_COUNTER = 0x390 ,
                TIMER_DIVIDE_CONFIGURATION = 0x3e0
              }
               Register Offset Index. More...
               

              Functions

              Register read (Index idx)
               Get value from APIC register. More...
               
              void write (Index idx, Register value)
               Write value to APIC register. More...
               
              uint8_t getID ()
               Get the ID of the current core's LAPIC. More...
               
              uint8_t getLogicalID ()
               Get the Logical ID of the current core's LAPIC. More...
               
              uint8_t getVersion ()
               Get version number of local APIC. More...
               
              void init (uint8_t logical_id)
               Initialized the local APIC of the calling CPU core and sets the logical LAPIC ID in the LDR register. More...
               
              void endOfInterrupt ()
               Signalize EOI (End of interrupt) More...
               
              void setLogicalID (uint8_t id)
               Set the Logical ID of the current core's LAPIC. More...
               

              Constants

              volatile uintptr_t base_address = 0xfee00000
               Base Address in virtual memory used with offset to access memory mapped registers.
               

              Detailed Description

              Abstracts the local APIC (which is integrated into every CPU core)

              In modern (x86) PCs, every CPU core has its own Local APIC (LAPIC). The LAPIC is the link between the local CPU core and the I/O APIC (that takes care about external interrupt sources. Interrupt messages received by the LAPIC will be passed to the corresponding CPU core and trigger the interrupt handler on this core.

              See also
              ISDMv3 10.4 Local APIC

              Class Documentation

              struct LAPIC::SpuriousInterruptVectorRegister.__unnamed58__
              Class Members
              uint32_t spurious_vector: 8 Spurious Vector.
              APICSoftware apic_software: 1 APIC Software Enable/Disable.
              FocusProcessorChecking focus_processor_checking: 1 Focus Processor Checking.
              uint32_t reserved_1: 2
              SuppressEOIBroadcast eoi_broadcast_suppression: 1
              uint32_t reserved:19

              Enumeration Type Documentation

              enum LAPIC::Index : uint16_t

              Register Offset Index.

              See also
              ISDMv3 10.4.1 The Local APIC Block Diagram
              Enumerator
              IDENTIFICATION 

              Local APIC ID Register, RO (sometimes R/W). Do not change!

              VERSION 

              Local APIC Version Register, RO.

              TASK_PRIORITY 

              Task Priority Register, R/W.

              EOI 

              EOI Register, WO.

              LOGICAL_DESTINATION 

              Logical Destination Register, R/W.

              DESTINATION_FORMAT 

              Destination Format Register, bits 0-27 RO, bits 28-31 R/W.

              SPURIOUS_INTERRUPT_VECTOR 

              Spurious Interrupt Vector Register, bits 0-8 R/W, bits 9-1 R/W.

              INTERRUPT_COMMAND_REGISTER_LOW 

              Interrupt Command Register 1, R/W.

              INTERRUPT_COMMAND_REGISTER_HIGH 

              Interrupt Command Register 2, R/W.

              TIMER_CONTROL 

              LAPIC timer control register, R/W.

              TIMER_INITIAL_COUNTER 

              LAPIC timer initial counter register, R/W.

              TIMER_CURRENT_COUNTER 

              LAPIC timer current counter register, RO.

              TIMER_DIVIDE_CONFIGURATION 

              LAPIC timer divide configuration register, RW.

              Function Documentation

              Register LAPIC::read ( Index  idx)

              Get value from APIC register.

              Parameters
              idxRegister Offset Index
              Returns
              current value of register
              void LAPIC::write ( Index  idx,
              Register  value 
              )

              Write value to APIC register.

              Parameters
              idxRegister Offset Index
              valuevalue to be written into register
              uint8_t LAPIC::getID ( )

              Get the ID of the current core's LAPIC.

              Returns
              LAPIC ID
              uint8_t LAPIC::getLogicalID ( )

              Get the Logical ID of the current core's LAPIC.

              Returns
              Logical ID
              uint8_t LAPIC::getVersion ( )

              Get version number of local APIC.

              Returns
              version number
              void LAPIC::init ( uint8_t  logical_id)

              Initialized the local APIC of the calling CPU core and sets the logical LAPIC ID in the LDR register.

              Parameters
              logical_idAPIC ID to be set
              void LAPIC::endOfInterrupt ( )

              Signalize EOI (End of interrupt)

              Signalizes the LAPIC that the handling of the current interrupt finished. This function must be called at the end of interrupt handling before ireting.

              void LAPIC::setLogicalID ( uint8_t  id)

              Set the Logical ID of the current core's LAPIC.

              Parameters
              idnew Logical ID
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