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ARM: proc-v7: clean up MIDR access 

We already have the main ID register available in r9, there's no need
to refetch it.  Use the saved value.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2015-04-04 21:36:35 +01:00
parent 17e7bf8669
commit 4419496884
1 changed files with 4 additions and 5 deletions
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9
arch/arm/mm/proc-v7.S
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@ -409,14 +409,13 @@ __v7_setup:
bl v7_flush_dcache_louis
ldmia r12, {r0-r5, r7, r9, r11, lr}
mrc p15, 0, r0, c0, c0, 0 @ read main ID register
and r10, r0, #0xff000000 @ ARM?
and r10, r9, #0xff000000 @ ARM?
teq r10, #0x41000000
bne __errata_finish
and r3, r0, #0x00f00000 @ variant
and r6, r0, #0x0000000f @ revision
and r3, r9, #0x00f00000 @ variant
and r6, r9, #0x0000000f @ revision
orr r6, r6, r3, lsr #20-4 @ combine variant and revision
ubfx r0, r0, #4, #12 @ primary part number
ubfx r0, r9, #4, #12 @ primary part number
/* Cortex-A8 Errata */
ldr r10, =0x00000c08 @ Cortex-A8 primary part number