From 1f75ff0a3d63606c1345e316e88a903fd43ca8be Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Thu, 29 Nov 2012 22:48:31 +0000 Subject: arm64: generic timer: use virtual counter instead of physical at EL0 We want to use the virtual counter at EL0, as the physical counter may not track the current clocksource for guests running under a hypervisor. This patch updates the vdso and generic timer driver to use the virtual counter. The kernel EL2 entry code is also updated to ensure that the virtual offset is initialised to zero. Signed-off-by: Marc Zyngier Signed-off-by: Will Deacon Signed-off-by: Catalin Marinas --- arch/arm64/kernel/vdso/gettimeofday.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'arch/arm64/kernel/vdso') diff --git a/arch/arm64/kernel/vdso/gettimeofday.S b/arch/arm64/kernel/vdso/gettimeofday.S index 6681f4032260..8bf658d974f9 100644 --- a/arch/arm64/kernel/vdso/gettimeofday.S +++ b/arch/arm64/kernel/vdso/gettimeofday.S @@ -220,9 +220,9 @@ ENTRY(__do_get_tspec) ldp w11, w12, [vdso_data, #VDSO_CS_MULT] seqcnt_read w9 - /* Read the physical counter. */ + /* Read the virtual counter. */ isb - mrs x15, cntpct_el0 + mrs x15, cntvct_el0 /* Calculate cycle delta and convert to ns. */ sub x10, x15, x10 -- cgit v1.2.3