[PATCH 4/4] efi_loader: call smp_kick_all_cpus()

[Michael Walle]

On some architectures, specifically the layerscape, the secondary cores
wait for an interrupt before entering the spin-tables. This applies only
to boards which doesn't have PSCI provided by TF-a and u-boot does the
secondary cores handling.
bootm/booti already call that function for ARM architecture; also add it
to bootelf before switching to EL2. Additionally, provide a weak noop
function so we don't have to have "#ifdef CONFIG_ARM64" guards.

Signed-off-by: Michael Walle <michael at walle.cc>
---
 common/bootm.c             | 9 +++++++++
 lib/efi_loader/efi_setup.c | 6 ++++++
 2 files changed, 15 insertions(+)

diff --git a/common/bootm.c b/common/bootm.c
index db4362a643..65adf29329 100644
--- a/common/bootm.c
+++ b/common/bootm.c
@@ -816,6 +816,15 @@ void __weak switch_to_non_secure_mode(void)
 {
 }
 
+/**
+ * smp_kick_all_cpus() - kick all CPUs
+ *
+ * This routine is overridden by architectures requiring this feature.
+ */
+void __weak smp_kick_all_cpus(void)
+{
+}
+
 #else /* USE_HOSTCC */
 
 #if defined(CONFIG_FIT_SIGNATURE)
diff --git a/lib/efi_loader/efi_setup.c b/lib/efi_loader/efi_setup.c
index 26a7423203..7e5364adc5 100644
--- a/lib/efi_loader/efi_setup.c
+++ b/lib/efi_loader/efi_setup.c
@@ -132,6 +132,12 @@ efi_status_t efi_init_obj_list(void)
 	/* Allow unaligned memory access */
 	allow_unaligned();
 
+	/*
+	 * Some architectures need to kick secondary cores to enter their
+	 * spin table.
+	 */
+	smp_kick_all_cpus();
+
 	/* On ARM switch from EL3 or secure mode to EL2 or non-secure mode */
 	switch_to_non_secure_mode();
 
-- 
2.20.1