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arm64: mm: use ubfm for dcache_line_size

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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 <[email protected]>
Acked-by: Will Deacon <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>
This commit is contained in:
Jingoo Han 2014-01-20 05:00:21 +00:00 • committed by Catalin Marinas
commit bd5f6dc304
1 changed files with 1 additions and 2 deletions
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3
arch/arm64/mm/proc-macros.S
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@ -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, #16, #19 // cache line size encoding
mov \reg, #4 // bytes per word
lsl \reg, \reg, \tmp // actual cache line size
.endm