[OpenBIOS] [PATCH] sparc32: add sbus-intr>cpu for sun4m

Mark Cave-Ayland mark.cave-ayland at siriusit.co.uk
Sat Aug 20 10:37:10 CEST 2011

On 20/08/11 06:11, Bob Breuer wrote:

>> Unfortunately I have no way of testing what the output should be for any
>> given input for this function, but to my untrained eye the general patch
>> style/location look fine. The only thing I'd like to see is a stack
>> diagram for the sun4m-sbus-intr>cpu word at which point if no-one else
>> objects then I'm happy to commit.
> Ah, I forgot a pointer to something resembling documentation.  I used
> the Linux source file arch/sparc/kernel/sun4m_irq.c.  To get the
> resulting value for intr, the low 4 bits are the PIL, and the upper 4
> bits correspond to 0x30 for SBUS.

That's great - a comment within tree.fs next to the sun4m-sbus-inter>cpu 
would be fine for me.

> If someone could show how this C snippet might translate into forth:
>      static const uint8_t map[7] = { 0x32, ... };
>      return map[sbus_level];
> then I could just do an array lookup in sun4m-sbus-intr>cpu to make the
> mapping more obvious.

Have you tried Leo Brodie's excellent "Starting Forth" book which is now 
available online? Have a look at the "Initializing an Array" section 
here: http://www.forth.com/starting-forth/sf8/sf8.html.



Mark Cave-Ayland - Senior Technical Architect
PostgreSQL - PostGIS
Sirius Corporation plc - control through freedom
t: +44 870 608 0063

Sirius Labs: http://www.siriusit.co.uk/labs

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