feat(d128): add support for FEAT_D128
This patch disables trapping to EL3 when the FEAT_D128
specific registers are accessed by setting the SCR_EL3.D128En bit.
If FEAT_D128 is implemented, then FEAT_SYSREG128 is implemented.
With FEAT_SYSREG128 certain system registers are treated as 128-bit,
so we should be context saving and restoring 128-bits instead of 64-bit
when FEAT_D128 is enabled.
FEAT_SYSREG128 adds support for MRRS and MSRR instruction which
helps us to read write to 128-bit system register.
Refer to Arm Architecture Manual for further details.
Change the FVP platform to default to handling this as a dynamic option
so the right decision can be made by the code at runtime.
Change-Id: I1a53db5eac29e56c8fbdcd4961ede3abfcb2411a
Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
diff --git a/common/feat_detect.c b/common/feat_detect.c
index e63eec4..6aa5e2e 100644
--- a/common/feat_detect.c
+++ b/common/feat_detect.c
@@ -269,6 +269,12 @@
ID_AA64MMFR3_EL1_SCTLR2_MASK);
}
+static unsigned int read_feat_d128_id_field(void)
+{
+ return ISOLATE_FIELD(read_id_aa64mmfr3_el1(), ID_AA64MMFR3_EL1_D128_SHIFT,
+ ID_AA64MMFR3_EL1_D128_MASK);
+}
+
/***********************************************************************************
* TF-A supports many Arm architectural features starting from arch version
* (8.0 till 8.7+). These features are mostly enabled through build flags. This
@@ -394,6 +400,10 @@
check_feature(ENABLE_SME2_FOR_NS, read_feat_sme_id_field(),
"SME2", 2, 2);
+ /* v9.3 features */
+ check_feature(ENABLE_FEAT_D128, read_feat_d128_id_field(),
+ "D128", 1, 1);
+
/* v9.4 features */
check_feature(ENABLE_FEAT_GCS, read_feat_gcs_id_field(), "GCS", 1, 1);
check_feature(ENABLE_RME, read_feat_rme_id_field(), "RME", 1, 1);