ARMv7 may not support Virtualization Extensions
ARMv7-A Virtualization extensions brings new instructions and resources
that were supported by later architectures. Reference ARM ARM Issue C.c
[DDI0406C_C].
ERET and extended MSR/MRS instructions, as specified in [DDI0406C_C] in
ID_PFR1 description of bits[15:12] (Virtualization Extensions):
A value of 0b0001 implies implementation of the HVC, ERET, MRS
(Banked register), and MSR (Banked register) instructions. The ID_ISARs
do not identify whether these instructions are implemented.
UDIV/SDIV were introduced with the Virtualization extensions, even if
not strictly related to the virtualization extensions.
If ARMv7 based platform does not set ARM_CORTEX_Ax=yes, platform
shall define ARMV7_SUPPORTS_VIRTUALIZATION to enable virtualization
extension related resources.
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
diff --git a/make_helpers/armv7-a-cpus.mk b/make_helpers/armv7-a-cpus.mk
index c6491aa..120b36c 100644
--- a/make_helpers/armv7-a-cpus.mk
+++ b/make_helpers/armv7-a-cpus.mk
@@ -36,7 +36,11 @@
#
# ARMV7_SUPPORTS_LARGE_PAGE_ADDRESSING
# Defined if core supports the Large Page Addressing extension.
+#
+# ARMV7_SUPPORTS_VIRTUALIZATION
+# Defined if ARMv7 core supports the Virtualization extension.
ifeq ($(filter yes,$(ARM_CORTEX_A7) $(ARM_CORTEX_A12) $(ARM_CORTEX_A15) $(ARM_CORTEX_A17)),yes)
$(eval $(call add_define,ARMV7_SUPPORTS_LARGE_PAGE_ADDRESSING))
+$(eval $(call add_define,ARMV7_SUPPORTS_VIRTUALIZATION))
endif