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

Bob Breuer breuerr at mc.net
Sat Aug 20 07:11:41 CEST 2011

Mark Cave-Ayland wrote:
> On 15/08/11 15:28, Bob Breuer wrote:
>> Add an implementation of sbus-intr>cpu for sun4m to map sbus
>> interrupt levels (1 to 7) into cpu interrupts, and make use of
>> it for bpp.  Assumes false is the same as -1.
>> Signed-off-by: Bob Breuer<breuerr at mc.net>
> 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.

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.


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