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OPAL_SYNC_HOST_REBOOT
=====================
static int64_t opal_sync_host_reboot(void)
This OPAL call halts asynchronous operations in preparation for something
like kexec. It will halt DMA as well notification of some events (such
as a new error log being available for retreival).
It's meant to be called in a loop until OPAL_SUCCESS is returned.
Returns:
- OPAL_SUCCESS: Success!
- OPAL_BUSY_EVENT: not yet complete, call opal_sync_host_reboot() again, possibly with a short delay.
- OPAL_BUSY: Call opal_poll_events() and then retry opal_sync_host_reboot
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