From: Pavel Pisa Date: Mon, 12 Feb 2007 22:34:38 +0000 (+0100) Subject: [ARM] 4171/1: i.MX/MX1 optimize interrupt source retrieval X-Git-Tag: v2.6.21-rc1~75^2~11 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3b581f5485c180016a6c36c4c7007e21c53f8a63;p=linux-2.6 [ARM] 4171/1: i.MX/MX1 optimize interrupt source retrieval 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 Acked-by: Sascha Hauer Signed-off-by: Russell King --- diff --git a/include/asm-arm/arch-imx/entry-macro.S b/include/asm-arm/arch-imx/entry-macro.S index 3b9ef69146..61bb0bdc1b 100644 --- a/include/asm-arm/arch-imx/entry-macro.S +++ b/include/asm-arm/arch-imx/entry-macro.S @@ -13,19 +13,13 @@ .endm #define AITC_NIVECSR 0x40 .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 @ interrupt pending. - ldr \irqnr, [\irqstat, #AITC_NIVECSR] + ldr \irqstat, [\base, #AITC_NIVECSR] @ Shift off the priority leaving the offset or - @ "interrupt number" - mov \irqnr, \irqnr, lsr #16 - ldr \irqstat, =1 @ dummy compare - ldr \base, =0xFFFF // invalid interrupt - cmp \irqnr, \base - bne 1001f - ldr \irqstat, =0 -1001: - tst \irqstat, #1 @ to make the condition code = TRUE + @ "interrupt number", use arithmetic shift to + @ transform illegal source (0xffff) as -1 + mov \irqnr, \irqstat, asr #16 + adds \tmp, \irqnr, #1 .endm -