arm64: mm: use ubfm for dcache_line_size

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>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/mm/proc-macros.S b/arch/arm64/mm/proc-macros.S
index 8957b822010b474dfaf21d58573ce01a2808883f..005d29e2977da0848248975354c537a4f648d405 100644 (file)
--- 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, #16, #19            // cache line size encoding
        mov     \reg, #4                        // bytes per word
        lsl     \reg, \reg, \tmp                // actual cache line size
        .endm