On Thu, Jun 19, 2008 at 08:01:02PM +0000, Joel Soete wrote:
...
>> We could. But I thought there are cases were we might want to DMA to/from
>> user space directly and that's why Space ID is a parameter.
>
> Ok but it was a BUG if temporary space reg is not 0, so???
It was a BUG in 2.4 kernels since 2.4 didn't have the VM support
to do DMA to/from user space.
I thought 2.6 kernels could DMA to/from user space (related to Direct IO).
> btw system seems to boot too with asm volatile("mtsp
> %%r0,%%sr1":::"memory")
> may be the cpp can catch in the mtsp(gr, cr) macro if gr==0 then I can use
> this insn if not the original macro???
Yes. I like willy's proposed patch for this.
thanks,
grant
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