bhyve/riscv: Initial import.

Add machine-dependent parts for bhyve hypervisor to support
virtualization on RISC-V ISA.

No objection: markj
Sponsored by: UK Research and Innovation
Differential Revi

bhyve/riscv: Initial import.

Add machine-dependent parts for bhyve hypervisor to support
virtualization on RISC-V ISA.

No objection: markj
Sponsored by: UK Research and Innovation
Differential Revision: https://reviews.freebsd.org/D45512

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bhyve: Support legacy PCI interrupts on arm64

This allows us to remove various #ifdef hacks and enable building more
PCI devices.

Note that a hole is left in the interrupt mapping for the RTC rathe

bhyve: Support legacy PCI interrupts on arm64

This allows us to remove various #ifdef hacks and enable building more
PCI devices.

Note that a hole is left in the interrupt mapping for the RTC rather
than having the two core devices straddle the PCIe interrupts. QEMU's
virt machine also takes this approach.

Reviewed by: jhb
MFC after: 2 weeks
Obtained from: CheriBSD

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