Multiprocessor Support
http://www.mcg.mot.com/literature
3-21
3
The status codes that may be set by the bus master are:
The Multiprocessor Address Register (MPAR), located in shared RAM
location of $804 offset from the base address the debugger loads it at,
contains the second of two longwords used to control communication
between processors. The MPAR contents specify the address at which
execution for the remote processor is to begin if the MPCR contains a G or
B. The MPAR is organized as follows:
At power-up, the debug monitor self-test routines initialize RAM,
including the memory locations used for multiprocessor support ($800
through $807).
The MPCR contains $00 at power-up, indicating that initialization is not
yet complete. As initialization proceeds, the execution path comes to the
"prompt" routine. Before sending the prompt, this routine places an R in
the MPCR to indicate that initialization is complete. Then the prompt is
sent.
If no terminal is connected to the port, the MPCR is still polled to see
whether an external processor requires control to be passed to the dual-port
RAM. If a terminal does respond, the MPCR is polled for the same purpose
while the serial port is being polled for user input.
An ASCII G placed in the MPCR by a remote processor indicates that the
Go Direct type of transfer is requested. An ASCII B in the MPCR indicates
that breakpoints are to be armed before control is transferred (as with the
GO command).
In either sequence, an E is placed in the MPCR to indicate that execution
is underway just before control is passed to RAM (any remote processor
could examine the MPCR contents).
ASCII
G
(HEX 47)
-
Use Go Direct (GD) logic specifying the
MPAR address.
ASCII
B
(HEX 42)
-
Install breakpoints using the Go (G) logic.
$804
*
*
*
*
(MPAR)
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