source:
rtems/bsps/powerpc/mvme5500/README.irq
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1 | README.irq : Shuchen Kate Feng <feng1@bnl.gov>, Sept. 2, 2007 |
2 | |
3 | As per implementation in shared PPC code, |
4 | the BSPirqPrioTable[96] listed in irq_init.c is where the |
5 | software developers can change the levels of priority |
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(). |
10 | |
11 | |
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. |
15 | |
16 | |
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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