RFC: new RTEMS IRQ requirements

[eric.valette at free.fr (Valette Eric)]

Joel Sherrill wrote:

> I wouldn't mind seeing the implementation either call the PIC vectoring
> code as a subroutine or be broken into "prologue" and "epilogue" files
> which
> are concatenated with a "PIC vectoring" file to do the BSP/PIC specific 
> dirty work.
> 
> I know it is an implementation detail but I don't like duplication and 
> I especially don't like duplicating code like the ISR handling code. 
> I am sure Till is tired of looking at all the various versions of the
> same PPC assembly code by now. :)

May I suggest to use m4 macros instead of cpp

------------------ sample ---------------------

define(INTR_BASE_NUMBER, 192)

define(`INTR_ENTER',`
	/
	/ save scratch registers
	/
	pushl	%eax
	pushl	%ecx
	pushl	%edx

	movl	$ $1 + INTR_BASE_NUMBER, %ecx
')

ENTRY(irq0)
	INTR_ENTER(0)
	jmp common;




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