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netx: Use get_irqnr_preamble to initialize base register

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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>
This commit is contained in:
Uwe Kleine-König
2009-08-13 20:38:16 +02:00
parent ed680c4ad4
commit b88fb83b13
1 changed files with 1 additions and 3 deletions
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4
arch/arm/mach-netx/include/mach/entry-macro.S
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@@ -24,15 +24,13 @@
.endm .endm
.macro get_irqnr_preamble, base, tmp .macro get_irqnr_preamble, base, tmp
ldr \base, =io_p2v(0x001ff000)
.endm .endm
.macro arch_ret_to_user, tmp1, tmp2 .macro arch_ret_to_user, tmp1, tmp2
.endm .endm
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp .macro get_irqnr_and_base, irqnr, irqstat, base, tmp
mov \base, #io_p2v(0x00100000)
add \base, \base, #0x000ff000
ldr \irqstat, [\base, #0] ldr \irqstat, [\base, #0]
clz \irqnr, \irqstat clz \irqnr, \irqstat
rsb \irqnr, \irqnr, #31 rsb \irqnr, \irqnr, #31