From: jg1.han@samsung.com (Jingoo Han)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] arm64: mm: use ubfm for dcache_line_size
Date: Fri, 17 Jan 2014 17:04:32 +0900 [thread overview]
Message-ID: <000301cf135a$c1390e40$43ab2ac0$%han@samsung.com> (raw)
Use 'ubfm' for the bitfield move instruction; thus, single
instruction can be used instead of two instructions, when
getting the minimum D-cache line size from CTR_EL0 register.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
---
arch/arm64/mm/proc-macros.S | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/arch/arm64/mm/proc-macros.S b/arch/arm64/mm/proc-macros.S
index 8957b82..c31f41e 100644
--- a/arch/arm64/mm/proc-macros.S
+++ b/arch/arm64/mm/proc-macros.S
@@ -38,8 +38,7 @@
*/
.macro dcache_line_size, reg, tmp
mrs \tmp, ctr_el0 // read CTR
- lsr \tmp, \tmp, #16
- and \tmp, \tmp, #0xf // cache line size encoding
+ ubfm \tmp, \tmp, #0x16, 0x19 // cache line size encoding
mov \reg, #4 // bytes per word
lsl \reg, \reg, \tmp // actual cache line size
.endm
--
1.7.10.4
next reply other threads:[~2014-01-17 8:04 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-17 8:04 Jingoo Han [this message]
2014-01-17 11:13 ` [PATCH] arm64: mm: use ubfm for dcache_line_size Will Deacon
2014-01-20 2:04 ` Jingoo Han
2014-01-20 4:28 ` Jingoo Han
2014-01-17 11:22 ` Ard Biesheuvel
2014-01-17 12:24 ` Will Deacon
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