refactor(cpufeat): separate the EL2 and EL3 enablement code
Combining the EL2 and EL3 enablement code necessitates that it must be
called at el3_exit, which is the only place with enough context to make
the decision of what needs to be set.
Decouple them to allow them to be called from elsewhere.
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: I147764c42771e7d4100699ec8fae98dac0a505c0
diff --git a/lib/extensions/sve/sve.c b/lib/extensions/sve/sve.c
index f551ca7..eb4ac8d 100644
--- a/lib/extensions/sve/sve.c
+++ b/lib/extensions/sve/sve.c
@@ -37,6 +37,16 @@
(ZCR_EL3_LEN_MASK & CONVERT_SVE_LENGTH(SVE_VECTOR_LEN)));
}
+void sve_init_el2_unused(void)
+{
+ /*
+ * CPTR_EL2.TFP: Set to zero so that Non-secure accesses to Advanced
+ * SIMD and floating-point functionality from both Execution states do
+ * not trap to EL2.
+ */
+ write_cptr_el2(read_cptr_el2() & ~CPTR_EL2_TFP_BIT);
+}
+
void sve_disable(cpu_context_t *context)
{
u_register_t reg;