Changes between Version 19 and Version 20 of kernel_interrupts


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Timestamp:
Mar 27, 2015, 10:28:40 AM (10 years ago)
Author:
alain
Comment:

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  • kernel_interrupts

    v19 v20  
    5454
    5555 === void '''_isr_wakup'''( unsigned int irq_type,  unsigned int irq_id,  unsigned int channel ) ===
    56 This ISR can only be executed after a WTI (IPI) awake an idle processor, or to force a context switch
    57 on a remote processor. The context switch is only executed if the current task is the IDLE_TASK, or if the value written in the mailbox is non zero.
     56This ISR is executed after a WTI WAKUP (Inter Processor Interrupt). It is used to awake a processor in ''wait'' mode (low-power mode), or to force a context switch on a remote processor. The context switch is only executed if the current task is the IDLE_TASK, or if the value written in the mailbox is non zero.
    5857
    5958 === void '''_isr_tick'''( unsigned int irq_type,  unsigned int irq_id,  unsigned int channel ) ===
    60 This ISR is in charge of context switch, and handles the IRQs generated by
    61 // the "system" timers. It can be PTI in case of XCU, or it can be HWI generated
    62 // by an external timer in case of ICU.
    63 // The ISR acknowledges the IRQ, and calls the _ctx_switch() function.
     59This ISR is in charge of context switch, and handles the PTI IRQs generated by the XCU timers.
     60The ISR acknowledges the IRQ, and calls the _ctx_switch() function.
    6461
    6562 === void '''_isr_default'''() ===
     
    6966
    7067 === void '''_ext_irq_init'''() ===
    71 This function is only used when the architecture contains an external IOPIC component. It initializes the _ext_irq_index[isr][channel] array,
    72 defining the IRQ index associated to an (isr_type/isr_channel) couple, as specified in the mapping.
    73 This array is used by the kernel for dynamic routing of external IRQs.
     68This function is only used when the architecture contains an external IOPIC component. It initializes the ''_ext_irq_index[isr][channel]'' kernel array. This array defines the IRQ index (i.e. the IOPIC input index) associated to an (isr_type / isr_channel) couple, as specified in the mapping. It is used by the kernel for dynamic routing of external IRQs.
    7469
    7570 === void '''_ext_irq_alloc( unsigned int isr_type , unsigned int isr_channel , unsigned int* wti_index ) ===
    76 This function is used when the architecture contains an external IOPIC component. It dynamically allocates an external IRQ signaling completion of an I/O operation to the processor P[x,y,p] running the calling task. The two (isr_type, isr_channel) arguments define actually the external IRQ to be routed.
     71This function is used when the architecture contains an external IOPIC component. It dynamically allocates an external IRQ signaling completion of an I/O operation to the processor P[x,y,p] running the calling task. The two (isr_type / isr_channel) arguments define actually the external IRQ to be routed.
    7772 * '''isr_type''' : type of ISR
    7873 * '''isr_channel''' : ISR channel (for multi-channels peripherals)