GIC: Add API to raise secure SGI
API documentation updated.
Change-Id: I129725059299af6cc612bafa8d74817f779d7c4f
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
diff --git a/drivers/arm/gic/v3/gicv3_main.c b/drivers/arm/gic/v3/gicv3_main.c
index 04b4712..a506732 100644
--- a/drivers/arm/gic/v3/gicv3_main.c
+++ b/drivers/arm/gic/v3/gicv3_main.c
@@ -960,3 +960,42 @@
spin_unlock(&gic_lock);
}
}
+
+/*******************************************************************************
+ * This function raises the specified Secure Group 0 SGI.
+ *
+ * The target parameter must be a valid MPIDR in the system.
+ ******************************************************************************/
+void gicv3_raise_secure_g0_sgi(int sgi_num, u_register_t target)
+{
+ unsigned int tgt, aff3, aff2, aff1, aff0;
+ uint64_t sgi_val;
+
+ /* Verify interrupt number is in the SGI range */
+ assert((sgi_num >= MIN_SGI_ID) && (sgi_num < MIN_PPI_ID));
+
+ /* Extract affinity fields from target */
+ aff0 = MPIDR_AFFLVL0_VAL(target);
+ aff1 = MPIDR_AFFLVL1_VAL(target);
+ aff2 = MPIDR_AFFLVL2_VAL(target);
+ aff3 = MPIDR_AFFLVL3_VAL(target);
+
+ /*
+ * Make target list from affinity 0, and ensure GICv3 SGI can target
+ * this PE.
+ */
+ assert(aff0 < GICV3_MAX_SGI_TARGETS);
+ tgt = BIT(aff0);
+
+ /* Raise SGI to PE specified by its affinity */
+ sgi_val = GICV3_SGIR_VALUE(aff3, aff2, aff1, sgi_num, SGIR_IRM_TO_AFF,
+ tgt);
+
+ /*
+ * Ensure that any shared variable updates depending on out of band
+ * interrupt trigger are observed before raising SGI.
+ */
+ dsbishst();
+ write_icc_sgi0r_el1(sgi_val);
+ isb();
+}