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This is an adaptation of what we currently do for op_display() on FSP
machines, inventing an encoding for what we can write into the single
byte at LPC port 80h.
Port 80h is often used on x86 systems to indicate boot progress/status
and dates back a decent amount of time. Since a byte isn't exactly very
expressive for everything that can go on (and wrong) during boot, it's
all about compromise.
Some systems (such as Zaius/Barreleye G2) have a physical dual 7 segment
display that display these codes. So far, this has only been driven by
hostboot (see hostboot commit 90ec2e65314c).
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
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In the function __opal_write_oppanel() coverity complains about an out
of bounds array access. While the pointer is never actually dereferenced,
this isn't immediately obvious from the code. Additionally the number and
length of the lines on the operator panel display are hard coded into
the function. While we are here we might as well move these into a #define
statement.
Rework the code in __opal_write_oppanel() where the message is copied into
the buffer so that coverity won't complain about an out of bounds array
access and so that it is line number and length agnostic (now relying on
the #defined values).
Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Reviewed-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
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Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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