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authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>2009-08-13 20:38:16 +0200
committerUwe Kleine-König <u.kleine-koenig@pengutronix.de>2009-08-13 20:34:36 +0200
commitb88fb83b138d4a377abea9461b2d58b9bf8ad9fe (patch)
treea57b501db597bebf03b69dee0267272f3fe4ef26 /arch/arm/mach-netx
parented680c4ad478d0fee9740f7d029087f181346564 (diff)
downloadop-kernel-dev-b88fb83b138d4a377abea9461b2d58b9bf8ad9fe.zip
op-kernel-dev-b88fb83b138d4a377abea9461b2d58b9bf8ad9fe.tar.gz
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>
Diffstat (limited to 'arch/arm/mach-netx')
-rw-r--r--arch/arm/mach-netx/include/mach/entry-macro.S4
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/arm/mach-netx/include/mach/entry-macro.S b/arch/arm/mach-netx/include/mach/entry-macro.S
index a1952a0..844f1f9 100644
--- a/arch/arm/mach-netx/include/mach/entry-macro.S
+++ b/arch/arm/mach-netx/include/mach/entry-macro.S
@@ -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
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