[haiku-bugs] Re: [Haiku] #5193: [PATCH] openfirmware: Skip mappings to non-physical memory
- From: "bonefish" <trac@xxxxxxxxxxxx>
- Date: Sun, 06 Jun 2010 12:12:49 -0000
#5193: [PATCH] openfirmware: Skip mappings to non-physical memory
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Reporter: andreasf | Owner: axeld
Type: bug | Status: reopened
Priority: normal | Milestone: R1
Component: System/Boot Loader | Version: R1/Development
Resolution: | Keywords:
Platform: PowerPC | Blockedby:
Patch: 1 | Blocking: 1048, 6129
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Comment(by bonefish):
Replying to [comment:13 andreasf]:
> Ha! I've found a way to create areas for the non-RAM ranges, too!
>
> As heuristic I'm using the available memory size.
That only works, when the physical memory is contiguous. The kernel args
contain the actual physical memory ranges.
> For the non-RAM areas a memory type of 0x10000000 is getting set, which
is not supported yet. I'm just ignoring it for now.
The PPC arch_vm_set_memory_type() can be implemented to just return B_OK
(I believe there is no such mechanism as MTRRs for PPC) as soon as memory
types are supported at the paging level (TODO's in
`PPCVMTranslationMap::Map()` and friends; cf. the specs: "Storage Control
Attributes" / WIMG bits).
Note that you should retrieve the actual memory type from the mapped
ranges and pass it to vm_map_physical_memory().
--
Ticket URL: <http://dev.haiku-os.org/ticket/5193#comment:14>
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