feat(hcx): add build option to enable FEAT_HCX
FEAT_HCX adds the extended hypervisor configuration register (HCRX_EL2)
and access to this register must be explicitly enabled through the
SCR_EL3.HXEn bit. This patch adds a new build flag ENABLE_FEAT_HCX to
allow the register to be accessed from EL2.
Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: Ibb36ad90622f1dc857adab4b0d4d7a89456a522b
diff --git a/include/arch/aarch64/arch_features.h b/include/arch/aarch64/arch_features.h
index dc0b7f3..3ff67e5 100644
--- a/include/arch/aarch64/arch_features.h
+++ b/include/arch/aarch64/arch_features.h
@@ -117,4 +117,10 @@
ID_AA64PFR1_MPAM_FRAC_SHIFT) & ID_AA64PFR1_MPAM_FRAC_MASK));
}
+static inline bool is_feat_hcx_present(void)
+{
+ return (((read_id_aa64mmfr1_el1() >> ID_AA64MMFR1_EL1_HCX_SHIFT) &
+ ID_AA64MMFR1_EL1_HCX_MASK) == ID_AA64MMFR1_EL1_HCX_SUPPORTED);
+}
+
#endif /* ARCH_FEATURES_H */