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174782 |
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19-Dec-2007 |
marcel |
Redefine bus_space_tag_t on PowerPC from a 32-bit integral to a pointer to struct bus_space. The structure contains function pointers that do the actual bus space access.
The reason for this change is that previously all bus space accesses were little endian (i.e. had an explicit byte-swap for multi-byte accesses), because all busses on Macs are little endian. The upcoming support for Book E, and in particular the E500 core, requires support for big-endian busses because all embedded peripherals are in the native byte-order.
With this change, there's no distinction between I/O port space and memory mapped I/O. PowerPC doesn't have I/O port space. Busses assign tags based on the byte-order only. For that purpose, two global structures exist (bs_be_tag and bs_le_tag), of which the address can be taken to get a valid tag.
Obtained from: Juniper, Semihalf
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145253 |
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18-Apr-2005 |
imp |
Break out the definition of bus_space_{tag,handle}_t and a few other types into _bus.h to help with name space polution from including all of bus.h. In a few days, I'll commit changes to the MI code to take advantage of thse sepration (after I've made sure that these changes don't break anything in the main tree, I've tested in my trees, but you never know...).
Suggested by: bde (in 2002 or 2003 I think) Reviewed in principle by: jhb
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