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| author | Etienne Carriere <etienne.carriere@linaro.org> | 2017-11-08 14:38:33 +0100 |
|---|---|---|
| committer | Etienne Carriere <etienne.carriere@linaro.org> | 2017-11-08 14:38:33 +0100 |
| commit | 64cc6e91e819ccbf5fe3bf8a5c177b8fa8012d8c (patch) | |
| tree | 6cc714edf449c3e44fde7840598d30089edd9f57 /make_helpers | |
| parent | 51b992ecec92b9dcca410a2c3716f45daca5afd1 (diff) | |
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>
Diffstat (limited to 'make_helpers')
| -rw-r--r-- | make_helpers/armv7-a-cpus.mk | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/make_helpers/armv7-a-cpus.mk b/make_helpers/armv7-a-cpus.mk index c6491aa8..120b36c7 100644 --- a/make_helpers/armv7-a-cpus.mk +++ b/make_helpers/armv7-a-cpus.mk @@ -36,7 +36,11 @@ endif # # 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 |