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[1/2] arm64: Clear OSDLR_EL1 on CPU boot

Message ID 20190408171719.44711-2-jean-philippe.brucker@arm.com (mailing list archive)
State New, archived
Headers show
Series arm64: Clear OS Double Lock Register | expand

Commit Message

Jean-Philippe Brucker April 8, 2019, 5:17 p.m. UTC 
Some firmwares may reboot CPUs with OS Double Lock set. Make sure that
it is unlocked, in order to use debug exceptions.

Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
---
 arch/arm64/kernel/debug-monitors.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c
index d7bb6aefae0a..0fa6db521e44 100644
--- a/arch/arm64/kernel/debug-monitors.c
+++ b/arch/arm64/kernel/debug-monitors.c
@@ -135,6 +135,7 @@  NOKPROBE_SYMBOL(disable_debug_monitors);
  */
 static int clear_os_lock(unsigned int cpu)
 {
+	write_sysreg(0, osdlr_el1);
 	write_sysreg(0, oslar_el1);
 	isb();
 	return 0;