arm64: vdso: fix clocksource mask when extracting bottom 56 bits
The generic timer clocksource has 56 bits of precision and as such must be masked appropriately after we have read it. The current mask generated by a movn instruction is off by 4 bits, so we accidentally include the top 4 bits in the final value. This patch fixes the broken mask. Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
parent
f2bd5d2406
commit
251db45336
|
@ -223,7 +223,7 @@ ENTRY(__do_get_tspec)
|
|||
/* Calculate cycle delta and convert to ns. */
|
||||
sub x10, x9, x10
|
||||
/* We can only guarantee 56 bits of precision. */
|
||||
movn x9, #0xff0, lsl #48
|
||||
movn x9, #0xff00, lsl #48
|
||||
and x10, x9, x10
|
||||
mul x10, x10, x14
|
||||
lsr x10, x10, x15
|
||||
|
|
Loading…
Reference in a new issue