Commit 6fda41bf authored by Jean-Philippe Brucker's avatar Jean-Philippe Brucker Committed by Will Deacon

arm64: Clear OSDLR_EL1 on CPU boot

Some firmwares may reboot CPUs with OS Double Lock set. Make sure that
it is unlocked, in order to use debug exceptions.

Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarJean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 475ba3fc
...@@ -135,6 +135,7 @@ NOKPROBE_SYMBOL(disable_debug_monitors); ...@@ -135,6 +135,7 @@ NOKPROBE_SYMBOL(disable_debug_monitors);
*/ */
static int clear_os_lock(unsigned int cpu) static int clear_os_lock(unsigned int cpu)
{ {
write_sysreg(0, osdlr_el1);
write_sysreg(0, oslar_el1); write_sysreg(0, oslar_el1);
isb(); isb();
return 0; return 0;
......
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