GIC: Introduce API to get interrupt ID
Acknowledging interrupt shall return a raw value from the interrupt
controller in which the actual interrupt ID may be encoded. Add a
platform API to extract the actual interrupt ID from the raw value
obtained from interrupt controller.
Document the new function. Also clarify the semantics of interrupt
acknowledge.
Change-Id: I818dad7be47661658b16f9807877d259eb127405
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
diff --git a/plat/common/plat_gicv3.c b/plat/common/plat_gicv3.c
index 52ceb6a..030eea7 100644
--- a/plat/common/plat_gicv3.c
+++ b/plat/common/plat_gicv3.c
@@ -271,6 +271,14 @@
{
return gicv3_set_pmr(mask);
}
+
+unsigned int plat_ic_get_interrupt_id(unsigned int raw)
+{
+ unsigned int id = (raw & INT_ID_MASK);
+
+ return (gicv3_is_intr_id_special_identifier(id) ?
+ INTR_ID_UNAVAILABLE : id);
+}
#endif
#ifdef IMAGE_BL32