All the kernel header files now use pargma once rather than the ifndef,
as the pre-processed C files do not change while header files
are protected with pargma once. This will also solve any naming issues
caused by ifndef.
This commit also converts our own copyright headers to directly use
SPDX, but leaves all other copyright header intact, only adding the
SPDX ident. As far as possible this commit also merges multiple
Data61 copyright statements/headers into one for consistency.
Added support for reading and writing additional virtual timer
registers for vcpu hw read and write accesses. These include the
compare value register (CNTV_CVAL) and offset register (CNTV_OFF),
each represented as two 32 bit (high and low) registers on aarch32 and
as single 64 bit registers on aarch64.
Added support for explicitly saving and restoring the virtual
timer registers when the vcpu is enabled and disabled. This
ensures when the vcpu is switched in and out, the virtual timer
registers are restored to a state that is consistent to when
it was last run.
By default the CNTVOFF register will be updated by the kernel to
accumulate the time the VCPU is not running. From the guest this will
result in the VCNT register not increasing when the VCPU is suspended.
This behavior can be turned off by disabling the
KernelArmVtimerUpdateVOffset config option.
Update the generic timer to implement the MCS kernels tickless timer
driver API and update all platforms that use the arm generic timers:
- bcm2837
- exynos5
- hikey
- imx7
- odroidc2
- tk1
- tx1
- tx2
- zynq7000
Also move the generic timer constants to machine.h to avoid a circular
dependency.
