Author: andrew
Date: Wed Aug 12 17:06:22 2015
New Revision: 286674
URL: https://svnweb.freebsd.org/changeset/base/286674
Log:
Set the counter-timer virtual offset to a know value, it may not have been
set by the boot code and are reset to an implementation defined value that
may be unknown.
Sponsored by: ABT Systems Ltd
Modified:
head/sys/arm64/arm64/locore.S
Modified: head/sys/arm64/arm64/locore.S
==============================================================================
--- head/sys/arm64/arm64/locore.S Wed Aug 12 16:53:37 2015
(r286673)
+++ head/sys/arm64/arm64/locore.S Wed Aug 12 17:06:22 2015
(r286674)
@@ -220,6 +220,14 @@ drop_to_el1:
/* Don't trap to EL2 for CP15 traps */
msr hstr_el2, xzr
+ /* Enable access to the physical timers at EL1 */
+ mrs x2, cnthctl_el2
+ orr x2, x2, #(CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN)
+ msr cnthctl_el2, x2
+
+ /* Set the counter offset to a known value */
+ msr cntvoff_el2, xzr
+
/* Hypervisor trap functions */
adr x2, hyp_vectors
msr vbar_el2, x2
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