hvc_xen: add earlycon support

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Introduce EARLYCON support in hvc_xen, useful for early debugging on arm
and arm64, where xen early_printk is not available.

It is different from xenboot_write_console on x86 in two ways:

- it does not return if !xen_pv_domain(), not only because ARM guests
  are xen_hvm_domain(), but also because we want to capture all the
  early boot messages, before xen support is discovered
- it does not try to print to the domU console at all, because xen
  support will only be discovered at a later point

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

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This commit is contained in:

Stefano Stabellini 2016-02-25 12:10:37 +00:00

parent 81f70ba233

commit 16e506efc0

1 changed files with 16 additions and 0 deletions

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drivers/tty/hvc/hvc_xen.c

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