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[ARM] 4171/1: i.MX/MX1 optimize interrupt source retrieval

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The macro "get_irqnr_and_base" in "entry-macro.S" optimized
according to Lennert Buytenhek suggestion.

Comments from Pavel Pisa:

 Sascha has approved patch some days ago

Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Pavel Pisa
2007-02-12 23:34:38 +01:00
committed by Russell King
parent cb36bb7516
commit 3b581f5485
1 changed files with 6 additions and 12 deletions
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include/asm-arm/arch-imx/entry-macro.S
+6 -12
View File
@@ -13,19 +13,13 @@
.endm .endm
#define AITC_NIVECSR 0x40 #define AITC_NIVECSR 0x40
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp .macro get_irqnr_and_base, irqnr, irqstat, base, tmp
ldr \irqstat, =IO_ADDRESS(IMX_AITC_BASE) ldr \base, =IO_ADDRESS(IMX_AITC_BASE)
@ Load offset & priority of the highest priority @ Load offset & priority of the highest priority
@ interrupt pending. @ interrupt pending.
ldr \irqnr, [\irqstat, #AITC_NIVECSR] ldr \irqstat, [\base, #AITC_NIVECSR]
@ Shift off the priority leaving the offset or @ Shift off the priority leaving the offset or
@ "interrupt number" @ "interrupt number", use arithmetic shift to
mov \irqnr, \irqnr, lsr #16 @ transform illegal source (0xffff) as -1
ldr \irqstat, =1 @ dummy compare mov \irqnr, \irqstat, asr #16
ldr \base, =0xFFFF // invalid interrupt adds \tmp, \irqnr, #1
cmp \irqnr, \base
bne 1001f
ldr \irqstat, =0
1001:
tst \irqstat, #1 @ to make the condition code = TRUE
.endm .endm