Commit b88fb83b authored Aug 13, 2009 by Uwe Kleine-König

netx: Use get_irqnr_preamble to initialize base register

This patch optimizes the irq handling a bit. Now the base register is
only computed once per irq exception instead of at least twice.
Moreover the mov+add sequence is simplified to an ldr (which might save
some cycles depending on memory timing).

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

parent ed680c4a

arch/arm/mach-netx/include/mach/entry-macro.S

+1 −3

Original line number	Diff line number	Diff line
		@@ -24,15 +24,13 @@
		.endm

		.macro get_irqnr_preamble, base, tmp
		ldr \base, =io_p2v(0x001ff000)
		.endm

		.macro arch_ret_to_user, tmp1, tmp2
		.endm

		.macro get_irqnr_and_base, irqnr, irqstat, base, tmp
		mov \base, #io_p2v(0x00100000)
		add \base, \base, #0x000ff000

		ldr \irqstat, [\base, #0]
		clz \irqnr, \irqstat
		rsb \irqnr, \irqnr, #31