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[Bug 1001572] New: Separate FIQ and IRQ management


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           Summary: Separate FIQ and IRQ management
           Product: eCos
           Version: CVS
          Platform: All
        OS/Version: ARM
            Status: NEW
          Severity: enhancement
          Priority: low
         Component: HAL
        AssignedTo: unassigned@bugs.ecos.sourceware.org
        ReportedBy: nickg@ecoscentric.com
                CC: ecos-bugs@ecos.sourceware.org
             Class: Advice Request


Created an attachment (id=1712)
 --> (http://bugs.ecos.sourceware.org/attachment.cgi?id=1712)
FIQ patch

This patch implements the separation of FIQ and IRQ in eCos critical sections.
The default is to continue disabling both FIQ and IRQ as at present. If
CYGOPT_HAL_ARM_FIQ_DISABLE is switched off then eCos will only manipulate IRQs
in HAL_DISABLE|ENABLE|RESTORE_INTERRUPTS FIQs will be untouched. This puts FIQs
entirely outside eCos, they cannot interact with the kernel through standard
means, and any FIQ handler must be written to run directly from the VSR, it
cannot be installed via the usual interrupt API.

To make FIQs easy to control, if FIQ and IRQ are separated, a set of FIQ
control macros, HAL_DISABLE|ENABLE|RESTORE|QUERY_FIQ, are enabled.


I'll check this in in a few days if nobody has any objections.

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