arm64/vmm: Teach the switcher about new registers

To support booting the kernel in EL2 some of the EL0 and EL1 registers
are changed to point to an EL2 version. To get access to the EL0/EL1
version

arm64/vmm: Teach the switcher about new registers

To support booting the kernel in EL2 some of the EL0 and EL1 registers
are changed to point to an EL2 version. To get access to the EL0/EL1
version of these registers we need to use the new EL02 and EL12
registers, e.g. to access elr_el1 from the host we would use elr_el12.

Add macros that can be different on VHE vs non-VHE code so these
registers can be accessed in the correct way.

Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D46078

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arm64/vmm: Move nVHE-only code to the new file

There are some functions that are only needed in non-VHE mode. These
are used to handle hypervisor calls from the kernel, and to manage the
page tables

arm64/vmm: Move nVHE-only code to the new file

There are some functions that are only needed in non-VHE mode. These
are used to handle hypervisor calls from the kernel, and to manage the
page tables in EL2. As these won't be used by the VHE code we can move
them to the non-VHE specific files.

Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D46073

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arm64/vmm: Start to extract code not needed by VHE

We can share some of the vmm code between VHE and non-VHE modes. To
support this create new files that include the common code and create
macros to

arm64/vmm: Start to extract code not needed by VHE

We can share some of the vmm code between VHE and non-VHE modes. To
support this create new files that include the common code and create
macros to name what will be the common functions.

Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D46072

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