For FEAT_ECV, new registers CNTPCTSS_EL0 and CNTVCTSS_EL0 are
defined, which are "self-synchronized" views of the physical and
virtual counts as seen in the CNTPCT_EL0 and CNTVCT_EL0 registers
(meaning that no barriers are needed around accesses to them to
ensure that reads of them do not occur speculatively and out-of-order
with other instructions).
For QEMU, all our system registers are self-synchronized, so we can
simply copy the existing implementation of CNTPCT_EL0 and CNTVCT_EL0
to the new register encodings.
This means we now implement all the functionality required for
ID_AA64MMFR0_EL1.ECV == 0b0001.
Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
---
target/arm/helper.c | 43 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)