Messages in this thread | | | Date | Mon, 27 Dec 2010 19:35:27 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] ACPI: use ioremap_cache() |
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On 12/27/2010 07:21 PM, Shaohua Li wrote: > RCRB is a memory mapped io. In ICH, it's chipset configuration > registers. this range can't be cached. > I thought we should add a check like > if page is E820_RAM or E820_ACPI then > cached_map > else > uncached_map > we have page_is_ram() API which just checks E820_RAM, I thought we can > add a new API to check E820_ACPI.
For x86, that is handled by the MTRRs; for ia64, I would assume ioremap() handles that somehow, otherwise it wouldn't be able to handle existing drivers with ioremap() in them.
-hpa
-- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.
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