The DT spec describes the stdout-path property in the /chosen node to
contain the DT path for a default device usable for outputting characters.
The Linux kernel uses this for earlycon (without further parameters),
other DT users might rely on this as well.

Add a stdout-path property pointing to the "serial0" alias, then add an
aliases node at the end of the FDT, containing the actual path. This
allows the FDT generation code in hw/serial.c to set this string.

Even when we use the virtio console, the serial console is still there
and works, so we can expose this unconditionally. Putting the virtio
console path in there will not work anyway.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

The current implementation of fdt__alloc_phandle() suffers from being
implemented in a static inline function situated in a header file.
This will only create expected results within a single compilation
unit.
It seems a bit over the top to use a function to allocate phandles,
when at the end of the day a phandle is just a unique identifier.
To simplify things - especially with upcoming patches - we just
introduce an enum per architecture to hold all possible phandle sources
and use that instead of the dynamic allocation.
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

kvmtool used the in-kernel version of the device tree handling
library. Now that we are a proper userland tool, use the system's
library for that purpose. Actually this seems to fix some
long-standing warning generated by the Linux copy.
Also fix up a bogus x86 warning (no FDT needed here).
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

We had GIC specific defines for the IRQ type identifiers in kvmtool.
But in fact the specification of being a level or edge interrupt
is quite generic, with the GIC binding using the generic Linux
defines.
So lets replace the GIC specific #defines in favour of the more
general names copied from Linux' include/linux/irq.h.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

The _FDT macro is useful when generating device trees for a guest, so
make it available to other architectures.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>