Aarch64 powerdown: add support for GPIO power key #2076
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If ACPI tables are not present in a given Qemu aarch64 instance (e.g. when running an instance with the "virt" machine type and without a UEFI firmware), upon reception of the "system_powerdown" command (which is used to gracefully shut down the instance), Qemu toggles the "poweroff" GPIO instead of generating an ACPI event. Add parsing of GPIO key information from the device tree, and if such information can be found, enable interrupt generation on the PL061 GPIO controller when the poweroff GPIO is toggled, so that the kernel can be shut down by the interrupt handler. This allows a graceful shutdown to be performed when an on-prem instance launched with `ops run --arch=arm64` is terminated with CTRL-C.
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If ACPI tables are not present in a given Qemu aarch64 instance (e.g. when running an instance with the "virt" machine type and without a UEFI firmware), upon reception of the "system_powerdown" command (which is used to gracefully shut down the instance), Qemu toggles the "poweroff" GPIO instead of generating an ACPI event.
This change set adds parsing of GPIO key information from the device tree, and if such information can be found, enables interrupt generation on the PL061 GPIO controller when the poweroff GPIO is toggled, so that the kernel can be shut down by the interrupt handler.
This allows a graceful shutdown to be performed when an on-prem instance launched with
ops run --arch=arm64is terminated with CTRL-C.