Implement OF_decode_addr() for arm. Move most of powerpc's implementation into a new function that other platforms can share.

[• ian]

Summary

This creates a new ofw_reg_to_paddr() function (in a new ofw_subr.c file) that contains most of the existing ppc implementation, mostly unchanged.

The ppc code now calls the new MI code from the MD code, then creates a ppc-specific bus_space mapping from the results. The new arm implementation does the same in an arm-specific way.

This also moves the declaration of OF_decode_addr() from ofw_machdep.h to openfirm.h, except on sparc64 which uses a different function signature.

This will allow all FDT platforms to set up early console access using OF_decode_addr().

Test Plan

passed make universe; not run-tested

[nwhitehorn]

This looks good in general (though see inline comment about copyrights). The bus tag assignment (NOT_PCI stuff) seems a little odd to me, but I can't really think of anything better and that API is not baked in by the change.

sys/dev/ofw/ofw_subr.c

3

You should probably retain the copyright from the PPC version here since this is mostly a copy of that implementation.

[• ian]

sys/dev/ofw/ofw_subr.c

3

I investigated that, and it didn't seem to apply. The copyright in the ppc file is unchanged from the initial netbsd import in 2000. The OF_decode_addr() was added by marcel in 2006, and he didn't add himself to the copyright, so copying the block from the ppc file didn't seem right. I could put marcel's name instead of mine at the head of this file, but that feels weird too, somehow. So I figured I'd just mention the provenance in the commit message, mostly so people could follow the chain of history.

[• ian]

Committed as r292555 (forgot to include the link in the commit message).