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ARMv7 Generic Timers: Difference between revisions
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* The timers can operate in either physical or virtual time.
* The timers output signals can be configured as level-sensitive PPI IRQ signals to the GICC.
== Security Extentions not implemented ==
* Physical timer and virtual timer.
The virtual timer should be used by PL1 kernels. The physical timer should ideally be left alone.
== Security extensions implemented, no Hypervisor extensions implemented ==
* '''non-secure''' physical timer.
* '''Secure''' physical timer.
* Virtual timer.
The virtual timer should be used by non-secure PL1 kernels.
The secure physical timer should be used by PL3 monitors and '''secure''' PL1 kernels.
The non-secure physical timer should be ideally left alone, and seems to exist solely for the sake of supporting non-secure PL1 kernels which insist on using the physcounter and physical registers instead of the virtcounter and virtual registers.
== Security extensions and hypervisor extensions implemented ==
* '''Non-secure''' PL1 physical timer.
* '''Secure''' PL1 physical timer.
* '''Non-secure''' PL2 physical timer.
* Virtual timer.
The virtual timer should be used by non-secure PL1 kernels.
The secure PL1 physical timer should be used by '''secure''' PL1 kernels.
The '''non-secure''' PL2 physical timer should be used by PL2 hypervisors.
The '''non-secure''' PL1 physical timer should be left alone, ideally and seems to exist solely for the sake of supporting non-secure PL1 kernels that insist on using the physcounter and physical registers instead of the virtcounter and virtual registers.
== Registers ==
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