[RTEMS Project] #4248: PowerPC shared ISA IRQ support is broken (cloned)

[RTEMS trac]

#4248: PowerPC shared ISA IRQ support is broken (cloned)
--------------------------+---------------------------------
  Reporter:  Chris Johns  |      Owner:  Chris Johns
      Type:  defect       |     Status:  assigned
  Priority:  normal       |  Milestone:  5.2
 Component:  bsps         |    Version:  5
  Severity:  normal       |   Keywords:  i8258 irq interrupt
Blocked By:               |   Blocking:
--------------------------+---------------------------------
 Cloned from #4239:
 ----
 The PowerPC shared ISA IRQ management in `i8259s.c` is broken. It fails to
 handle:

 - Interrupt acknowledgements for the slave controller when the master has
 a lower priority pending interrupt acknowledge the slave and the master
 controllers

 - The nesting support to suspend and resume an interrupt does not
 correctly handle the enable/disable

 - The initialise of an interrupt does not handle any pending request

 - Locks up when using with the IRQ server which is executing the handler
 in a task context

 All these issues have been fixed in the `i386` BSP however the code
 between is not shared as the `i386` BSP has BSP specific IRQ management
 code as well.

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Ticket URL: <http://devel.rtems.org/ticket/4248>
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