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[ARM] 4688/1: at91: speed-up irq processing 

Save N instructions on every interrupt processing (where N is the
number of interrupts processed in any one IRQ exception).

Signed-off-by: Marc Pignat <marc.pignat@hevs.ch>
Acked-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Marc Pignat 2007-12-03 12:58:24 +01:00 committed by Russell King
parent 9ebbec27da
commit 156864f806
1 changed files with 1 additions and 1 deletions
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2
include/asm-arm/arch-at91/entry-macro.S
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@ -17,13 +17,13 @@
.endm
.macro get_irqnr_preamble, base, tmp
ldr \base, =(AT91_VA_BASE_SYS + AT91_AIC) @ base virtual address of AIC peripheral
.endm
.macro arch_ret_to_user, tmp1, tmp2
.endm
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp
ldr \base, =(AT91_VA_BASE_SYS + AT91_AIC) @ base virtual address of AIC peripheral
ldr \irqnr, [\base, #(AT91_AIC_IVR - AT91_AIC)] @ read IRQ vector register: de-asserts nIRQ to processor (and clears interrupt)
ldr \irqstat, [\base, #(AT91_AIC_ISR - AT91_AIC)] @ read interrupt source number
teq \irqstat, #0 @ ISR is 0 when no current interrupt, or spurious interrupt