Changes between Version 35 and Version 36 of io_operations


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Timestamp:
Nov 22, 2017, 6:19:14 PM (4 years ago)
Author:
alain
Comment:

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  • io_operations

    v35 v36  
    149149
    150150The LAPIC controller (called XCU) is replicated in all clusters containing at least one core. It handle three types of event:
    151  1. A '''HWI''' (HardWare Interrupt) is generated by local internal peripherals. This type implements the internal interrupts.(INT_IRQs).
    152  1. A '''PTI''' (Programmable Timer Interrupt) is generated by a software programmable timer implemented in the XCU controller. This type is used to implement the timer interrupts required for context switch.
    153  1. A '''WTI''' (Write Triggered Interrupts) is actually a mailbox implemented in the local XCU. They are used to implement both inter-processor interrupts, or to register the external interrupts generated by the IOPIC controller. The first WTI mailboxes are used for IPI_IRQ (one IPI per local core). The other WTI mailboxes are used for EXT_IRQs.
     151 1. A '''HWI''' (Hardware Interrupt) is generated by local internal peripherals. This type implements directly the internal interrupts.
     152 1. A '''PTI''' (Programmable Timer Interrupt) is generated by a software programmable timer implemented in the XCU controller. This type implements directly the timer interrupts required for context switch.
     153 1. A '''WTI''' (Write Triggered Interrupts) is actually a mailbox implemented in the local XCU. They are used to implement both inter-processor interrupts, or to register the external interrupts generated by the IOPIC controller. The first WTI mailboxes are used for IPI (one IPI per local core). The other WTI mailboxes are used for external interrupts.IRQs.
    154154
    155155The actual numbers of events of each type supported by a given XCU component are defined in the XCU_CONFIG register of the XCU component, and cannot be larger than the SOCLIB_MAX_HWI, SOCLIB_MAX_WTI, SOCLIB_MAX_PTI constants defined in the '' soclib_pic.h'' file.