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README.irq @ 8f8ccee

Last change on this file since 8f8ccee was 8f8ccee, checked in by Sebastian Huber <sebastian.huber@…>, on 04/23/18 at 07:50:39

bsps: Move interrupt controller support to bsps

This patch is a part of the BSP source reorganization.

Update #3285.

File size: 810 bytes

Rev	Line
[ee732739]	1	README.irq : Shuchen Kate Feng <feng1@bnl.gov>, Sept. 2, 2007
[7be6ad9]	2
[ee732739]	3	As per implementation in shared PPC code,
	4	the BSPirqPrioTable[96] listed in irq_init.c is where the
[7be6ad9]	5	software developers can change the levels of priority
[ee732739]	6	for all the interrupts based on the need of their
	7	applications. The IRQs can be eanbled dynamically via the
	8	BSP_enable_pic_irq(), or disbaled dynamically via the
	9	BSP_disable_pic_irq().
[7be6ad9]	10
	11
[ee732739]	12	Support for run-time priority setup could be
	13	added easily, but there is no action taken yet due to concerns
	14	over computer security at VME CPU level.
[7be6ad9]	15
	16
[ee732739]	17	The software developers are forbidden to setup picIsrTable[],
	18	as it is a powerful engine for the BSP to find the pending
	19	highest priority IRQ at run time. It ensures the fastest/faster
	20	interrupt service to the highest/higher priority IRQ, if pending.

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