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OPAL_GET_MSG
------------
OPAL_GET_MSG will get the next pending OPAL Message (see
opal-messages.txt).
Parameters:
buffer to copy message into
sizeof buffer to copy message into
The maximum size of an opal message is specified in the device tree passed
to the host OS:
ibm,opal {
opal-msg-size = <0x48>;
}
It is ALWAYS at least 72 bytes. In the future, OPAL may have messages larger
than 72 bytes. Naturally, a HOST OS will only be able to interpret these
if it correctly uses opal-msg-size. Any OPAL message > 72 bytes, a host OS
may safely ignore.
A host OS *SHOULD* always supply a buffer to OPAL_GET_MSG of either 72
bytes or opal-msg-size. It MUST NOT supply a buffer of < 72 bytes.
Return values:
OPAL_RESOURCE - no available message.
OPAL_PARAMETER - buffer is NULL or size is < 72 bytes.
If buffer size < 72 bytes, the message will NOT be discarded
by OPAL.
OPAL_PARTIAL - If pending opal message is greater than supplied buffer.
In this case the message is *DISCARDED* by OPAL.
This is to keep compatibility with host Operating Systems
with a hard coded opal-msg-size of 72 bytes.
NOT CURRENTLY IMPLEMENTED. Specified so that host OS can
prepare for the possible future with either a sensible
error message or by gracefully ignoring such OPAL messages.
OPAL_SUCCESS - message successfully copied to buffer.
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