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Signed-off-by: Helge Deller <deller@gmx.de>
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On x86 I/O ports are located below address 0x4000, while
on PA-RISC I/O ports are allowed in the whole 32/64 bit
address space.
So, introduce a portaddr_t typedef which defaults to the
current u16 type on x86 and to unsigned long on PA-RISC.
Signed-off-by: Helge Deller <deller@gmx.de>
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xen_preinit() runs early and changes DebugOutputPort. qemu_preinit() runs
soon after. inb on DebugOutputPort doesn't work on Xen, so the check
will always fail and DebugOutputPort will be cleared to 0 disabling
output.
Quick exit the function when running on Xen to preserve the modified
DebugOutputPort.
Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
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In order to speed up the boot phase, we can check the QEMU
debugcon device, and disable the writes if it is not recognized.
This patch allow us to save around 10 msec (time measured
between SeaBIOS entry point and "linuxboot" entry point)
when CONFIG_DEBUG_LEVEL=1 and debugcon is not enabled.
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Some chipsets have memory mapped serial ports. The protocol is the same
as an standard uart, but with memory read/write instead of inb/outb.
Tested-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Avoid hardware specific code in output.c. This will reduce the amount
of change needed to output.c as support for more serial hardware is
added.
This patch also renames some functions to improve the naming scheme.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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